Complete Installation - Whirlpool WFCT Installation Instructions Manual

90+ multipositional gas furnace

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Table of Contents

4. Be sure the gas control has been in the Off position for at

least 5 minutes before starting the furnace.

5. Move the gas control to the ON position.

NOTE: This furnace is equipped with an ignition device which

automatically lights the burner. This furnace cannot be lighted

manually. Do not try to light the burner by hand.

6. Turn on the electrical power to the furnace.

7. Set the room thermostat to a point above room temperature

to light the main burners.

8. Observe the pressure reading on the pressure gauge.

9. Refer to the Manifold Pressure vs. Altitude Chart for the

correct manifold pressure. If necessary, remove the regulator

adjusting burner box reference tap on the gas control valve

(has barbed fitting and hose on sealed combustion units) and

turn the regulator adjusting screw clockwise to increase

pressure and input, or counterclockwise to decrease pressure

and input.

IMPORTANT: If the manifold pressure cannot be adjusted to

the correct value, contact your gas supplier.

10. Move the gas control to the OFF position.

11. Disconnect the pressure gauge from the ¹⁄₈" (3.2 mm) NPT

outlet pressure tap.

12. Replace outlet pressure tap plug and the regulator adjusting

burner box reference tap (has barbed fitting and hose on

sealed combustion units) on the gas control valve.

13. Move the gas control to the ON position.

14. Replace the burner access door.

IMPORTANT: Do not use this furnace if any part has been under

water. Immediately call a qualified person to inspect the furnace

and to replace any part of the control system and gas control

which has been under water.

1. Be sure you have all of your tools.

2. Dispose of/recycle all packaging materials.

3. Check the furnace in its final location. Be sure the vent is not

blocked.

Measure Temperature Rise

1. Adjust the room thermostat to the highest temperature

setting possible.

2. After 20 minutes of heating operation, measure the furnace

temperature rise. Take air temperature readings in both the

return air ducts and the heated air ducts (about 6 ft from the

furnace where they will not be affected by radiant heat) as

shown.

NOTE: If more than one run of return or heated air ducts is

used, air temperature measurements should be taken in each

duct. These measurements can be converted to an average

to obtain the temperature rise of the whole system.

15. Set the room thermostat to the desired temperature

necessary to achieve optimum temperature rise.

Manifold Pressure vs. Altitude Chart for Natural Gas

Altitude—ft (m)

2,000 (609.6)

3,000 (914.4)

4,000 (1,219.2)

4,500 (1,371.6)

5,000 (1,524)

5,500 (1,676.4)

6,000 (1,828.8)

6,500 (1,981.2)

7,000 (2,133.6)

7,500 (2,286)

For Altitudes 7,500 to 10,000 ft (2,286 m to 3,048 m)

Above Sea Level

Do not adjust manifold pressure. An orifice change is required.

For the correct orifice size, see Table F.4 in Appendix F of the

National Fuel Gas Code (ANSI Z223.1/NFPA 54, latest edition).