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Roberts Gorden CUHA Installation, Commissioning, Operation & Service Manual

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FOR YOUR SAFETY
If you smell gas:
1. Open windows.
2. DO NOT try to light any appliance.
3. DO NOT use electrical switches.
4. DO NOT use any telephone in
your building.
5. Leave the building.
6. Immediately call your local gas
supplier after leaving the building.
Follow the gas supplier’s
instructions.
7. If you cannot reach your gas
supplier, call the Fire Department.
WARNING
Fire Hazard
Do not store or use petrol or other
flammable vapours and liquids in the
vicinity of this or any other appliance.
Failure to follow these instructions can
result in death, injury or property
damage.
WARNING
Improper installation, adjustment, alteration, service
or maintenance can result in death, injury or property
damage. Read the installation, operation and service
manual thoroughly before installing or servicing
this equipment.
Installation must be done by a registered installer/
contractor qualified in the installation and service
of gas-fired heating equipment or your gas supplier.
Quality in Any Language™
© Copyright 2002 Roberts-Gordon
C mbat
Installation, Commissioning,
Operation & Service Manual
60 to 240 Manual Ignition
60 to 380 Automatic Ignition
Roberts-Gordon
Oxford Street
Bilston, West Midlands WV14 7EG UK
Telephone: +44(0) 1902 494425
Fax: +44(0) 1902 403200
Service Telephone: +44(0) 1902 498733
Service Fax: +44(0) 1902 401464
Export Sales Telephone: +44(0) 1794 521562
Export Sales Fax: +44(0) 1794 521387
E-mail: uksales@rg-inc.com
E-mail: export@rg-inc.com
www.combat.co.uk
Unit Heaters
Model CUH
(A, B, C, D)
Model CUH
(A/A, B/A, C/A, D/A)
Installer
Owner
www.rg-inc.com
X404E Rev A 07/02
®
®

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Summary of Contents for Roberts Gorden CUHA

  • Page 1 ® FOR YOUR SAFETY C mbat If you smell gas: ® 1. Open windows. 2. DO NOT try to light any appliance. 3. DO NOT use electrical switches. 4. DO NOT use any telephone in your building. 5. Leave the building. 6.

  • Page 3: Table Of Contents

    11.1 Pre Commission Checks..........38 4.3 General Technical Data Table (all models) ....8 11.2 Gas Supply ..............38 4.4 Technical Data Table - CUHA, CUHB, CUHC and 11.3 Mechanical Checks ..........38 CUHD Manual Ignition Range ........9 11.4 Automatic Ignition Unit Heaters .......39 4.5 Technical Data Table - CUHA/A, CUHB/A, CUHC/A...
  • Page 4 16.2 Main Burner Bars / Injectors........60 16.3 Pilot Burner Assembly (where fitted)....... 62 16.4 Gas Control Valves..........63 16.5 CUHA Axial Fan/Guard/Motor Assembly....63 16.6 CUHB & CUHC Centrifugal Fan/Guard/Motor Assembly..............64 16.7 Combination Fan/Limit Thermostat ......64 16.8 Second Limit Thermostat ........
  • Page 5 TABLE OF FIGURES Figure 1: Clearances to Combustibles........4 Figure 2: Flue Termination ............5 Figure 3: Offset Flues with 135° bends........5 Figure 4: Ducting ..............5 Figure 5: Combination Fan/Limit Thermostat......12 Figure 6: Honeywell Control ........... 12 Figure 7: Suspension Methods ..........

  • Page 7: Product Approval

    Product Approval...

  • Page 8: Section 1: Heater Safety

    COMBAT ® CUH U EATERS NSTALLATION PERATION AND ERVICE ANUAL SECTION 1: HEATER SAFETY Your Safety is Important to Us! 2.2 Corrosive Chemicals This symbol is used throughout the manual to notify you of possible fire, CAUTION electrical or burn hazards. Please pay special attention when reading and Do not use heater in an area containing corrosive following the warnings in these sections.

  • Page 9: Section 3: Critical Considerations

    Manual Ignition Automatic Ignition It is important that the gas supply pipe and the Axial CUHA 60 to 240 CUHA/A 60 to 380 electrical connections do not support any of the Centrifugal CUHB 60 to 240 CUHB/A 60 to 380 heater’s weight.

