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Summary of Contents for heat-timer Mini-MOD-CNC
- Page 1 INSTALLATION AND OPERATION MANUAL MINI-MOD-CNC & EXTENSION C O N D E N S I N G / N O N - C O N D E N S I N G C O N T R O L FOR HYDRONIC HEATING SYSTEMS...
- Page 2 WARNING The Mini-MOD-CNC is strictly an operating control. It CANNOT be used as a limit control. All boilers must have all safety and limit controls required by code. It is the responsibility of the installer to verify that all the safety and limits are working properly.
- Page 3 TABLE OF CONTENTS MINI-MOD-CNC OVERVIEW OPERATING MENU SEQUENCE OPERATING SETTINGS MINI-MOD-CNC LAYOUT PROGRAM CHANGE SETTINGS SEASON MINI-MOD EXTENSION LAYOUT RESET RATIO OFFSET FEATURES OUTDOOR CUTOFF TEMPERATURE MINIMUM WATER TEMP OUTDOOR RESET CONCEPT MAXIMUM WATER TEMP RESET RATIO/OUTDOOR RESET SYSTEM SETTINGS...
- Page 4 4–20mA modulating signal or voltage modulating signal. Depending on the actual Target Temperature, the Mini-MOD-CNC will determine which group of boilers will be the lead and which group will be the lag group. The Condensing Group of boilers will be the Lead group when the Target Temperature is below the Switching Set Point.
- Page 5 When the Mini-MOD-CNC requires reduced output, it will reduce the modulation of the lag boiler until it reaches its Ignition %. That shall be followed by the reduction of modulation of the lead boiler until it reaches 40% percent of the Modulation Start %. This shall trigger the control to turn off the lag boiler.
- Page 6 When connecting Outdoor and System Sensors, outputs. Each is wired in series no Polarity is observed. Prove terminals must with each boiler’s limit circuit. be connected for the Mini-MOD-CNC to operate the boilers. Connect Extension panels to add System Output controls pumps, valves, or Four modulation outputs can be 0–5V,...
- Page 7 MAKE SURE YOU HAVE THE RIGHT CONTROL If you need the Mini-MOD to do additional tasks that either are not listed or do not know how to configure them, contact Heat-Timer Corp. Technical Support either by Phone (973) 575-4004, Fax (973) 575-4052, or by E-mail support@heat-timer.com.
- Page 8 PID TYPE LOGIC The Mini-MOD-CNC’s control algorithms allow it to look at the rate of change in the system. If the system temperature is changing quickly, the Mini-MOD-CNC will react quickly to adjust the modulating stages’ output. If the system temperature changes slowly, the Mini-MOD-CNC will make slow and gradual output adjustments.
- Page 9 (SYS). This means that for each degree the outdoor temperature dropped the water With a +20° Offset, the Reset curves temperature will increase 2 degrees. The Mini-MOD-CNC has a full range of Reset begin at 120° Water Temperature. Ratios to match any buildings heat loss characteristics.
- Page 10 INITIAL SETUP Setting an Initial Program will ease the configuration of the Mini-MOD-CNC and will give the opportunity to utilize many of the energy saving features and give more comfortable heat when needed. The program should consist of the following: •...
- Page 11 • This feature lets the Mini-MOD-CNC run the SYS relay for a longer period after the boilers have been turned off. When this relay is used to control a pump, it helps in dissipating the excess heat from the boilers combustion chamber.
- Page 12 INSTALLATION Each of the Mini-MOD-CNC or Mini-Extension consists of three Enclosure Display Module primary enclosure components. • The Enclosure Display Module: contains the display, buttons, LEDs and electric wiring terminals. It has two screws to hold it to the base. A program configuration switch, used to adjust Mini-MOD-CNC settings, is placed above the terminals.
- Page 13 • The sensor must be located where it sees the output of all the boiler stages. If a boiler is piped so that the sensor does not see its output, the Mini-MOD-CNC will NOTE not sequence the boilers correctly.
- Page 14 The Mini-MOD-CNC will vary the system Set Point based on outdoor temperature. In addition, the outdoor sensor is used as an Outdoor Cutoff. The Mini-MOD-CNC will disable all boilers when the outdoor temperature is above the adjustable Outdoor Cutoff temperature.
