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: 1. Ouvrir les fenêtres. 2. N’essayer pas d’allumer un appareil. 3. N’utiliser pas d’interrupteurs électriques. 4. N’utiliser pas de téléphone dans votre bâtiment. 5. Eteindre flamme nue. 6. Quitter le bâtiment. 7. Après avoir quitté le bâtiment, appelez immédiatement votre fournisseur local de gaz. Suivre les instructions du fournisseur de gaz. 8. Si vous ne pouvez pas joindre votre fournisseur de gaz, appeler 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: UHA[T][M][X][S]150 - 250 Label Placement ..............2 Figure 2: UHA[T][M][X][S]300 - 400 Label Placement ..............3 Figure 3: Installation Clearances and Clearances to Combustibles ..........................................................7 Figure 4: Suspension Methods .................................................9 Figure 5: Vent and Roof Detail ................................................
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.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL Figure 1: UHA[T][M][X][S]150 - 250 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* Proposition 65 Label 0-10VDC Modulating Label** Part Number 91040030 91010430 91039505 91010427 91010429 91010419 91010431 91010433 91010425 91010426 91070015 91040196 *For sep
SECTION 1: HEATER SAFETY Figure 2: UHA[T][M][X][S]300 - 400 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* Proposition 65 Label 0-10VDC Modulating Label** Part Number 91040030 91010430 91039505 91010427 91010429 91010419 91010431 91010433 91010425 91010426 91070015 91040196 *For separated combustion units only.
UHA STANDARD UNIT HEATER 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 UHA[T][M][X][S] heaters have automatic ignition burners for ON/OFF, HIGH/LOW or modulate within the range of HIGH/LOW operation. • Drop rods must be a minimum of 3/8" diameter mild steel. Four suspension points (3/8" nuts) are located on top of the heater. • Must be installed in a manner which allows access to all serviceable components. 3.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL SECTION 4: CLEARANCES TO COMBUSTIBLES 4.1 Required Clearances to Combustibles WARNING Fire Hazard Keep all flammable objects, liquids and vapours the minimum required clearances to combustibles away from heater. Some objects will catch fire or explode when placed close to heater. Failure to follow these instructions can result in death, injury or property damage.
SECTION 4: CLEARANCES TO COMBUSTIBLES Figure 3: Installation Clearances and Clearances to Combustibles Installation Clearances Clearances to Combustibles Roof Terminal (Optional separated combustion concentric venting shown.) Top Wall Terminal 24" (61 cm) for adequate air flow access axial fan. 6" (15 cm) 6" (15 cm) 10' (3 m) 18' (5.5 m) - 20' (6.1 m) Max. Mounting Height* * Recommended mounting height varies with heater input.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL SECTION 5: NATIONAL STANDARDS AND APPLICABLE CODES 5.1 Gas Codes The type of gas appearing on the serial 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.
SECTION 6: HEATER INSTALLATION SECTION 6: HEATER INSTALLATION 6.1 General Heaters are designed for installation above 6' (1.8 m). These heaters must be installed within the heated space. Duct delivery systems are not permitted with axial fan units. When handling or supporting the heater from below, ensure that the weight is taken at the support points. The gas or electrical supply lines must not be used to support the heater.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL SECTION 7: VENTING WARNING Carbon Monoxide Hazard Heaters must be vented outdoors. Heaters must be installed according to the installation manual. Failure to follow these instructions can result in death or injury. regulators and relief equipment. 7.1.2 Canadian Requirements The vent shall not terminate within 6' (1.8 m) of a mechanical air supply inlet to any building. The vent shall not terminate within 3' (.
SECTION 7: VENTING concentric vent box and a concentric vent/air intake pipe penetrates the wall or roof. See Page 15, Figure 9 and Page 16, Figure 10. For separated combustion installation, the vent and air intake must be fitted with an individual and correctly sized sealed system and the vent and air intake must terminate at approved wall and roof terminals. Separated combustion units may not be common vented. Completely seal all joints, refer to Page 10, Section 7.2.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL dampers and any other gas-burning piece(s) of equipment to their previous conditions of use. 7. If improper venting is observed during any of the above tests, the venting system must be corrected by a contractor qualified in the installation and service of gas-fired equipment or your local gas supplier. If the venting must be resized, use appropriate tables in (US) Appendix G of NFPA 54/ANSI Z223.
