Page 1 ™ Synco Modular Heating Controller RMH760B including extension modules RMZ782B, RMZ783B, RMZ787 and RMZ789 Basic Documentation Edition 1.0 Controller series B Building Technologies CE1P3133en 05.02.2007 HVAC Products...
Page 2 Siemens Switzerland Ltd © 2007 Siemens Switzerland Ltd Building Technologies Group Subject to alteration HVAC Products Gubelstrasse 22 CH – 6301 Zug Tel. +41 41 724 24 24 Fax +41 41 724 35 22 www.sbt.siemens.com 2/238 Building Technologies Modular Heating Controller RMH760B...
Page 3: Table Of Contents
Contents Summary ...................... 11 Product range ....................11 System topology .................... 12 Equipment combinations ................12 Product documentation.................. 13 Important notes....................14 Operation...................... 15 Operation without operator unit ..............15 Operation with operator unit ................15 2.2.1 Functions of the operator unit................ 15 2.2.2 Operating concept ..................
Page 4 Contrast of display ..................41 Text entries ....................42 4.5.1 Device name and file name ................42 4.5.2 Function block....................42 4.5.3 Texts for the fault inputs.................42 4.5.4 Electronic business card ................42 4.5.5 Resetting text entries ..................43 General functions, fundamentals ...............44 Time switch ....................44 5.1.1 Communication ....................44 5.1.2...
Page 5 6.5.2 2-position control with 2-stage burner ............72 6.5.3 Control of burner’s basic stage and stage 2 ..........72 6.5.4 Control of modulating burners ............... 75 6.5.5 External boiler temperature control ............... 78 Protective boiler functions ................78 6.6.1 Maximum limitation of the boiler temperature..........79 6.6.2 Minimum limitation of the boiler temperature..........
Page 6 8.6.1 General ......................103 8.6.2 Load control ....................103 Setpoint increase ..................103 Limit and protective functions ..............104 8.8.1 Frost protection ....................104 8.8.2 Limitations....................104 8.8.3 Limitation of the return temperature.............105 8.8.4 Pulse limitation.....................107 8.8.5 Pump overrun and mixing valve overrun .............108 8.8.6 Pump kick and valve kick................108 Text designation...................108 8.10 Fault handling ....................108...
Page 7 9.7.3 Quick setback and boost heating ..............133 Limit and protective functions ..............134 9.8.1 Maximum limitation of the room temperature ..........134 9.8.2 Limitation of the return temperature ............135 9.8.3 Minimum limitation of the return temperature ..........137 9.8.4 Frost functions and general protective functions .........
Page 8 10.6.2 Sequence of legionella function ..............166 10.6.3 Legionella function relay ................168 10.7 Primary control.....................168 10.7.1 Primary temperature setpoint...............169 10.7.2 Load control ....................170 10.8 Limitation and protective functions...............170 10.8.1 DHW discharging protection ................170 10.8.2 Limitation of the return temperature.............171 10.8.3 Frost protection functions................172 10.8.4 Pulse limitation.....................172 10.8.5...
Page 9 12.6 Diagnostic choices..................193 Function block faults ................194 13.1 Overview of function block................194 13.2 Configuration ....................194 13.3 Fault button....................195 13.4 External fault button..................195 13.5 Fault properties.................... 195 13.5.1 Acknowledgement and reset ............... 195 13.5.2 Signal priority....................196 13.5.3 Plant behavior....................
Page 10 16.1.4 Examples .....................221 16.2 Editable text ....................230 16.2.1 Heating circuits ....................230 16.2.2 DHW ......................230 16.2.3 Primary controller..................230 16.2.4 Main controller .....................230 16.2.5 Boiler......................230 16.2.6 Faults ......................231 16.2.7 Meters ......................231 16.2.8 Device ......................231 10/238 Building Technologies Modular Heating Controller RMH760B CE1P3133en HVAC Products Contents 05.02.2007...
Page 11: Summary
Summary Product range Type of unit Name Type refer- ence Controller Heating controller RMH760B Extension modules Heating circuit module RMZ782B DHW module RMZ783B Universal module RMZ787 Universal module RMZ789 Module connector For detached extension modules RMZ780 Operator units Operator unit, plug-in type RMZ790 Operator unit, detached RMZ791...
Page 12: System Topology
System topology QAW740 RXB… Konnex TP1 RMZ790 RMZ791 RMU7… RM… RMH760B OCI700.1 Equipment combinations Type of unit Type reference Data Sheet no. Passive sensors All types of QA… sensors with a sensing ele- N1713 and ment LG-Ni 1000 N1721…N1846 Outside sensors QAC22 with a sensing element LG-Ni 1000 N1811 QAC32 with a sensing element NTC 575...
Page 13: Product Documentation
Operating Instructions for heating controller RMH760B-5 sr, hr, sl, ro, el, tr B3133x5 Basic Documentation "Communication with Konnex bus" P3127 Declaration of CE Conformity, Synco 700 T3110 Environmental Declaration for controllers RMH760B, RMU710…730 E3110…01 Environmental Declaration for extension modules RMZ78…...
Page 14: Important Notes
Important notes This symbol shall draw your attention to special safety notes and warnings. If such notes are not observed, personal injury and / or considerable damage to property can occur. Synco™ 700 products may only be used for the control and supervision of heating, Field of use ventilation, air conditioning and chilled water plant.
Page 15: Operation
Operation Synco™ 700 devices may only be operated by staff who have been instructed by SBT HVAC Products or their delegates and whose attention has been drawn to potential risks. Operation without operator unit Without operator unit, the following operating elements on the controller and extension module can be used: Controller Extension module...
Page 16: Operating Concept
2.2.2 Operating concept On the software side, all setting and readout values are arranged as datapoints of the General menu tree. Using the operating elements, every datapoint can be selected, displayed or set. All menus appear on the LCD as clear text. The controller has several languages preprogrammed;...
Page 17: Operating Levels
Setting level, pop-up, setting a numerical value: Entry 1 Start ––.––.–– ––.–– 25.02 ––.––.–– ––.–– Reason Holidays Delete entry Setting level, Help picture ”Explanations relating to the selected datapoint”. In the corner at bottom right, the text identification number of the menu tree appears (only service level and password level): Main me>...
Page 18 Level Access Symbol Service level Press simultaneously the OK knob and the ESC button; then, select Service level and confirm by (for the service engineer) pressing the OK knob Password level Commissioning: (for the heating Press simultaneously the OK knob and the ESC engineer) button;...
Page 19: Commissioning
Commissioning Preparations for using and commissioning the Synco™ 700 controllers must be made by qualified staff who have been appropriately trained by SBT HVAC Products. Entering the commissioning mode During commissioning, both control and the plant’s safety functions remain deactivated! The relays are deenergized, which means that their normally open contacts are open.
Page 20 Basic type H With basic type H, no configuration is predefined. The plant type is to be selected if the subject plant differs considerably from the preconfigured plant types, so that the effort required for an adaptation would be greater than the effort required for manual configu- ration.
Page 21 Plant types Plant type Description Plant diagram No preconfigured inputs and outputs Basic type DHW circuit with controlled mixing H0-1 H0-1 valve in the storage tank flow and N.X2 charging pump, connected directly N.X1 N.Q4 to uncontrolled main flow (DHW N.Q1/Q2 type DHW 2) Weather-compensated heating...
Page 22 Plant type Description Plant diagram Main controller (district heat H1-0 H1-0 connection with heat exchanger), control of secondary flow tempera- ture with 2-port valve in the pri- N.X1 mary return, supply to internal and external consumers N.X3 N.Q1/Q2 Main controller H1-1 H1-1 A3.X4...
Page 23 Plant type Description Plant diagram Primary controller H2-1 H2-1 N.X1 DHW circuit with controlled mixing A3.X2 A3.X1 N.Q3 valve in the storage tank flow and A3.Q5 N.Q1/Q2 charging pump (DHW 2) A3.Q1/Q2 Primary controller H2-2 H2-2 N.X2 N.X1 A2.X1 Weather-compensated heating N.Q3 A2.Q3 circuit control with mixing valve...
Page 24 Plant type Description Plant diagram Boiler temperature control H3-2 H3-2 N.X2 A2.X1 Weather-compensated heating N.X1 A2.Q3 circuit control with mixing valve N.Q3 A2.Q1/Q2 and circulating pump N.X3 N.Q5 Boiler temperature control H3-3 H3-3 N.X2 A2.X1 DHW circuit (DHW 2) N.X1 A3.X2 A3.X1 A2.Q3...
Page 25 Plant type Description Plant diagram Boiler temperature control H4-3 H4-3 N.X2 A2.X1 DHW circuit (DHW 2) N.X1 A3.X2 A3.X1 A2.Q3 A3.Q5 Heating circuit N.Q3 A2.Q1/Q2 N.X3 A3.Q1/Q2 N.Q5 N.Q1/Q2 Boiler temperature control H4-4 H4-4 N.X2 A2.X1 A2.X1 N.X1 Heating circuit A2(1): A2.Q3 A2.Q3...
Page 26 Plant type Description Plant diagram Heating circuit H5-6 H5-6 N.X2 N.X1 A2.X1 A2.X1 Heating circuit A2(1): N.Q3 A2.Q3 A2.Q3 Heating circuit A2(2): N.X3 A2.X3 A2.X3 N.Q1/Q2 A2.Q1/Q2 A2.Q1/Q2 A2(1) A2(2) DHW circuit (DHW 3) H5-7 H5-7 N.X2 A3.X4 N.X1 A2.X1 A2.X1 Heating circuit A3.X2...
Page 27 When selecting the plant type, the sensors required for the basic functions and stan- Sensor assignment dard outputs will automatically be predefined and, for this reason, need not be config- ured. Every plant type has several plant components preconfigured. The following summary Preconfiguration of plant shows the assignment of the plant components to the connection terminals.
Page 28: Terminal Assignment And Properties Of Outputs
3.2.2 Terminal assignment and properties of outputs In principle, all input and output terminals can be freely used. The terminals preas- signed when selecting the plant type can also be reconfigured. In that case, however, the special properties of the individual extension modules, and their outputs, must be taken into consideration.
