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6.
Move the gas valve switch to the OFF position. See
Figure 57.
7.
Wait five minutes to clear out any gas. If you then smell
gas, STOP! Leave the installation and Immediately
call the gas supplier from a neighbor's phone. Follow
the gas supplier's instructions. If you do not smell gas
go to the next step.
8.
Move gas valve switch to the ON position. See Figure
57. DO Not force.
9.
Replace the access panel.
10. Turn on all electrical power to the unit.
11. Set the thermostat to desired setting.
NOTE: When unit is initially started, steps 1 through
11 may need to be repeated to purge air from gas line.
12. If the Appliance will not operate, follow the instructions
"Turning Off Gas to Unit" and call the gas supplier.
Turning Off Gas to Unit
1.
Set the thermostat to the lowest settling.
2.
Turn OFF all electrical power to the unit if service is to
be performed.
3.
Remove the access panel.
4.
Move the gas valve switch to the OFF position.
5.
Replace the access panel.
Failure to Operate
If the unit fails to operate, check the following:
1.
Is the thermostat calling for heat?
2.
Are access panels securely in place?
3.
Is the main disconnect switch closed?
4.
Is there a blown fuse?
5.
Is the filter dirty or plugged? Dirty or plugged filters will
cause the limit control to shut the unit off.
6.
Is gas turned on at the meter?
7.
Is the manual main shut Off valve open?
8.
Is the gas valve turned on?
9.
Is the unit ignition system in lock out: If the unit locks
out again, inspect the unit for blockages.
10. Is blower harness connected to ignition control?
Furnace will not operate unless harness is connected.
Gas Pressure Measurement
Gas Flow (Approximate)
Furnace should operate at least 5 minutes before checking
gas flow. Determine time in seconds for two revolutions of
gas through the meter. (Two revolutions assures a more
accurate time.) Divide by two and compare to time in Table
26. If manifold pressure matches Table 30 and rate is
incorrect, check gas orifices for proper size and restriction.
Remove temporary gas meter if installed.
507029-05
NOTE: To obtain accurate reading, shut off all other gas
appliances connected to meter.
Unit
1 cu ft
Dial
070
55
090
41
110
33
Natural - 1000 btu/cu ft
Supply Pressure Measurement
A threaded plug on the inlet side of the gas valve provides
access to the supply pressure tap. Remove the threaded
plug, install a field provided barbed fitting and connect a
manometer to measure supply pressure. Replace the
threaded plug after measurements have been taken.
Manifold Pressure Measurement
To correctly measure manifold pressure, the differential
pressure between the positive gas manifold and the
negative burner box must be considered. Use pressure
test adapter kit (available as part 10L34) to assist in
measurement.
1.
Remove the threaded plug from the outlet side of the
gas valve and install a field provided barbed fitting.
Connect test gauge "+" connection to barbed fitting to
measure manifold pressure.
2.
Tee into the gas valve regulator vent hose and connect
test gauge "-" connection.
3.
Start unit on low heat (40% rate) and allow 5 minutes
for unit to reach steady state.
4.
While waiting for the unit to stabilize, notice the flame.
Flame should be stable and should not lift from burner.
Natural gas should burn blue.
5.
After allowing unit to stabilize for 5 minutes, record
manifold pressure and compare to value given in
Table 30.
6.
Repeat steps 3, 4 and 5 on HIGH HEAT.
NOTE: Shut unit off and remove manometer as soon as an
accurate reading has been obtained. Take care to remove
barbed fitting and replace threaded plug.
DO NOT attempt to make adjustments to the gas valve.
Issue 2241
Gas Meter Clocking Chart
Seconds for One Revolution
Natural
2 cu ft
1 cu ft
Dial
Dial
110
136
82
102
66
82
LP - 2500 btu/cu ft
Table 26.
CAUTION
LP
2 cu ft
Dial
272
204
164
Page 51 of 73
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