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Cadet 40-120 Installation And Service Manual

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CAD-I-S Rev H
Installation & Service Manual
Models: 40 - 120
This manual must only be used by
WARNING
a qualified heating installer / service
technician. Read all instructions,
in this 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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Summary of Contents for Cadet 40-120

  • Page 1 CAD-I-S Rev H Installation & Service Manual Models: 40 - 120 This manual must only be used by WARNING a qualified heating installer / service technician. Read all instructions, in this manual before installing. Perform steps in the order given. Failure to comply could result in severe personal injury, death, or substantial property damage.

  • Page 2: Table Of Contents

    HAZARD DEFINITIONS ............ 2 6. HYDRONIC PIPING PLEASE READ BEFORE PROCEEDING ......3 System Water Piping Methods ......... 34 THE CADET HEATING BOILER -- HOW IT WORKS .... 4-5 Low Water Cutoff Device ..........34 RATINGS ................6 Chilled Water System ............34 1.

  • Page 3: Please Read Before Proceeding

    Installation & Service Manual Please read before proceeding When servicing boiler – Installer – Read all instructions, in this WARNING manual before installing. Perform steps • To avoid electric shock, disconnect electrical supply in the order given. before performing maintenance. User –...

  • Page 4: The Cadet Heating Boiler - How It Works

    Installation & Service Manual The Cadet Heating Boiler - How it works... Heat exchanger 16. Boiler control module Allows system water to flow through specially designed The boiler control responds to internal and external signals coils for maximum heat transfer, while providing and controls the blower, gas valve, and pumps to meet the protection against flue gas corrosion.
  • Page 5 Installation & Service Manual The Cadet Heating Boiler - How it works... (continued) Models 40 - 120 IMG00205 FRONT OF BOILER IMG00202 Front View Bottom View IMG00203 IMG00204 Left Side (inside unit) Right Side (inside unit)

  • Page 6: Ratings

    3" Maximum allowed working pressure is located on the rating plate. NOTICE 7. The Cadet heating boiler input rate, on some models, is Notes: reduced for vent lengths beyond the minimum. Models 1. As an Energy Star Partner, the manufacturer has determined CD(N,L)070 and CD(N,L)100 with 2"...

  • Page 7: Determine Boiler Location

    Provide clearances: substantial property damage. 4. The Cadet heating boiler must be installed so that gas Clearances from combustible materials control system components are protected from dripping 1. Hot water pipes—at least 1/4" from combustible materials.
  • Page 8 Installation & Service Manual Determine boiler location Figure 1-1 Closet Installation - Minimum Required Clearances LEFT For closet installations, CPVC, 12" SERVICE WARNING 6" MINIMUM 0" MINIMUM polypropylene, or stainless steel vent material MUST BE used in a closet structure due to elevated temperatures.

  • Page 9: Provide Air Openings To Room

    Ensure the wall for which the boiler is intended to be mounted is comprised of either, cement, brick, block, or Install air inlet piping for the Cadet heating boiler as described wooden studs spaced 16" apart from center. Ensure the in this manual.

  • Page 10: Corrosive Contaminants And Sources

    Installation & Service Manual Determine boiler location When using an existing vent system to Table 1A Corrosive Contaminants and Sources install a new boiler: Products to avoid: Failure to follow all instructions can result WARNING Spray cans containing chloro/fluorocarbons in flue gas spillage and carbon monoxide emissions, causing severe personal injury Permanent wave solutions or death.

  • Page 11: Removing A Boiler From Existing Common Vent

    Installation & Service Manual Determine boiler location (continued) When removing a boiler from existing common vent system: Do not install the Cadet heating boiler into g. Any improper operation of the common venting system DANGER should be corrected so the installation conforms with a common vent with any other appliance.

  • Page 12: Prepare Boiler

    Start-up, Section 10 of this manual. You must install the propane orifice to BLOWER fire the Cadet heating boiler on propane. Verify when installing that the orifice size VENTURI marking matches boiler size (Table 2A). Failure to comply could result in severe...

  • Page 13: Remove Boiler From Wood Pallet

    See page 9 of this manual for boiler mounting location MOUNTING BRACKET instructions. (FACTORY SUPPLIED) The Cadet heating boiler is not intended NOTICE for floor installation. Mounting to a wood studded wall: The wall mount bracket is designed for a stud spacing of 16 inches from center (FIG.

