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. Extinguish any open flame. 6. Leave the building. 7. Immediately call your local gas supplier after leaving the building. Follow the gas supplier’s instructions. 8. If you cannot reach your gas supplier, call the Fire Department.
POUR VOTRE SECURITE Si vous sentez une odeur de gaz: Combat 1. Ouvrez les fenêtres. 2. N’essayez PAS d’allumer un appareil. 3. N’utilisez PAS d’interrupteurs électriques. 4. N’utilisez PAS de téléphone dans votre bâtiment. 5. Eteignez toute flamme nue. 6. Quittez le bâtiment. 7. Après avoir quitté le bâtiment, appelez immédiatement votre fournisseur local de gaz. Suivez les instructions du fournisseur de gaz. 8. Si vous ne pouvez pas joindre votre fournisseur de gaz, appelez le service d’incendie.
TABLE OF CONTENTS SECTION 1: Heater Safety...................................................... 1 1.1 Manpower Requirements ............................................. 1 1.2 Safety Labels and Their Placement ............................. 1 1.3 California Proposition 65 .............................................. 1 SECTION 2: Installer Responsibility ..................................... 4 2.1 Wall Tag ....................................................................... 4 2.2 Corrosive Chemicals....
TABLE OF FIGURES Figure 1: UHD [X][S] 75 Label Placement ................................ 2 Figure 2: UHD [X][S] 100-125 Label Placement........................ 3 Figure 3: Clearances to Combustibles ...................................... 6 Figure 4: Air Flow Direction ....................................................... 9 Figure 5: Suspension Methods ............................................... 10 Figure 6: Shelf-Mounting Methods ..........................................
SECTION 1: HEATER SAFETY SECTION 1: HEATER SAFETY Your Safety is Important to Us! This symbol is used throughout the manual to notify you of possible fire, electrical or burn hazards. Please pay special attention when reading and following the warnings in these sections. Installation, service and, at a minimum, annual inspection of heater must be done by a contractor qualified in the installation and service of gas-fired heating equipment.
UHD LOW PROFILE DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL Figure 1: UHD[X][S] 75 Label Placement Description Logo Label Cut Hazard Label Vent Length Label Vent to Outdoors Label Warning Label Rating Plate Label Installation Label Instruction Location Label Lighting Instruction Label Venting Arrangement Label* Manual Reset Switch Label Proposition 65 Label Part Number 91040030 91010430 91039505 91010427 91010429 91039802 91010431 91010433 91010425 91010426 91010428 91070015 * For separated c
SECTION 1: HEATER SAFETY Figure 2: UHD[X][S] 100-125 Label Placement BACK VIEW FRONT VIEW WARNING WARNING Cut Hazard Cut Hazard Turn off electrical supply before maintenance. Fan can start automatically. Failure to follow these instructions can result in serious injury or property damage. VENT TO OUTDOORS DONNER VENT A DEHORS Turn off electrical supply before maintenance. Fan can start automatically. Failure to follow these instructions can result in serious injury or property damage. Printed in U.
UHD LOW PROFILE DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL SECTION 2: INSTALLER RESPONSIBILITY The installer is responsible for the following: • To install the heater, as well as the gas and electrical supplies, in accordance with applicable specifications and codes. Roberts-Gordon LLC recommends the installer contact a Local Building Inspector or Fire Marshal for guidance.
SECTION 3: CRITICAL CONSIDERATIONS SECTION 3: CRITICAL CONSIDERATIONS 3.1 Basic Information UHD[X][S] heaters have automatic ignition burners for ON/OFF operation only. 3.2 Manufactured Units Gas-fired, power-vented duct furnace with tubular heat exchanger. Units shall have a minimum of 82% thermal efficiency. The standard unit shall consist of a non-separated combustion design with an aluminized heat exchanger.
UHD LOW PROFILE DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL SECTION 4: CLEARANCES TO COMBUSTIBLES 4.1 Required Clearances to Combustibles WARNING 4.2 Clearances to Combustibles Clearances must be as indicated on Page 6, Figure 3. If clearances to combustibles are not indicated, then installation clearances apply. Figure 3: Clearances to Combustibles Fire Hazard Keep all flammable objects, liquids and vapors the minimum required clearances to combustibles away from heater.
