Thermo Products omd-70 service manual V. Dealer Maintenance, A. Troubleshooting

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

V. DEALER MAINTENANCE

THIS SECTION IS ONLY TO BE PERFORMED BY TRAINED, QUALIFIED SERVICE PERSONNEL, AND NOT BY THE FURNACE OWNER.

A. TROUBLESHOOTING

Note: Check diagnostic code through view port prior to removing doors.

: 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.

2.Make sure thermostat is “calling for heat”.

3.Check for adequate fuel supply and pressure. Are all the fuel shutoff valves are open?

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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 BEGINNING PAGE TABLE OF CONTENTSSECTION a. Combustible material MODELS OMD/GMD b.Non-combustiblematerialGMD-85 III. FURNACE SPECIFICATIONSMODEL BLOWER DATA BURNER DATAC.FURNACE LOCATION IV. INSTALLATION A. ROOF JACKB. STANDARD CHIMNEY 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 MAINTENANCEprior to removing doors Note: Check diagnostic code through view portOMD/GMD TROUBLESHOOTING FLOWCHART 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 LOCATIONSE. CONTACT INFORMATION D.FILTER LOCATION AND CLEANINGINSTALLATION / SERVICE APPENDIX A. REPLACEMENT PARTS LIST