HydroTherm HeatNet KN -6 User Information
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HydroTherm HeatNet KN -6 User Information

Kn series gas-fired direct vent cast iron boilers
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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.
KN
Gas-fired direct vent
Cast iron boilers
Models:
KN -6, -10, -16, -20, -26, -30
HeatNet
Control adjustment and operation instructions
for Advanced Thermal Hydronics firmware
version 1.8
This instruction manual applies only to
Thermal Hydronics
firmware version 1.x on
version 3.x control boards. Current firmware is
backwards compatible with version 1.x & 2.x
boards, but some current features may not be
available. To replace firmware on an existing
boiler, contact the factory to obtain the original
firmware file or for assistance in applying current
firmware to an older version control board.
Also read and follow:
KN-Series Gas Boiler Installation
and Operating Instructions
Copyright 2014 Mestek, Inc
KNV3-1020
Series
®
V3
Advanced
.

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Summary of Contents for HydroTherm HeatNet KN -6

  • Page 1 KNV3-1020 Series Gas-fired direct vent Cast iron boilers Models: KN -6, -10, -16, -20, -26, -30 HeatNet ® Control adjustment and operation instructions for Advanced Thermal Hydronics firmware version 1.8 Advanced This instruction manual applies only to Thermal Hydronics firmware version 1.x on version 3.x control boards.

  • Page 2: Table Of Contents

    TABLE OF CONTENTS HeatNet Control V3 2.x TABLE OF CONTENTS TABLE OF CONTENTS ..........................2 Introduction ............................... 4 KN-S V3 H .............................. 4 ERIES ONTROL Features & Specifications ......................... 6 ................................ 6 TANDARD EATURES VERVIEW Specifications ............................8 Components & Accessories ........................9 ................................
  • Page 3 TABLE OF CONTENTS HeatNet Control V3 2.x Security ..............................33 Saving Configuration Settings ........................ 33 USB Features ............................33 Diagnostics .............................. 34 Blower Protection ............................ 34 Communications ............................35 Failsafe Modes ............................35 FAILSAFE REQUIREMENTS: ............................... 35 Flow Options ............................36 HeatNet Online ............................

  • Page 4: Introduction

    FEATURES & SPECIFICATIONS HeatNet Control V3 2.x The HIGH LIMIT circuit is independent of Introduction the control and shuts down the ignition control and the boiler if the control board or other component of the boiler was to malfunction. The control will continue to The KN-Series V3 HeatNet Control function and report the fault, but its ability to control the boiler will end.
  • Page 5 FEATURES & SPECIFICATIONS HeatNet Control V3 2.x 100%. This ―boiler efficiency‖ clamp is defaulted to 70% In a stand-alone installation the Member typically receives and thus limits all of the boilers individual outputs to 70% its command signals internally and operates based upon the until the last boiler fires.

  • Page 6: Features & Specifications

    FEATURES & SPECIFICATIONS HeatNet Control V3 2.x firmware program that always remains resident so that a Features & Specifications factory program can be restored. Primary loading is with a flashdrive. HeatNet Version 3.x Discontinued Support for High Efficiency Ametek blowers. Features from Version 2.x Control 10.
  • Page 7 FEATURES & SPECIFICATIONS HeatNet Control V3 2.x 10. Menu driven calibration and setup menus with a bright 23. Remote 4-20mA setpoint control using a mapped (Adj.) 4 line Vacuum Fluorescent Display. setpoint range to the 4-20mA control signal. 11. (8) Dedicated 24vac interlock monitors, and 8 dedicated 24.

  • Page 8: Specifications

    FEATURES & SPECIFICATIONS HeatNet Control V3 2.x 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 (v2.x), 8A 250 VAC resistive K8 on J4.2 &.6 for Base Loading version 2.x Control 24 VAC –...

  • Page 9: Components & Accessories

    Components & Accessories Part Number Component 02-4297 KN-Series Control Board Version 3.x 02-4278 Graphics Display Board Color Touch Panel Display 02-3926 ACI/10K-CP-BP Temperature probe (bullet type, 1x.250 inch) 02-4283 ACI 10k-CP-I-NW Supply, Header, Return Sensors 02-4285 ACI CP-I-2.5‖ Sensor with well 02-4286 ACI CP-I-4‖...

  • Page 10: Setup & Operation

    SETUP & OPERATION HeatNet Control V3 2.x The Master now checks all of the runtimes to determine SETUP & OPERATION which boiler has the least runtime based on the MIN RUNTIME setting in ADVANCED SETUP:FIRING MODE:. The MIN RUNTIME setting is the minimum runtime interval in hours that is used to compare boiler to Basic Multi Boiler System Operation boiler runtimes.

