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  • Form RGM 434, Mfg No. 98126 Rev 8, Page 1

    INSTALLATION FORM RGM 434 (Version A)Obsoletes 434-8

    APPLIES TO: Installation/Operation/Service

    Model F and BGas-Fired, Gravity-Vented

    Unit Heaters

    GENERALInstallation should be done by a qualified agency in accordancewith the instructions in this manual and in compliance with allcodes and requirements of authorities having jurisdiction. Theinstructions in this manual apply to the unit heater models shownon the right.

    FOR YOUR SAFETY

    The use and storage of gasoline or otherflammable vapors and liquids in opencontainers in the vicinity of this appliance ishazardous.

    WARNING: Gas-fired appliances are notdesigned for use in hazardous atmospherescontaining flammable vapors or combustibledust, in atmospheres containing chlorinatedor halogenated hydrocarbons, or inapplications with airborne silicone substances.See Hazard Levels, Page 2.

    WARNING: Improper installation, adjust-ment, alteration, service, or maintenance cancause property damage, injury or death. Readthe installation, operation, and maintenanceinstructions thoroughly before installing orservicing this equipment.

    FOR YOUR SAFETYIf you smell gas:1. Open windows.2. Don't touch electrical switches.3. Extinguish any open flame.4. Immediately call your gas supplier.

    Index by Page No.Belt Tension ........................................ 20Blocked Vent Switch .................... 21, 30Blower ................................................. 28Blower Motor ...................................... 19Blower Rotation ................................. 20Blower Speed Adjustment .................. 20Blower/Filter Cabinet (Optional) ........ 26Burner Air Adjustment ....................... 21Burner Orifices .................................... 28Burner Rack Removal ......................... 26Burners ................................................ 21Flash Carryover ................................... 28Check Installation and Start-Up ......... 22Clearances .............................................. 6Combustion Air ..................................... 6Confined Space Installation .................. 6Dimensions ........................................... 3

    Index by Page No.Downturn Air Nozzles (Optional) ...... 23Duct Flange (Model B Option) .......... 24Electrical Supply and Connections ...... 12Energy Cutoff Control (ECO) ....... 21, 29Fan ................................................. 28, 29Fan Control .......................................... 20Fan Motor ........................................... 19Gas Piping and Pressures ................... 11Gas Valve ..................................... 21, 29Guards (Model B Option) .................. 25Hanger Kits (Optional) ......................... 8HAZARD INTENSITY LEVELS ........ 2Heat Exchanger ................................... 28Ignition Systems ........................... 21, 28Installation Codes .................................. 2Limit Control ................................ 21, 29Unit Heater Location ............................. 5

    Index by Page No.Multiple Heater Control (Optional) ..... 25Operating Sequence ............................ 22Pilot .............................................. 21, 27Polytube Adapter (Model B Option) .. 24SERVICE AND MAINTENANCE ...... 26Start-Up ............................................... 22Suspending the Unit ............................. 8Thermostat Connections ............... 12, 19Troubleshooting .................................. 31Uncrating and Preparation ..................... 5Gas Valve ..................................... 21, 29Vent ................................................ 9, 29Horizontal/Vertical Vent Outlet ............. 6Power Venter (Optional) ...................... 24Vertical Louvers (Optional) ................ 23Warranty ............................................... 2TYPICAL WIRING DIAGRAMS . 13-18

    Table of ContentsInstallation and Operation .......................... Paragraphs 1-24Check Installation and Start-Up ................ Paragraph 25Optional Equipment .................................... Paragraphs 26-33Service/Maintenance/Troubleshooting ....... Paragraphs 34-44

    Model Fuel Vent Air Delivery

    F Gas-Fired Gravity Propeller Fan

    B Gas-Fired Gravity Centrifugal Blower (heater may be attached to ductwork)

    REFERENCE: Replacement Parts, Form RGM 726

  • Form RGM 434, Mfg No. 98126 Rev 8, Page 2

    1. Installation CodesThe gas-fired unit heaters covered in this manual are design-certifiedby the American Gas Association and approved by the Canadian GasAssociation for use with either natural or propane gas. The type of gasfor which your heater is equipped and the correct firing rate are shownon the rating plate attached to your unit. Electrical characteristics areshown on the motor nameplate and on the unit rating plate.

    These units must be installed in accordance with local building codes.In the absence of local codes, in the United States, the unit must beinstalled in accordance with the National Fuel Gas Code (latest edi-tion). A Canadian installation must be in accordance with the CAN/CGA B149.1 and B149.2 Installation Code for Gas Burning Appli-ances and Equipment. These codes are available from CSA Informa-tion Services, 1-800-463-6727. Local authorities having jurisdictionshould be consulted before installation is made to verify local codesand installation procedure requirements.

    Clearances from the heater and vent to combustible construction ormaterial in storage must conform with the National Fuel Gas CodeANSI Z223.1a (latest edition) pertaining to gas-burning devices, andsuch material must not attain a temperature over 160oF by continuedoperation of the heater.

