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Complete Installation - Whirlpool WFCU Installation Instructions Manual

90+ gas furnace
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Complete Installation

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. Check to be sure you have all of your tools.
2. Dispose of all packaging materials.
3. Check the furnace in its final location. Be sure the vent is not
blocked.
Measure Temperature Rise
1. 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.
Warm Air
1
Return Air
1. Measure return air here.
2. Measure supply temperature here.
2. If furnace doesn't maintain temperature rise within the range
shown on the furnace rating plate, adjust the blower speed.
Adjust Blower Speed
Disconnect power before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or electrical shock.
NOTE: See the Wiring Connection Diagram while performing the
following procedure.
1. Disconnect power.
2. For heating speed, check the temperature rise and make the
necessary adjustments to the blower speed tap. See Wiring
Diagram.
3. Reconnect power.
2
4. Recheck the temperature rise. Repeat the procedure as
necessary to achieve optimum temperature rise.
5. If the furnace does not begin to heat the room, see the
"Troubleshooting" section.
Shut Down the Furnace
1. Set the room thermostat to the lowest setting.
2. Disconnect power.
3. Remove burner access door.
4. Shut off the gas by moving the gas control switch to the OFF
position.
5. Replace the burner access door.
WARNING
Electrical Shock Hazard
19

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