L.B. White Tradesman CP400 Manual

Butane Propane
Vapor
Withdrawal
Congratulations!
You have purchased the finest portable forced air 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 [phone].
Owner's Manualand Instructions
Portable Forced Air Heater
View this manual online at www.lbwhite.com
MODEL OUTPUT (Btuh) FUEL
CP400 400,000
150-30822 REV.A
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with your smartphone or
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to view maintenance
videos for L.B.White heaters.*
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Please refer to important elevation
information on inside cover.
ATTENTION ALL USERS
This heater has been designed and evaluated by the L.B. White Co., Inc. according
to the applicable standards for gas fired heaters as a direct gas - fired portable
forced air heater. This manual includes all options available for this heater, such as
heat/vent switch, variable rate valve, and thermostat.
CHECK WITH YOUR LOCAL FIRE SAFETY AUTHORITY, YOUR LOCAL FUEL GAS
SUPPLIER, OR THE L.B. WHITE COMPANY IF YOU HAVE QUESTIONS REGARDING
APPLICATIONS.

2
WARNING
nStandard products are manufactured to operate
at optimum efficiency at elevations between 0
and 2,000 ft (610 m) above sea level.
nIf operated at higher elevations the product will
not function correctly and may function in an
unsafe nature.
nProducts providing proper operation for alternate
elevations may be available.
nyou require a high elevation product, did not
specify when ordering, and/or the box this unit
came in does not have an alternate designation
sticker, please contact Technical Support.
WARNING
FIRE AND EXPLOSION HAZARD
nNOT FOR HOME OR RECREATIONAL VEHICLE USE.
nINSTALLATION OF THIS HEATER IN A HOME OR
RECREATIONAL VEHICLE MAY RESULT IN A FIRE
OR EXPLOSION.
nFIRE 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, BURN, INHALATION, AND
EXPLOSION HAZARD
nKEEP SOLID COMBUSTIBLES A SAFE
DISTANCE AWAY FROM THE HEATER.
nSOLID COMBUSTIBLES INCLUDE WOOD,
PAPER, OR PLASTIC PRODUCTS,
BUILDING MATERIALS AND DUST.
nDO NOT USE THE HEATER IN SPACES
WHICH CONTAIN OR MAY CONTAIN
VOLATILE OR AIRBORNE COMBUSTIBLES.
nVOLATILE OR AIRBORNE COMBUSTIBLES
INCLUDE GASOLINE, SOLVENTS, PAINT
THINNER, DUST PARTICLES OR UNKNOWN
CHEMICALS.
nFAILURE TO FOLLOW THESE
INSTRUCTIONS MAY RESULT IN A FIRE OR
EXPLOSION.
nFIRE OR EXPLOSIONS CAN LEAD TO
PROPERTY DAMAGE, PERSONAL INJURY
OR DEATH.
GENERAL HAZARD WARNING
nFAILURE 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
nREAD THIS OWNER’S MANUAL BEFORE
INSTALLING OR USING THIS PRODUCT.
nPERSONS WHO CAN READ, UNDERSTAND, AND
FOLLOW THE INSTRUCTIONS SHOULD USE OR
SERVICE THIOS HEATER.
nSAVE THIS OWNER’S MANUAL FOR FUTURE USE
AND REFERENCE.
nOWNER’S MANUALS AND REPLACEMENT LABELS
ARE AVAILABLE AT NO CHARGE. SEE WEBSITE, OR
FOR ASSISTANCE, CONTACT L.B. WHITE AT 1-800-
345-7200.
WARNING
nPROPER GAS SUPPLY PRESSURE MUST BE
PROVIDED TO THE INLET OF THE HEATER.
nREFER TO DATA PLATE FOR PROPER GAS
SUPPLY PRESSURE.
nGAS PRESSURE IN EXCESS OF THE
MAXIMUM INLET PRESSURE SPECIFIED AT
THE HEATER INLET CAN CAUSE FIRES OR
EXPLOSIONS.
nFIRES OR EXPLOSIONS CAN LEAD TO
SERIOUS INJURY, DEATH, OR BUILDING
DAMAGE.
nGAS PRESSURE BELOW THE MINIMUM
INLET PRESSURE SPECIFIED AT THE
HEATER INLET MAY CAUSE IMPROPER
COMBUSTION.
nIMPROPER COMBUSTION CAN LEAD TO
ASPHYXIATION OR CARBON MONOXIDE
POISONING AND THEREFORE SERIOUS
INJURY OR DEATH.

