Desa BLP155AT User manual

PROPANE
CONSTRUCTION
HEATER
OWNER’S MANUAL
!
GENERAL HAZARD WARNING:
FAILURETOCOMPLYWITHTHEPRECAUTIONSANDINSTRUC-
TIONSPROVIDEDWITHTHISHEATER,CANRESULTINDEATH,
SERIOUS BODILY INJURY AND PROPERTY LOSS OR DAMAGE
FROMHAZARDSOFFIRE,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
ASANINSTRUCTIONSMANUAL,LABELS,ETC.CONTACTTHE
MANUFACTURER.
Heater Size: 50,000 BTU/Hr
IMPORTANT
Readandunderstandthismanualbefore assembling, starting, or servicing heater.
Improper use of heater can cause serious injury. Keep this manual for future
reference.
®

2
100585
Safety Information......................................................................... 2
Product Identification .................................................................... 4
Unpacking......................................................................................4
Theory of Operation ......................................................................5
Propane Supply..............................................................................5
Installation .....................................................................................6
Ventilation .....................................................................................7
Operation .......................................................................................7
Storage ........................................................................................... 9
Maintenance ..................................................................................9
Troubleshooting.............................................................................10
Service Procedures ........................................................................11
Specifications................................................................................. 14
Wiring Diagram............................................................................. 14
Accessories ....................................................................................15
Technical Service .......................................................................... 15
Replacement Parts .........................................................................15
Illustrated Parts List.......................................................................16
Warranty and Repair Service.........................................................Back Cover
SECTION PAGE
CONTENTS
SAFETY
INFORMATION
Safety Information continues on next page
WARNING ICON G 001
WARNING: FIRE, BURN, INHALATION, AND EXPLOSION
HAZARD.KEEPSOLIDCOMBUSTIBLES,SUCHASBUILDING
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,ORPRODUCTSSUCHASGASOLINE,SOL-
VENTS, PAINT THINNER, DUST PARTICLES OR UNKNOWN
CHEMICALS.
WARNING ICON G 001
WARNING
NOT FOR HOME OR RECREATIONAL VEHICLE USE.
The heater is designed for use as a construction heater in accordance with ANSI
Z83.7•CGA2.14.Otherstandardsgoverntheuseoffuelgasesandheatingproducts
for specific uses. Your local authority can advise you about these. The primary
purposeofconstructionheatersistoprovide temporaryheatingofbuildingsunder
construction,alterationorrepair.Properlyused,theheaterprovidessafeeconomi-
cal heating. Products of combustion are vented into the area being heated.
Wecannot foreseeevery usewhich maybemadeofourheaters.Checkwithyour
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
monoxidethanothers.Earlysignsofcarbonmonoxidepoisoningresembletheflu,
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.
WARNING ICON G 001
WARNINGS

3
100585
2
SAFETY
INFORMATION
Continued
!
WARNINGS Continued
PropaneGas:Propanegasisodorless.Anodor-makingagentisaddedtopropane
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.
Makecertainyoureadandunderstandallwarnings.Keepthismanualforreference.
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 Na-
tional 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 square
foot opening of fresh, outside air. 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.
• 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 will 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.
• To 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.

4
100585
PRODUCT
IDENTIFICATION
Figure 1 - 50,000 BTU/Hr Model
Power
Cord
Hose /Regulator
Assembly
Inlet
Connector
Handle
Shell
Hot Air Outlet
(Front)
Fan Guard
Piezo Ignitor
Button
Automatic
Control Valve
Button
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.
Motor
Heater Base

5
100585
Air For Combustion Air For Heating
THEORY OF
OPERATION
Combustion
Chamber
Clean
Heated
Air Out
(Front)
Hose/Regulator
Assembly
Cool Air In
(Back)
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.
Motor
Fan
Figure 2 - Cross Section Operational View
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 Temperature (°F)
At Tank Location 40°32°20°10°0°-10°-20°
Number Of Tanks
(100-pound) 1111 1 22

6
100585
INSTALLATION
Inlet Connector Hose
Figure 4 - Hose and Inlet Connector
!
WARNING
Review and understand the warnings in the Safety Informa-
tion Section, pages 2 and 3. They are needed to safely
operate this heater. Follow all local codes when using this
heater.
3. Connect hose to inlet connector. Tighten firmly using a wrench.
IMPORTANT: Use extra hose or piping if needed. Install extra hose or piping
between hose/regulator assembly and propane tank. You must use the regula-
tor supplied with heater.
Propane
Tank
Propane
Supply
Valve Regulator
Hose
POL Fitting
Figure 3 - Regulator Position
1. Provide propane supply system (see Propane Supply, page 5).
2. Connect POL fitting on hose/regulator assembly to propane tank(s). Turn POL
fitting counterclockwise into threads on tank. Tighten firmly using
wrench.
IMPORTANT: Position regulator so that hose leaving the regulator is
in a horizontal position (see Figure 3). This places the regulator vent in the
proper position to protect it from the weather.
!
WARNING
Test all gas piping and connections for leaks after installa-
tion 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.

