Desa VN20BT, VN30BT, VP20BT, VP30BT User Manual

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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.
• 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 performed by a quali-
fied installer, service agency or the gas supplier.
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WARNING: Improper installation, adjustment, altera­tion, service or maintenance can cause injury or prop­erty damage. Refer to this manual for correct installation and operational procedures. For assistance or addi­tional information consult a qualified installer, service agency or the gas supplier.
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 on page 5 of this manual.
This appliance may be installed in an aftermarket,* per­manently located, manufactured (mobile) home, where not prohibited by local codes.
This appliance is only for use with the type of gas indi cated on the rating plate. This appliance is not convert­ible for use with other gases.
* Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer
State of Massachusetts: The installation must be made by a licensed plumber or gas fitter in the Commonwealth of Massachusetts.
Sellers of unvented propane or natural gas-fired supplemental room heaters shall provide to each purchaser a copy of 527 CMR 30 upon sale of the unit.
Vent-free gas products are prohibited for bedroom and bathroom installation in the Common wealth of Massachusetts.
Safety Information ............................................... 3
Local Codes ........................................................ 4
Unpacking ........................................................... 4
Product Information ............................................. 4
Product Features ................................................. 4
Air For Combustion and Ventilation .....................
Installation ........................................................... 7
Operating Heater ............................................... 14
Inspecting Heater .............................................. 15
Cleaning and Maintenance ................................ 16
Specifications .................................................... 17
Service Hints ..................................................... 17
Technical Service ..............................................
Service Publications .......................................... 17
Troubleshooting .................................................
Replacement Parts ............................................ 21
Accessories ....................................................... 21
Illustrated Parts Breakdown and Parts List ....... 22
Warranty Information ...........................
Back Cover


IMPORTANT: Read this owner’s manual carefully and completely be fore tr ying to assemb le, operate or service this heater. Improper use of this heater can cause serious injury or death from burns, fire, explosion, electrical shock and carbon monoxide poisoning.
DANGER: Carbon monoxide
poisoning may lead to death!
Carbon Monoxide Poisoning: Early signs of carbon
monoxide poisoning resemble the flu, with head aches, dizziness or nausea. If you have these signs, the heater may not be working properly. Get fresh air at once! Have heater serviced. Some people are more affected by carbon monoxide than others. These include pregnant women, people with heart or lung disease or anemia, those under the influence of alcohol and those at high altitudes.
Natu ra l and Prop ane/L P Gas: Natur al and
propane/LP gases are fuel gases. Fuel gases are odorless. An odor-making agent are added to fuel gases. The odor helps you detect a fuel gas leak. However, the odor added to fuel gas can fade. Fuel gas may be present even though no odor exists.
Make certain you read and understand all warn ings. Keep this manual for reference. It is your guide to safe and proper operation of this heater.
WARNING: Any change to this heater or its controls can be dangerous.
WARNING: Do not use a blower insert, heat exchanger insert or other accessory not ap­proved for use with this heater.
Due to high temperatures, the appliance should be located out of traffic and away from furniture and draperies.
Do not place clothing or other flammable material on or near the appliance. Never place any objects on the heater.
Surface of heater becomes very hot when running heater. Keep children and adults away from hot surface to avoid burns or clothing ignition. Heater will remain hot for a time after shut­down. Allow surface to cool before touching.
Carefully supervise young chil-
dren when they are in the same room with heater.
Make sure grill guard is in place before running heater.
Keep the appliance area clear and free from combustible ma­terials, gasoline and other flam­mable vapors and liquids.
1. This appliance is only for use with the type of gas indicated on the rating plate. This appliance is not convertible for use with other gases.
2. Do not place propane/LP supply tank(s) in side any structure. Locate propane/LP supply tank(s) outdoors (propane/LP models only).
3. If you smell gas
• shut off gas supply
• 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
neighborʼs phone. Follow the gas supplierʼs instructions
• if you cannot reach your gas supplier, call
the fire department
4. This heater shall not be installed in a bedroom or bathroom.
5. This heater needs fresh, outside air ventilation to run properly. This heater has an Oxygen Depletion Sensing (ODS) safety shutoff system. The ODS shuts down the heater if not enough fresh air is available. See Air for
Combustion and Ventilation,
page 5.
107886-01J 3
6. Keep all air openings in front and bottom of heater clear and free of debris. This will insure enough air for proper combustion.
7. If heater shuts off, do not relight until you provide fresh, outside air. If heater keeps shutting off, have it serviced.
8. Do not run heater
• where flammable liquids or vapors are used
or stored
• under dusty conditions
9. Do not use heater if any part has been under water. Immediately call a qualified service technician to inspect the room heater and to replace any part of the control system and any gas control which has been under water.
10. Turn off and let cool before servicing. Only a qualified service person should service and repair heater.
11. Operating heater above elevations of 4,500 feet could cause pilot outage.
12. To prevent performance problems, do not use propane/LP fuel tank of less than 100 lbs. capacity (propane/LP models only).
13. Prov ide adequa te clearance s around air openings.


