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.
Page 2
375,000 BTU/HR - A SERIES
PROPANE CONSTRUCTION HEATER
SAFETY
INFORMA TION
WARNINGS
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 and approved for use
as a construction heater under ANSI Z83.7.
The 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! 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 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.
•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 Propane Installation Code, CAN/CGA B149.2. This in-
structs 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 the
Canadian Electric 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 or extension cord.
•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.
•For indoor use only. Provide adequate
ventilation.
•Keep heater away from strong drafts,
wind, water spray, rain, or dripping water .
•Use only in well-vented areas. Before
using heater, provide at least a threesquare-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 California 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. Dust is combustible. Do not use
heater in areas with high dust content.
•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 in a basement or 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 hose and factory regulator provided with the heater.
•Check hose before each use of heater .
If highly worn or cut, replace with
hose specified by manufacturer before
using heater.
•Do not alter heater. Keep heater in its
original state.
•Do not use heater if altered.
•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.
•Never block air inlet (rear) or air outlet
(front) of heater.
•Never move, handle, or service a hot,
operating, or plugged-in heater.
•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.
•Do not adjust regulator below 7 psig
or above 20 psig.
2
100416
Page 3
OWNER’S MANUAL
PRODUCT
IDENTIFICATION
Hot Air Outlet
(Front)
Outer Shell
On/Off Switch
Handle
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.
Fan
Guard
Inlet Connector
BLP& VLP375LP-PFA/PV 008C
Figure 1 - 375,000 Btu/Hr Models
Power Cord
Hose /Regulator
Assembly
100416
3
Page 4
375,000 BTU/HR - A SERIES
PROPANE CONSTRUCTION HEATER
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.
Combustion
Chamber
Clean
Heated
Air Out
(Front)
DSI
Air For Combustion Air For Heating
Figure 2 - Cross Section Operational View
The Ignition System: The direct spark
ignitor (DSI) sends voltage to the ignitor.
The ignitor ignites the fuel and air mixture.
The Safety Control System: This system causes the heater to shut down if the
flame goes out. The motor will continue to
run, but no heat is produced.
Ignitor
Nozzle
Fan
Solenoid
Valve
Motor
Hose/Regulator
Assembly
Cool Air
In (Back)
Power
Cord
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 the Propane Installation Code CAN/
CGA B149.2. Your local library or fire de-
partment will have these booklets.
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 100pound tanks needed to run this heater.
Do not operate this product with any tank
smaller than 100 pounds.
Temperature (°F) At Tank
40° 32° 20° 0° -10° -20°
Number3(Use larger tank below
of tanks40°F)
Less gas is vaporized at lower temperatures.
You may need a 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.
VENTILATION
WARNING: Follow the minimum fresh, outside air ventilation requirements. If proper fresh,
outside air ventilation is not provided, carbon monoxide poisoning can occur. Provide proper
fresh, outside air ventilation before running heater.
Provide at least three square feet of fresh,
outside air for each 100,000 Btu/Hr of rating. This heater requires a fresh air opening
of at least 11.25 square feet. Provide extra
fresh air if more heaters are being used.
4
100416
Page 5
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 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.
1.Provide propane supply system (see
Propane Supply, page 4).
2.Connect POL fitting on hose/regulator
assembly to propane tank(s). Turn POL
fitting counterclockwise into threads on
tank. Tighten firmly using a wrench.
IMPORTANT:
black adjustment knob pointing down.
Pointing adjustment knob down protects regulator from weather damage.
3. Connect hose to inlet connector.
Tighten firmly using a wrench.
IMPORTANT:
may be used if needed. Install extra
hose or piping between hose/regulator
assembly and propane tank. You must
use the regulator supplied with the
heater.
Supply
Valve
Propane
Tank
Figure 3 - Regulator With Adjustment
Knob Pointing Down
POL Fitting
section, page
Tighten regulator with
Extra hose or piping
Hose
Regulator
Adjustment
Knob
(pointing
down)
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, you may hear a click inside the
regulator assembly. T o reset the excess
flow check valve, close propane supply valve and open again slowly.
