NATURAL GAS
CONSTRUCTION
HEATERS
OWNER’S MANUAL
150 LP SIDE PV 017
Model BNG150T
150,000 Btu/Hr
With Built-in Thermostat
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.
150,000 BTU/HR
NATURAL GAS CONSTRUCTION HEATER
SAFETY
INFORMATION
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 for use as a construction heater. Certain 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.
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.
Natural Gas: Natural gas has a distinctive
odor. This odor helps you detect a natural gas
leak. However, the odor may fade. Natural 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 National Fuel Gas Code Hand-
book, NFPA54/ANSI Z223.1 and the
Natural Gas Installation Code, CAN/
CGA B149.1. This instructs on the safe
storage and handling of flammable 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 Electrical Code, Part 1.
• Electrical grounding instructions —
This appliance is equipped with a threeprong (grounding) plug for your protection against shock hazard and should
be plugged directly into a properly
grounded three-prong receptacle or
extension cord.
• Use only with natural gas. Do not attempt to use with propane/LP gas.
• Provide adequate ventilation. 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.
• For indoor use only. Do not use heater
outdoors.
• Keep heater away from strong drafts,
wind, water spray , rain, or dripping water .
• Do not use heater in occupied dwellings or in living or sleeping quarters.
• Do not use heater in a basement or below ground level.
• 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.
• Minimum heater clearances from combustible materials:
Outlet: 8 Ft. Sides: 2 Ft.
Top: 6 Ft. Rear: 2 Ft.
• Check heater for damage before each
use. Do not use a damaged heater.
• Check hose (if used) 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.
• Locate heater on stable and level surface if heater is hot or operating.
• Never block air inlet (rear) or air outlet
(front) of heater.
• Do not leave heater unattended.
• Keep children and animals away from
heater.
• This heater is equipped with a thermostat. Heater may start at anytime.
• Never move, handle, or service a hot
or operating heater. Severe burns may
result. You must wait 15 minutes after
turning heater off.
• To prevent injury, wear gloves when
handling heater.
• Never attach duct work to heater.
• Turn off natural gas supply to heater
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.
2
103887
OWNER’S MANUAL
PRODUCT
IDENTIFICATION
Hot Air
Outlet
(Front)
Upper Shell
Lower Shell
Handle
UNPACKING
1. Remove all packing items applied to
heater for shipment. Keep plastic cover
cap (attached to inlet connector) 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.
4. Hose not included. User must supply
hose or flexible connector.
Fan Guard
Power Cord
On/Off Switch
Figure 1 - 150,000 Btu/Hr Model
Thermostat Knob
Inlet
Connector
103887
3
150,000 BTU/HR
NATURAL GAS CONSTRUCTION HEATER
THEORY OF
OPERATION
The Fuel System: The gas supply attaches to the heater by a minimum 3/4 inch
i.d. hose or flexible connector. User must
supply hose or flexible connector. The length
should be no more than 10 feet long. The
natural gas moves through the solenoid valve
and the internal regulator 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)
Nozzle
Air For Combustion
And Heating
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.
Ignitor
DSI
Fan
Motor
Internal
Regulator
On/Off Switch
Solenoid
Valve
Fuel
Cool Air
In (Back)
Power
Cord
NATURAL GAS
SUPPLY
The user must furnish the natural gas supply and the connections to the heater.
Regulate the natural gas supply down from
a minimum 5 inches water column to a
maximum of 1/2 psi. The natural gas supply
capacity should be able to supply a minimum of 150 cubic feet of gas at pressure for
each heater connected to the system.
Consult your natural gas supplier for proper
sizing of the natural gas supply lines.
Follow all local ordinances and codes. In
the absence of local ordinances and codes,
refer to the National Fuel Gas Code Hand-
book, NFPA54/ANSI Z223.1 and the Natu-
ral gas Installation Code, CAN/CGA
B149.1.
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 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.
Figure 2 - Cross Section Operational View
4
103887
OWNER’S MANUAL
INSTALLA TION
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 natural gas supply system.
2. Install plumbing to a low pressure natural gas source. The source must be regulated to a maximum1/2 psi. The plumbing must be a minimum 3/4 inch i.d.
hose or flexible connector not over 10
feet long.
3. Connect the hose to the heater at the 1/2
inch SAE flare fitting at the inlet.
4. Open natural gas supply valve slowly.
5. Check all connections for leaks.
6. Close natural gas supply valve.
Figure 3 - Hose and Inlet Connector
section, page
Inlet Connector
Hose (not
included)
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 natural gas supply valve slowly.
