FMI GWN20TC User manual

For more information, visit www.fmiproducts.com
WARNING: If the information in this manual is not
followed exactly, a re or explosion may result causing
property damage, personal injury or loss of life.
— Do not store or use gasoline or other ammable
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 re
department.
— Installation and service must be performed by a quali-
ed installer, service agency or the gas supplier.
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
UNVENTED (VENT-FREE) BLUE FLAME GAS HEATER
SAFETY INFORMATION AND INSTALLATION MANUAL
MODELS
GWN20TC, GWP20TC,
GWN30TC, GWP30TC,
VSHN20T, VSHP20T,
VSHN30T, VSHP30T
PFS
®
US

www.fmiproducts.com 125325-01A2
This appliance may be in-
stalled in an aftermarket,*
permanently located,
manufactured (mobile)
home, where not prohib-
ited by local codes.
* Aftermarket: Completion of sale, not for
purpose of resale, from the manufacturer
WARNING: This product con-
tains 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 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
u, 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 af-
fected by carbon monoxide than others. These
include pregnant women, people with heart or
lung disease or anemia, those under the inu-
ence of alcohol and those at high altitudes.
SAFETY
TABLE OF CONTENTS
Safety .................................................................. 2
Local Codes......................................................... 4
Product Identication ........................................... 4
Unpacking............................................................ 4
Product Features ................................................. 4
Air For Combustion and Ventilation ..................... 5
Installation ........................................................... 7
Operation ........................................................... 15
Inspecting Heater .............................................. 17
Cleaning and Maintenance ................................ 18
Troubleshooting ................................................. 19
Specications .................................................... 23
Replacement Parts ............................................ 23
Service Hints ..................................................... 23
Technical Service............................................... 23
Parts .................................................................. 24
Accessories ....................................................... 26
Warranty ..............................................Back Cover
WARNING: Improper
installation, adjustment,
alteration,service or main-
tenance can cause injury
or property damage. Refer
to this manual for correct
installation and operation-
al procedures. For assis-
tance or additional infor-
mation consult a qualied
installer, service agency
or the gas supplier.
WARNING: This is an
unvented gas-red heat-
er. 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 Ven-
tilation section on page 5
of this manual.
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.

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125325-01A 3
Keep the appliance area clear
and free from combustible ma-
terials, gasoline and other am-
mable 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)
inside any structure. Locate propane/LP
supply tank(s) outdoors.
3. This heater shall not be installed in a
bedroom or bathroom.
4. 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 sup-
plier’s instructions
• if you cannot reach your gas supplier,
call the re department
5. This heater needs fresh, outside air ventila-
tion to run properly. This heater has an Oxy-
gen 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.
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 ammable liquids or vapors are
used or stored
• under dusty conditions
9. 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 furni-
ture.
10. Do not use heater if any part has been
under water. Immediately call a qualied
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.
Natural and Propane/LP Gas: Natural and
propane/LP gases are odorless. An odor-
making agent is added to these gases. 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
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.
WARNING: Do not use a
blower insert, heat exchanger
insert or other accessory not ap-
proved for use with this heater.
Due to high temperatures, the
appliance should be located out
of trafc and away from furniture
and draperies.
Do not place clothing or other
ammable 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 shut-
down. Allow surface to cool
before touching.
Carefully supervise young chil-
dren when they are in the room
with heater.
Make sure grill guard is in place
before running heater.
SAFETY
Continued

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SAFETY
Continued
Figure 1 - Vent-Free Gas Heater
(actual heater may vary from illustration
14. Provide adequate clearances around air
openings.
11. Turn off and let cool before servicing. Only
a qualied service person should service
and repair heater.
12. Operating heater above elevations of
4,500 feet (1,371 m) could cause pilot
outage.
13. To prevent performance problems, do not
use propane/LP fuel tank of less than 100
lbs. (45 kg) capacity.
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/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
State of Massachusetts: The installa-
tion must be made by a licensed plumber
or gas fitter in the Commonwealth of
Massachusetts.
Sellers of unvented propane or natural
gas-red 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
Commonwealth of Massachusetts.
PRODUCT
IDENTIFICATION
UNPACkING
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 call FMI PRODUCTS,
LLC at 1-866-328-4537 for replacement
parts before returning to dealer.
PRODUCT FEATURES
SAFETY DEVICE
This heater has a pilot with an Oxygen Deple-
tion 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.
IGNITION SYSTEM
Some models are equipped with a piezo
ignitor that requires no matches, batteries or
other sources to light heater.
Other heaters are equipped with an electronic
ignitor to light heater fuel supply.
THERMOSTATIC HEAT CONTROL
Thermostat models have a thermostat sens-
ing bulb and a control valve. This results in the
greatest heater comfort. This can also result
in lower gas bills.
Ignitor Button
Control Knob
Heater
Cabinet
Front Panel
Glass Panel
Grill Guard

