Desa Tech RFN30TA, RFP30TA, VMH3000TNA, VMH3000TPA Owner's Manual
VENT-FREE HEATER
OWNER’S OPERATION AND INSTALLATION MANUAL
Shown with Optional
Mantel Which Features
a Built-in Base
RFN30TA, RFP30TA
VMH3000TNA, VMH3000TPA
15,000 to 30,000 Btu/Hr with Thermostat
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 quali-
fied installer, service agency or the gas supplier.
Save this manual for future reference.
For more information, visit www.desatech.com
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 7 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 indicated 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.
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TABLE OF CONTENTS
Safety Information ............................................... 3
Local Codes ........................................................ 4
Product Identification ........................................... 4
Unpacking ........................................................... 4
Product Features ................................................. 5
Assembling Heater ............................................. 5
Air for Combustion and Ventilation ...................... 7
Installation ........................................................... 9
Operating Heater ............................................... 16
Inspecting Burners ............................................ 18
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Cleaning and Maintenance ................................ 19
Troubleshooting ................................................. 20
Specifications .................................................... 23
Replacement Parts ............................................ 23
Service Hints ..................................................... 23
Technical Service ..............................................
Illustrated Parts Breakdown and Parts List ....... 24
Accessories ....................................................... 26
Parts Centrals .................................................... 27
109889-01B2
23
SAFETY INFORMATION
WARNING: This product contains and/or generates chemicals
known to the state of California
to cause cancer or birth defects
or other reproductive harm.
IMPORTANT: Read this owner’s
manual carefully and completely
before trying to assemble, operate
or service this heater. Improper
use of this fireplace 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.
Natural and Propane/LP Gas: Natural and pro-
pane/LP gases are odorless. An odor-making agent
is added to the gas. The odor helps you detect a gas
leak. However, the odor added to the gas can fade.
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 allow fans
to blow directly into the heater.
Avoid any drafts that alter burner
flame patterns. Ceiling fans can
create drafts that alter burner
flame patterns. Altered burner
patterns can cause sooting.
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
clothi ng ig nition. Fireplace
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will remain hot for a time after
shutdown. Allow surface to cool
before touching.
Carefully supervise young children when they are in the room
with heater.
Keep the appliance area clear
and free from combustible materials, gasoline and other flam
mable vapors and liquids.
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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 units 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
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109889-01B 3
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SAFETY INFORMATION
Continued
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
Dep letion Sensing (ODS) safety shutoff
system. The ODS shuts down the heater if
not enough fresh air is available. See Air for
Combustion and Ventilation
6. If heater shuts off, do not relight until you
provide fresh, outside air. If heater keeps
shutting off, have it serviced.
7. To prevent the creation of soot, follow the
instructions in Cleaning and Maintenance
page 19.
8. Before using furniture polish, wax, carpet
cleaner or similar products, turn heater off. If
heated, the vapors from these products may
create a white powder residue within burner
box or on adjacent walls or furniture.
9. Do not run heater
• where flammable liquids or vapors are used
or stored.
• under dusty conditions.
10. 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.
11. Turn off and unplug heater and let cool before
servicing. Only a qualified service person
should service and repair heater.
12. To prevent performance problems, do not
use propane/LP fuel tank of less than 100 lb.
capacity (propane/LP units only).
13. Operating heater above elevations of 4,500
feet may cause pilot outage.
14. Prov ide adeq ua te clearan ce s around air
openings.
, page 7.
LOCAL CODES
Install and use heater with care. Follow all local
codes. In the absence of local codes, use the lat
est edition of The National Fuel Gas Code, ANSI
Z223.1/NFPA 54*
*Available from:
American National Standards Institute, Inc.
National Fire Protection Association, Inc.
.
1430 Broadway
New York, NY 10018
Batterymarch Park
Quincy, MA 02269
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PRODUCT
IDENTIFICATION
Note: Do not remove
Lighting and Warning
Plates from heater
Control Knob
Ignitor Button
,
Figure 1 - Vent-Free Gas Space Heater
Lighting and
Warning Plates
Log
UNPACKING
CAUTION: Do not remove
the data plates attached to the
heater assembly. The data plates
contain important warranty and
safety information.
1. Remove heater from carton.
2. Remove all protective packaging applied to
heater for shipment.
3. Make sure your heater includes two hardware
packets.
4. Check heater for any shipping damage. If
heater is damaged, promptly return to dealer
where you bought heater.
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109889-01B4
Screen
Front
Panel
PRODUCT FEATURES
SAFETY PILOT
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.
PIEZO IGNITION SYSTEM
This heater has a piezo ignitor. This system requires no matches, batteries or other sources to
light heater.
THERMOSTATIC HEAT CONTROL
This heater has a thermostat sensing bulb and a
control valve. This results in the greatest heater
comfort. This can also result in lower gas bills.
ASSEMBLING HEATER
Tools Required:
• Phillips screwdriver
• 5/16” hex wrench
• slotted screwdriver
REMOVING FRONT PANEL OF
HEATER
1. Remove two screws near bottom corners of
front panel with Phillips screwdriver.
2. Pull bottom of front panel forward, then down
(see Figure 2).
Heater
Cabinet
Log
Figure 2 - Removing Front Panel of
Heater
INSTALLING HOOD
1. Remove hood from protective tray.
2. Locate 4 black sheet metal screws from hard
ware pack.
3. Place hood on deflector and line up holes (see
Figure 3).
4. Secure hood to deflector with 4 black sheet
metal screws.
Note: Side of hood should be on the outside flange
of deflector.
