m
OPERATING
FURNACE
(Continued)
INSPECTING
BURNER
FLAME
_ TO TURN OFF GAS TO FURNACE
1. Set thermostat to lowest setting
2. Turn manual gas valve clockwise _ to OFF position. Do not force
manual gas valve.
3. Unplug furnace if service is to be performed.
To Shut Down Furnace for an Extended Period of Time
1. Tum manual gas valve clockwise _ to OFF position. Do not force
manual gas valve.
2. Set thermostat on OFF.
CAUTION
Do not try to adjust heating levels by using the manual shutoff
valve.
THERMOSTAT CONTROL OPERATION
The thermostat responds to the room temperature. When the room temperature
drops below the thermostat setting, the thermostat turns the furnace burner and
blower on. When the room temperature goes above the thermostat setting, the
thermostat turns the furnace burner off. The blower will continue to blow about two
to three minutes after the burner goes out. The thermostat keeps the room at a
constant temperature.
To observe burner flame, remove furnace front cover. Remove the two screws at
the lower edges of front cover. Lift front cover away. Locate viewing window on
front of combustion chamber. You can see burner flame through this window.
Correct Burner Flame: Blue flame with well-defined burner ports.
Incorrect Burner Flame: Yellow or lazy flame without well-defined burner ports.
If burner flame is incorrect, shut off furnace and contact a qualified service person.
0 0 0 0
Correct Rame Pattern Incorrect Flame Pattern
Figure 19. Burner Flame Patterns
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