L.B. White Tradesman 400 Dual Fuel Manual

Attention
This heater has been tested and
evaluated by the CSA Group in
accordance with the requirements
of Standard ANSI Z83.7 • CSA 2.14
and is listed and approved as a
direct gas-fired forced-air
construction heater with application
for the temporary heating of build-
ings under construction, alteration,
or repair. The heater shall NOT
be used with ductwork. CHECK
WITH YOUR LOCAL FIRE SAFETY
AUTHORITY, YOUR LOCAL FUEL
GAS SUPPLIER, OR THE
L.B. WHITE COMPANY IF YOU
HAVE QUESTIONS REGARDING
APPLICATIONS.
This Owner’s Manual provides in-
structions for Tradesman propane-
vapor, natural gas and dual fuel
heaters. Instructions pertaining to
a specific model or gas configura-
tion are noted. Unless noted, the
information applies to all versions of
Tradesman heaters.
www.lbwhite.com
SCAN THIS
with your smartphone or
visit http://goo.gl/nvneR
to view maintenance
videos for L.B.White heaters.*
WORLD PROVIDER - INNOVATIVE HEATING SOLUTIONS
411 Mason Street, Onalaska, WI, U.S.A 54650 • 800-345-7200 • 608-783-5691 • 608-783-6115 (fax) • www.lbwhite.com
Congratulations!
You have purchased the finest portable forced air construction
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].
Tradesman
Standard and Ultra
Construction Heater
Model
CP170
CP400
CP170
CP400
Btu/h/kW
170,000/49.8
400,000/117.2
155,000/45.4
400,000/117.2
Fuel
Propane Vapor
Withdrawal
Natural Gas
Dual Fuel*
Owner’s Manual and Instructions
View this manual online at www.lbwhite.com
* Requires an app like QR Droid
for Android or for iPhone
SEE ASSEMBLY
INSTRUCTIONS
INSIDE
Please refer to important
elevation information on
inside cover.
North
American
Made
!
*

Tradesman Construction Heaters
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Owner’s Manual • Tradesman
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TABLE OF CONTENTS
Heater Specifications...................................................................................................... 4
General Information........................................................................................................ 5
Safety Precautions ......................................................................................................... 6
General Installation Instructions ..................................................................................... 10
Propane Gas Supply Sizing............................................................................................ 12
Handle Assembly............................................................................................................ 13
Hose and Regulator Assembly....................................................................................... 13
Connecting Regulator to Gas Supply ............................................................................. 14
Height Adjustment (Tradesman 170).............................................................................. 14
Start-Up Instructions....................................................................................................... 15
Shut-Down Instruction .................................................................................................... 15
Gas Selector Valve......................................................................................................... 16
Variable Rate Valve ........................................................................................................ 15
Cleaning Instructions...................................................................................................... 16
Maintenance Instructions................................................................................................ 17
Service Instructions ........................................................................................................ 17
Motor, Fan, and Air Proving Switch ................................................................................ 18
Auto Reset Limit Switches.............................................................................................. 18
Igniter.............................................................................................................................. 19
Thermostat ..................................................................................................................... 20
Ignition Control ............................................................................................................... 20
Gas Pressure Checks..................................................................................................... 21
Burner Orifice LP & DF................................................................................................... 22
Troubleshooting Information........................................................................................... 23
Electrical Connection and Ladder Diagrams
Tradesman 170 Standard..................................................................................... 32
Tradesman 170 Ultra, and All Tradesman 400 ..................................................... 33
Heater Component Function .......................................................................................... 34
Parts Identification
Tradesman 170 Parts Schematic and Parts List .................................................. 35/36
Tradesman 400 Parts Schematic and Parts List .................................................. 37/38
Warranty Policy............................................................................................................... 40
Replacement Parts and Service..................................................................................... 40
WARNING
Standard products are manufactured to operate at optimum efficiency at elevations
between 0 and 2000 ft. (0-610m) above sea level.
If operated at higher elevations the product will not function correctly and may
function in an unsafe nature.
Products providing proper operation for alternate elevations may be available.
If you require a high elevation product, did not specify when ordering, and/or the
box this unit came in does not have an alternate altitude designation sticker please
contact technical support.

