Desa RM50PVA User Manual
PROPANE
CONSTRUCTION
HEATER
OWNER’S MANUAL
Model: RM50PVA
IMPORTANT: Read and understand this manual before assembling, starting, or
servicing heater. Improper use of heater can cause serious injury. Keep this
manual for future reference.
GENERAL HAZARD WARNING:FAILURE TO COMPLY WITH
THE PRECAUTIONS AND INSTRUCTIONS PROVIDED WITH THIS
HEATER, CAN RESULT IN DEATH, SERIOUS BODILY INJURY
AND PROPERTY LOSS OR DAMAGE FROM HAZARDS OF FIRE,
EXPLOSION, BURN, ASPHYXIATION, CARBON MONOXIDE POISONING, AND/OR ELECTRICAL SHOCK.
ONLY PERSONS WHO CAN UNDERSTAND AND FOLLOW THE
INSTRUCTIONS SHOULD USE OR SERVICE THIS HEATER.
IF YOU NEED ASSISTANCE OR HEATER INFORMATION SUCH
AS AN INSTRUCTIONS MANUAL, LABELS, ETC. CONTACT THE
MANUFACTURER.
50,000 BTU/HR
PROPANE CONSTRUCTION HEATER
SAFETY
INFORMATION
WARNINGS
WARNING ICON G 001
WARNING: FIRE, BURN, INHALATION, AND EXPLOSION
HAZARD. KEEP SOLID COMBUSTIBLES, SUCH AS BUILDING MATERIALS, PAPER OR CARDBOARD, A SAFE DISTANCE
AWAY FROM THE HEATER AS
RECOMMENDED BY THE INSTRUCTIONS. NEVER USE THE
HEATER IN SPACES WHICH DO
OR MAY CONTAIN VOLATILE OR
AIRBORNE COMBUSTIBLES, OR
PRODUCTS SUCH AS GASOLINE, SOLVENTS, PAINT THINNER, DUST PARTICLES OR UNKNOWN CHEMICALS.
WARNING: NOT FOR HOME
OR RECREATIONAL VEHICLE
USE.
The heater is designed for use as a construction
heater in accordance with ANSI Z83.7/CGA
2.14. Other standards govern the use of fuel
gases and heating products for specific uses.
Your local authority can advise you about
these. The primary purpose of construction
heaters is to provide temporary heating of
buildings under construction, alteration or repair. Properly used, the heater provides safe
economical heating. Products of combustion
are vented into the area being heated.
We cannot foresee every use which may be
made of our heaters. CHECK WITH
YOUR LOCAL FIRE SAFETY AUTHORITY IF YOU HAVE QUESTIONS
ABOUT HEATER USE.
Other standards govern the use of fuel gases
and heat producing products for specific
uses. Your local authorities can advise you
about these.
Carbon Monoxide Poisoning: Some
people are more affected by carbon monoxide than others. Early signs of carbon monoxide poisoning resemble the flu, with headaches, dizziness, and/or nausea. If you have
these signs, the heater may not be working
properly. Get fresh air at once! Check for
proper ventilation and have heater serviced.
Propane Gas: Propane gas is odorless.
An odor-making agent is added to propane
gas. The odor helps you detect a propane gas
leak. However, the odor added to propane
gas may fade. Propane 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.
• 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 Liquefied 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 gases.
• Use only the electrical voltage and frequency specified on model plate.
• The electrical connections and grounding of the heater shall follow the National
Electric Code, ANSI/NFPA 70, or Canadian Electrical Code, part 1.
• Electrical grounding instructions — This
appliance is equipped with a three-prong
(grounding) plug for your protection
against shock hazard and should be
plugged directly into a properly grounded
three-prong receptacle.
• Use only a three-prong, grounded extension cord.
• Use only the hose and factory preset
regulator provided with the heater.
• Use only propane gas set up for vapor
withdrawal.
• Provide adequate ventilation. Before using heater, provide at least a 1.5-squarefoot opening of fresh, outside air.
• Approved by the New York City Fire
Department under Certificate of Approval #4953. To be used only at construction site with applicable New York
City codes, regulations, rules, directives,
permits, etc.
• This product has been approved for use
in the Commonwealth of Massachusetts.
• This heater produces carbon monoxide,
which is listed by the State of California as
a reproductive toxin under Proposition 65.
• For indoor use only. Do not use heater
outdoors.
2
• Do not use heater in occupied dwellings
or in living or sleeping quarters.
• Do not use heater below ground level.
Propane gas is heavier than air. If a leak
occurs, propane gas may sink to the lowest possible level.
• Keep appliance area clear and free from
combustible materials, gasoline, paint
thinner, and other flammable vapors and
liquids. Do not use heater in areas with
high dust content.
• Minimum heater clearances from combustibles:
Outlet: 6 Ft. Sides: 2 Ft.
Top: 6 Ft. Rear: 2 Ft.
• Keep heater at least six feet from propane tank(s). Do not point heater at propane tank(s) within 20 feet.
• Keep propane tank(s) below 100° F.
• Check heater for damage before each use.
Do not use a damaged heater.
• Check hose before each use of heater. If
highly worn or cut, replace before using
heater.
• Locate heater on stable and level surface
if heater is hot or operating.
• Not intended for use on finished floors.
• Never block air inlet (rear) or air outlet
(front) of heater.
• Keep heater away from strong drafts,
water spray, rain, or dripping water.
• Do not leave heater unattended.