Page 29: Short Designations For Basic Module And Extension Modules
3.2.3 Short designations for basic module and extension modules The following short designations are used for the basic module and the extension modules: Short designa- Type of module tion Basic module RMH760B Extension module RMZ782B A2(1) First of 2 extension modules RMZ782B A2(2) Second of 2 extension modules RMZ782B Extension module RMZ783B...
Page 30 Configuration diagram for plant type H4-5 Configuration Diagram Maximum configuration: RMH760B 4 Extension modules Capital letter = Physical in- or output Small letter = internal signal To do a configuration = Or-selection = Time switch 1) 6 Single or twin pumps = And-selection X = Universal input x = Analog or digital...
Page 31: Extension Modules
• “N.“ in the tables denotes “controller“ Notes • If required, additional inputs and outputs (e.g. flue gas temperature sensor, operating mode relay, circulating pump) can be assigned to the free inputs and outputs via “Ex- tra configuration” • The inputs and outputs can be checked with the help of menu Extra configuration > … > Inputs (or Outputs) •...
Page 32 When selecting the plant type, an extension module will automatically be preconfigured, if required. This can be changed in the basic configuration. The assignment of functions to the basic module and the extension modules is not Assignment of prescribed. Relay outputs for 3-position applications are preconfigured to the controller functions or the extension module type RMZ782B or RMZ783B.
Page 33: Extra Configuration
Position 1 When using Position 1 in this example, extension module RMZ782B is selected. Position 2 Then, at position 2, module type RMZ787 is selected. Positions 3 and 4 Positions 3 and 4 remain blank. They use setting “---“ and are confirmed with the OK knob, which means that they are left blank.
Page 34: Configuration Of The Universal Inputs And Outputs
The inputs of the basic module will be termed RMH760.Xn, those of the extension modules RMZ… . If 2 identical extension modules are available, they will be termed RMZ782(1) and RMZ782(2). After the assignment, following appears: Flue gas temperature sensor N.X4 (N = short designation of basic module RMH760B).
Page 35 Setting Main menu > Commissioning > Settings > … or Main menu > Settings > Inputs > …X… Operating line Range Factory setting Type reference Ni 1000 / 2 × Ni 1000 / Ni 1000 T1 / Pt 1000 / DC 0…10 V / NTC 575* * For outside temperature only Measuring range...
Page 36: Wiring Test
Operating line Adjustable values / display / remarks Display input 2 Digital Display input 3 Digital Display input 4 Digital The input identifier can only be set for the configured inputs (display inputs and fault inputs). Fault inputs can also be configured to terminals that are already used. In that case, the automatically set input identifier is always given priority.
Page 37: Completing Commissioning
Main menu > Commissioning > Wiring test > Heating circuit 1 (or 2 or 3) > Outputs Operating line Positions Heating circuit pump Off / On Completing commissioning If the application is valid, the Commissioning menu can be quit as follows: Press the ESC button.
Page 38: Device Information
Device information The Device information menu provides information about the controller, shows the soft- ware version, etc. Main menu > Device information > Controller Display values Operating line Adjustable values / display / remarks Plant type Display of plant type Plant type adapted Display of intervention in the programmed application (yes, no)
Page 39: General Settings
General settings Time of day and date 4.1.1 Operating principle The controller has a yearly clock with time of day, weekday and date. The following time formats are available: Time format Time Date Example Time of day Example format 24 hours dd.mm.yyyy 31.05.2006 hh:mm...
Page 40: Fault Handling
Setting values Main menu > Commissioning > Communication > Basic settings Operating line Range Factory setting Clock time operation Autonomous / slave / Autonomous master Remote setting clock slave Yes / No If the controller is set as a clock time slave, it can also be selected whether it shall be possible to adjust the master clock’s time of day from this controller.
Page 41: Selecting The Language
Fault status messages Number Text Effect 5001 System time failure Nonurgent message; must not be ac- knowledged 5002 >1 clock time master Nonurgent message; must be acknowl- edged 5003 Invalid time of day Nonurgent message; must not be ac- knowledged Selecting the language Every RMH760B controller has a number of languages loaded.
Page 42: Text Entries
Text entries 4.5.1 Device name and file name The text for the device name appears in the welcome picture. Setting Main menu > Commissioning > Settings > … or Main menu > Settings > Texts Operating line Range Factory setting Device name Max.
Page 43: Resetting Text Entries
Configuration Main menu > Commissioning > Extra configuration > Miscellaneous > Business card Operating line Range Factory setting Business card Yes / No Main menu > Commissioning > Settings > … or Main menu > Settings > Texts Operating line Range Factory setting Business card line 1...
Page 44: General Functions, Fundamentals
General functions, fundamentals Time switch For each of the 3 heating circuits, DHW heating and the DHW circulating pump, there is a time switch available. In “Automatic“ mode, the respective function block operates according to this time switch. A switching program can be defined for every weekday. Using the program entered, the time switch controls the change of operating modes and the relevant setpoints.
Page 45: Entries
Main menu > Commissioning > Communication > Heating circuit 1 (or 2 or 3) Operating line Range Factory setting Geographical zone (apartm.) ---- / 1…126 ---- Time switch slave (apartm.) ---- / 1…126 ---- Main menu > Commissioning > Communication > DHW Operating line Range Factory setting...
Page 46: Fault Handling
For the circulating pump, a specific 24-hour program can be selected for each day: Circulating pump Main menu > DHW > Circ pump time switch Operating line Range Factory setting Monday Off / On From 05:00 On From 22:00 Off up to Sunday Off / On...
Page 47: Holidays And Special Days
Number Text Effect 5302 >1 DHW time switch Nonurgent message; must be acknowl- edged For each geographical zone, only one time switch master may be set. If several control- lers are parameterized as masters, a fault status message will be delivered. The fault is identified by the time switch master(A) when it receives a time switch signal from some other master(B) in its own zone.
Page 48: Holidays
Entry Effect Diagram Slave The holidays / special day program of this heating circuit or of DHW is not active; a holidays / special day program selected on the slave will be ignored. Active is some other holidays / special day program assigned to the same holidays / special day zone.
Page 49: Special Days
Settings Main menu > Heating circuit 1 (or 2 or 3) > Room operating mode Operating line Range Factory setting Room operating mode holidays Economy Economy Protection Main menu > DHW > DHW optg mode Operating line Range Factory setting DHW operating mode holidays Auto Protection...
Page 50: Fault Handling
Main menu > Commissioning > Extra configuration > Heating circuit 1 (or 2 or 3) > Inputs Setting Main menu > Commissioning > Extra configuration > DHW > Inputs Operating line Range Factory setting Special day input --- / RMH760… etc.* Holiday input --- / RMH760…...
Page 51: Frost Protection For The Plant
Number Text Effect 5212 >1 hol/sp day prgm HC 2 Nonurgent message; must be acknowl- edged 5222 >1 hol/sp day prgm HC 3 Nonurgent message; must be acknowl- edged 5232 >1 hol/sp day prgm DHW Nonurgent message; must be acknowl- edged When evaluating the priority in the holidays / special day program, only the first 2 entries are taken into consideration.
Page 52: Pump Overrun And Mixing Valve Overrun
Sequence of functions The sequence of frost protection for the plant is as follows: ON/OFF <–5 °C (TO -4…+2 °C >2 °C (TO Continuously On for 10 minutes every 6 hours Continuously off Pump ON / OFF Status Adjustable are the following temperatures: •...
Page 53: Pump Kick And Valve Kick
Pump kick and valve kick Main menu > Commissioning > Settings > … or Main menu > Settings > Protective functions Operating line Range Factory setting Kick day Monday…Sunday Monday Kick time 00:00…23:59 10:00 Pump/valve kick --- / Pump + Valve / Pump + valve Pump / Valve The pump kick or valve kick is a protective function that is carried out periodically.
Page 54: Load Control
Example 1: Heat source and heat consumer Heat Heat consumer source Heat Heat demand consumer Load control Example 2: Heat source, primary controller and heat consumer Heat consumer / Heat primary controller source Heat Heat consumer consumer Heat Heat consumer consumer The heat demand signals can be assigned a priority.
Page 55 ⇒ Load reduction via critical or uncritical locking signals The type of locking signals to be generated can be parameterized • Shifting DHW priority (if the boiler temperature setpoint is not reached during DHW heating, the amount of heat drawn by the heating circuits will be restricted): ⇒...
Page 56: Mixing Valve Control
If some other heat consumer without absolute priority is in the same heat distribution zone, its value will be ignored, even if it is greater. Generally, the function of absolute DHW priority in combination with heating circuits does not pose any problems; nevertheless, the correct plant function must always be kept in mind.
Page 57 Valve position Valve position must Δ change rapidly (manually) Actual value Δ Delay time Compensating time Δx Change of actual value ΔY Change of valve position The longer the delay time in relation to the system time constant, the more difficult the control of the system.
Page 58 The flow temperature fluctuates about the Setpoint setpoint Flow temp. Open pulse Close pulse Open pulse Close pulse A The control pulses are too long: Measure the effective valve running time (0…100 % stroke) and enter it. If the pulses are still too long, increase P-band Xp B Several successive relatively short on or off pulses: Increase integral action time Tn Flow temperature ap-...
Page 59: Control Signal
