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KN-2_4-CM2-808 Hydrotherm.indd

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1. ENA 4 ENA px ENA ENA The resistive load across the 24mA O 4 20mA source is 250 ohms per boiler Input P N 42 9452 8 08 Copyright Hydrotherm KN USER S CONTROL MANUAL Method 3 External 4 20ma control continued Figure 17 KN wiring summary wiring to electrical connection board continued see Figure 7 page 9 for terminal strip locations O 5 External high limits low water cut offs or other limits if used a eae 24VAC INTERLOCKS s o a E _ a BYPASS CIRC ALARM HIGH FLOW USER 120V LIMIT SWITCH INTRLK Water flow switch if used Remove factory jumper across FLOW SWITCH terminals when using a flow switch E A A M a M a M SQ Factory wiring DO NOT change 120 VAC 120 VAC gom m J Postpurge z circulator KN 2 only This circulator is factory pipe and wired It circulates water in the boiler after shutdown to prevent overtemperature in the top of the boiler DO NOT remove or use in any other manner It cannot be used for system circulation Dry contact out to remote alarm Alarm contact closes on open or shorted sensor ignition lockout flow switch or user interlock combustion air damper failure blocked flue or blocked air inlet ONO Om H ovac Fused service switch by installer Power to n Circulator Gnd DO NOT directly connect circulator if motor is over 1 4 HP Use a motor co
2. COMMUNICATIONS LOAD DEFAULTS ADVANCED SETUP Load the factory defaults when you want to be sure nothing has been changed or after you have loaded new firmware 1 Disconnect wires to the Heat Demand terminals and any other remote operation wiring There must be no call for heat during the process Navigate the control display to LOAD DEFAULTS To restore factory calibration settings or factory settings section either of the options and select YES for the prompt ARE YOUR SURE FIRMWARE VERSION UPDATE CONTROL ADVANCED SETUP The firmware version in the control must match the version in this manual in order to ensure SYSTEM accuracy of the installation operation information The control displays the firmware version number when Setup is accessed To update the control s firmware obtain a disk from HydroTherm 1 Disconnect wires to the Heat Demand terminals and any other remote operation wiring There must be no call for heat during the process Record all setup information for the application before proceeding Insert the Firmware Update Program disk into the computer The program will start and show an option screen Select Install USB Drivers to install the program onto the computer After the USB driver installation is complete select Install Firmware Update Plug a USB cable into the control connection board with the other connected to the computer THE CABLE MUST BE CONNECTED BEFORE STARTI
3. KN components KN USER S CONTROL MANUAL The KN boiler with HeatNet control P N 42 9452 8 08 Copyright Hydrotherm KN USER S CONTROL MANUAL Contents 1 Method 1 HeatNet modulation control page 6 The KN HeatNet control can control up to 16 KN boilers using built in software and hardware Install a RS485 interface on each boiler and connect with RJ4S HeatNet cables or shielded wires The header water temperature setpoint can be set by the master boiler or by a 4 20ma input from an external controller Member boilers can override master boiler control if they receive a contact closure on the Heat Demand or DHW Demand terminals 2 Method 2 HeatNet modulation BMS page 14 This method uses the KN control built in communications capabilities to accept Modbus protocol inputs from a building management system The master boiler con trol sequences and modulates the boiler network to accomplish the demands from the building management system Each boiler requires the RS485 interface board and cable above Boiler setup is essentially the same as for method 1 with the exception that each boiler must be assigned both a HeatNet network address and an address for the Modbus in terface An additional bus is required to interface with systems using BACnet or LonWorks protocol The master boiler will take control and regulate the boiler network if signal from the BMS is lost or times out 3
4. POWER SERVICE Electrical connection board Located in center panel on boiler right side 15 amp fused FR 2 The boiler is shipped with a jumper across the HEAT DEMAND terminals Remove this jumper when using a a 3 thermostat or other external control to start the boiler sea y i 120VAC 60HZ 1Ph Power to boiler ai a atl m a mn eran e en 4 20mA REMOTE HEAT DHW LOW HIGH ENABLE DEMANDIDEMAND FIRE FIRE LUJ Use these terminals only during boiler setup as given in the Boiler manual Use ONLY if wiring and piping for Override mode DHW tank aquastat when used A DHW circulator and circulator relay will be required Start the DHW circulator on call for heat To remote controller from the tank aquastat enable a Ea l contact Use ONLY if wiring and piping for Override mode Connect thermostat zone valve end switches or remote start relay contact here Test when done to ensure no stray voltage is present on any of the wires See the Boiler manual for procedure 1 per boiler 4 20mA input Bir signal see right for wiring Bir 2 4 iin A j i j Kr i 1 S i q 1 Au t q 4 o_o n T b MER N Bir 3 Bir 4 Bir 5 a i aii o te i k 4 i H t 4 j i poi k eed 7 PPS h 7 7 oe E i al s a nm ii 4 20mA REMG 4 20mA REMG 4 20mA REMG 4 20mA REMG 4 20mA REMG DF ia ENA z
5. Ifthe control does not sense a closed circuit at input connection FLOW SWITCH check to make sure the WATER FLOW SWITCH or WAITING circuit for the circulator pump is correct that the pump is being energized and that the flow prove switch FOR FLOW is working properly Q If there is no flow prove switch check to make sure that a jumper wire has been connected across the FLOW SWITCH terminals You have forgotten the password Turn the ON OFF switch off Then depress and hold the ESC key while turning it back on This will load the default password AAAAAA Firmware update program starts L Ensure that the USB driver for your PC Laptop computer is properly installed to load but then stops Hydro Therm 4 vs A MESTEK COMPANY IN UNITED STATES 260 NORTH ELM ST WESTFIELD MA 01085 413 564 5515 FAX 413 568 9613 IN CANADA 7555 TRANMERE DRIVE MISSISSAUGA ONT L5S 1L4 905 672 2991 FAX 905 672 2883 www hydrothermkn com P N 42 9452 8 08 Copyright Hydrotherm
6. KN 2 only The circulator shipped installed with the boiler can not be used for system circulation It must be used as supplied from the factory It circulates water after the boiler stops firing to prevent potential damage from heat pocketing in the top of the heat exchanger The postpurge circulator is factory piped and pre wired Do not change the usage the wiring the location or the piping Boiler circulator See the Boiler manual for circulator piping Figure 13 Figure 14 and Figure 15 show wiring of the Boiler circulator or boiler system circulator to the terminal strip of the KN 2 electrical connection board DO NOT directly connect a circulator with a motor larger than 1 4 hp For larger motors install a circulator relay or motor contactor Figure 13 and Figure 14 show the correct ways to install the boiler circulator using a relay or motor starter Figure 13 Wiring the boiler circulator using a circulator relay required for motors over 1 4 hp 120VAC 60HZ 1Ph Circulator relay with internal 24VAC transformer Boiler circulator or boiler system circulator 120 VAC 20209 Figure 14 Wiring the boiler circulator using a relay or starter required for motors over 1 4 hp 120VAC 60HZ 1Ph Relay or motor starter with 120VAC coil Boiler circulator or boiler system circulator 120 VAC 20210 P N 42 9452 8 08 Copyright Hydrotherm Figure 15 Circulator w
7. 0 Disabled Off 1 Enabled On 40005 Outdoor Air Setpoint 40 F 100 F 40006 Water Temperature at High Outside Air 60 F 150 F 40007 High Outside Air Temperature 50 F 90 F Description 40008 Water Temperature at Low Outside Air 70 F 220 F 35 F 40 F 40012 Unsigned Set Clock Year 0 9 40016 Set Clock Day of Week 2 1 Monday 7 Sunday 40017 Unsigned Set Clock After the Set Clock Registers listed 1 above have been written a 1 must be written to this location to set the clock 2 Table 4 Boiler status flags Disabled Local Override Fal Software Operator S Bit Bit o 6 PumpRuming 2 8 OWCOInterock 2 9 VEDInterok f 25 Operator Interlock ToS Water Prove Flow Interlock 29 Air Prove UV Sensor Interlock Present Boiler Detected P N 42 9452 8 08 Copyright Hydrotherm KN USER S CONTROL MANUAL 2 BACnet or LonWorks protocols l Install the correct bridge to adapt to building management systems using BACnet or LonWorks protocols The bridge translates the BACnet or LonWorks input to the Modbus protocol for compatibility with the HeatNet controls Wiring and set up l Wire and set up the master boiler and member boilers exactly as for HeatNet modulation local control applications See page 6 through page 13 ALL control parameters must be set up just as for the local control method The ONLY difference in setup is th
8. 4 Switch 1 Switch 2 Switch 3 Switch 4 Switch 1 Switch 2 Switch 3 Switch 4 Other members Switch 1 Switch 2 Switch 3 Switch 4 Priority 3 HeatNet input Note Modbus setup is for applications controlled by a building management system For systems using BACnet or LonWorks a bridge board is used to interface with the KN 2 control The switch is on when in the down position and off when in the up position Set termination DIP switches 1 The HeatNet network needs to recognize the beginning and end of the network This requires setting the four DIP switches on each boiler s electrical connection board See Figure 9 for location of the switches See Table 1 for required settings The table gives settings for HeatNet modula tion local control and for remote control from a building management system Modbus protocol 4 DO NOT connect the communications cables or shielded wires between boilers until all boilers have had parameters set and then been started up following all in structions in the KN Boiler manual P N 42 9452 8 08 Copyright Hydrotherm KN USER S CONTROL MANUAL l Method 1 HeatNet modulation local control von Table2 Control parameters Close the external manual gas valve on every boiler before proceeding DO NOT open any gas valve or attempt to fire any Parameter Master Member boiler until the boilers have been set up and verified following boiler boiler t
