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ON
OFF
Demand
CAI
Ignitor
Gas Valve
Indoor Blower
Blower on time will be 45 seconds after gas valve is energized. Blower off time will depend on "OFF TIME" Setting.
Unit Start-Up
FOR YOUR SAFETY, READ BEFORE LIGHTING UNIT
Do not use this furnace if any part have been
underwater. Immediately call a licensed professional
service technician (or equivalent) to inspect the furnace
and to replace any part of the control system and any
gas control which has been underwater.
If overheating occurs or if gas supply fails to shut off,
shut off the manual gas valve to the appliance before
shutting off electrical supply.
Before
attempting
to
maintenance, turn the electrical power to unit OFF at
disconnect switch.
BEFORE LIGHTING smell all around the appliance 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 this unit will be equipped with a gas
control switch. Use only your hand to move the switch.
Never use tools. If the switch will not turn or if the control
switch will not move by hand, do not try to repair it.
Placing the Furnace into Operation
These units are equipped with an automatic ignition
system. Do not attempt to manually light burners on these
furnaces. 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 units with an automatic
ignition system.
507330-03G / 31-5000662
1
15
Ignitor Warm-up
Pre-Purge
Figure 34. Heating Sequence of Operation
WARNING
WARNING
CAUTION
perform
any
service
35
39
80
Blower
Trial for
"On" Delay
Ignition
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 35
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 switch on gas valve to OFF. Do not force. See
Figure 35.
7.
Wait five minutes to clear out any gas. If you then
smell gas, STOP! Immediately call your gas supplier
or
from a neighbor's phone. Follow the gas supplier's
instructions. If you do not smell gas go to next step.
Gas Valve Shown in "ON" Position
8.
Move switch on gas valve to ON. Do not force. See
Figure 35.
9.
Replace the upper access panel.
10. Turn on all electrical power to the unit.
Issue 2209
5 SEC
Post
Purge
WARNING
Figure 35.
Page 25 of 36
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