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125325-01A 5
AIR FOR COMBUSTION AND VENTILATION
WARNING: This heater shall
not be installed in a room or space
unless the required volume of in-
door combustion air is provided
by the method described in the
National Fuel Gas Code, ANSI
Z223.1/NFPA 54, the International
Fuel Gas Code, or applicable lo-
cal codes. Read the following in-
structions to insure proper fresh
air for this and other fuel-burning
appliances in your home.
Today’s homes are built more energy efcient
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. Dur-
ing heating months, home owners want their
homes as airtight as possible.
While it is good to make your home energy
efcient, your home needs to breathe. Fresh
air must enter your home. All fuel-burning ap-
pliances need fresh air for proper combustion
and ventilation.
Exhaust fans, heaters, 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, Air for
Combustion and Ventilation.
All spaces in homes fall into one of the three
following ventilation classications:
1. Unusually Tight Construction
2. Unconned Space
3. Conned 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 un-
usually tight construction, you must provide
additional fresh air.
Unusually tight construction is dened as
construction where:
a. walls and ceilings exposed to the outside
atmosphere have a continuous water
vapor retarder with a rating of one perm
(6x10-11 kg per pa-sec-m2) or 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 oors,
between wall-ceiling joints, between wall
panels, at penetrations for plumbing,
electrical and gas lines and at other open-
ings.
If your home meets all of the three criteria above,
you must provide additional fresh air. See Ven-
tilation 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.
Conned Space and Unconned Space
The National Fuel Gas Code ANSI Z223.1/
NFPA 54 denes a conned 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 ag-
gregate input rating of all appliances installed
in that space and an unconned 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 un-
conned space.
* Adjoining rooms are communicating only if
there are doorless passageways or ventilation
grills between them.

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4. Compare the maximum Btu/Hr the space
can support with the actual amount of Btu/
Hr used.
_______ Btu/Hr (maximum can support)
_______ Btu/Hr (actual amount 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 example is a conned 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
unconned 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
Ventilation Air From Outdoors, page 7.
C. Install a lower Btu/Hr heater, if lower Btu/Hr
size makes room unconned.
If the actual Btu/Hr used is less than the maxi-
mum Btu/Hr the space can support, the space is
an unconned space. You will need no additional
fresh air ventilation.
WARNING:Iftheareainwhich
the heater may be operated does
not meet the required volume for
indoor combustion air, combus-
tion and ventilation air shall be
provided by one of the methods
described in the National Fuel
Gas Code,ANSI Z223.1/NFPA 54,
the International Fuel Gas Code,
or applicable local codes.
DETERMINING FRESH-AIR FLOW
FOR HEATER LOCATION
Determining if You Have a Conned or
Unconned Space
Use this work sheet to determine if you have
a conned or unconned 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. (6.1m) (length) x
16 ft. (4.88m) (width) x 8 ft. (2.44 m) (ceiling
height) = 2,560 cu. ft. (72.49 m2)(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 = (Maxi-
mum Btu/Hr the space can support)
Example: 2,560 cu. ft. (72.49 m2) (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 _________ Btu/Hr
Gas water heater* _________ Btu/Hr
Gas furnace _________ Btu/Hr
Vented gas heater _________ Btu/Hr
Gas heater 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.
Example:
Gas water heater _________ Btu/Hr
Vent-free heater + _________ Btu/Hr
Total = _________ Btu/Hr
AIR FOR COMBUSTION AND VENTILATION
Continued
40,000
60,000
20,000

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125325-01A 7
VENTILATION AIR
Ventilation Air From Inside Building
This fresh air would come from an adjoining
unconned space. When ventilating to an
adjoining unconned space, you must provide
two permanent openings: one within 12" (30.5
cm) of the ceiling and one within 12" (30.5 cm)
of the oor on the wall connecting the two
spaces (see options 1 and 2, Figure 2, page
7). You can also remove door into adjoining
room (see option 3, Figure 2, page 7). Follow
the National Fuel Gas Code, ANSI Z223.1/
NFPA 54, 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" (30.5 cm) of the ceil-
ing and one within 12" (30.5 cm) of the oor.
Connect these items directly to the outdoors
or spaces open to the outdoors. These spaces
include attics and crawl spaces. Follow the Na-
tional Fuel Gas Code, ANSI Z223.1/NFPA 54,
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 thermostat-
controlled power vent. Heated air entering the
attic will activate the power vent.
AIR FOR COMBUSTION AND VENTILATION
Continued
Figure 2 - Ventilation Air from Inside
Building
Figure 3 - Ventilation Air from Outdoors
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 qualied ser-
vice person must install heater.
Follow all local codes.
CHECK GAS TYPE
Use only 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 either natural gas or
propane/LP gas but not both. Gas
type is indicated on the rating plate.
Field conversion is not permitted.
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
Air
Inlet
Air
Inlet Air Ventilated
Crawl Space
To
Crawl
Space
To Attic