9. ADVANCED SETUP This is used only when the boilers are regulated by a building management system using DISTRIB CTRL MODBUS BACNET or LONWORKS Assign each member boiler AND the Heat Net master boiler a unique address an value from 1 to 247 ADD BOILER DLY ADVANCED SETUP This is the minimum wait time before an additional boiler can fire when called on by the master MODULAR BOILER boiler control SHED BOILER DLY ADVANCED SETUP This is the minimum wait time before a boiler can shut down by the master boiler control MODULAR BOILER P N 42 9452 8 08 Copyright Hydrotherm 4 KN USER S CONTROL MANUAL Control menus and adjustments continued Table 8 Setup menus parameter explanations continued ADVANCED SETUP MODULAR BOILER MOD DELAY TIME ADVANCED SETUP MODULAR BOILER MOD MAX LAST STOP BAND OFSET ADVANCED SETUP MODULAR BOILER ADVANCED SETUP MODULAR BOILER BLR START TIME ADVANCED SETUP MODULATION PID P ROPOR ADVANCED SETUP MODULATION PID I NTEGRAL ADVANCED SETUP MODULATION PID D ERIVAT ADVANCED SETUP MODULATION PID BAND ADVANCED SETUP FIRING MODE ROTATION ADVANCED SETUP FIRING MODE MASTER 1ST ADVANCED SETUP SENSORS ADVANCED SETUP SENSORS TYPE ADVANCED SETUP SENSORS CALIBRATE The boiler will remain at minimum fire when first starting until this amount of time has elapsed This sets the maximum firing percentage for boilers during
10. ALWAYS ON is set to YES the boiler circulator never turns off MASTER PUMP PUMP OPTIONS If set to ON the master control in the network will keep its pump contacts closed running its pump and or control valve if no other boilers are operating This is used to prevent dead PURGE TIME PUMP OPTIONS The boiler pump can run after boiler shutdown to distribute heat remaining in the boiler water PURGE TIME sets how long the boiler pump will run Also see DELTA TEMP above NOTICE For systems that shut off flow valves such as zone valve systems when the call for heat is satisfied heading system flow SETBACK NIGHT SETBACK Setback number is the designator for the setback operation Up to four 4 setback operations can be programmed P N 42 9452 8 08 Copyright Hydrotherm KN USER S CONTROL MANUAL 4 Control menus and adjustments continued Table 8 Setup menus parameter explanations continued ENTRY IS NIGHT SETBACK Select ON to enable a setback operation Then program the times days and setpoint The setpoint assigned will override the KN control s setpoint when setpoint is controlled locally It will not override 4 20ma control or building management control TEMP SCALE Select Fahrenheit or Centigrade KEY CLICK If activated the control beeps when a key is pressed The control can be programmed such that a password is required to change settings Setting this to ON disables the password
11. The display shows combustion air damper failure The display is displaying random characters or the control keeps resetting There are no heating boilers on Unable to change the of Boilers in the BOILERS menu The BOILERS menu only indicates one boiler but there are member boilers connected The amber light blinks on all of the boilers communication s jacks P N 42 9452 8 08 Copyright Hydrotherm E E E Check 120VAC power to connection board Verify power is connected per wiring diagrams The Power switch light ON Position should illuminate if power is wired correctly Ifthe Ignition Control is active but the front panel display is inactive check 1 Cable and cable polarity from the control board to the display 2 Check for 120vac on the primary of the transformer and 24vac on the secondary If one of the 24vac interlocks has been shorted to ground or the 24vac output is low the transformer may be damaged or a 24vac circuit may be miswired The KN control is equipped with resettable fuses on the power input circuit Wiring power incorrectly to the unit will cause these fuses to open Once the incorrect wiring is corrected the fuses should reset themselves in less than 5 minutes If you are not using the combustion air damper then it needs to be disabled in the AUX FUNCTIONS menu The prove switch for the combustion air damper is not closing Check to make sure the dampers are being controlled by the output rela
12. U U Un Return Temperature Spare Input 2 Clock Month Clock Day Clock Hours Clock Minutes Clock Seconds Clock Day of Week Boilers 1 16 status flag 32 bit registers The upper 16 bits of each 32 bit register is stored at odd numbered addresses 30016 30046 The lower 16 bits of each 32 bit register is stored at even numbered addresses 30017 30047 Boilers 1 16 runtime 32 bit registers The upper 16 bits of each 32 bit register is stored at odd numbered addresses 30048 30078 The lower 16 bits of each 32 bit register is stored at even numbered addresses 30049 30079 When the upper and lower registers are combined they form a 32 bit unsigned integer that is the number of seconds that the boiler has been running For instance Register 29 65536 Register 30 Boiler 1 runtime in seconds Boiler 1 is the master boiler Boilers 2 16 are member boilers Clock Year Outside Air Temperature 40 250 Spare Input 1 32768 to 32767 32768 to 32767 0 59 1 Monday 7 Sunday 1 F F 32 250 F F 31 See the Boiler Status Flags Table Below 0 4294967295 seconds KN USER S CONTROL MANUAL WARNING Electrical shock hazard Disconnect all electrical power sources to the boiler before making any electrical connections Label all wires prior to disconnection when servicing controls Wiring errors can cause impro
13. instead If the master is functioning correctly the yellow LED s on the H Link jack ports will blink The blinking indicates that the master is trying to communicate with member boilers If a FAULT message is displayed clear the faults until the STANDBY message is displayed Refer to troubleshooting suggestions at the end of this manual if you cannot resolve the issue Member boiler cables Begin with the first member boiler Plug the other end of the master boilers communications cable to the member boiler s input port Figure 10 page 13 item 2 for RJ45 cable or item 4 for 3 wire cable Connect cables to all of the member boilers by cabling from one to the next Connect incoming cables to item 1 or 4 Figure 10 page 13 Connect outgoing cables to item 2 or 4 Note that shielded cable wires will share terminals when using item 4 Check the network l 2 3 4 D PN DD Turn the power on and the on off switch to ON for all of the member boilers Allow time for each boiler to initialize After about 30 seconds the master boiler should recognize the member boilers m wy Navigate to the BOILERS menu then to HEAT HEAT HET BOILERS NET BOILERS display The master control will show the boilers it recognizes Values from 10 to 15 will display as letters 10 A 11 B 12 C 13 D 14 E and 15 F If the display shows a blank space such as 123_56789ABC the control does not detect the missing boiler boiler 4 Check
14. the transformer to be shorted out and damaged Verify the wiring with a voltmeter CAUTION Always use a voltmeter to check the leads coming from the end switches of the zone valves With the thermostat calling for heat connect the voltmeter leads across the wires coming from the end switches If the meter shows a voltage reading the zone valve wires are incorrect Change the wiring and retest DO NOT connect the wires to the boiler until you have tested as described Incorrect wiring can damage the boiler control or other system components If there is only one transformer feeding all of the zone valves in the system you can omit the wires to the IAR negative terminals IAR on all but one of the zone valves This is because these terminals are jumpered internally on the electrical connection board If there is more than one transformer provide one wire from each transformer common side to one of the IAR negative terminals IAR Sensor wiring Header sensor is required A header sensor must be installed in the system supply piping Connect the header sensor ONLY to the master boiler Install the header sensor in an immersion well Locate the sensor where it will accurately sense the system water supply temperature Connect the sensor leads to the electri cal connection board as shown in Figure 8 page 10 Outdoor reset application To operate with outdoor reset purchase and in stall an outdoor sensor Mount the sensor such t
15. times that some boilers are not firing It limits input of the boilers to keep them as efficient as possible Once all boilers are started during high heat demand periods this limit is remove and all boilers can fire up to maximum input Once any boiler is dropped offline the limit is applied again This setting helps reduce short cycling when water temperature is within the heat band If the water temperature rises to the top of the heat band less the STOP BAND OFFSET before a boiler just added has completed its modulation delay time the boiler will shut down Example if the top of the heat band is 190 F and stop band offset is 15 F a newly added boiler will shut down if the temperature reaches 175 F 190 15 before its modulation delay time has ended DO NOT CHANGE This is the time from receiving a call for heat to when a boiler begins its modulation operation running at minimum fire This parameter should generally be left at factory default This parameter should generally be left at factory default This parameter should generally be left at factory default This parameter should generally be left at factory default Select the rotation method True rotation attempts to fire all boilers an equal amount of time First on first off jogs between boilers to balance usage Last on first off maintains the same rotation sequence at all times Set this to ON to always start the master boiler first regardless of the
16. 0 to 60 minutes MOD MAX LAST SS 50 25 to 100 STOP BAND OFSET Po 5 F 0 to 50 F BLR START TIME 7 50 seconds 0 to 4 minutes P ROPOR FE 100 0 to 100 DNTEGRAL 10 0t0100 D ERIVAT 10 0t0100 BAND 10 F 40t0180F FIRING MODE ROTATION TRUE True FOFO LOFO MASTER 1ST O F SENSOR C OUTSIDE TYPE TVPEZ TYPEZ None ON OFF CALIBRATE NO YESorNO ACCEPT gt E YES YES or NO BAUD o w PARITY FD EVEN EVEN FACTORY CAL ee pT AREYOU SURE gt No FACTORY SET ee CONTROL pT pT AREYOU SURE gt MODULATION PID SENSORS PASSWORD COMMUNICATIONS LOAD DEFAULTS SYSTEM UPDATE CTRL ARE YOU SURE gt NO ADVANCED SETUP P N 42 9452 8 08 Copyright Hydrotherm KN USER S CONTROL MANUAL 4 Control menus and adjustments continued Table 8 Setup menus parameter explanations Explanation HEAT BAND BOILERS Boilers stage OFF when The heat band is the height of the modulating sie et as band When the water temperature is between 1 2 the heat band above or below the setpoint temperature boiler firing rate modulates Boilers are at minimum input at the upper end of the band and maximum input at the lower end of the band Boilers come on only if the water temperature is below the band Boilers stage off when the water Boilers stage ON when water temp isbelow temperature is above the band heat band J LOC SETPT SETPOINTS Setpoint temperature controlled by the KN contr