SECTION PAGE
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Heater Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Installation and Assembly Instructions
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
LPG Supply Sizing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Handle Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Hose and Regulator Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Connecting Regulator to Gas Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Start-Up Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Shut-Down Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Variable Rate Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Cleaning Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Maintenance Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Service Instructions
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Motor, Fan, and Air Proving Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Auto Reset Backflash Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Variable Rate Valve and Gas Control Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Igniter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Burner Orifice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Ignition Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Heat/Vent Selector Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Gas Pressure Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Troubleshooting Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Electrical Connection and Ladder Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Heater Component Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Parts Identification
Parts Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Warranty Policy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Replacement Parts and Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Table of Contents
General Information
This Owner's Manual includes all options and accessories
commonly used on this heater.
When calling for technical service assistance, or for other
specific information, always have model number,
configuration number and serial number available. This
information is contained on the dataplate.
This manual will instruct you in the operation 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 gas supply line installation, installation of the heater,
and repair and servicing of the heater requires continuing
expert training and knowledge of gas heaters and should
not be attempted by anyone who is not so qualified. See
page 6 for definition of the necessary qualifications.
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.
3

Maximum / Minimum Input (BTUH) 400,000/235,000
4.0
4.0
4.0
18.5
11.6
4.0
1.5
TOP 7 ft.
SIDES 5 ft.
BACK 5 ft.
BLOWER
OUTLET
GAS SUPPLY
34 1/4 x 12 5/8 x 21 3/4
1/5 H.P., 3,300 RPM
Sleeve Bearing
CP400
Butane Propane Gas
6 ft. (1.83 m)
SPECIFICATIONS
Model
Electrical Supply
(Volts/Hz/Phase)
Amp Draw
Dimensions (Inches)
L x W x H
Minimum Safe
Distances From
Nearest
Combustible
Materials
STARTING
CONTINUOUS
OPERATION
Fuel Consumption Per Hour (lbs.)
Inlet Gas Supply
Pressure Acceptable at
the Gas Connection (PSI)
MAX.
MIN.
15 ft.
115/60/1
Heater Specifications
Fuel Type
Burner Manifold Pressure (PSI)
4
Motor Characteristics
MAX.
MIN.

LPG has a man-made odorant- added specifically for detection of fuel gas leaks.
If a gas leak occurs, you should be able to smell the fuel gas.
THAT’S YOUR SIGNAL TO GO INTO IMMEDIATE ACTION!
nDo 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.
nGet everyone out of the building and away from the area
immediately.
nClose all LPG tank or cylinder fuel supply valves.
nLPG 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.
nUse your neighbor’s phone and call your fuel gas
supplier and your fire department. Do not re-enter the
building or area.
nStay out of the building and away from the area until
declared safe by the firefighters and your fuel gas
supplier.
nFINALLY, 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.
nSome people cannot smell well. Some people cannot
smell the odor of the man-made chemical added to
LPG. You must determine if you can smell the odorant
in this gas.
nLearn to recognize the odor of LPG. Local LPG dealers
will be more than happy to give you a scratch and sniff
pamphlet. Use it to become familiar with the fuel gas
odor.
nSmoking can decrease your ability to smell. Being
around an odor for a period of time can affect your
sensitivity to that particular odor.
nThe odorant in LPG is colorless and the intensity of its
odor can fade under some circumstances.
nIf there is an underground leak, the movement of gas
through the soil can filter the odorant.
nLPG odor may differ in intensity at different levels.
Since LPG is heavier than air, there may be more odor at
lower levels.
nAlways be sensitive to the slightest gas odor.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.
5
Safety Precautions
FUEL GAS ODOR
ODOR FADING -- NO ODOR DETECTED
ATTENTION -- CRITICAL POINTS TO REMEMBER!
nLPG has a distinctive odor. Learn to recognize these
odors. (Reference Fuel Gas Odor and Odor Fading
sections above.
n
If you have not been properly trained in repair and service
of LPG heaters, then do not attempt to light heater,
perform service or repairs, or make any adjustments to
the heater on the LPG fuel system.
nEven if you are not properly trained in the service and
repair of the heater, ALWAYS be consciously aware of
the odor of propane gas.
nA 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!
WARNING
nDo not use this heater for heating human living
quarters.
nDo not use in unventilated areas.
nThe flow of combustion and ventilation air must not be
obstructed.
nProper ventilation air must be provided to support the
combustion air requirements of the heater being used.
nLack of proper ventilation air will lead to improper
combustion.
nImproper combustion can lead to carbon monoxide
poisoning leading to serious injury or death. Symptoms
of carbon monoxide poisoning can include headaches,
dizziness and difficulty in breathing.
nProper ventilation air for combustion must be provided
in accordance with OSHA 29 CFR 1926.154, Temporary
Heating Devices, ANSI A10.10, Safety Requirements for
Temporary and Portable Space Heating Devices, or the
Natural Gas and Propane Installation Code, CAN/CSA
B149.1 as appropriate.
Asphyxiation Hazard