Install and use heater with care. Follow all lo­cal codes. In the absence of local codes, use the latest edition of National Fuel Gas Code, ANSI Z223.1/NFPA 54*.
*Available from:
American National Standards Institute, Inc.
1430 Broadway
New York, NY 10018
National Fire Protection Association, Inc.
Batterymarch Park Quincy, MA 02269


Heater Cabinet
Front Panel
Figure 1 - Vent-Free Gas Heater
Ignitor Button
Glass Panel
Control Knob
Grill Guard


This heater has a pilot with an Oxygen Deple­tion Sensing (ODS) safety shutoff system. The ODS/pilot is a required feature for vent-free room heaters. The ODS/pilot shuts off the heater if there is not enough fresh air.
This heater has a piezo ignitor. This system re­quires no matches, batteries or other sources to light heater.
Thermostat models have a thermostat sensing bulb and a control valve. This results in the great est heater comfort. This can also result in lower gas bills.


1. Remove heater from carton.
2. Remove all protective packaging applied to heater for shipment.
3. Check heater for any shipping damage. If heater is damaged, promptly return to dealer where you bought heater.
WARNING: This heater shall not be installed in a confined space or unusually tight con­struction unless provisions are provided for adequate combus­tion and ventilation air. Read the following instructions to insure proper fresh air for this and other fuel-burning appliances in your home.
Todayʼs homes are built more energy efficient than ever. New materials, increased insulation and new construction methods help reduce heat loss in homes. Home owners weather strip and caulk around windows and doors to keep the cold air out and the warm air in. During heating months, home owners want their homes as airtight as possible.
While it is good to make your home energy effi cient, your home needs to breathe. Fresh air must enter your home. All fuel-burning appliances need fresh air for proper combustion and ventilation.
Exhaust fans, fireplaces, clothes dryers and fuel burning appliances draw air from the house to operate. You must provide adequate fresh air for these appliances. This will insure proper venting of vented fuel-burning appliances.
The following are excerpts from National Fuel Gas Code, ANSI Z223.1/NFPA 54, Section 5.3, Air for Combustion and Ventilation.
All spaces in homes fall into one of the three fol lowing ventilation classifications:
1. Unusually Tight Construction
2. Unconfined Space
3. Confined Space The information on pages 5 through 7 will help
you classify your space and provide adequate ventilation.
Unusually Tight Construction
The air that leaks around doors and windows may provide enough fresh air for combustion and ventilation. 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
side atmosphere have a continuous water vapor retarder with a rating of one perm (6x10 less with openings gasketed or sealed and
b. weather stripping has been added on
openable windows and doors and
c. caulking or sealants are applied to
areas such as joints 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 meets all of the three criteria above, you must provide additional fresh air. See Ventilation Air From Outdoors page 7.
If your home does not meet all of the three criteria above, proceed to Determining Fresh-
Air Flow For Heater Location, page 6.
Confined and Unconfined Space
The National Fuel Gas Code, ANSI Z223.1/NFPA 54 defines a confined space as a space whose
volume is less than 50 cubic feet per 1,000 Btu per hour (4.8 m rating of all appliances installed in that space and an unconfined space as a space whose volume is not less than 50 cubic feet per 1,000 Btu per hour
(4.8 m
per kw) of the aggregate input rating of all appliances installed in that space. Rooms com municating directly with the space in which the appliances are installed*, through openings not furnished with doors, are considered a part of the unconfined space.
­* Adjoining rooms are communicating only if there are doorless passageways or ventilation grills between them.
kg per pa-sec-m2) or
per kw) of the aggregate input
107886-01J 5