17. 45 cable Modbus INPUT from building management system USB cable port for USB cable connection to a PC required when updating control firmware RJ45 cable from building management system when used Plug for insertion into KN control electrical connec tion panel see page 3 NOT SHOWN An optional plug in bridge is re quired to interface with building management systems that use BACnet or LonWorks protocol The KN control supports Modbus protocol with no additional components except the RS485 interface board KN USER S CONTROL MANUAL 2 Overview 1 This method uses an RS485 digital communications cable with the Modbus protocol to control a boiler or HeatNet net work 2 The boiler or boiler network will operate as in the HeatNet lo cal control method Section 1 of this manual But instead of the HEAT DEMAND input a software form of the HEAT DEMAND input is used address 40001 Boiler System Enable Disable 3 The System Setpoint Timer needs to be loaded periodically to allow the HeatNet system to revert to local control from the master boiler in the event communications is lost 4 The Modbus protocol allows writing and reading registers using Modbus commands An optional BACnet or LonWorks bridge module can be used to connect the Modbus net work to a BACnet or LonWorks network 5 This method allows enabling and disabling the boiler or HeatNet system changing setpoints and reading boiler status
18. BOILER CYC LOG RUNTIME Displays the number of times the boiler gas valve has been cycled on then off It does not include failed ignition attempts COMB AIR DMPR AUX FNCTIONS Select YES to connect a combustion air damper and its end switch to the electrical connection IN USE board USE RELAY Only one relay is available PROOF TIME Set proof time long enough to be sure the combustion air damper can open and activate its end switch DHW PROTECTION AUX FUNCTIONS Select YES to have the control alarm and disable the DHW demand input if a DHW demand lasts for more than 60 minutes SYSTEM CLOCK Set the system clock time day of week month day and year on start up and after any power outage to ensure the data log time stamp information will be accurate LOCAL ADD ADVANCED SETUP Assign each member boiler a unique address beginning with 2 or higher Enter any value from DISTRIB CTRL 2 to 16 NOTE When the master boiler control displays the number of boilers on the network it will show numbers above 9 as letters 10 A 11 B 12 C 13 D 14 E and 15 F For example if there are 12 boilers on the network then the master control will show HeatNet BOILERS 123456789ABC when displayed in the BOILERS menu The master boiler local address is automatically set to 255 The master boiler is automatically recognized because it is the one with a header sensor wired to its HEADER SENSOR terminals CONSOLE ADD
19. F so the OP LIMIT setting can be 195 10 205 F maximum allowable setting The operating limit setting OP LIMIT always limits boiler outlet water temperature regardless of how the boiler is controlled HeatNet member 4 20ma control or stand alone The limit band see below determines when the boiler begins to be forced to reduce input as the outlet temperature rises toward the limit setting LIMIT BAND SETPOINTS Boiler firing rate is limited Boiler OFF above If the boiler outlet water temperature rises toward oa ee the limit setting OP LIMIT above the KN control i eee will begin to reduce the boiler s firing rate when the temperature gets within the LIMIT BAND e degrees F below the operating limit setting At limit band the lower end of the limit band the boiler can fire Wa AR let lol up to maximum input 100 By the time the oo pol rn a eae temperature reaches the upper end of the band wo water temperature is the OP LIMIT setting the boiler is limited to lt wA below the limit band minimum input 20 The limit band reduces the likelihood of short cycling on boilers controlled by a master control or a remote control by reducing boiler maximum allowable firing rate as the temperature rises toward the limit setting Make sure the lower end of the limit band is above the upper end of the heat band Control limits boiler P N 42 9452 8 08 Copyright Hydrotherm KN USER S CONTROL MANUAL 4 Con
20. HeatNet control KN HeatNet Control panel Control overview The KN HeatNet control monitors boiler temperature and limit circuit inputs modulating boiler firing rate to meet demand The control uses microprocessor electronics watching time average response from the system to anticipate how much heat the system needs Coupled with the five to one turndown of the KN boiler this results in maximum possible condensing mode operation The KN boiler will provide unmatched seasonal efficiency Indoor air reset IAR HydroThermss unique approach to boiler output regulation is its Indoor Air Reset function The control monitors the demand from up to 8 different zones Watching the demand duration and response to supply temperature averaging over time the HeatNet control anticipates system needs It sets boiler maximum firing rate and adjusts supply water temperature to fine tune boiler heat output All that is required to enable IAR is to connect thermostat circuit wires to the IAR inputs The HeatNet control can also be configured for outdoor reset operation but IAR provides response based on system behavior rather than just looking at outdoor temperature The HeatNet platform HeatNet controls are designed to provide an integrated boiler management system on every boiler The platform provides multiple levels of selectivity HeatNet electronics can be operated as a simple single boiler control while still providing intelligent regul
21. IONS Only as required LOAD DEFAULTS Only as required SYSTEM Only as required Notes 1 HD Only means to set the parameter for a member boiler only ifit is wired for Heat Demand override 2 DHW Only means to set the parameter for a member boiler only ifit is wired for DHW Demand override 3 HDOA Only means to set these parameters only ifthe member boiler will be operated with outdoor reset when put in override mode with closure across its Heat Demand terminals requires outdoor sensor connected to boiler KN USER S CONTROL MANUAL 4 The Heat Net control display Starting the display l Verify that the HEAT DEMAND and DHW DEMAND wires are removed nan A WwW N Check all wiring to make sure it is complete and all wires are securely connected Close the external gas valve on every boiler Turn on power to the boiler and then turn the boiler on off switch ON The control will beep at least twice and the display will show the first STANDBY display in Figure 18 Note that pushing the DOWN button on the keypad will change the right side of the display as shown providing information on various setpoints and parameters The display LOC SET means the setpoint temperature Figure 18 shows the fac tory default values Accessing setup menus l pA With the display in STANDBY press and hold the BACK key for 5 seconds The display will change to gt SETUP IEW LOL Press the SELECT
22. KN 2 4 CM2 808 Hydro Therm Models KN 2 and KN 4 Control manual Control adjustmentanad Operation Instructions Alsoread and follow KN Boiler manual KN Vent air manual CERTIFIED ENERGY STAR WARNING 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 WARNING 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 CAUTION Affix these instructions near to the boiler water heater 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 P N 42 9452 8 08 Copyright Hydrotherm KN USER S CONTROL MANUAL The KN boiler
23. LAST MEMBER boiler All of the other member boilers should have their termination dip switches OFF There may be two or more MASTER boilers Ensure that only one header sensor is present and con nected to the HEADER input There should be no wires or sensors connected to the HEADER input if the boiler is operating as a member Verify that the HNet cables are of a shielded or twisted pair type Shielding of the cable is required Minimize possible electrical interference by routing the communications cables away from electrical noise sources such as motors ignition controls contactors etc Only the MASTER boiler Fires but In order for the MASTER boiler to act as a MASTER the header sensor must be set to TYPEZ and there the system has many boilers and must be a header sensor present is using HeatNet Q At power up the header sensor is auto detected If the temperature of the header sensor at power up is greater than 25 F and less than 240 F it is considered a valid sensor The boiler will default to the MEMBER mode if the temperature is not in this range and can only be run locally or by external inputs Q The HNet needs a communications cable daisy chained between boilers Ensure that a good connection is made on the communications board and that the lights on the dual RJ45 jacks flash roughly twice a second The MASTER is the only one that should flash with no communications cables plugged in You get the error message L
24. Make sure there is no call for heat at the boiler before attempting to perform setup adjustments To return to STANDBY press release until the display returns to standby or turn boiler ON OFF switch off then on Level 1 Level 2 Level 3 Level 4 Default Range Typical line OO next OO next item OO next item OO next item OO to change value Display shows two item i i S to select S to select pec to select to accept value and return to lines at a time cursor S to select z previous menu level indicates active line j back one level back one level back one level BOILERS BOILERS C to 16 display only a rs 1 display only the lead boiler is the boiler with a HEADER sensor connected wao O O o a e Display only shows 1 through the number of 123456789ABCDEFG boilers on the network C A a E AVG TIME i 60 MIN 30 to 120 minutes SET IAR SETPTS DELTA TEMP 10 F 10 to 20 F DELTA TEMP 20 F 10 to 20 F LO IAR 40 40 to 70 VIEW IAR VALUES Display only not changeable here shows values OUTDOOR AIR OA SHUTDOWN rs a OFF ON or OFF OA RESET POF ON or OF F SET OA SETPTS ill o o 140 F 60 to 150 F HIOA 70 F 50 to 90 F LOWOA 10 F 35 to 40 F PUMP OPTIONS DETAENAB fF ON or OFFS we o o Pawson PY er Pwsrenune P _ OF n er ENTRY IS OFF SETBACK Ts 20 F 0 to 50 F stDAY SUN SUN MON TUE WED THU FRI SAT ENDDAY sf SUN SUN MON TUE WED TH
