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HydroTherm KN-2 Control Manual

Cast iron condensing boiler
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See also: User Manual , Instruction and Installation Manual
Th is manual is intended only for use by a qualifi ed 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.
the burner, resulting in possible severe personal injury, death or substantial property damage. Th e 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.
Affi x these instructions near to the boiler/water heater. Instruct the building owner to retain the instructions for future use by a qualifi ed
service technician, and to follow all guidelines in the User' s Information Manual.
Cast iron condensing boilers
Cast iron condensing boilers
Models K N-2 and K N-4
Models K N-2 and K N-4
Control manual
Control manual
Control adjustment and
Control adjustment and

operation instructions

operation instructions
Also read and follow:
Also read and follow:
KN
KN
KN
KN
Construction dust and particulate, particularly drywall dust, will cause contamination of
K N
S e r i e s
Boiler manual
Boiler manual
Vent/air manual
Vent/air manual
P/N 42-9452 8/08 Copyright Hydrotherm
KN-2/4-CM2-808

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Summary of Contents for HydroTherm KN-2

  • Page 1: Operation Instructions

    Affi x these instructions near to the boiler/water heater. Instruct the building owner to retain the instructions for future use by a qualifi ed service technician, and to follow all guidelines in the User’ s Information Manual. P/N 42-9452 8/08 Copyright Hydrotherm...
  • Page 2 , fi rst-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...

  • Page 3: Wiring Connections

    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 components P/N 42-9452 8/08 Copyright Hydrotherm...
  • Page 4 KN USER’S CONTROL MANUAL The KN boiler — with HeatNet control P/N 42-9452 8/08 Copyright Hydrotherm...

  • Page 5: Table Of Contents

    Refer to this section for the menu structure and explanations of the sett ing options. Control panel 5 Troubleshooting ......page 31 P/N 42-9452 8/08 Copyright Hydrotherm...

  • Page 6: Method 1: Heatnet Modulation - Control

    Close the external gas valve on every boiler. Wire all boilers following the guidelines in this section. Att ach a header sensor to the master boiler ONLY. Th e KN-2 control automati- cally confi gures the boiler with a header sensor as the master.

  • Page 7: Boiler Circulator

    • 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 .
  • Page 8 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 mode.) P/N 42-9452 8/08 Copyright Hydrotherm...
  • Page 9 KN USER’S CONTROL MANUAL Method 1: HeatNet modulation – local control (cont.) Figure 7 KN wiring summary — wiring to electrical connection board Also see Figure 2, page 6. P/N 42-9452 8/08 Copyright Hydrotherm...
  • Page 10 Method 1: HeatNet modulation – local control (cont.) Figure 8 KN wiring summary — wiring to electrical connection board, continued (see Figure 7, page 9, for terminal strip locations) Also see Figure 5, page 7. (KN-2 only) P/N 42-9452 8/08 Copyright Hydrotherm...
  • Page 11 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. Th e switch is “on” when in the down position and “off ” when in the up position.
  • Page 12 Heat page 13). Th e other end of this cable will be att ached to the fi rst member boiler in Demand terminals (requires outdoor sensor connected to boiler). following steps. P/N 42-9452 8/08 Copyright Hydrotherm...
  • Page 13 Th e master boiler will show the number of boilers fi ring as well as the temperature components except the RS485 interface board. 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...

  • Page 14: Method 2: Heatnet Modulation - Bms

    Th en, a 1 Air Prove UV Sensor Interlock Master Boiler must be writt en to register 16 to write the date and time to Main Valve Present (Boiler Detected) the system clock. P/N 42-9452 8/08 Copyright Hydrotherm...

  • Page 15: Building Management System

    + Register 30) = Boiler 1 runtime in seconds. Boiler 1 is the master boiler. Boilers 2 – 16 are Allow the master boiler to initialize. member boilers. Verify operation with the building management system. P/N 42-9452 8/08 Copyright Hydrotherm...

  • Page 16: Method 3: External 4-20Ma Control

    See Figure 11 and Figure 12. Connect minimum 14awg 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. P/N 42-9452 8/08 Copyright Hydrotherm...
  • Page 17 • 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 .
  • Page 18 The boiler (or boilers) must be piped with isolation . Override of valves and wired for override operation the 4-20mA input will occur if a contact closes across the Priority 3 = 4-20mA Input/Enable boiler’ s DHW Demand terminals. P/N 42-9452 8/08 Copyright Hydrotherm...
  • Page 19 KN USER’S CONTROL MANUAL Method 3: External 4-20ma control (continued) Figure 16 KN wiring summary — wiring to electrical connection board P/N 42-9452 8/08 Copyright Hydrotherm...
  • Page 20 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) (KN-2 only) P/N 42-9452 8/08 Copyright Hydrotherm...
  • Page 21 Heat Th e remote 4-20mA controller will sequence and modulate boilers as necessary to Demand terminals (requires outdoor sensor connected to boiler). control the water temperature. P/N 42-9452 8/08 Copyright Hydrotherm...

  • Page 22: Control Menus And Adjustments

    Continuing to press the DOWN key will access these menu options: • BOILERS • SETPOINTS • INDOOR AIR • PUMP OPTIONS • NIGHT SETBACK • OPTIONS • LOG/RUNTIME • AUX FUNCTIONS • SYSTEM CLOCK • ADVANCED SETUP P/N 42-9452 8/08 Copyright Hydrotherm...
  • Page 23 °F {°F or °C} TEMP SCALE °F KEY CLICK ON {ON or OFF} KEY CLICK SKIP PASSW ON {ON or OFF} SKIP PASSW BRIGHTNESS 50% {12, 25, 37, 50, 62, 75, 87, 100%} BRIGHTNESS 50% P/N 42-9452 8/08 Copyright Hydrotherm...
  • Page 24 ARE YOU SURE> NO FACTORY SET? NO {YES or NO} FACTORY SET? ARE YOU SURE> NO {YES or NO} ARE YOU SURE> NO SYSTEM UPDATE CTRL? ARE YOU SURE> NO {YES or NO} UPDATE CTRL? P/N 42-9452 8/08 Copyright Hydrotherm...
  • Page 25 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).
  • Page 26 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...
  • Page 27 This is the minimum wait time before an additional boiler can fi re 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...
  • Page 28 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.
  • Page 29 Plug a USB cable into the control connection board, with the other connected to the computer. THE CABLE MUST BE CONNECTED BEFORE STARTING 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 fi rst box.

  • Page 30: Troubleshooting

    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 notifi cation of setback activity. P/N 42-9452 8/08 Copyright Hydrotherm...
  • Page 31 All boilers in a system must have the same fi rmware revision (version). boilers connected. The amber ❑ Verify the proper termination is set on the Master and the last Member boiler. light blinks on all of the boilers communication’s jacks. P/N 42-9452 8/08 Copyright Hydrotherm...
  • Page 32 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...

This manual is also suitable for:

Kn-4Kn series

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