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Gas Valve Operation
See Figure 34 and Figure 35
1.
STOP! Read the safety information at the beginning
of this section.
2.
Set the thermostat to the lowest setting.
3.
Turn OFF all electrical power to the unit.
4.
This furnace is equipped with an ignition device which
automatically lights the burners. Do not try to light the
burners by hand.
5.
Remove the heating compartment access panel.
6.
Move gas valve switch to OFF position. Do not force.
See Figure 34 and Figure 35.
7.
Wait five (5) minutes to clear out any gas. If you then
smell gas, STOP! Immediately call your gas supplier
from a neighbor's phone. Follow the gas supplier's
instructions. If you do not smell gas go to next step.
Shown in ON position.
Figure 34. White Rodgers Gas Valve
Shown in ON position.
Figure 35. Honeywell Gas Valve
8.
Move gas valve switch to ON position. Do not force.
See Figure 34 and Figure 35.
9.
Replace the heating compartment access panel.
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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 your service
technician or gas supplier.
Turning Off Gas to Unit
1. Set the thermostat to the lowest setting.
2.
Turn off all electrical power to the unit if service is to
be performed.
3.
Remove the heating compartment access panel.
4.
Move gas valve switch to OFF position. Do not force.
See Figure 34 and Figure 35.
5.
Replace the upper 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 or tripped circuit breaker?
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 internal manual shut-off valve open?
9.
Is the unit ignition system in lock out? If the unit locks
out again, call the service technician to inspect the unit
for blockages.
10. Is pressure switch closed? Obstructed flue will cause
unit to shut off at pressure switch. Check flue and
outlet for blockages.
11. Are flame rollout switches tripped? If flame rollout
switches are tripped, call the service technician for
inspection.
Gas Pressure Adjustment
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
13. If manifold pressure matches Table 15 and rate is
incorrect, check gas orifices for proper size and restriction.
Remove temporary gas meter if installed.
NOTE: Shut unit off and remove manometer as soon as an
accurate reading has been obtained. Take care to replace
pressure tap plug.
Issue 2302
507335-03
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