SECTION 7: VENTING Figure 6: Standard Vented Heater - Vertical and Horizontal Vent Termination Vent Termination Flashing (By Others) 12" (31 cm) Minimum from roof to vent termination Listed thimble through combustible roof Vent Vertical Option 90° Bend Horizontal Option Listed thimble through combustible wall Flashing (By Others) Vent Termination Vent 12" (31 cm) Minimum from wall to vent termination NOTE: Vent supports not shown.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL Figure 7: Standard Vented Heater - Common Vertical Vent Termination Type "B" vent cap (7" [18 cm] or 8" [20 cm]) may be used. (These are not available from the manufacurer.) SIDE VIEW Type "B" Vent Pipe 2'(.6 m) Minimum Roof Flashing Roof The last section of vent pipe passing through the roof or wall may be Type "B" vent pipe. All other vent materials in the building must be single wall vent pipe.
SECTION 7: VENTING Figure 8: Separated Combustion Heater - Vertical and Horizontal Vent Termination Model **Vent Diameter Part Number UHA[T][M][X]S 150 - 400 4" (10 cm) 90502102 Model *Air Intake Diameter Part Number UHA[T][M][X]S 150 - 250 4" (10 cm) 90502102 UHA[T][M][X]S 300 - 400 5" (13 cm) 90502105 Figure 9: Concentric Vent Box pace ) airsers) m c /4" (6 y oth ter, 1 alent. (B e m a v ) di or equi 0 cm 4" (1 odel RV f o irk M piece One vent.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL Figure 10: Concentric Vertical and Horizontal Vent Termination - Separated Combustion Heater Vent Terminal with Baffle Plate 4" (10 cm) Type B-1Vent Combustion Air Terminal 6" (16 cm) Minimum 12" (31 cm) Maximum UHAS 150-250: 6" (15 cm) Diameter Single Wall UHAS 300-400: 8" (20 cm) Diameter Single Wall Storm Collar (By Others) (Attach with 3 sheet metal screws) Flashing (By Others) 12" (31 cm) Minimum from roof to combustion air termin
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 (UHA[T][M][X]S), the air for combustion is drawn in from outside the building. It is important to ensure that there is adequate space around heater to provide air for the axial air distribution fan. 8.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL SECTION 9: GAS PIPING WARNING Fire Hazard Connect gas supply according to Figure 11. 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 11: Gas Connection CAUTION Product Damage Hazard Hold gas nipple securely with pipe wrench when attaching flexible gas connector. Failure to follow these instructions can result in product damage. Option A: Stainless Steel Flexible Gas Connector • Do not twist flexible gas connector. • Ensure all joints are gas tight.
UHA STANDARD UNIT HEATER 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 serial plate for electrical rating for proper circuit sizing.
SECTION 10: WIRING 10.2 Low Voltage Thermostat for Models UHA[T][M][X][S] 150-400 NOTE: Models 300-400 have two axial fans. NOTE: Electrical supply is located below terminal strip.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 10.3 UHA[X][S] Series Internal Wiring Diagram for Single Stage Gas Valves NOTE: For field wiring into service junction box, or if any of the original wire supplied with the heater must be replaced, it must be replaced with wiring material having a temperature rating of at least 221° F (105° C) and 600 volts. For supply connections use No. 14 AWG or larger wires.
