Desa RH10PT Quick start guide

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WARNING: If the information in this manual is not fol-
lowed 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.
MODELS REM10PT AND RH10PT
10,000 Btu/Hr Thermostatically-Controlled Heater
BLUE FLAME VENT-FREE PROPANE/LP GAS HEATER
OWNER’S OPERATION AND INSTALLATION MANUAL

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2
WARNING: Improper installation, adjustment, altera-
tion, service or maintenance can cause injury or prop-
erty damage. Refer to this manual for correct installation
and operational procedures. For assistance or addi-
tional 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. Provi-
sions for adequate combustion and ventilation air must
be provided. Refer to Air for Combustion and Ventilation
section on page 5 of this manual.
This appliance is only for use with the type of gas indi-
cated on the rating plate. This appliance is not convert-
ible for use with other gases.
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.
TABLE OF CONTENTS
Safety Information ............................................... 3
Local Codes ........................................................ 4
Unpacking ........................................................... 4
Product Identification ........................................... 5
Product Features ................................................. 5
Propane/LP Supply .............................................. 5
Installation ........................................................... 5
Operating Heater ................................................11
Inspecting Heater .............................................. 12
Cleaning and Maintenance ................................ 13
Troubleshooting ................................................. 14
Storage .............................................................. 17
Specifications .................................................... 17
Service Hints ..................................................... 17
Technical Service .............................................. 17
Service Publications .......................................... 17
Accessories ....................................................... 17
Replacement Parts ............................................ 17
Illustrated Parts Breakdown and Parts List ....... 18
Warranty Information ...........................Back Cover

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110373-01E 3
SAFETY INFORMATION
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 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.
Propane/LP Gas: Propane/LP gas is a fuel gas.
Fuel gases are odorless. An odor-making agent
is added to fuel gases. The odor helps you detect
a fuel gas leak. However, the odor added to fuel
gas can fade. Fuel gas may be present even though
no odor exists.
Make certain you read and understand all warn-
ings. Keep this manual for reference. It is your
guide to safe and proper operation of this heater.
WARNING: Any change to
this heater or its controls can
be dangerous.
WARNING: Do not use a
blower insert, heat exchanger
insert or other accessory not ap-
proved for use with this heater.
WARNING: If the recreational
or commercial enclosure does
not have a window or roof vent,
DO NOT USE THIS HEATER
inside.
This heater should be inspected
before each use. Frequent clean-
ing may be required. The control
compartments, burners and cir-
culating air passageways of the
heater must be kept clean.
Due to high temperatures, the
appliance should be located out
of traffic and away from combus-
tible materials.
Children and adults should be
alerted to the hazard of high
surface temperature and should
stay away to avoid burns or
clothing ignition.
Do not place clothing or other
flammable material on or near
the appliance. Never place any
objects on the heater.
Heater will remain hot for a time
after shutdown. Allow surface to
cool before touching.
Young children should be care-
fully supervised when they are
near the heater.
Any safety screen or guard
removed for servicing the ap-
pliance must be replaced prior
to operating the heater.
Keep the appliance area clear
and free from combustible ma-
terials, gasoline and other flam-
mable vapors and liquids.