  • Page 11: Mixed Boiler Types Using Priority Sets

    SETUP & OPERATION HeatNet Control V3 2.x valve from terminal 9 to J5 Main Valve. The H-Net Mixed Boiler Types Using display indicates 'Run'. Priority Sets 10. If main-flame is detected the H-Net control holds the burner at the low-fire rate for the MODULATION Using the Basic Multi Boiler System Operation, a MIXED DELAY time period.
  • Page 12 SETUP & OPERATION HeatNet Control V3 2.x A boiler‘s firing Priority can be designated as such in: configured as PRIORITY 1 with the highest runtime will be ADVANCED SETUP:SYSTEM:BOILER TYPE:FIRING stopped LAST (example). As long as the stop condition and PRIORITY : 1 menu on each boiler.

  • Page 13: Start/Stop Priority Conditions

    SETUP & OPERATION HeatNet Control V3 2.x temperature on the Master is used to provide a difference Start/Stop Priority Conditions temperature across the heat exchanger. A System Return sensor will be required. However, the return temperature The following is an example using mixed sensor may have been moved on the Master to provide condensing and non-condensing boilers: system return temperature on existing installations and is...

  • Page 14: Selecting Mixed Boilers

    SETUP & OPERATION HeatNet Control V3 2.x The return water temperature sensor would Total System BTUs. need to be moved from the Master‘s return Desired Effective Turndown. This is the lowest inlet to the system return. The EXCHGR firing rate of the system relative to the maximum firing DELTA may need to be adjusted in rate of the system.
  • Page 15 SETUP & OPERATION HeatNet Control V3 2.x added. The min fire rate is equal to the minimum BTUs that If redundancy is not required, the min inputs of the can be delivered to the system. Priority 1 boilers may be summed to lower the Mod Max % value so smaller Priority 1 boilers can be used.
  • Page 16 SETUP & OPERATION HeatNet Control V3 2.x EXCEPTION NOTES: of 60%, each KN6 can run to 360M (720M total) before a KN10 is called ON (Add Delay timer set long enough). Mixing more than two different size/type boilers Once both KN6s are running and the KN10 is then called on becomes more complex than the scope of this manual.
  • Page 17 SETUP & OPERATION HeatNet Control V3 2.x Figure 9 Boiler System Response 2 Figure 11 Boiler System Response 4 (1) KN6, (1) KN20, 60% Mod-Max (2) KN2s, (3) KN6s To correct this would require the KN6 to set the MOD- The above Boiler System Response 4 graph illustrates MAX to roughly 90% (Boiler System Response 3: not as another system where 80% is used as the MOD-MAX...

  • Page 18: Mixed System Type 2: Condensing / Non-Condensing

    SETUP & OPERATION HeatNet Control V3 2.x Figure 12 Mixed Boiler System Mixed System Type 2: Condensing / Non-Condensing System Effective Priority 1 Priority 2 MMBTU Turndown KN 5:1 MB/MW 3:1 This mixed system may also have mixed boilers with FIII 750, differing sizes as outlined in the Mixed System Type 1: 3.45...
  • Page 19 SETUP & OPERATION HeatNet Control V3 2.x not happen. Even then, the load may be too great. The When this condition is in effect, the STATUS * screen will indicate “blr offline”. While the boiler is in this “not following note will explain an alternative way (not available”...
  • Page 20 SETUP & OPERATION HeatNet Control V3 2.x KN Boiler Btu Chart (MBH) KN10 KN20 KN30 Input Input 200M 800M 1.6M 2.4M 700M 1.4M 2.1M 600M 1.2M 1.8M 1.5M Page 20...

  • Page 21: Base Loading, Relay Control

    CONTROL METHODS HeatNet Control V3 2.x Enable the base load feature by setting: Base Loading, Relay Control ADVANCED SETUP:SYSTEM:OPTION to BASE LOAD. This setting the OPTION Relay to be used as control for a Base Load Boiler. The control has the ability to control (1) base load boiler using the K8 Relay contacts on J4 pins 2 &...
  • Page 22 CONTROL METHODS HeatNet Control V3 2.x Not Preferred: There is no overlap. A selection for stopping the boiler now needs to be determined. Setting the Stop qualifier; Example of having a larger Base Load boiler that is not of Modulation to 40% or a low fire rate will shut the Base the modulating type: If there is a 6 Million BTU Base Load Load boiler off and allow the (3) smaller boilers to modulate boiler running with (3) 2 million BTU HeatNet boilers, a...

  • Page 23: Setting Up Base Loading

    CONTROL METHODS HeatNet Control V3 2.x Return Water Temperature Setting up base loading START menu item: The relay contact will The base load boiler is controlled using a set of contacts to close to enable the boiler when the RET read enable it (location J4).

  • Page 24: Heating Control Methods

    CONTROL METHODS HeatNet Control V3 2.x Short cycling may occur when a firing rate is Heating Control Methods sent to a member boiler that would cause the supply temperature to raise high enough to trip the operating limit (low flow rate). After An overview of the (5) methods for controlling the KN the supply temperature falls, the boiler would series boiler are presented here.