  • Page 14: General Venting

    Installation & Service Manual General venting Direct venting options - Sidewall Vent IMG00267 IMG00219 Figure PVC/CPVC Concentric Sidewall Figure 3-1 Two-Pipe Sidewall Termination - See Termination - See page 25 for more details page 22 for more details Direct venting options - Vertical Vent IMG00223 IMG00222 IMG00220...

  • Page 15: Install Vent And Combustion Air Piping

    (continued) Install vent and combustion air piping The Cadet boiler must be vented and The Cadet boiler vent and air piping can be installed through DANGER supplied with combustion and ventilation the roof or through a sidewall. Follow the procedures in this air as described in this section.

  • Page 16: Sizing

    Minimum / Maximum allowable combustion air and vent piping lengths are as follows: The Cadet boiler uses model specific combustion air intake Combustion Air = 7 equivalent feet minimum / 100 equivalent and vent piping sizes as detailed in Table 3A below.

  • Page 17: Materials

    Installation & Operation Manual General venting (continued) Materials The PVC, CPVC, or ABS air inlet pipe should be cleaned and sealed with the pipe manufacturer’s recommended solvents Air inlet pipe materials: and standard commercial pipe cement for the material used. The PVC, CPVC, ABS, or Flex Duct air inlet pipe should The air inlet pipe(s) must be sealed.

  • Page 18: Optional Room Air

    Commercial applications utilizing the Cadet heating boiler may be installed with a single pipe carrying the flue products If the boiler combustion air inlet is located...

  • Page 19: Pvc/Cpvc

    Installation & Service Manual General venting (continued) PVC/CPVC: Work from the boiler to vent or air termination. Do not exceed the lengths given in this manual for the air or vent This product has been approved for use with the PVC/CPVC piping.

  • Page 20: Polypropylene

    Installation & Service Manual General venting Polypropylene: All vent connections MUST be secured by NOTICE the vent manufacturer's joint connector This product has been approved for use with polypropylene (FIG. 3-8). vent with the manufacturers listed in Table 3E. All terminations must comply with listed options in this manual Insulation should not be used on WARNING and be a single-wall vent offering.

  • Page 21: Stainless Steel Vent

    Installation & Service Manual General venting (continued) Stainless steel vent: Installation of a stainless steel vent system NOTICE should adhere to the stainless steel vent This product has been approved for use with stainless steel manufacturer’s installation instructions using the manufacturers listed in Table 3G. supplied with the vent system.

  • Page 22: Sidewall Direct Venting Vent/Air Termination - Sidewall

    Installation & Service Manual Sidewall direct venting Vent/air termination – sidewall If using the sidewall termination: Follow instructions below when 3. The air piping must terminate in a down-turned elbow WARNING determining vent location to avoid as shown in FIG. 4-1A. This arrangement avoids possibility of severe personal injury, death, recirculation of flue products into the combustion air...
  • Page 23 Installation & Service Manual Sidewall direct venting (continued) Vent/air termination – sidewall Figure 4-2A Clearance to Gravity Air Inlets w/Field Supplied Fittings Figure 4-1C Alternate Venting Arrangement (if Space Allows) w/Field Supplied Fittings TO BOILER INTAKE AIR COUPLING CONNECTION 12” 12”...

  • Page 24: Prepare Wall Penetrations

    Canadian installations, provide clearances required by CSA B149.1 Installation Code. 3. The air inlet of a Cadet heating boiler is part of a direct vent connection. It is not classified as a forced air intake with regard to spacing from adjacent boiler vents.

  • Page 25: Sidewall Termination - Optional Concentric Vent

    Installation & Service Manual Sidewall direct venting (continued) Sidewall termination – optional concentric vent Description and usage 3. Cut one (1) hole (5 inch diameter for #CVK3003 installations The manufacturer offers optional concentric combustion air or 4 inch diameter for #CVK3008 installations) into the and vent pipe termination kits (Factory Kit #CVK3003 - 3"...
  • Page 26 Installation & Service Manual Sidewall direct venting Sidewall termination – optional concentric vent models Figure 4-8 Concentric Vent Dimensional Drawing Instead of cementing the smaller pipe to 5. Install the Y concentric fitting and pipe assembly through NOTICE the rain cap, a field-supplied stainless steel the structure’s hole.

