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1.
Follow the lighting instructions to place the unit into
operation.
2.
Set the thermostat to initiate a heating demand.
3.
Allow the burners to fire for approximately 3 minutes.
4.
Adjust the thermostat to deactivate the heating
demand.
5.
Wait for the combustion air inducer to stop. Set the
thermostat to initiate a heating demand and again
allow the burners to fire for approximately 3 minutes.
6.
Adjust the thermostat to deactivate the heating demand
and wait for the combustion air inducer to stop. At this
point, the trap should be primed with sufficient water to
ensure proper condensate drain operation.
If you do not follow these instructions exactly, a fire
or explosion may result causing property damage,
personal injury or death.
Gas Valve Operation
See Figure 62
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. See Figure 62.
7.
Wait five 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.
8.
Move gas valve switch to ON. See Figure 62.
Figure 62. Gas Valve Shown in "ON' Position
Page 40 of 51
WARNING
9.
Replace the heating compartment 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 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.
5.
Replace the heating compartment 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 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 lockout? If the unit locks
out again, inspect the unit for blockages.
Heating Sequence of Operation
1. When thermostat calls for heat, combustion air inducer
starts.
2.
Combustion air pressure switch proves blower
operation. Switch is factory set and requires no
adjustment.
3.
After a 15 second pre-purge, the hot surface ignitor
energizes.
4.
After a 20 second ignitor warm-up period, the gas
valve solenoid opens. A 4-second "Trial for Ignition"
period begins.
5.
Gas is ignited, flame sensor proves the flame, and the
combustion process continues.
6.
If flame is not detected after first ignition trial, the
ignition control will repeat steps 3 and 4 four more
times before locking out the gas valve. The ignition
control will then automatically repeat steps 1 through
6 after 60 minutes. To interrupt the 60 minute lockout
period, move thermostat from "Heat" to "OFF" then
back to "Heat". Heating sequence then restarts at step
1.
Issue 1917
507271-02
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