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Make Gas Connections; Check The Furnace Input Rate - Whirlpool WFCU Installation Instructions Manual

90+ gas furnace
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Make Gas Connections

IMPORTANT: This furnace requires conversion for use with
propane. To order the correct conversion kit, see "Accessories."
1. Install the field gas supply as shown.
2. Provide a sediment trap on the outside of the furnace.
3. Install a manual gas shutoff valve in the gas line, outside the
unit, 5 ft above the floor, or in accordance with any local
codes.
4. Install a test gauge connection with a ¹⁄₈ in. NPT plugged
tapping immediately upstream of the manual gas shutoff
valve as shown.
5. Connect the gas pipe to the furnace controls providing a
ground joint union as close to the controls as possible to
facilitate removal of controls and manifold.
Pipe-joint compounds suitable for use with natural and LP
gas must be used. Do not use Teflon
1
2
3
4
5
6 6
7
¹⁄₈
1.
in. NPT plugged tapping
2. Manual gas shutoff valve
3. Ground joint union
4. Tee
WARNING
FIRE OR EXPLOSION HAZARD
Failure to follow the safety warnings exactly could result
in serious injury, death or property damage.
Never test for gas leaks with an open flame. Use a
commercially available soap solution made specifically
for the detection of leaks to check all connections. A fire
or explosion may result causing property damage,
personal injury or loss of life.
6. Turn off the gas supply at the manual gas shutoff valve.
1. Closed valve
2. Open valve
®Teflon is a registered trademark of E.I. Dupont de Nemours and
Company.
®
tape.
5. Sediment trap
6. Cap
7. Gas control valve
(inside furnace)
7. Remove the inlet pressure tap plug on the gas control valve
and connect pressure gauge to the ¹⁄₈ in. NPT inlet
pressure tap.
8. Turn on the gas supply at the manual gas shutoff valve.
9. Observe the inlet pressure.
The minimum inlet gas supply pressure is 5 in. W.C. for
natural gas and 11 in. W.C. for propane gas.
The maximum inlet gas supply pressure is 10.5 in. W.C. for
natural gas and 13 in. W.C. for propane gas.
10. Turn off the gas supply at the manual gas shutoff valve.
IMPORTANT: If the inlet gas supply pressure is not within the
minimum and maximum range as shown on the rating plate,
contact your gas supplier.
11. Disconnect the pressure gauge from the ¹⁄₈ in. NPT inlet
pressure tap.
12. Replace the inlet pressure tap plug on the gas control valve.
13. Turn on the gas supply at the manual gas shutoff valve.
14. Test all connections by brushing on an approved non-
corrosive leak-detection solution. Bubbles will show a leak.
Correct any leak found.
At test pressures greater than ¹⁄₂ psig (3.5 kPa), the
furnace and the manual gas shutoff valve must be
disconnected from the gas supply piping system.
At test pressures less than or equal to ¹⁄₂ psig (3.5 kPa),
the furnace must be isolated from the gas supply piping
system by closing the manual gas shutoff valve.
15. Replace the burner access door.

Check the Furnace Input Rate

(if required)
IMPORTANT:
The furnace input rate must not exceed the input rating on
the furnace rating plate.
At altitudes from 2,000 to 7,500 ft the furnace input rate must
not exceed that on the rating plate multiplied by the Input
Factor in the Manifold Pressure vs. Altitude chart.
This furnace is equipped for rated input at manifold pressures
of 3.5 in. W.C. for natural gas and 10.0 in. W.C. for propane
gas.
1. For natural gas, check the furnace rate by observing the gas
meter, making sure all other gas appliances are turned off.
The test hand on the meter should be timed for at least one
revolution.
BTU/HR
= Cubic feet per Revolution x 3600 x Heating
INPUT
# Seconds per Revolution
2. The actual heating value of your gas can be obtained from
your local utility company.
Value
17

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