HeatNet Smith Series User Manual
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HeatNet Smith Series User Manual

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3187269
This manual is intended only for use by a qualified heating installer/technician. Read and follow this manual, all
supplements and related instructional information provided with the boiler. Install, start and service the boiler only
in the sequence and methods given in these instructions. Failure to do so can result in severe personal injury,
death or substantial property damage.
Do not use the boiler during construction. Construction dust and particulate, particularly drywall dust, will cause
contamination of the burner, resulting in possible severe personal injury, death or substantial property damage.
The boiler can only be operated with a dust-free air supply. Follow the instruction manual procedures to duct air to
the boiler air intake. If the boiler has been contaminated by operation with contaminated air, follow the instruction
manual guidelines to clean, repair or replace the boiler if necessary.
Affix these instructions near to the boiler. Instruct the building owner to retain the instructions for future use by a
qualified service technician, and to follow all guidelines in the User's Information Manual.
Smith
Modulating Hot Water Boilers
HeatNet
Control adjustment and operation
instructions for Smith firmware version
1.38
This instruction manual applies only to Smith
firmware version 1.38.
Also read and follow:
Smith Series Hot Water Boiler
Installation and Operating
Instructions
SHC-IOM-1
Series
®
manual

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Summary of Contents for HeatNet Smith Series

  • Page 1 1.38 This instruction manual applies only to Smith firmware version 1.38. Also read and follow: Smith Series Hot Water Boiler Installation and Operating Instructions 3187269 This manual is intended only for use by a qualified heating installer/technician. Read and follow this manual, all supplements and related instructional information provided with the boiler.

  • Page 2: Table Of Contents

    TABLE OF CONTENTS HeatNet Control REV 1.38-1 TABLE OF CONTENTS TABLE OF CONTENTS ..........................2 Introduction ..............................4 .............................. 4 MTIH ERIES ONTROL Features & Specifications ......................... 6 ..................................6 EATURES VERVIEW Specifications ............................7 Components & Accessories ........................8 SETUP &...

  • Page 3: Status Information

    ................................3 TATUS INFORMATION SCREENS Smith HeatNet Control Menu Tree — Smith Version 1.38 ..............68 Smith HeatNet Control Advanced Menu Tree — Smith Version 1.38 ............69 Worksheet ..............................70 Thermistor Resistance/Temperature Table .................... 73 Status Screen Fault Display ........................75 Line 4 Log Entries: ..........................

  • Page 4: Introduction

    BAND LIMIT WATER A. As a stand-alone boiler. TEMPERATURE B. A boiler in a Boiler Network using the HeatNet (H- Time Net ™) protocol. C. A member boiler controlled by a boiler management The control algorithm is based upon a Heat Band, at the system with multiple input control methods.
  • Page 5 FEATURES & SPECIFICATIONS HeatNet Control REV 1.38-1 the exact status of each Member boiler. When a new boiler In a stand-alone installation the Member typically receives its is added, the Master boiler adjusts the system modulation command signals internally and operates based upon the outlet...

  • Page 6: Features & Specifications

    21. Rotation Methods(Lead-Lag): True Rotation (based on boiler runtime)is default. First On First Off (FOFO), Distributed control using the HeatNet (H-Net) protocol and Last On First Off (LOFO) is an optional for up to 16 boilers. Eliminates the need for “wall programmable setting.

  • Page 7: Specifications

    FEATURES & SPECIFICATIONS HeatNet Control REV 1.38-1 Specifications Control Microprocessor based PID modulating control (NOT a safety limit ) Environment -40 F to 140 F, <90% RH non-condensing Input Power 24 VAC, 500 ma Relays System Pump, Damper, Circulator, Alarm, DHW Pump 8A 250 VAC resistive K8 on J4.1 &.2 for Base Loading and Dual Fuel 1/4 Amp...

  • Page 8: Components & Accessories

    FEATURES & SPECIFICATIONS HeatNet Control REV 1.38-1 Components & Accessories Part Number Component Smith-Series Control Board 02-4278 Graphics Display Board 02-3926 Temperature probe (bullet type, 1x.250 inch) ACI/10K-CP-BP 02-4283 Supply, Header, Return Sensors ACI 10k-CP-I-NW 02-4285 Sensor with well ACI CP-I-2.5”...

