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Thermostatic Control
The thermostat control knob can be set to any comfort
level between “HI” and “LO”. The thermostat will
gradually modulate the heat output and flame height
from higher to lower settings in order to maintain the
comfort level you select. The ideal comfort setting will
vary by household depending upon the amount of
space to be heated, the output of the central heating
system, etc.
NOTE: Selecting the “HI” setting with the control knob
will cause the burner to remain fully on, without modu-
lating down in most cases.
Positions of Thermostat Sensing Bulb
The thermostat sensing bulb can be found on the gas
valve assembly. Instructions follow for placement of this
bulb to achieve proper thermostatic operation.
1. Locate the gas valve assembly and thermostat
sensing bulb. (Fig. 8)
2. The thermostat sensing bulb has been placed in the
best location by the manufacturer.
NOTE: If the room temperature drops to a lower than
ideal comfort level even at the highest setting, you may
want to use some sort of mounting clip or bracket (not
provided) to reposition the thermostat sensing bulb in
the locations listed below.
FP1501
Fig. 8 Thermostat sensing bulb.
Determining Sensing Bulb Location
The thermostat sensing bulb can be attached to a new
position by mounting a bracket or mounting clip (not
provided) in the following locations and placing the
sensing bulb into this bracket.
1. The thermostat sensing bulb may be located to the
lower right front side of the fireplace. Determine
location of sensing bulb depending on which kind of
fireplace you have.
2. The best way to mount the sending bulb is to
position it vertically with the capillary at the bottom.
NOTE: Do not crimp capillary.
3. If you have a masonry fireplace, refer to Figure 9.
4. If you have a factory built metal fireplace, refer to
Figure 10.
5. If your fireplace has glass doors, position sensing
bulb directly behind door gap on right bottom side.
(Fig. 11)
FP1502
Fig. 9 Sensing bulb in masonry fireplace.
Inner Fireplace Wall
Inner Fireplace Wall
FP1503
Fig. 10 Sensing bulb in prefabricated fireplace.
Inner Fireplace
Wall
Fireplace
Glass Door
FP1504
Fig. 11 Sensing bulb with glass doors installed.