Thermo Products omd-70 service manual

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: If you do not follow these instructions exactly, a fire or explosion may result causing personal injury, loss of life or property damage.

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

: 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.

: 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 limit and shut down or it may cause asphyxiation.

: Because of the potential of odorant 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.

: All gas pipe connections must be leak tested using a strong soap and water solution (with the gas turned on). Any leaks must be repaired immediately after turning off the gas supply. A final test for gas leakage must be made after purging the gas line.

: DO NOT wet electronic components during the leak test. Wetting electronic components may damage circuitry and cause a hazardous situation. Dry moisture from all leads and terminals if wetting occurs. Wait at least 24 hours for the circuit to fully dry before energizing the system.

: 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 or 13.9 inches W.G. The furnace can be isolated from the gas supply by closing its manual shut off valve at test pressures equal to or less than 1/2 PSIG or 13.9 inches W.G.

: Copper and brass tubing and fittings (except tin lined) shall not be used if the gas contains more than a trace (0.3 grains per 100 cubic ft.) of hydrogen sulfide gas. Check with your gas supplier.

: All local codes and ordinances take precedence with regard to tank and oil lines. All lines must have shutoff valves, a good pipe joint compound approved for use with oil on all pipe threads, no kinks, no sharp bends and be properly tested for leaks. Flare fittings are recommended for tubing.

: Do not use motor oil or any fuel other than No. 1 or No. 2 fuel oil in this furnace.

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Contents DOWN FLOW & DIRECT VENT SEALED COMBUSTION MODEL: OMD-70 INSTALLATION AND SERVICE MANUALFOR YOUR SAFETY GAS-FIREDOR OIL-FIREDFURNACEI. SAFETY SECTION If you do not follow these instructions exactly, a fire or explosion may result causing personal injury, loss of life or property damage Do not attempt to start the burner when All installations and services must be performed by qualified service personnel POWER SWITCH TABLE OF CONTENTS SECTIONBEGINNING PAGE a. Combustible material MODELS OMD/GMD b.Non-combustiblematerialIII. FURNACE SPECIFICATIONS MODELGMD-85 BLOWER DATA BURNER DATAIV. INSTALLATION A. ROOF JACK B. STANDARD CHIMNEYC.FURNACE LOCATION Figure 1A D. BASE INSTALLATIONCombustible Floor Base Model: 70-BASE Cottage Base Model: 01COT-BASE1. Combustible Floor Base Model: 70-BASE 2. Cottage Base Model: OMCCOT-BASE 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. using high temperature silicone caulk and/or aluminum tape F. CLOSET INSTALLATION E. ALCOVE INSTALLATIONG. COMBUSTION AIR 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. NOTE: Combustion air cannot be drawn from the occupied space of the home Figure H. FUEL PIPING 2. Oil Tank and Piping OMD-70 All installations and services must be performed by qualified service personnel Figure J. ELECTRICAL WIRING 1.Electrical Branch Supply Circuit TERMINAL DEFINITIONS & FIELD WIRING 4. BLOWER CONTROLLER INFORMATION FOR PSC MOTORB. Outputs A. InputsC. Operating Modes DIAGNOSTIC FEATURES PSC TROUBLE SHOOTING5. WIRING DIAGRAM K. BURNER INSTALLATION L.BURNER OPERATION AND ADJUSTMENT 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 CO2 or oxygen O2, carbon monoxide CO, smoke for oil furnaces, and stack temperature. In order to achieve the most efficient combustion possible, the following steps must be taken BURNER COMBUSTION PARAMETERS M. FLUE GAS COMBUSTION ANALYSISA. TROUBLESHOOTING V. DEALER MAINTENANCENote: Check diagnostic code through view port OMD/GMD TROUBLESHOOTING FLOWCHARTprior to removing doors Are the thermostat wires closed? If 120 VAC is After fuel valve opens, does the burner ignite? Has the high limit thermostat C.HEAT EXCHANGER CLEANING INSTRUCTIONS B.CAD CELL CHECKOUT PROCEDURE: OMD ONLYD. CLEANING OR REPLACING FLUE PIPES E. EXTENDED SHUTDOWN A. WARNINGS AND CAUTIONS VI. USER INFORMATION SECTIONFigure C. INSPECTION AREAS B. COMPONENT LOCATIONSD.FILTER LOCATION AND CLEANING INSTALLATION / SERVICEE. CONTACT INFORMATION APPENDIX A. REPLACEMENT PARTS LIST