Desa ROPANE CONSTRUCTION HEATERS User manual

!
GENERAL HAZARD WARNING:
FAILURE TO COMPLY WITH THE PRECAUTIONS AND INSTRUC-
TIONS 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 IN-
STRUCTIONS SHOULD USE OR SERVICE THIS HEATER.
IFYOUNEEDASSISTANCEORHEATERINFORMATIONSUCHASAN
INSTRUCTIONSMANUAL,LABELS,ETC.CONTACTTHEMANUFAC-
TURER.
Heater Sizes: 80,000 150,000 BTU/Hr
PROPANE
CONSTRUCTION
HEATERS
OWNER’SMANUAL
150 LP SIDE PV 017
45 & 80 LP SIDE PV 0016
®
IMPORTANT
Read and understand this manual before assembling, starting, or servicing heater. Im-
proper use of heater can cause serious injury. Keep this manual for future reference.

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Safety Information......................................................................... 2
Product Identification .................................................................... 4
Unpacking......................................................................................5
Theory of Operation ......................................................................5
Propane Supply..............................................................................6
Installation .....................................................................................6
Ventilation .....................................................................................7
Operation .......................................................................................8
Storage ........................................................................................... 8
Maintenance ..................................................................................9
Preventative Maintenance Schedule..............................................9
Service Procedures ........................................................................10
Specifications ................................................................................ 12
Wiring Diagrams ...........................................................................13
Accessories ....................................................................................15
Technical Service .......................................................................... 15
Service Publications ......................................................................15
Replacement Parts .........................................................................15
Warranty and Repair Service.........................................................Back Cover
SECTION PAGE
CONTENTS
Safety Information continues on next page
The heater is designed and approved for use as a construction heater under ANSI
Z83.7.Theprimarypurpose ofconstructionheatersistoprovide temporaryheating
of buildings under construction, alteration or repair, and to provide temporary
emergency heat. 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.
Otherstandardsgoverntheuseoffuelgasesandheatproducingproductsforspecific
uses. Your local authorities can advise you about these.
Carbon Monoxide Poisoning: Some people are more affected by carbon
monoxidethanothers. Earlysigns ofcarbon monoxide poisoningresemble theflu,
with headaches, dizziness, and/or nausea. If you have these signs, the heater may
not be working properly. Get fresh air at once! Have heater serviced.
!
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 IN-
STRUCTIONS. NEVER USE THE HEATER IN SPACES WHICH
DO OR MAY CONTAIN VOLATILE OR AIRBORNE COMBUS-
TIBLES, OR PRODUCTS SUCH AS GASOLINE, SOLVENTS,
PAINT THINNER, DUST PARTICLES OR UNKNOWN CHEMI-
CALS.
!
WARNING
NOT FOR HOME OR RECREATIONAL VEHICLE USE.
!
WARNINGS
SAFETY
INFORMATION

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SAFETY
INFORMATION
Continued
!
WARNINGS
Propane Gas: Propane gas is odorless. An odor-making agent is added to
propanegas.Theodorhelpsyoudetectapropanegasleak.However,theodoradded
to propane gas can 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.
• For indoor use only. Provide adequate ventilation.
• Use only in well vented areas. Before using heater, provide at least a three-
square-foot opening of fresh, outside air for each 100,000 BTU/Hr of rating.
This heater produces carbon monoxide, which is listed by the State of Califor-
nia as a reproductive toxin under Proposition 65.
• Do not use heater outdoors or in occupied dwellings.
• Do not use heater in living or sleeping quarters.
• 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.
• Keep heater away from strong drafts, water spray, rain, or dripping water.
• Install and use heater with care. Follow all local ordinances and codes. In the
absence of local ordinances and codes, refer to ANSI/NFPA 58. This instructs
on the safe storage and handling of propane gases.
• Check heater for damage before each use. Do not use a damaged heater.
• Use only propane gas set up for vapor withdrawal.
• Keep propane tank(s) below 100°F.
• Do not use heater below ground level. Propane gas is heavier than air. If a leak
occurs, propane gas will sink to the lowest possible level.
• Use only the electrical voltage and frequency specified on model plate.
• The electrical connections and grounding of the heater shall follow the Na-
tional Electric Code, ANSI/NFPA 70.
• 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.
• Inspect hose before each use of heater. If highly worn or cut, replace before
using heater. Use the replacement hose assembly specified in this manual.
• Keep heater at least six feet from propane tank(s). Do not point heater at
propane tank(s) within 20 feet.
• Minimum heater clearances from combustibles:
Outlet: 8 Ft. Sides: 2 Ft. Top: 6 Ft. Rear: 2 Ft.
• Locate heater on stable and level surface if heater is hot or running.
• Keep children and animals away from heater.
• Turn off propane supply and unplug heater when not in use.
• When used with thermostat, heater may start anytime.
• Never block air inlet (rear) or air outlet (front) of heater.
• Never move, handle, or service a hot, operating, or plugged-in heater.
• Do not alter heater. Keep heater in its original state.
• Do not use heater if altered.
• Never attach duct work to front or rear of heater.
• 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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PRODUCT
IDENTIFICATION
Generic LP 155 LP-PFA/PV 008B
Hot Air
Outlet
(Front)
Handle
Fan Guard
Upper Shell
On/Off Switch
Power Cord
Hose /Regulator
Assembly
Inlet
Connector
Figure 2 - 150,000 BTU/Hr Model
Generic LP 45 & 80 LP-PFA/PV 008A
Fan Guard
Handle
Lower Shell
Power Cord
Hose /Regulator
Assembly
Inlet
Connector
On/Off Switch
Hot Air Outlet
(Front) Upper Shell
Figure 1 - 80,000 BTU/Hr Model
Lower Shell