  • Page 10: Figure 1: Clearances To Combustibles

    Installation Clearances to Combustibles for all models: Model back of fan sides recommended burner removal combustibles above mounting height (m) CUHA 2.75 - 3.0 CUHB 2.75 - 3.75 CUHC See Figure 4 2.75 - 3.75 CUHD See Figure 4...

  • Page 11: Figure 2: Flue Termination

    SECTION 3: C RITICAL ONSIDERATIONS Figure 2: Flue Termination Figure 3: Offset Flues with 135° bends Figure 4: Ducting...

  • Page 12: Section 4: Specifications

    ANUAL SECTION 4: SPECIFICATIONS 4.1 All Models Front Views CUHD (and other models fitted with CUHA/B/C Models 60 - 300 CUHA/B/C Models 340 - 380 air outlet spigots) Models 60 - 380 Side Views CUHA Models 60 - 380 CUHB Models 60 - 380...

  • Page 13: Components Identification

    SECTION 4: S PECIFICATIONS 4.2 Components Identification REAR VIEW SIDE VIEW FRONT VIEW...

  • Page 14: General Technical Data Table (All Models)

    COMBAT ® CUH U EATERS NSTALLATION PERATION AND ERVICE ANUAL 4.3 General Technical Data Table (all models) MODEL REFERENCE ’A’ RANGE Total Electrical Load Watts Sifan PMG Sifan PMG Sifan PMG Sifan PMG Sifan PMG Sifan PMG Sifan PMG Sifan PMG Sifan PMG Sifan PMG Sifan PMG...

  • Page 15: Technical Data Table - Cuha, Cuhb, Cuhc And Cuhd Manual Ignition Range

    SECTION 4: S PECIFICATIONS 4.4 Technical Data Table - CUHA, CUHB, CUHC and CUHD Manual Ignition Range Appliance Category II 2H3+ Natural Gas Inlet Pressure 20 mbar (17 - 25) Propane Inlet Pressure 37 mbar (25-45) Butane Inlet Pressure 29 mbar (20-35)

  • Page 16: Technical Data Table - Cuha/A, Cuhb/A, Cuhc/A And Cuhd/A Automatic Ignition Range

    EATERS NSTALLATION PERATION AND ERVICE ANUAL 4.5 Technical Data Table - CUHA/A, CUHB/A, CUHC/A and CUHD/A Automatic Ignition Range Appliance Category II 2H3+ Natural Gas Inlet Pressure 20 mbar (17 - 25) Propane Inlet Pressure 37 mbar (25-45) Butane Inlet Pressure 29 mbar (20-35)

  • Page 17: Gas Controls - Automatic Ignition

    4.11.1 Description of Burner Control Box One is within the combination thermostat and the The fully automatic gas burner fitted to all CUHA/A, second is on the side of the heater towards the rear CUHB/A, CUHC/A and CUHD/A models is of the heater.

  • Page 18: Figure 6: Honeywell Control

    COMBAT ® CUH U EATERS NSTALLATION PERATION AND ERVICE ANUAL Figure 5: Combination Fan/Limit Thermostat WARNING Fire Hazard Break-off link must be removed from replacement thermostat. Failure to follow these instructions can result in death, injury, property damage or product damage. Dial Limit Hand Fan On Hand...

  • Page 19: Section 5: Heater Installation

    SECTION 5: H EATER NSTALLATION SECTION 5: HEATER INSTALLATION 5.3 Shelf Mounting and Suspension 5.1 General WARNING Heaters are designed for installation where by the bottom panel of the heater is between 2.75m and Suspension Hazard 3.75m above the floor. Support heater at all four corners on the lower edge of the side panels.

  • Page 20: Section 6: Flue Installation

    COMBAT ® CUH U EATERS NSTALLATION PERATION AND ERVICE ANUAL SECTION 6: FLUE INSTALLATION 6.1 Flue Installation Flues must be correctly sized for the model. See WARNING Page 6, Section 4.1. Flues should be assembled as on Page 5, Figure 2, on Page 5, Figure 3 and Page 14, Figure 8 through Page 15, Figure 11.