1. Do not attempt to install, repair, or service this heater
or the gas supply line unless you have continuing
expert training and knowledge of gas heaters.
Qualifications for service and installation of this
equipment are as follows:
a. To be a qualified gas heater service person, you
must have sufficient training and experience to
handle all aspects of gas-fired heater installation,
service and repair. This includes the task of
installation, troubleshooting, replacement of
defective parts and testing of the heater. You
must be able to place the heater into a continuing
safe and normal operating 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 and tank
size to be used. This must be done in accordance
with all local, state and national codes as well as
the manufacturer’s requirements.
2. All installations and applications of L.B. White heaters
must meet all relevant local, state and national
codes. Included are LPG, electrical, and safety
codes. Your local fuel gas supplier, a local licensed
electrician, the local fire department or similar
government agencies, or your insurance agent can
help you determine code requirements.
3. We cannot anticipate every use which maybe made
of our heaters. Check with the local fire safety
authority if you have questions about applications.
4. Once the heater has been lit, high surface and
exhaust temperatures can ignite clothing or burn
users who come too close to the heater. When the
heater is in operation, those working around the
heater should never touch the heater or come within
the clearances stated. Use extreme caution when
lighting the heater or adjusting heat levels.
5. Forced air heaters shall not be directed toward any
LPG container within 20 feet (6.10 meters).
6. Do not wash the heater. Use only compressed air, a
soft brush or dry cloth to clean the interior of the
heater and it’s components.
7. Use only the regulator supplied with the heater. The
heater must be regulated at all times for proper
operation.
8. For safety, this heater is equipped with an auto reset
backflash switch, and an air proving switch. Never
operate the heater with any safety device that has
been bypassed. Do not operate this heater unless
these features are fully functioning.
9. Do not block air intakes or discharge outlets of the
heater. Doing so may cause improper combustion or
damage to heater components leading to property
damage.
10 The hose assembly shall be visually inspected on a
daily basis after heater relocation and when the
heater is in use. If it is evident there is excessive
abrasion or wear, or if the hose is cut, it must be
replaced prior to the heater being put into operation.
The hose assembly shall be protected from building
materials, and contact with hot surfaces during use.
The replacement hose assembly shall be that
specified by the manufacturer. See parts list.
11. Check for gas leaks and proper function upon heater
installation, when relocating, and after servicing.
Refer to leak check instructions within installation
section of this manual.
12. This heater should be inspected for proper operation
by a qualified service person before each use and at
least annually.
13. Always turn off the gas supply to the heater if the
heater is not going to be used in the heating of the
work space.
14. This heater is equipped with a three-prong
(grounding) plug for your protection against shock
hazard and must be plugged directly into a properly
grounded three-prong receptacle. Failure to use a
properly grounded receptacle can result in electrical
shock, personal injury, or death.
15. If gas flow is interrupted and flame goes out, do not
relight the heater until you are that all gas that may
have accummulated has cleared away. In any event,
do not relight the heater for at least 5 minutes.
16. The heater requires a minimum 500 gallon tank for
proper gas supply pressure and operation. A larger
tank may be required depending upon temperature
conditions at the site.
17. When the heater is to be stored indoors, the
connection between the LPG supply container and
the heater must be disconnected. The container must
be stored in accordance with local codes.
18. LPG supply containers have left handed threads.
Always use the appropriate wrench to make a
connection to tighten or loosen the P.O.L. fitting at the
cylinders’ gas supply valve.
6

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. Ensure the heater is properly positioned before use.
The heater must be installed on a level, flat,and
stable surface when in operation and according to
minimum safe distances from combustible materials.
Safe distances are given on the heater dataplate and
on page 4 of this manual.
3. This heater is approved for indoor use only. The
heater shall be installed so it is not directly exposed
to water spray, rain, and /or dripping water.
4. The heater’s gas pressure regulator (with pressure
relief valve) must be protected from adverse weather
conditions (rain, ice, snow) as well as from building
materials (tar, concrete, plaster, etc.) which can affect
safe operation and could result in property damage or
injury.
5. Heaters used in the vicinity of combustible tarpaulins,
canvas, plastics, wind barriers, or similar coverings
shall be located at least 15 feet from the coverings.
The coverings shall be securely fastened to prevent
ignition or upsetting of the heater due to wind action
on the covering or other material.
6. Insure that all accessories that ship with the heater
have been and installed.
7. Check all connections for gas leaks using approved
gas leak detectors. Gas leak testing is performed as
follows:
-- Check all pipe connections, hose connections,
fittings and adapters upstream of the gas
control with approved gas leak detectors.
-- In the event a gas leak is detected, check the
components involved for cleanliness and
proper application of pipe compound before
further tightening.
-- Tighten the gas connections as necessary to
stop the leak.
-- After all connections are checked and any
leaks are stopped, turn on the main burner.
-- Stand clear while the main burner ignites to
prevent injury caused from hidden leaks that
could cause flashback.
-- With the main burner in operation, check all
connections, hose connections, fittings and
joints as well as the gas control valve inlet and
outlet connections with approved gas leak
detectors.
-- If a leak is detected, check the components
involved for cleanliness in the thread areas
and proper application of pipe compound
before further tightening.
-- Tighten the gas connection as necessary to
stop the leak.
-- If necessary, replace the parts or components
involved if the leak cannot be stopped.
-- Ensure all gas leaks have been identified and
repaired before proceeding.
8. A qualified service agency must check for proper
operating gas pressure upon installation of the
heater.
9. Always use pipe thread compund that is resistant to
propane gas on threaded connections.
10. Light according to instructions on heater or within
owner's manual.
11 Make sure the heater has the proper gas regulator for
the application. A regulator must be connected to the
gas supply so that gas pressure at the inlet to the gas
valve is regulated within the range specified on the
dataplate at all times. Contact your gas supplier, or
the L.B. White Co., Inc. if you have any questions.
12. This heater is configured for use for butane/propane
gas vapor withdrawal only. Do not use the heater in a
liquid withdrawal system or application. If you are in
doubt, contact the L.B. White Co., Inc.
WARNING
Fire and Explosion Hazard
Can cause property damage, severe injury or death
To avoid dangerous accumulation of fuel gas, turn
off the gas supply before starting the installation,
and perform a gas leak test after completion of
installation.
7
Installation and Assembly Instructions
GENERAL
WARNING
Fire and Explosion Hazard
nDo not use open flame (matches, torches, candles,
etc.) in checking for gas leaks.
nUse only approved leak detectors.
nFailure to follow this warning can lead to fires or
explosions.
nFires or explosions can lead to property damage,
personal injury or loss of life.

