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6-583.25H80004A Rev. BMarch, 2009INSTALLATION AND SERVICE MANUALgas-fired unit heatersmodel HD and HDBAll models approved for use in California by the CEC, in NewYork city by the MEA division, and in Massachusetts. Unit heateris certified for residential and commercial applications.FOR YOUR SAFETYWARNING1. Improper installation, adjustment,alteration, service or maintenance cancause property damage, injury or death,and could cause exposure to substanceswhich have been determined by variousstate agencies to cause cancer, birthdefects or other reproductive harm. Readthe installation, operating and maintenanceinstructions thoroughly before installing orservicing this equipment.2. Do not locate ANY gas-fired units in areaswhere chlorinated, halogenated, or acidvapors are present in the atmosphere.These substances can cause prematureheat exchanger failure due to corrosion,which can cause property damage, seriousinjury, or death.FOR YOUR SAFETYWHAT TO DO IF YOU SMELL GAS:1. Open windows.2. Do not try to light any appliance.3. Do not touch any electrical switch; donot use any phone in your building.4. Immediately call your gas supplierfrom a neighbor’s phone. Follow the gassupplier’s instructions. If you can not reachyour gas supplier, call your fire department.The use and storage of gasoline or otherflammable vapors and liquids in opencontainers in the vicinity of this applianceis hazardous.IMPORTANTThe use of this manual is specificallyintended for a qualified installation andservice agency. All installation and serviceof these units must be performed by aqualified installation and service agency.Inspection on Arrival1.2.3.Inspect unit upon arrival. In case of damage, report itimmediately to transportation company and your localModine sales representative.Check rating plate on unit to verify that power supply meetsavailable electric power at the point of installation.Inspect unit upon arrival for conformance with description ofproduct ordered (including specifications where applicable).Table of ContentsInspection on Arrival . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Special Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2SI (Metric) Conversion Factors. . . . . . . . . . . . . . . . . . . . . . . . . 3Before you Begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Unit Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Combustible Material and Service Clearances . . . . . . . . . 4Unit Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Unit Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Gas Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Wiring/Blower Speed Adjustment . . . . . . . . . . . . . . . . . . 16Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Unit Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Service/Trouble Shooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21Unit Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22Serial/Model Number/Replacement Parts . . . . . . . . . . . . . . . 23Residential Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23Commercial Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24THIS MANUAL IS THE PROPERTY OF THE OWNER.PLEASE BE SURE TO LEAVE IT WITH THE OWNER WHEN YOU LEAVE THE JOB.

SPECIAL PRECAUTIONSSPECIAL PRECAUTIONSTHE INSTALLATION AND MAINTENANCE INSTRUCTIONS IN THISMANUAL MUST BE FOLLOWED TO PROVIDE SAFE, EFFICIENT ANDTROUBLE-FREE OPERATION. IN ADDITION, PARTICULAR CAREMUST BE EXERCISED REGARDING THE SPECIAL PRECAUTIONSLISTED BELOW. FAILURE TO PROPERLY ADDRESS THESECRITICAL AREAS COULD RESULT IN PROPERTY DAMAGE ORLOSS, PERSONAL INJURY, OR DEATH. THESE INSTRUCTIONSSUBJECT TO ANY MORE RESTRICTIVE LOCAL OR NATIONALCODES.HAZARD INTENSITY LEVELS1.2.3.4.DANGER: Indicates an imminently hazardous situationwhich, if not avoided, WILL result in death or serious injury.WARNING: Indicates a potentially hazardous situationwhich, if not avoided, COULD result in death or serious injury.CAUTION: Indicates a potentially hazardous situation which,if not avoided, MAY result in minor or moderate injury.IMPORTANT: Indicates a situation which, if not avoided,MAY result in a potential safety concern.DANGERAppliances must not be installed where they may be exposedto a potentially explosive or flammable atmosphere.WARNING1. Gas fired heating equipment must be vented - do notoperate unvented.2. A built-in power exhauster is provided - additional externalpower exhausters are not required or permitted.3. If you are replacing an existing heater, it may be necessaryto resize the venting systems. Improperly sized ventingsystems can result in vent gas leakage or the formation ofcondensate. Refer to the National Fuel Gas Code ANSIZ223.1 or CSA B149.1 latest edition. Failure to follow theseinstructions can result in injury or death.4. Under no circumstances should two sections of double wallvent