  • Page 21: Figure 10: Flue And Roof Detail

    SECTION 6: F NSTALLATION Figure 10: Flue and Roof Detail Figure 11: Flue and Heater Spigot Joint Detail...

  • Page 22: Models 340 And 380 Only

    COMBAT ® CUH U EATERS NSTALLATION PERATION AND ERVICE ANUAL 6.2 Models 340 and 380 only The models 340 and 380 heaters are provided with two outlet spigots on top of the heater and a flue assembly to combine these two flue outlets into a single vertical flue.

  • Page 23: Section 7: Air Supply

    SECTION 7: A UPPLY SECTION 7: AIR SUPPLY 7.1 Air Supply It is important to ensure that there is adequate air supply at all times for both combustion and heating requirements. 7.1.1 Isolated Equipment Rooms Ventilation must prevent the isolated equipment room temperature from exceeding 32°C as well as prevent any negative air pressure within the room.

  • Page 24: Section 8: Optional Heater Configurations

    COMBAT ® CUH U EATERS NSTALLATION PERATION AND ERVICE ANUAL SECTION 8: OPTIONAL HEATER CONFIGURATIONS 8.1 Distribution Ductwork for CUHB, CUHC and 8.1.1 CUHD Heaters CUHD Heaters For CUHD heaters it is essential that the airflow in CUHC range heaters have the fans enclosed so that the duct system is at least that specified in the Data the heater may be connected to inlet ducting.

  • Page 25: Figure 12: Heaters Installed In Isolated Equipment Rooms

    SECTION 8: O PTIONAL EATER ONFIGURATIONS Figure 12: Heaters installed in isolated equipment rooms. AIRFLOW AIRFLOW Figure 13: CUH C or D Heaters with Inlet/Outlet Duct Spigots and Flange.

  • Page 26: Section 9: Gas Piping

    COMBAT ® CUH U EATERS NSTALLATION PERATION AND ERVICE ANUAL SECTION 9: GAS PIPING WARNING Connect the heater to the gas supply ensuring that the final connections are as follows: • Gas supply pipe work is run in medium or heavy gauge tubing to National Standards terminating as shown on Page 20, Figure 14.

  • Page 27: Section 10: Wiring And Electrical Information

    A switch or control wired between terminals L & 1 in the terminal block at the side of the heater will allow external control of the fan(s). CUHA, CUHA/A all models 5 Amp. The fan may be controlled to operate continuously...

  • Page 28: Cuh Individual Controls (All Models)

    COMBAT ® CUH U EATERS NSTALLATION PERATION AND ERVICE ANUAL 10.3 CUH Individual Controls (all models) Minimum Control 230v 50Hz 230v 50Hz Normal Control Supply Supply Heater Terminals Heater Terminals Time Switch 230v 50Hz 230v Room Thermostat Frost Thermostat Room Thermostat Optional Fan Controls For CUHB, CUHC or Heater Terminals...

  • Page 29: Cuha Wiring Diagram

    Motor RDW 1518 brown NOTE: Second fan on models CUHA 200 & 240. The second fan terminals and capacitor may be in a separate terminal box. 10.6 CUHB & CUHC Wiring Diagram (60-160) MANUAL IGNITION RDW 1652...

  • Page 30: Cuhb & Cuhc Wiring Diagram (180-240)

    COMBAT ® CUH U EATERS NSTALLATION PERATION AND ERVICE ANUAL 10.7 CUHB & CUHC Wiring Diagram (180-240) MANUAL IGNITION 230v 50Hz 230v room Supply thermostat green/yellow white Neutral Medium blue yellow black High green/yellow white Neutral Medium blue black High...

  • Page 31: Cuhd Wiring Diagram (All Models)

    SECTION 10: W IRING AND LECTRICAL NFORMATION 10.8 CUHD Wiring Diagram (all models) MANUAL IGNITION MAIN TERMINALS orange Combination fan/limit thermostat Secondary limit thermostat red/white 230v 50Hz supply Limit white orange/white Rear combination motor fan/limit thermostat Max load 7Amps Limit Flame brown probe...