• The control action is too slow. Decrease P-band Xp in steps of about 25 % • The control action is too fast. Increase P-band Xp in steps of about 25 % The integral action time Tn is indicated in seconds and amounts to about 3 × Tu (also Integral action time Tn refer to ”Setting rules”...
Page 60: Changeover Logic
Outputs Main menu > Commissioning > Extra configuration > Heating circuit 1 (or 2 or 3) > Outputs Main menu > Commissioning > Extra configuration > DHW > Outputs Main menu > Commissioning > Extra configuration > Primary controller > Outputs Main menu >...
Page 61 The changeover time used is the same time as that used for the pump / mixing valve Changeover time kick (kick day and kick time). Main menu > Commissioning > Settings > … or Main menu > Settings > Protective functions Operating line Range Factory setting...
Page 62: Overload Message And Supervision Of Flow
5.8.2 Overload message and supervision of flow As with every digital input, the normal position can also be parameterized for the pump fault inputs and the flow input (… > Settings > Inputs > RM… (controller or module type) > Normal position).
Page 63: Boiler Temperature Control
Boiler temperature control Overview of function block d d d Pump funct: Boilerp. Bypassp. Boiler Stage MBRT Modulating 1. 2. Block diagram TRtBo ReleaseBo InFgMsm BoCtrl BoPuEr BoPuEr_B BoPuErFlow Error ErBu BuFb Er1 (WloLeDet) BuSt1 BuSt2 Er2 (PMaxMon) BuMdlt Er3 (PMinMon) BoSetpt BoPu ShOffVlvFb...
Page 64: Configuration
Boiler diagram PMaxMon(Er2) WLoLeDet(Er1) BuSt1 BuFb BuSt2 BuMdlt ErBu BoSetpt TRtBo BoPuErFlow BoPu BoPuEr BoPu_B BoPuEr_B PMinMon(Er3) VlvShOffFb VlvShOff VlvRtMx BoPu Boiler pump BoPu_B Boiler pump B Fault input boiler pump BoPuEr BoPuEr_B Fault input boiler pump B BoPuErFlow Flow supervision boiler pump BoSetpt Boiler temperature setpoint DC 0…10 V BuFb...
Page 65 Inputs Main menu > Commissioning > Extra configuration > Boiler > Inputs Operating line Adjustable values / display / remarks Boiler sensor Return sensor Release input Checkback signal burner Fault burner Flue gas temperature sensor Flue gas meas mode contact [Boiler pump] overload [Boiler pump B] overload Flow signal pump...
Page 66: Burner Types
If no checkback signal is received, an appropriate fault status message will be deliv- Checkback signal shut- ered. In addition, the burner will be started only if the shutoff valve's checkback signal off valve indicates a fully open valve. If no checkback signal is received, an appropriate fault status message will be deliv- ered.
Page 67: Boiler Hydraulics
6.2.2 Boiler hydraulics Boiler temperature sensor Plant types H3-x BoPu TRtBo Return temperature sensor (optional, for minimum limi- tation) ByPu BoPu Boiler pump TRtBo TRtBo ByPu Bypass pump Boiler pump in the flow Boiler pump in the bypass For plant types with boiler (H3-x and H4-x), a boiler pump is always configured. This boiler pump can also be operated parallel to the boiler, or it can be configured as a boiler bypass pump.
Page 68 In most cases, the boiler can be hydraulically decoupled via a shutoff valve. In the case of plant with a mixing valve for minimum limitation for the return temperature, this function is performed by the mixing valve. If the boiler is not released, the mixing valve is driven to the fully closed position so that the boiler will be hydraulically decoupled from the plant.
Page 69: Boiler Operating Modes And Boiler Setpoints
Depending on the type of hydraulic system used, this may not be required (e.g. bypass pump). DC 0…10 V output for a DC 0…10 V mixing valve actuator. Maintained boiler return temperature, continu- ously For more detailed information, refer to subsection 6.6.11 “Maximum limitation of the boiler temperature”.
Page 70: Releasing And Locking A Boiler
Releasing and locking a boiler A boiler can be released or locked either via the digital input (release input) or operation Manual switch (boiler operating mode). Main menu > Commissioning > Settings > … or Main menu > Boiler > Boiler operating mode Operating line Range Factory setting...
Page 71: 2-Position Control With 1-Stage Burner
During test mode, fault status message Boiler test operation active is displayed. It is maintained until preselection “Test mode“ is set back to “Auto“. This is to make certain that the plant will not be quit without ending the test mode. In the “Auto“...
Page 72: 2-Position Control With 2-Stage Burner
If the switch-off point is reached before the minimum burner running time has elapsed, Minimum burner running the burner will continue to operate until that time is completed (burner cycling protec- time, burner cycling tion). The minimum burner running time is given priority. protection The burner’s switch-off point will be raised by half the boiler’s switching differential.
Page 73 The release logic for 2-stage operation aims at ensuring an optimum switch-on time for Burner stage 2 stage 2 which, in addition to a time criterion, also considers the amount of heat deficit, calculated with a temperature-time integral. Time criterion As soon as the burner’s basic stage is switched on, the minimum locking time for burner stage 2 starts to run.
Page 74 °C TBuOffPt TBoSetpt TBuOnPt reset Reset integral Actual value of the boiler temperature TBoSetpt Boiler temperature setpoint Time Time to reset TBuOffPt Burner’s switch-off temperature reset TBuOnPt Burner’s switch-on temperature Through the generation of the temperature-time integral it is not only the period of time that is considered, but also the extent of overshoot.
Page 75: Control Of Modulating Burners
6.5.4 Control of modulating burners Main menu > Commissioning > Settings > … or Main menu > Settings > Boiler > Burner modulating Operating line Range Factory setting Actuator run time 1…600 s 60 s P-band Xp 1…200 K 20 K Integral action time Tn 0…600 s 150 s...
Page 76 damper actuator will be driven to the start position so that only the basic stage will be used for heating. Deactivation or locking of modulation occurs at the same moment in time as the change from the basic stage to cycling operation. If not yet done, the controller will again drive the damper actuator to the fully closed position.
Page 77 The proportional band has an impact on the controller’s P-characteristic. Proportional band (Xp) With a setpoint / actual value deviation of 20 K, a setting of Xp = 20 K produces a manipulated variable corresponding to the damper actuator’s running time. The integral action time has an impact on the controller’s I-characteristic.
Page 78: External Boiler Temperature Control
If the control system’s response is too prompt so that significant overshoot or even Control action is permanent oscillations occur, setting parameters Xp, Tn and Tv must be increased in too fast steps. A new readjustment should be made only after the control action resulting from the previous readjustment is completed.
Page 79: Maximum Limitation Of The Boiler Temperature
6.6.1 Maximum limitation of the boiler temperature This setting is used to provide maximum limitation of the boiler temperature setpoint. For control of the burner, this value represents the switch-off point. In this range, the boiler’s switching differential downward is calculated. Maximum limitation of the boiler temperature is always active.
Page 80: Protection Against Boiler Overtemperatures
TBoMin TBoMin Burner Burner swich-on swich-on command command Optimization of minimum boiler Optimization of minimum boiler tem- temperature On perature Off 6.6.4 Protection against boiler overtemperatures To protect the boiler against overtemperatures on burner shutdown because, possibly, none of the heat consumers draws heat, a consumer overrun time can be set. Main menu >...
Page 81: Boiler Shutdown
Main menu > Commissioning > Settings > … or Main menu > Settings > Boiler > Limitations Operating line Range Factory setting Protective boiler startup On / Off To prevent the boiler temperature from staying below that minimum level for unneces- sary lengths of time, the amount of heat drawn by DHW heating and the heating circuits can be restricted until the boiler temperature has again risen above the minimum limit value.
Page 82: Frost Protection For The Boiler
6.6.10 Frost protection for the boiler The boiler temperature is monitored to ensure frost protection for the boiler. If the boiler temperature drops below 5 °C, the burner will be switched on. When the boiler temperature returns to a level above TBoMin + SD (minimum boiler temperature plus switching differential), the burner will be shut down.
Page 83 ByPu TRtBo The bypass pump can be controlled either according to the acquired return temperature or, when there is no sensor, parallel to burner operation. Normally, the return temperature sensor is installed upstream of the bypass pump (on the consumer side) to avoid too frequent switching of the bypass pump. Main menu >...
Page 84: Protection Against Pressure Shocks
MnPu TRtBo VlvShOff BoPu VlvRtMx The 3-port mixing valve ensures both protective boiler startup and maintained boiler return temperature. The main pump can also be configured, in addition to the boiler pump. In that case, it must be made certain that the main pump will not operate when the mixing valve is fully closed.
Page 85: Flue Gas Temperature Supervision
Flue gas temperature supervision Flue gas temperature supervision offers: • Display of the current flue gas temperature • Display of the maximum flue gas temperature acquired after a selected point in time • Supervision of the flue gas temperature limit including alarm should the limit value be exceeded An appropriate sensor must always be configured, independent of usage.
Page 86: Flue Gas Measuring Mode
Flue gas measuring mode Flue gas measuring mode can be triggered either via a digital input ( …Inputs > Flue gas measuring mode ) or operation. Main menu > Boiler > Flue gas measuring mode Operating line Range Factory setting Preselection Off / On Flue gas meas mode contact...
Page 87 Fault shutoff valve If there is no checkback signal from the shutoff valve, the boiler is considered faulty also. The waiting time for the checkback signal can be adjusted. If there is no check- back signal on completion of the waiting time, a fault will be signaled. Maximum flue gas tem- It can be selected whether or not flue gas temperatures above the maximum permissi- perature...
Page 88: Burner Hours Run Counter And Burner Start Counter
