Desa RFN28TD User Manual

VENT-FREE NATURAL GAS
RADIANT FLAME® HEATER

OWNER’S OPERATION AND INSTALLATION MANUAL

RFN28TD

15,000 to 28,000 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 qualified installer, service agency, or the
gas supplier.

®

Shown with Optional

Mantel featuring

Built-in Base

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 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* manufactured (mobile) home, where not prohib­ited by state or local codes.

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

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.

Save this manual for future reference.

15,000 TO 28,000 BTU/HR

VENT-FREE NATURAL GAS HEATER

SAFETY
INFORMATION

WARNINGS

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: 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,
people 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.

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. 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 Air for Combustion
and Ventilation, pages 5 through 7.

6. Before using furniture polish, wax, car­pet cleaner, or similar products, turn
heater off. If heated, the vapors from
these products may creat a white pow­der residue within burner box or on
adjacent walls or furniture.

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. Never place any objects on the heater.

10. 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.

11. Carefully supervise young children
when they are in same room with
heater.

12. Make sure screen is in place before run­ning heater.

13. 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.

14. Turn off and unplug heater and let cool
before servicing. Only a qualified ser­vice person should service and repair
heater.

15. Operating heater above elevations of
4,500 feet may cause pilot outage.

WARNING: Do not use a
blower insert, heat exchanger
insert, or other accessory not ap­proved for use with this heater.

2

104779

PRODUCT
IDENTIFICATION

Ignitor Button

Heater
Cabinet

Log

Note:

Do not remove
Lighting and Warning
Plates from heater

Control Knob

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OWNER’S MANUAL

PRODUCT
FEATURES

Safety Pilot

Lighting and
Warning
Plates

Screen

Front
Panel

This heater has a pilot with an Oxygen
Depletion Sensor Shutoff System (ODS).
The ODS/pilot is a required feature for vent­free 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.

Figure 1 - Vent-Free Gas Log Natural Gas Space Heater

LOCAL CODES

Install and use heater with care. Follow all
local codes. In the absence of local codes,
use the latest edition of The 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

UNPACKING

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 inform
dealer where you bought heater.

National Fire Protection Association, Inc.

Batterymarch Park

Quincy, MA 02269

104779

3

15,000 TO 28,000 BTU/HR

VENT-FREE NATURAL GAS HEATER

ASSEMBLY

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).

Installing Log

Note:

For easier installation, lay heater on

its back.

1. Remove log from inside top of heater.
Discard protective packaging.

2. Attach ignitor cable to piezo ignitor
(see Figure 3).

3. With Phillips screwdriver, remove four
screws holding screen in place. Re­move screen.

4. Gently slide log between log retaining
brackets on deflector assembly (see Fig­ure 4). The log should fit firmly against
bottom of log retaining brackets.

5. Reattach screen using four screws re­moved in step 3.

Figure 2 - Removing Front Panel of Heater

Log

Front Panel

Screen

Truss­Head
Screw

Brass
Front Trim

Nut

Piezo Ignitor

Ignitor
Cable

Figure 3 - Attaching Ignitor Cable to Piezo
Ignitor

Heater Cabinet

Deflector

Log
Retaining
Brackets

Burner Shield

Screw

WARNING: Always have
burner shield and screen in place
before operating heater. This pre­vents excessive temperatures 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.

Screw

Figure 4 - Assembling Heater

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 5).

3. Line up screws with holes in front panel
(see Figure 4). Insert screws in holes.
Attach nuts from inside of front panel.
Tighten with wrench.

4

Front Panel

Brass Front
Trim

Truss-Head
Screw

Figure 5 - Attaching Brass Front Trim to
Front Panel

Nut

104779

OWNER’S MANUAL

ASSEMBLY

Continued

Assembling and Attaching
Brass Trim

1. Remove packaging from remaining
three pieces of brass trim.

2. Locate four brass screws, two adjust­ing plates with set screws, and two
shims in the hardware packet.

3. Align shim under adjusting plate as
shown in Figure 6.

4. Slide one end of adjusting plate/shim
in slot on mitered edge of top brass trim
(see Figure 6).

5. Slide other end of adjusting plate/shim
in slot on mitered edge of side brass
trim (see Figure 6).

6. While firmly holding edges of brass
trim together, 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 7).

9. Reattach front panel to heater if you are
going to mount the heater to the base.
Do not reattach front panel at this time
if you are going to mount heater to wall.