7
100585
4. Open propane supply valve on propane tank(s) slowly. Note: If not opened
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.
VENTILATION
OPERATION
Continued
!
WARNING
Review and understand the warnings in the Safety Informa-
tion section, pages 2 and 3. They are needed to safely
operate this heater. Follow all local codes when using this
heater.
!
WARNING
Provide at least a 1.5 square foot opening of fresh, outside
air while running heater. If proper fresh, outside air ventila-
tion is not provided, carbon monoxide poisoning can occur.
Provide proper fresh, outside air ventilation before running
heater.
!
WARNING
Never use an open flame to check for a leak. Apply a mix-
ture of liquid soap and water to all joints. Bubbles forming
show a leak that must be corrected. Correct all leaks at
once.
4. Plug extension cord into a 120 volt/60 hertz, 3-hole, grounded outlet. Motor
will start. Fan will turn, forcing air out front of 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 three-prong, grounded extension cord.
Extension cord must be at least six feet long. Extension cord must be UL
listed.
Extension Cord Wire Size Requirements
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.
6. Close propane supply valve.

8
100585
5. Open propane supply valve on propane tank(s) slowly. Note: If not opened
slowly, excess-flow check valve on propane tank may stop gas flow. If this
happens, close propane supply valve and open again slowly.
OPERATION
Continued
!
WARNING
Be sure motor and fan are running before pushing in auto-
matic control valve button. Flames could flash outside
heater if motor and fan are not running.
To Stop Heater
1. Tightly close propane supply valve on propane tank(s). Allow heater to burn
remaining fuel in hose.
2. Wait a few seconds. Heater will burn gas left in supply hose.
3. Unplug heater.
To Restart Heater
1. Wait five minutes after stopping heater.
2. Repeat steps under To Start Heater, page 7.
6. Push in and hold automatic control valve button (see Figure 5). Push piezo
ignitor button (see Figure 5). You may need to push piezo ignitor button 3-8
times until the burner lights. When burner lights, keep automatic control valve
button pushed in. Release button after 30 seconds.
Note: If heater fails to ignite, hose may have air in it. If so, keep automatic
control valve button pressed and wait 20 seconds. Release automatic control
valve button and wait 20 seconds for unburned fuel to exit heater. Repeat step 6.
Figure 5 - Automatic Control Valve Button and Piezo Ignitor Button
Piezo Ignitor
Button
Automatic Control
Valve Button

9
100585
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 and/or CAN/CGA
B149.2. Follow all local codes. Always store propane tanks outdoors.
2. Place plastic cover caps over brass fittings on inlet connector and hose/regula-
tor 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. Remove motor and other
internal parts if needed to remove foreign objects (see Service Procedures,
page 11).
MAINTENANCE
!
CAUTION
Disconnect heater from propane supply tank(s).
!
WARNINGS
• Never service heater while it is plugged in, connected
to propane supply, operating, or hot. Severe burns and
electrical shock can occur.
• Keep heater clear and free from combustible materials,
gasoline, and other flammable vapors and liquids.
• Do not block the flow of combustion or ventilation air.
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. Use house-
hold cleaners on difficult spots.
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. Remove
motor and other internal parts if needed to clean inside of heater (see Service
Procedures, page 11).
6. Clean fan blades each season or as needed (see Fan, page 12).

10
100585
TROUBLE-
SHOOTING
Checkvoltagetoelectricalout-
let. If voltage is good, check
heater power cord for breaks.
Adjustmotor/fanguardtokeep
fanfromhittinginsideofheater
shell. Bend fan guard if neces-
sary.
Replace fan. See Fan, page12.
Replace motor. See Motor,
page 11.
Repeat installation and opera-
tion instructions. See Installa-
tion, page 6 and Operation,
page 7.
A)Check ignitorwire. Tighten
or reattach loose ignitor wire.
SeeFigure13,page13forigni-
tor wire location.
B) Set gap between ignitor
electrode and target plate to
.17".
C) Tighten nut holding piezo
ignitor to base of heater.
D) Replace ignitor electrode.
See Ignitor, page 13.
This can happen when running
heater in temperatures above
85°F.Runheaterincoolertem-
peratures.
Check heater inlet and outlet.
Remove any obstructions.
Replace fan. See Fan, page12.
Clean heater. See Mainte-
nance, page 9.
!
WARNING
Use only in areas free of
high dust content.
No electrical power
to heater
Fan hitting inside of
heater shell
Fan blades bent
Defective motor
Userdidnotfollowinstal-
lation or operation in-
structions properly
No spark at ignitor. To
test for spark, follow step
9 under Ignitor, page 13.
If you see spark at ignitor,
have heater serviced by
qualified service person.
If no spark seen:
A) Loose or disconnected
ignitor wire
B) Wrong spark gap
C) Piezo ignitor loose
D) Bad ignitor electrode
Highsurroundingairtem-
perature causing thermal
limit device to shut down
heater.
Restricted air flow
Damaged fan
Excessive dust or debris
in surrounding area
Fan does not turn
when heater is
plugged in.
Heater will not
ignite.
Heater shuts down
while running.
OBSERVED FAULT POSSIBLE CAUSE REMEDY
!
WARNING
Never service heater while it is plugged in, connected to
propane supply, operating, or hot. Severe burns and
electrical shock can occur.