SECTION 5: NATIONAL STANDARDS AND APPLICABLE CODES SECTION 5: NATIONAL STANDARDS AND APPLICABLE CODES 5.1 Gas Codes The type of gas appearing on the name plate must be the type of gas used. Installation must comply with national and local codes and requirements of the local gas company. United States: Refer to NFPA 54/ ANSI Z223.1 latest revision, National Fuel Gas Code. Canada: Refer to CSA B149.1 Natural Gas and Propane Installation Code. 5.
UHD LOW PROFILE DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL 5.6 High Altitude These heaters are approved (without modifications) for installations up to 2000' (610 m) in US and Canada. Heaters installed above 2000' (610 m) must be de-rated. For installations above 2000' (610 m) in US, consult factory for information on burner de-rating. For installations from 2000' (610 m) to 4500' (1370m) in Canada, high altitude conversion kits are available.
SECTION 6: DUCT HEATER INSTALLATION SECTION 6: DUCT HEATER INSTALLATION 6.1 General To connect the inlet and outlet ducts to the heater, Duct-Mate or similar flanges may be slid over the duct connector flanges supplied on the unit and secured with screws. The connection to the duct then can be made using the Duct-Mate clips. The ducts must have removable access panels upstream and downstream of the heater.
UHD LOW PROFILE DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL 6.2 Shelf Mounting and Suspension WARNING Do not locate the gas or electrical supply lines directly over the path of the flue products from the heater. Crush Hazard Use 3/8" threaded rod minimum. Failure to follow these instructions can result in death, injury or property damage. Four suspension points (3/8" nuts) are located on the top of the heater. Drop rods must be 3/8" diameter mild steel minimum.
SECTION 6: DUCT HEATER INSTALLATION Figure 6: Shelf-Mounting Methods Existing cabinet screws must be re-used. Description Part Number Shelf Mounting Bracket Kit 12011000K Shelf Mounting Bracket 11111510 Screw #10 x 1/2" 94311008 Type AB Phil HWH Z Shelf Mounting Brackets Qty.
UHD LOW PROFILE DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL SECTION 7: VENTING WARNING Carbon Monoxide Hazard Heaters may be installed vented or unvented. Vented heaters must be vented outdoors. Unvented heaters must be installed according to the installation manual. Failure to follow these instructions can result in death or injury. 7.1 Changing Vent and Air Intake Orientation The heater is sold with rear horizontal vent and air intake connections as standard.
SECTION 7: VENTING Vents and air intakes must be adequately supported so that the heater does not bear the weight of the pipes. For vent termination See Page 14, Figure 8 through Page 18, Figure 13. 7.3.1 Standard Vented Heaters (Models UHD[X] 75 - 125) The vent must be fitted with a low resistance terminal. See Page 14, Figure 8 through Page 16, Figure 10. Standard vented heaters do not allow outdoor air intake for combustion air. 7.3.
UHD LOW PROFILE DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL 7.7.1 Maximum Vent Lengths Model UHD[X][S] 75, 100, 125 40 ft (12.2 m) 35 ft (10.7 m) 30 ft (9.1 m) 25 ft (7.6 m) 20 ft (6.1 m) Number of Elbows 1 2 3 4 5 7.8 Vent Material Vent material may be single wall 26 ga. (minimum) galvanized steel or equal thickness stainless steel. Completely seal all joints, refer to Page 12, Section 7.3. If penetrating a combustible wall or roof, a listed thimble with 2" (5 cm) clearance must be used.
SECTION 7: VENTING Figure 9: Standard Vented Heater - Vertical and Horizontal Vent Termination Model UHD[X] 75 - 125 Vent Diameter 4" (10 cm) Part Number 90502102 15 of 47
UHD LOW PROFILE DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL Figure 10: Standard Vented Heater - Common Vertical Vent Termination Requirements: • Maximum of four heaters can be commonly vented through the roof. • Heaters must be of the same BTU output. • Heaters must be controlled by a common thermostat. • Connections to a common stack must be positioned to avoid direct opposition between streams of combustion gases.