25. Method 3 External 4 20ma control page 16 Up to S boilers can be controlled by an external control that provides a 4 20ma input signal The external controls must also activate each boiler by closing a contact across the boiler s 4 20ma Remote Enable contacts Member boilers can override external boiler control if they receive a contact closure on the Heat Demand or DHW Demand terminals 4 Control menus and adjustments page 22 KN HeatNet Control panel Operating parameters and control behaviors are set using the KN control display keypad interface Refer to this section for the menu structure and explanations of the setting options 5 Troubleshooting seeseeeeeees page 31 P N 42 9452 8 08 Copyright Hydrotherm KN USER S CONTROL MANUAL l Method 1 HeatNet modulation local control Figure 1 Electrical connection board see item 10 WARNING Electrical shock hazard Disconnect all electrical power page 3 for location Also see the wiring sources to the boiler before making any electrical connections summary illustrations on the next pages Label all wires prior to disconnection when servicing controls Wiring errors can cause improper and dangerous operation Verify proper operation after servicing Factory wiring harness plugs Failure to comply with the above could result in severe personal injury death or substantial property damage Notice The electrical connections to t
26. NG THE FIRMWARE UPDATE PROGRAM Start the Firmware Update Program It will auto detect the KN 2 control The program dialog box will automatically show the control s comport number in the first box The second box will show the firmware file number Make sure this is the correct file If not use the box to the right of the file name to navigate to the correct file Navigate to the control Advanced menu System Select YES to update the control NOTICE The firmware must be downloaded now for the KN 2 control to function again Return to the computer Select UPDATE The computer program will ask to turn the boiler off then back on After the power is cycled on the boiler the download will start If the download is interrupted or fails turn the boiler ON OFF switch OFF then ON Restart the firmware download program to start the download The boiler will appear unresponsive during this time because it is wating for the download to take place When the download is complete the boiler will power cycle The display should show STANDBY If the firmware does not load correctly the display will remain blank Try running the firmware program again Check that the boiler performs properly P N 42 9452 8 08 Copyright Hydrotherm S Table9 Accessing and using the Log KN USER S CONTROL MANUAL Troubleshooting Enter Setup From STANDBY hold scx for 5 seconds Then press Q until th
27. U FRI SAT Deve On ner ws OC P N 42 9452 8 08 Copyright Hydrotherm KN USER S CONTROL MANUAL see Table 8 page 25 for explanations continued RUN HRS a Total time gas valve has been open Control menus and adjustments continued LOG ENTRY Pf Current entry in the log see Table 9 page 30 BOILER CYC ee Number of times gas valve has been cycled on off COMB AIR DAMPER YES YES or NO IN USE USE RELAY es y y o PROOF TIME O O Amin 0 sec 0 to 4 minutes DHW PROTECTION NO YES or NO IN USE DISTRIB CTRL MODULAR BOILER 4 Table 7 Setup menus LOG RUNTIME AUX FUNCTIONS SYSTEM CLOCK ee a en OO On 5 gZ n Nn w E a S a en o a uo a Ow oO 5 So ww S Z9 Z A ORS Nn c o a 2 v 2 Vey a o U UU A EEN 5 S S z S z S Il t VY _ U w one l iene l l ites SS 5 F S ololololo lo 23 S ro ra 2Z 2 2 2 2 2 o D a D gt o D ie oj Oo CO Of CO cs gt l 5 MINILNININITN g 42 W au a ee ee aa o 2 gt gt gt I z Nn Nn D D Dl pe Sm a A S S NO CHANGE PASSWORD NEW gt CHANGE PASSWORD OLD gt HNET MASTER Lae YES Display only not changeable here CONSOLE ADD FY Default 1 Range 1 to 247 ADD BOILER DLY fp 10 minutes 0 to 15 minutes SHED BOILER DLY OO 2 minutes 0 to 15 minutes MOD DELAY TIME po 10 seconds
28. aster other manner It cannot be If the circulator motor is larger than 1 4 hp boiler used for system circulation connect the circulator using a motor contactor 20232 P N 42 9452 8 08 Copyright Hydrotherm KN USER S CONTROL MANUAL l Method 1 HeatNet modulation local control on External interlocks Figure 9 1 Wire external limits and flow switch when used as shown in Figure 8 page 10 Termination DIP switches see item 7 Figure 7 page 9 for location 2 If wiring to and from a motorized combustion air damper follow the guidelines DIP switches located at given in Figure 8 page 10 Connect only to the master boiler switches located a left of RS485 communications re board on electrical connection CAUTION If any of the member boilers is to operate in override mode and the board system is equipped with a combustion air damper you must provide special wiring in order to ensure the damper opens and proves when the boiler fires This must be done without compromising the wiring between the master boiler and the damper mr Overrides Control priorities 3 The KN control can provide override operation for any or all member boilers in a HeatNet network This requires the boilers be piped with appropriate isolation piping and controls z v p a E No OLE a 4 Override is done by closing a contact across the Heat Demand or DHW Demand termina
29. ation of boiler firing rate to match system demand With a few key strokes on the key pad the HeatNet control can operate as a sophisticated multiple boiler controller using simple RJ45 cable interfacing between units The control can even accept external control commands from building managements systems Modbus standard with optional bridge for BACnet or LonWorks or 20 milliamp analog input from an external controller The control method used by the HeatNet control is based on digital communications which eliminates the need for analog control signals Analog signal inputs are supported but a higher level of control precision repeatability and feedback is gained with digital communications The HeatNet control can be versatile providing for operation in multiple ways Operation as a stand alone boiler Operation as a boiler in a boiler network using the on board HeatNet protocol Operation as a member boiler in a boiler management system Operation as a member ofa remotely controlled boiler network 20 milliamp regulation Setpoint can be determined by the HeatNet control or by a 20 milliamp input signal PID response The HeatNet control uses proportional integral derivative calculations to determine the response to boiler water temperature changes This means it not only looks at how far away the water temperature is from the setpoint temperature but how fast the temperature is changing and how it has responded over time This ens
30. ay will show P if boiler pump was on M if main valve was open D if combustion air damper was energized NOTICE The second line will show typical reading as shown unless an error code is displayed See codes at right B if blower was on and l if ignition cycle was in process _ B indicates bypass pump was on 100 or other value shows the IAR MAX INPUT value if there was a heat demand at the time Screen 3 Messages NO FLOW SENSED OPERATE HIGH LIMIT high limit tripped SETPT LIMIT OP LIMIT reached SETBACK __IS ACT setback initiated shows 1 to 4 SETBACK __ EXPIRED setback completed shows 1 to 4 COMBUST AIR FAIL SYST RESET OURWP internal control processor error detection OUTDOOR RESET OPEN with SUPPLY HEADER OA or RETURN sensor is open SHORT with SUPPLY HEADER OA or RETURN sensor is shorted FOUND BOILER master boiler detecting member boiler LOST BOILER master boiler losing signal from member boiler IGN LOCKOUT USER INTERLOCK BLOCKED FLUE e BLOCKED INLET IAR COMM FAILURE indicates problem with wiring between control and connection board IGN LOCKOUT RETRY BLOWER PROVE FAULT blower did not prove during pre purge time P N 42 9452 8 08 Copyright Hydrotherm S KN USER S CONTROL MANUAL Troubleshooting continued Suggested procedure Nothing happens when the power switch is turned on
31. d out and the heating boilers will not fire 2 Ifthe water temperature is within the heating band around the setpoint boilers will not come on 3 The water temperature must fall below the lower band limit to begin firing boilers L In H Net method the KN control auto detects the boilers in the system and adjusts the number of boilers accordingly Using H NET if the numbere of boilers is not being detected properly as the actual number of boilers in the system check each boiler There can only be 1 master boiler but there can be up to 15 member boilers Make sure only the master boiler has a Header Sensor connected Verify that each boilers HeatNet cable is in place Verify that each boiler has a unique address assigned ADVANCED SETUP DISTRIB CTRL LOCAL AD Verify that the latest version of firmware is installed on all boilers All boilers in a system must have the same firmware revision version Verify the proper termination is set on the Master and the last Member boiler KN USER S CONTROL MANUAL 5 Troubleshooting continued Suggested procedure HeatNet boilers are detected but Q The H Net communications cable may be receiving interference from the blower ignition or other form then lost and then detected again of radiated electrical noise LJ Termination of the jumpers may not be correct or there is more than one master 1 Ensure that the termination dip switchs are set on the MASTER boiler and only the
32. e KN Boiler manual to start up each boiler and verity operation 1 HD Only means to set the parameter for a member boiler only if it is wired for Heat Demand override Master boiler cable 2 DHW Only means to set the parameter for a member boiler only ifit is wired 1 Connect an RJ45 cable to the master boiler H Link OUT block item 2 Figure 10 foe DEW D ovemice page 13 or 3 wire shielded cable to the H Link terminal strip item 4 Figure 10 3 HDOA Only means to set these parameters only if the member boiler will be Th h dofthi bewi hed hef Laole operated with outdoor reset when put in override mode with closure across its Heat page 13 e other end or this cable will be attached to the first member boiler in Demand terminals requires outdoor sensor connected to boiler following steps P N 42 9452 8 08 Copyright Hydrotherm We ge ee i KN USER S CONTROL MANUAL l Method 1 HeatNet modulation local control on Turn on power to the master boiler and set its on off switch to ON You should hear at least 2 beeps The control s firmware version number will display my After the control s timer finishes the display will STANDBY Ate Sy show STANDBY and SYS SET This verifies that the master boiler is setup correctly as the master The same display will show on member boilers when there is a call for heat from the master boiler When there is no call for heat ata member boiler the display will show LOC SET