Deflector
Hood
Log
Retaining
Brackets
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Front
Panel
Truss-Head
Screw
Brass
Front
Trim
Screw
109889-01B 5
Sheet
Metal
Screw
Nut
Screen
Figure 3 - Assembling Heater
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Burner
Shield
Screw
ASSEMBLING HEATER
Continued
INSTALLING LOG
Note: For easier installation, lay heater on its back.
1. With Phillips screwdriver, remove two screws
holding screen in place. Remove screen.
2. Remove log from inside of deflector. Discard
protective packaging.
3. Gently slide log between log retaining brackets
on deflector assembly (see Figure 3, page 5).
The log should fit firmly against bottom of log
retaining brackets.
4. Reattach screen using two screws removed in
step 1.
WARNING: Always have
burner shield and screen in place
before operating heater. This
prevents excessive tempera
tures on heater surfaces.
Failure to position the parts in accordance with these diagrams or
failure to use only parts specifically approved with this heater
may result in property damage
or personal injury.
ATTACHING BRASS FRONT TRIM
TO FRONT PANEL
1. Locate brass front trim in brass trim package.
2. Slide the head of two truss-head screws from
hardware packet into each end of brass front
trim (see Figure 4).
3. Line up screws with holes in front panel (see
Figure 3, page 5). Insert screws in holes. At
tach nuts from inside of front panel. Tighten
with wrench.
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ASSEMBLING AND ATTACHING
BRASS TRIM
1. Remove packaging from remaining three
pieces of brass trim.
2. Locate four brass screws, two adjustin g
plates with set screws and two shims in the
hardware packet.
3. Align shim under adjusting plate as shown in
Figure 5.
4. Slide one end of adjusting plate/shim in slot on
mitered edge of top brass trim (see Figure 5).
5. Slide other end of adjusting plate/shim in slot on
mitered edge of side brass trim (see Figure 5).
6. While firmly holding edges of brass trim to
gether, tighten both set screws on the adjusting
plate with slotted screwdriver.
7. Repeat steps 1 through 6 for other side.
8. Place the assembled trim on front of heater
cabinet. Attach on top and sides with four
brass screws included in hardware package
(see Figure 6).
9. Reattach front panel to heater if you are going
to mount the heater to the base. Do not reat
tach front panel at this time if you are going
to mount heater to wall.
Side Brass
Trim
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Adjusting
Plate
Shim
Slot
Figure 5 - Assembling Brass Trim
Set Screws
Top Brass
Trim
Mitered
Edge
Screws
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Slot
Brass Front
Trim
Truss-Head
Screw
Figure 4 - Attaching Brass Front Trim to
Front Panel
Front Panel
Nut
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Assembled
Brass Trim
Figure 6 - Attaching Brass Trim to Heater
109889-01B6
AIR FOR COMBUSTION
AND VENTILATION
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.
PROVIDING ADEQUATE
VENTILATION
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 7 through 9 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 (6 x 10
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 9.
If your home does not meet all of the three
criteria above, proceed to Determining
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Fresh-Air Flow for Heater Location
Confined and Unconfined Space
The National Fuel Gas Code,
a confined space as a space whose volume is less
than 50 cubic feet per 1,000 Btu per hour (4.8 m3
per kw) of the aggregate input rating of all appli
ances 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
kw) of the aggregate input rating of all appliances
installed in that space. Rooms communicating
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.
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kg per pa-sec-m2) or
ANS Z223.1 defines
DETERMINING FRESH-AIR FLOW
FOR HEATER LOCATION
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.
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,
.
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3
per
109889-01B 7
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AIR FOR COMBUSTION
AND VENTILATION
Continued
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 sup
plied 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 = (Maxi-
mum 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.
Direct-vent draws combustion air from the
outdoors and vents to the outdoors.
Example:
Gas water heater __________ Btu/Hr
Vent-free heater + __________
Total = __________
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)
30,000
30,000
60,000
Btu/Hr
Btu/Hr
Btu/Hr
Btu/Hr
Btu/Hr
Btu/Hr
Btu/Hr
Btu/Hr
Btu/Hr
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.
B. Vent room directly to the outdoors. See Ven
tilation Air From Outdoors,
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 maxi
mum Btu/Hr the space can support, the space is
an unconfined space. You will need no additional
fresh air ventilation.
page 9.
WARNING: If the area in
which the heater may be operated 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.
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 7,
page 9). You can also remove door into adjoining
room (see option 3, Figure 7, page 9). 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.
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109889-01B8
Or
Remove
Door into
Adjoining
Room,
Option 3
Ventilation Grills
Into Adjoining Room,
Option
2
12"
12"
Ventilation
Grills
into Adjoining
Room,
Option 1
Outlet
Air
Ventilated
Attic
Outlet
A
ir
Inlet
Air
Inlet Air
Ventilated
Crawl Space
To
Crawl
Space
To Attic
AIR FOR COMBUSTION
AND VENTILATION
Continued
INSTALLATION
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 ser-
vice person must install heater.
Figure 7 - Ventilation Air from Inside
Building
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.
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Figure 8 - Ventilation Air from Outdoors
109889-01B 9
Follow all local codes.
CHECK GAS TYPE
Use the correct gas type (natural or propane/LP)
for your unit. If your gas supply is not correct, 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
is not permitted.
INSTALLATION ITEMS
Before installing heater, make sure you have the
items listed below.
• 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. Purchase the optional CSA
design-certified equipment shutoff valve from your
dealer. See
Accessories, page 26.
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