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WARNING
FIRE, BURN, INHALATION, AND
EXPLOSION HAZARD
■KEEP SOLID COMBUSTIBLES A SAFE
DISTANCE AWAY FROM THE HEATER.
■SOLID COMBUSTIBLES INCLUDE WOOD,
PAPER, OR PLASTIC PRODUCTS, BUILDING
MATERIALS, 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
DEATH.
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 flam-
mable vapors and liquids in the vicinity of this
or any other appliance.
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 PERSONS WHO CAN READ, UNDERSTAND, AND FOLLOW THE INSTRUCTIONS
SHOULD USE OR SERVICE THIS HEATER.
■SAVE THIS OWNER’S MANUAL FOR FUTURE USE AND REFERENCE.
■OWNER’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
■PROPER GAS SUPPLY PRESSURE MUST BE PROVIDED TO THE INLET OF THE HEATER.
■REFER TO DATA 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, OR BUILDING
DAMAGE.
■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 POISON-
ING AND THEREFORE SERIOUS INJURY OR DEATH.
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.
WARNING
Cancer and reproductive harm.
See www.P65Warnings.ca.gov.

Tradesman Construction Heaters
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Owner’s Manual • Tradesman
4
Specifications
CP170 CP400 CP400 Dual Fuel
Propane Gas Natural Gas Propane Gas Propane Gas Natural Gas
Maximum Input (Btuh/kW) 170,000/49.8 155,000/45.4 400,000 / 117.2
Minimum Input (Btuh/kW) 125,000/36.6 250,000 / 73.3 175,000 /
51.3
Inlet Gas Supply
Pressure Acceptable
at the Gas Connec-
tion of the Heater
Max 11.1 in.
W.C./2.74
kPa
13.5 in.
W.C./3.36
kPa*
5.2
PSIG/35.74
kPa
1.5 PSIG/10.34 kPa
Min 11.1 in.
W.C./2.74
kPa
7.0 in.
W.C./1.74
kPa*
5.2
PSIG/35.74
kPa
1.5 PSIG/10.34 kPa
Burner Manifold Pressure 11.0 in.
W.C./2.74
kPa
5.5 in.
W.C./1.37
kPa
5.2
PSIG/35.74
kPa
1.5 PSIG/10.34 kPa
Fuel Consumption
Per Hour Max 7.89 lbs./3.57 kg 155 ft.³/4.39 m³ 18.5 lbs. / 8.39 kg 400 ft.³ / 11.33m³
Min 5.8 lbs./2.63
kg 125 ft.³/4.39 m³ 11.6 lbs. / 5.26 kg 175 ft.³ / 4.95 m³
Motor Characteristics 1/15 H.P. / 44.7 watts 1/5 H.P. / 149 watts
3,300 RPM
Ball Bearing
Electrical Supply
(Volts/Hz/Phase) 120/60/1
Amp Draw Starting 3.7 4.0
Continuous
Operation 1.0 1.3
Dimensions Inches 24 x 10 x 16 34.5 x 12.5 x 19.5
Centime-
ters 61 x 25.4 x 40.6 87.5 x 31.7 x 49.5
Minimum Safe
Distances
From Nearest
Combustible
Materials (feet/
meters)
TOP 6 / 1.83 7 / 2.43
SIDES 3 / 0.9 5 / 1.52
BACK 3 / 0.9 5 / 1.52
BLOWER
OUTLET 10 / 3.05 15 / 4.57
GAS
SUPPLY Propane Gas Supply - 6 ft./ U.S, 10 ft./3.04 m Canada Natural Gas Supply - N/A
* The gas connection for Tradesman 170 Natural Gas heaters is the inlet of the gas
regulator supplied with the heater.