  • Page 25: Heating Method 1 Heat Demand

    CONTROL METHODS HeatNet Control V3 2.x Priority 2 Figure 17 Heat demand input The HEAT DEMAND input is the next, and provides the means to operate the boiler in LOCAL MODE when an external control is not present, has failed, or needs to be enabled or disabled.

  • Page 26: Stage Control T1-T2

    CONTROL METHODS HeatNet Control V3 2.x 4-20ma control signal to a setpoint mapped between The AA, HEAT DEMAND (LOCAL) input, the H-Net, the 50F and 220F. These (2) temperatures are adjustable to 4-20ma input will all override the stage control inputs. provide a setpoint range.
  • Page 27 CONTROL METHODS HeatNet Control V3 2.x Protocessor option Heating Method 5 MODBUS communications An optional BACnet or LonWorks bridge module can be used to connect the MODBUS network to a BACnet or The fifth method uses an RS485 digital communications LonWorks network.

  • Page 28: Using The 4-20Ma Input (Optional)

    OPTIONAL FEATURES HeatNet Control V3 2.x Figure 23 4–20ma enable connection Using the 4-20ma input (OPTIONAL) The 4-20ma input is designed to operate per the ISA-50.1 standard. It will support Type 2, Type 3, and Type 4 Transmitter/Receiver circuits. The Type 2 and Type 3 circuit may use the supplied +24VDC and 24VDC RET connections (J10B) to power a remote transmitter.

  • Page 29: Setpoint Priorities

    OPTIONAL FEATURES HeatNet Control V3 2.x For non Ametek blowers, the minimum setting linked to the BOILER START x.xxma where this starting of the boiler is calibrated so that the minimum current is the lower setpoint. So, if we set the 4ma PWM signal to control the Blower motor is SETPOINT to 130F and the 20ma SETPOINT at 180F we 20%.

  • Page 30: Circulator Pump Options

    OPTIONAL FEATURES HeatNet Control V3 2.x Figure 25 Local & DHW Pump connections Circulator Pump Options There are provisions for a system pump(s) and a local pump. This is to allow for primary/secondary loop configurations. The system circulator pump is implemented using the K4, K13 RELAY and normally open contacts at J13 SYSTEM PUMP 1 and SYSTEM PUMP 2.
  • Page 31 OPTIONAL FEATURES HeatNet Control V3 2.x prove, the control changes to the first pump and If (2) pumps are available, pump rotation is available. The attempts to prove flow. This cycle will continue rotation of the (2) pumps can be controlled using two indefinitely until flow is established.

  • Page 32: Auxiliary Function Options

    OPTIONAL FEATURES HeatNet Control V3 2.x jumper on the control board is in position 0-10 or 4-20mA as Outdoor Reset required. The Outdoor reset feature allows the water setpoint Auxiliary Function Options temperature to change dynamically with the outside air temperature.

  • Page 33: Sensors

    OPTIONAL FEATURES HeatNet Control V3 2.x when a contact is closed across this input. This can be used as Security a Domestic Hot Water demand input. Another function of the OUTDOOR RESET is the A password can be used to lock out control and setup features. It can be enabled, but is shipped in the disabled state.

  • Page 34: Diagnostics

    OPTIONAL FEATURES HeatNet Control V3 2.x Selecting USB CABLE requires connecting a USB cable and After (5) attempts the H-Net control will lock out and display running the Firmware Update program from a PC. This call service. process takes much longer and requires a Personal Computer (laptop) to be taken to the boiler site.

  • Page 35: Communications

    OPTIONAL FEATURES HeatNet Control V3 2.x run locally if communications is lost and this timer Communications expires due to the lack of being updated. The H-Net control has the ability to communicate using the The system setpoint timer and system setpoint work in MODBUS protocol with a building management system.

  • Page 36: Flow Options

    OPTIONAL FEATURES HeatNet Control V3 2.x temperature at which the boiler will turn ON. Once the The Building Management System (BMS) also has the ability temperature at this sensor falls below the LOW TEMP to limit the # of HeatNet boilers allowed to fire. When a temperature the boiler will start and fire to its LOCAL system has a fixed amount of boilers that HeatNet reports are setpoint.

  • Page 37: Heatnet Online

    OPTIONAL FEATURES HeatNet Control V3 2.x Enter LOWEST FLOW: (The automatic value loaded will equal the lowest flow required for this boiler (it is adjustable). It should be equal to the Boilers Limited Control: This feature allows the BMS lowest flow of the largest boiler in the system). to directly change the amount of boilers that HeatNet can control.
  • Page 38 OPTIONAL FEATURES HeatNet Control V3 2.x Once the user has logged in, a selection screen for the building sites the user has registered will be displayed. When a building site is selected, the main Live screen will be entered. This is the HOME screen and provides a quick view on the status of the site.

