Thermo Pride GMC-85 Installation And Service Manual
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Thermo Pride GMC-85 Installation And Service Manual

Gas-fired or oil-fired furnace down flow & direct vent (sealed combustion)
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GAS-FIRED OR OIL-FIRED FURNACE
DOWN FLOW & DIRECT VENT (SEALED COMBUSTION)
MODELS: OMC-70 AND GMC-85
INSTALLATION AND SERVICE MANUAL
For installation in:
1. Manufactured Homes
2. Modular Homes/Buildings
3. Site Construction—Residential (Single Story Dwellings)
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or
any other appliance.
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Immediately call your gas supplier from a neighbor's phone.
Follow the gas supplier's instructions.
• If you cannot reach your gas supplier, call the fire department.
:
If the information in these instructions is not followed exactly, a fire or explosion may result
causing property damage, personal injury or loss of life.
: Improper installation, adjustment, alteration, service, or maintenance can cause injury or property
damage. Refer to this manual. For assistance or additional information consult a qualified installer, service
agency, or fuel supplier.
: Do not use this appliance if any part has been underwater. Immediately call a qualified service
technician to inspect the appliance and to replace any part of the electrical or control system that has been
underwater.
PLEASE READ THESE INSTRUCTIONS PRIOR TO INSTALLATION, INITIAL FIRING, AND BEFORE
PERFORMING ANY SERVICE OR MAINTENANCE. THESE INSTRUCTIONS MUST BE LEFT WITH THE USER
AND SHOULD BE RETAINED FOR FUTURE REFERENCE BY QUALIFIED SERVICE PERSONNEL.
MO-422
ECN 4528-MA

FOR YOUR SAFETY

WHAT TO DO IF YOU SMELL GAS
THERMO PRODUCTS, LLC.
POST OFFICE BOX 217
NORTH JUDSON, IN 46366
PHONE: (574) 896-2133
:
MADE IN USA

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Summary of Contents for Thermo Pride GMC-85

  • Page 1: For Your Safety

    GAS-FIRED OR OIL-FIRED FURNACE DOWN FLOW & DIRECT VENT (SEALED COMBUSTION) MODELS: OMC-70 AND GMC-85 INSTALLATION AND SERVICE MANUAL For installation in: 1. Manufactured Homes 2. Modular Homes/Buildings 3. Site Construction—Residential (Single Story Dwellings) Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.

  • Page 2: 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 the statements below. All local codes and ordinances must be followed with regard to the oil tank and oil lines.
  • Page 3 If you do not follow these instructions exactly, a fire or explosion may result causing personal injury, loss of life or property damage. NEVER use gasoline or a mixture of oil and gasoline to start the burner or furnace. HAZARD OF ASPHYXIATION: Negative pressure inside the closet with closet door closed and the furnace blower operating shall be no more negative than minus 0.05 inch water column.
  • Page 4 If you suspect there is a problem with the furnace, the venting system or any other related problem, immediately contact a qualified service agency. If a service agency is not available contact your fuel supplier. Personal injury, or property damage, could result from major repair or service of this furnace by anyone other than a qualified contractor.
  • Page 5 All installations and services must be performed by qualified service personnel. This page and the following page contain reproductions of the various warning and instruction labels placed on the Thermo Pride Oil Furnace. Please read and comply with the contents of these labels.
  • Page 6 All installations and services must be performed by qualified service personnel. POWER SWITCH...

  • Page 7: Table Of Contents

    SECTION SAFETY SECTION GENERAL INSTRUCTIONS AND CLEARANCES III. FURNACE SPECIFICATIONS INSTALLATION A. ROOF JACK B. STANDARD CHIMNEY C. FURNACE LOCATION D. BASE INSTALLATION 1. Combustible Floor Base Model: 70-BASE 2. Cottage Base Model: OMCCOT-BASE E. ALCOVE INSTALLATION F. CLOSET INSTALLATION G.