SECTION 7: VENTING Figure 11: Separated Combustion Heater - Vertical and Horizontal Vent Termination Model UHD[X]S 75 - 125 Air Intake & Vent Diameter 4" (10 cm) Part Number 90502102 Figure 12: Concentric Vent Box ace t airsp s) ) m c er /4" (6 y oth ter, 1 alent. (B e m ) dia or equiv 0 cm 4" (1 odel RV f o irk M piece One vent. Selk “B” ype Toward Outside Seal joint between single wall and Type B vent with silicone sealant.
UHD LOW PROFILE DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL Figure 13: Concentric Vertical and Horizontal Vent Termination - Separated Combustion Heater Description Concentric Vent Kit Concentric Vent Box Top & Side Assembly Concentric Vent Box Bottom Assembly Screw #6 x 3/8 Self Drilling 4" (10 cm) Vent Terminal with Baffle Plate 6" (15 cm) Combustion Air Terminal 18 of 47 Part Number UHVK1 90504113 90504112 91119100 90502102R 90502103 Qty.
SECTION 8: AIR SUPPLY SECTION 8: AIR SUPPLY WARNING Explosion Hazard Equipment must have access to uncontaminated air at all times. Failure to follow these instructions can result in death, injury or property damage. 8.1 Separated Combustion Installation When installed as a separated combustion heater (UHD[X]S), the air for combustion is drawn in from outside the building. 8.
UHD LOW PROFILE DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL SECTION 9: GAS PIPING Fire Hazard Connect gas supply according to Figure 14. Do not use gas supply pipe and electrical connections to support the heater’s weight. Gas can leak if not installed properly. Failure to follow these instructions can result in death, injury or property damage. WARNING Explosion Hazard Leak test all components of gas piping before operation. Gas can leak if piping is not installed properly.
SECTION 9: GAS PIPING Figure 14: Gas Connection • Hold gas nipple securely with pipe wrench when attaching the flexible gas connector. • Do not twist flexible gas connector. CAUTION Product Damage Hazard Hold gas nipple securely with pip wrench when attaching flexible gass connector. Failure to follow these instruction can relsut in prdouct damage • Ensure all joints are gas tight. • Do not bend flexible gas connector sharply.
UHD LOW PROFILE DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL SECTION 10: WIRING DANGER Electrical Shock Hazard Disconnect electric before service. More than one disconnect switch may be required to disconnect electric from equipment. Equipment must be properly grounded. Failure to follow these instructions can result in death or electrical shock. All heater models require constant 120 V/1Ø/ 60 Hz power supply. Check heater rating plate for electrical rating for proper circuit sizing.
SECTION 10: WIRING 10.
UHD LOW PROFILE DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL 10.
SECTION 10: WIRING 10.5 Electrical Connection to the Heater Flexible Conduit BX Connector Burner Connect wires together with suitable approved wire connectors. L1 L2 Ground Green to Ground White to L2 Black to L1 Black White Green Junction Box IMPORTANT: Junction box is not provided with heater. Conduit can also be attached directly to heater with wire junction made within the heater cabinet.
UHD LOW PROFILE DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL SECTION 11: OPERATION AND MAINTENANCE WARNING DANGER Electrical Shock Hazard Disconnect electric before service. Explosion Hazard Turn off gas supply to heater before service. Heater must be connected to a properly grounded electrical source. Burn Hazard Allow heater to cool before service. Cut/Pinch Hazard Wear protective gear during installation, operation and service. Tubing may still be hot Edges are sharp. after operation.
SECTION 11: OPERATION AND MAINTENANCE Figure 15: Automatic Burner Control Sequence Burner Sequence for Ignition Control START RUN SHUT DOWN Thermostat 24 V Flue Blower 30 Seconds Purge* Pressure Switch P C 30 Seconds Post NO NC ts = 10 Seconds Ignition Spark Start Gas Valve Flame Signal *Purge time begins at pressure switch change over. Required Incoming Signals Signals Output By Control If at any stage the flame fails, the control will retry for ignition.