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45/80 LP SIDE LP-PFA/OV 001A
Air For Combustion
And Heating Fuel
Combustion
Chamber
DSI
Nozzle
Figure 3 - Cross Section Operational View (80,000 BTU/Hr Model Shown)
Clean
Heated
Air Out
(Front) Cool Air In
(Back)
THEORY OF
OPERATION
The Fuel System: The hose/regulator assembly attaches to the propane gas
supply. The propane gas moves through the solenoid valve and out the nozzle.
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 direct spark ignitor (DSI) sends voltage to the spark
plug/ignitor. The spark plug/ignitor ignites the fuel and air mixture.
The Safety Control System: This system causes the heater to shut down if the
flame goes out.
Fan
Motor
Power
Cord
Hose/Regulator
Assembly
On/Off Switch
Solenoid
Valve
Note: Some parts are located differently on some models.
Spark Plug/Ignitor
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.

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099162
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. 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)
The chart below shows the number of 100 pound tanks needed to run this heater.
Do not operate this product with any tank smaller than 100 pounds.
32°20°10°0°-10°-20°
Number of tanks, 80,000 BTU/Hr 1 1 2 2 3 3
Number of tanks, 150,000 BTU/Hr 2 2 3 3 (Use larger tank)
Temperature (°F) At Tank
Continued
Hose
Regulator
Vent
(pointing down)
POL Fitting
Supply
Valve
Propane
Tank
Figure 4 - Regulator With Vent Pointing Down
Less gas is vaporized at lower temperatures. You may need two or more 100
pound tanks or one larger tank in colder weather. 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).
INSTALLATION
!
WARNING
Review and understand the warnings in the Safety Information
Section, pages 2 and 3. They are needed to safely operate this
heater. Follow all local codes when using this heater.
1. Provide propane supply system (see Propane Supply above).
2. Connect POL fitting on hose/regulator assembly to propane tank(s). Turn POL
fitting counterclockwise into threads on tank. Tighten firmly using
7/8" wrench. IMPORTANT: Tighten regulator with vent pointing down.
Pointing vent down protects regulator from weather damage.
!
WARNING
Test all gas piping and connections for leaks after installing
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.

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Generic LP 45 & 80 LP-PFA/P 023
3. Connect hose to inlet connector. Tighten firmly using a wrench.
IMPORTANT: Extra hose or piping may be used if needed. Install extra hose
or piping between hose/regulator assembly and propane tank. You must use
the regulator supplied with heater.
4. Open propane supply valve on propane tank(s) slowly. Note: If not opened
slowly, excess-flow check valve on propane tank will stop gas flow. If this
happens, close propane supply valve and open again slowly.
5. Check all connections for leaks.
Figure 5 - Hose and Inlet Connector
Hose
Inlet Connector
80,000 BTU/Hr
Model Shown
6. Close propane supply valve.
!
WARNING
Follow the minimum fresh, outside air ventilation require-
ments. If proper fresh, outside air ventilation is not provided,
carbon monoxide poisoning can occur. Provide proper fresh,
outside air ventilation before running heater.
VENTILATION
Example: A 150,000 BTU/Hr heater requires one of the following:
• a two-car garage door raised six inches
• a single-car garage door raised nine inches
• two thirty-inch windows raised twelve inches
Provide a fresh air opening of at least three square feet for each 100,000 BTU/Hr
rating. Provide extra fresh air if more heaters are being used.
!
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. Correct all leaks at once.