- Page 15 A typical use of this feature is to check for pump flow or combustion air damper status before firing any boiler. • If the PROVE input is open on a call for heat, the Mini-MOD-CNC will enable only the System Output. All boiler outputs will be off when the PROVE input is open. •...
- Page 16 Class 1 voltages must enter the enclosure through a different opening from any Class 2 voltage wiring. • Note that some modulating boilers may not require the use of these outputs. BOILER BOILER ENABLE OUTPUT HEAT-TIMER CORP. 059102-00 REV. C...
- Page 17 The Mini-MOD-CNC and the Mini-Extension sources 24VDC excitation voltage for the 4–20mA signal. • Wire the (–) from the modulating motor to the boiler terminal on the Mini-MOD-CNC marked (GND). That is for boiler A, the modulating (–) terminal will be 13. 4-20mA •...
- Page 18 CONNECTING TO THE 4–20mA EMS INTERFACE • The Mini-MOD-CNC is equipped with a 6-pin phone socket (RS485) to connect to extension panels and 4–20mA EMS Interface. The 4–20mA EMS Interface (P/N 926741-00) is equipped with two 6-pin phone sockets to connect to Mini-MOD-CNC and an additional Mini-Extension.
- Page 19 • The BACnet Interface Module comes with an RJ45 cable. • Both the Mini-MOD-CNC module and the BACnet Interface Module are equipped with a RJ45 socket (RS485) connection to communicate to each other. • The Interface BACnet Module must be wired to the BACnet MSTP network using the RS485 terminals A, GND, and B.
- Page 20 DHW No Priority LO/LO/HI/HI Shutdown/Disable No Priority (Summer) Tstat/Enable BACK SAVE BACK SAVE Setback BACK SAVE SENSOR FAULT BACNET MODE BOST MODE All Off Disable All On Enable 30 Minutes Disable BACK SAVE BACK SAVE BACK SAVE HEAT-TIMER CORP. 059102-00 REV. C...
- Page 21 STARTUP SETTINGS PROGRAM CHANGE SETTINGS PROGRAM To be able to change the Mini-MOD-CNC settings the PROGRAM/RUN Switch must be -------- SETTINGS ---- set to Program. The switch is located under the Enclosure Wiring Cover for security. The Season Winter Enclosure Wiring Cover can be secured using a lock.
- Page 22 • Note that if the Switch Delay was set to 0.0 hours, the Mini-MOD-CNC will utilize it built-in delays. These delays vary between 3 to 15 minutes based on the Boiler Types used.
- Page 23 SAVE • Select the number of condensing boilers. These boilers will occupy the first letters of the wiring stages on the Mini-MOD-CNC starting with Stage-A. • Then, select the number of non-condensing boilers later in the Startup menu. See “STARTUP MENU SEQUENCE” on page 19.
- Page 24 If either of the Condensing or Non-Condensing Boiler Groups was set to Modulating as 4-20ma the Boiler Type, the Mini-MOD-CNC will offer the capability of controlling a variety of 0-10v modulating signals. Each boiler can be configured to have a different modulating signal.
- Page 25 LO/HI/LO/HI LO/LO/HI/HI energized alone than with the higher stages. For these types of boilers select Lo/Lo/Hi/Hi. Then, the Mini-MOD-CNC will sequence the lower stages of all boilers their Mode is set to BACK SAVE Auto before sequencing the higher stages.
- Page 26 Default: 180ºF/82ºC BACK SAVE Button: MENU/<System Startup>/.../DHW Set Point • On a DHW call, the Mini-MOD-CNC will raise the target to the DHW Set Point until the DHW call expires. SHUTDOWN/TSTAT/SETBACK MODE SETBCK/SHUTDOWN Shutdown Input, Tstat Input, Setback Input Default: Shutdown Input...
- Page 27 Mode set to Auto when a sensor reads Short or Open. • When All-On is selected, the Mini-MOD-CNC will turn all boilers On to 100% when the System reads Short or Open and the outdoor temperature is below Outdoor Cutoff.
- Page 28 SETTING THE CONTROL TO FACTORY DEFAULTS TOTAL CLEAR STARTED To Reset the Mini-MOD-CNC control to its original factory defaults, power down the Release buttons control. Hold down the two right most buttons while powering the control back up until the Total Clear Started screen appears.
- Page 29 OFFSET 5 min NOTE +0°F BACK SAVE To be able to change the BACK SAVE Mini-MOD-CNC settings the PROGRAM/RUN Switch LEAD ROTATION OUTDOOR CUTOFF must be set to Program. Manual The switch is located Time 65°F under the Enclosure Wiring Last-On Cover for security.