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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, to-
bacco smoke, aromatic candles,
cleaning uids, oil or kerosene
lamps, etc.) in the air exist, may
discolor walls or cause odors.
IMPORTANT: Vent-free heaters add mois-
ture to the air. Although this is benecial,
installing heater in rooms without enough
ventilation air may cause mildew to form
from too much moisture. See Air for Com-
bustion and Ventilation, page 5. If high
humidity is experienced, a dehumidier
may be used to help lower the water vapor
content in the air.
CAUTION: If you install the
heater in a home garage
• heater pilot and burner must be at
least 18" (45.7 cm) above oor
• locate heater where moving
vehicle will not hit it
For convenience and efciency, install heater
• where there is easy access for operation,
inspection and service
• in coldest part of room
If not included with your heater, an optional fan
kit is available from your dealer. See Acces-
sories, page 26. If planning to use fan, locate
heater near an electrical outlet (see page 16).
INSTALLATION ITEMS
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
• sediment trap
• tee joint
• pipe wrench
• for natural gas, test gauge connection*
• hardware packet (included)
- wall anchor (4) 095112-02
- red key (1) 095116-01
- pan head screw, black (4) 097403-02
- nylon spacer (2) 099064-02
- clip (1) 099123-01
- Phillips head screw, silver (4) 100159-02
* An equipment shutoff valve with 1/8" NPT
tap is an acceptable alternative to test gauge
connection. The optional equipment shutoff
valve can be purchased from your dealer.
LOCATING HEATER
This heater is designed to be mounted on a wall.
WARNING: Maintain the
minimum clearances shown
in Figure 4. If you can, provide
greater clearances from oor,
ceiling and joining wall.
You can locate heater on oor, away from
a wall. An optional oor mounting stand is
needed. Purchase the oor mounting stand
from your dealer. See Accessories, page 26,
if stand is not included with your heater.
WARNING: Never install the
heater
• in a bedroom or bathroom
• in a recreational vehicle
• where curtains, furniture, cloth-
ing or other ammable objects
are less than 36" (91.5 cm)
from the front, top or sides of
the heater
• as a replace insert
• in high trafc areas
• in windy or drafty areas
INSTALLATION
Continued

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125325-01A 9
INSTALLING HEATER TO WALL
Mounting Bracket
Locate mounting bracket in heater carton. Re-
move mounting bracket from heater carton.
Figure 4 - Mounting Clearances As
Viewed From Front of Heater
INSTALLATION
Continued
Figure 5 - Mounting Bracket
Figure 6 - Removing Front Panel of
Heater (actual heater may vary from
Illustration)
Minimum
From
Sides Of
Heater
2" (5.1 cm)
FLOOR
CEILING
36"
(91.5 cm)
Minimum
Minimum To
Top Surface
Of Carpeting,
Tile Or Other
Combustible
Material
Left
Side
Right
Side
10" (25.4 cm)
36"
(91.5 cm)
THERMOSTAT SENSING BULB
(Thermostat Models Only)
The thermostat sensing bulb is located below
the heater. Do not move this bulb during instal-
lation or operation of the heater.
Screw
Front Panel
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 14" (35.6 cm) apart from their cen-
ters. 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 pro-
vides the strongest hold. Insert mounting
screws through mounting bracket and into
wall studs.
Attaching to Wall Anchor: This method al-
lows 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.
Marking Screw Locations
1. Tape mounting bracket to wall where
heater will be located. Make sure mount-
ing bracket is level.
WARNING: Maintain minimum
clearances shown in Figure
8, page 10. If you can, provide
greater clearances from oor and
joining wall.
Removing Front Panel Of Heater
1. Remove the four painted screws, two on
each side of front panel.
2. Pull bottom of front panel forward, then
out.
3. Remove any remaining packaging materi-
als.

www.fmiproducts.com 125325-01A10
INSTALLATION
Continued
Figure 8 - Folding
Anchor
Figure 10 - Mounting Heater onto
Mounting Bracket
Figure 9 - Popping
Open Anchor Wings
for Thin Walls
2. Mark screw locations on wall (see Figure 7).
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.
Attaching Mounting Bracket To Wall
Note: Wall anchors, mounting screws and
spacers are in hardware package. The hard-
ware 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
rmly fastened to wall studs.
Mounting
Bracket
(attached
to wall)
Horizontal Slots
Stand-Out Tab
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" (2.5 cm) deep.
2. Fold wall anchor as shown in Figure 9.
3. Insert wall anchor (wings rst) into hole.
Tap anchor ush to wall.
4. For thin walls [1/2" (1.3 cm) or less], insert
red key into wall anchor. Push red key to
“pop” open anchor wings. IMPORTANT:
Do not hammer key! For thick walls [over
1/2" (1.3 cm) thick] or solid walls, do not
pop open wings.
5. Place mounting bracket onto wall. Line up
last hole on each end of bracket with wall
anchors.
6. Insert mounting screws through bracket
and into wall anchors.
7. Tighten screws until mounting bracket is
rmly fastened to wall.
Placing Heater On Mounting Bracket
1. Locate two horizontal slots on back panel
of heater.
2. Place heater onto mounting bracket. Slide
horizontal slots onto stand-out tabs on
mounting bracket.
Figure 7 - Mounting bracket Clearances
16"
Min.
14"
12"
Min.
Adjoining Wall
14"
Adjoining Wall
Only Insert Mounting
Screws Through Last
Hole On Each End
Only Insert Mounting
Screws Through Last
Hole On Each End
Floor
Floor
19 3/4"
Min.
19 3/4"
Min.
30,000 Btu/Hr Models
20,000 Btu/Hr Models