Main menu > Commissioning > Settings > … or Main menu > Settings > Boiler > Fault settings > Fault input 2 Operating line Range Factory setting Fault settings Overpressure Max. 20 characters Impact of fault Stop No stop / Stop Fault acknowledgement None / Acknowledge / Acknowledge...
Page 89: Fault Handling
6.11 Fault handling Sensor error Number Text Effect Urgent message; must be acknowledged. Boiler sensor error No boiler stop; the burner is shut down Nonurgent message; must be acknowl- Boiler return sensor error edged. No boiler stop In the case of plant with mixing valve for the maintained boiler return temperature, the mixing valve will be driven to the fully closed position when the return tempera-...
Page 90: Text For Boiler Designation
Number Text Effect [Boiler pump] no flow Nonurgent message; must be acknowl- 2411 edged and reset. No boiler stop 2421 [Boiler pump B] overload Nonurgent message. Acknowledgement can be parameterized. Factory setting: “Acknowledge and reset“. No boiler stop [Main pump B] no flow Nonurgent message;...
Page 91 Main menu Outputs > Boiler > Outputs Operating line Adjustable values / display / remarks Burner stage 1 Burner stage 2 Signal modulating burner Setpoint compensation Boiler pump Boiler pump B Shutoff valve Mix valve pos maint return temp Main menu >...
Page 92: Heat Demand And Heat Requests
Heat demand and heat requests Heat requests The following sources can deliver heat requests to the controller: • The internal heating circuit • The internal DHW circuit • External controllers via the Konnex bus • As a continuous DC 0…10 V signal •...
Page 93: Heat Demand Outputs
Heat request heating circuits Heat request DHW Heat request primary controller Primary controller Heat request DC 0...10 V Heat request heating curve Main flow maximum setpoint Heat request contact DHW Main controller Heat request contact frost protection Setpoint Heat request air handling boost Heat demand Heat request individual...
Page 94: Heat Demand Transformer
Operating line Range Factory setting Limit value heat demand ON 0…140 °C 20 °C Limit value heat demand OFF 0…140 °C 15 °C Both outputs are always available, even if no main controller has been configured. • If only a boiler is configured, the requests received will be forwarded to the boiler •...
Page 95 To ensure that minimum opening travel of the valve will not generate a demand for heat, a switch-on or switch-off threshold can be defined. The factory settings are as follows: • A demand for heat will be calculated only when the valve positions are >10 % •...
Page 96 Setting the limit value The “On range“ and the “Off range“ depend on the settings made: request Limit value request off Limit value request on OFF…100 Setting range for limit value request On (example with OFF = 30 %) 0… ON Setting range for limit value request Off (example with ON = 45 %) 96/238 Building Technologies...
Page 97: Main Controller And Primary Controller
Main controller and primary controller Overview of function block a d d d a d d d Heat requis. Main controller Primary controller Main System Heat demand pump pump In terms of control principle, both function blocks are primary controllers. For this rea- son, the term “primary controller“...
Page 98: Controller Types
Outputs Main menu > Commissioning > Extra configuration > Main controller > Outputs Main menu > Commissioning > Extra configuration > Primary controller > Outputs Operating line Adjustable values / display / remarks Mixing valve 3-pos Mixing valve modulating Main pump Only with main controller Main pump B Only with main controller...
Page 99: Mixing Valve Control
The flow or return temperature sensor of primary controller type 2 can be used for display purposes. By configuring the outputs, it is determined whether primary controller type 1 or 2 is used. Without configuration of a mixing valve, primary controller type 2 is automatically used. But a flow temperature increase can also be defined with primary controller type 2 to compensate for temperature losses in the case of long pipes.
Page 100: Heat Demand And Heat Request
Operating line Range Factory setting Frost protection for the plant / Overtemp protec- tion/overrun / Plant operation selector / No request * Frost protection functions ensured ** Only with main controller Preselection (plant opera- The primary controller can be switched off for service purposes. The valve will close tion selector) and the pump will be deactivated, or valve and pump start their overrun.
Page 101: Heat Request Modulating
A heat demand transformer converts the last 3 types of signal into a flow temperature setpoint. In addition, an analog input and up to 3 digital inputs as heat request inputs can be configured on the main controller and on the primary controller. These are always available at the main controller, even if no main controller plant element has been configured.
Page 102: Heat Request 2-Position
8.5.2 Heat request 2-position Main menu > Commissioning > Settings > … or Settings Main menu > Settings > Main controller > Heat request Main menu > Settings > Primary controller > Heat request Operating line Range Factory setting [2-pos] setpoint DHW 5…140 °C 70 °C [2-pos] priority DHW...
Page 103: Heat Demand Transformers
8.5.4 Heat demand transformers The heat demand transformers described in chapter 7 “Heat demand and heat re- quests”. Mixing valve control 8.6.1 General Load control The heat output for mixing valve control can be reduced by functions of higher priority (e.g.
Page 104: Limit And Protective Functions
Primary controller Main menu > Commissioning > Settings > … Main menu > Settings > Primary controller > Primary controller Operating line Range Factory setting Setpoint increase 0…50 K 10 K Limit and protective functions 8.8.1 Frost protection Here, the setting is made whether or not “Frost protection for the plant” shall act on the Frost protection for pump for precontrol.
Page 105: Limitation Of The Return Temperature
Limitations of the return Refer to subsection 8.8.3 “Limitation of the return temperature”. temperature Response of main pump The respective setting determines whether or not the main pump or the system pump / system pump in the shall respond to locking signals: event of locking signals Setting Effect when a locking signal occurs...
Page 106 If the return temperature exceeds the limit value, the primary controller’s flow tempera- Maximum limitation of ture setpoint will be lowered. If the return temperature drops below the limit value, the return temperature reduction of the flow temperature setpoint will be negated again. Limitation is provided in the form of an I-controller whose integral action time can be adjusted.
Page 107: Pulse Limitation
This limitation too will be activated only when a valid value has been set. If the value is invalid (entry of “----“), there will be no limitation. This limitation is effective when the legionella function of a DHW circuit is active at the Maximum limitation in primary controller.
Page 108: Pump Overrun And Mixing Valve Overrun
8.8.5 Pump overrun and mixing valve overrun To protect the boiler against overtemperatures after the burner has shut down (when there are no more active heat consumers), an overrun time for the consumers can be set on the boiler controller. After the burner has shut down, the overrun time ensures that the heating circuits and DHW heating will draw heat for that period of time, provided they were consuming heat up to one minute before the burner was shut down.
Page 109: Diagnostic Choices
Number Text Effect Main contr return sens Nonurgent message; must be acknowl- error edged Main controller and primary controller behave as if no return temperature sensor was present. Limitation of the return temperature is inactive. Error in connection with Number Text Effect heat requests...
Page 110 Operating line Range [Main pump] overload* 0 / 1 (1 = overload) [Main pump B] overload* 0 / 1 (1 = overload) [System pump] overload** 0 / 1 (1 = overload) [System pump B] overload** 0 / 1 (1 = overload) Flow signal pump * Only with main controller ** Only with primary controller...
Page 111: Heating Circuit Control
Heating circuit control Overview of function block a a a a Heating circuit 3 pump Timer function Special day input Holiday input Heating circuit diagram HCtrVlvMx TFlHCtr HCtrPu HCtrPu_B TRtHCtr HctrPu Heating circuit pump HctrPu_B Heating circuit pump B HCtrVlvMx Heating circuit mixing valve TFlHCtr Flow temperature sensor Outside sensor...
Page 112 The heating circuit can be configured to any type of module. If the RMZ782B is re- placed by some other module, all settings using type reference RMZ782B… via “Extra configuration“ must be reconfigured. Function blocks can always be activated via “Extra configuration“, independent of the Extra configuration type of plant.
Page 113: 3-Position Or Modulating Mixing Valve
Operating line Adjustable values / display / remarks Heating limit relay Operating mode relay 1 Operating mode relay 2 * Outside temperature relay: Only heating circuits 2 and 3 have their own outside temperature. Heating circuit 1 shares the outside tem- perature with other function blocks in the controller.
Page 114 Preselection Auto Factory setting. The room operating mode changes automati- cally according to the time program Comfort The room is constantly maintained at the Comfort setpoint. This operating mode is selected when the room is constantly occu- pied Precomfort The room is constantly maintained at the Precomfort setpoint. This operating mode is selected when occupancy of the room can be expected Economy...
Page 115: User Request In The Room
Time switch In preselected room operating mode , the time switch changes the room operat- ing mode or the room temperature setpoint in accordance with the program entered. During holidays, a fixed preselected setpoint is used: Main menu > Heating circuit 1 (or 2 or 3 ) > Room operating mode Operating mode during holidays Operating line...
Page 116: Timer Function
Heating limit with prese- If Comfort mode is preselected via the room operating mode contact, the heating limit lected Comfort mode can be activated with these settings. If, in accordance with the time program, Comfort mode is active, the heating limit always applies, independent of this setting.