- Page 30 Winter. Reset cu 100° Wa • When the heating season is over, it is a good practice to switch the Mini-MOD-CNC to - EMS INPUT MODE - ------ SET POINT ---- Disable Summer setting. This will allow DHW calls to operate the boilers when needed.
- Page 31 (Note: The lowest water temperature the Mini-MOD-CNC will circulate is 70°F. If the Outdoor Cutoff is turned ON and the Season is set to Winter, the Mini-MOD-CNC will circulate at least 70°F water even in the hottest of weather.) In the OFF position, the system pump will always be off and all burner stages will be off.
- Page 32 The Minimum Water Temperature must be set to the boiler manufacturer’s specification. The Mini-MOD-CNC will calculate the Set Point based on the Outdoor temperature (OD), the Reset Ratio, and the Offset value. The Mini-MOD-CNC will control all boilers to hold either the Set Point temperature, or the Minimum Water Temperature, whichever is higher.
- Page 33 Many boilers go through a purge cycle before they are brought on line. When the • Mini-MOD-CNC activates a boiler, it does not start to calculate its output until the Purge NOTE Delay is over. This allows the boiler to fully come online and begin producing output.
- Page 34 Therefore, shorter Standby Times will result in smoother set point operation in extreme conditions. On the other hand, longer Standby Times may prevent a Standby boiler from firing if the other boilers can eventually meet the load, or if the load decreases. HEAT-TIMER CORP. 059102-00 REV. C...
- Page 35 The Last Stage Hold prevents short cycling of the Lead Stage during low demand periods. • In these conditions, the system might require less output than the lowest lead Stage. When the Mini-MOD-CNC brings on the Lead Stage, the Set Point is quickly exceeded, and the Mini-MOD-CNC turns the Lead Stage off. •...
- Page 36 That number will blink for the Soft-Off delay period. • If during the Soft-Off delay period the Mini-MOD-CNC needed that stage to turn back on, the stage will be released from the Soft-Off delay and resume normal operation. •...
- Page 37 It is the amount of time it takes a single stage to affect the system. REATION TIME • After the Mini-MOD-CNC turns on a stage trying to meet a set point, it will not turn on 2 min another stage until the Reaction Time has elapsed.
- Page 38 06:00a Button: MENU/<System Settings>/<More Settings>/Day/Night Schedule Night Schedule 08:00p • The Mini-MOD-CNC has two levels of heat. The Day (Normal) level is used when a BACK SAVE building is occupied and people are active. • The Night (Setback) level is used when a building is not occupied, or when people are DAY SCHEDULE sleeping.
- Page 39 HISTORY Button: MENU/<Histories> The Mini-MOD-CNC provides users with a graphical history of the System and Outdoor temperatures for the previous 24 hours. The temperatures are sampled every 12 minutes. That is, readings of both System and Outdoor temperatures are recorded and stored every 12 minutes for the last 24 hours.
- Page 40 BACK SELECT -- OUTPUT A TYPE -- 4-20ma Button: MENU/<Maintenance>/<Configuration> 0-10v 0-5v PROVE • This menu option provides a consolidated view of the Mini-MOD-CNC’s Startup and 2-10v Bst: 30, All On 1-5v Stage settings. 4-20, 4:20, ▲ ▼ BACK SAVE...
- Page 41 DISPLAY The Mini-MOD-CNC display layout provides a variety of information that gives an immediate picture of the operation status. The display shows two boilers at a time. When extensions are present, the two middle buttons (◄ ►) scroll the screen to view additional boilers.
- Page 42 17 MAINTENANCE DISPLAY MESSAGES The Mini-MOD-CNC display layout reserved the second line for message indications. The following is a list of the most common Message Display Line information: • Boost To 170˚F The Boost has started 30 minutes before the Day Schedule setting and the Boost temperature is 170˚F.
- Page 43 • The following list describes the MODE options: BACK SAVE Auto The Mini-MOD-CNC will control the boiler’s operation to maintain the desired Set Point. Only boilers set to Auto can - EMS INPUT MODE - be Lead boilers. Disable Enable...
- Page 44 • Heat-Timer suggests that when Parallel is selected as the Modulation Mode to set the Modulation percent equal to or slightly higher than double the Ignition %.