  • Page 32: Cuha/A Wiring Diagram (60-240) Satronic

    COMBAT ® CUH U EATERS NSTALLATION PERATION AND ERVICE ANUAL 10.9 CUHA/A Wiring Diagram (60-240) Satronic AUTOMATIC IGNITION black blue brown black blue brown...

  • Page 33: Cuha/A Wiring Diagram (280-300) Satronic

    SECTION 10: W IRING AND LECTRICAL NFORMATION 10.10 CUHA/A Wiring Diagram (280-300) Satronic AUTOMATIC IGNITION Satronic DKG 972 Mod 03 control box RDW 1801 Remote reset MAIN TERMINALS heat ON (green) Lockout reset blue black Lockout Lockout (red) blue grey...

  • Page 34: Cuhb/A & Cuhc/A Wiring Diagram (60-160) Satronic

    COMBAT ® CUH U EATERS NSTALLATION PERATION AND ERVICE ANUAL 10.12 CUHB/A & CUHC/A Wiring Diagram (60-160) Satronic AUTOMATIC IGNITION green/yellow white Neutral blue Medium blue black High violet...

  • Page 35: Cuhb/A & Cuhc/A Wiring Diagram (180-300) Satronic

    SECTION 10: W IRING AND LECTRICAL NFORMATION 10.13 CUHB/A & CUHC/A Wiring Diagram (180-300) Satronic AUTOMATIC IGNITION green/yellow white Neutral blue Medium blue yellow black High green/yellow violet Neutral white Medium blue High black...

  • Page 36: Cuhb/A & Cuhc/A Wiring Diagram (340-380) Satronic

    COMBAT ® CUH U EATERS NSTALLATION PERATION AND ERVICE ANUAL 10.14 CUHB/A & CUHC/A Wiring Diagram (340-380) Satronic AUTOMATIC IGNITION green/yellow white Neutral blue Medium blue yellow black High green/yellow violet Neutral white Medium blue High black green/yellow Neutral white Medium blue High...

  • Page 37: Cuhd/A Wiring Diagram (60-300) Satronic

    SECTION 10: W IRING AND LECTRICAL NFORMATION 10.15 CUHD/A Wiring Diagram (60-300) Satronic AUTOMATIC IGNITION MAIN TERMINALS Satronic DKG 972 Mod 03 heat ON control box (green) Lockout reset blue black Lockout Lockout (red) blue grey Schaffner blue FN/660/3/06 mains filter white/brown brown blue...

  • Page 38: Cuha/A Wiring Diagram (60-240) Honeywell

    COMBAT ® CUH U EATERS NSTALLATION PERATION AND ERVICE ANUAL 10.17 CUHA/A Wiring Diagram (60-240) Honeywell AUTOMATIC IGNITION...

  • Page 39: Cuha/A Wiring Diagrams (280-300) Honeywell

    SECTION 10: W IRING AND LECTRICAL NFORMATION 10.18 CUHA/A Wiring Diagrams (280-300) Honeywell AUTOMATIC IGNITION 10.19 CUHA/A Wiring Diagram (340-380) Honeywell AUTOMATIC IGNITION...

  • Page 40: Cuhb/A & Cuhc/A Wiring Diagram (60-160) Honeywell

    COMBAT ® CUH U EATERS NSTALLATION PERATION AND ERVICE ANUAL 10.20 CUHB/A & CUHC/A Wiring Diagram (60-160) Honeywell AUTOMATIC IGNITION...

  • Page 41: Cuhb/A & Cuhc/A Wiring Diagram (180-300) Honeywell

    SECTION 10: W IRING AND LECTRICAL NFORMATION 10.21 CUHB/A & CUHC/A Wiring Diagram (180-300) Honeywell AUTOMATIC IGNITION white Neutral Medium blue ellow black High green/yellow white Medium blue High black...

  • Page 42: Cuhb/A & Cuhc/A Wiring Diagram (340-380) Honeywell

    COMBAT ® CUH U EATERS NSTALLATION PERATION AND ERVICE ANUAL 10.22 CUHB/A & CUHC/A Wiring Diagram (340-380) Honeywell AUTOMATIC IGNITION...