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125325-01A 11
MOUNTING HEATER TO FLOOR
WITH OPTIONAL FLOOR KIT
Mounting Base Feet to Heater
Note: A 90° elbow is required for mounting
this unit and must be installed BEFORE base
feet to provide proper clearance (see Figure
14, page 13).
1. Lay heater cabinet on its back on a table
with the heater bottom overhanging table
edge.
2. Apply pipe joint sealant lightly to male NPT
threads of elbow. Hold pressure regulator
with a wrench when connecting elbow.
Do not overtighten elbow to regulator.
Regulator body could be damaged.
3. Align holes in base foot with mounting holes
on bottom of cabinet (see Figure 12).
4. Secure base foot to heater using sheet
metal screws.
5. Repeat for other side.
Installing Bottom Mounting Screws
1. Locate two bottom mounting holes. These
holes are near bottom on back panel of
heater (see Figure 11).
2. Mark screw locations on wall.
3. Remove heater from mounting bracket.
4. If installing bottom mounting screws into
hollow or solid wall, install wall anchors.
Follow steps 1 through 4 under Attaching
To Wall Anchor Method.
If installing bottom mounting screw into
wall stud, drill holes at marked locations
using 9/64" drill bit.
5. Replace heater onto mounting bracket.
6. Place spacers between bottom mounting
holes and wall anchor or drilled hole.
7. Hold spacer in place with one hand. With
other hand, insert mounting screw through
bottom mounting hole and spacer. Place
tip of screw in opening of wall anchor or
drilled hole.
8. Tighten both screws until heater is rmly
secured to wall. Do not over tighten.
Note: Do not replace front panel at this
time. Replace front panel after making
gas connections and checking for leaks
(see page 12 through 14).
INSTALLATION
Continued
Figure 11 - Installing Bottom Mounting
Screws
Figure 12 - Installing Base Feet (actual
heater may vary from illustration)
Side View
Front View
Wall
Spacer
Heater
Sheet
Metal
Screw
Wood
Screw
Base Foot
Mounting Base Feet to Floor
1. Remove front panel (see Removing Front
Panel of Heater, page 9).
2. Position heater with base feet in desired
location. Mark holes for drilling. Remove
heater with base.
3. For carpeted oors, make a small cut with
a sharp knife at marked locations prior to
drilling. If mounting base to a wood oor,
drill 1/8" diameter hole, 3/4" deep. (Do not
use anchors in wood oors).
If mounting base to a concrete oor, drill
with 1/4" diameter concrete drill bit, 13/8"
into oor. Insert anchors completely into
holes.
4. Reposition heater with base feet over
holes. Secure base to oor with wood
screws. See Figure 12.

www.fmiproducts.com 125325-01A12
INSTALLATION
Continued
CONNECTING TO GAS SUPPLY
WARNING: This appliance
requires a 3/8" NPT (National
Pipe Thread) inlet connection to
the pressure regulator.
WARNING: A qualied service
person must connect heater to gas
supply. Follow all local codes.
WARNING: For natural gas, never
connect heater to private (non-utility)
gas wells. This gas is commonly
known as wellhead gas.
IMPORTANT: For natural gas, check gas line
pressure before connecting heater to gas line.
Gas line pressure must be no greater than
10.5" W.C.. If gas line pressure is higher,
heater regulator damage could occur.
CAUTION: For propane/LP
gas, never connect heater di-
rectly to the propane/LP supply.
This heater requires an external
regulator (not supplied). Install
the external regulator between the
heater and propane/LP supply.
For propane/LP gas, the installer must supply
an external regulator. The external regulator will
reduce incoming gas pressure. You must reduce
incoming gas pressure to between 11" and 14"
W.C.. If you do not reduce incoming gas pres-
sure, heater regulator damage could occur. Install
the external regulator with the vent pointing down
as shown in Figure 13. Pointing the vent down
protects it from freezing rain or sleet.
CAUTION: Use only new, black
iron or steel pipe. Internally-tinned
copper tubing may be used in
certain areas. Check your local
codes. Use pipe of large enough
diameter to allow proper gas vol-
ume to heater. If pipe is too small,
undue loss of volume will occur.
Propane/LP
Supply Tank
External
Regulator
with Vent
Pointing
Down
Figure 13 - Equipment Regulator with
Vent Pointing Down
Typical Inlet Pipe Diameters
16-18,000 Btu/hr models - 3/8" or greater
26-30,000 Btu/hr models - 1/2" or greater
Installation must include equipment shutoff
valve, union and plugged 1/8" NPT tap. Locate
NPT tap within reach for test gauge hook up.
NPT tap must be upstream from heater (see
Figure 14, page 13).
IMPORTANT: Install an equipment shutoff
valve in an accessible location. The equip-
ment shutoff valve is for turning on or shutting
off the gas to the appliance.
Check your building codes for an special
requirements for locating equipment shutoff
valve to heater.
Apply pipe joint sealant lightly to male NPT
threads. This will prevent excess sealant from
going into pipe. Excess sealant in pipe could
result in clogged heater valves.
* An equipment shutoff valve with 1/8" NPT
tap is an acceptable alternative to test gauge
connection. Purchase the optional equipment
shutoff valve from your dealer.
WARNING: Use pipe joint
sealant that is resistant to liquid
petroleum (LP) gas.
Install sediment trap in supply line as shown
in Figure 14, page 13. Locate sediment trap
where it is within reach for cleaning. Locate
sediment trap where trapped matter is not
likely to freeze. A sediment trap traps mois-
ture and contaminants. This keeps them from
going into heater controls. If sediment trap is
not installed or is installed wrong, heater may
not run properly.