SECTION 10: WIRING 10.4 UHA[X][S] Series Ladder Wiring Diagram for Single Stage Gas Valves NOTE: For field wiring into service junction box, or if any of the original wire supplied with the heater must be replaced, it must be replaced with wiring material having a temperature rating of at least 221° F (105° C) and 600 volts. For supply connections use No. 14 AWG or larger wires.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 10.5 UHA[T][X][S] Series Internal Wiring Diagram for Two Stage Gas Valves HIGH COMMON LOW W2 HIGH/LOW CONTROL 1 NOTE: For field wiring into service junction box, or if any of the original wire supplied with the heater must be replaced, it must be replaced with wiring material having a temperature rating of at least 221° F (105° C) and 600 volts. For supply connections use No. 14 AWG or larger wires.
SECTION 10: WIRING 10.6 UHA[T][X][S] Series Ladder Wiring Diagram for Two Stage Gas Valves HIGH STAGE NOTE: For field wiring into service junction box, or if any of the original wire supplied with the heater must be replaced, it must be replaced with wiring material having a temperature rating of at least 221° F (105° C) and 600 volts. For supply connections use No. 14 AWG or larger wires.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 10.7 UHA[M][X][S] Series Internal Wiring Diagram for Modulating Gas Valves NOTE: For field wiring into service junction box, or if any of the original wire supplied with the heater must be replaced, it must be replaced with wiring material having a temperature rating of at least 221° F (105° C) and 600 volts. For supply connections use No. 14 AWG or larger wires.
SECTION 10: WIRING 10.8 UHA[M][X][S] Series Ladder Diagram for Modulating Gas Valves NOTE: For field wiring into service junction box, or if any of the original wire supplied with the heater must be replaced, it must be replaced with wiring material having a temperature rating of at least 221° F (105° C) and 600 volts. For supply connections use No. 14 AWG or larger wires.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 10.9 Electrical Connection to the Heater Note: Junction box is not provided with heater. Conduit can also be attached directly to heater with wire junction made within the heater cabinet.
SECTION 11: OPERATION AND MAINTENANCE 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.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 11.2 Begin Start-Up 11.2.1 Before Operating the Heater To ensure that all the controls are in safe working order, operate the heater for the first time with the isolating gas valve turned off and power supply turned on. 1. Turn off the isolating gas valve. 2. Turn up the thermostat above room temperature. The automatic ignition sequence will now begin as described on Page 30, Figure 12.
SECTION 11: OPERATION AND MAINTENANCE Figure 13: Single Stage Gas Valve for Models UHA[X][S] 150 - 400 TOP VIEW Regulator ½PSI END VIEW C IN ON OFF Outlet Pressure Gas Inlet Description Gas Valve 150 - 250 NG Gas Valve 150 - 250 LP Gas Valve 300 - 400 NG Gas Valve 300 - 400 LP Part Number 90032505 90032506 90032520 90032521 I l tP Figure 14: Two Stage Gas Valve for Models UHA[T][X][S] 150 - 400 TOP VIEW Regulator END VIEW LO ½PSI HI C IN ON OFF Gas Inlet Description Gas Valve 150 - 250 NG
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL Figure 15: Modulating Gas Valve for Models UHA[M][X][S] 150 - 400 Description Gas Valve 150 - 250 NG Gas Valve 150 - 250 LP Gas Valve 300 - 400 NG Gas Valve 300 - 400 LP 1/2" Exa Valve 150-250 3/4" Exa Valve 300-400 32 of 59 Part Number 90032505 90032506 90032520 90032521 90032550 90032551
SECTION 11: OPERATION AND MAINTENANCE 11.2.2 Start-Up the Gas Valve (All Gases) 11.2.2.1 Check Burner Gas Pressure (Single Stage) 1. Remove the plug in the outlet (burner) pressure test point and connect a pressure tap and a manometer. Page 31, Figure 13. 2. With the burner firing, measure the pressure on the manometer.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 11.3 Pressure Switch The pressure switch is factory pre-set for each model and is not adjustable. 11.4 Turning Off the Heater Set the thermostat to the "OFF" position or lowest setting and the main burner will stop. The fan(s) will continue to run until it is stopped automatically by the fan thermostat. Do not use a disconnect switch for control of heater. Disconnect switch will turn off the fan. Heat exchanger could be damaged.