  • Page 9: Setup & Operation

    A basic multi boiler system typically uses boilers of the below the heating band and the ADD BOILER delay timer same size and type. With HeatNet, this includes (1) Master has counted down to 0, the process is repeated until the and (1-15) Member boilers.

  • Page 10: Mixed Boiler Types Using Priority Sets

    When a boiler is to be stopped (water temp is above the there is a fixed rate of BTUs (Min Fire) that will be heating band), the Master checks the HeatNet boilers it has removed (PID discontinuity to modulate from Min Fire available.

  • Page 11: Start/Stop Priority Conditions

    OPTIONAL FEATURES HeatNet Control REV 1.38-1 Figure 3 Mixed Boilers: Example: Condensing/Non-Condensing PRIORITY 1 PRIORITY 2 Condensing (Set) Non-Condensing (Set) Master FIRING MODE menu BOILER TYPE menu >MODE MIXED >FIRING PRIORITY (master boiler only) (all boilers in set) MIN RUNTIME:...
  • Page 12 SETUP & OPERATION HeatNet Control REV 1.38-1 2. The Outside Air Temperature is below an adjustable Start/Stop settings setpoint determined by the system configuration. This Any combination of Start Conditions and Stop Conditions setpoint ensures that the larger non-condensing boilers...

  • Page 13: Selecting Mixed Boilers

    SETUP & OPERATION HeatNet Control REV 1.38-1 the condensing boilers first. This is also true when using the OA T setting to start the priority 1 boiler set In order to achieve the high effective turndown, smaller boilers are required when the OA T is above the start setpoint.
  • Page 14 SETUP & OPERATION HeatNet Control REV 1.38-1 KN BOILER BTU CHART ). Next, the MOD-MAX value of Figure 6 Smith Boiler Btu Chart (MBH) this Priority 1 boiler needs to be greater than: 28A-W-5 28A-W-9 28A-W-14 28A-W-18 Mod MAX % =...
  • Page 15 SETUP & OPERATION HeatNet Control REV 1.38-1 Figure 9 Boiler System Response 1 Figure 8 Typical efficiency of non -condensing boilers (2) KN6’s, (2) 28A-W-5’s Blr 1+2 (1200 MBTU) Blr 1+2+3 (2356 MBTU) Blr 1+2+3 +4 (3512 MBTU) 1.00 0.90 0.80...
  • Page 16 SETUP & OPERATION HeatNet Control REV 1.38-1 Figure 10 Figure 12 Boiler System Response 2 Boiler System Response 4 (1) KN6’s, (1) 28A-W-5’s, 54% Mod-Max (2) KN6’s, (2) 28A-W-5’s, 85% Mod-Max Blr 1+2 (1756 MBTU) Blr 1+2 (1200 MBTU) Blr 1+2+3 (2356 MBTU) Blr 1+2+3 +4 (3512 MBTU) 1.00...

  • Page 17: Base Loading, Relay Control

    Using the Smith HeatNet control on one Smith series boiler Figure 13 Base loading with Smith Boilers can allow a second Smith series boiler or other boiler type to be controlled using the base load feature. Master Base load...

  • Page 18: Setting Up Base Loading

    SETUP & OPERATION HeatNet Control REV 1.38-1 qualifier; Modulation to 40% or a low fire rate will shut the off its limits, whether a 2 stage, Hi/Lo, or modulating boiler. Base Load boiler off and allow the (3) smaller boilers to The default setting is for the Base Load boiler to stop first modulate up again (short cycle of the Base Load boiler;...
  • Page 19 OPTIONAL FEATURES HeatNet Control REV 1.38-1 3. Return Water Temperature Setting up base loading a. START menu item: The relay contact will close The base load boiler is controlled using a set of contacts to to enable the boiler when the RET read from the enable it (location J4).

  • Page 20: Heating Control Methods

    Heating Method 1 supply temperature increases above the (OPERATE LIMIT- OPERATE LIMIT The first method is to use the Smith Series boiler in its stand- BAND). alone modulating method. This method uses a PID algorithm to maintain a setpoint and is enabled using the HEAT Operating Limit DEMAND input.