www.fmiproducts.com
125325-01A 13
CHECKING GAS CONNECTIONS
WARNING: Test all gas piping
and connections, internal and
external to unit, for leaks after
installing or servicing. Correct
all leaks at once.
WARNING: Never use an
open ame to check for a leak.
Apply a noncorrosive leak detec-
tion uid to all joints. Bubbles
forming show a leak. Correct all
leaks at once.
CAUTION: For propane/LP
units, make sure external regula-
tor has been installed between
propane/LP supply and heater.
See guidelines under Connecting
to Gas Supply, page 12.
PRESSURE TESTING GAS SUPPLY
PIPING SYSTEM
Test Pressures In Excess Of 1/2 PSIG (3.5 kPa)
1. Disconnect appliance with its appliance
main gas valve (control valve) and equip-
ment shutoff valve from gas supply piping.
Pressures in excess of 1/2 psig will dam-
age heater regulator.
2. Cap off open end of gas pipe where equip-
ment shutoff valve was connected.
3. Pressurize supply piping system by either
opening propane/LP supply tank valve
for propane/LP gas or opening main gas
valve located on or near gas meter for
natural gas or using compressed air.
4. Check all joints of gas supply piping system.
Apply a commercial leak detection solution
to all joints. Bubbles forming show a leak.
5. Correct all leaks at once.
6. Reconnect heater and equipment shutoff
valve to gas supply. Check reconnected
ttings for leaks.
Figure 14 - Gas Connection
Te e Pipe Cap
J oint Nipple
Tee Joint
Reducer
Bushing to
1/8" NPT
1/8" NPT
Plug Tap
Pressure
Regulator
Test Gauge Connection*
Heater
Cabinet
Sediment Trap
3"
Min.
Natural Gas
From Gas
Meter (7" W.C.
to 10.5" W.C.
Pressure)
Propane/LP
From External
Regulator
(11" W.C. to 14"
W.C. Pressure)
Regulator
Bracket
Ground
Joint
Union
3/8" NPT
Pipe
Nipple
Equipment
Shutoff
Valve*
Connection Using Flexline
3/8" NPT/ 1/2"
Flare 90° Elbow
Flexline
See
illustration
above for
detail
Refer to connector's
instructions
IMPORTANT: Hold the pressure regulator
with wrench when connecting it to gas pip-
ing and/or ttings. Do not over tighten pipe
connection to regulator. The regulator body
could be damaged.
INSTALLATION
Continued
* An equipment shutoff valve with 1/8" NPT
tap is an acceptable alternative to test gauge
connection. Purchase the optional equipment
shutoff valve from your dealer.

www.fmiproducts.com 125325-01A14
Equipment
Shutoff
Valve
Propane/LP
Supply Tank
Thermostat Gas Valve
Equipment
Shutoff
Valve
Gas
Meter
Thermostat Gas Valve
INSTALLATION
Continued
Test Pressures Equal To or Less Than
1/2 PSIG (3.5 kPa)
1. Close equipment shutoff valve (see Fig-
ure 15).
2. Pressurize supply piping system by either
opening propane/LP supply tank valve
for propane/LP gas or opening main gas
valve located on or near gas meter for
natural gas or using compressed air.
3. Check all joints from gas meter for natural
gas (see Figure 16)) or propane/LP supply
tank for propane/LP to equipment shutoff
valve (see Figure 17). Apply a noncor-
rosive leak detection uid to all joints.
Bubbles forming show a leak.
4. Correct all leaks at once.
PRESSURE TESTING HEATER GAS
CONNECTIONS
1. Open equipment shutoff valve (see Figure
15).
2. For natural gas, open main gas valve lo-
cated on or near gas meter. For propane/
LP gas, open propane/LP supply tank
valve.
3. Make sure control knob of heater is in the
OFF position.
4. Check all joints from equipment shutoff
valve to thermostat gas valve (see Figure
16 or 17). Apply a noncorrosive leak de-
tection uid to all joints. Bubbles forming
show a leak.
5. Correct all leaks at once.
6. Light heater (see Operation page 15).
Check all other internal joints for leaks.
7. Turn off heater (see To Turn Off Gas to
Appliance, page 16).
8. Replace front panel.
Figure 16 - Checking Gas Joints for
Natural Gas (actual heater may vary from
illustration)
Figure 17 - Checking Gas Joints for
Propane/LP Gas (actual heater may vary
from illustration)
Open
Closed
Equipment
Shutoff Valve
Figure 15 - Equipment Shutoff Valve

