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. 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..........
15.12 Ignition Control....................................................... 54 15.13 Axial Fan/Guard/Motor Assembly........................... 54 15.14 Limit Switches........................................................ 55 SECTION 16: Specifications ................................................ 56 16.1 Dimension Data for Models UHA[T][X][S] 150-250.. 56 16.2 General Technical Data Table .................................. 57 16.3 Technical Data Table ................................................
TABLE OF FIGURES Figure 1: UHA[T][X][S]150 - 250 Label Placement ...................2 Figure 2: UHA[X][S]300 - 400 Label Placement........................3 Figure 3: Installation Clearances and Clearances to Combustibles .............................................................7 Figure 4: Suspension Methods ............................................... 10 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][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 Part Number 91031107 91010430 91039505 91010427 91010429 91010441 91010431 91010433 91010425 91010426 91070015 *For separated combustion units only.
SECTION 1: HEATER SAFETY Figure 2: UHA[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 Part Number 91031107 91010430 91039505 91010427 91010429 91010441 91010431 91010433 91010425 91010426 91070015 *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. Addison 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][X][S] heaters have automatic ignition burners for ON/OFF or HIGH/LOW operation only. Technical Data Table on Page 57, Section 16.2 and Page 59, Section 16.5. • 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 vapors the required clearances to combustibles away from heater. Some objects can 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.) 6" (15 cm) Top 6" (15 cm) Wall Terminal 24" (61 cm) for adequate air flow access axial fan. 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 5: NATIONAL STANDARDS AND APPLICABLE CODES 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.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 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.
SECTION 7: VENTING SECTION 7: VENTING WARNING 100-73 standards. High temperature silicone sealant must have a minimum temperature rating of 480° F (250° C). 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.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 7.2.1 Standard Vented Heaters (Models UHA[T][X] 150-250 and Models UHA[X] 300-400) The vent must be fitted with a low resistance terminal. See Page 13, Figure 5 through Page 15, Figure 7. Standard vented heaters do not allow outdoor air intake for combustion air. 7.2.2 Separated Combustion Heaters (Models UHA[T][X]S 150-250 and Models UHA[X]S 300-400) The heaters are designed to be installed as separated combustion heaters.
SECTION 7: VENTING 7.8 Replacing an Existing Heater in a Venting System When replacing an existing heater in a venting system, the venting system may not be properly sized to vent the new heater. The following steps must be followed with each appliance connected to the venting system placed in operation, while any other appliances connected to the venting system are not in operation. 1. Seal any unused openings in the venting system. 2.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 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.
SECTION 7: VENTING 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.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL Figure 8: Separated Combustion Heater - Vertical and Horizontal Vent Termination Air Intake Termination Vent Termination 12" (31 cm) Minimum from air inlet to vent termination. 24" (62 cm) Minimum from roof to vent termination. 12" (31 cm) Minimum from roof to bottom of air intake.
SECTION 7: VENTING 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 terminal Concentric Vent Box 6" (16 cm) Minimum 12"
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 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][X]S), the air for combustion is drawn in from outside the building.
SECTION 9: GAS PIPING 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.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 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.
SECTION 10: WIRING SECTION 10: WIRING DANGER 10.1.1 Fan Control The heater’s axial fan can be used during the offseason for air circulation. A low voltage programmable thermostat with fan switch (P/N 90425400) must be used. For thermostat connection details, See Page 22, Section 10.2 and Page 22, Section 10.3. For the use of multiple heaters on one thermostat, See Page 23, Section 10.4 and Page 24, Section 10.5. Electrical Shock Hazard Disconnect electric before service.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 10.2 Low Voltage Thermostat with One Heater for Models UHA[T][X][S] 150-250 Terminal Strip 24 Volt Thermostat Heating Only CWGR W R Gas Supply NOTE: Electrical supply is located below terminal strip. 24 Volt Thermostat with Fan Control Terminal Strip CWGR C W NOTE: Electrical supply is located below terminal strip. G R Gas Supply 10.