• Keep children and animals away from
heater.
• Never move, handle, or service a hot,
operating, or plugged-in heater. Severe
burns may result. Wait 20 minutes after
turning heater off.
• T o prevent injury, wear gloves when handling heater.
• Never attach duct work to heater.
• Do not alter heater. Keep heater in its
original state.
• Do not use heater if altered.
• Turn off propane supply and unplug
heater when not in use.
• Use only original replacement parts. This
heater must use design-specific parts. Do
not substitute or use generic parts. Improper replacement parts could cause
serious or fatal injuries.
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OWNER’S MANUAL
PRODUCT
IDENTIFICATION
Hot Air Outlet
(Front)
Heater Base
Piezo
Ignitor
Button
Automatic
Control Valve
Knob
Hose /
Regulator
Assembly
Figure 1 - 50,000 BTU/Hr Model
Shell
Fan Guard
Valve
Inlet
Handle
Motor
Power
Cord
UNPACKING
1. Remove all packing items applied to
heater for shipment. Keep plastic cover
caps (attached to inlet connector and
hose/regulator assembly) for storage.
2. Remove all items from carton.
3. Check all items for shipping damage.
If heater is damaged, promptly inform
dealer where you bought heater.
PROPANE SUPPLY
Propane gas and propane tank(s) are to be
furnished by the user.
Use this heater only with a propane 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.
The amount of propane gas ready for use
from propane tanks varies. Two factors decide this amount:
1. The amount of propane gas in tank(s)
2. The temperature of tank(s)
This heater is designed to operate with a
minimum 20-pound propane tank. You may
need two or more tanks or one larger tank in
colder weather. Use a 100-pound tank for
longer operation or in very cold weather.
Less gas is vaporized at lower temperatures.
Your local propane gas dealer will help you
select the proper supply system. The minimum surrounding air temperature rating for
each heater is -20°F (-29°C).
Average Number Of
Temperature (°F) Tanks
At Tank Location (100-pound)
40° 1
32° 1
20° 1
10° 1
0° 1
-10° 2
-20° 2
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3
50,000 BTU/HR
PROPANE CONSTRUCTION HEATER
THEORY OF
OPERATION
THE FUEL SYSTEM
The hose/regulator assembly attaches to the
propane gas supply. This provides fuel to
the heater.
THE AIR SYSTEM
The motor turns the fan. The fan pushes air
into and around the combustion chamber.
This air is heated and provides a stream of
clean, hot air.
THE IGNITION SYSTEM
The piezo ignitor lights the burner.
THE AUTOMATIC CONTROL
SYSTEM
This system causes the heater to shut down
if the flame goes out.
ASSEMBLY
Combustion Chamber
Clean
Heated Air
Out
(Front)
Air For Combustion Air For Heating
Figure 2 - Cross Section Operational View
Flat Side Facing Up
Nut Clip
Fan
Motor
Cool Air
In (Back)
Hose/
Regulator
Assembly
Screws
1. Remove screw from top of fan guard.
Discard screw.
Remove
Screw
Figure 3 - Removing Screw from Top of
Fan Guard
2. Insert nut clip (provided with handle)
with flat side facing up through slot in
top of shell. Align holes in nut clip with
screw hole behind slot in top of shell.
(see Figure 4).
Shell
Slot
Figure 4 - Installing Nut Clip
3. Place handle over hole and clip. Insert
two screws (provided with handle)
through handle and tighten into shell.
Make sure rear screw goes through
shell and into fan guard. Tighten screws
firmly.
Handle
Nut Clip
Rear of
Heater
Figure 5 - Attaching Handle
4
105338
OWNER’S MANUAL
INSTALLATION
WARNING: Review and un-
derstand the warnings in the
Safety Information
2. They are needed to safely operate 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 mixture of
liquid soap and water to all joints.
Bubbles forming show a leak.
Correct all leaks at once.
1. Provide propane supply system (see
Propane Supply, page 3).
2. Connect fuel gas fitting on hose/regulator assembly to propane tank(s). Turn
fuel gas fitting counterclockwise into
threads on tank. Tighten firmly using a
wrench.
lator so that hose leaving the regulator
is in a horizontal position (see Figure
6). This places the regulator vent in the
proper position to protect it from the
weather.
3. Connect hose to valve inlet. Tighten
firmly using a wrench. You must use
the regulator supplied with heater.
4. Open propane supply valve on propane
tank(s) slowly.
slowly, excess-flow check valve on propane tank may stop gas flow. If this
happens, close propane supply valve
and open again slowly.
5. Check all connections for leaks. Apply
mixture of liquid soap and water to gas
joints. Bubbles forming show a leak
that must be corrected.
6. Close propane supply valve.
IMPORT ANT:
section, page
Position regu-
Note:
If not opened
WARNING: Never use an open
flame to check for a leak. Apply a
mixture of liquid soap and water
to all joints. Bubbles forming
show a leak that must be corrected. Correct all leaks at once.
Regulator
Propane
Supply
Valve
Propane
Tank
Figure 6 - Regulator Position
Knob
Valve Inlet
Figure 7 - Hose and Inlet Connector
Hose
Hose
Fuel Gas
Fitting
VENTILATION
WARNING: Provide at least a
1.5 square foot opening of fresh,
outside air while running heater.
If proper fresh, outside air ventilation is not provided, carbon
monoxide poisoning can occur.
Provide proper fresh, outside air
ventilation before running heater.
105338
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