GAS-FIRED OR OIL-FIRED FURNACE DOWN FLOW & DIRECT VENT (SEALED COMBUSTION) MODEL: OMD-70 INSTALLATION AND SERVICE MANUAL For installation in:
All installations and services must be performed by qualified service personnel. III. FURNACE SPECIFICATIONS MODEL OMD-70 GMD-85 HEAT INPUT R
All installations and services must be performed by qualified service personnel. BURNER DATA OMD
All installations and services must be performed by qualified service personnel. IV. INSTALLATION A. ROOF JACK The roof jack assembly and accessor
All installations and services must be performed by qualified service personnel. 4. This furnace is U.L. listed for closet, alcove or freestanding a
All installations and services must be performed by qualified service personnel. 1. Combustible Floor Base Model: 70-BASE Use the base bottom panel
All installations and services must be performed by qualified service personnel. If the combustion air passageway cannot terminate outside of the skir
All installations and services must be performed by qualified service personnel. IMPORTANT: Adequate combustion air must be provided under all circums
All installations and services must be performed by qualified service personnel. E. ALCOVE INSTALLATION In this application, a minimum of 18 inches
All installations and services must be performed by qualified service personnel. 2. The return air opening may be located in the top, the center or
All installations and services must be performed by qualified service personnel. The preferred location of the outside combustion air intake terminati
All installations and services must be performed by qualified service personnel. I. SAFETY SECTION This page and the following two pages contain var
All installations and services must be performed by qualified service personnel. Figure 6. 19
All installations and services must be performed by qualified service personnel. H. FUEL PIPING Sizing and installation of fuel lines must be in acc
All installations and services must be performed by qualified service personnel. : The furnace and its gas valve must be disconnected from the gas sup
All installations and services must be performed by qualified service personnel. If possible, install the tubing under the floor. Specific information
All installations and services must be performed by qualified service personnel. Figure 7. J. ELECTRICAL WIRING All electrical wiring must be inst
All installations and services must be performed by qualified service personnel. : When testing electrical equipment, always follow standard electrica
All installations and services must be performed by qualified service personnel. Once the furnace is installed, check the thermostat heat anticipato
All installations and services must be performed by qualified service personnel. “C” 24 VAC common from transformer “CC” Compressor Contactor
All installations and services must be performed by qualified service personnel. The control provides a 120 VAC output for an electronic air cleaner
All installations and services must be performed by qualified service personnel. DIP SWITCH 2 SECTION STATE BLOWER DELAY TIMES 1 2 3 4 ON - SEC O
All installations and services must be performed by qualified service personnel. : If you do not follow these instructions exactly, a fire or explosio
All installations and services must be performed by qualified service personnel. 5. WIRING DIAGRAM 29
All installations and services must be performed by qualified service personnel. K. BURNER INSTALLATION The burner mounts to the furnace on three mou
All installations and services must be performed by qualified service personnel. 8. The furnace is now ready for burner adjustment, refer to the foll
All installations and services must be performed by qualified service personnel. replacement parts for location identification). After the furnace is
All installations and services must be performed by qualified service personnel. range is between 70°F to 100°F. A lower temperature rise usually resu
All installations and services must be performed by qualified service personnel. V. DEALER MAINTENANCE THIS SECTION IS ONLY TO BE PERFORMED BY TRA
All installations and services must be performed by qualified service personnel. YesSet thermostat subbase to "HEAT"Does thermostat make con
All installations and services must be performed by qualified service personnel. 36 Is there combustionairflow to the furnace?YesYesYesYesIs there 12
All installations and services must be performed by qualified service personnel. 37 While ignition electrodesare sparking does fuel valve open?NoYesY
All installations and services must be performed by qualified service personnel. 38 After fuel valve opens,does the burner ignite?Check the fuel supp
All installations and services must be performed by qualified service personnel. : If you suspect there is a problem with the furnace, the venting sys
All installations and services must be performed by qualified service personnel. 39 Does the circulating airblower turn off afterthermostat is satisf
All installations and services must be performed by qualified service personnel. B. CAD CELL CHECKOUT PROCEDURE: (OMD ONLY) 1. Remove cad cell lea
All installations and services must be performed by qualified service personnel. 4. With access to the inside of the heat exchanger through the burne
All installations and services must be performed by qualified service personnel. Flue pipes should be inspected during the annual maintenance check-u
All installations and services must be performed by qualified service personnel. VI. USER INFORMATION SECTION A. WARNINGS AND CAUTIONS: : If
All installations and services must be performed by qualified service personnel. B. COMPONENT LOCATIONS The following diagram shows a typical furnace
All installations and services must be performed by qualified service personnel. 2. EXTERIOR OF FURNACES: The furnace exterior should be inspected fo
All installations and services must be performed by qualified service personnel. APPENDIX A. REPLACEMENT PARTS LIST 46
All installations and services must be performed by qualified service personnel. 47
All installations and services must be performed by qualified service personnel. This page and the following page contain reproductions of the various
All installations and services must be performed by qualified service personnel. 5 POWERSWITCH
All installations and services must be performed by qualified service personnel. TABLE OF CONTENTS SECTION BEGINNING PAGE I. SAFETY SECTION
All installations and services must be performed by qualified service personnel. II. GENERAL INSTRUCTIONS AND CLEARANCES NOTE: READ THIS SECTION BEF
All installations and services must be performed by qualified service personnel. b. Non-combustible material: “...material that is not capable of bein
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