  • Page 8: General Instructions And Clearances

    II. GENERAL INSTRUCTIONS AND CLEARANCES NOTE: READ THIS SECTION BEFORE STARTING INSTALLATION 1. 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, Refrigeration and Air Conditioning Engineers, Inc.
  • Page 9 b. Non-combustible material: “...material that is not capable of being ignited and burned; such as material consisting entirely of, or a combination of, steel, iron, brick, concrete, slate, asbestos, glass, and plaster.” This heating appliance must be installed with clearances to combustible material surfaces of not less than the minimum distances given below.

  • Page 10: Furnace Specifications

    APPROXIMATE SHIPPING WEIGHT: 240 LBS. PRODUCT LISTED UNDER UL FILE NUMBER -- MP3241 OMC-70 85,000 71,000 0.65X80A --------- --------- --------- --------- --------- --------- --------- --------- GMC-85 85,000 69,700 ------- #17 DMS #36 DMS ------- 13.9 13.9 10 + 0.3 3.5 + 0.3...
  • Page 11 TYPICAL AIRFLOW ON LOW FAN SPEED @ SPECIFIED EXTERNAL STATIC PRESSURES (SCFM @ .IN.W.G.): ALL SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE. BURNER DATA OMC-70 WAYNE COMBUSTION SYSTEMS 3-5/8 BLOWER DATA 780 @ 0.2, GMC-85 P265 FEP 3-5/8 -------- MHC (FIBER) -------- 650 @ 0.5...

  • Page 12: Installation

    In lieu of local codes, when installing the OMC-70 with fuel oil, refer to the latest edition of the installation standard NFPA 31, Installation of Oil Burning Equipment. When installing the GMC-85 with natural or LP gases, refer to Appendix G of the latest edition of the installation standard NFPA 54, National Fuel Gas Code.
  • Page 13 All installations and services must be performed by qualified service personnel. Combustible Floor Base Model: 70-BASE Figure 1A. Cottage Base Model: 01COT-BASE...

  • Page 14: Base Installation

    All installations and services must be performed by qualified service personnel. Figure 1B. D. BASE INSTALLATION 1. Combustible Floor Base Model: 70-BASE Referring to Figure 1A, for applications using a combustion air channel and a supply air duct, use the base as a template to mark the floor opening locations. See Figure 2 for cutout locations. Cut a square opening in the floor for the supply air duct.

  • Page 15: Cottage Base Model: Omccot-Base

    All installations and services must be performed by qualified service personnel. 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 provided for adequate combustion. This permanent opening must be located no less than 12 inches from the bottom of the enclosure or skirting.
  • Page 16 All installations and services must be performed by qualified service personnel. IMPORTANT: Adequate combustion air must be provided under all circumstances. If the underside of the home is skirted or enclosed (e.g. by an enclosed crawlspace), the combustion air intake should exit through the side of cottage base and terminate outside of the structure. All joints and seams of supply ducts and combustion air ducts must be closed with a sealing method suitable to the application conditions and temperatures (e.g.

  • Page 17: Alcove Installation

    E. ALCOVE INSTALLATION In this application, a minimum of 18 inches of clearance must be provided to the front of the unit. Refer to Figure 4. Alcove installations must use the No. 70 mobile home base. Refer to section G. COMBUSTION AIR for additional combustion air requirements.

  • Page 18: Combustion Air

    2. The return air opening may be located in the top, the center or (ideally) the bottom of the closet door, or side wall. Do not obstruct any return air openings, including the return grille on the furnace. To do so may cause the furnace to activate the high temperature limit and shutdown, or it may cause asphyxiation.
  • Page 19 All installations and services must be performed by qualified service personnel. The preferred location of the outside combustion air intake termination (e.g. an optional stainless steel intake hood, part no.370183) is through the side of the structure, skirting or enclosure. An alternate termination location is under the structure in the skirted or crawlspace area providing a minimum of 50 square inches of free area exists around the perimeter for outside combustion air to be drawn through.
  • Page 20 All installations and services must be performed by qualified service personnel. Figure 6.

  • Page 21: Fuel Piping

    Sizing and installation of fuel lines must be in accordance with federal, state and local regulations. 1. General Gas Piping (GMC-85) Because of the potential of the odorant to fade, a gas leak may not be detected by smell. If this furnace is installed below grade, contact your gas supplier for a gas detector.