SECTION 10: WIRING 10.4 Low Voltage Thermostat with Multiple Heaters (Models UHA[T][X][S]150 - 250) FRONT VIEW Transformer Relay BACK VIEW Low Voltage Thermostat 1 4 COIL Black R 3 2 5 6 COIL W C G Y Purple Black White Red Heater 1 Heater 2 120V-60 Hz supply circuit Gnd. L Gnd. N L N L N Heater 3 Gnd. Heater 4 Gnd. Gnd. Red/Yellow L N L N NOTE: If both the heat and fan only operations are to be used, two relays will be required per group of heaters.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 10.5 Low Voltage Thermostat with Multiple Heaters (Models UHA[X][S]300 - 400) FRONT VIEW Transformer Relay BACK VIEW Low Voltage Thermostat 1 4 Black COIL R 3 2 5 C 6 COIL W G Y Purple Black White Red Heater 1 120V-60 Hz supply circuit Gnd. L N L N Gnd. Heater 2 Gnd. Red/Yellow L N NOTE: If both the heat and fan only operations are to be used, two relays will be required per group of heaters.
SECTION 10: WIRING 10.6 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 105° C (221° F) 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[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 105° C (221° F) and 600 volts. For supply connections use No. 14 AWG or larger wires.
SECTION 10: WIRING 10.8 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 105° C (221° F) and 600 volts. For supply connections use No. 14 AWG or larger wires.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 10.9 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 105° C (221° F) and 600 volts. For supply connections use No. 14 AWG or larger wires.
SECTION 10: WIRING 10.10 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.
UHA STANDARD UNIT HEATER 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 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 31, Figure 12.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 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 Inlet Pressure 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 Figure 14: Two Stage Gas Valve for Models UHA[T][X][S] 150 - 250 TOP VIEW Regulator END VIEW LO ½PSI HI C IN ON OFF Gas Inlet D
SECTION 11: OPERATION AND MAINTENANCE 11.2.2 Start-Up the Gas Valve (All Gases) The fan will continue to run until it is stopped automatically by the fan thermostat. 11.2.2.1 Check Burner Gas Pressure 1. Remove the plug in the outlet (burner) pressure Do not use a disconnect switch for control of heater. Disconnect switch will turn off the fan. test point and connect a pressure tap and a Heat exchanger could be damaged. Warranty will manometer. not cover damage to the heat exchanger if 2.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 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.
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 Page 47, Section 15.3.1. Clean any deposits from the main burner which may have formed in the injectors or venturi of the burner. 3. Check condition of ignition electrode and flame probe. Clean off any deposits which may have formed, check condition of ceramic insulators. Replace as required. See Page 49, Section 15.5. 13.3 Fan/Motor Assembly Maintenance The main fan bearings are permanently sealed and do not need lubrication.
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 11, Section 7 through Page 18, 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 38 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 Addison. Conduct start-up procedure as shown on Page 30, 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. NOTE: Minimum flame probe current 1 μA DC. Typical flame probe current 3-5 μA DC.
SECTION 14: TROUBLESHOOTING 14.4 Troubleshooting for Gas Valves 14.5 Troubleshooting for Flue Blower For your safety and optimum heater performance, use only genuine replacement parts sold and supplied by Addison. Conduct start-up procedure as shown on Page 30, Section 11.
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 ADDISON® 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 35, Section 13 before removing or replacing parts.
SECTION 15: REPLACEMENT PARTS 15.2 Burner Compartment for Models UHA[T][X][S] 150-250 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. Filler Panel Burner Assembly 15.2.1 Burner Compartment without Filler Panel for Models UHA[T][X][S] 150-250 Side View of Burner Compartment with Filler Panel Removed Screws 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][X][S] 150-250 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[T][X][S] 150 UHA[T][X][S] 175 UHA[T][X][S] 200 UHA[T][X][S] 225 UHA[T][X][S] 250 7 8 9 10 11 Natural Gas (G20) Orifice Marking P/N 43 43 2.25 mm 2.25 mm 2.
