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Unit Start-Up
FOR YOUR SAFETY READ BEFORE OPERATING
Do not use this furnace if any part has been underwater.
A flood-damaged furnace is extremely dangerous.
Attempts to use the furnace can result in fire or explosion.
Immediately call a qualified service technician to inspect
the furnace and to replace all gas controls, control
system parts, and electrical parts that have been wet or
to replace the furnace, if deemed necessary.
Danger of explosion. Can cause injury or
product or property damage. Should the
gas supply fail to shut off or if overheating
occurs, shut off the gas valve to the
furnace before shutting off the electrical
blower deck, before performing any
service procedure.
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.
Capacity
Gas
Natural
All
Lp/
Propane
Page 54 of 60
WARNING
WARNING
CAUTION
perform
any
service
0 - 4500 ft.
4501 - 5500 ft.
Low
High
Low
Fire
Fire
Fire
1.7
3.5
1.6
4.5
10.0
4.2
Table 14. Manifold and Supply Line Pressure 0 - 10,000 ft.
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.
Gas Valve Operation
STOP! Read the safety information at the beginning
1.
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 upper access panel.
6.
Move gas valve switch to OFF. See Figure 77.
or
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 77.
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.
Manifold Pressure in w.g.
5501 - 6500ft.
High
Low
High
Fire
Fire
Fire
3.3
1.5
3.2
9.4
4.0
9.1
Issue 2332
Figure 77.
6501 - 7500ft.
7501-10000ft.
Low
High
Low
Fire
Fire
Fire
1.5
3.1
1.7
3.9
8.9
4.5
Supply Line
Pressure in
w.g.
0 - 10000 ft.
High
Min.
Max.
Fire
3.5
4.5
13.0
10.0
11.0
13.0
508404-01
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