  • Page 43: Cuhd/A Wiring Diagram (60-300) Honeywell

    SECTION 10: W IRING AND LECTRICAL NFORMATION 10.23 CUHD/A Wiring Diagram (60-300) Honeywell AUTOMATIC IGNITION 10.24 CUHD/A Wiring Diagram (340-380) Honeywell AUTOMATIC IGNITION...

  • Page 44: Section 11: Commissioning The Heater

    COMBAT ® CUH U EATERS NSTALLATION PERATION AND ERVICE ANUAL SECTION 11: COMMISSIONING THE HEATER Installation, service and annual inspection of heater WARNING must be done by a contractor qualified in the installation and service of gas-fired heating equipment. Read this manual carefully before installation, commissioning, operation, or service of this equipment.

  • Page 45: Automatic Ignition Unit Heaters

    SECTION 11: C OMMISSIONING EATER 2. Check that the flue is installed in accordance 2. Wait one minute, then press in the control box with these instructions and local regulations. reset button, or the remote reset button if fitted, and repeat until the pilot flame ignites. 3.

  • Page 46: Figure 16: S.i.t. Tandem 0.830.033 Gas Valve (Natural Gas) 0.830.020 Valve (L.p.g

    COMBAT ® CUH U EATERS NSTALLATION PERATION AND ERVICE ANUAL Figure 16: S.I.T. Tandem 0.830.033 Gas Valve (Natural gas) 0.830.020 Valve (L.P.G) Regulator adjusting screw under cover. (NOTE: On L.P.G. heaters the Regulator Adjusting Screw must be turned fully clockwise.) Burner Pressure Test Point Step Opening...

  • Page 47: Figure 18: S.i.t. Nova 0.820.054 Manual Ignition Gas Valve

    Figure 19: Main Gas Valves for Models 340 and 380 The main gas control valve used on all versions of the models CUHA/A, CUHB/A, CUHC/ A and CUHD/A 340 and 380 is the Honeywell VR 420AB 1002 combination gas valve.

  • Page 48: Manual Ignition Unit Heaters

    COMBAT ® CUH U EATERS NSTALLATION PERATION AND ERVICE ANUAL 11.4.2 Commissioning the Gas Valves 11.4.3 Commissioning the Gas Valves Natural Gas Liquid Petroleum Gas (L.P.G.) 11.4.2.1 Check Burner Gas Pressure 1. In all cases the gas valves for L.P.G either have no regulator or have the regulator set to maxi- 1.

  • Page 49: Commissioning Tests - (All Models) Spillage Test

    SECTION 11: C OMMISSIONING EATER To Operate the Main Burner switch (if fitted) and room thermostat to the users’ Replace the electrical plug onto the gas valve. Press requirements. in slightly and turn the valve control knob a quarter turn counter-clockwise to the "flame" symbol. With 11.11 Complete the Installation the external controls in an on position and calling for Ensure that all covers are fitted correctly and all test...

  • Page 50: Section 12: User Instructions

    12.3 Common User Controls (all models) Manual Ignition 12.3.1 Combination Fan/Limit Thermostat The CUHA, CUHB, CUHC & CUHD ranges of heaters are manual ignition of the pilot, but operate The Combination Fan/Limit Thermostat is located automatically from the remote controls fitted on site.

  • Page 51: Automatic Ignition User Controls

    Follow the instructionson Page 45, Section 12.7 to light the pilot and operate the main burner. 12.7 Manual Ignition Lighting Instructions For types CUHA, CUHB,CUHC and CUHD only. Explosion Hazard (See Page 45, Section 12.5 for lighting automatic If control locks out, do not make more than 3 attempts to restart the heater.

  • Page 52: Simple Fault Finding (All Models)

    COMBAT ® CUH U EATERS NSTALLATION PERATION AND ERVICE ANUAL 3. Once the pilot flame has been lit (visible 12.8 Simple Fault Finding (all models) through the rear panel near the gas pipe to the Some possible reasons for the heater not operating are: burner) continue to hold in the control valve 1.