Determining if You Have a Confined or Unconfined Space
Use this work sheet to determine if you have a con­fined or unconfined space.
Space: Includes the room in which you will install heater plus any adjoining rooms with doorless pas­sageways or ventilation grills between the rooms.
1. Determine the volume of the space (length x width x height).
Length x Width x Height =__________cu. ft.
(volume of space)
Example: Space size 20 ft. (length) x 16 ft.
(width) x 8 ft. (ceiling height) = 2560 cu. ft. (volume of space)
If additional ventilation to adjoining room is
supplied with grills or openings, add the volume of these rooms to the total volume of the space.
2. Multiply the space volume by 20 to determine the maximum Btu/Hr the space can support.
_______ (volume of space) x 20 = (Maximum
Btu/Hr the space can support)
Example: 2560 cu. ft. (volume of space) x 20 =
51,200 (maximum Btu/Hr the space can support)
3. Add the Btu/Hr of all fuel burning appliances in the space.
Vent-free heater ______________ Gas water heater* ______________ Gas furnace ______________ Vented gas heater ______________ Gas fireplace logs ______________ Other gas appliances* + __________ Total = __________ * Do not include direct-vent gas appliances. Di
rect-vent draws combustion air from the outdoors and vents to the outdoors.
Example: Gas water heater ______________ Vent-free heater + _____________ Total = _____________
40,000 20,000 60,000
Btu/Hr Btu/Hr Btu/Hr Btu/Hr Btu/Hr Btu/Hr Btu/Hr
Btu/Hr Btu/Hr Btu/Hr
4. Compare the maximum Btu/Hr the space can support with the actual amount of Btu/Hr used.
_______________Btu/Hr (maximum the space can support) _______________Btu/Hr (actual amount of Btu/Hr used) Example: 51,200 Btu/Hr (maximum the space can support) 60,000 Btu/Hr (actual amount 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 options are as follows:
A. Rework worksheet, adding the space of an adjoin
ing room. If the extra space provides an unconfined space, remove door to adjoining room or add ventilation grills between rooms. See Ventilation Air From Inside Building, page 7.
B. Vent room directly to the outdoors. See Ventila
tion Air From Outdoors, page 7.
C. Install a lower Btu/Hr heater, if lower Btu/Hr size
makes room unconfined.
If the actual Btu/Hr used is less than the maximum Btu/Hr the space can support, fined space. You will need no additional fresh air ventilation.
the space is an uncon-
WARNING: If the area in which the heater may be oper ated is smaller than that defined as an unconfined space or if the building is of unusually tight construction, provide adequate combustion and ventilation air by one of the methods described in the National Fuel Gas Code, ANSI Z223.1/NFPA 54 Section 5.3 or applicable local codes.
Outlet Air
Inlet Air
Inlet Air
Crawl Space
To Attic
Remove Door into Adjoining
Option 3
Ventilation Grills
Into Adjoining Room,
into Adjoining
Option 1
Ventilation Air From Inside Building
This fresh air would come from an adjoining un confined space. When ventilating to an adjoining unconfined space, you must provide two perma­nent openings: one within 12” of the ceiling and one within 12” of the floor on the wall connecting the two spaces (see options 1 and 2, Figure 2). You can also remove door into adjoining room (see option 3, Figure 2). Follow the National Fuel Gas
Code, ANSI Z223.1/NFPA 54, Section 5.3, Air for Combustion and Ventilation for required size of
ventilation grills or ducts.
Ventilation Air From Outdoors
Provide extra fresh air by using ventilation grills or ducts. You must provide two permanent openings: one within 12” of the ceiling and one within 12” of the floor. Connect these items directly to the outdoors or spaces open to the outdoors. These spaces include attics and crawl spaces. Follow the
National Fuel Gas Code, ANSI Z223.1/NFPA 54, Section 5.3, Air for Combustion and Ventilation for
required size of ventilation grills or ducts. IMPORTANT: Do not provide openings for inlet
or outlet air into attic if attic has a thermostat­controlled power vent. Heated air entering the attic will activate the power vent.
Figure 3 - Ventilation Air from Outdoors