SECTION 12: USER INSTRUCTIONS SECTION 12: USER INSTRUCTIONS 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.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL Figure 16: LED Diagnostic Codes LED INDICATION FAULT MODE Slow Flash Normal Operation - No call for heat. Fast Flash Normal Operation - Call for heat. 2 Flashes Ignition Lockout - No flame detected. 3 Flashes Airflow Fault - Pressure switch open or closed. 4 Flashes Temperature Limit Switch Open 5 Flashes Flame Sense Error - Gas valve not energized.
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.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL and electrical supply. Remove the fan(s) and use a small brush or duster to clean the fan blades from each side. Replace fan when done. See Page 53, Section 15.10. 13.4 Heat Exchanger Maintenance The heat exchanger will remain clean unless a problem has developed with combustion. Inspect the heat exchanger. Look for signs of overheating at the front tubes which may indicate burner over firing or persistently low air flows. 13.
SECTION 13: SERVICING Vent Pipe/Terminals Venting must be intact. Using a flashlight, look for obstructions, cracks on the pipe, gaps in the sealed areas or corrosion. The area must be free of dirt and dust. Remove any carbon deposits or scale using a wire brush. If the vent terminal has a screen built in, remove any dirt, dust or deposits from the screen. See Page 10, Section 7 through Page 17, Section 8. Cabinet Exterior After installation, touch up scratches.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL Silicone Tubing Ensure tight, secure fit on all pressure fittings at pressure switch and vent box. Gas Valve Verify that cap covering pressure regulator adjustment screw is secure and has not been tampered with. Verify all wiring connections. Condensate Drain (when installed) Wall Tag 40 of 59 Flush drain and clear any obstructions. If a wall tag is present, make sure it is legible and accurate.
SECTION 14: TROUBLESHOOTING 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.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 14.
SECTION 14: TROUBLESHOOTING 14.2 Troubleshooting For Automatic Ignition Burner Systems For your safety and optimum heater performance, use only replacement parts sold and supplied by Roberts-Gordon LLC. Conduct start-up procedure as shown on Page 29, Section 11.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 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.
SECTION 14: TROUBLESHOOTING 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.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL SECTION 15: REPLACEMENT PARTS WARNING DANGER Electrical Shock Hazard Explosion Hazard Fire Hazard Carbon Monoxide 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 important information on Page 37, Section 13 before removing or replacing parts.
SECTION 15: REPLACEMENT PARTS 15.2 Burner Compartment for Models UHA[T][M][X][S] 150-400 Side View of Burner Compartment with Hinged Door Removed Before burner removal, remove the 10 screws holding the filler panel on and remove the filler panel. NOTE: Models UHA 300-400 have two axial fans. 15.2.1 Burner Compartment without Filler Panel for Models UHA[T][M][X][S] 150-400 Side View of Burner Compartment with Filler Panel Removed Burner assembly must be removed to service orifices, manifold or burners.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 15.2.2 Burner Injectors for Models UHA[T][M][X][S] 150-400 Remove 4 screws to remove manifold. Ensure gas tight fitting of injectors. Ensure correct alignment with burners. Ensure all pipe joints are gas tight. MODEL Orifice Quantity UHA UHA UHA UHA UHA UHA UHA UHA [T][M][X][S] [T][M][X][S] [T][M][X][S] [T][M][X][S] [T][M][X][S] [T][M][X][S] [T][M][X][S] [T][M][X][S] 150 175 200 225 250 300 350 400 7 8 9 10 11 12 14 14 43 43 2.
SECTION 15: REPLACEMENT PARTS 15.3 Ignition Electrode and Flame Probe for Models UHA[T][M][X][S] 150-400 To replace the ignition 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.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 15.4 Heat Exchanger The heat exchanger consists of a four-pass design with 1.75" outer diameter [aluminized steel] [409 stainless steel] tube. The tube plates are made of [aluminized steel] [409 stainless steel]. The tube supports are made of [aluminized steel] [409 stainless steel]. 15.