  • Page 21: Heating Method 1 Heat Demand

    Mod Motor, which in turn controls the damper position Priority 3 and fuel rate. providing the firing rate control. If a HeatNet (H-Net) Network cable is connected between boilers, and one is configured as a MASTER (requires Member boiler(s) HEADER sensor), then the MEMBER boilers will be controlled over the network by the MASTER.

  • Page 22: Stage Control T1-T2

    CONTROL METHODS HeatNet Control REV 1.38-1 The AA terminal, the HEAT DEMAND, and the H-Net Heating Method 2 NETWORK are the only inputs that will override the 4-20ma STAGE Control T1-T2 input. Closing only one of these contacts tells the boiler to Heating Method 4 operate at MINIMUM FIRE.

  • Page 23: Using The 4-20Ma Input (Optional)

    OPTIONAL FEATURES HeatNet Control REV 1.38-1 Protocessor option Figure 21 4-20mA Enable Connection An optional BACnet or LonWorks bridge module can be used to connect the MODBUS network to a BACnet or LonWorks network. Figure 19 MODBUS Connections The 4-20 ma input uses a 250 ohm sense resistor to convert the current to a voltage from 1 to 5 volts DC for the control to use.

  • Page 24: Circulator Pump Options

    System Water Flow on J5B. If a local flow switch is the control, these values return to these connected to the WTR FLW LOCAL interlock, the HeatNet defaults. control will wait up to 240 seconds to prove flow. This time is adjustable under SETUP:PUMP OPTIONS.

  • Page 25: Auxiliary Function Options

    SETUP:AUX FUNCTIONS:COMBUST AIR DAMPER pump/valve unless it is running. menu. Another feature of the HeatNet Control is to control a local Outdoor Reset (primary) pump using a Variable Frequency Drive. This feature may be required when a secondary system pump is also variable speed.

  • Page 26: Sensors

    DHW heating. If the Master controls the system pump, then the Failsafe Member The Smith HeatNet control can display and identify faults in a boiler would need to control the system pump in parallel meaningful way.

  • Page 27: Additional Features

    LOCAL of the system in the event that communications are lost setpoint. Once the Boiler reaches it’s setpoint it will turn with the BMS system. The HeatNet boiler system will OFF. run locally if communications is lost and this timer expires due to the lack of being updated.

  • Page 28: Domestic Hot Water Methods

    (DHW SETPOINT – DHW DIFF). The first boiler is started The HeatNet control supports Domestic Hot Water control immediately. The next boiler(s) is started after the ADD using (4) methods. When using the Domestic Hot Water BOILER DELAY time expires.

  • Page 29: Dhw Method 1B: Combo Dhw And Space Heating Using A Master Boiler And Member Boiler(S) Employing H-Net

    OPTIONAL FEATURES HeatNet Control REV 1.38-1 above the setpoint temperature. Care should be Change the DHW SETPOINT to the desired taken here. target temperature of the water in the tank. Once the control determines there is a call for DHW,...

  • Page 30: Dhw Method 2: Dhw Header Sensor Input

    OPTIONAL FEATURES HeatNet Control REV 1.38-1 MASTER will automatically call on other boilers Now, there is one more thing to consider, the when the DHW Tank Temperature drops below pump’s post purge time. Dumping the heat from (DHW SETPOINT – DHW DIFF) even when no all boilers (that were running) using a pump post Heat Demand signal is present.

  • Page 31: Dhw Method 4: Dhw Using Direct Control

    Member. When the Option input switch is open, the Solid State The Smith HeatNet control allows selection of interlocks Relay (K8) has its contacts open on J4, between pins 1 to monitor. An interlock can be monitored by connecting a and 2.
  • Page 32 Next, a chirping will be heard which indicates the The HeatNet control supports a flash drive for loading process of burning the new firmware code into the firmware. This is in addition to the loading of firmware control’s microcontroller.

