L.B. White 346JX Manual

Propane Vapor
Withdrawal
Congratulations!
You have purchased the finest heater available.
Your new L.B. White heater incorporates the benefits from the most experienced
manufacturer of heating products using state-of-the-art technology.
We, at L.B. White, thank you for your confidence in our products and
welcome any suggestions or comments you may have...call us, toll-free,
at 1-800-345-7200.
Owner's Manual and Instructions
Construction Heaters
Certification by:
150-23363
MODELS OUTPUT (Btuh) FUEL
346JX 60,000
L.B.WHWHITEITE
W6636 L. B. White Rd., Onalaska, WI 54650 ■[phone] ■[phone] ■Fax [phone]
®
ATTENTION ALL USERS
This heater has been tested and evaluated by C.S.A. International in accordance
with Standard ANSI Z83.7zCSA 2.14 and is listed and approved as a direct gas-fired
circulating construction heater with intended use for primarily the temporary heating
of buildings under construction, alteration, or repair. As an alternative use, this
heater has also been tested and evaluated by the L.B. White Co., Inc. for the heating
of agricultural animal confinement buildings and has been used in such
applications for many years. If you are considering using this product for any
applications other than those previously stated, then please contact your fuel gas
supplier or the L.B. White Co., Inc.

WARNING
Fire and Explosion Hazard
■Not for home or recreational vehicle use.
■Installation of this heater in a home or
recreational vehicle may result in a fire or
explosion.
■Fire or explosions can cause property
damage or loss of life.
FOR YOUR SAFETY
If you smell gas:
1. Open windows.
2. Don't touch electrical switches.
3. Extinguish any open flame.
4. Immediately call your gas supplier.
FOR YOUR SAFETY
Do not store or use gasoline or other
flammable vapors and liquids in the vicinity
of this or any other appliance.
WARNING
Fire and Explosion Hazard
■Keep solid combustibles a safe distance
away from the heater.
■Solid combustibles include wood or paper
products, feathers, straw, and dust.
■Do not use the heater in spaces which
contain or may contain volatile or airborne
combustibles.
■Volatile or airborne combustibles include
gasoline, solvents, paint thinner, dust
particles or unknown chemicals.
■Failure to follow these instructions may
result in a fire or explosion.
■Fire or explosions can lead to property
damage, personal injury or loss of life.
GENERAL HAZARD WARNING
■Failure to comply with the precautions and instructions provided with this heater, can result
in:
— Death
— Serious bodily injury or burns
— Property damage or loss from fire or explosion
— Asphyxiation due to lack of adequate air supply or carbon monoxide poisoning
— Electrical shock
■Read this Owner’s Manual before installing or using this product.
■Only properly-trained service people should repair or install this heater.
■Save this Owner’s Manual for future use and reference.
■Owner’s Manuals and replacement labels are available at no charge. For assistance, contact
L.B. White at 800-345-7200.
WARNING
■Proper gas supply pressure must be provided to the inlet of the heater.
■Refer to rating plate for proper gas supply pressure.
■Gas pressure in excess of the maximum inlet pressure specified at the heater inlet can cause
fires or explosions.
■Fires or explosions can lead to serious injury, death, building damage or loss of livestock.
■Gas pressure below the minimum inlet pressure specified at the heater inlet may cause
improper combustion.
■Improper combustion can lead to asphyxiation or carbon monoxide poisoning and therefore
serious injury or death to humans and livestock.
2

Table of Contents
3
This manual will instruct you in the service and care of your
unit. Have your qualified installer review this manual with
you so that you fully understand the heater and how it
functions.
The parts list within this Owner's Manual is designed for
ease of parts selection. Wherever possible, the parts list
allows parts selection without use of the model number.
Parts may be selected by referring to applicable
illustrations.
Contact your local L. B. White distributor or the L. B. White
Co., Inc. for assistance, or if you have any questions about
the use of the equipment or its application.
The L. B. White Co., Inc. has a policy of continuous product
improvement. It reserves the right to change specifications
and design without notice.
SECTION PAGE
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Heater Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Installation Instructions
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Pipe Sizing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Air Diverter Installation Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Hanging Installation Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Sediment Trap Assembly Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Manual Shut-Off Valve,
Hose & Regulator Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Start-Up Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Shut-Down Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Cleaning Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Maintenance Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Service Instructions
Motor and Fan Wheel Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Pilot Light Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Thermocouple . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Testing Manual Reset High Limit Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Pressure Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Electrical Connection and Ladder Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Heater Component Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Parts Identification
Parts Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Warranty Policy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Replacement Parts and Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
General Information

SPECIFICATIONS
Maximum Input (BTUH) 60,000 Btuh
250 CFM
11 1/2 in. W.C.
11 in. W.C.
\
2.78 lbs. per hour
1/15 H.P. 1.0 AMP
230/60/1 1750 RPM
3.0
1.0
21 1/4 x 11 1/4 x 24
TOP 6 in.
SIDES 6 in.
BACK 6 in.
BLOWER
OUTLET
PROPANE GAS
SUPPLY
Minimum Ambient Temperature
In Which Heater May be Operated
346JX
Propane Gas
MMooddeell
Ventilation Air Required
to Support Combustion
Burner Manifold Pressure
Electrical Supply
(Volts/Hz/Phase)
Amp Draw
(Starting Amps
Includes Igniter)
Dimensions (Inches)
L x W x H
Minimum Safe
Distances From
Nearest
Combustible
Materials
STARTING
CONTINUOUS
OPERATION
Motor Characteristics
Fuel Consumption Per Hour
Inlet Gas Supply
Pressure Acceptable
at the Inlet of the
Heater for Purpose
of Input Adjustment
MAX.
MIN.
MAX.
11 1/2 in. W.C.
Ball Bearing
4 ft.
220/60/1
4
Heater Specifications
6 ft. (1.83 m)
- 20ºF