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1. Install and use heater with care. Follow all
local ordinances and codes. In the absence
of local ordinances and codes, refer to the
Standard for Storage and Handling of Lique-
fied Petroleum Gas, ANSI/NFPA 58 and the
Natural Gas Installation Code, CAN/CGA
B149.2. This instructs on the safe storage and
handling of propane/LP gases.
2. This appliance is only for use with the type
of gas indicated on the rating plate. This ap-
pliance is not convertible for use with other
gases.
3. This heater may be used in a recreational
enclosure or temporary construction work
enclosure with a remote refillable propane/LP
cylinder ONLY when the cylinder is located
outdoors and the heater is used with the hose
kit #LPA3090 (included with this heater).
NEVER bring a refillable propane/LP cylinder
indoors. A fire or explosion can occur causing
property damage, serious injury or death.
4. Use only the hose and factory preset regulator
provided with the heater. Use only replacement
pressure regulators and hose assemblies speci-
fied in this manual. See Accessories, page 17.
5. Inspect the hose before each use of the heater.
If it is evident there is excessive abrasion or
wear or the hose is cut, it must be replaced
prior to the heater being put into operation.
Use replacement hose assembly kit #LPA3090
(see Accessories, page 17).
6. Use only propane gas set up for vapor with-
drawal.
7. This heater shall not be installed in a bedroom
or bathroom.
8. This heater needs fresh, outside air ventilation
to run properly. This heater has an Oxygen
Depletion Sensing (ODS) safety shutoff sys-
tem. The ODS shuts down the heater if not
enough fresh air is available. You must provide
a minimum 10 square inches of ventilation air
for adequate combustion.
9. If heater shuts off, do not relight until you
provide fresh, outside air. If heater keeps
shutting off, have it serviced.
10. Keep all air openings in front and bottom of
heater clear and free of debris. This will insure
enough air for proper combustion.
SAFETY INFORMATION
Continued
11. 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.
12. Turn off and let cool before servicing. Only
a qualified service person should service and
repair heater.
13. Operating heater above elevations of 4,500
feet could cause pilot outage.
14. Turn off propane/LP supply when not in use.
15. Check heater for damage before each use. Do
not use a damaged heater.
16. Do not alter heater. Keep heater in its original
state.
17. Do not use heater if altered.
18. This heater can only be used in a recreational
or commercial enclosure with a window or
roof vent. This heater is not for outdoor use.
19. Before using the heater provide adequate
ventilation. An area of 10 square inches of
opening of a window or roof vent is needed
for adequate combustion and ventilation air.
LOCAL CODES
Install and use heater with care. Follow all lo-
cal codes. In the absence of local codes, use the
latest edition of National Fuel Gas Code, ANSI
Z223.1/NFPA 54*.
*Available from:
American National Standards Institute, Inc.
1430 Broadway
New York, NY 10018
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269
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, promptly return to dealer
where you bought heater.

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110373-01E 5
PRODUCT
IDENTIFICATION
PRODUCT FEATURES
SAFETY PILOT
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.
PIEZO IGNITION SYSTEM
This heater has a piezo ignitor. This system re-
quires no matches, batteries or other sources to
light heater.
PROPANE/LP SUPPLY
Propane/LP gas and propane/LP tank(s) are to be
furnished by the user. The propane/LP cylinder
to be used must be constructed and marked in
accordance with the specifications for the pro-
pane/LP gas cylinders of the U.S. Department of
Transportation (DOT).
Use this heater only with a propane/LP vapor
withdrawal supply system. See Chapter 5 of the
Standard for Storage and Handling of Liquefied
Petroleum Gas, ANSI/NFPA 58 and/or CAN/CGA
B149.2. Your local library or fire department will
have this booklet.
Figure 1 - Vent-Free Propane/LP Gas
Heater
Heater
Cabinet
Grill
Guard
Glass
Panel
Front
Panel
Control
Knob
Ignitor Button
Regulator Hose
The amount of propane/LP gas ready for use from
propane/LP tanks varies. Two factors decide this
amount:
1. The amount of propane/LP gas in tank(s)
2. The temperature of tank(s)
This heater is designed for use with a 20 or 40
pound refillable propane/LP cylinder when used
as a self contained heating system (with hose and
regulator). Larger tanks may be used if installed
in a permanent gas supply system.
The propane/LP cylinder used must include a
collar to protect the cylinder valve and a listed
overfilling prevention device (OPD).
INSTALLATION
CHECK GAS TYPE
Use only propane/LP gas. If your gas supply is not
propane/LP, do not install heater. Call dealer where
you bought heater for proper type heater.
WARNING: This appliance
is equipped for propane/LP
gas. Field conversion is not
permitted.
LOCATING HEATER
WARNING: Maintain the mini-
mum clearances shown in Figure
2, page 6. If you can, provide
greater clearances from floor,
ceiling and joining wall.
WARNING: Never install the
heater
• in a bedroom or bathroom
• where curtains, furniture,
clothing or other flammable
objects are less than 36" from
the front, top or sides of the
heater
• as a fireplace insert
• in high traffic areas
• in windy or drafty areas