  • Page 33: Wiring Connections

    WIRING CONNECTIONS HeatNet Control REV 1.38-1 Wiring Connections Figure 26 Power Connections Page 33...
  • Page 34 WIRING CONNECTIONS HeatNet Control REV 1.38-1 Figure 27 Heating Method 1 H-Net Master/Member Close this contact to override the Outdoor Reset slope and run at the Domestic Hot Water Setpoint. The DHW Pump NO contact will also close. Page 34...
  • Page 35 WIRING CONNECTIONS HeatNet Control REV 1.38-1 Figure 28 Heating Method 2 and 4: AA-High Fire and High/Low Master or Member Boiler HI/LO NO 1 AMP 4-20mA 24VAC TRANSFORMER Unused WTR FLW LOCAL MODULATION CONTROL 0-10 4-20ma SIP1 EXT OPERAT PWM/0-10...
  • Page 36 WIRING CONNECTIONS HeatNet Control REV 1.38-1 Figure 29 Heating Method 3 – 4-20mA 24 VDC 4-20 mA/0-10 VDC - Modulation Control Input 4-20mA/0-10 VDC + 24 VDC Return 4 - 2 H I / L O N O 1 A M P...
  • Page 37 WIRING CONNECTIONS HeatNet Control REV 1.38-1 Figure 30 Heating Method 5 MODBUS (Optional BACnet or LonWorks bridge) 4 - 2 H I / L O N O 1 A M P 4 - 2 0 m A 2 4 V A C T R A N S F O R M E R...
  • Page 38 WIRING CONNECTIONS HeatNet Control REV 1.38-1 Figure 31 Relays, Interlocks and Boiler Status Interlocks 1. Connect a wire after the boiler interlock to the interlock terminal. Inputs are 120 vac. USB Firmware 2. Enable the interlock to monitor it in the...
  • Page 39 WIRING CONNECTIONS HeatNet Control REV 1.38-1 Figure 32 Temperature Sensors Page 39...
  • Page 40 WIRING CONNECTIONS HeatNet Control REV 1.38-1 Figure 33 Controlling the Mod Motor Modulation Control Outputs The figure shows the (2) methods for controlling a modulation actuator. Relay K8 NO Contact. For Actuators that utilize a 4-20 mA For Actuators that utilize a 135 ohm 1.
  • Page 41 WIRING CONNECTIONS HeatNet Control REV 1.38-1 Figure 34 Typical Single Boiler System HEADER SENSOR (Determines Master Boiler) #4 SYSTEM PUMP LOCAL PUMP OUTDOOR ENABLE #14 DHW TANK ENABLE #8 SENSOR FLOW PROVE #9 AQUASTAT FLOW PROVE North Away From Exhaust...
  • Page 42 WIRING CONNECTIONS HeatNet Control REV 1.38-1 Figure 35 Common System Damper Wiring MEMBER BOILER 2 MEMBER BOILER 1 Connection if Member boiler is running as Failsafe MASTER BOILER NOTE: Ensure that the Combustion Air Damper is enabled on all Boilers for use.
  • Page 43 WIRING CONNECTIONS HeatNet Control REV 1.38-1 Figure 36 Failsafe Common System Pump Wiring System Flow Prove MEMBER BOILER 1 System Flow Prove 120VAC AFTER FLOW SWTICH System Flow Prove Switch 120VAC MASTER BOILER 120 Return 120VAC System Pump Voltage Return...

  • Page 44: Calibration

    CALIBRATION HeatNet Control REV 1.38-1 Press the arrow keys until MIN VFD is shown in the Calibration display, along with the minimum percentage value at which the boiler is to run at min fire. While in Standby (no call for heat on inputs), the minimum percent may be A detailed startup and walkthrough of the calibration and H- preset.

  • Page 45: Log Entry

    If NC = No Call for Heat the system is configured to run with HeatNet, then only the HD = Heat Demand (MASTER and Local modulation Master boilers SYSTEM TIME needs to be entered. The control using PID control, MASTER and Master will then set the time on all Member boilers.