Page 117 Application example Forwarding the resulting room operating mode from the Qx relay outputs of the RMH760B to a Synco™200 controller: RMH760B Synco™200 RLU2… Main menu > Commissioning > Extra configuration > Heating circuit 1 (or 2 or 3 ) > Outputs Configuration of both operating mode relays Operating line...
Page 118: Plant Operation
9.3.6 Plant operation Plant operation indicates whether the heating circuit is switched on and whether the pump operates. Plant operation Main menu > Heating circuit 1 (or 2 or 3 ) > Plant operation Operating line Range Factory setting Preselection Auto / Off* Auto State...
Page 119 Operating on the controller, Interventions or room unit, or via bus via digital inputs Settings 24-hour program, Cmf, Pcf, Eco, Prt Holiday On, Off holiday/special day program contact On, Off Special day Special day, holidays Settings calendar contact Calendar Switching program Resulting operating mode Timer button Time program Cmf, Pcf, Eco, Prt...
Page 120: Room Temperature Setpoints
Priority Name Explanation Presence button and The current time program can be overridden by timer button presence button or timer button The timer button at digital input (or of a 3-party Konnex device) can also override the room operat- ing mode. If 2 or more functions are triggered, the function activated last will prevail Special day contact...
Page 121: Raising The Economy Setpoint
Display of inputs and The effective setpoint appears on the Main menu and on the info page. setpoints Main menu > Heating circuit 1 (or 2 or 3 ) > Inputs/setpoints Operating line Adjustable values / display / remarks Current room temp setpoint …°C Room setpoint absolute* …°C...
Page 122 The figure at the top shows the difference between the remote setpoint adjuster and the adjusted Comfort setpoint for heating. This difference impacts the other setpoints very differently. This is shown in the figure at the bottom. +10 K Setpt C H Cmf -10 K z.B.
Page 123: Room Temperature Setpoint Adjuster, Relative
The Economy setpoints are shifted only if, otherwise, the Precomfort setpoints would Impact on the lie outside the Economy setpoints. Also refer to the graph above. Economy setpoint The input is to be activated via “Extra configuration“: Extra configuration Main menu > Commissioning > Extra configuration > Heating circuit 1 (or 2 or 3 ) > Inputs > Room setpoint adjuster abs Assign terminal Main menu >...
Page 124: The Composite And The Attenuated Outside Temperature
Attenuated outside To determine the heating limit (summer / winter operation), the attenuated outside temperature temperature is also required (see below). The heating curve is determined by the 2 curvepoints at the design temperature and Heating curve the theoretical heating limit. Heat transmission in the space is not linear, however. When there is a small differential between flow temperature and room temperature, the ability of heat transmission decreases.
Page 125: Heating Curve
TOstrDmp TOeff Main menu > Commissioning > Settings > … or Settings Main menu > Settings > Heating circuit 1 (or 2 or 3 ) > Space heating Operating line Range Factory setting Building time constant 0…200 h 20 h Heating curve Main menu >...
Page 126: Influences On The Flow Temperature Setpoint
Inflection point With a radiator exponent between 1…1.5, the heating curve is only slightly deflected and can therefore be replaced by linearized sections. This is achieved by setting an- other curvepoint, the so-called inflection point. The inflection point lies 30 % below the outside temperature at which the flow tempera- ture setpoint is 20 °C and the outside temperature at curvepoint This means that curvepoint...
Page 127 • Room temperature • Boost heating (refer to subsection 9.7.3 “Quick setback and boost heating”) The basic heating curve applies to a room temperature setpoint of 20 °C. A positive Impact of the room Δ room temperature setpoint change TR corresponds to a displacement of the heating temperature setpoint curve by the same amount toward the outside temperature and to a displacement by the same amount toward the flow temperature.
Page 128 Rule of thumb Due to the room temperature deviation Δ TV, the change of flow temperature setpoint corresponds roughly to the value of: Δ Δ TFl= TR × V × (sHc + 1) Δ TFl Change of flow temperature setpoint sHc Heating curve slope Δ...
Page 129: Heating Limit Switch
The influence of the wind speed is to be set individually for each heating circuit. It can be deactivated (setting ”---“). Main menu > Commissioning > Settings > … or Settings Main menu > Settings > Heating circuit 1 (or 2 or 3 ) > Optimizations/influences Operating line Range Factory setting...
Page 130: Mixing Valve Control
• If the Comfort heating limit is set to “----“ (none), a heating limit will only exist in Economy mode and Protection mode . There will be no change to summer op- eration • If the Economy heating limit is set to “----“ (none), the Comfort heating limit will be active in Economy mode and Protection mode •...
Page 131: Load Control
Operating line Range Factory setting Actuator running time 1…600 s 150 s P-band Xp 1…100 K 50 K Integral action time Tn 0…600 s 60 s For more detailed information about mixing valve control and its setting aids, refer to section 5.7 “Mixing valve control”.
Page 132: Type Of Optimization
9.7.1 Type of optimization The type of optimization determines whether the optimization functions and boost heating are performed based on the acquired room temperature or whether the room model is used. In plants where the heating circuit operates in connection with a ventilation system as a Caution room control combination, the room temperature sensor used for the ventilation plant must not be located in the extract air!
Page 133: Quick Setback And Boost Heating
The maximum forward shift can also be set. Optimum start control can be deactivated by entering 0 hours as the maximum heating up period. Main menu > Commissioning > Settings > … or Settings Main menu > Settings > Heating circuit 1 (or 2 or 3 ) > Optimizations/influences Operating line Range Factory setting...
Page 134: Limit And Protective Functions
Boost heating is activated when a change is made from room operating mode Economy or Protection to Comfort or Precomfort and when the room temperature lies 0.25 K or more below the setpoint. TRSetpt SetptTR SetptCmf SetptEco Room temperature TRSetpt Room temperature setpoint SetptCmf Setpoint, room operating mode Comfort or Precomfort...
Page 135: Limitation Of The Return Temperature
TRw + TR TRw + TR - TRSD Pump TRSD Time Δ TR Temperature differential for switching the heating circuit off Room temperature TRSD Temperature differential for switching the heating circuit on Room temperature setpoint Actual value of room temperature Settings Main menu >...
Page 136 Extra configuration The function is to be activated via “Extra configuration“: … > Heating circuit 1 (or 2 or 3 ) > Inputs > Return sensor Main menu > Commissioning > Settings > … or Settings Main menu > Settings > Heating circuit 1 ( or 2 or 3) > Limitations Operating line Range Factory setting...
Page 137: Minimum Limitation Of The Return Temperature
Main menu > Commissioning > Settings > … or Main menu > Settings > Heating circuit 1 ( or 2 or 3) > Mixing circuit controller Operating line Range Factory setting [Tn] return temp limitation max 0…60 min 30 min 9.8.3 Minimum limitation of the return temperature Using the boiler return temperature sensor, it is possible to implement a common...
Page 138: Pulse Limitation
TFlSetpt Δ TFlSetpt TFlSetpt Maximum increase: Δ Time Δ Unit of time TflSetpt Flow temperature setpoint Δ TflSetpt Rate of setpoint increase per unit of time Settings Main menu > Commissioning > Settings > … or Main menu > Settings > Heating circuit 1 (or 2 or 3 ) > Limitations Operating line Range Factory setting...
Page 139: Pump Overrun And Mixing Valve Overrun
limit value can be set, but the function is always performed with 75 pulses/min (fixed value). The setting value determines the rate at which the flow temperature setpoint will be Integral action time (Tn) lowered: • Short integral action times lead to fast reductions •...
Page 140: Auxiliary Functions
9.10 Auxiliary functions 9.10.1 Text designation Main menu > Commissioning > Settings > … or Main menu > Settings > Heating circuit 1 (or 2 or 3 ) Operating line Range Factory setting Heating circuit 1* Max. 20 characters Heating circuit 1* Time switch 1** Max.
Page 141 Receiving The room temperature transmitted via bus is received by the heating circuit, provided the room zones (geographical zone (apartm.)) of the transmitter accord with those of the receiver. The following variants are available: Variant Effect Diagram The heating circuit operates 1 room sensor directly with its own room temperature.
Page 142: Room Control Combination
9.10.3 Room control combination The heating circuit of the RMH760B can be combined with a heating circuit of some other controller. The combination of 2 room control systems is required when one heating circuit is used for the underfloor heating system and one for the radiators, for example.
Page 143: Fault Handling
Example: Requirement: Ventilation and heating A heating circuit covers the basic load and a ventilation plant the individual load (heat demand) in the space. This application can also accommodate a common time switch or common preselected operating modes, if required. Combination of ventilation and heating Solution:...
Page 144 Faulty return Number Text Effect temperature sensor [HC 1] error return sensor Nonurgent message; must be acknowl- edged [HC 2] error return sensor Nonurgent message; must be acknowl- edged [Heat circuit 3] return sens Nonurgent message; must be acknowl- error edged In the event of a faulty return temperature sensor, the heating circuit behaves as if no return temperature sensor was present.
Page 145 Number Text Effect 2522 [Heat circuit 1 pump B] Nonurgent message. overload Acknowledgement can be selected; factory setting: “Acknowledge and reset.“. No heating circuit stop 2523 [Heat circuit 1 pump] no Nonurgent message; must be acknowl- flow edged and reset. No heating circuit stop 2524 [Heat circuit 1 pump B] no Nonurgent message;...
Page 146: Diagnostic Choices
9.12 Diagnostic choices Main menu > Heating circuit 1 (or 2 or 3 ) > Inputs/setpoints Inputs / setpoints Adjustable values / display / remarks Operating line Actual value outside temp …°C Simulation outside temperature …°C Composite outside temp …°C Attenuated outside temp …°C Actual value flow temp...