■Some ppeople ccannot ssmell wwell. SSome ppeople ccannot
smell tthe oodor ooftthe mman-mmade cchemical aadded tto
propane oornnatural ggas. YYou mmust ddetermine iifyyou ccan
smell tthe oodorant iintthese ffuel ggases.
■Learn to recognize the odor of propane gas and natural
gas. Local propane gas dealers and your local natural
gas supplier (utility) will be more than happy to give you
a “scratch and sniff” pamphlet. Use it to become
familiar with the fuel gas odor.
■Smoking can decrease your ability to smell. Being
around an odor for a period of time can affect your
sensitivity to that particular odor. Odors present in
animal confinement buildings can mask fuel gas odor.
■The oodorant iinppropane ggas aand nnatural ggas iisccolorless
and tthe iintensity oofiits oodor ccan ffade uunder ssome
circumstances.
■If there is an underground leak, the movement of gas
through the soil can filter the odorant.
■Propane gas odor may differ in intensity at different
levels. Since propane gas is heavier than air, there may
be more odor at lower levels.
■Always bbessensitive ttotthe sslightest ggas oodor. If you
continue to detect any gas odor, no matter how small,
treat it as a serious leak. Immediately go into action as
discussed previously.
ATTENTION -- CRITICAL POINTS TO REMEMBER!
■Propane gas and natural gas have a distinctive odor.
Learn to recognize these odors. (Reference “Fuel Gas
Odor” and “Odor Fading” sections above.
■ If you have not been properly trained in repair and service
of propane gas and natural gas fueled heaters, then do
not attempt to light heater, perform service or repairs, or
make any adjustments to the heater on propane gas or
natural gas fuel system.
■Even if you are not properly trained in the service and
repair of the heater, ALWAYS be consciously aware of the
odors of propane gas and natural gas.
■A periodic “sniff test” around the heater or at the
heater’s joints; i.e. hose, connections, etc., is a good
safety practice under any conditions. If you smell even a
small amount of gas, CONTACT YOUR FUEL GAS
SUPPLIER IMMEDIATELY. DO NOT WAIT!
Propane ggas aand nnatural ggas hhave mman-mmade oodorants aadded sspecifically ffor ddetection oofffuel ggas lleaks.
If aaggas lleak ooccurs, yyou sshould bbeaable ttossmell tthe ffuel ggas.
THAT’S YYOUR SSIGNAL TTOGGOIINTO IIMMEDIATE AACTION!
■Do not take any action that could ignite the fuel gas. Do
not operate any electrical switches. Do not pull any
power supply or extension cords. Do not light matches
or any other source of flame. Do not use your telephone.
■Get everyone out of the building and away from the area
immediately.
■Close all propane gas tank or cylinder fuel supply valves,
or the main fuel supply valve located at the meter if you
use natural gas.
■Propane gas is heavier than air and may settle in low
areas. When you have reason to suspect a propane
leak, keep out of all low areas.
■Natural gas is lighter than air and can collect around
rafters or ceilings.
■Use your neighbor’s phone and call your fuel gas
supplier and your fire department. Do not re-enter the
building or area.
■Stay out of the building and away from the area until
declared safe by the firefighters and your fuel gas
supplier.
■FINALLY, let the fuel gas service person and the
firefighters check for escaped gas. Have them air out
the building and area before you return. Properly trained
service people must repair the leak, check for further
leakages, and then relight the appliance for you.
WARNING
■Do not use this heater for heating human living quarters.
■Do not use in unventilated areas.
■The flow of combustion and ventilation air must not be
obstructed.
■Proper ventilation air must be provided to support the
combustion air requirements of the heater being used.
■Refer to the specification section of the heater’s Owner’s
Manual, heater dataplate, or contact the L.B. White
Company to determine combustion air ventilation
requirements of the heater.
■Lack of proper ventilation air will lead to improper
combustion.
■Improper combustion can lead to carbon monoxide
poisoning in humans leading to serious injury or death.
Symptoms of carbon monoxide poisoning can include
headaches, dizziness and difficulty in breathing.
■Symptoms of improper combustion affecting livestock
can be disease, lower feed conversion, or death.
Asphyxiation HHazard
5
Safety Precautions
FUEL GAS ODOR
ODOR FADING -- NO ODOR DETECTED

1. These safety precautions have been developed as
generally applicable to all propane and natural gas-
fired heaters manufactured by the L. B. White
Company. They are designed to be consistent with
other printed specifications and instructions provided
to you with your heater.
2. National, state and/or local codes may impose
standards applicable to installation and gas
servicing subjects covered in these SAFETY
PRECAUTIONS.
3. The gas supply line installation, the repair and the
service of this heater requires continuing expert
training and knowledge of gas heaters and should
not be attempted by anyone who is not so
qualified:
QUALIFICATIONS FFOR
SERVICING AAND IINSTALLATION:
a. To be a qualified gas heater service person, you
must have been trained in gas-fired appliance
servicing, repair and also have sufficient
experience to allow you to troubleshoot, replace
defective parts, and test heaters in order to get
them into a continuing safe and normal
operation condition. You must completely
familiarize yourself with each model heater by
reading and complying with the safety
instructions, labels, owner’s manual, etc. that is
provided with each heater.
b. To be a qualified gas installation person, you
must have sufficient training and experience to
handle all aspects of installing, repairing and
altering gas lines, including selecting and
installing the proper equipment, and selecting
proper pipe size to be used. This must be done
in accordance with all local, state and national
codes as well as the manufacturer’s
requirements.
4. All installations or applications of L. B. White Co.,
Inc.’s equipment should meet the requirements of
local, state and national propane gas and natural
gas, electrical and safety codes. Your gas supplier,
local licensed electrician, local fire department, and
government agencies can help you determine these
requirements. In absence of local codes, comply
with the Standard for Storage and Handling of
Liquefied Petroleum Gas, ANSI/NFPA 58-Latest
Edition, ANSI Z223.1/NFPA 54 National Fuel Gas
Code, and ANSI/NFPA 70 National Electrical Code. If
you are still in doubt, contact the L. B. White Co., Inc.
5. We cannot anticipate every use which may be made
of our heaters. Check with our local fire safety
authority if you have questions about applications.
6. Do not operate the heater with panels removed.
7. Forced air heaters shall not be directed toward any
propane gas supply container within 20 ft. (6.10 m)
8. The minimum of propane gas supply cylinder size
should be a 100 pound propane gas supply cylinder.
When using a cylinder supply system, it should be
arranged to provide vapor withdrawal from the
operating cylinder.
9. The heater shall be installed so that it is not directly
exposed to water spray, rain, or dripping water.
10. If at any time you notice something unusual about
the operation of your heater such as gas odor,
overheating, flames other than in the burner area,
etc., evacuate the area immediately and call your
fire department and your gas service agency.
Get assurances from the fire department that the
area is free of gas before you attempt to relight
heater.
11.
GAS LLEAKS: Any leak of gas from the appliance or
gas line creates an extremely hazardous situation.
Even small quantities of leaked gas can explode with
disastrous consequences. Accordingly, any leak of
fuel, no matter how small, poses the risk of severe
injury or death in the event of an explosion, as well as
the risk that users might be smothered by the
presence of fuel fumes. The odor of leaking gas may
be masked by other smells in the vicinity of the
appliance. Propane fuel is heavier than air and is
most readily sniffed by placing your nose close to
the level of the floor. If you don’t smell the odor of
the gas, but nonetheless suspect that propane has
leaked, you should immediately vacate the premises
and call the gas company or your local fire depart-
ment. Do not allow any sparks or flames to come
into an area where it is suspected that gas has
leaked.
12. Intended use is the heating of agricultural buildings.
This heater is designed for indoor installation only.
Adequate vventilation mmust bbepprovided, oother-wwise
sooting ooriimproper ccombustion mmay ooccur.
13. The flow of combustion and ventilation air must not
be obstructed.
14. Do not move, handle, or service heater while
in operation or connected to a power or fuel
supply.
15. DO NOT wash down interior or exterior of heater. Use
a soft brush or dry cloth only to clean interior or
exterior of heater.
16. For safety, this heater is equipped with a manual
reset high-limit switch. The high limit switch may be
6