SECTION 15: REPLACEMENT PARTS 15.6 Flue Blower for Models UHA[T][M][X][S] 150-300 Remove screws securing outlet flange to the flue adapter. Refit in reverse order. Disconnect electrical connections at plug in tabs. Remove screws securing flue fan mounting plate to vent box. Remove screws securing mounting plate to fan. (Not shown) Refit in reverse. Use new gaskets. Ensure sealed joints. Ensure mounting plate orifice is clear and not obstructed.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 15.7 Flue Blower for Models UHA[T][M][X][S] 350-400 Rear Panel Flue Adapter to Flue Blower screw Hole Remove screws securing outlet flange to the flue adapter. Refit in reverse order. Vent Box Flue Outlet Adapter Gasket Vent Box screws Flue Blower Disconnect electrical connections at plug in tabs. Remove screws securing flue blower mounting plate to vent box.
SECTION 15: REPLACEMENT PARTS 15.8 Pressure Switch WARNING Carbon Monoxide Hazard Use correct pressure switch specified for each model. Use of incorrect pressure switch or disabling pressure switch circuit could cause unsafe condition. Failure to follow these instructions can result in death or serious injury. 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.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 15.10.1 Fan Removal and Replacement 15.11 Limit Switches 15.11.1 Removal and Replacement 1. Remove the electrical connections to the switch. 2. Unscrew the two screws securing the switch. 3. Fit a new switch with two screws. 4. Reconnect the electrical connections and test operation. WARNING Severe Injury Hazard Turn off gas and electrical supply before service. Fan can start automatically at any time.
SECTION 16: SPECIFICATIONS SECTION 16: SPECIFICATIONS 16.1 Dimension Data for Models UHA[T][M][X][S] 150-250 Model UHA[T][M][X][S]150 UHA[T][M][X][S]175 UHA[T][M][X][S]200 UHA[T][M][X][S]225 UHA[T][M][X][S]250 A in (cm) 42.4 (107.7) 42.4 (107.7) 42.4 (107.7) 42.4 (107.7) 42.4 (107.7) B in (cm) C in (cm) 26.7 (67.8) 26.7 (67.8) 35.0 (88.9) 35.0 (88.9) 35.0 (88.9) 25.5 (64.8) 25.5 (64.8) 25.5 (64.8) 25.5 (64.8) 25.5 (64.8) D in (cm) 17.6 (44.7) 17.6 (44.7) 17.6 (44.7) 17.6 (44.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 16.2 General Technical Data Table Model Full Load Amps @ 120 V UHA[T][M][X][S] UHA[T][M][X][S] UHA[T][M][X][S] UHA[T][M][X][S] UHA[T][M][X][S] 175 150 200 225 250 A 10.6 10.6 10.6 10.6 10.
SECTION 16: SPECIFICATIONS 16.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL UHA[T][M][X][S]300 UHA[T][M][X][S]350 UHA[T][M][X][S]400 A Model in (cm) 52.3 (132.8) 52.3 (132.8) 52.3 (132.8) B in (cm) 43.2 (109.7) 43.2 (109.7) 43.2 (109.7) C in (cm) 25.5 (64.8) 25.5 (64.8) 25.5 (64.8) D in (cm) 24.7 (62.7) 24.7 (62.7) 24.7 (62.7) E in (cm) 19.4 (49.3) 19.4 (49.3) 19.4 (49.3) F in (cm) 30.0 (76.2) 30.0 (76.2) 30.0 (76.2) G in (cm) 7.0 (17.8) 7.0 (17.8) 7.0 (17.8) H in (cm) 11.
SECTION 17: THE ROBERTS GORDON® UHA-SERIES WARRANTY SECTION 17: THE ROBERTS GORDON® UHA-SERIES WARRANTY ROBERTS-GORDON LLC WILL PAY FOR: READ YOUR INSTALLATION, OPERATION AND SERVICE MANUAL Within 24 months from date of purchase by buyer or 27 months from 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.