5.Adjust regulator between 7 and 20 psig
(see Figure 5).
Note:
Higher regulator
setting will allow heater to produce
more heat.
WARNING: Do not adjust regulator below 7 psig or above 20 psig.
Heater may not run properly.
6.Check all connections for leaks.
7.Close propane supply valve.
Hose
Inlet Connector
Figure 4 - Hose and Inlet Connector
I
N
C
R
E
A
S
E
5
10
15
20
Regulator
Figure 5 - Adjustable Regulator Set At
7 psig
5
5
10
10
15
15
20
20
OPERATION
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.
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 threeprong, grounded extension cord. Extension cord must be at least six feet long.
Extension cord must be UL listed.
Extension Cord Size Requirement
Up to 50 feet long, use 18 A WG 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.
slowly , excess-flow check valve on propane tank will stop gas flow. If this happens, you may hear a click inside the
regulator assembly. T o reset the excess
flow check valve, close propane supply valve and open again slowly.
6.Make sure regulator is set between 7
and 20 psig.
setting will allow heater to produce
more heat.
WARNING: Do not adjust regulator below 7 psig or above 20 psig.
Heater may not run properly.
7.Turn on/off switch to the ON position.
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.
section, page
Note:
If not opened
Note:
Higher regulator
100416
Continued
5
Page 6
375,000 BTU/HR - A SERIES
PROPANE CONSTRUCTION HEATER
OPERATION
Continued
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.
TO RESTART HEATER
If safety control stops gas flow to heater,
motor will continue to run.
To restart heater:
1.Turn on/off switch to the OFF position.
2. Wait ten seconds, then turn on/off
switch to the ON position.
If heater does not restart
• Check manual valves (if any) and sup-
ply valves (on propane tank). Make sure
they are open.
• Check fuel level in propane tank(s). If
fuel level is too low, contact local propane gas company.
If heater still does not restart, contact your
local service center.
STORAGEMAINTENANCE
CAUTION: Disconnect heater
from propane supply tank(s).
1.Store propane tank(s) in safe manner.
See Chapter 5 of Standard for Storage
and Handling of Liquefied Petroleum
Gases, ANSI/NFP A 58 and the Propane
Installation Code CAN/CGA B149.2.
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.
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.
6
100416
Page 7
OWNER’S MANUAL
SERVICE
PROCEDURE
WARNING: Never service
heater while it is plugged in, connected to propane supply, operating, or hot. Severe burns and
electrical shock can occur.
CLEANING FAN
Clean fan every 500 hours of operation or as
needed.
1.Remove screws on side cover using
5/16" nut-driver.
2.Remove side cover.
3.Detach the five motor wires from parts
under heater shell. Be sure to detach
only wires coming from motor.
The five motor wires are:
• white wire—to terminal board
• black wire—to terminal board
• blue wire—to thermal switch wire
• orange wire—to solenoid valve
• green wire—to grounding screw on shell
4.Remove fan guard from rear of heater.
Thermal
Switch Wire
Grounding Screw
Terminal
Board
5.Reach into rear of heater shell. Carefully pull motor wires through hole in
bottom of shell.
Note:
Pull wires
through hole one at a time.
6.Remove nuts and mounting bolts holding motor mount to shell. Use 3/8" nutdriver and 7/16" wrench.
7.Carefully pull motor and fan out of
shell.
IMPORTANT:
Be careful not to
damage fan. Do not set motor and fan
down with the weight resting on fan.
This could damage fan pitch.
8.Turn motor and fan around. Place motor
and fan into shell backwards.
Note:
Mo-
tor will go into shell first (see Figure 8).
9.Line up rear mounting holes in shell
with first hole on each side of motor
mount (see Figure 8).
Note:
When
holes are lined up, fan should be outside of shell.
10. Holding mounting bolt, carefully reach
through fan blades into rear of heater.
Be careful not to damage fan pitch. Insert bolt through motor mount and shell.
With free hand, attach nut finger tight.
Repeat process for other mounting hole.
11. Use 1/8" hex wrench to loosen setscrew
which holds fan to motor shaft (see Figure 9).