  • Page 53: Service Requirements

    SECTION 12: U NSTRUCTIONS 12.8.2 Simple Fault Finding - FOR YOUR SAFETY Manual Ignition Heaters If you smell gas: 1. Ensure that the pilot flame is lit. See Page 45, 1. Open windows. 2. DO NOT try to light any appliance. Section 12.7.

  • Page 54: Section 13: Servicing

    COMBAT ® CUH U EATERS NSTALLATION PERATION AND ERVICE ANUAL SECTION 13: SERVICING 13.1 Servicing Instructions 3. Check that the pilot gas pipe (where fitted) is clear of any deposits and that there are no After commissioning, the heater will require maintenance to be carried out annually.

  • Page 55: Gas Control Valve Maintenance (All Models)

    SECTION 13: S ERVICING 13.4 Gas Control Valve Maintenance (all models) No regular maintenance is required on these devices. To change gas control valves, See Page 60, Step 16.1.2 and Page 63, Section 16.4. Do not repair or disassemble on site. Replace faulty gas valves with genuine ®...

  • Page 56: Section 14: Conversion Between Gases

    COMBAT ® CUH U EATERS NSTALLATION PERATION AND ERVICE ANUAL SECTION 14: CONVERSION BETWEEN GASES 14.1 General 10, Section 4.5, Technical Data Tables for part numbers and specification numbers. NOTE: All CUH 60 models can only be operated on Natural Gas. Do not operate these models on L.P.G. All versions of the heaters use the same main 14.3.1 Tandem Range Valves burner bars and pilot burners.

  • Page 57: Figure 24: Conversion Of Nova Family Valve

    SECTION 14: C ONVERSION ETWEEN ASES Figure 24: Conversion of Nova Family Valve The valve shown is the Nova manual ignition version, Dustcap conversion of the automatic ignition Exclusion screw version is exactly the same. for L.P.G. Governor spring assembly for natural gas.

  • Page 58: Conversion Of Manual Ignition Valves

    COMBAT ® CUH U EATERS NSTALLATION PERATION AND ERVICE ANUAL 14.4 Conversion of Manual Ignition Valves All CUH range manual ignition unit heaters use an S.I.T Nova multifunctional gas valve. Nova Range Valves Nova range main valves may be converted to operate with or without a burner gas pressure regulator.

  • Page 59: Section 15: Troubleshooting

    SECTION 15: T ROUBLESHOOTING SECTION 15: TROUBLESHOOTING 15.1 General for Automatic Ignition WARNING Explosion Hazard Service and repair must be performed by registered installers or registered service engineers. Failure to follow these instructions can result in death, injury or property damage. Start TROUBLESHOOT ENDS.
  • Page 60 COMBAT ® CUH U EATERS NSTALLATION PERATION AND ERVICE ANUAL 15.1.1 General - Manual Ignition WARNING Explosion Hazard Service and repair must be performed by registered installers or registered service engineers. Failure to follow these instructions can result in death, injury or property damage. Start TROUBLESHOOT ENDS.

  • Page 61: Troubleshooting For Automatic Ignition Burner Systems

    SECTION 15: T ROUBLESHOOTING 15.2 Troubleshooting For Automatic Ignition Burner Systems There are two possible burner controls used. Satronic WARNING DKG972 or Honeywell S4563. They both have similar operating sequences. Honewell has a built in ignition device. To measure flame current, connect a 0 - 50 µA DC meter in series with the flame probe by using the flame probe jack plug or connection at control box for Honeywell control.

  • Page 62: Figure 26: Automatic Burner Control Box Sequence

    COMBAT ® CUH U EATERS NSTALLATION PERATION AND ERVICE ANUAL 15.2.1 Satronic DKG 972 Control Information 15.2.3 Fault Display Messages System On burner failure the red LED is illuminated for a The Satronic DKG 972 control is a micro-processor period of approximately 10 seconds, followed by a control which provides information about the current brief “dark phase”, then one of the following flash operation of the burner and the cause of any faults.