  • Page 27: Sidewall Termination - Optional Concentric Vent

    Installation & Service Manual Sidewall direct venting (continued) Sidewall termination – optional concentric vent Figure 4-10 Concentric Vent Sidewall Attachment Multiventing sidewall terminations DO NOT use field-supplied couplings to CAUTION extend pipes. Airflow restriction will occur When two (2) or more direct vent appliances are vented near and may cause intermittent operation.

  • Page 28: Vertical Direct Venting Vent/Air Termination - Vertical

    Installation & Service Manual Vertical direct venting Vent/air termination – vertical Follow instructions below when WARNING Figure 5-1A PVC/CPVC/Polypropylene Vertical determining vent location to avoid Termination of Air and Vent possibility of severe personal injury, death or substantial property damage. ALTERNATE INTAKE LOCATIONS: INTAKE PIPES MAY BE LOCATED Determine location...

  • Page 29: Prepare Roof Penetrations

    FIG. 5-2). For Canadian installations, provide clearances required by CSA B149.1 Installation Code. 3. The air inlet of a Cadet heating boiler is part of a direct vent connection. It is not classified as a forced air intake with regard to spacing from adjacent boiler vents.

  • Page 30: Vertical Termination - Optional Concentric Vent

    Installation & Service Manual Vertical direct venting Vertical termination – optional concentric vent Description and usage 2. Cut one (1) hole (5 inch diameter for #CVK3003 installations The manufacturer offers an optional concentric combustion or 4 inch diameter for #CVK3008 installations) into the air and vent pipe termination kit.
  • Page 31 Installation & Service Manual Vertical direct venting (continued) Vertical termination – optional concentric vent DO NOT use field-supplied couplings to Do not operate the appliance with CAUTION WARNING extend pipes. Airflow restriction will occur. the rain cap removed or recirculation of combustion products may occur.

  • Page 32: Alternate Vertical Concentric Venting

    Installation & Service Manual Vertical direct venting Alternate vertical concentric venting This appliance may be installed with a concentric vent Figure 5-8 Concentric Vent Example 1 arrangement where the vent pipe is routed through an existing unused venting system; or by using the existing FLUE EXHAUST unused venting system as a chase for vent and combustion air routing.
  • Page 33 Installation & Service Manual Vertical direct venting (continued) Existing vent as a chase Follow all existing termination and clearance requirements and allowable pipe lengths. Use only approved venting materials listed in the General Venting Section of this manual. Figure 5-10 Existing Vent as a Chase FLUE EXHAUST AIR INLET WITH SCREEN...

  • Page 34: Hydronic Piping

    Hydronic piping System water piping methods General piping information The Cadet heating boiler is designed to function in a closed Basic steps are listed below along with illustrations on the loop pressurized system not less than 12 psi. A temperature following pages (FIG.’s 6-4 through 6-6), which will guide you...

  • Page 35: Near Boiler Piping Components

    The pump MUST be sized to meet 13. Indirect water heaters: the specified minimum flow requirements listed in The Cadet heating boiler may be piped to an indirect Table 6A. Consult the indirect water heater operating water heater to heat domestic hot water with the space heat transfer medium.

  • Page 36: Near Boiler Piping Connections

    Installation & Service Manual Hydronic piping Near boiler piping connections Figure 6-2A Near Boiler Piping w/Y-Strainer VENT AIR CONDENSATE DRAIN TO FLOOR DRAIN DOMESTIC HOT WATER PUMP FROM CHECK INDIRECT VALVE DOMESTIC HOT WATER TANK BOILER PUMP Y-STRAINER TO SYSTEM SEPARATOR (RECOMMENDED) FROM SYSTEM...