UHD LOW PROFILE DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL 11.2.2 Start-Up the Gas Valve (All Gases) 11.2.2.1 Check Burner Gas Pressure 1. Remove the plug in the outlet (burner) pressure test point and connect a pressure tap and a manometer. 2. With the burner firing, measure the pressure on the manometer.
SECTION 12: USER INSTRUCTIONS SECTION 12: USER INSTRUCTIONS WARNING DANGER Electrical Shock Hazard Disconnect electric before service. Explosion Hazard Turn off gas supply to heater before service. Heater must be connected to a properly grounded electrical source. Burn Hazard Allow heater to cool before service. Cut/Pinch Hazard Wear protective gear during installation, operation and service. Tubing may still be hot Edges are sharp. after operation.
UHD LOW PROFILE DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL Figure 17: Manual Reset Limit Switch Reset Button To reset manual reset limit switch, press reset button. NOTE: To reset, the switch must be cool. Description Manual Reset Limit Switch Part Number 90412106 12.4.1 Simple Troubleshooting (Burner Faults) If the burner fails to ignite for any reason, it will retry for ignition (four trials total).
SECTION 13: SERVICING SECTION 13: SERVICING WARNING DANGER Electrical Shock Hazard Disconnect electric before service. Explosion Hazard Turn off gas supply to heater before service. Heater must be connected to a properly grounded electrical source. Burn Hazard Allow heater to cool before service. Cut/Pinch Hazard Wear protective gear during installation, operation and service. Tubing may still be hot Edges are sharp. after operation.
UHD LOW PROFILE DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL 13.
SECTION 13: SERVICING Combustion Air Intake Pipe Intake pipe and inlet must be intact. Look for obstructions, cracks on the pipe, gaps in the sealed areas or corrosion. The area must be free of dirt and dust. Clean and reinstall as required. See Page 19, Section 8 Heat Exchanger Make sure there are no cracks. Make sure there is no sagging, bending or distortion. Clean or replace as required. Gas Line and Shut-off Valves Check for gas leaks.
UHD LOW PROFILE DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL SECTION 14: TROUBLESHOOTING WARNING DANGER Electrical Shock Hazard Disconnect electric before service. Heater must be connected to a properly grounded electrical source. Explosion Hazard Turn off gas supply to heater before service. Burn Hazard Allow heater to cool before service. Cut/Pinch Hazard Wear protective gear during installation, operation and service. Tubing may still be hot Edges are sharp. after operation.
SECTION 14: TROUBLESHOOTING 14.1 General START Are gas & electrical supplies on? No Yes Is ignition control showing a Yes "4 flashes" LED code? Turn on supplies. UHD 75: Press in reset button on manual reset limit switch. UHD 100 - 125: Wait 10 - 15 minutes for limit Yes switch to cool. Does fan stop running? Fan and limit switch are operating normally. No Replace temperature limit switch. No Is ignition control showing a Yes "2 flashes" LED code? Burner has locked out due to ignition failure.
UHD LOW PROFILE DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL 14.2 Troubleshooting For Automatic Ignition Burner Systems START Are gas & electrical supplies on? No Turn on supplies. No Turn on controls. Yes Are external controls (i.e. Thermostat) on? UHD 75: Press in reset button on manual reset limit switch. UHD 100 - 125: Wait Yes 10 - 15 minutes for limit switch to cool.
SECTION 14: TROUBLESHOOTING 14.3 Troubleshooting for Flame Supervision System To measure flame current, connect a 0 - 50 μA DC meter in series with the flame probe. If the meter reads negative values, then reverse the test leads. START Connect a DC ammeter in series with the flame probe. Is the flame present and at least 1 μA DC flame current? No Use General Troubleshooting section to trace the fault.
UHD LOW PROFILE DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL 14.4 Troubleshooting for Gas Valves START Is gas pressure at inlet of the valve correct for gas type? Note pressure found. No Fault elsewhere. Correct pressure problem. No Valve or ignition control faulty. Replace with one of correct type. No Valve faulty. Replace with one of correct type. No If problems persist, contact Roberts-Gordon LLC at www.rg-inc.