  • Page 39: Domestic Hot Water Methods

    OPTIONAL FEATURES HeatNet Control V3 2.x remember to remove the any call for heat including the OR Domestic Hot Water Methods OVR input. Domestic Hot Water control is supported using (6) methods. When the MASTER TYPE is set to MIXED the When using the Domestic Hot Water methods, the wire MODULAR BOILER SET menu will contain (2) separate jumper, JPS1 on each control board providing Domestic Hot...
  • Page 40 OPTIONAL FEATURES HeatNet Control V3 2.x UPPER DHW DIFF) and boilers are firing. After that the DHW pump relay remains energized after a DHW call for heat ends: the DHW SETPOINT has been satisfied. A. The pump will remain on during a post A.

  • Page 41: Dhw Method 2: Combination Dhw And Space Heating Using A Master Boiler And Member Boiler(S)

    OPTIONAL FEATURES HeatNet Control V3 2.x 12. Set the HYB SENSOR = OFF. This sensor is be enabled or disabled much in the same way as the Heat selectable for Method 5A only. Demand input for space heating. Now in the, The DHW pump is individually controlled on each boiler ADVANCED SETUP:DISTRIBUTED CTRL: that fires in DHW.
  • Page 42 OPTIONAL FEATURES HeatNet Control V3 2.x may require in its backup role. Then one of the local DHW correctly will limit the maximum tank control methods can be used to implement DHW heating. temperature to the (DHW SETPOINT + UPPER DHW DIFF).

  • Page 43: Dhw Method 3: Dhw Heating Using A Header Sensor Input

    OPTIONAL FEATURES HeatNet Control V3 2.x begins, what to do with the local pump/valve is PURGE TO THE: This does not need to be set on determined: MEMBER boilers, only the MASTER boiler. NO The local pump/valve will remain running during HYB SENSOR: = OFF.

  • Page 44: Dhw Method 4: Space Heating With Dhw Override Of Setpoint On Master

    OPTIONAL FEATURES HeatNet Control V3 2.x the tank setpoint is set to 140F and the heat band 14. Enter the DOMESTIC HOT WATER MENU. is set to 10F, then the tank temperature will rise When prompted for DHW BOILER?, enter NO. to 145F before the first boiler turns off (setpoint =140F +/- heat band/2).
  • Page 45 OPTIONAL FEATURES HeatNet Control V3 2.x sensor‘s temperature drops below the DHW Setpoint + DOMESTIC HOT WATER:DHW PRIORITY is set Lower Diff). The boiler will stop space heating (if running) to NO. The DHW pump will be enabled whenever and switch to DHW heating. The DHW pump/valve will be there is a DHW call for heat.
  • Page 46 OPTIONAL FEATURES HeatNet Control V3 2.x 30. Scroll down to USE SENSOR? Press the Method 5B using a Thermostat & Sensor. SELECT key and select YES, then press the SELECT key again. This will allow the boiler to Method 5(B) can also be used in a hybrid mode on control the local tank or DHW loop temperature Member boilers with a thermostat connected to the OR using the DHW sensor.

  • Page 47: Dhw Method 6: Dhw Using Direct Control

    OPTIONAL FEATURES HeatNet Control V3 2.x Supply sensor will limit the temperature/firing rate of the boiler, but may not be sufficient for continuous demand or speed in heating the tank. It is already available, so no additional sensor is needed. Return sensor will allow the boiler to run its supply temperature up quickly, but may bounce off of the operating limit band.