  • Page 37: Circulator Sizing

    HEADER IMG00238 Circulator sizing The Cadet heating boiler heat exchanger does have a pressure drop, which must be considered in your system design. Refer to the graph in FIG. 6-3 for pressure drop through the Cadet heating boiler heat exchanger.
  • Page 38 Installation & Service Manual Hydronic piping Figure 6-3 Pressure Drop vs. Flow 40 Model 70 Model 100 Model 120 Model FLOW RATE (GPM) Table 6A Circulator Recommendations for Temperature Rise Applications_20°, 25°, and 35° 20°F Temperature Rise Applications Pump Minimum Pipe Model FT/HD Size...
  • Page 39 Installation & Service Manual Hydronic piping (continued) Figure 6-4 Single Boiler - Primary / Secondary Piping PRESSURE REDUCING VALVE PRESSURE BACKFLOW GAUGE PREVENTER MAKE UP WATER SEPARATOR SYSTEM SUPPLY SENSOR MAY SUBSTITUTE LOW LOSS HEADER (OPTIONAL) FROM SYSTEM SYSTEM NOT TO EXCEED 4 PIPE DIA OR MAX. OF 12" APART SYSTEM BALL VALVE CIRCULATOR...
  • Page 40 Installation & Service Manual Hydronic piping Figure 6-5 Single Temperature Zoned with Circulators - DHW Priority ZONE #1 PRESSURE PRESSURE ZONE #2 ZONE #3 ZONE #4 GAUGE REDUCING VALVE BACKFLOW FLOW CHECK PREVENTER VALVE (TYPICAL) MAKE UP WATER SYSTEM SUPPLY SENSOR ZONE CIRCULATORS (OPTIONAL)
  • Page 41 Installation & Service Manual Hydronic piping (continued) Figure 6-6 Multiple Boilers - Single Temperature Zoned with Circulators - DHW Priority Number of Units Model Required Pipe Sizes 1" 1-1/4" 1-1/4" 1-1/2" 2" 2" 2" 1-1/4" 1-1/2" 2" 2" 2-1/2" 2-1/2" 2-1/2" 1-1/2"...

  • Page 42: Gas Connections Connecting Gas Supply Piping

    Installation & Service Manual Gas connections Connecting gas supply piping 1. Remove the front access panel and refer to FIG. 7-1 2. Support piping with hangers, not by the boiler or its to pipe gas to the boiler. accessories. Install a field supplied sediment trap / drip leg The gas valve and blower will not support upstream of the boiler gas controls.

  • Page 43: Natural Gas

    14 inches w.c. maximum. Figure 7-2 Inlet Pipe with Backup Wrench Propane Gas: WARNING Cadet heating boilers are typically shipped ready to fire on natural gas. Check boiler rating plate to determine which fuel the boiler is set for. If set to natural gas, it may be converted to LP by installing an orifice (see page 12).

  • Page 44: Check Inlet Gas Supply

    5640 5130 4720 Cadet heating boilers are typically shipped ready to fire on natural gas. Check boiler rating plate to determine WARNING which fuel the boiler is set for. If set to natural gas, it may be converted to LP by installing an orifice (see page 12).

  • Page 45: Gas Pressure

    (dynamic) mode. If an in-line regulator is used, it must be a minimum of 10 feet from the Cadet heating boiler. It When re-tightening the set screw, be is very important that the gas line is properly purged by the gas...

  • Page 46: Field Wiring

    Installation & Service Manual Field wiring Line voltage connections ELECTRICAL SHOCK HAZARD – For WARNING your safety, turn off electrical power supply 1. Remove the cover of the metal junction box as shown in before making any electrical connections FIG. 8-1. to avoid possible electric shock hazard.

  • Page 47: Outdoor Temperature Sensor

    3. Connect outdoor temperature sensor (FIG. 8-3) to the 2. Connect the normally open contacts on the flow switch to outdoor sensor terminals on the connection board to these terminals (FIG. 8-3). enable outdoor reset operation of the Cadet heating boiler. System supply sensor Auxiliary limit switch 1.
  • Page 48 Installation & Service Manual Field wiring Figure 8-3 Low Voltage Field Wiring Connections Connection Board Configurations Standard Altitude,Standard Connected (Non-Combi) Standard Altitude, Combi High Altitude, Standard Connected Connected (Non-Combi) High Altitude, Combi Connected...

  • Page 49: Boiler Control

    Installation & Service Manual Field wiring (continued) Figure 8-4 Control Inputs TANK THERMOSTAT ROOM THERMOSTAT / ZONE CONTROL LOW VOLTAGE CONNECTION FLOW SWITCH BOARD SYSTEM SENSOR OUTDOOR SENSOR LOW WATER CUTOFF INLET TEMPERATURE SENSOR OUTLET TEMPERATURE / HIGH LIMIT SENSOR FLUE GAS SENSOR PRESSURE SWITCH FLAME SENSOR...
  • Page 50 Installation & Service Manual Field wiring Figure 8-5 Control Outputs LOW VOLTAGE CONNECTION BOARD BOILER PUMP DHW PUMP IGNITOR BLOWER BOILER CONTROL MODULE GAS VALVE DISPLAY PANEL IMG00259...

