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Before
attempting
to
maintenance, turn the electrical power to unit OFF at
disconnect switch.
BEFORE LIGHTING the unit, smell all around the furnace
area for gas. Be sure to smell next to the floor because
some gas is heavier than air and will settle on the floor.
The gas valve on the unit is equipped with a gas control
switch (lever). Use only your hand to move switch. Never
use tools. If the switch will not move by hand, do not try to
repair it. Force or attempted repair may result in a fire or
explosion.
Placing the Furnace into Operation
This furnace is equipped with an automatic hot surface
ignition system. Do not attempt to manually light burners
on this furnace. Each time the thermostat calls for heat, the
burners will automatically light. The ignitor does not get hot
when there is no call for heat on these units.
Priming Condensate Trap
The condensate trap should be primed with water prior
to start-up to ensure proper condensate drainage. Either
pour 10 fl. oz. (300 ml) of water into the trap, or follow
these steps to prime the trap:
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 67
1. STOP! Read the safety information at the beginning
of this section.
507768-05G / 31-5000655
CAUTION
perform
any
service
WARNING
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
or
automatically lights the burners. Do not try to light the
burners by hand.
5.
Remove the upper access panel.
6.
Move gas valve switch to OFF. See Figure 67.
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 67.
9.
Replace the upper 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 upper access panel.
4.
Move gas valve switch to OFF.
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 breaker?
Issue 2223
Figure 67.
Page 45 of 56
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