SECTION 15: REPLACEMENT PARTS 15.3 Burner Compartment for Models UHA[X][S] 300-400 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. Burner Compartment Cover Flame Probe Viewing port for flame probe Remove flexible air duct from spigot Ignition Electrode NOTE: Flexible duct only applies for model UHAS.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 15.4 Ignition Electrode and Flame Probe for Models UHA[T][X][S] 150-250 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.
SECTION 15: REPLACEMENT PARTS 15.5 Ignition Electrode and Flame Probe for Models UHA[X][S] 300-400 Inshot Burners Inshot Burners Limit Thermostat Flame Probe Flame Probe Remove all burner compartment screws to remove the burner compartment and access the “Front View” Flame Probe Remove Screw Burner Compartment Front Views Ignition Electrode Ignition Electrode Inshot Burners .120 (3 mm) spark gap To replace the electrode or flame probe, remove the electrical lead and screw. Pull out from mounting.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 15.6 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 15.8 Flue Blower for Models UHA[T][X][S] 150-175 Remove screws securing outlet flange to the flue adapter. Rear Panel Refit in reverse order. Gasket Flue Fan Vent Box Disconnect electrical connections at plug in tabs. Remove screws securing flue fan mounting plate to vent box. Rear Panel 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 15.9 Flue Blower for Models UHA[T][X][S] 200-300 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) Mounting Plate Refit in reverse. Fan Plate Screws Flue Fan Gaskets MODEL Flue Blower P/N Use new gaskets.
SECTION 15: REPLACEMENT PARTS 15.10 Flue Blower for Models UHA[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. Mounting Plate Gasket Mounting Plate to Flue Blower screws Remove screws securing flue blower mounting plate to vent box.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 15.11 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.
SECTION 15: REPLACEMENT PARTS 15.13.1 Fan Removal and Replacement 15.14 Limit Switches 15.14.1 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.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL SECTION 16: SPECIFICATIONS 16.1 Dimension Data for Models UHA[T][X][S] 150-250 Heater must be supported at these points from above or below. TOP VIEW D 4 x 3/8" Captive Nuts Provided E SIDE VIEW F C REAR VIEW Air Intake (UHA[T][X]S only) H Thermostat Connection K G B Flue J M Gas Supply Electrical Supply N L A Model UHA[T][X][S]150 UHA[T][X][S]175 UHA[T][X][S]200 UHA[T][X][S]225 UHA[T][X][S]250 A in (cm) 42.4 (107.
SECTION 16: SPECIFICATIONS 16.2 General Technical Data Table Model UHA[T][X][S] 150 UHA[T][X][S] 175 UHA[T][X][S] 200 UHA[T][X][S] 225 UHA[T][X][S] 250 A 10.6 10.6 10.6 10.6 10.6 CFM 3500 3500 3716 3716 3716 Flue Intake Size in (cm) 4 (10) 4 (10) 4 (10) 4 (10) 4 (10) Air Intake Size in (cm) 4 (10) 4 (10) 4 (10) 4 (10) 4 (10) *Maximum Straight Flue/Air Intake ft (m) 40 (1) 40 (1) 40 (1) 40 (1) 40 (1) Weight (Net) lbs (kg) 217 (98.4) 237 (107.5) 255 (115.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 16.4 Dimension Data for Models UHA[X][S] 300-400 TOP VIEW Heater must be supported at these points from above or below.
SECTION 16: SPECIFICATIONS UHA[X][S]300 UHA[X][S]350 UHA[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) 11.2 (28.4) 11.2 (28.4) 11.2 (28.4) J in (cm) 13.8 (35.
UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 60 of 59
SECTION 17: THE ADDISON® UHA-SERIES WARRANTY SECTION 17: THE ADDISON® UHA-SERIES WARRANTY ADDISON 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 Addison (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. Addison will require the part in question to be returned to the factory.