33. e cursor points to VIEW LOG Press Ss with the cursor on VIEW LOG The screen will now show the most recent entry in the log Use the arrow keys to scroll through the log entries entry number and date are on the first line of the log screen Each log entry includes three screens as described below The top line remains the same in all three and contains the date stamp and entry number An entry is made each time a change in demand occurs or when demand changes from heating to DHW or back each prepurge and postpurge occurrence and each ignition sequence An entry is also made when any of the Screen 3 events below occurs These events may be errors faults or notification of setback activity Screen 1 Date stamp Time of day Date Entry number from 1 to 1000 highest number is most recent entry Setpoint temperature m 19 E p ra Water temperature at time of entry Shows the modulation percentage from 20 to 100 Mod readings can often be an indicator of boiler status Examples 45 may indicate prepurge while 30 may indicate the boiler was in ignition sequence Outside air temperature if sensor iaar F eee miin connected otherwise display NA Displays HD for heat demand DH for DHW demand NC is there is no call for heat or LK if boiler is called to heat by the master boiler Displ
34. e terminals only during boiler setup as given in the Boiler manual L 4 A t DHW tank aquastat when used A DHW circulator and circulator relay will be required Start the DHW circulator on call for heat from the tank aquastat Master boiler Room thermostats end switches or relay contacts Connect thermostat zone valve end switches or remote start relay contact here Test when done to ensure no stray voltage is present on any of the wires See the Boiler manual for procedure Member boiler Connect override contacts only Individual boilers if piped appropriately can be activated for override operation such as DHW heating or emergency space heating 4 20mA input option for remote setpoint control ONLY Connect remote temperature control 4 20mA input wires here when remote setpoint is required Setpoint 30230 temperature will equal milliamps 0 09 example 11 mA would cause a setpoint of 11 0 90 122 F P N 42 9452 8 08 Copyright Hydrotherm O 9 d KN USER S CONTROL MANUAL Method 1 HeatNet modulation local control on Figure 8 KN wiring summary wiring to electrical connection board continued see Figure 7 page 9 for terminal strip locations 4 Also see Figure 5 page 7 External high limits low water cut offs or other limits if used J 24VAC INTERLOCKS q yr pee oro CIRC ALARM OPT HIGH FLOW USER LIMIT SWITCH INTRLK Power for combustion ai
35. e termination DIP switch settings Use the settings for Modbus communications given in Table 1 page 11 Connect communications cables RJ45 or shield wire cables between the control communications boards as for the local control method Verify network operation BEFORE connecting the building management system Connect the BMS cable l DO NOT connect the building management system cable until the boiler network has been proven to operate inde pendently The system is designed to revert to local control by the master boiler should communications with the building management system be lost Turn off power to the master boiler See Figure 10 page 13 Connect an RJ45 cable to the BMS input port item 6 Or use shielded wire cable connected to terminal block item 3 Verify BMS HeatNet operation l Turn on power to the master boiler 2 Allow the master boiler to initialize 3 Verify operation with the building management system P N 42 9452 8 08 Copyright Hydrotherm Al Address 30001 30002 30003 30004 30005 30006 30007 30008 30009 30010 30011 30012 30013 30014 30015 30016 30047 30048 30079 Data Type Table 5 Modbus input read only registers Description ion BTU Load 0 100 Boilers Running U S Method 2 HeatNet modulation BMS control on Valid Values Range Header System Temperature 32 250 Supply Temperature 32 250 Modulation S S U
36. ed on page 18 PURGE TIME 5 System clock Set the system clock on all boilers to ensure the time stamps will ALWAYS ON 6 Turn on the power to each boiler and set the on off switch to ON as you set its HUES Salt oe i sete DOMED SE parameters NIGHT SETBACK Set on master boiler only 7 Use the boiler s keypad to enter the parameters as described on page 22 OPTIONS all Set 8 After setting a boilers parameters turn the power off to the boiler until you are AUX FUNCTIONS Set on master boiler only ready to start the boiler up following the Boiler manual instructions delines given in _SYSTEMCLOCK 9 Set the master boiler and each member boiler following the guidelines given in Table 2 LOCAL ADD Set beginning at 2 CONSOLE ADD Set beginning at 2 Start up boilers per KN Boiler manual eased ite Se MODULATION PID Set on master boiler only 1 Turn off power to all boilers Set on master boiler only TYPE HD HDOA only Connect network cables CALIBRATE On any boiler if required Electrical shock hazard Turn off power to each boiler before COMMUNICATIONS attempting to connect the network cables LOAD DEFAULTS On any boiler if required NOTICE Before turning boilers on to check network operation disconnect all a SYSTEM On any boiler if required call for heat wiring at the electrical connection boards This will prevent the boiler for attempting to cycle during the setup process Notes 2 Follow all instructions in th
37. hat it is shielded from direct sun light if possible and not likely to be covered by snow drifts or debris Connect the outdoor sensor leads to the master boiler s electrical connection board as shown in Figure 8 page 10 Member boilers could have their own outdoor sensor if they will be operated in override mode by closing the Heat Demand terminals Return water temperature sensor The return water temperature sensor is optional only needed if you want to automatically control the boiler postpurge pump cycle time Install the sensor in a well in the boiler return piping Connect the sensor leads to the electrical connection board as shown in Figure 8 page 10 DHW wiring To operate the boiler for domestic water heating with a storage tank install and pipe the tank according to the tank manufacturer s instructions and the recommended piping diagrams in this manual Consult the factory for applications not covered The circulator used for DHW must be operated by a circulator relay or zone con troller that is activated when the tank aquastat calls for heat Connect the tank aquastat terminals across the DHW DEMAND terminals on the master boiler s electrical connection board as shown in Figure 7 page 9 Member boilers could be connected to tank aquastats if they are piped appropriately and intended to operate in override ee Figure 6 Indoor Air Reset wiring to IAR terminals with 4 wire zone valves and no zone controller see F
38. he instructions in the KN Boiler manual see notes Failure to comply could cause a boiler failure leading to possible HEAT BAND Set on master boiler only severe personal injury death or substantial property damage LOC SETPOI NT Set HD only SOURCE Set HD or DHW only S S be used S S et et Set control parameters on keypads OP LIMIT et et 1 1 2 2 To Toa Before turning boilers on to set parameters disconnect all call for heat LIMIT BAND oo Se Set wiring at the electrical connection boards This will prevent the boiler IA RESET ON if IAR is used Don a for attempting to cycle during the setup process oF set io OFF 1 See Control menus and adjustments beginning on page 22 for a complete list of OA SHUTDOWN Set ON if used HDOA only control parameters and explanations OC aTOI EE 2 Carefully read the parameter explanations in Table 8 page 25 through page 29 OA SETPOINT HDOA only 3 When adjusting the limit band operating limit OP LIMIT local setpoint LOC SETPOINT and DHW setpoint make sure the operating temperature bands do OA RESET HDOA only not overlap or cause potential for nuisance cycling OA SETPTS HDOA only 4 Indoor air reset Use this option whenever possible The indoor air technology DELTA ENABLE monitors space heating demand to help the boiler operate at the highest possible efficiency throughout the season To operate with IAR you must wire to the IAR DELTA TEMP input terminals as describ
39. his boiler must be made in I i accordance with all applicable local codes and the latest revision of the National Electrical Code ANSI NFEPA 70 Installation should also conform to CSA C22 1 Canadian Electrical Code Part I if installed in Canada Install a separate 120 volt 15 amp circuit for the boiler A properly rated shut off switch should be located at the boiler The boiler must be grounded in accordance with the authority having jurisdiction or if none the latest revision of the National Electrical Code oe DIP SW oon 1234 seed 2 pecooHfed 3 oofed had bed ANSI NFPA 70 Line voltage field wiring of any controls or other devices must a use copper conductors with a minimum size of 14 awg Use Figure2 120VAC power service terminals on electrical appropriate wiring materials for units installed outdoors connection board See Figure 15 for location of the power terminal strip Overview control setup sequence caution Follow the Boiler manual Install the boilers according to the KN Boiler manual before attempting to set up the control system POWER SERVICE Install all boilers per the Boiler manual Close the external gas valve on every boiler 120VAC Wire all boilers following the guidelines in this section Attach a header sensor to the master boiler ONLY The KN 2 control automati cally configures the boiler with a header sensor as the master PAUND Set the master boiler control parameters
40. igure 7 page 9 for terminal block 6 location ON t 1 en oe ee IAR1 IAR2 IAR3 IAR4 IAR5 IAR6 IAR7Z IAR8 To other zone valves up to 8 zones total WARNING Rewire the zone 24VAC to other valves if necessary to zone valves ensure the hot leads are connected as shown e gt 4 wire zone valves typical Ene eee EE Cee EC ge ROS ae eee es ee eee CEEE Q 24VAC gt Transformer 120VAC N Connect all end switch wires to the Heat Demand terminals on the electrical connection board 20205 H P N 42 9452 8 08 Copyright Hydrotherm KN USER S CONTROL MANUAL Method 1 HeatNet modulation local control on Figure 7 KN wiring summary wiring to electrical connection board D Also see Figure 2 page 6 POWER SERVICE ions Factory wiring harness plugs 3 z oOo DIP SW pS dhl 5 scot 2 becco il od 3 hee ee 4 jes ry e Electrical connection board Located in center panel on boiler right side 15 amp fused service switch by installer 120VAC 60HZ 1Ph Power to boiler 2 The boiler is shipped with E E a jumper across the HEAT DEMAND terminals Remove this jumper when using a thermostat or other external 4 20mMA REMOTE HEAT DHW KO HIGH 4 control to start the boiler ENABLE DEMAND DEMAND _ FIRE FIRE LU Use thes