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099162
To Start Heater
1. Follow all installation, ventilation and safety information.
2. Locate heater on stable and level surface. Make sure strong drafts do not blow
into front or rear of heater.
3. Plug power cord of heater into a three-prong, grounded extension cord.
Extension cord must be at least six feet long. Extension cord must be UL
listed.
OPERATION
!
WARNING
Review and understand the warnings in the Safety Information
Section, pages 2 and 3. They are needed to safely operate this
heater. Follow all local codes when using this heater.
STORAGE
1. Store propane tank(s) in safe manner. See Chapter 5 of Standard for Storage
and Handling of Liquefied Petroleum Gases, ANSI/NFPA 58. Follow all local
codes.
2. Place plastic cover caps over brass fittings on inlet connector and
hose/regulator assembly.
3. Store in dry, clean, and safe place. Do not store hose/regulator assembly inside
heater combustion chamber.
4. When taking heater out of storage, always check inside of heater. Insects and
small animals may place foreign objects in heater. Keep inside of heater free
from combustible and foreign objects.
Extension Cord Size Requirement
Up to 50 feet long, use 18 AWG rated cord.
51 to 100 feet long, use 16 AWG rated cord.
101 to 200 feet long, use 14 AWG rated cord.
4. Plug extension cord into a 120 volt/60 hertz, three-hole, grounded outlet.
5. Open propane supply valve on propane tank(s) slowly. Note: If not opened
slowly, excess-flow check valve on propane tank will stop gas flow. If this
happens, close propane supply valve and open again slowly.
6. Turn on/off switch to the ON position. Heater will start within twenty seconds.
Note: If heater does not start, turn on/off switch to the OFF position. Wait ten
seconds for safety control to reset, then try again.
To Stop Heater
1. Tightly close propane supply valve on propane tank(s).
2. Wait a few seconds. Heater will burn gas left in supply hoses.
3. Turn on/off switch to the OFF position.
4. Unplug heater.
!
CAUTION
Disconnect heater from propane supply tank(s).

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MAINTENANCE
!
WARNING
Never service heater while it is plugged in, connected to
propane supply, operating, or hot. Severe burns and
electrical shock can occur.
1. Keep heater clean. Clean heater annually or as needed to remove dust and
debris. If heater is dirty or dusty, clean heater with a damp cloth.
2. Inspect heater before each use. Check connections for leaks. Apply mixture of
liquid soap and water to connections. Bubbles forming show a leak. Correct all
leaks at once.
3. Inspect hose/regulator assembly before each use. If hose is highly worn or cut,
replace.
4. Have heater inspected yearly by a qualified service agency.
5. Keep inside of heater free from combustible and foreign objects.
PREVENTATIVE
MAINTENANCE
SCHEDULE
Item
Fan
Air Sensing
Switch
(80,000 BTU/Hr
Model Only)
Spark Plug
(80,000 BTU/Hr
Model Only)
How Often
Clean every 500 hours of
operation or as needed.
Clean every 500 hours of
operation or as needed.
Clean and regap every 500
hours of operation or replace
as needed.
How To
See Fan, page 10.
See Air Sensing
Switch, page 11.
See Spark Plug,
page 11.
!
WARNING
Never service heater while it is plugged in, connected to
propane supply, operating, or hot. Severe burns and
electrical shock can occur.

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LP-PFA/P 019B45/80 Models
FAN CROSS SECTION LP-PFA/P 013
FAN LP-PFA/P 023
SERVICE
PROCEDURES
Upper Shell Removal
1. Remove screws along each
side of heater using 5/16"
nut-driver. These screws
attach upper and lower
shells together.
2. Lift or slide upper shell off.
3. Remove fan guard.
Fan Motor
Figure 7 - Upper Shell Removal,
150,000 BTU/Hr Model
Figure 6 - Upper Shell Removal,
80,000 BTU/Hr Model
Figure 10 - Fan Cross Section
Figure 9 - Fan, Motor Shaft,
and Setscrew Location
80,000 BTU/Hr
Model Shown
Motor shaft
Fan
Setscrew Fan
Figure 8 - Fan Removal and Air Sensing
Switch Location
Air Sensing
Switch
Paddle
(80,000
BTU/Hr
Model
Only)
Paddle
Arm
Hub
Setscrew
Motor
Shaft
!
WARNING
Never service heater while it is plugged in, connected to
propane supply, operating, or hot. Severe burns and
electrical shock can occur.
Fan
IMPORTANT: Remove fan
from motor shaft before
removing motor from heater.
The weight of the motor
resting on the fan could
damage the fan pitch.
1. Remove upper shell (see
above).
2. Use 1/8" hex wrench to
loosen setscrew which
holds fan to motor shaft.
3. Slip fan off motor shaft.
Be careful not to strike air
sensing switch paddle or
paddle arm (80,000 BTU/
Hr model only).
4. Clean fan using soft cloth
moistened with kerosene or
solvent.
5. Dry fan thoroughly.
6. Replace fan on motor shaft.
Make sure setscrew is
touching back of flat
surface on motor shaft (see
Figure 10).
7. Place setscrew on flat of
shaft. Tighten setscrew
firmly (40-50 inch-
pounds).
8. Replace fan guard and
upper shell.