Set Screws

Side Brass
Trim

Slot

Figure 6 - Assembling Brass Trim

Assembled
Brass Trim

Figure 7 - Attaching Brass Trim to Heater

Adjusting
Plate

Shim

Mitered Edge

Screws

Top
Brass
Trim

Slot

AIR FOR
COMBUSTION AND
VENTILATION

WARNING: This heater shall
not be installed in a confined space
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.

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 fuel­burning appliances.

PROVIDING ADEQUATE
VENTILATION

The following is excerpts from National
Fuel Gas Code. NFPA 54/ANSI Z223.1,
Section 5.3, Air for Combustion and Venti­lation.

All spaces in homes fall into one of the three
following 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

outside atmosphere have a con­tinuous water vapor retarder with
a rating of one perm (6 x 10
per pa-sec-m2) or less with open­ings 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

From Outdoors

If your home does not meet all of the
three criteria above, proceed to

and

, page 7

Ventilation Air

.

-11

and

Deter-

kg

mining Fresh-Air Flow for Heater Lo­cation,

page 6.

Confined and Unconfined Space

The National Fuel Gas Code (ANSI Z223.1,
1992 Section 5.3) defines 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
appliances installed in that space and an
unconfining space as a space whose volume
is not less than 50 cubic feet per 1,000 Btu
per hour (4.8 m3 per 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.

This heater shall not be installed in a con­fined space or unusually tight construction
unless provisions are provided for adequate
combustion and ventilation air.

* Adjoining rooms are communicating only
if there are doorless passageways or ventila­tion grills between them.

Continued

104779

5

15,000 TO 28,000 BTU/HR

VENT-FREE NATURAL GAS HEATER

AIR FOR
COMBUSTION AND
VENTILATION

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:

3. Add the Btu/Hr of all fuel burning appliances in the space.
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
* 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 adjoin-

ing 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 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, 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 Btu/Hr the space can support)

Example:

Gas water heater 30,000 Btu/Hr
Vent-free heater + 28,000 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: 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, 1992, Section 5.3

6

or applicable local codes.

104779

Or

Remove
Door into
Adjoining

Room,

Option 3

Ventilation Grills

Into Adjoining Room,

Option 2

12"

12"

Ventilation

Grills

into Adjoining

Room,

Option 1

AIR FOR
COMBUSTION AND
VENTILATION

Continued

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 8). You can also
remove door into adjoining room (see op­tion 3, Figure 8). 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.

OWNER’S MANUAL

WARNING: Rework work­sheet, adding the space of the
adjoining unconfined space. The
combined spaces must have
enough fresh air to supply all
appliances in both spaces.

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 ventila-

tion grills or ducts.

IMPORTANT:

inlet or outlet air into attic if attic has a thermo­stat-controlled power vent. Heated air enter­ing the attic will activate the power vent.

Do not provide openings for

Figure 8 - Ventilation Air from Inside Building

Figure 9 - Ventilation Air from Outdoors

Outlet
Air

Inlet
Air

Outlet
Air

Inlet Air

Ventilated
Attic

To Attic

To

Crawl

Space

Ventilated

Crawl Space

104779

7

15,000 TO 28,000 BTU/HR

36"

5"

FLOOR

CEILING

Minimum

Minimum
Of Carpe
Combust

6"
Minimum
From
Sides Of
Heater

Left
Side

Right
Side

VENT-FREE NATURAL GAS HEATER

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 primary
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.

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 gas, 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/LP gas)

• manual shutoff valve *

• ground joint union

• test gauge connection *

• sediment trap

• tee joint

• pipe wrench
* 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 21.

LOCATING HEATER

WARNING: Maintain the mini-

mum clearances shown in Figure

10. If you can, provide greater
clearances from floor, ceiling, and
joining wall.

You can locate heater on floor. The optional
hearth base is needed. You can also install
the optional decorative mantel on the heater
(some mantels require hearth base).

IMPORTANT:

and hearth base specified in this manual.
Purchase the optional mantel and hearth
base from your dealer. See Accessories,
page 21.

The heater may also be mounted on a wall.
You cannot use optional mantel if mounting
heater on a wall.

WARNING: 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

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 to­bacco smoke, aromatic candles,
cleaning fluids, oil or kerosene
lamps, etc.) in the air exist, may
discolor walls.

Only use optional mantel

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 Air for Com-
bustion and Ventilation, pages 5 through 7.

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,
inspection, 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.

Minimum To
Top Surface
Of Carpeting,
Tile or Other
Combustible
Material

Figure 10 - Mounting Clearances As
Viewed From Front of Heater

8

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