Assemble handle to four holes at barrel top as shown.
Tighten screws securely. FIG. 1
HANDLE ASSEMBLY
8
13. The heater must be installed so as not to interfere
with or obstruct normal exits, emergency exits, doors
and walkways.
14. Railing, fencing or suitable substitute materials must
be used to keep the heating equipment from people
using and visiting the structure.
15 . Eventually, like all electrical/mechanical devices, the
thermostat can fail. Thermostat failure may result in
an underheating condition. The thermostat should be
tested to make sure it turns the heater on and off
within a temperature differential of ±3°F.
16. Take time to understand how to operate and maintain
the heater by using this Owner’s Manual. Make sure
you know how to shut off the gas supply to the
building and also to the individual heater. Contact
your fuel gas supplier if you have any questions.
17. Any defects found in performing any of the service or
maintenance procedures must be eliminated and
defective parts replaced immediately. The heater
must be retested by properly qualified service
personnel before placing the heater back into use.
GAS SUPPLY SIZING
The vaporization of LPG is affected by several factors: the
surface area of the container, the liquid level of propane,
temperature surrounding the container, and the relative
humidity. All of these factors are specific to a site.
Therefore, a degree of experience and judgement is
required to select the proper propane supply.
Although experience is the best guide, the following
recommendations can be used as a starting point. The
table is based on experience in northern climates where
cold weather and high humidity are prevalent in the winter.
If more or less favorable conditions prevail at a specific site,
adjustments can be made on the basis of experience.
Recommended Gas Supply
Propane Supply Tank: Heater(s)/Container(s):
500 gallon 1 heater per tank
1,000 gallon 2 heaters per tank
If more than one gas supply container is used per heater,
the containers must be manifolded together to allow vapor
withdrawal simultaneously from multiple containers. The
manifold system shall be in accordance with local codes.

1. Thread rigid end of hose into gas inlet of heater.
Tighten securely. See Fig. 2.
FIG. 2
2. Thread hose adapter to regulator outlet and tighten
securely. Connect end of hose with nut to hose
adapter. Tighten hose nut securely. See Fig. 3.
FIG. 3
HOSE AND REGULATOR ASSEMBLY
9
1. At the inlet of the regulator is a male nut and stem
called a POL. Remove the cap from the POL but do
not discard it. Insert POL stem into the valve on the
tank. Thread the nut counterclockwise into the tank
valve. Tighten the nut securely with a wrench. See
Fig. 4.
2. Slowly open the tank valve. This will prevent lock-up
of the excess flow valve within POL stem.
3. Check all connections with approved leak detector.
Do not use flame to check for leaks. A fire or
explosion may result.
4. When storing or transporting the heater, ensure the
cap is pushed back onto the POL fitting to protect the
fitting from damage and prevent entry of dirt.
FIG. 4
CONNECTING REGULATOR TO GAS SUPPLY
POL NUT
AND STEM
ADAPTER

