STARTUP AND OPERATIONAL CHECKOUT
Do not use this furnace as a construction heater.
Use of this furnace as a construction heater
exposes the furnace to abnormal conditions,
contaminated combustion air and the lack of air
filters. Failure to follow this warning can lead to
premature furnace failure and/or vent failure which
could result in a fire hazard and/or bodily harm.
The automatic gas valve controls the flow of gas to
the main burners. The ignition system control switch built
into the automatic valve body has 2 positions: "OFF" and
"ON" (Figure 13). To shut off gas manually:Rotate switch
from "ON" to "OFF" position. When in "OFF" position, the
main burners are extinguished.
This furnace is equipped with an automatic hot-
surface ignition control and does not require the manual
lighting for furnace operation.
Figure 13
GAS CONTROL DIAGRAM
Do not attempt to manually light the burners.
Failure to follow this warning can lead to electrical
shock that could result in bodily harm.
After the ductwork connections have been made, gas
piping and electrical wiring completed and the furnace
has been properly vented, the unit should be started and
adjusted for proper operation. Check off the following
steps as they are completed.
1. Be sure all electrical power is OFF.
2. Check all wiring using proper wiring diagram on
inside of the control box cover.
3. Turn ON the electrical power.
4. Set the gas control knob in the "ON" position.
5. Set the thermostat above room temperature.
6. The ignitor will spark and the main burner
will ignite.
Figure 14
TYPICAL FLAME APPEARANCE
(Main Burners)
7. Recheck for leaks in the manual shut off valve, gas
control valve and gas connections using a soap
solution.
Never use an open flame when testing for gas
leaks! Use of an open flame could lead to a fire or
explosion.
Many soaps used for leak testing are corrosive to
certain metals. Piping must be rinsed thoroughly
with clean water after leak check has been
completed.
Manifold Pressure Adjustment:
Turn OFF the gas and electrical before
preceeding! Remove the manifold pressure tap pipe
plug from the gas valve (Figure 13 outlet pressure tap)
and install a pressure tap and connect it to a manometer.
Turn on the gas and electrical supplies, then measure the
manifold pressure with the furnace in operation.
20541501 Issue 0240 Page 18 of 26
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