bypassed for testing and troubleshooting purposes
only. Never ooperate tthe aappliance wwith aany ssafety
device bbypassed.
17. Position heater properly before use—heater must set
level and according to minimum clearances. (See
Specifications.)
18. Keep all propane fuel gas containers at least
6 ft. (1.83 m) from heater. DO NOT locate fuel gas
containers or fuel supply hoses anywhere near the
blower outlet of the heater.
19. The hose assembly of the heater shall be visually
inspected periodically to insure a good, safe
condition. If it is evident there is excessive abrasion
or wear, or if the hose is cut, it must be replaced
prior to heater being put into operation. The hose
assembly shall be protected from traffic, building
materials, and contact with hot surfaces during use.
20. Check for gas leaks and proper function upon
installation, periodically and when relocating.
21. Installation must comply with applicable codes.
Use pipe joint compound that is resistant to liquefied
petroleum gas and natural gas.
22. Never light the heater or smoke in areas where there
is gas odor. Allow sufficient fresh air to replace that
used by combustion.
23. Use only the pre-set regulator as recommended by
the L. B. White Company.
24. Open the valve on gas supply vessel slowly. This will
prevent lock-up of excess flow valve. If this happens,
close gas supply valve, wait several minutes—it will
reset itself.
25. The heater should be inspected before each use and
at least annually by a qualified service person for
proper operation.
26. Always turn off the gas supply when the heater is not
in use.
27. When the heater is to be stored indoors, the
connection between the propane cylinder(s) and the
heater must be disconnected and the cylinder(s)
removed and stored in accordance with the Standard
for the Storage and Handling of Liquified Petroleum
Gases-ANSI/NFPA 58.
28. Propane gas cylinders and ASME vessels have left-
hand threads. Always use a wrench to make the
connection and removal of the
P.O.L. fitting. Do not
use pliers. Check for gas leaks.
29. This heater is equipped with a ground wire within the
power cord for your protection against shock hazard
and must be connected into a properly grounded
electrical supply.
30. If the gas flow is interrupted and the heater flame is
extinguished, shut off gas and wait a minimum of five
(5) minutes or until gas clears away before relighting.
31. Installations not using the gas hose supplied with
this appliance must connect dimensionally using
American National Standard Wrought Steel and
Wrought Iron Pipe B36/10-1970. (Aluminum piping
or tubing shall not be used.) Copper tubing when
used for conveying natural gas, shall be internally
tinned or equivalently treated to resist sulphur.
WARNING
The appliance area shall be kept clear and free
from combustible materials, gasoline, and other
flammable vapors and liquids. Otherwise, a fire
or explosion may result.
WARNING
Do not attempt to field fabricate hose assemblies using
clamps, barbed fittings, or any other components. These
can loosen over a period of time, leading to gas leaks and
consequently fire or explosions. Use only the hose
assembly supplied by the L. B. White Co., Inc. for the
appliance being installed.
WARNING
Never use a rigid connection, hard pipe or copper
tubing, to an appliance inlet when the appliance is
using chain, cable, or other material allowing appliance
movement. If the appliance is moved or jarred, hard
piping or tubing can crack, causing gas leaks leading to
fire, explosion, serious injury or death. Always use an
approved propane gas hose to convey gas to the
appliance in a hanging type of installation.
WARNING
Do not block the air inlets of the appliance. Doing so,
when in operation, will lead to:
A. Improper combustion, leading to carbon monoxide
poisoning and asphyxiation.
B. Burner flame damage to wires, electrical controls and
components, and gas controls.
Either situation can lead to serious injury or death,
property damage or animal loss.
7

1. Read all safety precautions and follow L. B. White
recommendations when installing this heater. If
during the installation or relocating of heater, you
suspect that a part is damaged or defective, call a
qualified service agency for repair or replacement.
2. Position the heater and its gas supply hose so as to
protect heater and its gas supply hose from livestock.
3. Insure that all accessories that ship within the heater
have been removed from inside of heater and
installed. This pertains to air diverters, hose,
regulators, etc.
4. Make sure heater hangs level (check crosswise and
lengthwise).
5. This heater is approved for indoor use only.
6. The heater is not for use with ductwork.
7. The unit's gas regulator (with pressure relief
valve) should be installed outside of building.
Any regulators inside the buildings must be
properly vented to the outside. Local, state and
national codes always apply to regulator installation.
Natural gas regulators with vent limiting device
may be mounted indoors without venting to out-
doors.
8. It is required in accordance with NFPA 54, Latest
Edition, that a sediment trap be installed at the gas
valve inlet to prevent foreign materials (pipe com-
pound, pipe chips, and scale) from entering gas
valve.
9. It is required in accordance with NFPA 54, Latest
Edition, that gas utilization equipment connected to a
piping system have an accessible, approved manual
shut off valve installed within 6 ft. (1.83M) of the
appliance it serves.
10. Always use pipe joint compound that is resistant to
propane gas and natural gas.
11. Check all connections for gas leaks using leak
detection solution or ammonia free soapy water
solution. The gas leak test is performed as follows:
Paint pipe connections, hose connections, fittings,
and adapters upstream of gas control with rich
ammonia free soapy water solution or leak detection
liquid to test for leaks before operating main burner.
Bubbles indicate a gas leak. To stop leak, tighten
suspect pipe connections. After all connections are
checked, turn on main burner. Stand clear while
main burner ignites to prevent injury caused from
hidden leaks which could cause flashback. With
main burner in operation, paint pipe connections,
hose, etc., joints, and gas control valve inlet and
outlet with ammonia free soapy water solution or
leak detection liquid. Bubbles indicate gas leak. To
stop leak, tighten suspect connection. Replace part
if leak can’t be stopped.
12. A qualified service person must check for proper
operating gas pressure upon installation of the
heating appliance.
13. Light according to instructions on heater.
14. If gas flow is interrupted and heater flame becomes
extinguished, shut off gas and wait a minimum of five
(5) minutes or until gas clears away before relighting.
15. Do not use in unventilated areas. Adequate
ventilation is essential to safe operation. The flow of
ventilation air must not be obstructed. For more
specific requirements, ask your gas supplier about
NFPA #54 of the National Fuel Gas Code.
16. Do not place in area where heavier than air L.P. gas
can accumulate.
17. Make sure the physical installation of the heater
meets codes and instructions supplied with the
heater. Do not connect the heater to the gas supply
if it does not meet those requirements or until it
does.
WARNING
Fire ooreexplosion hhazard.
Can ccause pproperty ddamage, ssevere iinjury oorddeath.
1. Disconnect power supply before wiring to prevent
electrical shock or equipment damage.
2. To avoid dangerous accumulation of fuel gas, turn
off gas supply at the appliance service valve before
starting installation, and perform gas leak test after
completion of installation.
3. Always install a sediment trap in gas supply to
prevent contamination of gas control.
8
Installation Instructions
GENERAL
WARNING
Fire aand EExplosion HHazard
■Do not use open flame (matches, torches, candles,
etc.) in checking for gas leaks.
■Use only approved leak detectors.
■Failure to follow this warning can lead to fires or
explosions.
■Fires or explosions can lead to property damage,
personal injury or loss of life.