Page 147: Dhw Heating
DHW heating 10.1 Overview of function block For applications with storage tank (DHW types DHW 0 through DHW 5), the following Function block function block is available: Con- Circu- Primary Secondary Tank sumer lation Maintain. temp. For application with direct DHW heating (DHW 6), the following function block is avail- able: Con- Circu-...
Page 148: Configuration
10.2 Configuration 10.2.1 General With plant types x–1, x–3, x–5, x–7, DHW heating is activated per default. The DHW Basic configuration plant type preselected per default depends on the type of plant: Plant type Default DHW plant type H0-x, H2-x, H3-x, H4-x DHW 2 H1-x DHW 4...
Page 149: Dhw Plant Types
Operating line Adjustable values / display / remarks [DHW sec pump B] overload Fault input secondary pump B Secondary pump flow signal Flow supervision secondary pump Storage tank sensor top Storage tank sensor bottom Forced charging Flow sensor consumers Optionally for consumer control [DHW circ pump] overload Fault input circulating pump [DHW circ pump B] overload...
Page 150: 3-Position Or Modulating Mixing Valve
Plant type Description DHW 3 Storage tank charging with external heat exchanger and flow control based on the charging temperature (controlled via the storage tank tem- perature). Options: • Maintained secondary circuit • Storage tank sensor at the bottom • Circulating pump •...
Page 151: Pump Control
Extra configuration The output is to be activated via “Extra configuration”: Main menu > Commissioning > Extra configuration > DHW > Outputs > Mixing valve 3- Assign terminal Main menu > Commissioning > Extra configuration > DHW > Outputs > Mixing valve modulating Assign terminal 10.2.4 Pump control...
Page 152: User Request Via Digital Inputs
Operating line Range Factory setting DHW operating mode holidays Protection* Auto / Normal / Reduced / Protection* … Control priorities (refer to subsection 10.3.4) * The legionella function will not be performed Preselection (DHW opera- Here, the plant user can select the required operating mode. In operating mode Auto , tion selector) the current setpoint will be determined by the time program.
Page 153: Plant Operation
10.3.3 Plant operation Plant operation Plant operation indicates whether DHW heating is switched on and what its state is. Main menu > DHW > Plant operation Operating line Range Factory setting Auto / Off* Auto Preselection State Off / DHW ready / Charging active / Electric Cause...
Page 154 Operating on the controller, Interventions or via bus via digital inputs Settings 24-hour program, Cmf, Pcf, Eco, Prt Holiday contact On, Off holiday/special day program Special day, holidays Specual day contact On, Off Settings calendar Calendar Switching program Auto, Normal, Reduced, Protection Resulting operating mode DHW mode selector...
Page 155: Dhw Setpoints
Priority Size Explanation DHW operating mode Using the DHW operating mode contact, a fixed contact operating mode can be preselected. This operating mode overrides DHW operation selector in the controller DHW operation selec- Using the DHW operation selector, it is possible to switch from operating mode Auto to a continuous operating mode with the respective setpoint.
Page 156: Storage Tank Charging
The setpoint currently active for storage tank charging appears on the Main menu and Inputs / setpoints on the info page. (display) Main menu > DHW > Inputs/setpoints Operating line Range Factory setting Storage tank temp setpoint 5…140 °C For detailed information about the generation of the storage tank temperature setpoint, refer to subsection 10.4.1 “Charging control via the storage tank temperature”.
Page 157 An additional storage tank sensor can be configured for storage tank charging control. Storage tank sensor The storage tank sensor at the bottom allows better usage of the storage tank volume. at the bottom Extra configuration The function is to be activated via “Extra configuration”: …...
Page 158: Forced Charging
Settings Main menu > Settings > DHW > DHW Operating line Range Factory setting Switching differential 1…20 K Setback DHW setpoint bottom 0…20 K In operating modes “Normal “ and “Reduced ”, the storage tank temperature setpoint Storage tank tempera- corresponds to the adjusted setpoint.
Page 159: Maximum Charging Time
Settings Main menu > Settings > DHW > DHW Operating line Range Factory setting Forced charging Never / Never With 1st change to normal / With every change to normal Forced charging If the storage tank shall already be fully charged at the beginning of the day (to the normal setpoint ), the setting to be selected is With 1st change to normal .
Page 160: Direct Dhw Heating
In addition, the maintained secondary circuit serves as an additional discharge protec- tion. But the “Discharge protection“ function remains active because the secondary pump is controlled based on the primary temperatures on the heating side. The maintained secondary circuit can only be used in connection with DHW plant types DHW 3 through DHW 5.
Page 161: Adapting The Control Parameters
Operating line Range Factory setting Actuator running time closing 1…600 s 15 s P-band Xp at min load 1…200 K 100 K P-band Xp at max load 1…200 K 33 K Integr action time Tn at min load 0…600 s 30 s Integr act time Tn at max load 0…600 s...
Page 162 can be set for both load ranges. For the medium load ranges, the values will be aver- aged in a continuous process. When commissioning direct DHW heating for the first time, the default values of Xp, Tn and Tv should be used. To optimize and check the control parameters, it is recom- mended to follow the procedure detailed below under ”Checking the control function…”.
Page 163: Requirements For The Plant
Increase Tv in steps of 2 to 5 seconds while the load is at its maximum. If this is not sufficient: Increase Tn in steps of 10 to 20 seconds while the load is at its maximum. To check the control, the start is made again with the preset control parameters, but Checking the control this time under minimum load conditions.
Page 164 Main menu >Commissioning > Extra configuration > DHW > Inputs > Flow signal Assign terminal Main menu > Commissioning > Settings > … or Setting Main menu > Settings > DHW > Controller primary circuit Operating line Range Factory setting Min stroke with flow signal 0…100 % 25 %...
Page 165: Maximum Charging Time
Further setting choices for the circulating pump are described in subsection 10.11.3 “Circulating pump”. Note The cold water must join the DHW from the circulation pipe right by the heat exchanger. If, for plant reasons, this is not possible, the “Min stroke with flow signal” must be set to 0 %.
Page 166: Sequence Of Legionella Function
Practical problems in The legionella protection function contradicts with requirements in terms of energy connection with legionella savings, the formation of scale (the higher the storage tank temperature, the more protection scale) and protection against scalding (above 60 °C). Attention must be drawn to the risk of scalding when opening taps on completion of the legionella function.
Page 167 During the time the legionella program is active, the circulating pump continues to operate as preselected. The circulating pump can be specifically activated to become included in the legionella function. For that purpose, parameter “Circulating pump operation legio“ is used. If this parameter is set to “On“, the circulating pump will operate according to characteristic in the graph above.
Page 168: Legionella Function Relay
Legionella protection time This defines the time of day the legionella function shall be started. Legionella protection It is defined here for what period of time the DHW temperature shall be maintained at period the legionella protection setpoint. Using setting “On“ on operating line Circulating pump operation legio , the circulating pump Legionella protection and circulating pump will be activated according to the following rule, independent of the pump’s time pro-...
Page 169: Primary Temperature Setpoint
Main menu > Commissioning > Settings > … or Main menu > Settings > DHW > Controller primary circuit Operating line Range Factory setting Actuator running time 1…600 s 150 s P-band Xp 1…100 K 50 K Integral action time Tn 0…600 s 60 s 10.7.1 Primary temperature setpoint...
Page 170: Load Control
The effective setpoint appears on the Main menu and on the info page. Display of setpoints Main menu > DHW > Inputs/setpoints Operating line Adjustable values / display / remarks Storage tank temp setpoint 0…140 °C Flow temp sec setpoint 0…140 °C Primary flow temp setpoint 0…140 °C...
Page 171: Limitation Of The Return Temperature
Settings Main menu > Commissioning > Settings > … or Main menu > Settings > DHW > DHW Operating line Range Factory setting Discharge protection Yes / No Storage tank charging During storage tank charging, discharging protection switches the respective charging active pump off if: DHW plant type...
Page 172: Frost Protection Functions
Main menu > Commissioning > Settings > … or Main menu > Settings > DHW > Controller primary circuit Operating line Range Factory setting [Tn] return temp limitation max 0…60 min 30 min Extra configuration The return temperature sensor must be assigned a terminal via “Extra configuration”: Main menu >...
Page 173: Pump Overrun And Mixing Valve Overrun
The pulses are delivered via the meter inputs of function block “Meter”. For more Meter inputs detailed information about this function block, refer to chapter 11 “Function block me- ter”. After one or several meter inputs have been configured, pulse limitation can be set up. Main menu >...
Page 174: Pump Kick And Valve Kick
Main menu > Settings > DHW > Controller primary circuit Operating line Range Factory setting Overrun time secondary pump 0…60 min 1 min 10.8.6 Pump kick and valve kick Pump kick and valve kick are protective functions that are performed at a certain interval. They prevent pumps and / or actuators from seizing after longer off periods.
Page 175: Auxiliary Functions
During DHW heating, there is no restriction for the heating circuits with regard to heat No priority consumption. But the heat source provides maximum limitation of the temperature for DHW heating. If the heat source does not reach the required flow temperature setpoint, the amount of Shifting priority heat drawn by the heating circuits will be restricted by a load reduction.