  • Page 46: Default Settings & Menu Item Descriptions - Setup

    DEFAULT SETTINGS & MENU ITEM DESCRIPTIONS HeatNet Control REV 1.38-1 Default Settings & Menu Item Descriptions — SETUP DEFAULT DESCRIPTION MENU RANGE VALUE BOILERS # OF BOILERS (1-16) If operating as a member. LEAD BOILER # (0-16) # of first boiler to run, determines the fire order in rotation. A # of first boiler to run, determines the fire order in rotation.
  • Page 47 DEFAULT SETTINGS & MENU ITEM DESCRIPTIONS HeatNet Control REV 1.38-1 LOCAL PUMP ON: Use Delta temperature to shut pump off when DELTA TEMP ENAB temperature across boiler is less than DELTA TEMP setting. DELTA TEMP 10 ° F (2 - 50 ° F)
  • Page 48 DEFAULT SETTINGS & MENU ITEM DESCRIPTIONS HeatNet Control REV 1.38-1 AUX FUNCTIONS COMBUST AIR DAMPER The LINKED/COMMON setting allows one common damper to be used and controlled by the Master Boiler. All Member boilers must have their damper prove inputs wired as per Error! LINKED/COMMON Reference source not found.
  • Page 49 If set to YES, this boiler becomes the DHW Master Boiler DHW MASTER? and will use HeatNet to control member boilers based on the DHW Sensor, DHW SETPOINT, and DHW DIFF. If set to NO, only this boiler will run in DHW mode.

  • Page 50: Default Settings & Menu Item Descriptions - Advanced Setup

    Default Settings & Menu Item Descriptions — ADVANCED SETUP DISTRIBUTED CTRL CONTROL H-Net Displays method of operation: HeatNet (H-Net) Auto detected, based on the HEADER sensor. If the HEADER sensor is present and is set to TYPEZ, the H-Net MASTER Smith-Series control is run as a H-Net MASTER (YES).
  • Page 51 DEFAULT SETTINGS & MENU ITEM DESCRIPTIONS HeatNet Control REV 1.38-1 ADAPTIVE MOD If MODulation MODE is set to ADAPTIVE on the Master boiler, the Master lowers the system modulation rate of all currently running boilers before a newly started boiler enters the Main Valve state.
  • Page 52 PRIORITY NORMAL level (same as the AA input). This method may be used by an external control to override the HeatNet control and fire the boiler using this external control (external control override). This allows for complex DHW control systems.
  • Page 53 FACTORY CAL? MIN VFD, MAX VFD and IGN VFD. Selecting YES will load all factory defaults except the FACTORY RESET? Calibration values, HeatNet, and Modbus addresses. SYSTEM BOILER TYPE There are (2) Priority settings used by the MIXED boiler rotation algorithm. Priority 2 is the default and lowest priority.

  • Page 54: Modbus Communications

    COMMUNICATIONS HeatNet Control REV 1.38-1 MODBUS Communications The Smith-Series control can be controlled using Modbus commands to Enable/Disable the boiler/system. A connection to the Console Modbus Port on the Communications board is required. The Master Boiler assumes the role of MEMBER, RTU, 192Kb, 8 bits, Even Parity, 1 stop bit, when connected to a BMS (Building Management System).
  • Page 55 COMMUNICATIONS HeatNet Control REV 1.38-1 Figure 38 MODBUS Input/Output Variables (Read/Write) Description Valid Address Name Raw Data Type Scale Values/Range 40013 SetHour 8 bit unsigned Set real time clock – hour ( see SetClock ) 0 – 23 40014 SetMinute 8 bit unsigned Set real time clock –...
  • Page 56 COMMUNICATIONS HeatNet Control REV 1.38-1 Figure 39 MODBUS Input Variables (Read Only) Raw Data Address Name Scale Description Valid Values/Range Type 30017 Boiler01Status2 unsigned bits indicate the state of the and “BoilerStatus2” Tables 24VAC interlocks, ignition circuit, below. 30018 Boiler02Status1 and various other conditions.
  • Page 57 COMMUNICATIONS HeatNet Control REV 1.38-1 Figure 39 MODBUS Input Variables (Read Only) Raw Data Address Name Scale Description Valid Values/Range Type 30075 Boiler14RuntimeLow16 30076 Boiler15RuntimeHigh16 30077 Boiler15RuntimeLow16 30078 Boiler16RuntimeHigh16 30079 Boiler16RuntimeLow16 30080 Boiler01Status3 30081 Boiler02Status3 30082 Boiler03Status3 30083 Boiler04Status3 30084...
  • Page 58 COMMUNICATIONS HeatNet Control REV 1.38-1 Figure 39 MODBUS Input Variables (Read Only) Raw Data Address Name Scale Description Valid Values/Range Type 30133 Boiler03CyclesLow16 be combined (concatenated) into a single 32 bit counter as: 30134 Boiler04CyclesHigh16 30135 Boiler04CyclesLow16 Boiler##CyclesHigh16:Boiler##Cyc 30136 Boiler05CyclesHigh16...
  • Page 59 COMMUNICATIONS HeatNet Control REV 1.38-1 Figure 41 MODBUS — BoilerStatus2 Flags Description Valid Values/Range Disabled 0 = enabled, 1 = disabled Heat Demand 0 = no demand, 1 = demand (1) Alarm 0 = ok, 1 = alarm Failed 0 = ok, 1 = failed...
  • Page 60 COMMUNICATIONS HeatNet Control REV 1.38-1 Figure 42 MODBUS — BoilerStatus3 Flags AA High Fire 0 = off, 1 = on Heat Demand (Local Override) 0 = off, 1 = on (1) 4-20ma Remote Enable 0 = off, 1 = on...