www.fmiproducts.com
125325-01A 15
OPERATION
6. Turn control knob counterclockwise
to the PILOT position. Press in control knob
for ve (5) seconds.
7. With control knob pressed in, push down
and release ignitor button. This will light
pilot. The pilot is attached to the front of
burner. Note: You may be running this
heater for the rst time after hooking up to
gas supply. If so, you may need to press in
control knob for 30 seconds or more. This
will allow air to bleed from the gas system.
If needed, keep pressing ignitor button until
pilot lights. If ignitor does not light pilot, refer
to Troubleshooting, page 19 or contact a
qualied service person or gas supplier for
repairs. Until repairs are made, light pilot
with match. To light pilot with match, see
Manual Lighting Procedure, page 16.
8. Keep control knob pressed in for 30 sec-
onds after lighting pilot. After 30 seconds,
release control knob.
• If control knob does not pop out when
released, contact a qualied service person
or gas supplier for repairs.
Note: If pilot goes out, repeat steps 4
through 7. Wait one (1) minute before light-
ing pilot
9. Turn control knob counterclockwise
to desired heating level. The main burner
should light.
10. To shut off burners only and leave pilot lit,
turn control knob clockwise to the
PILOT position.
Figure 18 - Control Knob in the OFF
Position for Thermostat Models
FOR YOUR SAFETY
READ BEFORE LIGHTING
WARNING: If you do not fol-
low these instructions exactly,
a re or explosion may result
causing property damage, per-
sonal injury or loss of life.
A. This appliance has a pilot which must be
lighted by hand. When lighting the pilot,
follow these instructions exactly.
B. BEFORE LIGHTING smell all around the
appliance area for gas. Be sure to smell
next to the oor because some gas is
heavier than air and will settle on the
oor.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric switch; do not
use any phone in your building.
• Immediately call your gas supplier from
a neighbor’s phone. Follow the gas sup-
plier’s instructions.
• If you cannot reach your gas supplier,
call the re department.
C. Use only your hand to push in or turn the gas
control knob. Never use tools. If the knob
will not push in or turn by hand, don’t try to
repair it, call a qualied service technician or
gas supplier. Force or attempted repair may
result in a re or explosion.
D. Do not use this appliance if any part has
been under water. Immediately call a
qualied service technician to inspect the
appliance and to replace any part of the
control system and any gas control which
has been under water.
LIGHTING
INSTRUCTIONS
1. STOP! Read the safety information above.
2. Make sure equipment shutoff valve is fully
open.
3. Turn off any electric power to the appliance
if service is to be performed.
4. Turn control knob clockwise to the
OFF position.
5. Wait ve (5) minutes to clear out any gas.
Then smell for gas, including near the oor.
If you smell gas, STOP! Follow “B” in the
safety information, column 1. If you don’t
smell gas, go to the next step.
Control
Knob
O
O
T
Control
Knob

www.fmiproducts.com 125325-01A16
CAUTION: Do not try to ad-
just heating levels by using the
equipment shutoff valve.
Figure 19 - Pilot (actual pilot may vary)
OPERATION
Continued
Thermocouple Ignitor Electrode
Pilot Burner
MANUAL LIGHTING
PROCEDURE
1. Remove front panel (see Figure 6, page 9).
2. Follow steps 1 through 5 under Lighting
Instructions, page 15.
3. With control knob pressed in, strike match.
Hold match to pilot until pilot lights.
4. Keep control knob pressed in for 30 sec-
onds after lighting pilot. After 30 seconds,
release control knob. Now follow step 9
under Lighting Instructions, page 15.
5. Replace front panel.
BLOWER
OPERATION
WARNING: Blower accessory
must be grounded. Blower comes
with a three-prong, grounding
plug as shown in Figure 20. The
plug is your protection against
electrical shock. Plug it into a
standard, three-hole, grounded,
outlet. If cord needs replacing,
use only a cord with a three-
prong, grounding plug.
CAUTION: Label all wires
prior to disconnection when
servicing controls. Wiring errors
can cause improper and danger-
ous operation.
CAUTION: Do not plug power
cord into electrical outlet until
installation is complete.
Grounded
Outlet
Figure 20 - Grounding Plug
TO TURN OFF GAS
TO APPLIANCE
1. Turn control knob clockwise to the
OFF position.
2. Turn off all electric power to the appliance
if service is to be performed.
2. Close equipment shutoff valve (see Figure
15, page 13).
THERMOSTAT CONTROL
OPERATION
The thermostatic control used on these
models differs from standard thermostats.
Standard thermostats simply turn on and off
the burner. The thermostat used on this heater
senses the room temperature. At times the
room may exceed the set temperature. If so,
the burner will shut off. The burner will cycle
back on when room temperature drops below
the set temperature. The control knob can be
set to any comfort level between 1 and 5. All
plaques will turn off and on.
Note: The thermostat sensing bulb mea-
sures the temperature of air near the heater
cabinet. This may not always agree with
room temperature (depending on housing
construction, installation location, room size,
open air temperatures, etc.) Frequent use of
your heater will let you determine your own
comfort levels.

