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119426-01A

32

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).

Summary of Contents for VUL 18R, VUL24R, VUL30R, HR B3930, HR 3924R, CRB3624T, VUL 18T, VUL24T, VUL30T, HR B3624T

Page 1: ...atelycallyourgassupplierfromaneighbor s phone Follow the gas supplier s instructions If you cannot reach your gas supplier call the fire department Installation and service must be performed by a qual...

Page 2: ...e agency or the gas supplier WARNING This appliance is for installation only in a solid fuel burning mason ry or UL127 factory built fireplace or in alistedvent less firebox enclosure It is design cer...

Page 3: ...your guide to safe and proper operation of this fireplace WARNING Any change to this heater or its controls can be dangerous WARNING Do not use a blower insert heat exchanger insertorotheraccessoryno...

Page 4: ...burner box or on adjacent walls and furniture 10 This heater needs fresh outside air ventilation to run properly This heater has an Oxygen DepletionSensing ODS safetyshutoffsystem The ODS shuts down t...

Page 5: ...ater may also be operated as a vented decorative ANSI Z21 60 product by opening the flue damper Non Thermostat Models Only Safety Device This heater has a pilot with an Oxygen Deple tion Sensing ODS s...

Page 6: ...tion However in buildings of unusually tight construction you must provide additional fresh air Unusually tight construction is defined as construction where a walls and ceilings exposed to the out si...

Page 7: ...of Btu Hr used The space in the above example is a confined space because the actual Btu Hr used is more than the maxi mum Btu Hr the space can support You must provide additional fresh air Your optio...

Page 8: ...culatetheheatthroughoutthe house In the event of a power outage you can use this heater as your primary heat source WARNING A qualified ser vice person must install heater Follow all local codes NOTIC...

Page 9: ...ere you bought heater for proper type heater WARNING This appliance is equipped for natural or pro pane LP gas Field conversion is not permitted INSTALLATION AND CLEARANCES For Vent Free Operation WAR...

Page 10: ...f noncombustible material is more than 12 you may need the hood accessory to deflect heat away from your mantel shelf See Figure 5 and Figures 6 and 7 page 9 for minimum clearances IMPORTANT If you ca...

Page 11: ...el Clearances When Using Hood Minimum Non Combustible Material Minimum Non Combustible Material Height Distances to Underside of Mantel Top of Fireplace Opening Underside of Mantel Shelf 12 8 A 18 14...

Page 12: ...cluded with clamp accessory See chart below for minimum permanent flue opening you must provide Attach damper clamp so the minimum permanent flue opening will be maintained at all times Area of Variou...

Page 13: ...oved flexible gas hose to gas regulator of heater see Figure 11 For Remote Ready models connect approved flexible gas hose to inlet side of gas control see Figure 12 IMPOR TANT Hold gas regulator with...

Page 14: ...gas connector if allowed by local codes not provided ACSAdesign certified equipment shutoff valve with 1 8 NPT tap is an acceptable alternative to test gauge connection Purchase the optional CSA desi...

Page 15: ...sediment trap traps moisture and contaminants This keeps them from going into heater controls If sediment trap is not installed or is installed wrong heater may not run properly CAUTION Avoid damage t...

Page 16: ...k reconnected fittings for leaks Test Pressures Equal To or Less Than 1 2 PSIG 3 5 kPa 1 Close equipment shutoff valve see Figure 17 2 Pressurize supply piping system by either opening propane LP supp...

Page 17: ...o unit 2 Carefully remove logs and set aside 3 Locate mounting screws on sides of heater base assembly and remove screws Set screws aside for reinstallation 4 Disconnect gas line from heater base as s...

Page 18: ...ote Make sure excess wire does not inter fere with burner or pilot 10 If heater was removed from fireplace before installation of remote accessory see Install ing Heater Base Assembly on page 12 to re...

Page 19: ...ottom log in center of the base assem bly as shown in Figure 27 2 Rest rear log in back corner sections of base as semblyasshowninFigure27 Make sure log is completely vertical and not leaning in towar...

Page 20: ...iance and to replace any part of the control system and any gas control which has been under water LIGHTING INSTRUCTIONS WARNING If fireplace has glass doors never operate this heater with glass doors...

Page 21: ...level The burners should light Set control knob to any heat level between HI and LO CAUTION Do not try to ad just heating levels by using the equipment shutoff valve Operating Heater Continued Figure...

Page 22: ...page 23 WARNING Burners will come onautomaticallywithinoneminute when the selector switch is in the ON position after the pilot is lit Remote Ready Models FOR YOUR SAFETY READ BEFORE LIGHTING WARNING...

Page 23: ...t steps 4 through 8 page 22 and above 9 Slightly push in and turn control knob coun terclockwise to the ON position 10 Wait one minute and switch selector switch to theONpositiontolightburners Note AU...