  • Page 63: Flame Supervision System

    SECTION 15: T ROUBLESHOOTING 15.3 Flame Supervision System 15.3.1 Automatic Ignition Systems START To measure flame current, connect a 0 - 50 µA DC meter in series with the flame probe by using the flame probe jack plug. If the meter reads negative values, then reverse the test leads.

  • Page 64: Troubleshooting For Solenoid Valves

    COMBAT ® CUH U EATERS NSTALLATION PERATION AND ERVICE ANUAL 15.4 Troubleshooting for Solenoid Valves NOTE: For manual ignition valves, the gas will not pass to the main burner until the pilot flame has been lit and accepted and the valve knob has been turned to main flame position.

  • Page 65: Troubleshooting For Fan Contactor

    SECTION 15: T ROUBLESHOOTING 15.6 Troubleshooting for Fan Contactor START TROUBLESHOOT ENDS. For your safety and optimum heater performance use only ROBERTS GORDON ® replacement parts. Conduct Commissioning procedure as on Page 38, Section 11...

  • Page 66: Section 16: Removal And Replacement Parts

    COMBAT ® CUH U EATERS NSTALLATION PERATION AND ERVICE ANUAL SECTION 16: REMOVAL AND REPLACEMENT PARTS See warnings and notes on Page 48, Section 13 before removing or replacing parts. 16.1 Burner Tray 16.1.1 Lower panels The burner tray may be removed complete with the gas valve train assembly or without.
  • Page 67 SECTION 16: R EMOVAL AND EPLACEMENT ARTS 16.2.2 Individual Bar and Injector Removal 16 mm 3 mm Description Part Number Main Burner Injector - Natural Gas B094 Main Burner Injector - LPG B095 Sealing Washer B210 16.2.3 Direct Main Flame Ignition for Automatic Ignition Up To Model 300. 3 mm...

  • Page 68: Pilot Burner Assembly (Where Fitted)

    COMBAT ® CUH U EATERS NSTALLATION PERATION AND ERVICE ANUAL 16.3 Pilot Burner Assembly (where fitted). Step 16.3.2 Pilot Bracket Assembly CAUTION: Do not kink or tightly bend the pilot gas pipe or thermocouple. Natural gas and L.P.G. operate utilizing different pilot injectors.

  • Page 69: Gas Control Valves

    16.5 CUHA Axial Fan/Guard/Motor Assembly the inlet pipe fittings and the outlet is a 4 mm OD The Axial fan unit for the CUHA range of heaters is compression fitting. Electrical connection is by a supplied completely assembled and balanced.

  • Page 70: Cuhb & Cuhc Centrifugal Fan/Guard/Motor Assembly

    COMBAT ® CUH U EATERS NSTALLATION PERATION AND ERVICE ANUAL 16.6 CUHB & CUHC Centrifugal Fan/Guard/Motor • Check that the fan blades are free to rotate Assembly without catching before turning on the power to The direct drive fan/s for the CUHB & CUHC range the fan.
  • Page 71 SECTION 16: R EMOVAL AND EPLACEMENT ARTS 4. Remove the fan assembly from the heater rear. See Page 63, Section 16.5.1 or See Page 64, Section 16.6 5. Carefully pull the capillary sensing probe through its access hole in the side of the heater heat exchanger being careful not to damage the capillary tube.

  • Page 72: Major Components Descriptions

    ERVICE ANUAL 16.9 Major Components Descriptions S.I.T. Tandem (Natural Gas) 0.830.033 P/N L411 Axial Fan 35041-101 P/N A262A Automatic Ignition Gas Valve CUHA 60/100/200/240 Axial Fan 39041-101 P/N A263A CUHA 120/140 Axial Fan 42041-101 P/N A264A CUHA 160/180/280/300/340/380 S.I.T. Tandem (L.P.G. Gas) 0.830.020...
  • Page 73 SECTION 16: R EMOVAL AND EPLACEMENT ARTS Major Components Descriptions Spark Electrode P/N J021 (all models with pilot burner) S.I.T. Nova Exclusion Screw for L.P.G. 0.907.037 P/N L425 Automatic Ignition Flame Probe P/N J035 Pilot Burner Injector - Marked 34. P/N B184 (Natural Gas) Pilot Burner Injector - Marked 19.

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