  • Page 48: Wiring Connections

    OPTIONAL FEATURES HeatNet Control V3 2.x Wiring Connections Figure 28 Dip Switches and Wiring Wire Strip Length. .42” or If the terminal blocks are of the screwless type, the wire should be stripped to 10.67mm. to .25” or 6.34mm. If the terminal blocks are of the screw type, the wire should be stripped 4-20mA Input JS1: select, See:...
  • Page 49 WIRING CONNECTIONS HeatNet Control V3 2.x Figure 29 Heating Method 1 H-Net, Master/member RJ45 HeatNet In and Out The (2) LEDs on the RJ45 indicate: GREEN: Transmit Data YELLOW: Received Data HeatNet Boiler to Boiler Communications 3 wire Shielded HeatNet In and Out HeatNet Termination.
  • Page 50 WIRING CONNECTIONS HeatNet Control V3 2.x Figure 30 Heating Methods 2 and 4: AA-High Fire and High/Low, master or member boiler Heating Mode 4: High Fire Close this contact to run boiler at Highfire. Heating Mode 2: Stage Control Inputs. T1 or T2 Closed: Lowfire T1 &...
  • Page 51 WIRING CONNECTIONS HeatNet Control V3 2.x Figure 31 Heating Method 3 4–20 ma/ 0-10 VDC 24 VDC Return Channel 2: Channel 1: 4-20mA/0-10VDC 4-20mA/0-10VDC 24 VDC S6 along with the SETUP:ADVANCED:4-20mA INPUT menu configures the channel for operation. S6 switch 1 DOWN: 4-20mA channel 1 S6 switch 1 UP: 0-10VDC channel 1 S6 switch 2 DOWN: 4-20mA channel 2...
  • Page 52 WIRING CONNECTIONS HeatNet Control V3 2.x Heating Method 5: MODBUS (Optional BACnet or LonWorks bridge — Protocessor) Figure 32 The (2) LEDs on the RJ45 indicate: GREEN: Transmit Data YELLOW: Received Data RJ45 Cat 5 Modbus 3 wire Shielded Modbus Modbus Termination.
  • Page 53 WIRING CONNECTIONS HeatNet Control V3 2.x Figure 33 Relays, Interlocks and Boiler Status The Highest priority SYSTEM FLOW PROVE --------- Low Water Cutoff------------------- Variable Frequency Drive -------- Gas Pressure (High & Low) ----- Spare for user or Factory ------ Operator------------------------------ Water Flow Switch----------------- Factory ------------------------------ Low Voltage...
  • Page 54 WIRING CONNECTIONS HeatNet Control V3 2.x Figure 34 Temperature sensors (REQUIRED) Water Temperature INLET (return) of Boiler All Temperature Sensors are 10k Thermistors. (OPTIONAL) Water Temperature Immersion sensors require a well. Common System Supply (Header) IF CONNECTED, BOILER = MASTER (OPTIONAL) DHW Temperature Domestic (REQUIRED)
  • Page 55 WIRING CONNECTIONS HeatNet Control V3 2.x Figure 35 Typical Single Boiler System HEADER SENSOR (Determines Master Boiler) #4 SYSTEM PUMP LOCAL PUMP OUTDOOR ENABLE #14 ENABLE #8 DHW TANK SENSOR FLOW PROVE #9 FLOW PROVE AQUASTAT #13 North Away From Exhaust DHW TANK RETURN SUPPLY...
  • Page 56 WIRING CONNECTIONS HeatNet Control V3 2.x Figure 36 Using a 4–20ma signal for direct modulation A control signal greater 20mA than 4.2mA (adjustable) will start boiler. Output Range From No Effect Control Control Signal Once boiler starts the control signal must Display input % of control when running drop below 4.01 mA to stop Boiler...
  • Page 57 WIRING CONNECTIONS HeatNet Control V3 2.x Figure 37 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. SETUP MENU:AUX FUNCTIONS DAMPER Prove Switch...
  • Page 58 WIRING CONNECTIONS HeatNet Control V3 2.x Figure 38 Failsafe common system pump wiring MEMBER BOILER 1 120 VAC Return DPST Relay Add additional relays/ contacts for more boilers System Flow Prove Switch 120VAC 120VAC 120 Return MASTER BOILER System Pump Voltage Return System Pump Voltage Feed System Pump...

  • Page 59: Calibration

    Calibration HeatNet Control V3 1.x Calibration Press the arrow keys until MIN VFD is shown in the display, along with the minimum percentage value at which The calibration of the KN-Series boiler the boiler is to run at min fire. While in Standby (no call for should only be performed by a heat on inputs), the minimum percent may be preset.

  • Page 60: Log Entry

    LOG ENTRY HeatNet Control V3 1.x of boilers that are displayed is limited to 7 if the boiler is the Log Entry MASTER. If boilers #8 and up need to be viewed, the Boiler Control Pro software will need to be used. The Last 2 characters on the fourth line indicate the heating mode the The KN-Series H-Net control contains a log that records the control is in.

  • Page 61: Default Settings & Menu Item Descriptions - Setup

    DEFAULT SETTINGS & MENU ITEM DESCRIPTIONS HeatNet Control V3 2.x Default Settings & Menu Item Descriptions — SETUP DEFAULT MENU RANGE DESCRIPTION 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 62 DEFAULT SETTINGS & MENU ITEM DESCRIPTIONS HeatNet Control V3 2.x If ROTATION is set to PUMP HRS, ROTATE TIME is used to switch pumps when the pump‘s time difference is greater than ROTATE TIME. Whichever pump has the least time and is at least below the other (pump‘s time - ROTATE TIME) will switch to the enabled state.
  • Page 63 DEFAULT SETTINGS & MENU ITEM DESCRIPTIONS HeatNet Control V3 2.x TIME 12:00AM Time of the day to end the setback OPTIONS F TEMP SCALE (F or C) Fahrenheit scale is default KEY CLICK Beeps when a key is pressed SKIP PASSWORD Disables the Password BRIGHTNESS (25, 50,75,100)
  • Page 64 DEFAULT SETTINGS & MENU ITEM DESCRIPTIONS HeatNet Control V3 2.x in LOCAL. The boiler will continue to run in LOCAL until communications are re-established or this entry is set to OFF. This entry may be set to one of the temperature sensors: SUPPLY, HEADER, RETURN, or turned OFF (default).
  • Page 65 DEFAULT SETTINGS & MENU ITEM DESCRIPTIONS HeatNet Control V3 2.x screen. Setting determines where the TEMP DISAB return sensor‘s 135F – 200F TEMP<140F threshold temperature disables the boiler from firing. This time may be used to remove condensation that is still present on the heat exchanger after the boiler has finished running.
  • Page 66 DEFAULT SETTINGS & MENU ITEM DESCRIPTIONS HeatNet Control V3 2.x DHW heating. When this happens, the boiler will not shut down, but keep running during the change from space heating to DHW (Hot Swap). Once the DHW cycle completes, the boiler will shut down and wait to be called for space heating again.