Rear
Mounting
Hole
First
Hole
12. Slip fan off motor shaft.
13. Clean fan using soft cloth moistened
with kerosene or solvent.
14. Dry fan thoroughly.
15. Replace fan on motor shaft. Make sure
setscrew is touching back of flat surface on motor shaft (see Figure 10).
16. Place setscrew on flat of shaft. Tighten
setscrew firmly (40-50 inch-pounds).
17. Remove two nuts and bolts securing
motor mount to shell.
18. Pull motor and fan from shell. Turn
motor and fan around. Carefully place
back in shell.
Note:
Fan will go into
shell first.
19. Line up mounting holes in shell with
holes on motor mount. Replace four
bolts through shell and motor mount.
Insert bolts from outside of heater.
Tighten nuts firmly.
20. Route motor wires through hole in bottom of shell (see Figure 7).
21. Connect motor wires as follows (see
Figure 6):
• white wire—to terminal board.
Note:
Attach to empty connector on
white wire side of terminal board.
• black wire—to terminal board.
Note:
Attach to empty connector on
black wire side of terminal board.
• blue wire—to thermal switch wire
• orange wire—to solenoid valve
• green wire—to grounding screw on shell
22. Replace side cover.
23. Replace fan guard.
Solenoid Valve
Figure 6 - Location of Motor Wires
Mounting
Bolts
Motor
Wires
Figure 7 - Location of Fan and Motor
100416
Motor
Mount
26
Figure 8 - Fan and Motor Turned Around
Fan
Setscrew
Motor shaft
Figure 9 - Fan, Motor Shaft, and Setscrew
Location
FANLP-PFA/P 023A
7
Fan
Hub
NLP-P
Figure 10 - Fan Cross Section
Motor
Shaft
Setscrew
Page 8
375,000 BTU/HR - A SERIES
PROPANE CONSTRUCTION HEATER
WIRING DIAGRAMS
Ignitor
Orange
DSI
Control
Blue
White
Black
Blue
Connector
Green
Figure 11 - Wiring Diagram
Black
Black
Solenoid
Valve
Orange
Blue
Green
Orange
T
Thermal
Switch
Ignitor
Solenoid
Direct Spark
Blue
Blue
Green
Blue
Connector
Valve
Ignitor
Thermal Switch
Blue
Motor
WhiteWhite
Black Black
Terminal
Board
Orange
Blue
White
Green
Black
Power
Cord
On/Off
Switch
White
Black
Green
LineGroundNeutral
Figure 12 - Electrical Ladder Diagram
Centrifugal
Switch
Motor
Green
White
8
100416
Page 9
OWNER’S MANUAL
SPECIFICATIONS
Output Rating (Btu/Hr)225,000 to 375,000
FuelPropane Vapor Only
Fuel Consumption
Gallons/Hour2.5 Minimum/4.0 Maximum
Pounds/Hour10.4 Minimum/17.4 Maximum
Supply Pressure To Regulator
Minimum (for purposes of
input adjustment)25 psig
MaximumTank Pressure
Regulator Outlet Pressure7-20 psig
Hot Air Output (CFM)1500
Motor1725 RPM, 1/5 HP
Electric Input120 V/60 Hz
Amperage4.2
IgnitionDirect Spark
Weight (Pounds)
Heater42
Shipping49
Size - L x W x H (Inches)34 x 13 x 19.5
ACCESSORIES
Purchase accessories and parts from your
nearest dealer or service center. If your
dealer or service center can not supply an
accessory or part, either contact your nearest Parts Central (listed in the separate Authorized Service Center booklet) or call
DESA International’s Parts Department at
1-800-972-7879 for referral information.
You can also write to the address listed on
the back page of this manual.
TECHNICAL
SERVICE
You may have further questions about
this heater. If so, contact DESA
International’s Technical Service Department at 1-800-323-5190.
You can also visit DESA International’s
Technical Service web site at
www.desatech.com.
SERVICE
Hose: LPA1020
PUBLICATIONS
A 10 foot hose for locating heater further
away from propane tank(s).