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CAUTION: This heater cre-
ates warm air currents. These
currents move heat to wall sur-
faces next to heater. Installing
heater next to vinyl or cloth wall
coverings or operating heater
where impurities (such as, but
not limited to, tobacco smoke,
aromatic candles, cleaning flu-
ids, oil or kerosene lamps, etc.) in
the air exist, may discolor walls
or cause odors.
CAUTION: If you install the
heater in a home garage
• heater pilot and burner must
be at least 18" above floor.
• locate heater where moving
vehicle will not hit it.
For convenience and efficiency, install heater
• where there is easy access for operation, inspec-
tion and service
• in coldest part of room
INSTALLATION
Continued
36"
3"
FLOOR
CEILING
Minimum
Minimum To Top Surface
Of Carpeting, Tile Or Other
Combustible Material
6"
Minimum
From
Sides Of
Heater
Right
Side
Left
Side
Figure 2 - Mounting Clearances As
Viewed From Front of Heater
Minimum To
Top Surface
Of Carpeting,
Tile Or Other
Combustible
Material
THERMOSTAT SENSING BULB
The thermostat sensing bulb is located inside the
heater. Do not move this bulb during installation
or operation of the heater.
INSTALLING HEATER TO WALL
Marking Screw Locations
1. Determine where you will locate heater.
WARNING: Maintain mini-
mum clearances shown in Figure
3. If you can, provide greater
clearances from floor and join-
ing wall.
2. Mark two mounting screw locations on wall
(see Figure 3).
Installing Two Mounting Screws
Note: Wall anchors and mounting screws are
in hardware package. The hardware package is
provided with heater.
Figure 3 - Mounting Screw Locations
Mounting
Screw
Locations
8 7/8"
Minimum To
Maintain 6"
Clearance
From Wall
7 3/4"
20 1/4"
Minimum To
Maintain 3"
Clearance
From Floor
FLOOR
JOINING WALL
Attaching To Wall Stud Method
For attaching mounting screw to wall stud
1. Drill hole at marked location using 9/64" drill
bit.
2. Insert mounting screw into wall stud.
3. Tighten screw until 1/16" space (thickness of
penny) is between screwhead and wall.
Attaching To Wall Anchor Method
Follow instructions below to attach mounting
screws 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 1/4" deep.
2. Fold wall anchor (see Figure 4, page 7).

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110373-01E 7
3. Insert wall anchor (wings first) into hole. Tap
anchor flush to wall.
4. For thin walls (1/2" or less), insert red key
into wall anchor. Push red key to “pop” open
anchor wings (see Figure 5).
IMPORTANT: Do not hammer key! For thick
walls (over 1/2" thick) or solid walls, do not
pop open wings.
5. Tighten two screws until 1/16" space (thick-
ness of penny) is between screwheads and wall
(see Figure 6).
INSTALLATION
Continued
Figure 4 - Folding Anchor
Figure 5 - Popping Open Anchor Wings
For Thin Walls
Thin Walls
(1/4" to
1/2" thick)
Figure 6 - Tightening Anchors
1/16"
Space
Thin or Thick
Wall (thick
wall shown)
Solid
Wall
Figure 7 - Location Of Keyhole Slots On
Back Panel Of Heater
Keyhole Slots
Figure 8 - Removing Front Panel Of
Heater
Placing Heater On Mounting Screws
1. Locate two keyhole slots on back panel of
heater (see Figure 7).
2. Place large openings of slots over screwheads.
Slide heater down until screws are in small
portion of slots.
Removing Front Panel Of Heater
1. Remove two screws near bottom corners of
front panel.
2. Lift straight up on grill guard until it stops.
Grill guard will slide up about 1/4".
3. Pull bottom of front panel forward, then
down.
Installing Bottom Mounting Screw
1. Locate bottom mounting hole. This hole is
near bottom on back panel of heater (see
Figure 9).
2. Mark screw location on wall.
3. Remove heater from wall.
4. If installing bottom mounting screw into hol-
low or solid wall, install wall anchor. Follow
steps 1 through 5 under Attaching To Wall
Anchor Method, page 6. If installing bottom
mounting screw into wall stud, drill hole at
marked location using 9/64" drill bit.
5. Replace heater on wall.
6.
Insert bottom anchor screw through back panel
into bottom anchor or drilled hole (see Figure 9).
7. Tighten screw until heater is firmly 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 pages 8 through 10).
Figure 9 - Installing Bottom Mounting
Screw