6. Turn on/of f switch to the ON position.
Adjust thermostat to desired setting. If
heater does not start, thermostat setting
may be too low. Turn thermostat knob
to higher position to start heater.
Note:
If heater does not start, turn on/
off switch to the OFF position. W ait ten
seconds for safety control to reset, then
try again.
Note:
If the heater still does not start
after turning thermostat knob to higher
position, the high temperature switch
may have opened during thermostat
shutdown. Allow high temperature
switch to reset. This usually takes 1015 minutes. Try starting heater again
after switch resets.
TO STOP HEATER
1. Tightly close natural gas supply v alv e.
2. Wait a few seconds. Heater will burn
gas left in supply hoses.
3. Turn on/of f switch to the OFF position.
4. Unplug heater.
section, page
STORAGE
CAUTION: Disconnect heater
from natural gas supply.
1. Place plastic cover cap over brass fitting on inlet connector.
2. Store in dry, clean, and safe place. Do
not store hose inside heater combustion
chamber.
3. When taking heater out of storage, always check inside of heater. Insects and
small animals may place foreign objects
in heater. K eep inside of heater free from
combustible and foreign objects.
MAINTENANCE
WARNING: Never service
heater while it is plugged in, connected to gas 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. Have heater inspected yearly by a qualified service agency.
4. Keep inside of heater free from combustible and foreign objects.
103887
5
150,000 BTU/HR
FAN CROSS SECTION LP-PFA/P 013
FAN LP-PFA/P 023
NATURAL GAS CONSTRUCTION HEATER
SERVICE
PROCEDURES
WARNING: Never service
heater while it is plugged in, connected to gas supply, operating,
or hot. Severe burns and electrical shock can occur.
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
IMPORTANT:
shaft before removing motor from heater.
The weight of the motor resting on the fan
could damage the fan pitch.
1. Remove upper shell (column 1).
2. Use 1/8" hex wrench to loosen setscrew
which holds fan to motor shaft.
3. Slip fan off motor shaft.
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 6).
7. Place setscrew on flat of shaft. T ighten
setscrew firmly (40-50 inch-pounds).
8. Replace fan guard and upper shell.
Remove fan from motor
IGNITOR
1. Make sure gap between ignitor electrode and burner nozzle is .13⁄.15".
Access ignitor electrode from inside
combustion chamber. No other maintenance is needed for ignitor.
Fan
Setscrew
Motor shaft
Figure 5 - Fan, Motor Shaft, and Setscrew
Location
Fan
Hub
Motor
Shaft
Setscrew
Figure 4 - Upper Shell Removal
SPECIFICATIONS
Input Rating (Btu/Hr) 150,000
Fuel Natural Gas Only For All Models
Fuel Consumption 146 Cubic Feet/Hour
Supply Pressure To Heater Min: 5"WC Max: 1/2 psi
Internal Regulator Outlet Pressure 4" WC (Factory Preset)
Manifold Pressure 5" WC
Hot Air Output (CFM Approx) 550
Motor 3,430 RPM, 1/8 HP
Electric Input 120 V/60 Hz
Amperage 2.2
Ignition Direct Spark, Interrupted Type
Ignitor Gap (Inches) .13/.15
Weight (Pounds) Heater: 24 Shipping: 35
Size - L x W x H (Inches) 36 1/4 x 14 1/2 x 20
Figure 6 - Fan Cross Section
6
103887
OWNER’S MANUAL
WIRING DIAGRAMS
Electrical Ladder Diagram
Black
Position of
Leads May
Vary
T
Line
Electrical Connection Diagram
Insulated
Connector
Green
Blue
Green
Black
Black
Blue
Ignitor
Solenoid
Valve
Automatic
Ignition
System
G V VR ACR AC
Blue
Blue
Motor
Solenoid
Valve
Automatic
Ignition
System
G V VR ACR AC
Orange
White
Green or
Green/Yellow
White
Orange
White
Neutral
Green
TECHNICAL
SERVICE
You may have further questions about this
heater. If so, contact DESA International’s
Technical Service Department at 1-800323-5190 or visit our website at
www.desatech.com.
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 can’t 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.
