Desa VN3000C, VN2550IT, VN1800IT, VN1800C User Manual
®
VENT-FREE NATURAL GAS HEATER
OWNER’S OPERATION AND INSTALLATION MANUAL
Models: VN1800C, VN1800IT, VN3000C, and VN2550IT
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 performed by a qualified installer, service
agency, or the gas supplier.
®
Save this manual for future reference.
CONTENTS
SECTION PAGE
Safety Information......................................................................... 2
Product Identification .................................................................... 4
Local Codes ................................................................................... 4
Unpacking......................................................................................4
Product Features ............................................................................ 4
Fresh Air For Combustion And Ventilation .................................. 5
Installing To Wall.......................................................................... 9
Connecting To Gas Supply............................................................14
Checking Gas Connections............................................................15
Operating Heater (Models VN1800IT & VN2550IT)...................17
Operating Heater (Models VN1800C & VN3000C)..................... 21
Inspecting Burner .......................................................................... 24
Cleaning And Maintenance ........................................................... 26
Troubleshooting.............................................................................26
Technical Service .......................................................................... 30
Specifications ................................................................................ 30
Service Publications ...................................................................... 30
Service Hints ................................................................................. 30
Replacement Parts ......................................................................... 31
Accessories ....................................................................................31
Illustrated Parts Breakdown and Parts List ................................... 32-39
Warranty Information .................................................................... Back Cover
SAFETY
INFORMATION
WARNINGS
WARNING ICON G 001
IMPORTANT: Read this Owner’s Manual carefully and completely
before trying to assemble, 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
WARNING ICON G 001
Carbon monoxide poisoning may lead to death!
Carbon Monoxide Poisoning: Early signs of carbon monoxide poisoning
resemble the flu, with headaches, 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, persons with heart or lung disease or anemia, those under the
influence of alcohol, and those at high altitudes.
Natural Gas: Natural gas is odorless. An odor-making agent is added to natural gas.
The odor helps you detect a natural gas leak. However, the odor added to natural gas
can fade. Natural gas may be present even though no odor exists.
Make certain you read and understand all Warnings. Keep this manual for reference.
It is your guide to safe and proper operation of this heater.
2
Safety Information continues on next page
100750
SAFETY
WARNING ICON G 001
WARNINGS
Continued
INFORMATION
Continued
WARNING: Any change to this heater or its controls can be dangerous.
1. Use only natural gas. Do not convert heater to use different fuel type.
2. 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 neighbor’s phone. Follow the
gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire department
3. This heater shall not be installed in a bedroom or bathroom.
4. Never install the heater
• 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
5. Always run heater with plaque control knob at the 1, 2, 3, or 4 locked positions. Never set control knob between locked positions. Poor combustion and
higher levels of carbon monoxide may result.
6. This heater needs fresh, outside air ventilation to run properly. This heater
has an oxygen depletion sensor (ODS) pilot light safety system. The ODS
shuts down the heater if not enough fresh air is available. See Fresh Air for
Combustion and Ventilation, pages 5 through 8.
7. Never run heater in small, closed room. Open door into next room to help
ventilate.
8. If heater shuts off, do not relight until you provide fresh, outside air. If heater
keeps shutting off, have it serviced.
9. Do not run heater
• where flammable liquids or vapors are used or stored
• under dusty conditions
10.Never place any objects on the heater.
11.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 shut-down. Allow surface to cool before touching.
12.Carefully supervise young children when they are in same room with heater.
13.Make sure grill guard is in place before running heater.
14.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.
15.Turn off and unplug heater and let cool before servicing. Only a qualified
service person should service and repair heater.
16. Operating heater above elevations of 4,500 feet may cause pilot outage.
3
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PRODUCT
IDENTIFICATION
Thermostat Control Knob (Models VN1800IT and VN2550IT Only)
Piezo Ignitor (Models VN1800IT
and VN2550IT Only)
Front
Panel
Figure 1 - Vent-Free Natural Gas Heater (Model VN2550IT Shown)
Control Knob
Grill
Guard
Burners
Heater
Cabinet
LOCAL CODES
UNPACKING
PRODUCT
FEATURES
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, also known
as 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
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 inform
dealer where you bought heater.
Safety Device
This heater has a pilot with an Oxygen Depletion Sensor Shutoff System (ODS).
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.
Piezo Ignition System
This heater has a piezo ignitor. This system requires no matches, batteries, or other
sources to light heater.
Thermostatic Heat Control
(Models VN1800IT and VN2550IT Only)
This heater has a thermostat sensing bulb and thermostat control. This results in the
greatest heater comfort. This can also result in lower gas bills.
4
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FRESH AIR
WARNING
FOR
COMBUSTION
AND
VENTILA TION
This heater must have fresh air for proper operation. If not, poor
fuel combustion could result. Read the following instructions to
insure proper fresh air for this and other fuel-burning appliances
in your home.
Today’s 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 efficient, 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.