  • Page 51: Condensate Disposal Condensate Drain

    Condensate horizontal runs, a second line vent may be from the Cadet heating boiler will be slightly acidic required and tubing size may need to increase (typically with a pH from 3 to 5). Install a neutralizing to 1 inch.

  • Page 52: Startup

    Installation & Service Manual Start-up Check/control water chemistry 3. Fill to correct system pressure. Correct pressure will vary with each application. Do not use petroleum-based cleaning or CAUTION sealing compounds in the boiler system. The minimum cold water fill pressure for a residential system is 12 psi.

  • Page 53: Check For Gas Leaks

    Installation & Service Manual Start-up (continued) Purge air from heat exchanger Figure 10-2 Condensate Trap 1. Attach a 5/16" flexible clear tube (rated for a maximum HOSE BARB temperature of 120°F) over the barbed nipple on the manual air vent as shown in FIG. 10-1. MOUNTING NUT 2.

  • Page 54: Start The Boiler

    5. Is incoming gas pressure less than 4 inches w.c.? property damage. If none of the above corrects the problem, refer to the Cadet heating boilers are typically shipped Troubleshooting Section. WARNING ready to fire on natural gas. Check boiler...
  • Page 55 Installation & Service Manual Start-up (continued) Figure 10-2 Operating Instructions LBL20274 REV A...
  • Page 56 Installation & Service Manual Start-up Check flame and combustion Set space heating operation (continued) Please note that the brackets ([]) denote NOTICE Determine controlling sensor screen status. For space heating systems, the temperature control can be based 3. Place the boiler into the active position by pressing the on the outlet or the system supply sensor (optional).

  • Page 57: Operating Information

    DHW tank. The boiler pump will run during Freeze Protection Mode as well. It will continue The Cadet heating boiler uses an advanced stainless steel heat to run for a short time after the burner turns off or the Freeze exchanger and electronic control module that allows fully Protection Mode ends.

  • Page 58: Outdoor Reset Operation

    High limit operations the inlet and the outlet sensor. If this difference exceeds The Cadet heating boiler is equipped with an adjustable 55°F the control will reduce the maximum fan speed. If automatic reset high limit and a fixed manual reset high the temperature difference exceeds 60°F the control will...

  • Page 59: User Programming Sequence

    Installation & Service Manual Operating information (continued) User programming sequence ON/OFF Press UP for 5 seconds to either Turn On or Off Unit Base State Screen Show Status and Temperatures (Default is Outlet Temperature) Press ENTER for 5 seconds to Enter User Parameters Set Degrees in °C or...

  • Page 60: User/Installer Programming Sequence

    Installation & Service Manual Operating information Installer programming sequence ON/OFF Press UP for 5 seconds to either Turn On or Off Base State Screen Show Status and Temperatures Press ENTER & DOWN for 5 seconds to Enter Installer Menu Set Space Heat Setpoint at MIN Outdoor Temperature - Press UP or...

  • Page 61: Parameter Table

    Installation & Service Manual Operating information (continued) Parameter table Table 11-1 This table lists boiler control module parameters and where to access them User Access Installer Access Code Description Display Modify Display Modify Temperature Units (°C/°F) Set SH Set point Temperature Set DHW Tank Set point Set SH Set point at Minimum Outdoor Temperature Set SH Set point at Maximum Outdoor Temperature...

  • Page 62: Access Modes / Saving Parameters

    Installation & Service Manual Operating information Access modes Table 11-2 Lockout, Blocking and Notification Codes User Error Codes with Explanation Lockout Codes Press the ENTER button for 5 seconds. Invalid Lockout Memory Lockout Installer Fan Speed Fault Flow Switch Fault Flame Out of Sequence Most parameters are available only to the installer, accessible Auto Reset Hi Limit...

  • Page 63: Cadet Heating Boiler Control Module

    Installation & Service Manual Operating information (continued) Cadet heating boiler control module Use the control panel (FIG. 11-1) to set temperatures, operating conditions, and monitor boiler operation. Figure 11-1 Control Panel Indicators MODULATION INCREMENTS (20% INCREMENTS) OF FIRING CONTROL DISPLAY SCREEN...

  • Page 64: Maintenance Maintenance And Annual Startup

    Maintenance Maintenance and annual startup Table 12A Service and Maintenance Schedules Owner maintenance Service technician (see the Cadet Heating Boiler User’s Information (see the following pages for instructions) Manual for instructions) General: • Address reported problems • Check boiler area •...