  • Page 67: Default Settings & Menu Item Descriptions - Advanced Setup

    DEFAULT SETTINGS & MENU ITEM DESCRIPTIONS HeatNet Control V3 2.x location to maintain a setpoint at that location. RETURN In DHW Method 5A will maintain the DHW setpoint at the RETURN sensor when the OR OVR input is closed. SYSTEM CLOCK TIME DAY OF WEEK This time needs to be entered at first turn-on and in the event that...
  • Page 68 DEFAULT SETTINGS & MENU ITEM DESCRIPTIONS HeatNet Control V3 2.x boiler. A boiler is stopped immediately when the top of the heat band is exceeded. If a second boiler needs to stop, the SHEDBOILER DELAY will need to expire before stopping. MODULATE DELAY This is the time the boiler remains in min-fire before it relinquishes (0 –...
  • Page 69 DEFAULT SETTINGS & MENU ITEM DESCRIPTIONS HeatNet Control V3 2.x FIRING MODE LOFO: Boilers are fired Last On, First Off starting with Lead Boiler FOFO: Boilers are fired First On, First Off TRUE: Boilers are fired based on the runtime they report back to the Master boiler.
  • Page 70 DEFAULT SETTINGS & MENU ITEM DESCRIPTIONS HeatNet Control V3 2.x SUPPLY outlet, water RETURN inlet, and system HEADER temperature. If the HEADER sensor is used (TYPEZ), that boiler performs the tasks of the MASTER boiler. If the HEADER sensor is set to NONE, its function is the MEMBER.
  • Page 71 DEFAULT SETTINGS & MENU ITEM DESCRIPTIONS HeatNet Control V3 2.x update of its value to keep from timing out and returning control to H-Net control. If set to ―OFF‖, MODBUS always has control and on a loss of MODBUS communications, H-Net does not assume control.
  • Page 72 DEFAULT SETTINGS & MENU ITEM DESCRIPTIONS HeatNet Control V3 2.x 4-20mA. If the INPUT TYPE is set to BMS, a Flow Limited or a Boilers Limited method can be used. With Flow limited a GPM value can be written to the BMS GPM Modbus register 40019 with a valid flow.
  • Page 73 DEFAULT SETTINGS & MENU ITEM DESCRIPTIONS HeatNet Control V3 2.x switch placed in the CAL position. If the control is power cycled in this condition, the factory program will overwrite the existing running program. If in the LOAD FIRMWARE menus, STORAGE LOCATION 0 will be an allowed storage location.