41. iring terminal strip see Figure 11 page 16 for location Also see the wiring sum mary illustrations on the next pages BY Hy tl ll ALARM Hy PASS CIRC OPT 120V II fz i gt N da Ie J ion ae Dry contact out to remote alarm oO Alarm contact closes on open or set shorted sensor ignition lockout 2 flow switch or user interlock i combustion air damper failure j x ii blocked flue or blocked air inlet pci All boilers can be connected to F z alarm by wiring in parallel ote g e UT 6 F i DO NOT directly connect W y i lt circulator if motor is over 1 4 HP p j Use a motor contact or relay E z 120VAC Power to L circulator H Fused service switch by installer e n Gnd a 6 f 120 VAC i Postpurge circulator KN 2 only Boiler circulator or boiler system circulator KN USER S CONTROL MANUAL Method 3 External 4 20ma control continued 4 20mA operation l A 4 02 mA current signal will start the boiler at low fire A 20mA signal will cause the boiler to go to full input Between these input signal limits the boiler modulates The boiler firing rate percentage is equal to the percentage of the signal between 0 and 20 mA Example a signal of 12 mA is 60 of 20 mA so the boiler firing rate would be 60 of max In addition to the 4 20mA signal the remote controller must also close a con
42. key to select setup Note that pressing the DOWN key would change the selection to VIEW LOG The display will now show the first options in the setup menus gt RENO YW aaa BOILERS Press the DOWN key to access additional menu options Pressing the DOWN button once will change the display to ENO MAA gt BOILERS The cursor moves to the second line indicating this option could now be selected with the SELECT key Continuing to press the DOWN key will access these menu options e BOILERS e SETPOINTS e INDOOR AIR e PUMP OPTIONS e NIGHT SETBACK e OPTIONS e LOG RUNTIME e AUX FUNCTIONS e SYSTEM CLOCK e ADVANCED SETUP Figure 18 Control menus and adjustments Heat Net display during Standby no call for heat pressing the DOWN key on the keypad changes the display as shown LOL JE 158 F UAW JET 18A F HEHUER 138 F SUPPLY TA F Pai 3 TANOB Y STANLEY STANLEY STANLEY STANLEY RETURN TA F HOO OLY mlali SMU LLY 12H IHR MHA Fi ST TEMP 138 F SHU OLY STANLEY STANLEY STANLEY O O O O O O O O 5 1AHDB Y 5 1AHDE Y O STANDBY 145 F P N 42 9452 8 08 Copyright Hydrotherm KN USER S CONTROL MANUAL 4 Control menus and adjustments continued Table 7 Setup menus see Table 8 page 25 for explanations To enter Setup From STANDBY hold ox for 5 seconds Then press S with cursor on SETUP
43. ls of any boiler These priority inputs override all network controls or 4 20mA input controls to the boiler 5 DHW Demand The DHW Demand closure takes priority for ALL boilers in cluding the master and all members When DHW Demand closes the boiler or boilers immediately switch to DHW operation including setting the water tem perature to the DHW Setpoint 6 Space heating Heat Demand If any member boiler sees closure across its Heat Demand terminals it will begin operation in space heating mode indepen Table 1 dently of commands from the master boiler or 4 20mA input source CAUTION Do not wire boilers for override operation unless the piping design Boiler Modbus provides automatic isolation of the overriding boilers The master see note Termination DIP switch settings boiler would be unable to properly control system water temperature if member boilers were to input heat to the system without control from the master DHW operation in particular would raise the supply temperature from overriding boilers to the DHW Setpoint NOTICE Override operation control setup Boilers must be set up with operating parameters necessary during their override operation i e local setpoint DHW setpoint etc Summary priority sequence is Priority 1 DHW Demand Priority 2 Heat Demand Switch 1 Switch 2 Switch 3 Switch 4 Switch 1 Switch 2 Switch 3 Switch 4 Switch 1 Switch 2 Switch 3 Switch
44. m Overrides Control priorities l S The KN control can provide override operation for any or all member boilers This requires the boilers be piped with appropriate isolation piping and controls Override is done by closing a contact across the Heat De mand or DHW Demand terminals of any boiler These priority inputs override all 4 20mA input controls to the boiler DHW Demand The DHW Demand closure takes prior ity for ALL boilers including the master and all members When DHW Demand closes the boiler or boilers immedi ately switch to DHW operation including setting the water temperature to the DHW Setpoint Space heating Heat Demand If any member boiler sees closure across its Heat Demand terminals it will begin operation in space heating mode independently of com mands from the 4 20mA input source CAUTION Donotwire boilers for override operation unless the piping design provides automatic isolation of the overriding boilers Override operation control setup Boilers must be set up with operating parameters necessary during their override operation i e local setpoint DHW setpoint etc Summary priority sequence is Priority 1 DHW Demand Priority 2 Heat Demand Priority 3 4 20mA Input Enable P N 42 9452 8 08 Copyright Hydrotherm KN USER S CONTROL MANUAL Method 3 External 4 20ma control continued Figure 16 KN wiring summary wiring to electrical connection board
45. ng to Heat Demand or DHW Demand terminals to ensure there will be no call for heat while proceeding Set the boilers control parameters using their display keypads Follow the instructions in the Boiler manual to start up each boiler before proceed ing further Finish by reconnecting call for heat wiring then operating the complete system to verify operation in all modes Connect 4 20mA wiring l See Figure 16 page 19 for wiring from the 4 20mA controller The control must provide the 4 20mA signal and a contact for each boiler to enable its operation by closing across the Remote Enable contact Power supply 120 VAC See Figure 11 and Figure 12 Connect minimum l4awg copper wire to the power connection as shown in Fig ure 12 Install a fused service switch mounted and installed in accordance with all appli cable codes Method 3 External 4 20ma control Electrical connection board see item 10 page 3 for location Also see the wiring summary illustrations on the next pages Figure 11 Figure 12 120VAC power service terminals on electrical connection board See Figure 15 for loca tion of the power terminal strip POWER SERVICE 15 amp fused service switch by installer Gnd NO H 120VAC 60HZ 1Ph Power to boiler P N 42 9452 8 08 Copyright Hydrotherm KN USER S CONTROL MANUAL Method 3 External 4 20ma control continued Circulator wiring Postpurge circulator
46. ntactor Boiler circulator or boiler system circulator This circulator must be supplied piped and wired by the boiler installer See the suggested piping diagrams in the Boiler manual for circulator application and piping IMPORTANT If the circulator motor is larger than 1 4 hp connect the circulator using a motor contactor Outdoor Return sensor water if used sensor Override S if used mode upply ONLY sensor factory installed to boiler outlet 20239 P N 42 9452 8 08 Copyright Hydrotherm KN USER S CONTROL MANUAL 3 Method 3 External 4 20ma control continued Close the external manual gas valve on every boiler before proceeding DO NOT open any gas valve or attempt to fire any boiler until the boilers have been set up and verified following the instructions in the KN Boiler manual Failure to comply could cause a boiler failure leading to possible severe personal injury death or substantial property damage Set control parameters on keypads NOTICE Before turning boilers on to set parameters disconnect all call for heat wiring at the electrical connection boards including the wiring to the boilers Remote Enable terminals This will prevent the boiler for attempting to cycle during the setup process See Control menus and adjustments beginning on page 22 for a complete list of control parameters and explanations Carefully read the parameter explanations in Table 8 page 25 thr
47. ocation or the piping Boiler circulator See the Boiler manual for circulator piping Figure 3 Figure 4 and Figure 5 show wiring of the Boiler circulator or boiler system circulator to the terminal strip of the KN 2 electrical connection board DO NOT directly connect a circulator with a motor larger than 1 4 hp For larger motors install a circulator relay or motor contactor Figure 3 and Figure 4 show the correct ways to install the boiler circulator using a relay or motor starter Figure 3 Wiring the boiler circulator using a circula tor relay required for motors over 1 4 hp Dery 120VAC 60HZ 1Ph if Ki Circulator relay with internal 24VAC transformer Boiler circulator or boiler system circulator 120 VAC 20209 Figure 4 Wiring the boiler circulator using a relay or starter required for motors over 1 4 hp jr 120VAC 60HZ 1Ph Relay or motor starter with 120VAC coil Boiler circulator or boiler system circulator 120 VAC 20210 P N 42 9452 8 08 Copyright Hydrotherm Figure 5 Circulator wiring terminal strip see Figure 1 page 6 for location Also see the wiring summary illustrations on the next pages Hy fl yl i ALARM OPT BYPASS CIRC A 120V Con To combustion air damper motor power supply and motor master boiler ONLY see wiring summary illustrations for more information 120 VAC F Dry contact out to remote ala
48. ol NOTE If the control is operated by a Master control or by a remote control building management system 4 20ma control etc this setpoint temperature only comes into play when the KN 2 control is in override mode such as by closing its Heat Demand or DHW Demand terminals SOURCE SETPOINTS Specifies where the space heating setpoint temperature comes from AUTO means the KN control determines the setpoint using local setpoint outdoor reset or header temperature setpoint The option is 4 20ma If 4 20 ma is selected the KN control determines setpoint based on the signal it receives at the 4 20ma terminals on the connection board The setpoint temperature F equals the signal current ma divided by 0 09 example a signal of 10ma will cause a setpoint of 10 0 09 110 F DHW SETPT SETPOINTS This is the setpoint temperature for the boiler outlet water or header water temperature when the DHW Demand terminals see a closed contact DHW tank temperature control calls for heat for example OP LIMIT SETPOINTS This is the temperature at the boiler outlet or header sensor that will cause the control to shut down on high temperature limit It must be high enough above the upper end of the heat band to avoid nuisance cycling The maximum setting is 205 F Example If the boiler setpoint is 180 F and the heat band is 30 F the upper end of the heat band is 180 30 2 195 F The limit band see below must be set at 10