  • Page 65: Address Reported Problems

    Installation & Service Manual Maintenance (continued) Follow the Service and maintenance procedures given throughout this manual and in component literature WARNING shipped with the boiler. Failure to perform the service and maintenance could result in damage to the boiler or system. Failure to follow the directions in this manual and component literature could result in severe personal injury, death, or substantial property damage.

  • Page 66: Check Expansion Tank

    Installation & Service Manual Maintenance Check expansion tank 2. After following the warning directions in this manual, if 1. Expansion tanks provide space for water to move in the relief valve weeps or will not seat properly, replace the and out as the heating system water expands due to relief valve.

  • Page 67: Removal Of Combustion Chamber Lining

    Review with owner prevent airborne dust.  Remove the combustion chamber lining from the appliance 1. Review the Cadet Heating Boiler User’s Information and place it in a plastic bag for disposal. Manual with the owner.  Wash potentially contaminated clothes separately from 2.

  • Page 68: Cleaning Boiler Heat Exchanger

    Installation & Service Manual Maintenance Cleaning boiler heat exchanger Table 12B Heat Exchanger Cleaning Kit For recommended materials; including brush, appropriate Part Component Model extension(s), refractory cover, and detailed instructions see Number Number Description Table 12B - Heat Exchanger Cleaning Kits. CTN20005 Rear Refractory Cover 40 - 100...

  • Page 69: Troubleshooting

    Installation & Service Manual Troubleshooting Check control module fuses Label all wires prior to disconnection WARNING when servicing controls. Wiring errors can cause improper and ALWAYS check control module fuses NOTICE dangerous operation. Always before replacing control module or any disconnect power to the boiler before major components (blower, etc.).

  • Page 70: Corrective Action

    Installation & Service Manual Troubleshooting Table 13-1 Troubleshooting Chart - No Display FAULT CAUSE CORRECTIVE ACTION - No 120 vac supplied to unit. • Check external line switch, fuse, or breaker. • Check wiring harness connection between display board main control board.
  • Page 71 Installation & Service Manual Troubleshooting (continued) Checking temperature sensors The boiler temperature sensors (inlet water, outlet water, system water, flue, and outdoor air) are all resistance type devices. The following tables show the correct values for the sensors at various temperatures. Use an ohmmeter to read the resistance of the sensor at a known temperature.
  • Page 72 Installation & Service Manual Troubleshooting Table 13-3 Troubleshooting Chart - Noisy System FAULT CAUSE CORRECTIVE ACTION - Supply problem. Natural • Refer Section Connections pressures should be between 4 inches w.c. detailed information concerning the gas supply. and 14 inches w.c. LP gas pressures should be between 8 inches w.c.
  • Page 73 Installation & Service Manual Troubleshooting (continued) Table 13-4 Troubleshooting Chart - Fault Messages Displayed on Boiler Interface ERROR CODE DESCRIPTION CORRECTIVE ACTION • Reset control module. Invalid lockout code. • Switch power OFF and ON. • Replace control module. The control module has detected parameter •...
  • Page 74 • Verify that the boiler is piped properly into the heating system. Refer to Section 6 - Hydronic Piping for the proper piping methods for the Cadet boiler. • Check 120 vac to boiler pump motor on a call for heat. If voltage is not present, check wiring back to the main control board.
  • Page 75 Installation & Service Manual Troubleshooting (continued) Table 13-4 (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface ERROR CODE DESCRIPTION CORRECTIVE ACTION • Inspect spark electrode and associated wiring for damage and connection. Reference page 66 of this manual for removal and cleaning procedures.
  • Page 76 Refer to Section 6 - Hydronic Piping has been corrected. setting. for the proper piping methods for the Cadet boiler. Press the RESET button on the display to reset.) • Check 120 vac to boiler pump motor on a call for heat.
  • Page 77 • Verify that the boiler is piped properly into the heating system. Refer to Section 6 - Hydronic Piping for the proper piping methods for the Cadet The temperature rise across the heat boiler. exchanger has exceeded 60°F.
  • Page 78 Installation & Service Manual Troubleshooting Table 13-4 (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface ERROR CODE DESCRIPTION CORRECTIVE ACTION • Check 120 vac supply to the transformer. • Check wiring connections at the low voltage terminal strip.
  • Page 79 • Check for obstructions at the vent/air intake terminals. Gas Supply Pressure • Refer to Section 7 - Gas Connections for the proper gas supply for the Cadet heating boiler. • Refer to page 66 of this manual for burner removal.