High
Temp
Switch
Black
On/Off
Switch
Power Cord
120 VAC
103887
Black
Thermostat
T
Black
Black
White
Blue
Blue
White
Black
Green
Black
White
Position of
Leads May
Vary
Motor
7
Green
PARTS NOT UNDER
WARRANTY
Contact authorized dealers of this product. If they can’t supply original replacement part(s), either contact your nearest
Parts Central or call DESA International’s
Parts Department for referral information
at 1-800-972-7879. When calling DESA
International, have ready:
• model number of your heater
• the replacement part number
150,000 BTU/HR
NATURAL GAS CONSTRUCTION HEATER
ILLUSTRATED
PARTS
BREAKDOWN
BNG150T
24
32
10
34
31
1
11
37
33
38
2
3
5
43
50
51
6
4
23
25
45
26
9
8
7
44
21
6
29
45
46
18
8
20
17
19
7
30
L
®
O
R
T
I
X
A
M
42
27
Note: Screws are standard hardware items
8
15
22
28
40
44
12
48
41
14
20
16
47
49
35
36
39
13
103887
OWNER’S MANUAL
PARTS LIST
This list contains replaceable parts used in your heater. When ordering parts, follow the
instructions listed under Replacement Parts on page 7 of this manual.
BNG150T
KEY PART
NO. NUMBER DESCRIPTION QTY.
1 098511-114 Upper Shell 1
2 100647-01 Screw, #10-16 x 1/2" 8
3 098512-53 Combustion Chamber Kit 1
4 103891-01 Nozzle 1
5 103934-01 Ignitor 1
6 M11084-38 Screw, #8-18 x 3/8" 2
7 099334-03 Fuel Tube Kit 1
8 097806-02 Ignitor Cable 1
9 M51108-01 Heat Shield 1
10 M51153-01 Fan 1
11 103404-01 Motor 1
12 097776-01 Universal Bushing 1
13 078978-01 Sleeve Cap 1
14 103401-01 Male Connector 1
15 103403-01 Solenoid Valve 1
16 097966-12AA Base 1
17 M51605-02 DSI Control 1
18 M12461-7 Screw, #6-32 x 1" 2
19 099432-01 Hex Nut, #6-32 2
20 M11084-27 Screw, #10-16 x 1/2" 10
21 M50104-05 Shorty Bushing 1
22 M50104-01 Shorty Bushing 1
23 101481-05 Thermal Limit Switch 1
24 097968-05 Screw, #4-40 x 1/2" 2
25 097384-04 Hex Nut, #4-40 Captive Washer 2
26 098511-129 Lower Shell 1
27 097965-02AA Side Cover 1
28 098226-01 On/Off Switch 1
29 079010-38 Wire Assembly 1
30 103406-01 Regulator 1
31 M51104-01 Handle 1
KEY PART
NO. NUMBER DESCRIPTION QTY.
32 M11084-29 Screw, #10-16 x 3/4" 2
33 097964-03AA Fan Guard 1
34 101206-01
35 M11143-1 Strain Relief Bushing 1
36 098219-17 Power Cord 1
37 M50631 Rubber Bumper 2
38 NTC-4C Lock Nut 2
39 099157-01 Break Mandrell Rivet, 3/16" 1
40 099125-01 Terminal Board 1
41 M12461-25 Screw, #10-32 x 1/4" 2
42 103407-01 Fitting, Union 1/2 NPT to 1/2 NPT 1
43 M11271-8 Clip Nut 8
44 101480-10 High Temperature Wire Assy 1
45 101480-11 High Temperature Wire Assy 1
46 098276-01 Plug 1/8 NPTF Hex 1
47 M10908-1 Screw Hex TPG “F” 6-32 x .25 2
48 097657-03 Built-in Thermostat 1
49 104905-01 Thermostat Knob 1
50 103400-02 Screw, Baffle 1
51 078896-02 Washer, Baffle 1
PARTS AVAILABLE—NOT SHOWN
079231-01 Service Center List 1
097940-09 Tradename Decal 2
103886-01 General Information Decal 1
099504-01 Warning Decal 2
103402-01 Wiring Decal 1
103021-01 Thermostat Decal 1
103889-01 NG Warning Decal 1
Motor & Relay Support Brkt Assy
1
103887
9
WARRANTY AND REPAIR SERVICE
INTERNATIONAL
KEEP THIS WARRANTY
LIMITED WARRANTY
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.
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.
Model
Serial No.
Date of Purchase
2701 Industrial Drive
P.O. Box 90004
Bowling Green, KY 42102-9004
www.desatech.com
103887 01
NOT A UPC
103887-01
Rev. C
06/99
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