  • Page 74: Modbus Communications

    MODBUS COMMUNICATIONS HeatNet Control V3 2.x MODBUS Communications The KN-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 75 MODBUS COMMUNICATIONS HeatNet Control V3 2.x Figure 40 MODBUS Input/Output Variables (Read/Write) Address Name Raw Data Type Scale Description Valid Values/Range Set real time clock – year (see SetClock) 0 – 99 40012 SetYear 8 bit unsigned Set real time clock – hour (see SetClock) 0 –...
  • Page 76 MODBUS COMMUNICATIONS HeatNet Control V3 2.x Figure 41 MODBUS Input Variables (Read Only) Raw Data Address Name Scale Description Valid Values/Range Type 1 (Monday) – 7 (Sunday) 30015 Weekday 8 bit unsigned Real time clock weekday. 30016 Boiler01Status1 30017 Boiler01Status2 30018 Boiler02Status1 30019...
  • Page 77 MODBUS COMMUNICATIONS HeatNet Control V3 2.x Figure 41 MODBUS Input Variables (Read Only) Raw Data Address Name Scale Description Valid Values/Range Type 30055 Boiler04RuntimeLow16 Example 30056 Boiler05RuntimeHigh16 Boiler01Runtime = 30057 Boiler05RuntimeLow16 (Boiler01RuntimeHigh16 * 65536) + Boiler01RuntimeLow16 30058 Boiler06RuntimeHigh16 30059 Boiler06RuntimeLow16 Boiler01 = Master 30060 Boiler07RuntimeHigh16...
  • Page 78 MODBUS COMMUNICATIONS HeatNet Control V3 2.x Figure 41 MODBUS Input Variables (Read Only) Raw Data Address Name Scale Description Valid Values/Range Type 30095 Boiler16Status3 ----- The following registers are available starting in firmware version 2.0 ----- 30096 Boiler01SupplyTemp 30097 Boiler02SupplyTemp 30098 Boiler03SupplyTemp 30099...
  • Page 79 MODBUS COMMUNICATIONS HeatNet Control V3 2.x Figure 41 MODBUS Input Variables (Read Only) Raw Data Address Name Scale Description Valid Values/Range Type 30134 Boiler04CyclesHigh16 Boiler##CyclesHigh16:Boiler##Cycles Low16 30135 Boiler04CyclesLow16 30136 Boiler05CyclesHigh16 Example Boiler01Cycles = 30137 Boiler05CyclesLow16 (Boiler01CyclesHigh16 * 65536) + Boiler01CyclesLow16 30138 Boiler06CyclesHigh16 30139...
  • Page 80 MODBUS COMMUNICATIONS HeatNet Control V3 2.x Figure 41 MODBUS Input Variables (Read Only) Raw Data Address Name Scale Description Valid Values/Range Type 30174 Boiler15Status4 30175 Boiler16Status4 30176 … RESERVED 30207 30208 Boiler01DHWTemp 30209 Boiler02DHWTemp 30210 Boiler03DHWTemp 30211 Boiler04DHWTemp 30212 Boiler05DHWTemp 30213 Boiler06DHWTemp 30214...
  • Page 81 MODBUS COMMUNICATIONS HeatNet Control V3 2.x Figure 41 MODBUS Input Variables (Read Only) Raw Data Address Name Scale Description Valid Values/Range Type 3) A calculated setpoint if running in Outdoor Air Reset Mode 4) The 4-20ma (0-10V) setpoint. 16 bit signed 0 - 16 The maximum number of boilers available 30241...
  • Page 82 MODBUS COMMUNICATIONS HeatNet Control V3 2.x MODBUS — BoilerStatus1 Flags Figure 42 Description Valid Values/Range Return Sensor not Detected 0 = detected, 1 = not detected Outside Sensor not Detected 0 = detected, 1 = not detected System Pump 0 = off, 1 = on Combustion Air Damper 0 = off, 1 = on Obsolete –Available only on v1.x controls...
  • Page 83 MODBUS COMMUNICATIONS HeatNet Control V3 2.x MODBUS — BoilerStatus3 Flags Figure 44 AA High Fire 0 = off, 1 = on Heat Demand (Local Override) 0 = off, 1 = on (1) 4-20ma Remote Enable 0 = off, 1 = on Outdoor Air Reset Override 0 = off, 1 = on 0 = off, 1 = on...
  • Page 84 TROUBLESHOOTING HeatNet Control V3 2.x BoilerStatus4 Flags Description Valid Values/Range DHW Enabled (1) 0 = off, 1 = on (menu) DHW Mode had been enabled in the menus. Combustion Air Damper Prove (1) 0 = not proven, 1 = proven Status of Combustion Air Damper Prove Input J12B Call Service Fault 0 = off, 1 = on...

  • Page 85: Troubleshooting

    TROUBLESHOOTING HeatNet Control V3 2.x Situation: Troubleshooting The display is displaying random characters or the control keeps resetting. There may exist a grounding problem with the controller or This section is included as an aide to help troubleshoot one of the boilers, pumps, contactors or other devices problems with the setup and operation of the boiler.
  • Page 86 TROUBLESHOOTING HeatNet Control V3 2.x Minimize the electrical interference by routing the Situation: communications cable away from electrical noise The boilers menu only indicates 1 boiler, but there sources, such as: Motors, ignition controls, are member boilers connected and the amber light contactors etc…...
  • Page 87 TROUBLESHOOTING HeatNet Control V3 2.x Situation: the firing rate is changing, but the display You have forgotten the password. indicates it is running at the same modulation rate. The Boiler always shows it‘s called for firing As a last resort, you can turn the controller off, then depress and hold the ESC key while turning it back on.
  • Page 88 TROUBLESHOOTING HeatNet Control V3 2.x If the Member boiler is in Local Mode then it also and a shielded twisted wire is STRONGLY would not be called and report unavailable to the suggested. Master. The HeatNet LonWorks and BACnet bridges plug If the Local flow switch for the Local pump is directly into Revision 2.x+ boards.
  • Page 89 TROUBLESHOOTING HeatNet Control V3 2.x seconds (10 minutes) to the setpoint timer. If after 10 Newer firmware versions allow the SETPOINT minutes (5 minutes longer than the normal write TIMER failsafe feature to be disabled by writing a zero interval) the BMS has not written the timer, the saved (0) to the timer.

  • Page 90: Kn Heatnet Control Run Screen

    OPERATION HeatNet Control V3 2.x KN HeatNet Control Run Screen Press the UP or DOWN Arrow Keys MASTER:SYSTEM SET to navigate the display screen. MEMBER: LOCAL SET SYSTEM SET Hold theBACK LOCAL SET SYSTEM SET RUN %100 RUN %100 If the Header Sensor is present the button down menu will display SYSTEM SET, for 5 seconds...

  • Page 91: Kn Heatnet Control Run Screen - Continued

    OPERATION HeatNet Control V3 2.x KN HeatNet Control Run Screen - Continued CALIBRATE SYS FLOW RUN %100 SYS FLOW RUN %100 DHW STATUS RUN %100 DHW STATUS RUN %100 START 0 START 0 STOP STOP DHW screens are available depending DHW: RUN %100 DHW:...

