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DESA INTERNATIONAL

UNVENTED (VENT-FREE)

NATURAL GAS LOG HEATER

Manually Control Models Also Designed Certified as Vented Decorative Appliance)

This appliance may be installed in an aftermarket* manufactured (mobile) home,

where not prohibited by state or local codes.

* Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer

OWNER’S OPERATION AND INSTALLATION MANUAL

Save this manual for future reference.

WARNING: If the information in this manual is
not followed exactly, a fire or explosion may
result causing property damage, personal
injury, or loss of life.

— Do not store or use gasoline or other
flammable vapors and liquids in the vicinity
of this or any other appliance.

— WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.
• Do not touch any electrical switch; do

not use any phone in your building.

• Immediately call your gas supplier from

a neighbor’s phone. Follow the gas
supplier’s instructions.

• If you cannot reach your gas supplier,

call the fire department.

— Installation and service must be per-

formed by a qualified installer, service
agency, or the gas supplier.

WARNING: Improper installation, adjustment,
alteration, service, or maintenance can cause
injury or property damage. Refer to this
manual for correct installation and opera-
tional procedures. For assistance or addi-
tional information consult a qualified installer,
service agency, or the gas supplier.

WARNING: This gas log set is for installa-
tion in a masonry solid fuel burning fire-
place, a U.L. listed manufactured solid fuel
burning fireplace or an AGA design certi-
fied vent-free firebox (including LogMate
FB32C and FB32NC) listed for use with
these gas log models.

WARNING: This is an unvented gas-fired
heater. It uses air (oxygen) from the room in
which it is installed. Provisions for adequate
combustion and ventilation air must be
provided. Refer to “Air for Combustion and
Ventilation” section in this manual.

®

LO

PILOT

OFF

HI

LO

PILOT

OFF

HI

18" (Non “A” Model), 24", 30"

(“A” Models) Variable Manually-Controlled,

and (“A” Models) Thermostatically-Controlled

SPLIT OAK DESIGN

STANDARD OAK DESIGN

18", 24", and 30"

(“A” Models) Thermostatically-Controlled

Summary of Contents for VS18NTA

Page 1: ...upplier call the fire department Installation and service must be per formed by a qualified installer service agency or the gas supplier WARNING Improperinstallation adjustment alteration service orma...

Page 2: ...agent is added to the gas The odor helpsyoudetectagasleak However theodoraddedtothegascanfade Gasmaybepresent even though no odor exists Make certain you read and understand all Warnings Keep this ma...

Page 3: ...heater and call a qualified service person Note During initial operation slight smoking may occur due to log curing and heater burning manufacturing residues 9 Do not allow fans to blow directly into...

Page 4: ...ar Log Base Assembly Front Burner Piezo Ignitor Rear Burner Crossover Log Top Middle Log Bottom Middle Log Figure 2 Standard Oak Design Model Control Knob Right Front Branch Base Assembly Front Log Re...

Page 5: ...er base assembly from carton Note Do not pick up heater base assembly by burners This could damage heater Always handle base assembly by grate 2 Remove all protective packaging applied to logs and hea...

Page 6: ...ts around window and door frames between sole plates and floors between wall ceiling joints between wall panels at penetrations for plumbing electrical and gas lines and at other openings If your home...

Page 7: ...heater ___________________ Btu Hr Gas fireplace logs ___________________ Btu Hr Other gas appliances ___________________ Btu Hr Total ___________________ Btu Hr Example Gas water heater 40 000 Btu Hr...

Page 8: ...of ventilation grills or ducts WARNING ICON G 001 WARNING Rework worksheet adding the space of the adjoining unconfined space The combined spaces must have enough fresh air to supply all appliances in...

Page 9: ...ing or other flammable objects are less than 36 inches from the front top or sides of the heater in high traffic areas in windy or drafty areas WARNING ICON G 001 CAUTION This heater creates warm air...