Regulator: LPA2020
Hose and Regulator Assembly:
LPA3030
Fuel Gas Connector: LPA4020
A POL adapter with excess-flow check valve.
Thermostat: HA1210
You can receive an Illustrated Parts List free
of charge. Send your request and a selfaddressed, stamped envelope to DESA International (address on back page). Be sure
to include the heater model number. You
can purchase a service manual for $5. Make
check payable to DESA International.
REPLACEMENT
PARTS
WARNING: 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. This will also protect
your warranty coverage for parts
replaced under warranty.
PARTS UNDER WARRANTY
Contact authorized dealers of this product. If they cannot supply original replacement part(s), either contact your nearest Parts Central or call DESA
International’s Technical Service Department at 1-800-323-5190. When calling
DESA International, have ready:
• your name
• your address
• model and serial numbers of your heater
• how heater was malfunctioning
• purchase date
In most cases, we will ask you to return the
defective part to the factory.
PARTS NOT UNDER
WARRANTY
Contact authorized dealers of this product.
If they cannot supply original replacement
part(s), either contact your nearest Parts
Central or call DESA International’s Parts
Department at 1-800-972-7879 for referral
information. When calling DESA International, have ready:
• model number of your heater
• the replacement part number
100416
9
Page 10
375,000 BTU/HR - A SERIES
PROPANE CONSTRUCTION HEATER
ILLUSTRATED
PARTS
BREAKDOWN
BLP375A
RLP375A
2
21
6
1
5
27
4
8
24
23
16
19
15
20
Note: Screws are standard hardware items
25
14
9
18
3
10
28
17
26
12
13
7
11
22
10
100416
Page 11
OWNER’S MANUAL
PARTS LIST
BLP375A
RLP375A
This list contains replaceable parts used in your heater. When ordering parts, follow the instructions
listed under Replacement Parts on page 9 of this manual.
DESA International warrants this product and any parts thereof, to be free from defects in materials and workmanship for one (1) year from
the date of first purchase when operated and maintained in accordance with instructions. This warranty is extended only to the original retail
purchaser, when proof of purchase is provided.
This warranty covers only the cost of parts and labor required to restore the product to proper operating condition. Transportation and
incidental costs associated with warranty repairs are not reimbursable under this warranty.
Warranty service is available only through authorized dealers and service centers.
This warranty does not cover defects resulting from misuse, abuse, negligence, accidents, lack of proper maintenance, normal wear,
alteration, modification, tampering, contaminated fuels, repair using improper parts, or repair by anyone other than an authorized dealer
or service center. Routine maintenance is the responsibility of the owner.
This Express Warranty Is Given In Lieu Of Any Other Warranty Either Expressed Or Implied, Including Warranties Of Merchantability
And Fitness For A Particular Purpose.
DESA International assumes no responsibility for indirect, incidental or consequential damages. Some states do not allow the exclusion
or limitation of incidental or consequential damages, or limitations or exclusions may not apply to you. This Limited Warranty gives you
specific legal rights and you may also have other rights which vary from state to state.
We reserve the right to amend these specifications at any time without notice. The only warranty applicable is our standard written warranty. We
make no other warranty, expressed or implied.
WARRANTY SERVICE
Should your heater require service, return it to your nearest authorized service center. Proof of purchase must be presented with the heater. The
heater will be inspected. A defect may be caused by faulty materials or workmanship. If so, DESA International will repair or replace the heater
without charge.
REPAIR SERVICE
Return your heater to your nearest authorized service center. Repairs not covered by the warranty will be billed at standard prices. Each Service
Center is independently owned and operated. We reserve the right to amend these specifications at any time without notice.
Model
Serial No.
Date of Purchase
INTERNATIONAL
2701 Industrial Drive
P.O. Box 90004
Bowling Green, KY 42102-9004
www.desatech.com
For information, write: DESA International, P.O. Box 90004
Bowling Green, Kentucky 42102-9004 ATTN: Customer Service Department
When writing, always include model number and serial number.
100416 01
NOT A UPC
100416-01
Rev. H
03/00
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