  • Page 61: Troubleshooting

    TROUBLESHOOTING HeatNet Control REV 1.38-1 Situation: Troubleshooting The display is displaying random characters or the control keeps resetting. This section is included as an aide to help troubleshoot There may exist a grounding problem with the controller or problems with the setup and operation of the boiler. See one of the boilers, pumps, contactors or other devices Appendix A for additional fault messages.
  • Page 62 TROUBLESHOOTING HeatNet Control REV 1.38-1 Situation: Situation: The boilers menu only indicates 1 boiler, but there Only the MASTER boiler Fires, but the system has are member boilers connected and the amber light many boilers and is using H-Net. blinks on all of the boilers communication’s jacks.
  • Page 63 %. Check blink on HeatNet Jacks. Only one Master boiler. if the ignition control is in standby, if so then the HeatNet control has closed the Start contact on J5..10 (Limits) and...
  • Page 64 ADVANCED SETUP- Check the wiring. The Modbus RTU (RS485) >COMMUNICATIONS menu. connections on the HeatNet control are A(+), B(-), and G (ground). Some systems use opposite polarity; A(-), B(+). Always use the polarity to determine the proper connections.

  • Page 65: Smith Heatnet Control Run Screen

    OPERATION HeatNet Control REV 1.38-1 Smith Series Run Screen Page 65...
  • Page 66 OPERATION HeatNet Control REV 1.38-1 * Status Information Whenever an * is displayed on the RUN screen it indicates that there is more information available about the current running conditions. This information can be viewed by going to the *STATUS screen as shown on the previous page. For more information on the parameters discussed here please see the Default Settings &...
  • Page 67 OPERATION HeatNet Control REV 1.38-1 Status information screens This screen indicates the control is attempting to re-initiate the ignition control because the ignition control did not begin PRE-PURGE. For more information see CALL SERVICE LOG entry. This screen indicates that the boiler’s has received a heat demand, but it’s MINIMUM...

  • Page 68: Smith Heatnet Control Menu Tree - Smith Version 1.38

    OPERATION HeatNet Control REV 1.38-1 Smith Series Menu Tree Version 1.38 Page 68...

  • Page 69: Smith Heatnet Control Advanced Menu Tree - Smith Version 1.38

    OPERATION HeatNet Control REV 1.38-1 Smith Series Advanced Menu Tree Version 1.38 CONTROL H- NET CTRL DISTRIBUTED H- NET MASTER MODULAR BOILER SET H-NET ADDRESS ADAPTIVE MOD MODBUS ADDRESS FIRING MODE ADD BOILER DELAY ADD DELAY TIME SHED BOILER DELAY...