Page 10: ...efully follow the instructions below This will ensure safe installation into a masonry or U L listed manufactured fireplace Minimum Wall and Ceiling Clearances see Figure 5 A Clearances from the side...

Page 11: ...aterial must extend at least 8 up for all models If non combus tible material is less than 12 you must install the fireplace hood accessory 24 and 30 models only See chart below and Figure 5 for minim...

Page 12: ...ion page 14 Figure 7 Minimum Mantel Clearances Without Using Hood Minimum Non Combustible Material Minimum Non Combustible Material Height Distances to Underside of Mantel Top of Fireplace Opening Und...

Page 13: ...oring see Figure 10 Hearth 5 Min Combustible Material Figure 10 Minimum Fireplace Clearances Above Combustible Flooring If your installation does not meet the above minimum clearances you must operate...

Page 14: ...number 1 or 2 above apply to you you must permanently open chimney flue damper You must install the damper clamp accessory to order see Accessories page 35 This will insure vented operation see Figur...

Page 15: ...stallation Items Needed hardware package provided with heater approved flexible gas hose not provided if allowed by local codes sealant resistant to LP gas not provided electric drill with 3 16 drill...

Page 16: ...NG Continued Heater Gas Regulator Flexible Gas Hose if allowed by local codes Figure 12 Attaching Flexible Gas Hose to Heater Gas Regulator Mounting Bracket Masonry Screw Figure 13 Attaching Mounting...

Page 17: ...If pipe is too small undue loss of pressure will occur Installation must include a manual shutoff valve union and plugged 1 8 NPT tap Locate NPT tap within reach for test gauge hook up NPT tap must be...

Page 18: ...joints Bubbles forming show a leak Correct all leaks at once WARNING ICON G 001 WARNING Test all gas piping and connections for leaks after installing or servicing Correct all leaks at once CHECKING...

Page 19: ...nob of heater is in the OFF position 4 Check all joints from manual shutoff valve to thermostat gas valve thermo stat controlled models or control valve manually controlled models see Figure 16 Apply...

Page 20: ...see Figure 17 2 Slide front log 2 into place behind front burner Make sure tabs at bottom of log are behind front burner see Figure 18 3 Place crossover log 3 into place see Figure 19 Be sure to plac...

Page 21: ...ar Note 18 model has only one front log 2 Rest bottom middle log 2 behind metal posts on front burner Make sure the grooves in the bottom of the log fit over the grate Bring the log forward next to th...

Page 22: ...all around the appliance area for gas Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor WHAT TO DO IF YOU SMELL GAS Do not try to light any appliance...

Page 23: ...After 30 seconds release control knob If control knob does not pop out when released contact a qualified service person or gas supplier for repairs Note If pilot goes out repeat steps 3 through 7 Thi...

Page 24: ...ease control knob Now follow step 8 above Thermocouple Figure 27 Pilot Ignitor Electrode Pilot Burner 8 Turn control knob counterclockwise C clockwise to desired heating level The burners should light...

Page 25: ...ents at the bottom you must open the vents before operating heater You must operate this heater with a fireplace screen in place Make sure fireplace screen is closed before running heater 1 STOP Read...

Page 26: ...his results in increased heating comfort 7 Keep control knob pressed in for 30 seconds after lighting pilot After 30 seconds release control knob If control knob does not pop out when released contact...

Page 27: ...urner flame pattern Figure 33 shows incorrect front burner flame pattern The incorrect burner flame pattern shows yellow tipping at top of blue flame If front burner flame pattern is incorrect as show...

Page 28: ...or similar object to clean ODS pilot This can damage ODS pilot unit POSSIBLE CAUSE 1 Ignitor electrode not con nected to ignitor cable 2 Ignitor cable pinched or wet 3 Piezo ignitor nut is loose 4 Bro...

Page 29: ...more 7 Replace thermocouple 8 Replace control valve OBSERVED PROBLEM When ignitor button is pressed there is spark at ODS pilot but no ignition ODS pilot lights but flame goes out when control knob is...