  • Page 22: Oil Tank And Piping

    The furnace and its gas valve must be disconnected from the gas supply during pressure testing of the gas supply system at pressures in excess of 1/2 PSIG (13.9 inches W.G.). The furnace can be isolated from the gas supply by closing the manual gas shutoff valve serving the appliance at test pressures equal to, or less than, 1/2 PSIG or (13.9 inches W.G.).
  • Page 23 All installations and services must be performed by qualified service personnel. If possible, install the tubing under the floor. Specific information on piping, fuel pump connections, lift capabilities and tank installations is provided in the fuel pump manufacturer’s instructions. If the oil tank is located inside the building and the tank capacity is between 10 and 660 gallons, it shall not be located within 5 feet horizontally from any source of heat, or oil- burning appliance.

  • Page 24: Electrical Wiring

    All installations and services must be performed by qualified service personnel. Figure 7. J. ELECTRICAL WIRING All electrical wiring must be installed in strict accordance with local ordinances and codes. In the absence of local ordinances and codes, all electrical wiring must conform to the requirements of the National Electric Code, ANSI/NFPA 70-1999, or latest edition.

  • Page 25: Electrical Branch Supply Circuit

    1. Electrical Branch Supply Circuit Route all electrical wiring to the left side of the furnace. The power supply circuit to the furnace must be installed and grounded in accordance with the provisions of the National Electrical Code, ANSI/NFPA-70-1999, or latest edition, and all local codes having jurisdiction.
  • Page 26 All installations and services must be performed by qualified service personnel. Once the furnace is installed, check the thermostat anticipator the proper nominal setting. a. Connect a multimeter, capable of reading milliamps (mA), in series with the low voltage wires to the thermostat. b.

  • Page 27: Wiring Diagram

    All installations and services must be performed by qualified service personnel. 4. WIRING DIAGRAM...

  • Page 28: Burner Installation

    K. BURNER INSTALLATION The burner mounts to the furnace on three mounting bolt studs, located on the burner mounting plate, in the lower portion of the vestibule, directly in front of the heat exchanger. The burner insertion depth has been fixed by the factory for the design-specified, combination of the air tube length and the combustion chamber used with the furnace.

  • Page 29: Burner Operation And Adjustment

    8. The furnace is now ready for burner adjustment, refer to the following “BURNER OPERATION AND ADJUSTMENT” section. L. BURNER OPERATION AND ADJUSTMENT NEVER burn garbage or refuse in the furnace. NEVER try to ignite oil or gas by tossing burning papers or other material into your furnace. If you do not follow these instructions exactly, a fire or explosion may result causing personal injury, loss of life or property damage.
  • Page 30 replacement parts for location identification). After the furnace is warmed up to a steady- state condition (about 15 minutes), the final burner adjustment should be made using combustion instrumentation for measuring carbon dioxide (CO monoxide (CO), smoke (for oil furnaces), and stack temperature. In order to achieve the most efficient combustion possible, the following steps must be taken.

  • Page 31: Flue Gas Combustion Analysis

    #1 OR #2 FUEL OIL NATURAL GAS 50PPM OR LESS 50PPM OR LESS 11-12% 8.75-10% 4.5-6% 5.9-3.8% 0 TO TRACE OPEN TO OPEN TO POSITION 35 POSITION 4 N/A = NOT APPLICABLE GMC-85 PROPANE GAS 50PPM OR LESS 9.5-11% 6.7-4.5% OPEN TO POSITION 4...