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This Owner’s Manual includes all options and acces-
sories commonly used on this heater.
When calling for technical service assistance, or for
other specific information, always have model num-
ber, configuration number and serial number avail-
able. 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.
Contact your local L.B. White distributor or the L.B.
White Company, LLC for assistance, or if you have
any questions about the use of the equipment or its
application.
The L.B. White Company, LLC has a policy of con-
tinuous product improvement. It reserves the right to
change specifications and design without notice.
General Information

Tradesman Construction Heaters
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Owner’s Manual • Tradesman
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Safety Precautions
WARNING
Air Quality Hazard
■Do not use this heater for heating human living quarters.
■Use of direct-fired heaters in the construction environment can result in exposure to levels of CO,
CO2, and NO2 considered to be hazardous to health and potentially life threatening.
■Do not use in unventilated areas.
■Know the signs of CO and CO2 poisoning
- Headaches, stinging eyes.
- Dizziness, disorientation.
- Difficulty breathing, feeling of being suffocated.
■Proper ventilation air exchange (OSHA 29 CFR 1926.57) to support combustions and maintain
acceptable air quality shall be provided in accordance with OSHA 29 CFR part 1926.154, ANSI A10.10
Safety Requirements for Temporary and Portable Space Heating Devices and Equipment used in the
Construction Industry or the Natural Gas and Propane Installation Codes CSA B149.1.
- Periodically monitor levels of CO, CO2, and NO2 existing at the construction site – at the
minimum at the start of the shift and after 4 hours.
- Provide ventilation air exchange, either natural or mechanical, as required to maintain
acceptable indoor air quality.
USA 8-Hr. Time weighted average Canada 8-Hr. Time weighted average
(OSHA 29 CFR 1926.55 App A) WorkSafe BC OHS Guidelines Part 5.1
and Ontario Workplaces Reg 833
CO 50 ppm 25 ppm
CO2 5,000 ppm 5,000 ppm
NO2 3 ppm (Reg 833)
USA – Ceiling Limit Canada STEL (15 minutes Reg 833/1 hr.
(Short Term Exposure Limit = 15 minutes) WSBC) WorkSafe BC OHS Guidelines part
5.1 and Ontario Workplaces Reg 833
CO 100 ppm
CO2 15,000 ppm (WSBC)
30,000 ppm (Reg 833)
NO2 5 ppm 1.0 ppm (WorkSafeBC)
5.0 ppm (Reg 833)
■Ensure that the flow of combustion and ventilation air exchange cannot become obstructed.
■As the building ‘tightens up” during the construction phases, ventilation may need to be increased.

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Propane gas and natural gas have man-made odor-
ants 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!
■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.
■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.
■Some people cannot smell well. Some people
cannot smell the odor of the man-made chemi-
cal added to propane or natural gas. You must
determine if you can smell the odorant in these
fuel gases.
■Learn to recognize the odor of propane gas and
natural gas. Local propane gas dealers 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.
■The odorant in propane gas and natural gas is col-
orless and the intensity of its odor can fade under
some 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 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.
Fuel Gas Odor Odor Fading - No
Odor Detected

Tradesman Construction Heaters
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Owner’s Manual • Tradesman
8
■Propane gas has 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 then do not attempt to light
heater, perform service or repairs, or make any
adjustments to the heater on the propane 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!
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 instal-
lation, 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.
c. In the Commonwealth of Massachusetts, this
product must be installed by a gas fitter licensed by
the Commonwealth of Massachusetts.
2. All installations and applications of L.B. White
heaters must meet all relevant local, state and
national codes. Included are L.P. gas, natural gas,
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.
Also refer to:
-- ANSI/NFPA 58, latest edition, Standard for
Storage and Handling of Liquefied Petroleum
Gas
-- ANSI Z223.1/NFPA 54, National Fuel Gas
Code
-- ANSI/NFPA 70, National Electrical Code.
-- CSA C22.1 Part 1, Standard Canadian Electri-
cal Code
-- CSA C22.2 No.3, Electrical Features of Fuel
Burning Equipment
3. Adequate ventilation air for combustion must be
provided.
4. We cannot anticipate every use which maybe
made of our heaters. Check with the local fire
safety authority if you have questions about
applications.
5. 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.
6. Forced air heaters shall not be directed toward any
propane gas container within 20 feet (6.10 meters).
7. 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.
8. Use only the regulator supplied with the heater.
The heater must be regulated at all times for
proper operation.
Attention - Critical
Points to Remember!