Page 24: ...burner turns on Hold the control button again until burner turns off see Figure 34 To Lock press both buttons on hand held remote control until light stops flashing Hand held remote control is now loc...

Page 25: ...e receiver continuously receives signals from the hand held remote to control the room temperature If the hand held remote is misplaced obstructed or for any reason cannot transmit to the receiver the...

Page 26: ...by a qualified service person Heater may need more frequent cleaning due to excessive lint fromcarpeting pethair bedding material etc WARNING Failure to keep the primary air opening s of theburner s...

Page 27: ...mpressed air is not available Cleaning and Maintenance Continued LOGS If you remove logs for cleaning refer to Install ing Logs page 18 to properly replace logs Replace log s if broken or chipped dime...

Page 28: ...n PILOT position 4 Air in gas lines when installed 5 Depleted gas supply pro pane LP only 6 ODS pilot is clogged 7 Gas regulator setting is not correct REMEDY 1 Reconnect ignitor cable 2 Free ignitor...

Page 29: ...terlock system to reset Repeat ignition operation 4 Fully open equipment shutoff valve 5 A Contact local natural or propane LP gas company B Clean ODS pilot see Cleaning and Maintenance page 26 or re...

Page 30: ...line checked by local natural or propane LP gas company 3 Observe minimum installa tion clearances see pages 9 through 11 4 Clean burners see Cleaning and Maintenance page 26 or replace burner orific...

Page 31: ...r between con trol valve and burner 2 Gas leak See Warning statement at top of page 1 Thermostat sensing bulb needs to be repositioned Thermo stat Controlled Models Only 2 Hand held remote control is...

Page 32: ...t 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 S...

Page 33: ...s Pressure in of water Max 10 5 W C Min 5 W C VUL24PT VUL30Pt HRB3624PT Rating Variable 25 000 36 000 Btu Hr Type Gas Propane LP Ignition Electronic Manifold Pressure 7 9 W C Inlet Gas Pressure in of...

Page 34: ...Log 2 1 4 113621 04 113621 10 113621 16 Middle Left Log 2 1 5 113621 05 113621 11 113621 11 Bottom Log 3 Remote 1 113621 05 113621 19 113621 19 Bottom Log 3 T stat 6 113621 06 113621 12 113621 18 Rea...

Page 35: ...aceable parts used in your heater When ordering parts follow the instructions listed under Replacement Parts on page 42 of this manual 1 3 2 KEY NO PART NUMBER DESCRIPTION QTY CRB2618NR CRB2618PR HRB3...

Page 36: ...9426 01A 36 Illustrated Parts Breakdown Thermostat controlled Models VUL18NT VUL18PT VUL24NT VUL24PT VUL30NT VUL30PT HRB3624NT AND HRB3624PT LPG 11 10 4 1 8 3 12 8 2 5 6 7 24 25 21 2 23 22 15 13 16 9...

Page 37: ...rner Injector Propane LP 1 101004 15 1 12 101004 11 Front Burner Injector Natural 1 101004 10 Front Burner Injector Propane LP 1 101004 22 Front Burner Injector Natural 1 101004 06 Front Burner Inject...

Page 38: ...ch com 119426 01A 38 ILLUSTRATED PARTS BREAKDOWN Remote Ready Variable Control Models VUL18NR VUL18PR VUL24NR VUL24PR VUL30NR VUL30PR LPG 5 6 21 14 22 14 23 24 2 19 20 16 1 18 17 10 11 4 3 8 8 12 14 1...

Page 39: ...Injector Natural 1 101004 02 Rear Burner Injector Propane LP 1 12 101004 11 Front Burner Injector Natural 1 101004 10 Front Burner Injector Propane LP 1 101004 08 Front Burner Injector Natural 1 10100...

Page 40: ...40 ILLUSTRATED PARTS BREAKDOWN Remote Ready Variable Control Models CRB2618NR CRB2618PR CRB3624NR CRB3624PR CRB3630NR CRB3630PR HRB3624NR AND HRB3624PR LPG 5 6 21 14 22 14 23 24 2 19 20 16 1 18 17 10...

Page 41: ...Injector Propane LP 1 12 101004 11 Front Burner Injector Natural 1 101004 10 Front Burner Injector Propane LP 1 101004 08 Front Burner Injector Natural 1 101004 06 Front Burner Injector Propane LP 1...

Page 42: ...ts Technical Service Department at 1 866 672 6040 When calling DESA Heating Products have ready your name your address model and serial numbers of your heater how heater was malfunctioning type of gas...

Page 43: ...MATE FIREBOXES Not Shown Available in 32 36 and 42 models Circu lating fireboxes feature louvers and an optional blower Non circulating smooth face models are ideal for custom trim applications such a...

Page 44: ...talled by a qualified installer in accordance with all local codes and instructions furnished with the unit This warranty does not apply to parts that are not in original condition because of normal w...

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