User ManualTable of ContentsGAS-FIRED FURNACE1DOWN FLOW & DIRECT VENT (SEALED COMBUSTION)1MODELS: GMD1-60N and GMD1-80N1INSTALLATION AND SERVICE MANUAL1FOR YOUR SAFETY1WHAT TO DO IF YOU SMELL GAS1I. SAFETY SECTION2TABLE OF CONTENTS4III. FURNACE SPECIFICATIONS 86IV. INSTALLATION 106H. GAS PIPING 186I. ELECTRICAL WIRING 196V. INSTALLER’S INSTRUCTIONS TO USER 266C. INSPECTION AREAS 396APPENDIX A – REPLACEMENT PARTS 416APPENDIX B – WIRING DIAGRAM 436II. GENERAL INSTRUCTIONS AND CLEARANCES7NOTE: READ THIS SECTION BEFORE STARTING INSTALLATION71. This furnace is equipped with orifices for operation with natural gas. For conversion to propane gas, see instructions in Gas Conversion Section of this manual.72. Any reference to L.P. or Propane gas in this manual, any other labels, or markings on this furnace is to be construed to be propane HD-5. A commercial grade of liquefied petroleum gases composed of a minimum of 90 percent liquid propane (C8H8).73. The selection of a furnace heating capacity for a proposed installation should be based on a heat loss calculation made according to the manuals provided by the Air Conditioning Contractors of America (ACCA) or the American Society of Heating, Refr...7III. FURNACE SPECIFICATIONS9ALCOVE8CLOSET8GAS SUPPLY PRESSURE (IN.W.G.)9MINIMUM REQUIRED9GAS MANIFOLD PRESSURE (IN. W.G.)9ELECTRICAL SUPPLY: 115 VAC / 60HZ / 1 PHASE9MAXIMUM TIME DELAY TYPE FUSE OR HACR BREAKER RATING: 15 AMPS9DIMENSIONS & WEIGHTS:9CABINET: WIDTH - 18 IN., DEPTH – 25-3/4 IN., HEIGHT - 57 IN.9WARM AIR DUCT: WIDTH – 12 IN., DEPTH – 12 IN.9FILTER QUANTITY & SIZE: 1 – 18” x 24 “9PRODUCT LISTED UNDER ETL FILE NUMBER –9BLOWER DATA10MANUFACTURER: MORRISON PRODUCTS, INC.10BLOWER MODEL: 10-7, DIRECT DRIVE10STATIC PRESSURES (SCFM @. IN.W.G.):10MANUFACTURER: MORRISON PRODUCTS, INC.10BLOWER MODEL: 10-9, DIRECT DRIVE10STATIC PRESSURES (SCFM @. IN.W.G.):10A. ROOF JACK11B. STANDARD CHIMNEY11C. FURNACE LOCATION11Combustible Floor Base12Model: 70-BASE12Figure 1A12Cottage Base12Model: 01COT-BASE12Figure 1B12Coil Cabinet12Model: CE111S / CE211T12Figure 1C12CE111S CE211T D. BASE INSTALLATION121. Combustible Floor Base Model: 70-BASE13Figure 213Figure 3142. Cottage Base Model: O1COT-BASE14E. ALCOVE INSTALLATION15Alcove installations must use the No. 70 mobile home base.15Refer to section G. COMBUSTION AIR for additional combustion air requirements.15Figure 415F. CLOSET INSTALLATION16G. COMBUSTION AIR17Figure 618H. GAS PIPING19I. ELECTRICAL WIRING20If the heat anticipator is set too high, the furnace may delay activation of a heating cycle for too long. If the heat anticipator is set too low, the furnace may cycle too frequently. Either condition may not provide optimal comfort to the homeowner.21J. INITIAL START UP:22TABLE 223Figure 825VI. STARTING THE UNIT28VII. TROUBLESHOOTING30DIAGNOSTIC FEATURES31VIII. DEALER MAINTENANCE36A qualified heating contractor should perform the following maintenance procedures at the beginning of each heating season. Correct any deficiencies at once.36 WARNING: Personal injury or property damage could result from repair or service of this furnace by anyone other than a qualified heating contractor. Only the homeowner/user routine maintenance described in the Users Information Manual may be perfo...36 WARNING: To avoid injury from moving parts, shut off the power to the furnace before removing blower compartment door.36 CAUTION: Label wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation.36A. ELECTRICAL:361. Check all wiring for loose connections and any signs of damage or unusual wear.362. Check for correct voltage at the furnace when operating.363. Check amp-draw on blower motor and inducer motor to assure they are not exceeding nameplate amp rating.364. Check for correct operation and proper settings (if manually adjustable) of all controls.36Shut off gas and disconnect power before continuing.36B. BURNERS36If it appears that material is accumulating in the burner box, the burner box cover can be removed and the box and burners can be vacuumed. If necessary, the burners assembly can be removed by taking out the two screws/one on each bracket on top of b...36Figure 937C. INDUCER BLOWER ASSEMBLY37Inspect the pressure switch and tubing connections and inspect the blower/assembly for warpage, deterioration and carbon or other build-up. If necessary, clean the accessible portions of the housing and blower with a damp cloth. Vacuum to remove any...37D. INSPECTING THE VENTING SYSTEM37E. GASKETS/SEALING MATERIALS38F. HEAT EXCHANGER38G. HOUSE AIR BLOWER38H. EXTENDED SHUTDOWN38ON SHUT DOWN:38ON START-UP:38IX. USER INFORMATION SECTION39A. WARNINGS AND CAUTIONS:39B. COMPONENT LOCATIONS40Figure 1040C. INSPECTION AREAS40D. FILTER LOCATION AND CLEANING41See Figure 10, in this section, for the location of the return air filter.41APPENDIX A – REPLACEMENT PARTS42APPENDIX B – WIRING DIAGRAM44Size: 2.34 MBPages: 44Language: EnglishOpen manual