Page 176: Circulating Pump
10.11.3 Circulating pump A circulating pump can be configured for DHW circulation. The output is to be activated via “Extra configuration”: Extra configuration Main menu > Commissioning > Extra configuration > DHW > Outputs… > Circulating pump Assign terminal Control can take place via a specific time program or depending on user requirements (DHW time switch).
Page 177: Electric Immersion Heater
10.11.4 Electric immersion heater Plant types With the exception of DHW plant type DHW 0, which uses exclusively an electric immersion heater, all DHW plant types with storage tank can be switched to electric immersion heater during summer operation. Operation with an electric immersion heater is identical to space heating mode with the same DHW operating modes, set- points, legionella function, etc.
Page 178: Consumer Control
Example The boiler pump is located at A and required as a system pump for DHW heating. Input: System pump required = Yes The boiler pump is located at B and is not required for DHW heating. Input: System pump required = No 10.11.6 Consumer control Any DHW plant type can be equipped with consumer control.
Page 179: Fault Handling
Consumer control only uses the 2 setpoints “Normal“ and “Reduced“. Setpoints On the service level, it is also possible to set a setpoint reduction against the general legionella setpoint. The legionella setpoint of consumer control is calculated as follows: Legionella setpoint – Legionella setpoint reduction Main menu >...
Page 180 Faulty secondary flow Number Text Effect sensor DHW flow sensor sec error Nonurgent message; must be acknowl- edged If the sensor is required for control (plant types DHW 3, DHW 4, and DHW 6) and no primary flow temperature is available (plant type DHW 4), the mixing valve will fully close.
Page 181: Diagnostic Values
Faulty circulating pump Number Text Effect 2571 [DHW circ pump] overload Nonurgent message. Acknowledgement can be selected; factory setting: “Acknowledge and reset“ 2572 [DHW circ pump B] over- Nonurgent message. load Acknowledgement can be selected; factory setting: “Acknowledge and reset“ 2573 [DHW circ pump] no flow Nonurgent message;...
Page 182 Operating line Adjustable values / display / remarks Electric immersion heater Off / On Mix valve pos consumers 0…100 % (3-position and modulating) Circulating pump Off / On Circulating pump B Off / On Legionella function relays Off / On Main menu >...
Page 183: Function Block Meter
Function block meter 11.1 Overview of function block Counter Meter input 1 Meter input 2 Meter input 3 Meter input 4 11.2 Configuration Extra configuration The meters are to be activated via “Extra configuration” by assigning a terminal to the meter input.
Page 184: Pulse Valency
The meters are used to optimize plant operation. They also serve for limiting the pulses. The following types of meters can be used: Types of meters • Mechanical pulse sources (Reed contact) with no Namur circuitry, having a maxi- mum pulse frequency of 25 Hz and a minimum pulse duration of 20 ms •...
Page 185: Overflow Value
11.5 Overflow value The overflow value ensures that both meter and RMH760B show the same display. The value at which the meter’s display is reset to 0 can be set. The unit and the decimal point are dependent on the unit and the format displayed. The overflow value can only be changed via the OCI700.1 service tool.
Page 186: Fault Handling
11.9 Fault handling Battery-powered or mechanical meters also continue metering in the event of a power failure. In the event power supply to the RMH760B fails, the pulses will not be counted during that period of time. When leaving the “Extra configuration” menu, a restart will be made. Pulses received between the last storage operation and the restart (maximum 5 minutes) are counted.
Page 187: Function Block Miscellaneous
Function block miscellaneous 12.1 Overview of function block Miscellaneous 12.2 Configuration Function block “Miscellaneous“ is always available. To activate the function block, no special basic configuration is required. The common functions required for the plants can be activated via “Extra configura- Extra configuration tion”.
Page 188 As a reference variable for the heat demand transformers − For frost protection functions − For locking the boiler depending on the outside temperature − For forwarding via data bus. This enables the measured value to be used in heat- −...
Page 189: Outside Temperature Simulation
outside temperature zone set. An outside temperature zone identified by “----“ means that the outside temperature on the bus is inactive. To enable different outside temperature signals to be distributed via bus (e.g. outside temperature for heating zone North, outside temperature for heating zone South), they must be assigned to own outside temperature zones.
Page 190: Fault Handling
12.3.2 Fault handling When leaving the “Commissioning“ menu, a check is made to see if the outside sensor is connected or a sensor value is received via bus. If there is no outside temperature, or in the case of a short-circuit, fault status message “Outside temp sensor error“ will appear.
Page 191: Outside Temperature Relay
Number Text Effect >1 wind speed sensor in More than one wind speed sensor in the zone same wind zone Urgent message; must be acknowledged 12.4 Outside temperature relay For each outside sensor, an outside temperature relay is available. It is irrelevant here whether the outside temperature is directly acquired or transmitted via bus.
Page 192: Display Inputs
12.5 Display inputs On the RMH760B, universal inputs can be defined for display purposes. Configuration Main menu > Commissioning > Extra configuration > Miscellaneous > Inputs Adjustable values / display / remarks Operating line Display input 1 Assign terminal Display input 2 Assign terminal Display input 3 Assign terminal...
Page 193: Diagnostic Choices
12.6 Diagnostic choices Main menu > Miscellaneous > Inputs Inputs Operating line Range Actual value outside temp …°C Actual value solar radiation W/m2 Actual value wind speed Display input 1 Display input 2 Display input 3 Display input 4 Inputs Main menu >...
Page 194: Function Block Faults
Function block faults 13.1 Overview of function block Function block “Faults“ collects all fault status messages that have occurred, sorts them according to their importance for display and stores the last 10 messages in the fault history. The function block signals acknowledgements and resettings made by the user to the application where the fault occurred.
Page 195: Fault Button
13.3 Fault button Fault status messages delivered to the controller are indicated by the LED in the fault button. If a fault status message needs to be acknowledged, the acknowledgement must also be made via the fault button. There are 3 choices: Indication Cause / procedure Button dark...
Page 196: Signal Priority
Example If the outside temperature is missing, a fault status message will be delivered. When the outside temperature is available again, the fault status message automatically disappears and the plant will resume normal operation. These types of fault require an acknowledgement. Standard fault Example If there is more than one time switch master in the same geographical zone, the fault...
Page 197: State Diagrams Of The Individual Types Of Faults
13.6 State diagrams of the individual types of faults A simple fault need not be acknowledged. If there is a fault relay (see below), it must be Simple fault reset, however. No fault (acknowledged) Fault coming Fault going Faulty (acknowledged) When there is a simple fault, the LED is lit.
Page 198: Predefined Fault Inputs
Aggregate or plant stopped LED off LED lit LED flashes Acknowledge fault No fault, No fault, No fault, not acknowledged, acknowledged acknowledged reset Fault coming Fault coming Fault Fault going going Faulty, Faulty, not acknowledged acknowledged Acknowledge fault LED lit LED flashes 13.7 Predefined fault inputs...
Page 199: Analog Fault Input With Limit Value Supervision
Operating line Range Factory setting Fault text Max. 20 characters [Fault input 1] fault* Fault status message delay 00.00…59.55 m.s 00.05 m.s (minutes.seconds) Fault acknowledgement None / Acknowledge / None Acknowledge and reset Fault priority Urgent / Not urgent Not urgent Effect of fault No stop / Stop None...
Page 200: Communication
Main menu > Commissioning > Settings > … or Main menu > Settings > Faults > Fault input 1 (or 2, 3 or 4 ) Operating line Range Factory setting Limit value fault on 0 / 1* Limit value fault off 0 / 1* * Depending on the input identifier;...
Page 201: Fault Relay
Setting values Main menu > Commissioning > Communication > Basic settings Operating line Range Factory setting Remote reset of fault No / Yes Conversely, the controller is not able to acknowledge fault status messages on other controllers. 13.10 Fault relay Passing on the fault To pass on the fault status messages, or to optically or audibly indicate them on the control panel, for example, the 2 fault message outputs Fault relay 1 and Fault relay 2 of...
Page 202: Fault Display
13.11 Fault display The current state of the fault status messages can be interrogated on the operator unit. Faults current The current faults contain all faults currently pending. A maximum of 10 faults can be displayed. With each fault, following is displayed: •...
Page 203 Outputs Main menu > Miscellaneous > Outputs Operating line Range Fault relay 1 Off / On Fault relay 2 Off / On Fault display Main menu > Faults > Faults current Adjustable values / display / remarks Operating line Fault 1 up to fault 10 Main menu >...
Page 204: Communication
Communication A detailed description of communication is given in Basic Documentation P3127 (Communication via Konnex bus). In the following, the most important settings are described that are required for commissioning a basic plant. Communication is activated when the following conditions are satisfied: Activating communica- •...
Page 205: Calendar Data (Holidays And Special Days)
RM.. RM.. Time of day Time of day Device 1 Device 2 Master Slave Legend for all figures in this Signal transmitter chapter: Signal receiver Remote reset of fault With communication activated, the actions are the following: • Fault status messages are always delivered via bus and can be further handled by other Synco devices •...