Start-Up Instructions
The following instructions pertain to heaters with a selector
switch and thermostat.
nHeaters with thermostat only: follow steps 1,2,4,
and 5.
nHeaters without thermostat and selector switch:
follow steps 1,2, and 5.
1. Open all manual fuel supply valves. Check for gas
leaks using an approved leak detector.
2. Connect the heater to an approved electrical supply.
Selector Switch
A selector switch, located on the side panel of the
heater, allows operation in either HEAT or VENT
modes, and provides a convenient shut-off. See Fig.
5.
HEAT Mode Operation
-- Push the selector switch to HEAT
FIG. 5
4. Set the thermostat above room temperature. The
thermostat cycles the heater on and off based on
setting.
-- Fan motor starts.
-- Igniter sparks.
-- Gas valve opens.
-- Ignition occurs.
(It is normal for air to be trapped in the gas hose on
new installations. The heater may attempt more than
one trial for ignition before air is finally purged from
line and ignition takes place.)
VENT Mode Operation
-- Push the selector switch to OFF, then to VENT.
-- Only the fan motor will operate. The igniter will
not spark, nor will ignition occur.
The VENT feature is used when air circulation is
required. The heater will not cycle on its thermostat
setting. To discontinue ventilation, position the
switch to OFF or HEAT.
OFF
Position the switch to midpoint.
5. Do not exceed input rating stamped on nameplate or
manufacturer’s recommended burner orifice
pressure for size orifice(s) used. Make certain that
the primary air supply to main burner is open and
free of dusk, dirt and debris for complete, proper
combustion.
If the heater is to be shut down for cleaning, maintenance,
or repair, follow steps 1-5, where appropriate. Otherwise
turn the thermostat (if supplied) to a lower setting.
1. Close the gas supply valve.
2. Allow the heater to burn off any fuel gas remaining
in the gas supply line.
3. Set the thermostat to its lowest setting.
4. Position the selector switch to OFF.
5. Disconnect the heater from its gas and electrical
supplies.
Shut-Down Instructions
1410
Variable Rate Valve
The variable rate valve is used for adjusting the heat
output from low to high heat, or anywhere in-between.
See Fig. 6.
FIG. 6
SELECTOR
SWITCH

1. The area surrounding the heater shall be kept clear
and free from combustible materials, gasoline, and
other flammable vapors and liquids.
2. Have your gas supplier check all gas piping annually
for leaks or restrictions in gas lines.
3. 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 heater.
4. 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 heater to make sure that the regulator is reliable.
5. Check all wiring, associated terminals, and electrical
components within the heater for corrosion, frayed or
cut insulation, tight connections, etc. Repair or
replace as necessary.
6. Review all heater markings (i.e. wiring diagram,
warnings, start-up, shut-down, troubleshooting, etc.)
at the time of maintenance for legibility. Make sure
none are cut, torn, or otherwise damaged. Any
damaged markings must be replaced immediately by
contacting the L.B. White Co., Inc. Dataplates, start-
up and shut-down instructions and warnings are
available at no cost. A nominal charge will be applied
for wiring diagrams.
Maintenance Instructions
1. Before cleaning, shut off all gas supply valves and
disconnect electrical supply.
2. The heater should have dirt or dust removed
periodically:
NOTE: Before each use clean the heater using
compressed air or a soft brush or dry rag on
its case and internal components. At this
time, dust off the motor case to prevent the
motor from over-heating. Also ensure the fan
blade is free of material build-up.
WARNING
Do not use a pressure washer, water, or liquid cleaning
solution on any gas controls. Use of a pressure washer,
water, or liquid cleaning solution on the control
components can cause severe personal injury or
property damage due to water and/or liquids:
nIn electrical components, and wires causing electrical
shock or equipment failure.
nOn gas control valves causing corrosion which can
result in gas leaks and fire or explosion from the leak.
Clean all components of the heater with pressurized air,
a dry brush, or a dry cloth.
Cleaning Instructions
WARNING
Fire, Burn, and Explosion Hazard
nThis heater contains electrical and mechanical components in the gas management, and safety systems.
nSuch components may become inoperative or fail due to dust, dirt, wear and aging.
nPeriodic cleaning and inspection as well as proper maintenance are essential to avoid serious injury or property
damage.
1411

