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Page 2 - Electrostatic discharge can affect electronic; UNIT SIZE; Fig. 1—Dimensional Drawing

ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS PROCEDURE CAUTION: Electrostatic discharge can affect electronic components. Take precautions during furnace installationand servicing to protect the furnace electronic control.Precautions will prevent electrostatic discharges frompersonnel and hand tools wh...

Page 4 - INPUT BTUH

CAUTION: Air for combustion must not be contami- nated by halogen compounds, which include fluoride,chloride, bromide, and iodide. These elements are foundin aerosol sprays, detergents, bleaches, cleaning solvents,salts, air fresheners, and other household products. All fuel-burning equipment must b...

Page 5 - CONFINED; Fig. 4—Side Filter Arrangement

c. When ducts are used, they must be of the same cross- sectional area as the free area of the openings to whichthey connect. The minimum dimension of rectangularducts must not be less than 3 in. (See Fig. 3.) WARNING: Do not install the furnace on its back; safety control operation will be adversel...

Page 6 - GAS PIPING; If a flexible connector is required or al-; Fig. 5—Bottom Filter Arrangement

4. Adjust outside nut to provide desired height, and tighten inside nut to secure arrangement. V. GAS PIPING Gas piping must be installed in accordance with national and localcodes. Refer to the current edition of the NFGC. Canadianinstallations must be installed in accordance with NSCNGPIC andall a...

Page 7 - GAS

WARNING: Use the proper length of pipes to avoid stress on the gas control manifold. Failure to follow thiswarning can result in a gas leak, causing fire, explosion,personal injury, or death. CAUTION: Connect the gas pipe to the furnace using a backup wrench to avoid damaging gas controls. WARNING: ...

Page 8 - This furnace is equipped with a manual; Sequence of Operation; Furnace control must be grounded for; TABLE 5—ELECTRICAL DATA

The furnace must have a 115-v power supply properly connectedand grounded. Proper polarity must be maintained for correctoperation. Thermostat wire connections at R, W, C, and Y must bemade at the 24-v terminal block on the control board. The gasservice pressure must not exceed 0.5 psig (14-in. wc),...

Page 9 - Com; Fig. 10—EAC Terminals on Control Board

1. Heating mode When the wall thermostat "calls for heat," the R-W circuitcloses. The furnace control performs a self-check, verifiesthe pressure switch contacts are open, and starts inducermotor.a. Prepurge period—As the inducer motor comes up to speed, the pressure switch contacts close to...

Page 10 - PCB

→ Fig. 11—Unit Wiring Diagram A95335 PCB BL OWER O FF DE LAY SE LEC T IO N CH AR T 90 SEC 135 SEC 180 SEC 225 SEC GVR H I/L O RE L A Y SE C- 1 SE C- 2 PL 1 3 2 1 6 5 4 9 87 LE D TEST/TWIN BL OWER OF F DE LAY G R Y W C HU M HS IR ID R B L W R BL OWER SP EED SE LEC T FU 1 C OOL HE AT L2 PL 3 PL 2 VA C...

Page 11 - Adjustments

unit and the combined R-Y and R-G circuits start thefurnace blower motor on cooling speed. The EAC-1 termi-nal is energized with 115v when the blower is operating oncooling speed. When the thermostat is satisfied, R-G and R-Y circuits arebroken. The furnace blower and EAC continue operating oncoolin...

Page 13 - BURNER FLAME; TABLE 8—CANADIAN ORIFICE SIZE

(3.) When correct input is obtained, replace regulator seal cap. Main burner flame should be clear blue,almost transparent. (See Fig. 13.) d. High altitude—In the United States gas input on rating plate is for altitudes up to 2000 ft. Ratings for altitudesover 2000 ft must be 4 percent less for each...

Page 15 - SERVICE TRAINING; • Unit Familiarization

A94328 SERVICE TRAINING Packaged Service Training programs are an excellent way to increase your knowledge of the equipment discussed in this manual, including: • Unit Familiarization • Maintenance • Installation Overview • Operating Sequence A large selection of product, theory, and skills programs...