PRODUCING ADEQUATE VENTILATION
All spaces in homes fall into one of the three following ventilation classifications:
1. Unusually Tight Contruction; 2. Unconfined Space; 3. Confined Space.
The information on pages 5 through 8 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 outside atmosphere have a continu-
ous water vapor retarder with a rating of one perm or less with open-
ings gasketed or sealed
b. weather stripping has been added on openable windows and doors
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
If your home does not meet all of the three criteria above, continued reading.
Ventilation Air From Outdoors
and
, page 8
and
.
Unconfined Space
An unconfined space has a minimum air volume of 50 cubic feet for each 1000
BTU/Hr input rating of all appliances in the space (cubic feet equals length x
width x height of space). Include adjoining rooms only if there are doorless
passageways or ventilation grills between the rooms.
100750
Confined Space
A confined space has an air volume of less than 50 cubic feet for each 1000
BTU/Hr input rating of all appliances in the space (cubic feet equals length x
width x height of space). Include adjoining rooms only if there are doorless
passageways or ventilation grills between the rooms.
Continued
5
FRESH AIR
FOR
COMBUSTION
AND
VENTILA TION
Continued
DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION
Determining if You Have a Confined or Unconfined Space
Use this worksheet 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:
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. Divide the space volume by 50 cubic feet to determine the maximum BTU/Hr the space
can support.
____________ (volume of space) ÷ 50 cu. ft. = (Maximum BTU/Hr
the space can support)
Example:
BTU/Hr the space can support)
3. Add the BTU/Hr of all fuel burning appliances in the space.
Example:
* Do not include direct-vent gas appliances. Direct-vent draws combustion air from the
outdoors and vents to the outdoors.
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:
The space in the above example is a confined space because the actual BTU/Hr used is
more than the maximum 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 adjoining 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 Ventilation Air From Outdoors, page 8.
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, the
space is an unconfined space. You will need no additional fresh air ventilation.
Space size 20 ft. (length) x 16 ft. (width) x 8 ft. (ceiling height) =
2560 cu. ft. (volume of space)
2560 cu. ft. (volume of space) ÷ 50 cu. ft. = 51.2 or 51,200 (maximum
Vent-free heater ___________________ BTU/Hr
Gas water heater* ___________________ BTU/Hr
Gas furnace ___________________ BTU/Hr
Vented gas heater ___________________ BTU/Hr
Gas fireplace logs ___________________ BTU/Hr
Other gas appliances* + ___________________ BTU/Hr
Total = ___________________ BTU/Hr
Gas water heater 40,000 BTU/Hr
Vent-free heater + 18,000 BTU/Hr
Total = 58,000 BTU/Hr
51,200 BTU/Hr (maximum the space can support)
58,000 BTU/Hr (actual amount of BTU/Hr used)
WARNING
6
You must provide additional ventilation air in a confined space.
100750
FRESH AIR
FOR
COMBUSTION
AND
VENTILATION AIR
Ventilation Air From Inside Building
This fresh air would come from an adjoining unconfined 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).
VENTILA TION
Continued
WARNING
Rework worksheet, adding the space of the adjoining unconfined
space.
appliances in both spaces.
into Adjoining
The combined spaces must have enough fresh air to supply all
12"
Ventilation Grills
Ventilation
Grills
Room,
Option 1
Or
Remove
Door into
Adjoining
Room,
Option 3
Into Adjoining Room,
Option 2
100750
12"
Figure 2 - Ventilation Air from Inside Building
Continued
7
FRESH AIR
FOR
COMBUSTION
AND
VENTILA TION
Continued
VENTILATION AIR
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 NFPA 54/ANSI Z223.1, Section 5.3,
Air for Combustion and Ventilation for required size of ventilation grills or ducts.
IMPORTANT:
thermostat-controlled power vent. Heated air entering the attic will activate the power vent.
Do not provide openings for inlet or outlet air into attic if attic has a
(Continued)
Outlet
Air
Inlet
Air
Outlet
Air
Inlet Air
Figure 3 - Ventilation Air from Outdoors
Ventilated
Attic
Ventilated
Crawl Space
To Attic
To
Crawl
Space
8
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INSTALLING
TO WALL
NOTICE
A qualified service person must install heater. Follow all local codes.
CHECK GAS TYPE
Use only natural gas. If your gas supply is not natural, do not install heater. Call
dealer where you bought heater for proper type heater.
INSTALLATION ITEMS
Before installing heater, make sure you have the items listed below.
• piping (check local codes)
• sealant (resistant to propane gas)
• manual shutoff valve *
* An A.G.A. design certified manual shutoff valve with 1/8" NPT tap is an acceptable
alternative to test gauge connection. Purchase the optional A.G.A. design certified
manual shutoff valve from your dealer. See Accessories, page 31.
• ground joint union
• test gauge connection *
(see Figure 13, page 15)
LOCATING HEATER
This heater is designed to be mounted on a wall.
WARNING
WARNING ICON G 001
Maintain the minimum clearances shown in Figure 4 (page 10). If you
can, provide greater clearances from floor, ceiling, and joining wall.
• sediment trap
• tee joint
• pipe wrench
You can locate heater on floor, away from a wall. An optional floor mounting stand is
needed. Purchase the floor mounting stand from your dealer. See Accessories, page 31.