1. Remove the fan guard and the screws securing the
motor mount to the heater’s barrel. See Fig. 7.
2. Lift motor/fan assembly from heater.
FIG. 7
Motor
-- Remove both screws and strap securing the motor.
Air Proving Switch
-- Remove screw securing switch bracket to motor mount.
-- On reassembly, ensure tab on switch bracket is located in
positioning hole adjacent to screw hole.
Fan
-- Loosen set screw at hub.
-- Pull fan from shaft.
-- Ensure fan is flush on shaft end, and set screw is
positioned over flat of motor shaft before tightening
FIG. 8
Service Instructions
1. Close the fuel supply valve to the heater and
disconnect the electrical supply before servicing
unless necessary for your service procedure.
2. Remove the heater’s bottom base or side panel for
access to electrical components and connections.
3 Disconnect the appropriate electrical leads for the
component being replaced.
4. Remove the fan guard and motor/fan assembly for
access to upper barrel components.
5. The auto reset backflash, and thermostat can be
tested by disconnecting the leads at the component,
and placing a jumper connecting the leads together.
-- Reconnect the electrical supply and open fuel
supply valves.
-- If the heater lights, the component is defective
and must be replaced.
-- Do not leave the jumper on or operate the heater if
the part is defective. Replace the part immediately.
-- An alternate method for checking the components
is to perform a continuity check.
6. The air proving switch must not be jumpered. If
jumpered, the ignition control will not allow heater
operation. Test the air proving switch for continuity.
If defective, replace the switch
7. For reassembly, reverse the respective service
procedure. Ensure gas connections are tightened
securely.
8. After servicing, start the heater to ensure proper
operation and check for gas leaks.
9. Clean the heater’s orifice with compressed air or a
soft, dry rag. Do not use files, drills, broaches, etc. to
clean the orifice. Doing so may enlarge the hole,
causing combustion or ignition problems. Replace
the orifice if it cannot be cleaned properly.
WARNING
Burn Hazard
nSome heater surfaces are hot for a period of time
after the heater has been shut down.
nAllow the heater to cool before performing service,
maintenance, or cleaning.
nFailure to follow this warning will result in burns
causing injury.
WARNING
Fire and Explosion Hazard
nDo not disassemble or attempt to repair any heater
components or gas train components.
nAll component parts must be replaced if defects are
found.
nFailure to follow this warning will result in fire or
explosions, causing property damage, injury, or death.
GENERAL
MOTOR , FAN, AND AIR PROVING SWITCH
1412
REMOVE FROM BOTH SIDES
FAN END
OF HEATER SET SCREW
REMOVE
SCREWS
AIR PROVING
SWITCH

To replace the switch, remove the screws, spacers
and nuts holding the switch to the burner plate. See
Figs. 9 and 10.
FIG. 9
FIG. 10
TESTING
The switch should be tested annually.
1. Remove the switch assembly. Apply a small,soft flame
to the sensing disk of the switch. See Fig. 11. Be
careful not to melt the switch’s plastic housing when
conducting this test.
2. Within a short time, you should hear the contacts of
the switch opening.
3. Allow the switch to cool. The switch contacts will
close. Check for electrical continuity across the switch
terminals to ensure contacts have closed.
FIG. 11
AUTO RESET BACKFLASH SWITCH
1413
1. Loosen the compression nut at the outlet of the
variable rate valve. See Fig. 12.
2. Remove both screws securing the valve bracket to
the heater panel.
3. Remove the valve assembly from the heater and
replace components as needed.
FIG. 12
VARIABLE RATE VALVE AND GAS CONTROL VALVE
SCREWS
SWITCH
SCREWS
COMPRESSION
NUT
VARIABLE RATE VALVE
GAS CONTROL VALVE
NUTS AND SPACERS

1. Loosen the compression nut at the burner orifice.
Remove the bowed retaining clip. See Fig. 17.
FIG. 17
2. Reach down the barrel of the heater and pull the
orifice from the burner plate.
3. Inspect the orifice and clean any plugged holes.
Replace it if necessary. The replacement orifice will
include retaining clips.
4. Ensure the orifice is installed so the arrow on its face
is directed upward. See Fig. 18. This ensures proper
alignment of smaller orifice hole to the igniter for sure
ignition. See Fig. 19.
FIG. 18
FIG. 19
14
BURNER ORIFICE
COMPRESSION NUT
BOWED
RETAINING
CLIP
SMALLER HOLE ALIGNED TO
IGNITER GAP
MAINTENANCE
1. Using a small wire brush, reach down the barrel of
the heater and brush the igniter electrode. Ensure
buildup is removed.
2. Test the igniter. With the gas supply shut off, turn
the heater on. If there is not a spark, or a weak
spark is evident, either check the gap of the igniter
electrode or replace the igniter. Gap should be 3/16
in. See Fig. 13. If a spark jumps between the
electrodes, the igniter is functioning properly.
FIG. 13
REPLACEMENT
1. Disconnect the igniton cable from the igniter. See
Fig. 14.
2. Remove the igniter mounting screw, nut, and
washer. See Figs. 14, 15, and 16.
FIG. 14
FIG. 15
FIG. 16
IGNITER
IGNITER
CABLE
NUT
SCREW
3/16 in.
ENSURE WASHER
IS INSTALLED AT
REASSEMBLY.