pipe be joined together within one horizontal vent systemdue to the inability to verify complete seal of inner pipes.5. All field gas piping must be pressure/leak tested prior tooperation. Never use an open flame. Use a soap solutionor equivalent for testing.6. Gas pressure to appliance controls must never exceed 14"W.C. (1/2 psi).7. To reduce the opportunity for condensation, the minimumsea level input to the appliance, as indicated on the serialplate, must not be less than 5% below the rated input,or 5% below the minimum rated input of dual rated units.8. Disconnect power supply before making wiring connectionsto prevent electrical shock and equipment damage.9. All appliances must be wired strictly in accordance withwiring diagram furnished with the appliance. Any wiringdifferent from the wiring diagram could result in a hazard topersons and property.10. Any original factory wiring that requires replacement mustbe replaced with wiring material having a temperaturerating of at least 105 C.11. Ensure that the supply voltage to the appliance, as indicatedon the serial plate, is not 5% greater than the rated voltage.12. When servicing or repairing this equipment, use onlyfactory-approved service replacement parts. A completereplacements parts list may be obtained by contactingthe factory. Refer to the rating plate on the appliance forcomplete appliance model number, serial number, andcompany address. Any substitution of parts or controls notapproved by the factory will be at the owners risk.6-583.22CAUTION1. All literature shipped with this unit should be kept forfuture use for servicing or service diagnostics. Do notdiscard any literature shipped with this unit.2. Consult piping, electrical, and venting instructions in thismanual before final installation.3. Do not attach ductwork, air filters, or polytubes to anypropeller unit heater.4. Clearances to combustible materials are critical. Be sure tofollow all listed requirements.5. Do not locate units in tightly sealed rooms or smallcompartments (commonly referred to as confined spaces)without provisions for adequate combustion air and venting.Combustion air must have access to the confined spacethrough a minimum of two permanent openings in theenclosure, at least one near the bottom. They shouldprovide a free area of one square inch per 1,000 BTU/Hrinput rating of the unit with a minimum of 100 square inchesfor each opening, whichever is greater.6. Low profile heaters are designed for use in heating. applications with ambient temperatures between -40 F and 90 F.7. Do not install unit outdoors.8. In garages or other sections of aircraft hangars suchas offices and shops that communicate with areas used forservicing or storage, keep the bottom of the unit at least7' above the floor unless the unit is properly guardedto provide user protection from moving parts. In parkinggarages, the unit must be installed in accordance withthe standard for parking structures ANSI/NFPA 88A, andin repair garages the standard for repair garages NFPA#88B. In Canada, installation of heaters in airplanehangars must be in accordance with the requirementsof the enforcing authority, and in public garages inaccordance with the current CSA-B149 codes.9. In aircraft hangars, keep the bottom of the unit at least 10'from the highest surface of the wings or engine enclosureof the highest aircraft housed in the hangars and inaccordance with the requirements of the enforcing authorityand/or NFPA 409-latest edition.10. Installation of units in high humidity or salt wateratmospheres will cause accelerated corrosion resulting in areduction of the normal life of the units.11. Do not install units below 7' measured from the bottom ofthe unit to the floor in commercial applications (unlessunit is properly guarded to provide user protection frommoving parts)and 5' measured from the bottom of the unitto the floor in residential applications.12. Be sure no obstructions block air intake and discharge ofunit heaters.13. The minimum distance from combustible material is basedon the combustible material surface not exceeding 160 F.Clearance from the top of the unit may be required to begreater then the minimum specified if heat damage, otherthan fire, may occur to materials above the unit heater atthe temperature described.14. Allow 18" of clearance at rear (or 6" beyond end of motor atrear of unit, whichever is greater) and access side toprovide ample air for combustion and proper operation of fan.15. Installation must conform with local building codes or in theabsence of local codes, with Part 7, Venting of Equipment,of the National Fuel Gas Code, ANSI Z223.1 (NFPA 54) latest edition. In Canada installation must be in accordancewith CSA-B149.1.16. Purging of air from gas supply line should be performed asdescribed in ANSI Z223.1 - latest edition “National FuelGas Code”, or in Canada in CSA-B149 codes.