DESA INTERNATIONAL
UNVENTED NATURAL GAS LOG HEATER
OPTIONAL POSITIONING OF THERMOSTAT SENSING BULB
FOR MASONRY AND FACTORY-BUILT METAL FIREPLACE
If your log set cycles to pilot, but the room temperature drops to a lower than ideal comfort level before the log set comes back on, you may want to reposition the thermo- stat sensing bulb.
The thermostat sensing bulb is located on the gas valve assembly. This location allows the thermostat to keep the room temperature at an ideal comfort level for most fireplace applications. For positioning the thermostat sensing bulb elsewhere, an
Tools needed: 5/16" hex driver or socket
1.Locate the gas valve assembly and ther- mostat sensing bulb (see Figure 30).
2.With 5/16" hex driver or socket, loosen the thermostat screw. Carefully slide the thermostat sensing bulb out of the retaining clamp (see Figure 32).
Note: Do not remove the screw. Make sure you tighten the screw after remov- ing the thermostat sensing bulb.
IMPORTANT: Do not force or bend the thermostat sensing bulb or capillary.
Gas Valve
Assembly
Thermostat
Sensing Bulb
Figure 30 - Location of Gas Valve Assembly and Thermostat Sensing Bulb
3.The thermostat sensing bulb may be located to the lower right front side of fireplace. Determine location of sens- ing bulb, but do not mount sensing bulb until step 5. If you have a masonry fire- place, see Figure 33 for location.
If you have a
If your fireplace has glass doors, posi- tion sensing bulb directly behind door gap on right bottom side (see Figure 35).
Figure 31 -
Capillary
Screw Thermostat
Sensing Bulb
Retaining
Clamp
Figure 32 - Removing Thermostat Sensing Bulb
Thermostat
Sensing
Bulb
Adhesive- backed Mounting Clip
Figure 33 - Locating Thermostat Sensing Bulb on Masonry Fireplace
4.The mounting clip must be a minimum of 3" from bottom of fireplace to pre- vent crimping of capillary. Once you have decided on a location, clean the area thoroughly. Remove the paper backing from the adhesive on back of mounting clip. Press the clip into the new location so that the thermostat sensing bulb will be positioned verti- cally with the capillary at the bottom (see Figure 36). Slide the thermostat sensing bulb into the clip.
IMPORTANT: Do not crimp capillary.
Thermostat
Sensing
Bulb
Adhesive- backed Mounting Clip
Figure 34 - Locating Thermostat Sensing Bulb on
Thermostat
Sensing
Bulb
Adhesive- backed Mounting Clip
Glass Doors
Figure 35 - Installing Thermostat Sensing Bulb behind Glass Doors
Thermostat
Sensing Bulb
Adhesive- backed
Capillary 
Mounting Clip
Do Not Crimp
Capillary
Figure 36 - Positioning the Thermostat Sensing Bulb in the Vertical Position with the Capillary at the Bottom
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