1010352-UUM-N-0121
Johnson Controls Ducted Systems
3
1. Examine the heat exchanger, vent pipe, combustion air passages,
vent connectors, and chimney to be sure they are clear and free of
obstructions.
2. Examine the vent pipe, making sure it is firmly in place, slopes
slightly upward, and is physically sound without holes. Ensure all of
the connections are secure.
3. Examine the return-air duct connections to ensure they are physi-
cally sound, sealed to the furnace casing, and terminate outside the
space containing the furnace.
4. Examine the furnace casing, making sure the physical support is
sound without sagging, cracks, or gaps. Examine the furnace base,
making sure it is physically sound without sagging, cracks, or gaps,
and has a good seal.
5. Examine the furnace casing for obvious signs of deterioration.
6. Examine the burner flames to make sure they are in good adjust-
ment. See Figure 7 as a comparison to the actual flame.
7. Examine and replace the external air filters as needed to make sure
they are not blocked and proper airflow is provided to the furnace.
8. Examine any installed accessories or system components such as
evaporator coils to insure proper operation, drainage of conden-
sate, and that there is no water leakage or damage to the furnace
or any components.
SECTION III: START-UP AND SHUTDOWN
Read the instructions below before trying to start the furnace.
How your gas furnace works
Your furnace is a very easy appliance to take for granted. Season after
season, it sits there in your home, keeping you warm and comfortable.
For this reason, you may never have given much thought to the way
your furnace operates. In order to get the safest and most efficient oper-
ation from your furnace, you should understand how your furnace does
its job.
When you set your thermostat to provide more heat in your home, you
are starting the heating cycle of the furnace. First, the inducer motor
starts to purge the heat exchanger of any remaining gases. Next, the
hot surface ignitor glows and after a warm-up period, the gas valve
opens and ignition occurs. A short time later, the blower starts and dis-
tributes the warm air throughout the home. When the temperature set-
ting on your thermostat is reached, the gas valve closes, the main
burners are turned off, and the blower continues to run until the remain-
ing warm air in the system is distributed. When the blower stops, the
heating cycle has ended.
• This appliance does not have a pilot. It is equipped with an igni-
tion device which automatically lights the burner.
Do not
try to
light the burner by hand.
•
Before operating,
smell all around the appliance area for gas.
Be sure to smell next to the floor because some gas is heavier
than air and settles on the floor.
• Use only your hand to push the gas control switch to the
on
posi-
tion. Never use tools. If the switch does not operate by hand, do
not try to repair it; call a qualified service technician. Force or
attempted repair may result in a fire or explosion.
• Do not use this appliance if any part has been under water.
Immediately call a qualified service technician to inspect the
appliance and to replace any part of the control system and any
gas control which has been under water.
Figure 5:
Component Location - 80% Ultra Low NOx Models
Figure 6:
Component Location - 95% Ultra Low NOx Models
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Figure 7:
Burner Flame Drawing (Upflow Configuration Shown)
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WARNING
If you do not follow these instructions exactly, a fire or explosion may
result causing property damage, personal injury, and/or loss of life.
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