  • Page 70: Worksheet

    WORKSHEET HeatNet Control REV 1.38-1 Worksheet SETUP MENU BOILERS # of BOILERS LEAD STAGE HEAT BAND ° SETPOINTS LOCAL SETPOINT ° OPERATE LIMIT ° OP LIM BAND ° SETPOINT SOURCE OUTDOOR AIR RESET ° OA RESET WARM WEATHER SD WWS SETPOINT °...
  • Page 71 WORKSHEET HeatNet Control REV 1.38-1 TYPE: IN USE? INPUT: PROOF TIME ALARM SILENCE SWITCH IN USE INPUT: FAILSAFE MODES H-NET COMM LOST LOW TEMP: TEMP < HEAT EXCHANGER EXCHGR DELTA T 40F LIM-> HALF RATE DHW SETPOINT DHW DIFF USE SENSOR?
  • Page 72 WORKSHEET HeatNet Control REV 1.38-1 ADVANCED SETUP DISTRIBUTED CTRL CONTROL H-Net MASTER H-NET ADDRESS MODBUS ADDRESS MODULAR BOILER SET ADD BOILER DELAY SHED BOILER DELAY MODULATE DELAY TIME MOD MAX – LAST FIRE ADAPTIVE MOD MOD MODE: DROP DOWN DELAY RELEASE...

  • Page 73: Thermistor Resistance/Temperature Table

    TEMPERATURE REFERENCE HeatNet Control REV 1.38-1 Thermistor Resistance/Temperature Table Resistance Resistance Temp ° C Temp ° F Temp ° C Temp ° F 336,450 2,488 242,660 2,083 176,960 1,752 130,410 1,479 97,072 1,255 72,951 1,070 55,326 915.4 43,326 786.6 32,650 678.6...
  • Page 74 TEMPERATURE REFERENCE HeatNet Control REV 1.38-1 RTD Stack Sensor Resistance/Temperature Table Temp ° C Temp ° F Resistance Temp ° C Temp ° F Resistance Temp ° C Temp ° F Resistance 1,000 1,693 2,352 1,017 1,714 2,371 1,039 1,734...

  • Page 75: Status Screen Fault Display

    The interlock is located on J15B, GAS PR. SYSTEM WATER FLOW: Once the HeatNet series boiler receives a call for heat, it The high limit interlock breaks power to the ignition control closes the system circulator pump relay. It then waits 10 (shutting it off) and effectively removes any chance of the seconds or more (adjustable) to prove flow.
  • Page 76 HeatNet Control REV 1.38-1 WTR FLW LOCAL: OPEN ******* SENSOR : Once the HeatNet series boiler receives a call for heat, it If the open sensor fault is displayed, the sensor in the closes the LOCAL PUMP/VALVE relay. It then waits 10 position reported was originally detected, but has since seconds or more (adjustable) to prove flow.
  • Page 77 APPENDIX A HeatNet Control REV 1.38-1 AIR SWITCH: CALL SERVICE: If the IGNITION control closes its blower relay, the control If the H-Net control closes the last interlock string entering does not see the PILOT relay close within (2) minutes, and...

  • Page 78: Line 4 Log Entries

    APPENDIX B HeatNet Control REV 1.38-1 Line 4 Log Entries: The following table lists the messages on line # 4 of the log’s display. Line # 4 Message Description SETBACK IS ACTIVE If any of the (4) temperature setbacks are active these log entries will SETBACK EXPIRED be displayed in the log.
  • Page 79 APPENDIX B HeatNet Control REV 1.38-1 Line # 4 Message Description LOW RETURN TEMP ° If the return temperature is less than 130 degrees F condensing may be occurring. After 24 hours of continuous runtime the ignition control module needs to check it’s UV detection circuit. An orderly shutdown and SHUTDOWN UV TEST then a restart will occur.
  • Page 80 HeatNet Control REV 1.38-1 Line # 4 Message Description If a call is made to the ignition control to start and the HeatNet control AIR SWITCH(BLOWER) detects a blower start, but no Pilot within two minutes, the boiler locks out. This log entry indicates that the blower was ON with no flame in the boiler.
  • Page 82 Smith 260 North Elm Street Westfield MA 01085...

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