18. It is extremely important to use the proper size and
type of gas supply line to assure proper functioning of
the heater. Consult your propane gas supply service
agency for proper line sizing and installation. (See
“Pipe Sizing” example on page 10.)
19. This heater may or may not be supplied with a
regulator. Whether or not a regulator is supplied, you
should always determine if it is the proper regulator
for the specific application. A regulator must be
connected to propane tank so that gas pressure is
regulated at all times. Contact your gas supplier, or
the L. B. White Co., Inc. if there are any questions.
20. On a two-stage regulator system, the pressure
between first and second-stage regulators should not
exceed 5 psi (345 MBAR). Both regulators normally
should be mounted outside and they must be
covered.
21. It is extremely important that any regulator outside
the building be protected against the weather,
particularly ice formation. Ice formation can lead to
overpressurization of the regulator and subsequent
gas leaks. See codes covering proper protection.
22. Propane gas is heavier than air and will accumulate
in low areas causing a hazard. Therefore, tanks and
equipment should not be used where the gas could
accumulate and be a hazard.
23. The heater will not function properly unless the gas
pressure is properly regulated. Under no
circumstance should the gas pressure to the heater
exceed the burner manifold pressure rating on the
heater nameplate and owner's manual as high
pressure can cause gas leaks or an overheating of
the appliance.
24. This heater is designed for propane vapor. The
heater must never use liquid in an propane gas
application. If you are in doubt, contact the
L. B. White Co., Inc.
25. Corrosive atmospheres may cause component
failure. Animal confinement buildings are one
example of a corrosive atmosphere.
26. Eventually, like all electrical/mechanical devices, the
thermostat can fail. Thermostat failure may result in
either an underheating or overheating condition
which may damage critical products and/or cause
animal injury or death. Critical products and/or
animals should be protected by a separate back-up
control system that limits high and low temperatures
and also activates appropriate alarms.
27. Take time to understand how to operate and
maintain the heater using the owner’s manual and
your expertise as a guide. Determine how to how
shut off gas to the building and also to the individual
heater. Contact your propane gas supplier if you
have any questions.
28. Any defects found in performing any of the
service procedures must be eliminated and
defective parts replaced immediately. Retest the
heater before placing heater
back into service.
29. ALWAYS make sure the gas supply lines have been
properly purged of any contaminants (sand, pipe
cutting oil, pipe thread shavings, etc.) prior to
installation of the appliance. Use compressed air to
blow out sections of line. NEVER USE PRESSURIZED
FUEL GAS
9
GENERAL IINFORMATION
a. Black iron pipe only was used in this example as it
is less expensive per foot than copper tubing and
therefore more commonly used. However, the
same selection process using copper tubing may
be done if so desired. Refer to pipe sizing tables
specifically for copper tubing (not within this
manual). Piping planning and installation must be
done by an experienced qualified propane gas
installation agency.
b. Also, the minimum pipe size normally used in many
situations is 1/2 in. (12.7 MM) nominal. Though
smaller diameters may be available, diameters less
than 1/2 in. (12.7 MM) are normally not stocked at
L.P. gas dealers and would therefore be special
ordered, adding to overall cost.
c. The information in the pipe sizing tables was taken
from Engineered Control International, Inc., L.P. Gas
Serviceman’s Manual L545.
d. Do not attempt gas supply line selection or
installation unless you are properly trained and
qualified.
e. All gas supply lines must be leak checked after
installation and when pressurized to provide a safe
installation. Only use a certified, approved leak
detection liquid, or an ammonia-free soapy water
solution.
f. This is just one example showing how to size piping
for a building. Installation layouts differ as do the
pressures being supplied to piping, whether you are
piping for propane gas or natural gas and the
material (pipe or copper tubing) being used. Always
PIPE SIZING

