Thermo Products omd-70 service manual K. Burner Installation

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

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. The combustion chamber is pre-positioned during the assembly process and held in place by the drum and mounting plate. The burner insertion depth is not field-adjustable.

Should access to the chamber be necessary, refer to the exploded diagram, in the back of this manual, to identify replacement parts.

To install and ready the burner for firing, follow the steps below for both furnace models.

1.With electrical power connected to the furnace, turn off all electrical power to unit.

2.Remove the front lower access panel.

3.Mount the burner to the furnace. Install the flange gasket over the mounting studs and secure the burner flange to the furnace using hex head machine screw nuts, provided in the Parts Kit.

4.Connect the red and white wires from the burner harness to the black, red and white burner power leads found underneath the primary control. Then connect the two yellow wires to the “T & T” terminals on the front of the primary control.

For the oil burner installation (OMD) only:

5.Determine whether an oil return line is required and connect the fuel oil piping to the burner oil pump through the base of the unit.

6.Turn on electrical power to the furnace. Cause or simulate a “call for heat” to bleed air from the oil line at the oil pump. (Temporarily, connect the two thermostat leads to cause the oil pump to run.)

7.With all oil shutoff valves open, open the air-bleed valve on the oil pump and capture the oil flow in a container until all traces of air in the line are gone.

8.Close the air-bleed valve. Check for and correct any oil leaks. The furnace is now ready for burner adjustment. Refer to the following “BURNER OPERATION AND ADJUSTMENT” section.

For the gas burner installation (GMD) only:

5.Connect the gas piping to the burner through the base of the unit.

6.With all gas shutoff valves open, bleed air from the gas line by opening the pipe union closest to the furnace a small amount. Carefully, close the pipe union when the odor of gas becomes strong. Check for and correct any subsequent gas leaks.

Wait five (5) minutes for any lingering gas to dissipate. 7. Turn on electrical power to the 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 SECTION TABLE OF CONTENTSBEGINNING PAGE a. Combustible material MODELS OMD/GMD b.Non-combustiblematerialMODEL III. FURNACE SPECIFICATIONSGMD-85 BLOWER DATA BURNER DATAB. STANDARD CHIMNEY IV. INSTALLATION A. ROOF JACKC.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 MAINTENANCEOMD/GMD TROUBLESHOOTING FLOWCHART Note: Check diagnostic code through view portprior 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 LOCATIONSINSTALLATION / SERVICE D.FILTER LOCATION AND CLEANINGE. CONTACT INFORMATION APPENDIX A. REPLACEMENT PARTS LIST
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