- Page 45 BUILDING HEATING LOOP SYSTEM: The Mini-MOD-CNC operates 2 modulating boilers and 2 On/Off Boilers. The boilers are piped in Reverse Return on the primary loop. The System output is controlling the System Pump. Heat-Timer Corp. is aware that each installation is unique. Thus, Heat-Timer Corp. is not responsible for any installation related to any electrical or plumbing diagram generated by Heat-Timer Corp.
- Page 46 DIRECT HEATING WIRING DIAGRAM MULTIPLE MODULATING BOILERS TWO 4-20mA MODULATING CONDENSING BOILERS AND TWO ON/OFF NON-CONDENSING BOILERS SYSTEM PUMP 4-20 mA SIGNAL OUTPUTS TWO VOLTAGE MODULATING CONDENSING BOILERS AND TWO ON/OFF NON-CONDENSING BOILERS SYSTEM PUMP VOLTAGE SIGNAL OUTPUTS HEAT-TIMER CORP. 059102-00 REV. C...
- Page 47 DISPLAY SHOWS AN INCORRECT TEMPERATURE Remove the wires from the sensor terminals. The display should change to read OPEN. If it does not, the Mini-MOD-CNC may be damaged. Take an ohm reading across the detached sensor wires. The ohm reading should correspond to the Temperature sensor Chart.
- Page 48 See “SETBACK” on page 32. • Boiler Mode Settings—The Mini-MOD-CNC will only control boilers their mode is set to Auto or Standby. Check if any boiler stage is set to Manual, Off, or Standby. See “MODE” on page 42. BOILERS ARE SHORT-CYCLING Lag Delay—Increase the Lag Delay only if modulating boilers tend to short-cycle.
- Page 49 SAVE When using the Mini-MOD-CNC in a BACnet MS/TP network, the use of BACnet Interface Module is required (P/N926781-00). In addition, each of the Boiler Type and Sensor Type Startup menu option will offer a different list of BACnet variables. See “BOILER TYPE”...
- Page 50 20 New Dutch Lane, Fairfield, NJ 07004 • (973)575-4004 PRODUCT DESCRIPTION Various controls for heating applications for multiple boilers. Includes Mini MOD, Mini MOD-CNC, SQ-8T ELITE, SQ-8S ELITE and SQ-MOV ELITE. (see https://www.heat-timer.com for more information) BACNET STANDARDIZED DEVICE PRO ILE (ANNEX L) PRODUCT...
- Page 51 ROTPER Hour 1440 Interger Write Purge Delay 1500 Analog Read / PURDLY Minutes 1 thru. 9 after Integer Values Write Only (1,2,3…) Lag Delay 1600 Analog Read / LAGDLY Minutes Integer Valves Only (1,2,...) Write 059102-00 REV. C HEAT-TIMER CORP.
- Page 52 2-Stage = 0%, 10%, 55%, 3-Stage = 0%, 10%, 30% , 55%, Modulating 3600 Analog Read MODC Percent 4-Stage = 0%, 10%, 30%, Output Only 55%, 80% Boiler C Modulating 3700 Analog Read MODD Percent Output Only Boiler D HEAT-TIMER CORP. 059102-00 REV. C...
- Page 53 4600 Analog Read MODM Percent Boiler M Only Modulating 4700 Analog Read MODN Percent Boiler N Only Modulating 4800 Analog Read MODO Percent Boiler O Only Modulating 4900 Analog Read MODP Percent Boiler P Only 059102-00 REV. C HEAT-TIMER CORP.
- Page 54 (6) 4–20mA, 0–5V, 0–10V, 1–5V, 2–10V Output Relay Ratings 1 Amp inductive (1/8HP), 6 Amp resistive at 120 VAC 60 Hz, 15A total for all circuits Connection to Mini-MOD-CNC and another extension Two RS485 connections using phone style cable (Cable is provided) HEAT-TIMER CORP.
- Page 55 Heat-Timer shall not be responsible for any maladjustments of any control installed by Heat-Timer. It is the users responsibility to adjust the settings of the control to provide the proper amount of heat or cooling required in the premises and for proper operation of the heating or cooling system.
- Page 56 20 NEW DUTCH LANE, FAIRFIELD, NJ 07004 PHONE: 973-575-4004 FAX: 973-575-4052 HEAT-TIMER.COM...
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