www.fmiproducts.com
125325-01A 17
1/2Glass
Height
1/2Glass
Height
Blue
Flame
Yellow
Tipping
1/2Glass
Height
Yellow
Tipping
OPERATION
Continued
Extension Cord
Use extension cord if needed. The cord must
have a three-prong, grounding plug and a
three-hole receptacle. Make sure cord is in good
shape. It must be heavy enough to carry the
current needed. An undersized cord will cause
a drop in line voltage. This will result in loss of
power and overheating. Use a No. 16 AWG cord
for lengths less than 50 feet.
CAUTION: Verify proper op-
eration after servicing.
Operating Blower
The blower is connected to a thermostat. When
Thermostat
Sensor
Switch
Green
White
Green
White
110/115
V.A.C. Blower
Motor
Black Black
Figure 21 - Wiring Diagram for Blower
Accessory
unit heats up, the blower will operate. A few min-
utes after unit cycles off or is turned off, blower
will shut off. Blower will cycle on and off in this
manner. Note: If you have a heater with a ther-
mostat, the heater and blower will not turn off
and on at exactly the same time. Blower cycle
times will vary with heat setting selected.
INSPECTING HEATERS
BURNER FLAME PATTERN
WARNING: If yellow tipping
occurs, your heater could pro-
duce increased levels of carbon
monoxide.
NOTICE: Do not mistake orange
ames with yellow tipping. Dirt
or other ne particles enter the
heater and burn causing brief
patches of orange ame.
Figure 24 shows a correct burner ame pattern.
Figure 25 shows an incorrect burner ame pat-
tern. The incorrect burner ame pattern shows
yellow tipping of the ame. It also shows the
ame higher than 1/2 the glass panel height.
If burner ame pattern is incorrect, as shown
in Figure 25
• turn heater off (see To Turn Off Gas to Ap-
pliance, page 16)
• see Troubleshooting, page 19
Check pilot ame pattern and burner ame
patterns often.
PILOT FLAME PATTERN
Figure 22 shows a correct pilot ame pattern.
Figure 23 shows an incorrect pilot ame pat-
tern. The incorrect pilot ame is not touching the
thermocouple. This will cause the thermocouple
to cool. When the thermocouple cools, the
heater will shut down.
If pilot ame pattern is incorrect, as shown
in Figure 23
• turn heater off (see To Turn Off Gas to Ap-
pliance, page 16)
• see Troubleshooting, page 19
Note: The pilot ame on natural gas units will
have a slight curve, but ame should be
blue and have no yellow or orange color.
Thermocouple Pilot Burner
Pilot Burner
Thermocouple
Blue Flame
Yellow Flame
Figure 22 - Correct Pilot Flame Pattern
Figure 23 - Incorrect Pilot Flame Pattern
Figure 24 - Correct Burner Flame Pattern
Figure 25 - Incorrect Burner Flame Pattern
1/2Glass
Height
1/2Glass
Height
Blue
Flame
Yellow
Tipping
1/2Glass
Height
Yellow
Tipping