REGULATOR TANK PRESSURE
REDUCED TO 5 PSIG (345 MBAR)
TANK
REGULATOR SECOND STAGE 5 PSIG (345 MBAR) INLET
300' (91.4m)
QUATITY 6 - 50,000 BTUH HEATERS (14,654 WATTS)
TOTAL LOAD = 300,000 BTUH (87,925 WATTS)
40'
(12.2M)
20'
(6M)
50'
(15.2M)
50'
(15.2M)
30'
(9.1M)
30'
(9.1M)
50'
(15.2M)
50'
(15.2M)
50'
(15.2M)
20'
(6M)
A
B
C
DGH
EF
have an experienced gas installation agency size and
install all fuel gas piping.
Pipe sizing is critical to the proper operation of any gas
heating system. However, piping is dependent on several
factors:
1. Total gas load expressed in BTUH.
2. The gas pressure to be supplied through the piping
system. This pressure may be expressed in pounds
of pressure per square inch (P.S.I.) or (BAR) or inches
of water column or (MBAR).
3. Distance that the gas must travel to feed the
appliance furthest from the regulator.
This section will explain to you how to size piping for the
heaters through the use of pipe sizing tables and a typical
example. In all cases with this example, we will be using
only pounds of pressure, expressed as 5 psig (345 BAR)
and not inches of water column.
INSTRUCTIONS
a. Determine total gas demand for entire system, by
adding up BTU/hr. input from appliance nameplates
and adding demand for any future appliances.
b. Measure the length of piping required from outlet of
first stage regulator to the appliance furthest away.
No other length is necessary to do the sizing. In this
example the distance from first stage regulator to
appliance furthest away is 230 ft. (70.10 M)
c. Make a sketch of the piping system and installation.
See Fig. 1.
EXAMPLE
(Refer ttoFFig. 22)
IMPORTANT: If exact length is not on chart, use next longer
length. Select the size of pipe that shows at least as much
capacity as needed for each piping section.
a. Section A to B of pipe must supply the complete gas
load of 300,000 BTUH (87930 WATTS) for the entire
building. Looking at the 5 PSIG (345 MBAR) sizing
chart, the size of pipe used in conveying gas would
need to be sized at 1/2 inch (19 MM) diameter pipe.
Note that even though furthest distance from first
stage regulator to appliance is 230 ft. (70 M), we use
the 250 ft. (76 M) length.
b. Section B to C must supply the load of 200,000
BTUH (58620 WATTS). Select 1/2 inch (12.7 MM)
pipe for Section B to C.
c. Section C to D must supply a load of 150,000 BTUH
(43960 WATTS). Select 1/2 inch (12.7 MM) pipe for
Section C to D.
d. Section D to E must supply a load of 100,000 BTUH
(29310 WATTS). Select 1/2 inch (12.7 MM) pipe.
e. Sections E to F must supply 50,000 BTUH (14650
WATTS) Select 1/2 inch (12.7 MM) pipe.
f. Sections B to C must supply 100,000 BTUH (29310
WATTS). Use 1/2 inch (12.7 MM) pipe.
g. The final section, G to H, needs only 50,000 BTUH
(14650 WATTS) for gas usage. This section would
use 1/2 inch (12.7 MM) pipe.
FIG. 1
10

FIG. 2 EXAMPLE
Perform pipe sizing for building.
Total heat load is 300,000 BTUH (87930 WATTS).
Quantity 6 - 50,000 BTUH (14650 WATTS) heaters.
Building is 300 ft. (91 M) long x 40 ft. (12.2 M) wide.
Section BTUH (WATTS) LP Gas Pipe Size
Gas Load @ 5 PSI (345 MBAR)
A - B 300,000 (87930) 1/2 in. (12.7 MM)
B - C 200,000 (58620) 1/2 in. (12.7 MM)
C - D 150,000 (43960) 1/2 in. (12.7 MM)
D - E 100,000 (29310) 1/2 in. (12.7 MM)
E - F 50,000 (14650) 1/2 in. (12.7 MM)
B - G 100,000 (29310) 1/2 in. (12.7 MM)
G - H 50,000 (14650) 1/2 in. (12.7 MM)
First SStage PPipe SSizing
5 PSIG (345 MBAR) Inlet with a 1 PSIG (69 MBAR) Pressure Drop
Maximum capacity of pipe or tubing, in thousands of BTU/hr. (kilowatt hour) of propane gas.
IMPORTANT: If exact length is not on chart, use next longer length. Select the size of pipe that shows at least as much capacity as needed
for each piping section.
Pipe Size Length of Pipe
In Inches (MM) In Feet* (Meters)
10 (3M) 20 (6 M) 30 (9 M) 40 (12 M) 50 (15 M) 60 (18.3 M) 70 (21.3 M) 80 (24.4 M) 90 (27.4 M) 100 (30.5 M)
1/2 2946 2025) 1626 1392 1233 1118 1028 957 897 848
(12.7 MM) (863 KW) (593 KW) (477 KW) (408 KW) (361 KW) (328 KW) (301 KW) (280 KW) (263 KW) (249 KW)
3/4 6161 4234 3400 2910 2579 2337 2150 2000 1877 1773
(19 MM) (1805 KW) (1241 KW) (997 KW) (853 KW) (756 KW) (685 KW) (630 KW) (586 KW) (550 KW) (520 KW)
1 11605 7976 6405 5482 4859 4402 4050 3768 3535 3339
(25.40 MM) (3401 KW) (2338 KW) (1877 KW) (1607 KW) (1424 KW) (1290 KW) (1187 KW) (1104 KW) (1036 KW) (979 KW)
125 (38 M) 150 (45.7 M) 175 (53.3 M) 200 (61 M) 225 (68.6 M) 250 (76.2 M) 275 (83.8 M) 300 (91.4 M) 350 (107 M) 400 (12.2 M)
1/2 751 681 626 583 547 516 490 468 430 400
(12.7 MM) (220 KW) (200 KW) (183 KW) (171 KW) (160 KW) (151 KW) (144 KW) (137 KW) (126 KW) (117 KW)
3/4 1571 1424 1310 1218 1143 1080 1026 978 900 837
(19 MM) (460 KW) (417 KW) (384 KW) (357 KW) (335 KW) (317 KW) (301 KW) (287 KW) (264 KW) (245 KW)
1 2956 2682 2467 2295 2153 2034 1932 1843 1696 1577
(25.40 MM) (866 KW) (786 KW) (723 KW) (673 KW) (631 KW) (596 KW) (566 KW) (540 KW) (497 KW) (462 KW)
* Total length of piping from outlet of first stage regulator to inlet of second stage regulator (or to inlet of second stage regulator furthest away).
Optional Accessory.
Appearance of the outlet on heater may vary from model to model.
TABS
DIVERTER
HALVES
OUTLET
SCREWS
FORMED
OUTLET GUARD
NOTCHES IN MOUNTING TABS
1. Optional air diverters can be installed in the heater
outlet to provide direction to the heated air as it exits
the heater. Installation options include installing the
diverters in such a way as to broadly distribute the air
in two 45 degree paths or to focus the air flow in one
45 degree direction. See Fig. 3.
2. The air diverter’s tabs on each half will pop into the
blower outlet between the inside of the case assembly
and the blower housing outlet. If the notched tabs do
not pop into the blower outlet, loosen (do not remove)
the blower outlet screws. Doing this provides a gap
into which you can insert the tabs. Retighten the
screws after installation.
FIG. 3 (Typical installation allowing two directions of air movement.)
Alternate Air Diverter Installations
AIR DIVERTER
INSTALLATION INSTRUCTIONS
11

