Thermo Products omd-70 service manual Electrical Branch Supply Circuit

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1.Electrical Branch Supply Circuit

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

: When testing electrical equipment, always follow standard electrical procedures and precautions.

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. Electrical Branch Supply Circuit provisions of the Canadian Electrical Code Part 1 shall be observed and followed where applicable.

2.Connection Of Power Supply Wires

a.Remove the furnace control panel cover.

b.Insert 120 VAC wires through the strain relief bushing (or conduit connection as applicable) on the left side of the furnace junction box.

c.Connect the “Hot” wire to the black wire marked “L1”.

d.Connect the “Neutral” wire to the white wire marked “L2”.

e.Connect the “ground” wire to the ground lug.

3.Connection Of Thermostat Wires

NOTE: Class 1 thermostat wire must be used inside the furnace burner compartment.

a.Insert 24 VAC wires through the plastic grommet on the left side of the furnace casing.

b.Connect the thermostat wires to “R” and “W” for heating.

c.Connect the thermostat wires to the room thermostat.

IMPORTANT: The room thermostat should be installed 4 to 5 feet above the floor on interior wall which is relatively free from direct sources of heat (sunlight or supply airflow) or exposure to cold (drafts from open windows and doors). The nominal anticipator settings are 0.8 amperes, for the GMD, and 0.2 amperes, for the OMD (refer to the thermostat literature for additional information).

Five-conductor thermostat wire is recommended for 24 VAC, low-voltage, control circuit wiring. Only 2 wires are required for the furnace (a heating application only).

Electrical Wire Diameter

(AWG)

24

22

20

18

Maximum Recommended Thermostat Wire Length

(feet)

55

90

140

225

24

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Contents FOR YOUR SAFETY MODEL: OMD-70 INSTALLATION AND SERVICE MANUALGAS-FIREDOR OIL-FIREDFURNACE DOWN FLOW & DIRECT VENT SEALED COMBUSTIONI. 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 Combustible Floor Base Model: 70-BASE D. BASE INSTALLATIONCottage Base Model: 01COT-BASE Figure 1A1. 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