Tradesman Construction Heaters
Owner’s Manual • Tradesman
9
9. For safety, this heater is equipped with an auto
reset backflash switch, and depending on models,
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.
10. 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.
11. 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.
12. 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.
13. This heater should be inspected for proper
operation by a qualified service person before
each use and at least annually.
14. Always turn off the gas supply to the heater if the
heater is not going to be used.
15. 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.
16. 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.
17. When the heater is to be stored indoors, the
connection between the propane gas supply con-
tainer and the heater must be disconnected. The
container must be stored in accordance with the
Standard for the Storage and Handling of Liquified
Petroleum Gases, ANSI/NFPA 58, or CSA B149.,
Natural Gas and Propane Gas Installation Code.
18. Propane gas 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.
19. DO NOT attach any ducting to the heater’s hot- air
discharge, otherwise heater or property damage
may occur.

Tradesman Construction Heaters
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Owner’s Manual • Tradesman
10
heater due to wind action on the covering or
other material.
7. Insure that all accessories that ship with the
heater have been and installed.
8. Check all connections for gas leaks using ap-
proved 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.
General Installation Instructions
INSTALLATION INSTRUCTIONS
WARNING
Burn Hazard
Can cause property damage, severe injury or death.
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.
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. The heater must sit on its base and using a level,
be installed on a flat, level, 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. L.P Gas Installation Requirements
Ensure all L.P. gas containers are secured and
protected from people, vehicular traffic and
contact.
L.P. gas containers must be located on a
flat,level, and stable surface.
L.P. gas cylinders (100 lb. cylinders/tanks) must
be secured from tip-over.
Contact your local authorities, L.P. gas dealers, or
fire marshalls for specifics dealing with installation in
your area.
4. This heater is approved for indoor use only. The
heater shall be installed so it is not directly ex-
posed to water spray, rain, and /or dripping water.
5. 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.
6. Heaters used in the vicinity of combustible tar-
paulins, canvas, plastics, wind barriers, or similar
coverings shall be located at least 10 feet from
the coverings. The coverings shall be securely
fastened to prevent ignition or upsetting of the
WARNING
Fire and Explosion Hazard
■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 dam-
age, personal injury or loss of life.

Tradesman Construction Heaters
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-- 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.
9. A qualified service agency must check for proper
operating gas pressure upon installation of the
heater.
10. Always use pipe thread compound that is
resistant to propane and natural gas on threaded
connections.
11. Light according to instructions on heater or within
owner’s manual.
12. Make sure the heater has the proper gas regula-
tor for the application. A regulator must be con-
nected 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.
13. This heater is configured for use for propane gas
vapor withdrawal only. Do not use the heater
in an propane gas liquid withdrawal system or
application. If you are in doubt, contact the L.B.
White Co., Inc.
14. The heater must be installed so as not to inter-
fere with or obstruct normal exits, emergency
exits, doors and walkways.
15. Railing, fencing or suitable substitute materials
must be used to keep the heating equipment
from any people using and visiting the structure.
16. 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.
17. 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.
18. 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.
19. For indoor installation and use only.
Adequate ventilation shall be provided in
accordance with OSHA 29 CFR 1926.154,
Safety Requirements for Temporary and
Portable Space Heating Devices and Equip-
ment, ANSI A10.10, National Fuel Gas Code,
ANSI Z223.1/NFPA54, Liquified Petroleum
Gas Code, NFPA 58 or the Natural gas and
Propane Installation Code, CAN B149.1, as
appropriate.

Tradesman Construction Heaters
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Owner’s Manual • Tradesman
12
The vaporization of propane 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.
Propane Gas Supply Sizing
If more or less favorable conditions prevail at a specific
site, adjustments can be made on the basis of experi-
ence.
If more than one gas supply container is used per heater,
the containers must be manifolded together to allow va-
por withdrawal simultaneously from multiple containers.
Manifold system shall be in accordance with NFPA 58.
Tradesman 170 LP Recommended Propane Gas Supply
Average Temp ºF 50 40 30 20 10 0 -10
°C 10 4.4 -1.1 -6.7 -12.2 -17.8 -23
Number of 100lb.(45kg) 1 1 1 2 2 2 3
Gas Cylinders to
Use Per Heater
* When multiple LP gas supply containers are used, the containers must be manifolded together together to
allow simultaneous vapor withdrawal from all cylinders.
Tradesman 400 Recommended Gas Supply
Propane Supply Tank: Heater(s)/Container(s):
500 gallon/ 1,893 litres 1 heater per tank
1,000 gallon/3,785litres 2 heaters per tank