  • Page 92: Kn Heatnet V3 Menu Tree - Advanced Thermal Hydronics

    OPERATION HeatNet Control V3 2.x KN HeatNet V3 Menu Tree — ADVANCED THERMAL HYDRONICS HOME SCREEN Press and HOLD BACK SYSTEM SET RUN %100 button down for 5 seconds to enter the 140°F menu screen MAIN MENU SCREEN S E T UP K N 3 0 V 2 .

  • Page 93: Kn Heatnet V3 Advanced Menu Tree - Ath

    OPERATION HeatNet Control V3 2.x KN HeatNet V3 Advanced Menu Tree – ATH ONTROL ONTROL D I S T R I B U T E D C T R L D I S T R I B U T E D C T R L M O D U L A R B O I L E R S E T M O D U L A R B O I L E R S E T...

  • Page 94: Worksheet

    WORKSHEET HeatNet Control V3 REV 2.x Worksheet SETUP MENU BOILERS # of BOILERS LEAD STAGE HEAT BAND ° SETPOINTS SYSTEM/LOCAL SETPOINT ° OPERATE LIMIT ° OP LIM BAND ° SETPOINT SOURCE OUTDOOR AIR RESET ° OA RESET WARM WEATHER SD WWS SETPOINT °...
  • Page 95 WORKSHEET HeatNet Control V3 REV 2.x REMAINS ON: LOCAL PUMP VFD FLOW PROVE NIGHT SETBACK SETBACK ENTRY ENTRY IS SETBACK ° ° ° ° SETBACK TIME START DAY TIME END DAY TIME OPTIONS TEMP SCALE ° KEY CLICK SKIP PASSWORD BRIGHTNESS LOG/ RUNTIME RUN HOURS...
  • Page 96 WORKSHEET HeatNet Control V3 REV 2.x DHW PRIORITY? POST PURGE USE SENSOR? SHARING LOCAL PUMP OFF LOCAL DELAY PURGE TO THE HYB SENSOR: SYSTEM CLOCK ADVANCED SETUP DISTRIBUTED CTRL CONTROL MASTER TYPE H-NET ADDRESS MODBUS ADDRESS MODULAR BOILER SET SPACE HEATING ADD BOILER DELAY SHED BOILER DELAY MODULATE DELAY TIME...
  • Page 97 WORKSHEET HeatNet Control V3 REV 2.x FIRING PRIORITY PREDICT START BASE LOADING BASE LOAD BOILERS: START > MOD STOP DELAY TIME SENSORS SENSOR # OUTDSIDE SUPPLY R E T U R N H E A D E R DHW TYPE 4-20mA INPUT ANALOG IN CHANNEL: CHANNEL MODE:...
  • Page 98 WORKSHEET HeatNet Control V3 REV 2.x BOILER TYPE PRODUCT CONDENSING BTU IN BLOWER MASS TURNDOWN ALTITUDE CALIBRATION SETTINGS MIN VFD IGN VFD MAX VFD Page 98...

  • Page 99: Type Ii Thermistor Resistance/Temperature Table

    HeatNet V3 2.x Type II Thermistor Resistance/Temperature Table Temp C Temp F Temp C Temp F Resistance Resistance 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 25,391 587.6 19,899 510.6 15,711 445.2 12,492...

  • Page 100: Status Information

    HeatNet V3 2.x * 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 101 HeatNet V3 2.x 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 OFF time has not expired.

  • Page 102: Status Screen Fault Display

    APPENDIX A HeatNet V3 2.x LOW WATER CUTOFF: Status Screen Fault Display If there is a low water condition reported by the low water cutoff switch this fault is displayed. Check that there is water There are numerous interlock switches and software flow and water in the boiler.
  • Page 103 APPENDIX A HeatNet V3 2.x 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 position closes the LOCAL PUMP/VALVE relay. It then waits 10 reported was originally detected, but has since opened.
  • Page 104 APPENDIX A HeatNet V3 2.x DELTA TEMPERATURE WARNING: If the temperature difference across the boiler and measured from RETURN water to SUPPLY water exceeds ―EXCHGR DELTA‖ this message will be displayed. This can be set to an alarm condition in the AUX FUNCTIONS menu.

  • Page 105: Line 4 Log Entries

    APPENDIX B HeatNet V3 2.x 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 be SETBACK EXPIRED displayed in the log.
  • Page 106 APPENDIX B HeatNet V3 2.x Line # 4 Message Description This log entry occurs when the temperature across the heat exchanger has HIGH DELTA TEMP been greater than the EXCHR DELTA T RANGE degrees F. After 24 hours of continuous runtime the ignition control module needs to check it‘s UV detection circuit.
  • Page 107 APPENDIX B HeatNet V3 2.x Line # 4 Message Description HEADER SENSOR, DHW SENSOR If a call is made to the ignition control to start and the HeatNet control detects AIR SWITCH(BLOWER) 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.
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