49. or temperatures remotely using digital commands from a Building Management System 6 The master boiler assumes the role of MEMBER RTU 192Kb 8 bits Even Parity 1 stop bit when connected to a BMS 7 The Member Boilers should not be connected to a BMS system other than to view read only addresses MODBUS registers 1 See Table 3 page 14 Table 4 page 14 and Table 5 page 15 for register requirements 2 The system setpoint timer and system setpoint work in tan dem to externally control the op erating setpoint 3 The setpoint countdown timer should be loaded with a timeout value in seconds prior to writing the system set point 4 When the timer reaches zero the control assumes that the BMS is no longer operating and the local setpoint saved on the master control is reloaded S This isa fail safe feature used to help safeguard the system in case of BMS failure 6 Ifthe setpoint timer is not written a default timeout value of 60 seconds is assumed 7 To write the system clock registers 40009 40015 must first be loaded with the correct date and time Then a 1 must be written to register 16 to write the date and time to the system clock Method 2 HeatNet modulation BMS control Table 3 Modbus holding read write registers Valid Values Range lt 40001 Unsigned Boiler System Enable Disable 0 Disabled Off Fa i peenaa Re 40004 Unsigned Outdoor Air Reset Enable Disable
50. ough page 29 When adjusting the limit band operating limit OP LIMIT local setpoint LOC SETPOINT and DHW setpoint make sure the operating temperature bands do not overlap or cause potential for nuisance cycling System clock Set the system clock on all boilers to ensure the time stamps will be accurate in the data logs Turn on the power to each boiler and set the on off switch to ON as you set its parameters Use the boiler s keypad to enter the parameters as described on page 22 After setting a boilers parameters turn the power off to the boiler until you are ready to start the boiler up following the Boiler manual instructions Start up boilers per KN Boiler manual l 2 Turn off power to all boilers Follow all instructions in the KN Boiler manual to start up each boiler and verify operation Start the system l 2 Turn off power to all boilers Connect all call for heat wiring to the boilers Turn on power to all boilers and turn the on off switches to ON The boilers should now operate normally as described in the Boiler manual The remote 4 20mA controller will sequence and modulate boilers as necessary to control the water temperature P N 42 9452 8 08 Copyright Hydrotherm Table6 Control parameters Parameter When to set see notes HEAT BAND Set LOC SETPOINT AUX FUNCTIONS DO NOT use SYSTEM CLOCK LOCAL ADD DO NOT use MODULAR BOILER MODULATION PID PASSWORD COMMUNICAT
51. per and dangerous operation Verify proper operation after servicing Failure to comply with the above could result in severe personal injury death or substantial property damage The electrical connections to this boiler must be made in accordance with all applicable local codes and the latest revision of the National Electrical Code ANSI NFPA 70 Installation should also conform to CSA C22 1 Canadian Electrical Code Part I if installed in Canada Install a separate 120 volt 15 amp circuit for the boiler A properly rated shut off switch should be located at the boiler The boiler must be grounded in accordance with the authority having jurisdiction or if none the latest revision of the National Electrical Code ANSI NEFPA 70 Line voltage field wiring of any controls or other devices must use copper conductors with a minimum size of 14 awg Use appropriate wiring materials for units installed outdoors Overview control setup sequence Aav BAND N CAUTION Follow the Boiler manual Install the boilers according to the KN Boiler manual before attempting to set up the control system This method can be used for from 1 to 5 boilers Install all boilers per the Boiler manual Close the external gas valve on every boiler Wire all boilers following the guidelines in this section DO NOT install a header sensor on any of the boilers Disconnect the wires to the boilers Remote Enable terminals and any override wiri
52. r damper motor qo gt np nuu n Water flow a switch if used i Remove factory jumper across FLOW E A M a E ee Factory wiring DO NOT change B A a a a a a a O O O a SWITCH terminals when using a flow switch Combustion Lp air damper Proving motor if switch used Connect combustion air damper ONLY to the master boiler Dry contact out to remote alarm Alarm contact closes on open or shorted sensor ignition lockout flow switch or user interlock combustion air damper failure blocked flue or blocked air inlet ONO Om H ovac Fused service switch by installer Power to 120 VAC n circulator E A M 120 VAC o mm Gnd DO NOT directly connect circulator if motor is over 1 4 HP Use a motor contactor M o OA WATER WATER HEADER OUT IN Outdoor Return nsor water Postpu rge if sed bfa circulator KN 2 only Supply 4Sed Header This circulator is factory sensor sensor pipe and wired It circulates Boiler circulator factory REQUIRED or boiler system circulator installed water in the boiler after to boiler Install a header shutdown to prevent This circulator must be supplied piped and outlet sensor in an overtemperature in the wired by the boiler installer See the suggested immersion well top of the boiler DO NOT piping diagrams in the Boiler manual for Connect ONLY remove or use in any circulator application and piping IMPORTANT to the m
53. requires an outdoor sensor when enabled LOW WATER OUTDOOR AIR y These temperatures determine the reset curve for HI OA SET OA SETPTS 2 ee 7 supply water temperature High water at low outside air means the design water temperature CS 5 a for maximum load at ODT or outside design HI WATER i E temperature for the installation The other end of LOW OA air temperature z the reset curve is the low water temperature at high n T outside air temperature The low water temperature e meate airtemperature O O is generally equal to room temperature meaning z no 5 A O X 0 0 W A no heat input to the space would occur below this s OUTSIDE AIR TEMPERATURE F outside air temperature DELTA ENABLE PUMP OPTIONS The boiler pump can be set to run after boiler shutdown to distribute residual heat to the heating system Delta enable causes the boiler pump to run until the temperature difference between boiler inlet and outlet is less than DELTA TEMP see below The pump will continue to run an additional period after this for the amount of time specified in PURGE TIME below DELTA TEMP PUMP OPTIONS When DELTA ENABLE above is set to ON the boiler pump will run until the temperature difference across the boiler is less than DELTA TEMP The pump will run an additional time equal to the PURGE TIME An inlet temperature sensor is required this option must be set to 0 to prevent dead heading the pump ALWAYS ON If
54. rm Alarm contact closes on open or shorted sensor ignition lockout flow switch or user interlock combustion air damper failure blocked flue or blocked air inlet All boilers can be connected to alarm by wiring in parallel Factory wiring a DO NOT change DO NOT directly connect W lt circulator if motor is over 1 4 HP o Use a motor contact or relay N q a 120VAC Power to circulator o e H Fused service switch by installer N Gnd 120 VAC Do 6 Postpurge circulator KN 2 only a Boiler circulator or boiler system circulator KN USER S CONTROL MANUAL I Method 1 HeatNet modulation local control on IAR Indoor Air Reset wiring when used Heat Demand terminal connections The end switch leads from the zone valves must connect to the Heat Demand terminals on the electrical connection board as shown in Figure 7 page 9 See Figure 6 for typical wiring to the IAR inputs when using 4 wire zone valves without a zone controller For other applications such as circulator relays or zone controllers see Appendix A in the Boiler manual CAUTION Polarity The connections to the IAR positive terminals IAR must be to the same location on the zone valve as the thermostat wire as shown in Figure Al The connections to the IAR negative terminals IAR must be from the zone valve terminal connected to the 24VAC common line as shown Connecting the wires incorrectly can cause
55. rotation scheme selected There are up to three sensors OUTSIDE HEADER and RETURN Type Z is for a thermistors sensor as supplied by HydroTherm None means do not use this sensor ON OFF looks for an external dry contact closure Use this function only if the response to a sensor indicates the control calibration may be off Calibrate the control by attaching a 10k precision resistor across the sensor terminals Select YES after CALIBRATE The control will measure the resistance and establish a trim value in ohms for the sensor input The control display will show the trim value setting The trim value must not exceed 200 ohms If it does verify that the resistor is correctly connected If so the sensor input is bad Contact HydroTherm for recommended action If the trim setting is acceptable press the SELECT key to accept The display will show TRIM VALUE SET After a slight delay the display will return to the sensors menu P N 42 9452 8 08 Copyright Hydrotherm KN USER S CONTROL MANUAL 4 Control menus and adjustments continued Table 8 Setup menus parameter explanations continued CHANGE PASSWORD ADVANCED SETUP Use to set change a password PASSWORD BAUD ADVANCED SETUP Not changeable Always 19200 COMMUNICATIONS PARITY ADVANCED SETUP Select even or odd as required by communications port used COMMUNICATIONS ADVANCED SETUP Select YES only if a modem is installed