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INSTALLATION
Continued
CONNECTING TO PORTABLE
CYLINDER GAS SUPPLY
WARNING: Review and un-
derstand the warnings in the
Safety Information section, page
3. They are needed to safely op-
erate this heater. Follow all local
codes when using this heater.
WARNING: Test all gas piping
and connections for leaks after
installation or servicing. Never
use an open flame to check for
a leak. Apply a noncorrosive
leak detection fluid to all joints.
Bubbles forming show a leak.
Correct all leaks at once.
WARNING: Use pipe joint
sealant that is resistant to liquid
petroleum (LP) gas.
Never bring a refillable pro-
pane/LP cylinder indoors. A fire
or explosion can occur causing
property damage, serious injury
or death.
IMPORTANT: You must use a propane/LP gas
supply cylinder that is compatible with the connec-
tion device provided with the hose and regulator.
1. Remove 90° gas fitting from hardware bag.
2. Apply pipe joint sealant lightly to male NPT
threads (see Figure 10). This will prevent excess
sealant from going into pipe. Excess sealant in
pipe could result in clogged heater valves.
3. Hold gas pressure regulator with wrench when
connecting the 90° gas fitting. Do not over
tighten connection to regulator. The regulator
body could be damaged.
4. Provide propane/LP supply system (see Pro-
pane/LP Supply, page 5).
5. Connect fuel gas fitting on hose/regulator assem-
bly to propane/LP tank(s). Turn fuel gas fitting
counterclockwise into threads on tank. Tighten
firmly using a wrench. IMPORTANT: Position
regulator so that hose leaving the regulator is
in a horizontal position (see Figure 11). This
places the regulator vent in the proper position
to protect it from the weather.
6. Connect hose to heater inlet. Tighten firmly
using a wrench. You must use the regulator
supplied with heater.
7. Open propane/LP supply valve on propane/LP
tank(s) slowly. Note: If not opened slowly,
excess-flow check valve on propane/LP tank
may stop gas flow. If this happens, close pro-
pane/LP supply valve and open again slowly.
8. Check all connections for leaks. Apply a noncor-
rosive leak detection fluid to gas joints. Bubbles
forming show a leak that must be corrected.
9. Close propane/LP supply valve.
Propane/LP
Tank
Propane/LP
Supply Valve
Regulator
Hose To
Heater
Fuel Gas
Fitting
Figure 11 - Regulator Position
Figure 10 - Gas Connection
Heater
Cabinet
Pressure
Regulator
Elbow
Hose To
Regulator
Hose Fitting
Apply Sealant To
This End Only
CONNECTING TO PERMANENT
GAS SUPPLY
WARNING: This appliance
requires a 3/8" NPT (National
Pipe Thread) inlet connection to
the pressure regulator.
WARNING: A qualified ser-
vice person must connect heater
to gas supply. Follow all local
codes.