  • Page 32: Dealer Maintenance

    THIS SECTION IS ONLY TO BE PERFORMED BY TRAINED, QUALIFIED SERVICE PERSONNEL, AND NOT BY THE FURNACE OWNER. A. TROUBLESHOOTING When testing electrical equipment, always follow standard electrical procedures and precautions. 1. Check for line voltage (110-120VAC) to the furnace. If there is no line voltage applied to the furnace, check that disconnecting switch is “on”, fuses or circuit breakers have not blown or tripped.
  • Page 33 Set thermostat subbase to "HEAT" Does thermostat make contact? Is room temperature above 90 deg. F? Is room temperature above thermostat setting? Replace thermostat Does a "call for heat" initiate an Is the power switch "off"? ignition cycle? Is there 120 VAC across lines L1 &...
  • Page 34 Is there combustion airflow to the furnace? Are the thermostat wires connected properly? Is the transformer (GMC) or oil primary control (OMC) supplying 24 VAC to the thermostat? Replace control transformer (GMC) or try resetting the oil primary control (OMC). Replace the oil primary control, if necessary.
  • Page 35 All installations and services must be performed by qualified service personnel. After pre-purge, does the ignition control (GMC) or the oil primary (OMC) produce a spark at the ignition electrodes? While ignition electrodes are sparking does fuel valve open? Is there 24 VAC across the power terminals of the ignition control module (GMC) or 120 VAC across the ignition transformer (OMC)?
  • Page 36 After fuel valve opens, does the burner ignite? Does the burner stay lit past proof of flame check? Does the fan timer energize the circulating air blower after the 56 second time delay? For the GMC, measure gas supply pressure at inlet to gas valve.
  • Page 37 Does system run until thermostat is satisfied? Does burner shut off when thermostat is satisfied? Does the circulating air blower turn off after thermostat is satisfied within 4 minutes? Troubleshooting Complete. Has the high limit thermostat or auxiliary high limit thermostat activated? Check for reduced airflow through the furnace.

  • Page 38: Cad Cell Checkout Procedure

    B. CAD CELL CHECKOUT PROCEDURE: (OMC ONLY) 1. Remove cad cell lead wires, then start the burner. Shortly after burner starts, place a temporary jumper between terminals f & f of the oil primary control. Connect ohmmeter across cad cell lead wires - resistance should be less than 1600 ohms. 2.

  • Page 39: Heat Exchanger Cleaning Instructions

    C. HEAT EXCHANGER CLEANING INSTRUCTIONS The heat exchanger must be cleaned by a qualified service person. For oil-fired units, it is important to inspect and clean the heat exchanger once a year, or as necessary, to remove any build-up of soot. A layer of soot on the inside of the heat exchanger will act as an insulator, reducing heat transfer, resulting in reduced efficiency For gas-fired units, the presence of a layer of soot on the heat exchanger is a strong indicator of incomplete combustion.

  • Page 40: Cleaning Or Replacing Flue Pipes

    All installations and services must be performed by qualified service personnel. Figure 8. Reassemble the furnace to the original factory-built condition. Remount the burner, being certain that the air tube is properly inserted into the chamber opening. If heavy soot deposits were found in the heat exchanger, this indicates that the burner may be out of adjustment.

  • Page 41: Extended Shutdown And Restart

    Check all flue pipes for restrictions due to soot, or carbon build-up, as well as foreign matter, or any materials, that cause the venting system to restrict the proper venting of combustion products. If a restriction is found, the flue pipe must be cleaned or replaced to ensure proper venting.

  • Page 42: Users Information Section

    VI. 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 agency. If a service agency is not available, contact your fuel supplier. Personal injury or property damage could result from major repair or service of this furnace by anyone other than a qualified contractor.

  • Page 43: Component Locations

    B. COMPONENT LOCATIONS The following diagram shows a typical furnace installation and typical position of the components referenced in these instructions. C. INSPECTION AREAS IMPORTANT: For safe operation it is the responsibility of the owner and/or user that the burner, chimney/vent pipe, heat exchanger and controls should be inspected every year by a qualified heating contractor.

  • Page 44: Filter Location And Cleaning

    2. EXTERIOR OF FURNACES: The furnace exterior should be inspected for signs of excessive heat such as discoloration of materials or damage from rust or corrosion. 3. VENT CONNECTOR: The furnace vent pipe should be inspected for signs of rust, corrosion pitting, or holes in the pipe.

  • Page 45: Appendix A. Replacement Parts List

    All installations and services must be performed by qualified service personnel. APPENDIX A. REPLACEMENT PARTS LIST...
  • Page 46 All installations and services must be performed by qualified service personnel.

This manual is also suitable for:

Omc-70

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