    Special Installations (Aircraft Hangars/Garages)Installations in aircraft hangars should be in accordance with ANSI/NFPA No. 409 (latest edition), Standard for Aircraft Hangars; in pub-lic garages in accordance with ANSI/NFPA No. 88A (latest edition),Standard for Parking Structures; and for repair garages in accordancewith ANSI/NFPA No. 88B (latest edition), Standard for Repair Ga-rages. ANSI/NFPA-88 (latest edition) specifies overhead heaters mustbe installed at least eight feet above the floor. In Canada, installationsin aircraft hangars should be in accordance with the requirements ofthe enforcing authorities, and in public garages in accordance with CAN/CGA B149 codes.

    ANSI/NFPA 409 (latest edition) specifies a clearance of ten feet to thebottom of the heater from the highest surface of the top of the wing orengine enclosure of whatever aircraft would be the highest to be housedin the hangar, and a minimum clearance of eight feet from the floor inother sections of aircraft hangars, such as the offices, and shops whichcommunicate with areas used for servicing or storage. The heaters mustbe located so as to be protected from damage by aircraft or other ob-jects such as cranes and movable scaffolding. In addition, the heatersmust be located so as to be accessible for servicing, adjustment, etc.

    2. WarrantyRefer to limited warranty information on the warranty card in the"Owner's Envelope".

    WARRANTY: Warranty is void if......a. Unit Heaters are used in atmospheres containing flammable

    vapors or atmospheres containing chlorinated or halogenatedhydrocarbons or airborne silicone substances.

    b. Wiring is not in accordance with the diagram furnished with

    the heater.c. Unit is installed without proper clearances to combustible ma-

    terials or located in a confined space without proper ventila-

    tion and air for combustion. (See Paragraphs 6 and 7.)d. Fan-type unit heater is connected to a duct system.

    HAZARD INTENSITY LEVELS

    1. DANGER: Failure to comply will result in severe personal injury or death and/or property damage.

    2. WARNING: Failure to comply could result in severe personal injury or death and/or property damage.

    3. CAUTION: Failure to comply could result in minor personal injury and/or property damage.

  • Form RGM 434, Mfg No. 98126 Rev 8, Page 3

    3. DimensionsFan-Type, Gravity-Vented Unit Heater

    Suspension Notes: Use Dimension "G" for two-point suspension and "E" and "F" for four- point suspension. (Two-point suspension isstandard; four-point is optional. Four-point suspension is available either factory or field installed.)

    Horizontal Vent Position

    Vertical VentPosition

    Dimensions (inches)Size A B C D E F G H I J K L M N

    Nat Pro

    25 30-5/32 13-9/16 27-1/16 31-7/16 5-27/32 14-7/16 14-1/32 19 4 Rnd 10-9/32 16 1/2 1/2 21-1/2 27-21/3250 30-5/32 13-9/16 27-1/16 31-7/16 5-27/32 14-7/16 14-1/32 19 4 Rnd 10-9/32 16 1/2 1/2 21-1/2 27-21/3275 30-5/32 15-9/16 27-1/16 31-7/16 5-27/32 14-7/16 14-1/32 19 5 Oval 10-17/32 16 1/2 1/2 21-1/2 27-21/32100 30-5/32 17-9/16 30-7/16 31-7/16 5-27/32 14-7/16 14-1/32 19 6 Oval 12-29/32 16 1/2 1/2 21-1/2 27-21/32125 32 23-5/16 30-7/16 31-7/16 5-27/32 14-7/16 14-1/32 17-15/16 7 Oval 14-7/16 16 1/2 1/2 21-1/2 28-1/2165 40-5/32 20-5/16 35-7/16 35-15/16 4-7/8 19-15/32 15-23/32 23-13/32 8 Oval 14-9/32 24 1/2 1/2 27 36-25/32200 40-5/32 23-5/16 36-3/16 35-15/16 4-7/8 19-15/32 15-23/32 23-13/32 8 Oval 14-13/32 24 1/2 1/2 27 36-25/32250 40-5/32 28-13/16 36-3/16 35-15/16 4-7/8 19-15/32 15-23/32 21-13/16 10 Oval 12-11/32 24 1/2 1/2 27 38-3/8300 40-5/32 28-13/16 36-11/16 35-15/16 4-7/8 19-15/32 15-23/32 21-13/16 10 Oval 12-11/32 24 3/4 1/2 27 38-3/8400 40-5/32 37-1/16 37-5/16 35-15/16 4-7/8 19-15/32 15-23/32 21-13/16 12 Oval 13 24 3/4 1/2 27 38-3/8

    Dimensions (mm)Size A B C D E F G H I J K L M N

    Nat Pro

    25 766 344 687 799 148 367 356 19 102 Rnd 261 406 13 13 546 702

    50 766 344 687 799 148 367 356 19 102 Rnd 261 406 13 13 546 702

    75 766 395 687 79

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