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Service Manual
Models: 50 - 210
This manual must only be
WARNING
used by a qualified heating
installer / service technician.
Read all instructions,
including this manual and the
Knight Wall Mount
Installation and Operation
Manual, before installing.
Perform steps in the order
given. Failure to comply
could result in severe personal
injury, death, or substantial
property damage.
Save this manual for future reference.
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Contents 2. MAINTENANCE CONTENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Maintenance and Annual Startup . . . . . . . . . . . . . . . . . . 23-27 Hazard Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 3. TROUBLESHOOTING PLEASE READ BEFORE PROCEEDING . . . . . . . . . . . . 3 Before Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Handling Ceramic Fiber Materials . . . . . . . . . . . . . . . . . . . 3 Check Con
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Service Manual Please read before proceeding Installer – Read all instructions, When calling or writing about the boiler – WARNING NOTICE including this manual and the Knight Please have the boiler model and serial Wall Mount Installation and Operation number from the boiler rating plate. Manual, before installing. Perform steps Consider piping and installation when in the order given. determining boiler location (see the Knight User – This manual is for use only by a Wall Mount Installation
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Service Manual Please read before proceeding When servicing boiler – �To avoid electric shock, disconnect electrical supply before performing maintenance. �To avoid severe burns, allow boiler to cool before performing maintenance. Boiler operation – � Do not block flow of combustion or ventilation air to the boiler. � Should overheating occur or gas supply fail to shut off, do not turn off or disconnect electrical supply to circulator. Instead, shut off the gas supply at a location extern
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Service Manual What is in this manual? Service Maintenance � Service and maintenance schedules Near boiler piping � Address reported problems � Typical system components � Inspect boiler area and boiler interior � Clean condensate trap The Knight wall mount boiler display � Check all piping for leaks � Display panel readout, buttons and their functions � Check air openings � Flue vent system and air piping Control module inputs � Check water system � Control module inputs and options � Check exp
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Service Manual 1 Service Near boiler piping This piping reference is included to specify the Near Boiler Piping specific to the Knight wall mount boiler. This piping scheme is important for proper operation of the SMART SYSTEM control. See the Knight Wall Mount Installation and Operation Manual for more detailed piping diagrams. 6
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Service Manual 1 1 Ser Service vice (continued) The Knight wall mount display 7
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Service Manual 1 1 Ser Service vice Control inputs GAS PRESSURE SWITCH DHW THERMOSTAT ROOM THERMOSTAT / ZONE CONTROL LOW VOLTAGE CONNECTION FLOW SWITCH BOARD SYSTEM SENSOR OUTDOOR SENSOR SEQUENCER / BUILDING MANAGMENT SYSTEM LOW WATER CUTOFF INLET TEMPERATURE SENSOR OUTLET TEMPERATURE / HIGH LIMIT SENSOR FLUE GAS SENSOR AIR PRESSURE SWITCH FLAME SENSOR BLOCKED DRAIN SWITCH SMART CONTROL MODULE DISPLAY PANEL PC INTERFACE 8
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Service Manual 1 1 Ser Service vice (continued) Control outputs 9
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Service Manual 1 1 Ser Service vice General Operation Access modes How the boiler operates User The Knight wall mount boiler uses an advanced stainless steel heat exchanger and an electronic control module that allows The user can adjust space heating set point using the UP and fully condensing operation. The blower pulls in gas and air DOWN buttons at any time during normal operation. By and pushes flue products out of the boiler through the heat entering the USER code (0704), the user can
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Service Manual 1 1 Ser Service vice (continued) Sequence of operation Table 1A Sequence of operation - space heating and DHW OPERATION DISPLAY BLR: Standby 1. Upon a call for heat, the control turns on the appropriate pumps (system and boiler pumps for space heating call; DHW pump OUT: 123.8F(129) for DHW call). 2. The control connects 120 vac to the blower. The blower does not run at this time. • If the unit is equipped with a flow switch or low water cutoff, it must close before the cont
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Service Manual 1 1 Ser Service vice Sequence of operation (continued) Table 1A (continued from previous page) Sequence of operation - space heating and DHW OPERATION DISPLAY 8. If the DHW thermostat remains on for more than 30 minutes, and the space heating call for heat is also on, then the control will turn on the boiler pump, turn off the DHW pump after 2 BLR: SH 41% RATE seconds, and resume modulating based on the space heating OUT: 123.0F(129) set point. As long as both the space h
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Service Manual 1 1 Ser Service vice (continued) Display panel menu access Table 1B Use this procedure to access menus from the display panel 13
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Service Manual 1 1 Ser Service vice Display panel parameter access Table 1C This is a typical example of accessing a parameter, shown for parameter I2, boiler pump delay 14
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Service Manual 1 1 Ser Service vice (continued) Parameter table Table 1D This table lists SMART SYSTEM control module parameters and where to access them USER ACCESS INSTALLER ACCESS SEE MENU SUB ITEM DESCRIPTION PAGE DISPLAY MODIFY DISPLAY MODIFY 1 Boiler Model 17 Yes No Yes No 2 User Code 17 Yes Yes Yes Yes 3 Date and Time 17 Yes Yes Yes Yes 4 Software Version 17 Yes No Yes No A 5 Temperature Units 17 Yes Yes Yes Yes 6 Night Setback Temperature 17 Yes Yes Yes Yes 7 Night Setback Times 17 Yes
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Service Manual 1 1 Ser Service vice Parameter table (continued) Table 1D (continued from previous page) This table lists SMART SYSTEM control module parameters and where to access them USER ACCESS INSTALLER ACCESS SEE MENU SUB ITEM DESCRIPTION PAGE DISPLAY MODIFY DISPLAY MODIFY 1 Anti-cycling Time 20 No No Yes Yes Return Temperature Differential for 2 20 No No Yes Yes G Ending Anti-Cycling 3 Ramp Delay On/Off 20 No No Yes Yes SH Controlling Sensor 1 21 No No Yes Yes (Outlet/System, Inlet) SH
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Service Manual 1 Service Viewable and changeable control parameters Before changing parameters, note the settings so that the unit can be returned to its original operating CAUTION parameters. A: General Night setback times Boiler model The control will display “Knight Boiler” as the model number If parameter A6 is set to anything other than 32°F, the night because the same control is used on several models. This will be setback feature becomes active. This will require start and stop display
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Service Manual 1 1 Ser Service vice SH Differential E: DHW settings The SH differential sets how many degrees below the turn off DHW boiler set point temperature the temperature has to go before the boiler will turn on. This parameter can only be changed by the installer When a DHW call for heat becomes active, the control will by accessing parameter B5. The temperature range of this use the DHW boiler set point to determine the firing rate of parameter is 0°F to 86°F. The default value is
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Service Manual 1 1 Ser Service vice (continued) Figure 1-1 Outdoor Air Reset Curve Maximum SH set point Outdoor air shutdown differential When the outdoor temperature drops to or below its The outdoor air shutdown differential parameter is the minimum setting (F1) the water temperature will be at this number of degrees below parameter F5 the outdoor air point, if the SH set point is set higher (FIG. 1-1). This temperature must go before the boiler will respond to a SH parameter can be changed
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Service Manual 1 1 Ser Service vice Boost temperature G: Anti-cycling If a SH demand lasts longer than the programmed time delay Anti-cycling time setting (F9) and there have been no DHW demands, the control will increase the water temperature set point by the Once a SH demand has been satisfied, a set amount of time amount in this parameter. If the SH demand continues must elapse before the control will respond to a new SH through another time period, the set point will be increased demand.
