Desa VUL18 - Manual (Page 32)

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OPTIONAL POSITIONING
OF THERMOSTAT
SENSING bULb
(Thermostat-Controlled Models Only)
FOR MASONRY AND FACTORY-
BUILT METAL FIREPLACE
If your log set cycles to pilot, but the room tem-
perature drops to a lower than ideal comfort level
before the log set comes back on, you may want
to reposition the thermostat sensing bulb.
The thermostat sensing bulb is located on the gas
valve assembly. This location allows the ther-
mostat to keep the room temperature at an ideal
comfort level for most fireplace applications. For
positioning the thermostat sensing bulb elsewhere,
an adhesive-backed mounting clip is available
(see Figure 42).
Tools needed: 5/16" hex driver or socket
1. Locate the gas valve assembly and thermostat
sensing bulb (see Figure 43).
2. With 5/16” hex driver or socket, loosen the
thermostat screw. Carefully slide the thermo-
stat sensing bulb out of the retaining clamp
(see Figure 44).
Note: Do not remove the screw. Make sure
you tighten the screw after removing the
thermostat sensing bulb.
IMPORTANT: Do not force or bend the
thermostat sensing bulb or capillary.
Capillary
Screw
Retaining Clamp
Thermostat
Sensing Bulb
Figure 43 - Location of Gas Valve
Assembly and Thermostat Sensing Bulb
Thermostat
Sensing Bulb
Gas Valve
Assembly
Figure 42 - Adhesive-backed Mounting
Clip
Figure 44 - Removing Thermostat
Sensing Bulb
Figure 45 - Locating Thermostat Sensing
Bulb on Masonry Fireplace
Figure 46 - Locating Thermostat Sensing
Bulb on Factory-built Metal Fireplace
Adhesive-backed
Mounting Clip
Thermostat
Sensing Bulb
Figure 47 - Installing Thermostat Sensing
Bulb Behind Glass Doors
Adhesive-
backed
Mounting Clip
Glass Doors
Thermostat
Sensing Bulb
Adhesive-backed
Mounting Clip
Thermostat
Sensing Bulb
(Unit Will
Differ From
Illustration)
(Unit Will
Differ From
Illustration)
3. The thermostat sensing bulb may be located
to the lower right front side of fireplace. De-
termine location of sensing bulb, but do not
mount sensing bulb until step 4. If you have a
masonry fireplace, see Figure 45 for location.
If you have a factory-built metal fireplace, see
Figure 46 for location.
If your fireplace has glass doors, position
sensing bulb directly behind door gap on right
bottom side (see Figure 47).