HANGING INSTRUCTIONS
12
EYEBOLT
NUT
FLAT WASHER
CAGE NUT
CHAIN
CASE TOP
1. Assemble according to the illustration and tighten all
eyebolts securely. (See Fig. 4):
FIG. 4
2. Be sure heater is securely fastened and is hanging
level. (Check crosswise and lengthwise.)
3. See Fig. 5 for typical indoor installation. In any animal
confinement building, consideration must be given to
making sure the heater is located away from the
livestock so that livestock cannot knock the heater,
tear it loose from its mounting, or damage the heater
or its gas supply line in any way. Make sure you
observe and obey minimum clearance distances to
combustible materials as stated in the specification
section of this owner’s manual and on the heater
itself.
FIG. 5
NOTE: REGULATORS SHOULD ALWAYS BE MOUNTED OUTDOORS. IF
CIRCUMSTANCES FORCE INSTALLING THE REGULATOR INDOORS,
THE REGULATOR'S VENT MUST BE VENTED OUTDOORS USING VENT
LINE NO SMALLER THAN VENT OPENING.
VENT OF REGULATOR MUST
POINT DOWN AND REGULATOR
MUST BE VENTED OUTDOORS
MANUAL SHUT-OFF VALVE
CAN BE INSTALLED BEFORE
THE REGULATOR, UNDER
THE EAVE OF THE BUILDING,
OR AFTER THE REGULATOR
INSIDE THE BUILDING.
OPTIONAL INDOOR
REGULATOR
MOUNTING LOCATION
GAS HOSE
THERMOSTAT
CORD
YOKE
HEATER
THERMOSTAT 30.5CM 30.5CM
BLACK PIPE
THROUGH WALL
VENT LINE
WALL OUTLET
POWER CORD
SEDIMENT
TRAP
WALL
CHAIN OR CABLE
AIR DIVERTER

SEDIMENT TRAP ASSEMBLY
NIPPLE
HOSE ADAPTER
TEE
NIPPLE
CAP
TO GAS CONTROL
VALVE INLET
Assemble the tee, nipples and cap together and tighten
securely. See Fig. 6. The sediment trap assembly must
always be mounted in a vertical position. Make sure pipe
thread compound that is resistant to both propane gas and
natural gas is used in making all connections. Check aall
connections ffor ggas lleaks uusing aapproved ggas lleak
detectors.
FIG. 6
REGULATOR
NIPPLE
VALVE, MANUAL
SHUT-OFF
GAS HOSE
ADAPTER
SEDIMENT TRAP
TO CONTROL
VALVE INLET
REGULATOR VENT
GAS FLOW
13
MANUAL SHUT-OFF VALVE, HOSE
AND REGULATOR ASSEMBLY
1. Always use approved pipe thread compound suitable
for use with propane gas or natural gas on the
threaded connections.
2. Assemble the components together according to the
figure. This view is to show general assembly of the
components only. The regulator must always be
mounted so its vent, regardless of location on the
regulator, is always pointed downward.
3. Tighten all connections securely.
4. Check aall cconnections ffor ggas lleaks uusing aapproved
gas lleak ddetectors.
FIG. 7

PILOT BUTTON
POWER UNIT
If the heater is to be shut down for cleaning, maintenance or
repair, follow steps 1 - 5. Otherwise, simply turn thermostat
to “off” or “no heat” for standard shut down.
1. Close all manual fuel supply valves.
2. With the heater lit, allow heater to burn off excess fuel
in gas supply hose.
3. Turn the indicator on the gas control to “off”.
4. Turn thermostat to “off” or “no heat” position.
5. Disconnect the heater from the electrical supply.
Shut-Down Instructions
14
Start-Up Instructions
1. Open all manual fuel supply valves to inlet of heater.
2. Fully depress pilot button on gas control valve and
light pilot with a match. Keep button depressed for
about 30 seconds or until pilot light stays lit. See
Fig. 8.
FIG. 8
IMPORTANT
■On new installations, there will be air trapped in the gas
supply line feeding the appliance. The air will gradually
be purged out by gas when the heater is first lit, so it
might take slightly longer to light the pilot.
■In cool or cold temperatures on initial start-up, the vinyl
cap covering the pilot button may be stiff. You may
want to remove this cap to make lighting the pilot
easier. Put the vinyl cap back on over pilot button, after
the pilot has been lit.
3. Connect the electrical cord to an approved electrical
supply.
4. Set thermostat to desired room temperature. The
heater will light.
5. If gas flame is interrupted and flame goes out, wait a
minimum of five minutes, or until gas clears away
before relighting.
6. Do not exceed input rating stamped on nameplate of
appliance, or manufacturer’s recommended burner
orifice pressure for size orifice(s) used.

WARNING
This heater must not be washed. Use of a pressure
washer, water or liquid cleaning solution on this heater
can cause severe personal injury or property damage due
to water and/or cleaning solution:
A. In electrical components, connections and wires
causing electrical shock or component failure.
B. On gas control components causing corrosion which
can result in gas leaks and fire or explosion from the
leak.
The heater must be cleaning in accordance with the
manufacturer’s instructions without being subjected to
liquid spray or wetting.
1. Have your gas supplier check all gas piping annually
for leaks or restrictions in gas lines. Also, at this time
have your gas supplier clean out the sediment trap of
any debris that may have accumulated.
2. The aappliance aarea sshall bbekkept cclear aand ffree ffrom
combustible mmaterials, ggasoline, aand oother fflammable
vapors aand lliquids.
3. Regulators can wear out and function improperly.
Have your gas supplier check the date codes on all
regulators installed and check delivery pressures to
the appliance to make sure that the regulator is
reliable.
4. Regulators must be periodically inspected to make
sure the regulator vents are not blocked. Debris,
insects, insect nests, snow, or ice on a regulator can
block vents and cause excess pressure at the
appliance.
1. Before cleaning, shut off all gas supply valves and
disconnect electrical supply.
2. The heater should have dirt or dust removed
periodically:
a. After each use, give the heater a general cleaning
using compressed air or a soft brush on its interior
and exterior. At this time, dust off the motor case
to prevent the motor from over-heating and
shutting the heater down.
b. At least once a year, give the heater a thorough
cleaning. At this time, remove the fan and motor
assembly and brush or blow off the fan wheel,
giving attention to the individual fan blades.
Additionally, make sure the burner air inlet venturi
ports and the “throat” of the casting are free of
dust accumulation and the area between the heat
chamber top and inside case is also free of dust.
c. Observe and obey the Warning within these
Cleaning Instructions. This same Warning is also
supplied on the heater.
15
Cleaning Instructions
Maintenance Instructions
WARNING
Fire, BBurn, aand EExplosion HHazard
■This heater contains electrical and mechanical components in the gas management, safety and airflow systems.
■Such components may become inoperative or fail due to dust, dirt, wear, aging, or the corrosive atmosphere of an
animal confinement building.
■Periodic cleaning and inspection as well as proper maintenance are essential to avoid serious injury or property
damage.