www.fmiproducts.com 125325-01A18
WARNING: Failure to keep
the primary air opening(s) of
the burner(s) clean may result in
sooting and property damage.
ODS/PILOT AND BURNER
Use a vacuum cleaner, pressurized air or
small, soft bristled brush to clean.
BURNER PILOT AIR INLET
The primary air inlet holes allow the proper
amount of air to mix with the gas. This pro-
vides a clean burning ame. Keep these holes
clear of dust, dirt and lint. Clean these air inlet
holes prior to each heating season. Blocked
air holes will create soot. We recommend that
you clean the unit every three months during
operation and have heater inspected yearly
by a qualied service person.
CLEANING AND MAINTENANCE
WARNING: Turn off heater
and let cool before cleaning.
CAUTION: You must keep
control areas, burner and circu-
lating air passageways of heater
clean. Inspect these areas of
heater before each use. Have
heater inspected yearly by a
qualied service person. Heater
may need more frequent clean-
ing due to excessive lint from
carpeting, bedding material, pet
hair, etc.
We also recommend that you keep the burner
tube and pilot assembly clean and free of dust
and dirt. To clean these parts we recommend
using compressed air no greater than 30 PSI.
Your local computer store, hardware store or
home center may carry compressed air in a
can. If using compressed air in a can, please
follow the directions on the can. If you don’t
follow directions on the can, you could dam-
age the pilot assembly.
1. Shut off unit, including pilot. Allow unit to
cool for at least thirty minutes.
2. Inspect burner, pilot and primary air inlet
holes on orice holder for dust and dirt
(see Figure 26).
3. Blow air through the ports/slots and holes
in the burner.
4. Never inset objects into the pilot tube.
5. Blow air into the primary air holes on the
orice holder.
Clean pilot assembly also. A yellow tip on the
pilot ame indicates dust and dirt in the pilot
assembly. There is a small pilot air inlet hole
about 2" from where the pilot ame comes out
of the pilot assembly (see Figure 26). With the
unit off, lightly blow air through the air inlet
hole. You may blow through a drinking straw
if compressed air is not available.
Figure 26 - Pilot Inlet Air Hole
Pilot
Assembly
Pilot Air
Inlet Hole
CABINET
Air Passageways
Use pressurized air to clean.
Exterior
Use a soft cloth dampened with a mild soap
and water mixture. Wipe the cabinet to re-
move dust.

www.fmiproducts.com
125325-01A 19
TROUBLESHOOTING
WARNING: Turn off and unplug heater and let cool before servicing.
Only a qualied service person should service and repair heater.
CAUTION: Never use a wire, needle or similar object to clean
ODS/pilot. This can damage ODS/pilot unit.
Note: All troubleshooting items are listed in order of operation.
POSSIBLE CAUSE
1. Ignitor electrode positioned
wrong
2. Ignitor electrode broken
3. Ignitor electrode not con-
nected to ignitor cable
4. Ignitor cable pinched or
wet
5. Broken ignitor cable
6. Bad piezo ignitor
1. Gas supply turned off or
equipment shutoff valve
closed
2. Control knob is not in pilot
position
3. Control knob not fully
pressed in while pressing
ignitor button
4. Air in gas lines when in-
stalled
5. Depleted gas supply (pro-
pane/LP gas)
6. ODS/pilot is clogged
7. Gas regulator setting is not
correct
OBSERVED PROBLEM
When ignitor button is
pressed, there is no spark at
ODS/pilot
When ignitor button is pressed
in, there is a spark at ODS/Pilot
but no ignition
REMEDY
1. Replace pilot assembly
2. Replace pilot assembly
3. Reconnect ignitor cable
4. Free ignitor cable if pinched
by any metal or tubing. Keep
ignitor cable dry
5. Replace ignitor cable
6. Replace piezo ignitor
1. Turn on gas supply or open
equipment shutoff valve
2. Turn control knob to pilot
position
3. Turn to PILOT/IGN posi-
tion. Fully press in control
knob while pressing ignitor
button
4. Continue holding down
control knob. Repeat ignit-
ing operation until air is
removed
5. Contact local propane/LP
gas company
6. Clean ODS/pilot (see Clean-
ing and Maintenance, page
18) or replace ODS/pilot
assembly
7. Replace gas regulator

www.fmiproducts.com 125325-01A20
TROUBLESHOOTING
Continued
OBSERVED PROBLEM
ODS/pilot lights but flame
goes out when control knob
is released
Burner does not light after
ODS/pilot is lit
Delayed ignition of burner
Burner backring during com-
bustion
REMEDY
1. Press in control knob fully
2. After ODS/pilot lights, keep
control knob pressed in 30
seconds
3. Fully open equipment shut-
off valve
4. A) Contact local natural or
propane/LP gas company
B) Clean ODS/pilot (see
Cleaning and Maintenance,
page 18) or replace ODS/
pilot assembly
5. Hand tighten until snug,
then tighten 1/4 turn more
6. Replace pilot assembly
7. Replace control valve
1. Clean burner (see Cleaning
and Maintenance, page 18)
or replace burner orice
2. Contact local natural or
propane/LP gas company
1. Contact local natural or
propane/LP gas company
2. Clean burner (see Cleaning
and Maintenance, page 18)
or replace burner orice
1. Clean burner (see Cleaning
and Maintenance, page
18)
2. Replace burner
3. Replace gas regulator
POSSIBLE CAUSE
1. Control knob not fully
pressed in
2. Control knob not pressed in
long enough
3. Equipment shutoff valve not
fully open
4. Pilot flame not touching
thermocouple, which al-
lows thermocouple to cool,
causing pilot ame to go
out. This problem could be
caused by one or both of
the following:
A) Low gas pressure
B) Dirty or partially clogged
ODS/pilot
5. Thermocouple connection
loose at control valve
6. Thermocouple damaged
7. Control valve damaged
1. Burner orice clogged
2. Inlet gas pressure is too
low
1. Manifold pressure is too
low
2. Burner orice clogged
1. Burner orice is clogged or
damaged
2. Damaged burner
3. Gas regulator defective