SECTION 15: REPLACEMENT PARTS SECTION 15: REPLACEMENT PARTS WARNING DANGER Electrical Shock Hazard Explosion Hazard Carbon Monoxide Hazard Fire Hazard Use only genuine ROBERTS GORDON® replacement parts per this installation, operation and service manual. Failure to follow these instructions can result in death, electric shock, injury or property damage. See warnings and notes on Page 31, Section 13 before removing or replacing parts Replace in reverse order.
UHD LOW PROFILE DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL 15.2 Burner Compartment Burner Compartment Cover The burner compartment is a sealed compartment. Following any work, re-seal the compartment with the gas pipe rubber seal fully in place and all screws fitted and tight. Viewing port for flame probe Flame Probe NOTE: Flexible duct only applies for model UHDS. Ignition Electrode Remove flexible air duct from spigot Remove screws and pull off burner cover 15.2.
SECTION 15: REPLACEMENT PARTS 15.3 Ignition Electrode and Flame Probe Inshot Burners Manual Reset Limit Switch (Position may vary.) Flame Probe Flame Probe Limit Switch Burner Compartment Front Views Ignition Electrode Ignition Electrode .120 (3 mm) spark gap Inshot Burners To replace the electrode or flame probe, remove the electrical lead and screw. Pull out from mounting. Refit in reverse ensuring that the gap to burner is as shown in the front view of the burner compartment.
UHD LOW PROFILE DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL 15.5 Flue Blower Vertical Installation To remove the blower, remove screws securing the fan and mounting plate to the vent box. To remove the blower from the mounting plate, remove screws. Refit in reverse order. To change the vent and air intake orientation from back to top, remove the blower and mounting plate as above. Remove intake (if applicable) and exhaust covers from top of the heater.
SECTION 15: REPLACEMENT PARTS 15.6 Pressure Switch Pull off 3 way connector. Spring open plastic clips of mounting cradle. Replace with correct type of pressure switch for model. The pressure switches are color coded for each pressure setting. Carry out a start-up after working on or changing a pressure switch. See Page 26, Section 11.
UHD LOW PROFILE DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL SECTION 16: SPECIFICATIONS 16.1 Dimension Data TOP VIEW F D 4 x 3/8" Captive Nuts Provided Air Intake (UHD[X]S only; Optional Position) N E Flue (Optional Position) Q P R F T Duct Flange REAR VIEW Flue J C T M G B SIDE VIEW F H Air Intake (UHD[X]S only) Thermostat Connection Gas Supply Electrical Supply K S S L A Model A B C D E F G H J K L M N P Q R S T UHD[X][S] 75 in (cm) 28.5 72.4 17.
SECTION 16: SPECIFICATIONS 16.2 General Technical Data Table Model UHD[X][S] 75 UHD[X][S] 100 UHD[X][S] 125 A 1 2 2 CFM 850 950 1020 °F ( °C) 68 (37) 78 (43) 92 (51) Heat Exchanger Pressure Drop @ Minimum Air Volume in wc 0.06 0.05 0.06 Maximum Air Volume CFM 2650 3660 4750 °F ( °C) 22 (12) 22 (12) 20 (11) in wc 0.36 0.55 0.
UHD LOW PROFILE DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL 46 of 47
® ® SECTION 17: ROBERTS GORDON COMBAT UHD-SERIES WARRANTY ® ® SECTION 17: ROBERTS GORDON COMBAT UHD-SERIES WARRANTY The ownership of the ROBERTS GORDON COMBAT ROBERTS-GORDON LLC WILL PAY FOR: ® Within 24 months from date of purchase by buyer or 27 months from the date of shipment by Roberts-Gordon LLC (whichever comes first), replacement parts will be provided free of charge for any part of the product which fails due to a manufacturing or material defect.
® Wa r m Air Heating OWNER WARRANTY REGISTRATION CARD Mail or Fax to: Roberts Gordon LLC • 1250 William Street, P.O. Box 44 • Buffalo, NY 14240-0044 • Phone: 716-852-4400 • Fax: 716-852-0854 Toll Free: 800-828-7450 • www.rg-inc.