BRACKET, PILOT (W/ORIFICE)
SHIELD, PILOT
SCREWS
BURNER CASTING
ORIFICE, PILOT
THERMOCOUPLE, 21 IN.
TUBING, PILOT W/NUTS
1. Shut off gas supply to appliance inlet.
2. Disconnect heater from electrical supply.
3. Let the heater cool down so pilot assembly is cool to
touch.
4. Remove upper screw on pilot assembly. Loosen
lower screw.
5. Pull up on the pilot shield exposing pilot bracket, pilot
orifice, and thermocouple.
6. Using a soft brush or compressed air, clean pilot
stack of dust and dirt, paying particular attention to
the throat of the pilot stack and the flame spreader
at the top of the stack.
7. Brush off top of pilot orifice making sure dust and
dirt have not plugged orifice hole. If orifice must be
removed, loosen the compression fitting and pilot
tube from the inlet of the pilot orifice. Loosen the
pilot orifice from the pilot bracket. Hold orifice up to
the light to see if the hole in the orifice is clear and
open. If not, blow out with compressed air.
8. To replace shield and pilot orifice, reverse above
procedure.
9. Check for gas leaks.
FIG. 10
PILOT LIGHT ASSEMBLY
1. Shut off gas supply to heater.
2. Disconnect heater from electrical supply.
3. Remove access panel on air inlet end of heater on
case assembly.
4. Remove thermostat cover and disconnect motor
leads from wire nut and thermostat.
5. Remove nuts that secure square motor mounting
plate to “L” bolts on housing.
6. Remove four (4) screws that secure motor mounting
plate to housing.
7. Pull motor, mounting plate and fan assembly from
housing.
8. Loosen set screw(s) on fan wheel with appropriate
wrench.
9. Pull fan wheel from motor shaft. Use wheel puller if
necessary.
10. Remove four (4) nuts securing motor to mounting
plate.
11. To replace, reverse above procedure.
NOTES: 1. Fan wheel to motor mount clearance must be
adjusted to 6.35 MM clearance before
tightening fan wheel to motor shaft.
2. Make sure that set screw(s) of fan are on “flats”
of motor shaft when tightening.
FIG. 9
Service Instructions
MOTOR AND FAN WHEEL ASSEMBLY
MOTOR MOUNT PLATE FAN WHEEL
CLEARANCE
MOTOR
IMPORTANT
The hole in the pilot orifice is drilled to a specific diameter
to match the fuel and gas pressure being used. Do not
poke or push sharp instruments into the hole. Doing so
will enlarge the hole, creating pilot light outage problems.
Clean the orifice only with the compressed air, soft brush,
or a dry rag. If necessary, replace the pilot orifice.
Do not use a pliers to remove the pilot orifice. A pliers will
“round off” the hex head nut on the base of the orifice,
creating difficulty in servicing at a later time. Only use a
wrench.
16

PILOT ASSEMBLY
OPTIONAL ATTACHMENT NUT
THERMOCOUPLE LEAD
POWER UNIT
THERMOCOUPLE LEAD
CONNECTOR NUT
POWER UNIT
CONNECTOR CONTACT
THERMOCOUPLE
TIP
GAS VALVE
1. Shut off gas supply to heater inlet.
2. Disconnect heater from electrical power source.
3. Let the heater cool down so pilot assembly is cool to
touch.
4. Remove upper screw on pilot assembly. Loosen, do
not remove, lower screw.
5. When loosened, pull up on the pilot shield, thereby
exposing the pilot bracket, pilot orifice, and
thermocouple.
6. The thermocouple is located to the right of the pilot
orifice secured in place to the pilot bracket by either
a push-in mounting clip or attachment nut.
7. To remove the thermocouple from the bracket, simply
pull down on the thermocouple’s copper tubing, or if
the thermocouple uses an attachment nut, loosen
the nut (turn counterclockwise) until the nut is
entirely out of the pilot bracket.
8. Loosen and remove the lead connector nut threaded
into the power unit on the gas control valve.
9. To assemble, reverse above procedure.
THERMOCOUPLE
IMPORTANT
If your thermocouple has a push-in mounting clip, make sure
on reassembly that the thermocouple is pushed in completely,
as far as it can go, into the pilot bracket. Failure to do so may
cause pilot outage problems.
When threading the thermocouple’s connector nut back into
the gas control valve, thread the nut in finger tight and snug it
in place. DO NOT OVERTIGHTEN OR USE UNNECESSARY
FORCE ON THE NUT WHEN TIGHTENING.
Do not use pliers when removing or replacing the
thermocouple. Doing so will round off the attachment nuts,
making servicing difficult later on. Always use a wrench.
FIG. 11
RESET BUTTON
SENSING
SURFACE
TERMINAL
FLAME
MOUNTING
LEG
The high limit switches should be tested a minimum of once
per year when the heater is given a thorough cleaning.
1. Disconnect the heater from its electrical supply.
2. Remove the high limit switch from the heat chamber.
3. Holding the switch by one of its mounting legs, apply a
small flame only to the sensing portion on the back of
the switch. Be ccareful nnot ttommelt tthe pplastic hhousing
of tthe sswitch wwhen cconducting tthis ttest.
4. Within a minute, you should hear a “pop” coming from
the switch, which indicates the contacts of the switch
have opened.
5. Allow the switch cool down for about a minute before
firmly pressing the reset button on the switch.
6. Check for electrical continuity across the switch
terminals to make sure the contacts have closed.
7. Reinstall the switch back into the heater. Reconnect
the heater to its electrical supply. Start the heater and
check for proper operation.
FIG. 12
TESTING MANUAL RESET
HIGH LIMIT SWITCH
WARNING
Fire HHazard
■Do not operate the appliance with the high limit switch
bypassed.
■Operating the heater bypassed high limit switch may
lead to overheating, possibly resulting in a fire, with
subsequent damage to the heater, building damage, or
loss of livestock.
17