Page 30: ...Problem will stop after a few hours of operation 1 Turn control knob to LO position and let warm up for a minute 2 Operate burners until air is removed from line Have gas line checked by local natural...

Page 31: ...l valve defective 1 Foreign matter between control valve and burner 2 Gas leak See Warning statement at top of page 1 Thermostat sensing bulb needs to be repositioned OBSERVED PROBLEM Heater produces...

Page 32: ...t Sensing Bulb 1 Locate the gas valve assembly and thermostat sensing bulb see Figure 34 2 The adhesive backed mounting clip see Figure 35 is attached to the thermostat sensing bulb Remove the adhesiv...

Page 33: ...ve backed Mounting Clip Glass Doors Figure 39 Installing Thermostat Sensing Bulb behind Glass Doors Thermostat Sensing Bulb Capillary Thermostat Sensing Bulb Do Not Crimp Capillary Adhesive backed Mou...

Page 34: ...SPECIFICATIONS 18 Variable 24 Variable 30 Variable Manually Manually Manually Controlled Controlled Controlled Btu Variable 16 000 26 000 20 000 33 000 21 500 36 000 Type Gas Natural Gas Only Natural...

Page 35: ...t 1 800 972 7879 for referral information When calling DESA International have ready model number of your heater the replacement part number REPLACEMENT PARTS ACCESSORIES Purchase these heater accesso...

Page 36: ...RATED PARTS BREAK DOWN Variable Manually Controlled Models 18 20 19 26 25 21 21 27 28 6 7 8 29 29 25 10 9 11 12 13 15 22 23 27 1 27 2 24 7 1 7 2 14 16 17 4 5 3 2 1L 1R VS18NV CFS18NV VS24NVA CFS24NVA...

Page 37: ...8867 09 098867 09 Gas Regulator 1 13 M11084 38 M11084 38 M11084 38 Screw 2 14 101011 01 101011 02 101011 03 Inlet Tube 1 15 098354 01 098354 01 098354 01 Control Knob 1 16 098462 03 098462 03 098462 0...

Page 38: ...TRATED PARTS BREAK DOWN Thermostat Controlled Models 31 6 25 6 7 8 9 10 11 8 8 29 13 12 13 14 15 16 18 17 19 24 26 27 7 1 7 2 29 22 23 21 28 20 30 3 1 2 4 5 10 1 10 2 VL18NTA CF18NTA VL24NTA CF24NTA V...

Page 39: ...ecals 1 13 098271 07 098271 06 098271 06 Ignitor Cable 1 14 102445 01 102445 01 102445 01 Piezo Ignitor 1 15 098867 09 098867 09 098867 09 Gas Regulator 1 16 M11084 38 M11084 38 M11084 38 Screw 2 17 1...

Page 40: ...TED PARTS BREAK DOWN Thermostat Controlled Models 31 6 25 6 7 8 9 10 11 8 8 29 13 12 13 14 15 16 18 17 19 24 26 27 7 1 7 2 29 22 23 21 28 20 30 10 1 10 2 4 5 3 2 1R 1L VS18NTA CFS18NTA VS24NTA CFS24NT...

Page 41: ...Base Assembly with decals 1 13 098271 07 098271 06 098271 06 Ignitor Cable 1 14 097159 02 097159 02 097159 02 Piezo Ignitor 1 15 098867 09 098867 09 098867 09 Gas Regulator 1 16 M11084 38 M11084 38 M1...

Page 42: ...___________________________________ _________________________________________________________________ _________________________________________________________________ ________________________________...

Page 43: ...___________________________________ _________________________________________________________________ _________________________________________________________________ ________________________________...

Page 44: ...and all such other costs related to repairing a defective heater will be the responsibility of the owner TOTHEFULLEXTENTALLOWEDBYTHELAWOFTHEJURISDICTIONTHATGOVERNSTHESALEOFTHE PRODUCT THIS EXPRESS WAR...

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