1. Open the clip holding the thermostat bulb to the
motor mount.
2. Remove the knob and thermostat mounting screws.
3. Guide the thermostat bulb through the bushing.
4. Remove the thermostat from heater
FIG. 20
THERMOSTAT
IGNITION CONTROL
1415
1. Disconnect the ignition cable and remove the nuts
securing the control to the side of the heater’s base.
See Fig. 21.
2. When replacing, use care to prevent damage to the
controller’s components.
There are not any serviceable components on the
ignition control. If defective, replace the complete
control.
FIG. 21
BUSHING
NUT
SCREWS
CLIP
IGNITION CABLE
HEAT /VENT SELECTOR SWITCH
1. Removal: Firmly squeeze the retainers located at the
top and bottom of the switch while pushing against
the switch body. See Fig. 22.
2. Installing:
-- Note the UP arrows located at the top of the switch
body, directly adjacent to terminals as shown.
Wire connections:
Terminal 1:Power to motor only (VENT MODE)
Terminal 2: Incoming power to heater.
Terminal 3: Power to thermostat (HEAT MODE)
Note: Terminals 4, 5, and 6 are not used.
FIG. 22
RETAINER
RETAINER
1
3
2
4
5
6

nThe following explains a typical procedure to be
followed in checking gas pressures.
nThe gas pressures will vary depending upon fuel type.
nConsult the dataplate on the heater or page 4 in this
manual for specific pressures to be used in conjunction
with this procedure.
nGas pressure measured at the gas control valve will
verify proper inlet and burner manifold pressures.
A. Preparation
1. Obtain a pressure gauge capable of reading up to
minimum 10 PSIG.
2. Disconnect the heater from the electrical supply and
close the valve on the LP tank.
B. Gauge Installation
1. Remove the pressure tap plug on the gas regulator.
See Fig. 23.
FIG. 23
2. Install the gauge. See Fig.24. Reconnect the
electrical supply, open the fuel supply valve, and
start the heater
FIG. 24
C. Reading Pressures
1. With the heater operating, the pressure gauge must
read the pressures specified on the dataplate
2. Does the reading at the gas control valve agree with
that specified on the dataplate? If so, then no
further checking is required. Proceed to section D.
3. If the pressures do not agree with that specified on
the dataplate, then the regulator controlling gas
pressure to the heater requires adjustment or
replacment.
D. Completion
1. Once the proper pressure has been confirmed
and/or properly set, close the fuel supply to the
heater and allow the heater to burn off any gas
remaining in the gas supply line.
2. Disconnect the heater from its electrical supply.
3. Remove the gauge.
4. Install pressure tap plug and tighten securely
5. Open the fuel supply and start the heater. Check for
gas leaks at the plug Set heater’s thermostat to
desired temperature.
GAS PRESSURE CHECKS
16
PLUG

READ THIS ENTIRE SECTION BEFORE BEGINNING
TO TROUBLESHOOT PROBLEMS.
The following troubleshooting guide provides systematic
procedures for isolating equipment problems. This guide is
intended for use by a QUALIFIED GAS HEATER SERVICE
PERSON. DO NOT ATTEMPT TO SERVICE THESE HEATERS
UNLESS YOU HAVE BEEN PROPERLY TRAINED.
TEST EQUIPMENT REQUIRED
The following pieces of test equipment will be required to
troubleshoot this system with minimal time and effort.
•Digital Multimeter - for measuring AC voltage and
resistance.
•High Pressure Gauge - for checking inlet and outlet
pressures at the gas control valve against dataplate
rating.
Refer to the system operation sequence in this section to
gain an understanding as to how the equipment operates
during a call for heat. Understanding the sequence of
operation is important as it relates to problem solving.
(Note: The operation sequence represents heaters with
selector switch and thermostat)
Troubleshooting Flow Charts are provided to eliminate
problems. The flow charts identify heaters with the selector
switch and thermostat. Disregard those areas which do not
pertain to your specific heater.
To use the flow charts effectively, you must first identify the
problem.
Before beginning:
nInspect the heater for damage.
nCheck all wiring for loose connections and worn
insulation.
Problems - Heat Mode Page
Fan Motor Does Not Run, Heater Does Not Light.. . . . . . 18
Fan Motor Runs, Heater Does Not Light. . . . . . . . . . . . . . 19
Heater Lights, But Does Not Stay Lit. . . . . . . . . . . . . . . . 20
Problem - Vent Mode Page
Fan Motor Does Not Run.. . . . . . . . . . . . . . . . . . . . . . . . . 20
Components should be replaced only after each step has
been completed and replacement is suggested in the flow
chart.
Refer to the Servicing sections as necessary to obtain
information on disassembly and replacement procedures of
the component once the problem is identified by the flow
chart.
HEAT MODE-DIRECT IGNITION OPERATION SEQUENCE:
-- 115 VAC is sent to selector switch.
-- Selector switch is set to HEAT.
-- Selector switch sends 115 VAC to thermostat.
-- Thermostat calls for heat.
-- 115 VAC is sent to the the ignition control.
-- Ignition control module performs self safety check.
-- Internal components are tested.
-- Air proving circuit is checked.
-- Ignition control module begins ignition trial sequence.
-- Ignition control module sends 115 VAC to the air proving
switch.
-- Ignition control sends 115 VAC to the motor
-- Motor starts.
-- Air proving switch closes and 115 VAC is returned to the
ignition control module.
-- Ignition control module sends high voltage to the igniter
electrode.
-- Igniter sparks.
-- Ignition control module sends 115 VAC to the gas control
valve through the backflash switch.
-- Gas control valve opens.
-- Ignition occurs.
-- Igniter continues to spark until flame proving
occurs.
-- Ignition spark is cut off.
-- Gas valve stays open.
-- Room warms to desired temperature.
-- Thermostat is satisfied.
-- Heater shuts down.
-- Process starts again on a call for heat.
IGNITION FAILURE SEQUENCE:
-- Trial for ignition takes approximately 10 seconds.
-- If ignition module does not sense a flame within the ignition
trial, the module goes into safety lockout.
-- Gas valve closes.
-- Ignition spark shuts off.
-- Fan motor stops.
-- To retry for ignition, the system must be reset:
-- Turn the thermostat down and then up to call for
heat.
or
-- Unplug heater and plug it back in.
or
-- Position selector switch to off and then back to
on.
VENT MODE
-- 115 VAC is delivered to selector switch.
-- Selector switch is set to VENT.
-- 115 VAC is sent directly to the fan motor.
-- Only the fan motor operates.
17
Troubleshooting Information
WARNING
nThis heater can start at any time.
nTroubleshooting this system may require operating the
unit with voltage present and gas on. Be careful when
working on the heater.
nFailure to follow this warning may result in property
damage, personal injury or death.