OUTLET PRESSURE TAP
LOW PRESSURE GAUGE
18
1. Brush off any accumulation of dust that might be
found near or on the valve.
2. Check manifold gas pressure with a low pressure gas
gauge or water manometer.
a. Shut off gas supply to inlet of heater.
b. Disconnect heater from electrical supply.
c. Using adjustable wrench, remove pressure tap
located at valve outlet.
d. Thread in pressure gauge adapter and tighten.
e. Turn on fuel supply and reconnect heater to
electrical supply.
f. When heater lights, the gas gauge will read 11
in. W.C. (27.5 MBAR) gas pressure. This
pressure is the flowing gas pressure necessary
for the heater to deliver the maximum input
rating as indicated for each model on page 4.
If gauge does not indicate proper manifold
pressure, check inlet pressure to the gas
control valve. Maximum and minimum
acceptable inlet pressures to gas control valve
are shown in the heater specifications table.
(See page 4.) The inlet pressure may need
adjustment as necessary to achieve proper
outlet pressure.
g. After pressure have been checked, shut off gas
supply and electrical service to heater, remove
gauge, install pressure tap plug and tighten
plug securely. Turn on gas supply and
reconnect heater to electrical supply.
FIG. 13
PRESSURE CHECKS
WARNING
Do not attempt to disassemble or replace components
on the gas control valve. Gas control valve components
are not available separately. If any component of the
valve is defective, the valve must be replaced in its
entirety. Failure to do so may result in fuel gas leakage,
leading to fire or explosion, personal injury or death.
WARNING
The pilot button on the gas control valve works with
normal finger pressure only. Do not force button with
tools. Forcing button can result in leakage of fuel gases,
leading to fire or explosion, personal injury or death. If
button cannot be depressed with normal finger pressure,
replace the valve.

XI. TROUBLESHOOTING DATA
FOR STANDING-PILOT HEATERS
Following this “Troubleshooting Data” section is a page illustrating typical pilot flame problems.
Use this as a guide in conjunction with the following information when troubleshooting pilot light problems.
PROBLEMS CAUSES REMEDIES
1. Pilot will not light. * Propane gas tank empty. * Fill propane gas tank.
* Single-stage regulator supplied with * Remove improper regulators.
heater not used accordingly.
* Gas supply valve closed. * Open supply valve.
* Pilot control valve not fully depressed. * Be sure pilot control valve is fully
depressed.
* Restriction in gas hose. * Replace hose.
* Pilot light orifice plugged. * Clean or replace pilot light orifice.
* Air in gas line. * Depress pilot button on pilot control valve
to bleed the air from the gas line. Usually
necessary at time of installation.
* Excess flow valve in P.O.L. stem * Close propane gas tank valve, wait 10
closed. minutes and reopen valve slowly.
* Gas control valve defective. * Replace gas control valve.
2. Pilot light will not stay lit when pilot * Restriction in gas hose. * Replace hose.
control valve is released.
* Insufficient time allowed for pilot light * Hold in pilot button 30 - 60 seconds to
to warm up thermocouple. allow thermocouple to heat up properly.
* Loose thermocouple. * Tighten thermocouple.
* Defective thermocouple. * Replace thermocouple.
* Pilot light frame dirty. * Clean pilot light frame. Pilot flame
should envelop end of thermocouple.
* Pilot light orifice partially plugged. * Clean or replace pilot light orifice.
* Defective pilot control valve. * Replace pilot control valve.
3. Pilot light will not stay lit when main * Improper gas pressure. * Set pressure according to nameplate
burner and blower are operating. on heater.
* Pilot light orifice partially plugged. * Replace pilot orifice.
* Gap between pilot shield and burner * Pilot shield should not have gap between
may be too wide, allowing pilot flame shield and burner. Replace shield.
to be pulled away from thermocouple.
* Loose thermocouple. * Tighten thermocouple connection.
* Weak or defective thermocouple. * Replace thermocouple.
* Defective pilot assembly. * Replace pilot assembly.
4. Heater blowing cold air with pilot * Propane gas tank empty. * Fill propane gas tank.
light out.
* High-limit heat switch open. * See Problem Number 6.
* Obstruction in gas hose. * Clean the gas hose, using compressed air.
* Freeze up of propane gas tank. * Use larger propane gas tank. Keep tank
full on cold nights.
* Pilot light orifice holes plugged. * Clean or replace pilot orifice.
* Gas supply line too long. * Hose longer than 10 feet cannot be used.
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5. Heater blowing cold air with * High-limit switch open. * See Problem Number 6.
pilot light burning.
* Defective solenoid in gas control valve. * Replace gas control valve.
* Burner orifice plugged. * Clean orifice with compressed air.
* Throat of burner casting plugged. * Clean burner throat with compressed air.
6. High limit switch open. * Defective high limit switch. * Replace high limit switch.
* Wrong gas type, pressure too high, * Check the dataplate on heater for
liquid propane in gas line due to correct type of gas and the operating
improper regulation and/or line size. pressure. Correct as necessary.
* Loose fan wheel. * Tighten fan wheel.
* Dirty fan wheel. * Clean fan wheel.
* Motor overheating and * Thermal overload switch in
shutting off. motor opening due to:
a. Low voltage-check voltage supply
against unit voltage requirements.
b. Dirty motor-clean motor housing.
* Blockage at blower outlet or inlet. * Remove blockage.
* Defective high-limit heat switch. * Replace high-limit heat switch.
7. Main burner does not shut * Defective gas valve. * Replace gas valve.
off when temperature requirement
is satisfied. * Defective thermostat. * Replace thermostat.
8. Gas valve "chatters". * Defective solenoid in gas valve. * Replace gas valve.
* Gas pressure too high. * Check nameplate on heater for correct
type of gas and operating pressure.
* Improper voltage. * Check voltage supply against
unit voltage requirements.
9. Motor “hums” * Defective capacitor. * Replace capacitor.
* Wires disconnected between motor * Reconnect wires accordingly
and capacitor. and test for proper operation.
10. Motor does not run. * No voltage from thermostat to motor. * Check for voltage at power supply.
Repair as necessary.
* Defective thermostat. * Replace thermostat.
* Defective capacitor. * Replace capacitor.
* Defective motor. * Replace motor.
(1) With any electrical problem, all wiring should be checked for good connections and proper voltage and repaired if a problem is
found.
(2) To determine if part is defective, place a jumper wire across the two terminals that the wires are connected to. Use the jumper wire
only to determine if part is defective. Replace the part IMMEDIATELY or do not operate unit until properly serviced. NEVER
operate a heater with safety device bypassed.
(3) The high-limit switch will open or “trip” for a variety of reasons including high fuel pressure (see nameplate or owner’s manual for
proper pressures) or reduced air flow. Reduced air flow is normally due to intake air obstructions, low voltage or dirty fan wheels,
etc.
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