Page 2 - : If the temperature rise exceeds 85°F, the heat exchanger may fail
All installations and services must be performed by qualified service personnel. 1 I. SAFETY SECTION This page and the following two pages contain various warnings and cautions found throughout this furnace Service and Installation Manual. Please read and comply with the statements on the cover and ...
Page 7 - recreational vehicles.
All installations and services must be performed by qualified service personnel. 6 II. GENERAL INSTRUCTIONS AND CLEARANCES NOTE: READ THIS SECTION BEFORE STARTING INSTALLATION 1. This furnace is equipped with orifices for operation with natural gas. For conversion to propane gas, see instructions in...
Page 8 - Combustible material:
All installations and services must be performed by qualified service personnel. 7 : The area around the furnace must be kept free and clear of combustible materials, especially papers and rags. : This furnace is not to be used as a construction heater. 6. Definitions of "combustible" and ...
Page 9 - III. FURNACE SPECIFICATIONS; PROPANE 11
All installations and services must be performed by qualified service personnel. 8 III. FURNACE SPECIFICATIONS MODEL GMD1-60 GMD1-80 HEAT INPUT RATE (BTUH) 60,000 80,000 HEATING CAPACITY (BTUH) 49,000 65,000 BURNER ORIFICE-NAT. GAS (MM) #38 2.45 BURNER ORIFICE-PROP. GAS (DMS) #52 #53 GAS SUPPLY PRES...
Page 10 - BLOWER DATA
All installations and services must be performed by qualified service personnel. 9 BLOWER DATA GMD1-60 MANUFACTURER: MORRISON PRODUCTS, INC. BLOWER MODEL: 10-7, DIRECT DRIVE NOMINAL MOTOR POWER OUTPUT (HORSEPOWER): 1/3 TYPICAL AIRFLOW @ SPECIFIED EXTERNAL STATIC PRESSURES (SCFM @. IN.W.G.): ESP (IN ...
Page 11 - connect a ducted return air system directly to
All installations and services must be performed by qualified service personnel. 10 IV. INSTALLATION A. ROOF JACK The roof jack assembly and accessories must be listed by a nationally recognized testing agency for the appropriate heating fuel. The roof jack assembly must be installed according to th...
Page 13 - Figure 2
All installations and services must be performed by qualified service personnel. 12 D. BASE INSTALLATION 1. Combustible Floor Base Model: 70-BASE Use the base bottom panel as a template to mark floor opening locations (see Figure 2). Cut a square opening in the floor for the supply air connector duc...
Page 14 - Figure 3
All installations and services must be performed by qualified service personnel. 13 If the combustion air passageway cannot terminate outside of the skirting or enclosure, a permanent opening with a minimum of 50 square inches of unobstructed infiltration (free area) for ventilation air must be prov...
Page 15 - CAUTION: A permanent opening with a minimum of 50 square inches of; must; be provided; Figure 4
All installations and services must be performed by qualified service personnel. 14 CAUTION: A permanent opening with a minimum of 50 square inches of unobstructed infiltration (free area) for ventilation and combustion air must be provided to the interior of the structure. Additional make-up air...
Page 16 - HAZARD OF
All installations and services must be performed by qualified service personnel. 15 F. CLOSET INSTALLATION WARNING: HAZARD OF ASPHYXIATION: A suction effect will occur when the furnace is operating inside the closet with the closet door closed. For proper operation, the furnace blower shall create...
Page 18 - Figure 6
All installations and services must be performed by qualified service personnel. 17 plate is supplied with the furnace for adapting the 3-inch round flex combustion air duct to the 2-inch x 7-inch combustion air duct. Recommended materials for the combustion air duct are smooth, round, galvanized st...
Page 23 - Seconds for one revolution; GAS PRESSURE CHART FOR ALL GMD1-60 and GMD1-80 MODEL; SUPPLY PRESSURE; TABLE 2
All installations and services must be performed by qualified service personnel. 22 BTU at sea level must be reduced to a firing rate of 64,000 (80,000 x .80 = 64,000) at an elevation of 5,000 feet. If the furnace is installed at an elevation of 2,000 feet or less, no reduction in input is required....