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110373-01E 9
INSTALLATION
Continued
CAUTION: Never connect heater
directly to the propane/LP supply.
This heater requires an external
regulator (not supplied). Install
the external regulator between the
heater and propane/LP supply.
Installation Items
Before installing heater, make sure you have the
items listed below.
• external regulator (supplied by installer)
• piping (check local codes)
• sealant (resistant to propane/LP gas)
• equipment shutoff valve *
• ground joint union
• test gauge connection *
• sediment trap
• tee joint
• pipe wrench
* A CSA design-certified equipment shutoff valve
with 1/8" NPT tap is an acceptable alternative to
test gauge connection. The optional CSA design-
certified equipment shutoff valve can be purchased
from your dealer. See Accessories, page 17.
If installing to a fixed fuel piping system, the
installation must conform with local codes or, in
the absence of local codes, with the National Fuel
Gas Code, ANSI Z223.1.
If the heater will be connected to a permanent
gas source, the installer must supply an external
regulator. The external regulator will reduce in-
coming gas pressure. You must reduce incoming
gas pressure to between 11" and 14" of water. If
you do not reduce incoming gas pressure, heater
regulator damage could occur. Install the external
regulator with the vent pointing down as shown
in Figure 12. Pointing the vent down protects it
from freezing rain or sleet.
CAUTION: Use only new,
black iron or steel pipe. Inter-
nally-tinned copper tubing may
be used in certain areas. Check
your local codes. Use pipe of
large enough diameter to allow
proper gas volume to heater. If
pipe is too small, undue loss of
volume will occur.
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 13).
IMPORTANT: Install an equipment shutoff valve
in an accessible location. The equipment shutoff
valve is for turning on or shutting off the gas to
the appliance.
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.
WARNING: Use pipe joint
sealant that is resistant to liquid
petroleum (LP) gas.
Figure 12 - External Regulator With Vent
Pointing Down
External
Regulator
Propane/LP
Supply Tank
Vent
Pointing
Down
Tee Joint
Reducer
Bushing to
1/8" NPT
1/8" NPT
Plug Tap
Test Gauge
Connection*
Heater
Cabinet
Pressure
Regulator
Tee
Joint
Pipe
Nipple
Cap
Ground
Joint
Union
3/8" NPT
Pipe
Nipple**
Equipment
Shutoff Valve*
From
External
Regulator
(11" W.C.
to 14" W.C.
Pressure)
Figure 13 - Gas Connection
Sediment
Trap
3"
Min.
* 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 17.
** The 90º elbow on the regulator is removed and
the 3/8" NPT pipe nipple is installed in its place.

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10
INSTALLATION
Continued
Figure 14 - Equipment Shutoff Valve
Open
Closed
Equipment
Shutoff Valve
CHECKING GAS CONNECTIONS
FOR PERMANENT GAS SUPPLY
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 flame to check for a leak.
Apply a noncorrosive leak detec-
tion fluid to all joints. Bubbles
forming show a leak. Correct all
leaks at once.
CAUTION: Make sure exter-
nal regulator has been installed
between propane/LP supply and
heater. See guidelines under
Connecting to Permanent Gas
Supply, page 8.
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 equipment
shutoff valve from gas supply piping system.
Pressures in excess of 1/2 psig will damage
heater regulator.
2. Cap off open end of gas pipe where equipment
shutoff valve was connected.
3. Pressurize supply piping system by opening
propane/LP supply tank valve or using com-
pressed air.
4. Check all joints of gas supply piping system.
Apply a noncorrosive leak detection fluid 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 fittings for
leaks.
Test Pressures Equal To or Less Than
1/2 PSIG (3.5 kPa)
1. Close equipment shutoff valve (see Figure 14).
2. Pressurize supply piping system by either
opening propane/LP supply tank valve or
using compressed air.
3. Check all joints from supply tank to equip-
ment shutoff valve (see Figure 15). Apply a
noncorrosive leak detection fluid 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 14).
2. 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 15). Apply
a noncorrosive leak detection fluid to all joints.
Bubbles forming show a leak.
5. Correct all leaks at once.
6. Light heater (see Lighting Instructions, page
11). Check all other internal joints for leaks.
7. Turn off heater (see To Turn Off Gas to Appli-
ance, page 12).
8. Replace front panel.
Propane/LP
Supply
Tank
Equipment
Shutoff
Valve
Control Valve Location
Figure 15 - Checking Gas Joints