Page 206: Room Data
Holidays/special day zone With master / slave operation, this setting is used to make the zone assignment. In that case, the slave devices are given the same holidays/special day zone as the master. It is possible to define several zones with one master per zone. RM..
Page 207 Holidays/special days The occupancy times (time switches) of the different geographical zones are on an (variant 2) individual basis, but all (or individual) zones use the same holidays and special days. Hence, a common calendar for the common holidays and special days shall be used. The common calendar has an impact on the time switches of the heating circuits.
Page 208 QAW740 RM.. RM.. Room operating mode Room operating mode Setpoints Setpoints Room unit Heating circuit 1 Heating circuit 2 Geographical zone: 5 Geographical zone: 5 Geographical zone: 5 Room control combination = Room control combination = Master Slave internal setpoints Extension of variant 4 In the case of a room control combination, the setpoint can be adopted, in addition to with the same setpoints...
Page 209: Settings On The Rmh760B
Variant 1 Variant 2 Variant 3 Variant 4 Variant 5 Holiday / special days Time switch Room operating mode switch Room unit Digital inputs Setpoints Plant Holiday/special day zone Holiday/special day operation Autonom Autonom Master Auton. Auton. Auton. Slave Geogr. zone (apart.) Time switch slave (apart.) Room control combination Master...
Page 210: Settings On The Room Unit
Time switch slave If the time switch shall operate as a slave of a master time switch, the geographical zone of the master time switch must be set here. If that is the case, no more time switch data about the geographical zone will be for- warded.
Page 211: Heat Demand And Load Control
Time switch program in If, on a slave controller, “Autonomous“ is entered as time switch operation plus a time slave controllers switch program, the latter will be ignored. In any case, the time switch program used is that of the master controller. This also applies to special days. 14.5 Heat demand and load control Heat demand and the load control signals are exchanged via the heat distribution...
Page 212 Controller 1 Controller 2 Heat Heat consumer consumer primary controller Heat source Heat consumer Heat consumer Heat demand Heat request Heat demand Heat request Heat demand Heat demand Controller 1 Controller 2 Heat distribution zone, heat source side = 1 Heat distribution zone = 1 Heat distribution zone = 2 Example without main...
Page 213: Weather Data
Controller 1 Controller 2 Heat Heat consumer source Heat consumer Heat demand Heat request Heat demand Controller 1 Controller 2 Heat distribution zone = 1 Heat distribution zone = 1 14.6 Weather data The outside temperatures are exchanged via the outside temperature zones. When an outside sensor is connected to the controller with outside temperature zone 1, that controller transmits its outside temperature to all receivers with outside tempera- ture zone 1.
Page 214: Fault Handling
Main menu > Commissioning > Communication > Distribution zones Communication Operating line Range Factory setting Outside temperature zone ---- / 1…31 Solar zone ---- / 1…31 ---- Wind zone ---- / 1…31 ---- The settings made here are also displayed under: Main menu >...
Page 215 Number Text Effect 5111 System time switch failure 2 Time switch master missing or cannot be received. Nonurgent message; must not be ac- knowledged 5121 System time switch failure 3 DHW time switch master missing or cannot be received. Nonurgent message; must not be ac- knowledged 5301 DHW system time switch...
Page 216 Number Text Effect 5402 >1 identical geogr zone [1] More than one room master for plant 1 in the same geographical zone. Nonurgent message; must be acknowl- edged Room master and zone Number Text Effect error in heating circuit 2 Room master failure in HC 2 5411 Room master for the room control combi-...
Page 217: Fault Tracing Aids
Fault tracing aids If a fault is displayed, it is always practical to select operating line Faults > Faults current and look for any pending fault status messages before starting to rectify faults. In the event of a faulty extension module, that fault must always be rectified first since it may lead to consequential fault status messages.
Page 218 For explanation, refer to Number Name section / subsection… DHW flow sensor primary error 10.12 DHW flow sensor sec error 10.12 DHW flow sensor cons error 10.12 DHW return sensor error 10.12 Flue gas temp sensor error 6.11 2101 Legionella protection error 10.12 2202 Main contr h’request mod error...
Page 219 For explanation, refer to Number Name section / subsection… 2552 [DHW primary pump B] overload 10.12 2553 [DHW prim pump] no flow 10.12 2554 [DHW prim pump B] no flow 10.12 2555 [DHW primary pump] fault 10.12 2561 [DHW sec pump] overload 10.12 2562 [DHW sec pump B] overload...
Page 220: Troubleshooting
For explanation, refer to Number Name section / subsection… 9002 [Fault input 2] fault 13.8 9003 [Fault input 3] fault 13.8 9004 [Fault input 4] fault 13.8 9401 No pulse signal meter 1 11.9 9402 No pulse signal meter 2 11.9 9403 No pulse signal meter 3...
Page 221: Appendix
Appendix 16.1 Configuration diagrams The use of the configuration diagrams is explained in subsection 3.2.4. 16.1.1 Terminal markings The designations of the signal inputs and outputs and of the assigned connection terminals are structured as follows: Example Explanation N.X3 N = controller RMH760B X3 = universal input A9(2).Y1 A9 = type of extension module...
Page 222 Basic type H 3133W01_H_en 222/238 Building Technologies Modular Heating Controller RMH760B CE1P3133en HVAC Products 16 Appendix 05.02.2007...
Page 223 Plant type H0-7 3133W02_H0-7_en 223/238 Building Technologies Modular Heating Controller RMH760B CE1P3133en HVAC Products 16 Appendix 05.02.2007...
Page 224 Plant type H1-5 224/238 Building Technologies Modular Heating Controller RMH760B CE1P3133en HVAC Products 16 Appendix 05.02.2007...
Page 225 Plant type H2-5 3133W04_H2-5_en 225/238 Building Technologies Modular Heating Controller RMH760B CE1P3133en HVAC Products 16 Appendix 05.02.2007...
Page 226 Plant type H3-5 3133W05_H3-5_en 226/238 Building Technologies Modular Heating Controller RMH760B CE1P3133en HVAC Products 16 Appendix 05.02.2007...
Page 227 Plant type H4-5 3133W06_H4-5_en 227/238 Building Technologies Modular Heating Controller RMH760B CE1P3133en HVAC Products 16 Appendix 05.02.2007...
Page 228 Plant type H5-7 3133W07_H5-7_en 228/238 Building Technologies Modular Heating Controller RMH760B CE1P3133en HVAC Products 16 Appendix 05.02.2007...
Page 229 Plant type H6-7 3133W08_H6-7_en 229/238 Building Technologies Modular Heating Controller RMH760B CE1P3133en HVAC Products 16 Appendix 05.02.2007...
Page 230: Editable Text
16.2 Editable text The list with editable text shall serve as an aid for engineering and commissioning. Maximum length of the text is 20 characters. On the password level, user text, such as menu text, fault text and datapoint text, can be reset as follows: Main menu >...
Page 231: Faults
Main menu > Settings > Boiler > Fault settings > Fault input 1 (or 2 or 3 ) Name of datapoint User-defined text Fault text: Fault text: Fault text: 16.2.6 Faults Main menu > Settings > Faults > Fault input 1 (or 2, 3 or 4 ) Name of datapoint User-defined text Fault text 1:...
Page 232 232/238 Building Technologies Modular Heating Controller RMH760B CE1P3133en HVAC Products 16 Appendix 05.02.2007...
Page 233 Index commissioning aids boiler .........70 commissioning data set..........37 2-position control 1-stage burner ......71 communication ............204 2-position control 2-stage burner ......72 communication holidays/special days .......47 communication time switch .........39, 44 composite outside temperature.......124 absolute priority............175 concluding commissioning ........37 access levels.............
Page 234 disposal ..............14 frost protection for the plant, primary controller ..104 district heat parameters, access right......17 frost protection request 2-position ....98, 102 documentation............13 function block boiler temperature control....63 function block DHW heating ........147 function block faults ..........194 economy heating limit..........130 function block heating circuit control.......
Page 235 limitation of the rate of flow temperature increase .. 137 mixing valve overrun, DHW circuit ......173 limitations main controller / primary controller..104 mixing valve overrun, protection against boiler list of fault numbers..........217 overtemperatures..........80 load balance.............. 88 modulating burners, control........75 load control ...............
Page 236 pulse limitation DHW circuit........172 setpoint increase main controller/primary controller103 pulse limitation, main controller/primary controller ..107 setting aids mixing valve control....... 56 pulse valency............184 setting level............... 17 pump control in general..........59 setting rules control of mixing valve......57 pump control main controller ........99 setting/resetting meter readings ......
Page 237 wind speed ..............129 valve kick ..............53 wind zone ..............214 valve kick DHW circuit ..........174 wiring .................14 valve kick general ............. 80 wiring test ..............36 valve kick heating circuit ......... 139 yearly clock ...............39 weather data communication ........213 weather-compensated heating circuit control ..
Page 238 Siemens Switzerland Ltd © 2007 Siemens Switzerland Ltd Building Technologies Group Subject to alteration HVAC Products Gubelstrasse 22 CH – 6301 Zug Tel. +41 41 724 24 24 Fax +41 41 724 35 22 www.sbt.siemens.com 238/238 Building Technologies Modular Heating Controller RMH760B...

Siemens Synco 700 Basic Documentation

1 Summary

2 Operation

3 Commissioning

4 General Settings

5 General Functions, Fundamentals

6 Boiler Temperature Control

7 Heat Demand and Heat Requests

8 Main Controller and Primary Controller

9 Heating Circuit Control

10 DHW Heating

11 Function Block Meter

12 Function Block Miscellaneous

13 Function Block Faults

14 Communication

15 Fault Tracing Aids

16 Appendix

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Summary of Contents for Siemens Synco 700