56. tact across each boiler s Remote En able contact in order for the boiler to fire See Figure 16 page 19 for wiring Notice that the boiler 4 20mA terminals are wired in series IAR Indoor Air Reset wiring apply ONLY if using space heating override mode IAR can only be used if one or more of the boilers is wired and piped for override operation Override would occur when a contact closed across the Heat Demand terminals While this contact is closed the boiler will operate based on local control including feedback for IAR if wired If override operation will be used and you want to operate with IAR when in override mode follow the instructions under Method 1 in this manual to wire for IAR Sensor wiring Header sensor cannot be used when the boilers are configured for remote operation by a 24 mA source Outdoor reset application can be done only in over ride mode To operate with outdoor reset purchase and install an outdoor sensor Mount the sensor such that it is shielded from direct sunlight if possible and not likely to be covered by snow drifts or debris Connect the outdoor sen sor leads to the master boiler s electrical connection board as shown in Figure 8 page 10 Member boilers could have their own outdoor sensor if they will be operated in over ride mode by closing the Heat Demand terminals Return water temperature sensor The return wa ter temperature sensor is optional only needed if you
57. the yellow LED on the communication port of the missing boiler NORMAL connection LED should flash steadily about twice per second TERMINATION incorrect LED will flash rapidly and stay on OPEN connection LED does not flash at all If a FAULT message is displayed clear the faults until the STANDBY message is displayed Refer to troubleshooting suggestions at the end of this manual if you cannot resolve the issue 1254567 oSHELDEPF Start the system oe SY a Turn off power to all boilers Connect all call for heat wiring to the boilers Turn on power to all boilers and turn the on off switches to ON The boilers should now operate normally as described in the Boiler manual The master boiler will sequence and modulate boilers as necessary to control the water temp erature The master boiler will show the number of boilers firing as well as the temperature and heat band display Use the UP DOWN keys to scroll through the displays to watch the process of starting and stopping boilers P N 42 9452 8 08 Copyright Hydrotherm Figure 10 RS485 communications board view 485 Bottom 3 see item 20 page 0 page 3 Rs485 T see item 2 RJ45 HeatNet cable IN from master or previous member RJ45 HeatNet cable OUT to next member boiler Shielded wire 3 2ire option to RJ45 cable Heat Net communications INPUT and connection for additional boilers on the network Shielded wire option to RJ
58. trical connection board Located in center panel on boiler right side All field and boiler wiring connects here 2D 2d I 2d 2D 26 Of ff O iii N ine oe on All boiler wiring is made with non interchangeable plug in harnesses connected to this board P N 42 9452 8 08 Copyright Hydrotherm Wiring connections Power wiring 120 vac Heat demand input DHW demand input Low fire terminals High fire terminals To boiler outlet water temperature sensor To optional outdoor temperature sensor To optional boiler return water temperature sensor To optional header temperature sensor To boiler postpurge pump factory piped and wired To boiler circulator Alarm output dry contacts To external high limit and or low water cutoff if desired To flow switch when used Used to activate combustion air damper if desired To combustion air damper proving switch required when controlling combustion air damper Indoor air reset inputs connect to up to 8 zone thermostats Optional 20 ma control signal input Remote enable to start when operating on 20 ma input Optional HeatNet communications board Boiler wiring socket to blower and gas valve Boiler wiring socket to pressure switches and Fenwal control Boiler wiring socket to control panel Boiler wiring socket to control panel Boiler wiring socket to power switch Boiler wiring socket to transformer Termination DIP switches
59. trol menus and adjustments continued Table 8 Setup menus parameter explanations continued Under Explanation IA RESET INDOOR AIR Activate indoor air reset by setting this to ON Zone wiring must be made to the IAR input terminals for IAR to operate See the Boiler manual for details on wiring to the IAR terminals AVG TIME INDOOR AIR The averaging time AVG TIME is the time span over which the control averages the results of zone demands Leave this setting at the factory default unless directly otherwise by HydroTherm Technical Support SET IAR SETPTS INDOOR AIR Leave the delta temp settings at factory default settings unless directed otherwise by HydroTherm Technical Support The determine how much the control adjusts maximum allowable firing rate based on its monitoring of zone demand outdoor sensor when enabled OA SETPT OUTDOOR AIR The boiler and its circulator shut down when the outside air temperature is above this setting if outdoor air shutdown is enabled ON This requires an outdoor sensor when enabled OA SHUTDOWN OUTDOOR AIR When outdoor air shutdown is enabled ON the boiler and its circulating pump shut down when the outside temperature is above the outdoor air setpoint OA SETPT This requires an OA RESET OUTDOOR AIR Set to ON to enable resetting the boiler outlet temperature or header temperature based on outside air temperature Set to OFF to disable outdoor reset This
60. ures the boiler won t make sudden unnecessary changes in firing rate Multiple boiler operation The HeatNet control easily interfaces with other HeatNet controls Multiple boiler operation using HeatNet protocol only requires RJ45 cables daisy chained from boiler to boiler and a few key strokes setting up control behavior The master boiler is automatically selected by connecting a sensor lead to its HEADER sensor terminals The HeatNet control recognizes the sensor and configures the boiler as the master Other boilers only need to have an address assigned Among the advanced design features of the HeatNet control is the MOD MAX setting This limits the firing rate of all boilers to a pre set maximum 50 by default This means all of the boilers will be run at a very efficient level until all boilers are on Only then can firing rate increase above this setting Boiler rotation can be first on first off first on last off or true rotation the HeatNet control monitors the total on time of all boilers and rotates their usage so the total on time is the same for all P N 42 9452 8 08 Copyright Hydrotherm KN USER S CONTROL MANUAL The KN boiler HeatNet control KN Control panel Located on boiler front shown with keypad cover removed Two line fluorescent display shows boiler status and setup menu navigation RUN 75 LOC SET sea ORS Keypad provides navigation and selection for readouts and boiler setup Elec
61. using its display keypad Set the master boiler s termination DIP switches Set the termination DIP switches on the member boilers Set the member boilers control parameters using their display keypads D oT Sw Follow the instructions in the Boiler manual to start up each boiler before proceeding further 10 Finish by connecting cables between the communications boards of all of the boilers and verifying network operation Add communications modules o 1 InsertaRS485 communications module onto each of the boilers electrical connection 15 amp panels as shown in Figure 1 fused service Power supply 120 VAC ai 1 See Figure 1 and Figure 2 Gnd NO H 2 Connect minimum l4awg copper wire to the power connection as shown in Figure 2 3 Install a fused service switch mounted and installed in accordance with all appli 120VAC 60HZ 1Ph cable codes Power to boiler bO 6 P N 42 9452 8 08 Copyright Hydrotherm KN USER S CONTROL MANUAL Method 1 HeatNet modulation local control on Circulator wiring Postpurge circulator KN 2 only The circulator shipped installed with the boiler can not be used for system circulation It must be used as supplied from the factory It circulates water after the boiler stops firing to prevent potential damage from heat pocket ing in the top of the heat exchanger The postpurge circulator is factory piped and pre wired Do not change the usage the wiring the l
62. want to automatically control the boiler postpurge pump cycle time Install the sensor in a well in the boiler return piping Connect the sensor leads to the electrical connection board as shown in Figure 8 page 10 Each boiler requires a return water temperature sensor DHW wiring ONLY if using DHW override mode The boiler or boilers must be piped with isolation valves and wired for override operation Override of the 4 20mA input will occur if a contact closes across the boiler s DHW Demand terminals To operate the boiler for domestic water heating with a storage tank install and pipe the tank according to the tank manufacturer s instructions and the recommended piping diagrams in this manual Consult the factory for applica tions not covered The circulator used for DHW must be operated by a circula tor relay or zone controller that is activated when the tank aquastat calls for heat Connect the tank aquastat terminals across the DHW DEMAND terminals on the master boiler s electrical con nection board as shown in Figure 7 page 9 Member boilers could be connected to tank aquastats if they are piped appropriately and intended to operate in override mode External interlocks Wire external limits and flow switch when used as shown in Figure 17 page 20 The combustion air interlocks cannot be used when operat ing with a 24 mA remote control Combustion air damper control must be done by the remote control syste
63. y you specified when programming for the damper Also check to make sure the prove switch is working properly If there is no proving switch you must put a jumper wire across input connection USER INTRLK If these steps have been done and you continue to get the error message check the sensor TYPE specified in the SENSORS menu If it is set to NONE the controller will not recognize the closed circuit Set the Sensor type to ON OFF There may exist a grounding problem with the controller or one of the boilers pumps contactors or other devices connected to it If all grounding is correct there may be an issue with radiated or induced electrical noise interference This may be caused by arcing across a contactor s contacts when starting a pump motor or a large electrical load It may also be caused by the ignition transformer being improperly grounded or the spark gap being out of adjustment Attempt to identify the noise source What is the boiler controller trying to do at the time of the failure Is the boiler on the same circuit as the noise source The boiler should have isolated power Are shielded sensor wires used Ensure the shields are grounded only at the boiler control end Are any sensors or sensor wires located near a transmitting antenna Move sensor Check the settings for OA SETPOINT and OA RESET 1 Ifthe outdoor air temperature is above the OA SETPOINT and OA RESET is on the circulator pump relay will be locke

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