Never install the heater
• 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
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
WARNING
WARNING ICON G 001
CAUTION
WARNING ICON G 001
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 in the air
(such as tobacco smoke) exist, may discolor walls.
100750
IMPORTANT:
stalling heater in rooms without enough ventilation air may cause mildew to form from
too much moisture. See Fresh Air for Combustion and Ventilation, pages 5 through 8.
Vent-free heaters add moisture to the air. Although this is beneficial, in-
Continued
9
INSTALLING
TO WALL
For convenience and efficiency, install heater
• where there is easy access for operation, inspection, and service
• in coldest part of room
Continued
An optional fan kit is available from your dealer. See Accessories, page 31. If
planning to use fan, locate heater near an electrical outlet.
CEILING
36"
8"
Minimum
From
Sides Of
Heater
Left
Side
FLOOR
Figure 4 - Mounting Clearances As Viewed From Front of Heater
Minimum
Right
Side
3"
Minimum To Top Surface
Of Carpeting, Tile Or Other
Combustible Material
THERMOSTAT SENSING BULB
(Models VN1800IT and VN2550IT Only)
The thermostat sensing bulb has been placed inside the heater for protection during
shipping.
Locating Thermostat Sensing Bulb
1. Remove front panel of heater (see Figure 7, page 11).
2. Locate thermostat sensing bulb just under the burner assembly.
IMPORTANT:
operation.
Attaching Thermostat Sensing Bulb
1. Remove thermostat sensing bulb from holders inside heater. Route through slot
opening in bottom of heater.
2. Place clamp on thermostat sensing bulb as shown in Figure 5. Clamp is provided in hardware package.
3. Snap clamp into upper mounting hole as shown in Figure 5. Mounting hole is
located on lower left edge on back of heater. Make sure the thermostat sensing
bulb is pointing up.
Attach thermostat sensing bulb to the back of heater for proper
Thermostat
Sensing Bulb
Clamp
10
Figure 5 - Attaching Thermostat Sensing Bulb
100750
INSTALLING
TO WALL
Continued
INSTALLING HEATER TO WALL
Mounting Bracket
The mounting bracket is located on back panel of heater. It has been taped there for
shipping. Remove mounting bracket from back panel.
Mounting
Bracket
Figure 6 - Mounting Bracket Location
Removing Front Panel Of Heater
1. Remove two screws near bottom corners of front panel.
2. Lift straight up on grill guard until it stops. Grill guard will slide up about 1/4".
3. Pull bottom of front panel forward, then down.
100750
Figure 7 - Removing Front Panel Of Heater
Methods For Attaching Mounting Bracket To Wall
Only use last hole on each end of mounting bracket to attach bracket to wall. These
two holes are 16 inches apart from their centers. Attach mounting bracket to wall in
one of two ways.
1. Attaching to wall stud
2. Attaching to wall anchor
Attaching to wall stud This method provides the strongest hold. Insert mounting
screws through mounting bracket and into wall studs.
Attaching to wall anchor This method allows you to attach mounting bracket to
hollow walls (wall areas between studs) or to solid walls (concrete or masonry).
Decide which method better suits your needs. Either method will provide a secure
hold for the mounting bracket.
Continued
11
INSTALLING
TO WALL
Marking Screw Locations
1. Tape mounting bracket to wall where heater will be located. Make sure mounting
bracket is level.
Continued
WARNING
WARNING ICON G 001
Maintain minimum clearances shown in Figure 8. If you can, provide greater clearances from floor and joining wall.
2. Mark screw locations on wall (see Figure 8).
Note:
Only mark last hole on each end of mounting bracket. Insert mounting
screws through these holes only.
3. Remove tape and mounting bracket from wall.
13"
Min.
Only Insert Mounting
Screws Through Last
Hole On Each End
Adjoining Wall
Models VN3000C and VN2550IT Models VN1800C and VN1800IT
16"
18 3/4"
Min.
Floor
9 1/4"
Min.
Only Insert Mounting
Screws Through Last
Hole On Each End
Adjoining Wall
16"
Floor
18 3/4"
Min.
Figure 8 - Mounting Bracket Clearances
Attaching Mounting Bracket To Wall
Note:
Wall anchors, mounting screws, and spacers are in hardware package. The
hardware package is provided with heater.
Attaching to wall stud method
For attaching mounting bracket to wall studs
1. Drill holes at marked locations using 9/64" drill bit.
2. Place mounting bracket onto wall. Line up last hole on each end of bracket with
holes drilled in wall.
3. Insert mounting screws through bracket and into wall studs.
4. Tighten screws until mounting bracket is firmly fastened to wall studs.
Attaching to wall anchor method
For attaching mounting bracket to hollow walls (wall areas between studs) or solid
walls (concrete or masonry)
1. Drill holes at marked locations using 5/16" drill bit. For solid walls (concrete or
masonry), drill at least 1" deep.
2. Fold wall anchor as shown in Figure 9.
12
Figure 9 - Folding Anchor
3. Insert wall anchor (wings first) into hole. Tap anchor flush to wall.
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