NOTICE: This heater is intended for use as supplemental heat. Use this heater along with your primary heating system. Do not install this heater as your pri mary heat source. If you have a central heating system, you may run system’s circulating blower while using heater. This will help circulate the heat throughout the house. In the event of a power outage, you can use this heater as your primary heat source.
WARNING: A qualified ser­vice person must install heater. Follow all local codes.
Use only the correct type of gas (natural or pro­pane/LP). If your gas supply is not the correct gas type, do not install heater. Call dealer where you bought heater for proper type heater.
WARNING: This appliance is equipped for (natural or pro pane/LP) gas. Field conversion
Figure 2 - Ventilation Air from Inside
107886-01J 7
is not permitted.
Minimum From Sides Of Heater
Minimum To Top Surface Of Carpeting, Tile Or Other Combustible Material
Left Side
Right Side
Before installing heater, make sure you have the items listed below.
• for propane/LP gas, external regulator (supplied by installer)
• piping (check local codes)
• sealant (resistant to propane/LP gas)
• equipment shutoff valve *
• ground joint union
• test gauge connection*
• sediment trap
• tee joint
• pipe wrench
* A CSA design-certified equipment shutoff valve with 1/8" NPT tap is an acceptable alternative to test gauge connection. The optional CSA design­certified equipment shutoff valve can be purchased from your dealer. See
WARNING: Maintain the minimum clearances shown in Figure 4. If you can, provide greater clearances from floor, ceiling and joining wall.
You can locate heater on the floor, away from a wall. A wall mounting bracket and floor base stand are included with this heater. Determine which method is best for your application.
Accessories, page 21.
WARNING: Never install the
• in a bedroom or bathroom
• in a recreational vehicle
• where curtains, furniture, clothing or other flammable objects are less than 36 inches from the front, top or sides of the heater
• as a fireplace insert
• in high traffic areas
• in windy or drafty areas
CAUTION: This heater cre­ates warm air currents. These currents move heat to wall sur­faces next to heater. Installing heater next to vinyl or cloth wall coverings or operating heater where impurities (such as, but not limited to, tobacco smoke, aromatic candles, cleaning flu­ids, oil or kerosene lamps, etc.) in the air exist, may discolor walls or cause odors.
IMPORTANT: Vent-free heaters add moisture to the air. Although this is beneficial, installing heater in rooms without enough ventilation air may cause mildew to form from too much moisture. See
for Combustion and Ventilation, page 5.
Figure 4 - Mounting Clearances As
Viewed From Front of Heater
CAUTION: If you install the heater in a home garage
• heater pilot and burner must be
at least 18 inches above floor
• locate heater where moving
vehicle will not hit it
For convenience and efficiency, install heater
• where there is easy access for operation, inspec tion and service
• in coldest part of room
An optional fan kit is available from your dealer. See Accessories, page 21. If planning to use fan, locate heater near an electrical outlet.
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