  • Page 80: Combi

    Installation & Operation Manual Combi The Cadet Combi - How it works... DHW pump A field-supplied anti-scald device MUST be WARNING Begins operation when the domestic flow switch enables demand. installed as shown in FIG. 14-3. Anti-scald An integral flow check prevents flow of the boiler water while in devices must be selected and installed in the space heat demand.

  • Page 81: Specifications

    Installation & Service Manual Combi (continued) Basic operation Flow characteristics The factory installed option of the Cadet with domestic heating Domestic Flow Rate Domestic Temperature capability includes a separate water circuit for the boiler water (GPM) Rise (°F) to instantaneously and indirectly meet the demand of domestic hot water.
  • Page 82 Installation & Service Manual Combi Figure 14-2 Combi Low Voltage Field Wiring Connections Connection Board Configurations Standard Altitude,Standard Connected (Non-Combi) Standard Altitude, Combi High Altitude, Standard Connected Connected (Non-Combi) High Altitude, Combi Connected...

  • Page 83: Water Piping

    Installation & Service Manual Combi (continued) Water piping Field connections are to be made as represented in FIG. 14-3. A field-supplied anti-scald device MUST be installed as shown in FIG. 14-3. Anti-scald devices must be WARNING selected and installed in accordance to local codes. Failure to do so will result in scald or serious injury. The Combi is capable of supplying domestic water greater than 120°F which may scald.

  • Page 84: Combi

    DHW temperature range. Flow rates Consider the following factors when determining ideal DHW Verify that the Cadet will be able to maintain the established set point temperature: DHW set point temperature at an expected minimum flow – Cold water supply temperature rate.

  • Page 85: Diagrams

    Installation & Service Manual Diagrams Figure 15-1 Ladder Diagram (Standard) 120VAC NEUTRAL GROUND JUNCTION BOX 120V SUPPLY "L" 120V SUPPLY "N" INTEGRATED CONTROL BOILER BOILER PUMP "N" PUMP "L" BOILER PUMP X1-6 RELAY X1-2 BOILER PUMP X1-3 PUMP "N" PUMP "L" DHW PUMP RELAY X1-1...

  • Page 86: Wiring Diagram (Standard)

    Installation & Service Manual Diagrams Figure 15-2 Wiring Diagram (Standard) DISPLAY BOX DEPICTS OPTIONAL ITEMS INTEGRATED BOX DEPICTS CONTROL DUAL SENSOR SINGLE HOUSING LOW VOLTAGE CONNECTION BOARD 120 VAC HIGH VOLTAGE SYSTEM SENSOR OUTDOOR CAUTION HIGH VOLTAGE SPARK LEAD SENSOR SPARK ROD TANK SENSOR...

  • Page 87: Ladder Diagram (Combi)

    Installation & Service Manual Diagrams (continued) Figure 15-3 Ladder Diagram (Combi) 120VAC NEUTRAL GROUND JUNCTION BOX 120V SUPPLY "L" 120V SUPPLY "N" INTEGRATED CONTROL BOILER BOILER PUMP "N" PUMP "L" BOILER PUMP X1-2 X1-6 RELAY BOILER PUMP X1-3 DHW PUMP CHASSIS RELAY X1-1...

  • Page 88: Wiring Diagram (Combi)

    Installation & Service Manual Diagrams Figure 15-4 Wiring Diagram (Combi) DISPLAY BOX DEPICTS OPTIONAL ITEMS INTEGRATED BOX DEPICTS CONTROL DUAL SENSOR SINGLE HOUSING LOW VOLTAGE CONNECTION BOARD 120 VAC HIGH VOLTAGE SYSTEM SENSOR OUTDOOR CAUTION HIGH VOLTAGE SPARK LEAD SENSOR SPARK ROD DHW OUTLET SENSOR...
  • Page 89 Installation & Service Manual Notes...
  • Page 90 Installation & Service Manual Notes...
  • Page 91 Installation & Service Manual Notes...
  • Page 92 Revision A (ECO #C10659) initial release. Revision B (ECO #C11102) reflects outdoor air reset updates along with changes made to Table 3B on page 16 (ECR R05655). Revision C (ECO #C11314) reflects edits made to the Combi Section on page 81. Revision D (ECO #C11736) reflects changes made to the ratings page (page 6).

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