Fan motor does not run, heater
does not light.
Is proper voltage
supplied to
heater?
Provide proper
voltage to heater.
Check breajer and
extension cords.
No
Is
thermostat
set above room
temperature?
Set thermostat
above room
temperature
Is proper
voltage
supplied to
thermostat?
Check power cord
and electrical supply.
Is proper
voltage supplied
to ignition
control?
Check all wiring and
connections from the
selector switch to the
ignition control. If wiring
and connections are
good, replace the
selector switch.
Does ignition
control send voltage
to motor?
Check for voltage from ignition
control to fan motor. If motor
receives voltage but does not
start, replace the motor.
If motor does not receive
voltage from the ignition
control, check all connections.
If good, replace the ignition
control.
Ensure the air proving switch
has not been by-passed.
Check continuity through the air
proving switch. If switch is
stuck closed, ensure switch
arm is not binding. Otherwise
replace the switch.
18
Problem
Yes
Yes
Yes
Yes
Yes
No
No
No
No
Does
thermostat
send voltage to
selector
switch?
Check electrical
connections from
thermostat to selector
switch. If connections
and wires are good,
replace the thermostat.
Yes
No
Is selector
switch set to
HEAT?
Set the selector switch to
HEAT.
Yes
No
Reconnect wires to capacitor.
Yes
Are capacitor wires
connected to
motor?
No
HEAT MODE
Is voltage present at
terminal PSO on the
igntion control even
if fan motor does
not start?
Check all wiring and
connections from the
ignition control to the air
proving switch. If all are
good, replace the ignition
control.
No
Yes

Fan runs, heater does not light.
Do air proving
switch contacts
close?
Open fuel supply
valves.
Check continuity
of switch.Ensure
switch arm is not
binding. Repair
or replace air
proving switch.
Ensure gas hose
is properly sized,
and is not
pinched. Provide
proper gas
pressure to heater
inlet.
Check continuity across
switch. If contacts are
open determine cause.
Check for:
proper voltage, blockages
at air inlets or outlet, loose
fan, or low fan speed.
If good, replace backflash
switch.
Are all fuel
supply valves
open?
Is proper
gas pressure
supplied?
Are the
backflash switch
contacts
closed.?
Does gas
solenoid valve open?
Is proper
voltage
supplied to
valve?
Defective wires or
connections. If good,
replace ignition control.
Defective
valve.
Does ignitor
spark?
Is high voltage
lead securely
connected to
ignition control
and ignitor?
Connect high voltage lead
Is ignitor
properly
gapped?
Check igniter gap
Regap to 3/16 in.
Is ignitor gap
positioned
toward burner
orifice?
Reposition igniter.
(See Service Instructions)
19
Problem
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes Yes
No
No
No No
No
No
NoNo
No
Determine if ignitor receives high voltage: -- SHUT OFF THE GAS SUPPLY -- Disconnect ignition lead from ignition control. -- Position a screwdriver tip about 3/16 inch away
from ignition control where lead was connected .
-- Start the heater. -- If no spark is seen, replace the igntion control. -- If spark is seen, reconnect igntion lead to control. -- Disconnect the lead at the ignitor. -- Hold the lead about 3/16 in. from a grounded
section of the heater.
-- Start the heater. -- If no spark is observed, replace the ignition lead. -- If spark is observed, replace the ignitor.
No
Ensure blades are
not damaged.
Clean the fan to
remove build-up of
material.
Is fan clean
and in good
condition?
Yes
No
Tighten the fan.
Is fan
tightened
onto motor
shaft?
No
Yes
HEAT MODE