Page 25 - Figure 8; F. If the outlet or supply duct
All installations and services must be performed by qualified service personnel. 24 Figure 8 M. SETTING TEMPERATURE RISE The GMD1-60N and GMD1-80N is designed and wired at the factory for a heating blower speed that should result in an approximate temperature rise of 70 ° F. The blower motor is wire...
Page 26 - N. FURNACE CHECKOUT PROCEDURE; b. Block return air opening or disconnect blower motor leads.
All installations and services must be performed by qualified service personnel. 25 N. FURNACE CHECKOUT PROCEDURE Before any system of gas piping is finally put into service, it shall be carefully tested to assure that it is gas tight as indicated in section IV. H. Gas Piping of this manual. NOTICE:...
Page 27 - The sequence of operation of the furnace.
All installations and services must be performed by qualified service personnel. 26 V. INSTALLER'S INSTRUCTIONS TO USER: After completing the installation, the installer shall inform and/or demonstrate to the homeowner: 1. The location of all the instructions in the furnace must be kept along with i...
Page 28 - VI. STARTING THE UNIT
All installations and services must be performed by qualified service personnel. 27 VI. STARTING THE UNIT FLAME MUST BE DETECTED WITHIN 4 SECONDS IF FLAME IS DETECTED, THE DELAY-TO-FAN-ON TIME BEGINS (45 SECONDS) IF FLAME IS NOT DETECTED, THE GAS VALVE IS DE-ENERGIZED, THE IGNITOR IS TURNED OFF AND ...
Page 30 - VII. TROUBLESHOOTING; BEFORE TROUBLESHOOTING, FAMILIARIZE YOURSELF WITH THE
All installations and services must be performed by qualified service personnel. 29 VII. TROUBLESHOOTING THIS SECTION IS ONLY TO BE PERFORMED BY TRAINED, QUALIFIED SERVICE PERSONNEL, AND NOT BY THE FURNACE OWNER. NOTICE: BEFORE TROUBLESHOOTING, FAMILIARIZE YOURSELF WITH THE START UP AND CHECKOUT PRO...
Page 31 - : Power must be disconnected before servicing; If the
All installations and services must be performed by qualified service personnel. 30 DIAGNOSTIC FEATURES : Power must be disconnected before servicing . The 50A65-143 control continuously monitors its own operation and the operation of the system. If a failure occurs, the LED will indicate a failure ...
Page 36 - VIII. DEALER MAINTENANCE; Personal injury or property damage could result from repair or; Shut off gas and disconnect power before continuing.
All installations and services must be performed by qualified service personnel. 35 VIII. DEALER MAINTENANCE A qualified heating contractor should perform the following maintenance procedures at the beginning of each heating season. Correct any deficiencies at once. WARNING: Personal injury or pro...
Page 37 - be cleaned or
All installations and services must be performed by qualified service personnel. 36 Figure 9 C. INDUCER BLOWER ASSEMBLY Inspect 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 porti...
Page 38 - be; G. HOUSE AIR BLOWER; Some motors are permanently lubricated; and should not be oiled.; Set the room thermostat above room temperature.
All installations and services must be performed by qualified service personnel. 37 Vent pipes should also be inspected for any signs of corrosion, deterioration, or leakage that may cause combustion by-products to infiltrate the home or indoor environment. If signs of corrosion, deterioration, or l...
Page 39 - IX. USER INFORMATION SECTION; The area around the furnace should be kept free and clear of
All installations and services must be performed by qualified service personnel. 38 IX. USER INFORMATION SECTION A. WARNINGS AND CAUTIONS: : If you suspect there is a problem with the furnace, pertaining to the venting system or any other related problem, immediately contact a qualified service agen...
Page 42 - APPENDIX A – REPLACEMENT PARTS
All installations and services must be performed by qualified service personnel. 41 APPENDIX A – REPLACEMENT PARTS
Page 44 - APPENDIX B – WIRING DIAGRAM
All installations and services must be performed by qualified service personnel. 43 APPENDIX B – WIRING DIAGRAM