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Owner’s Manual • Tradesman
13
Assemble handle to four holes at barrel top as shown in
Fig. 1. Tighten screws securely.
FIG. 1
Hose and Regulator
Assembly
-- Use pipe thread compound at areas as shown and
ensure all connections are tightened securely.
TRADESMAN 170 Propane Gas
(See Fig. 2 and 3)
FIG. 2
FIG. 3
Handle Assembly
THREAD SWIVEL NUT
END OF HOSE TO
HOSE THREADS ON
ADAPTER
THREAD HOSE ADAPTER TO
INLET OF GAS CONTROL VALVE
APPLY COMPOUND
AT 3/8 INCH THREADS
OF HOSE ADAPTER
APPLY COMPOUND AND THREAD RIGID HOSE
END INTO REGULATOR OUTLET.
-- Apply pipe thread compound at all threaded
connections.
-- Observe gas flow direction of regulator.
TRADESMAN 170 NATURAL GAS
-- Apply pipe thread compound at threaded connections
and connect the components together. See Fig. 4 and
tighten securely.
FIG. 4
TRADESMAN 400 LP (See Fig. 5 and 6)
FIG. 5
FIG. 6
APPLY COMPOUND AND THREAD RIGID
HOSE END INTO GAS INLET AT HEATER
APPLY COMPOUND AT 1/4 INCH
THREADS OF HOSE ADAPTER AND
THREAD INTO REGULATOR OUTLETS
THREAD SWIVEL NUT
END OF HOSE TO HOSE
THREADS ON ADAPTER

Tradesman Construction Heaters
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Owner’s Manual • Tradesman
14
TRADESMAN 400 DUAL FUEL
When using propane as the fuel:
1. Assemble the components as shown in Fig. 7.
2. Tighten all components securely
FIG. 7
When using natural gas as the fuel
Do not use the POL fitting.
1. Ensure the natural gas supply has line pressure of minimum
2 PSIG up to a maximum of 20 PSIG.
2. Connect the hose to the regulator’s outlet and at the heater’s
gas inlet.
3. Connect the regulator to the natural gas supply using the
appropriate fittings.
4. Tighten all connections securely.
POL FITTING
HOSE ADAPTER
BUSHING, 3/4 IN.
BUSHING, 1 IN.
Connecting Propane Regu-
lator to Propane Gas Supply
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 propane
fuel container. Thread the nut counterclockwise into the
container’s valve. Tighten the nut securely with a wrench.
See Fig. 7.
2. Slowly open the tank or cylinder 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.
WARNING
Burn Hazard
■Do not adjust height while heater is operating
or hot.
■Adjust height only after the heater has been
disconnected from its power supply and cool
to touch.
■Failure to follow this warning will result in burns
causing injury.
FIG. 8
Height Adjustment
Tradesman 170
Tradesman 170 heaters include a height adjustment
feature, allowing the user to change the elevation of the
heater for greater heat direction. See Fig. 9 for location of
adjustment on front base of heater.
To adjust the heater’s discharge outlet height:
-- Loosen knob
-- Lift heater slightly at blower outlet end
-- Pull leg to desired setting
-- Tighten knob.
FIG. 9
POL NUT
AND STEM
KNOB
LEG

Tradesman Construction Heaters
Owner’s Manual • Tradesman
15
Cleaning Instructions
Shut-Down Instructions
If the heater is to be shut down for cleaning,
maintenance, or repair, follow steps 1-4. Otherwise
turn the thermostat 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. Disconnect the heater from its gas and electrical
supplies.
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 com-
ponents. 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
Fire, Burn and Explosion Hazard
■This heater contains electrical and mechanical compo-
nents in the gas management, and safety systems.
■Such components may become inoperative or fail due
to dust, dirt, wear and aging.
■Periodic cleaning and inspection as well as proper
maintenance are essential to avoid serious injury or
property damage.
Start-Up Instructions
1. Connect the heater’s electrical cord to an
approved electrical outlet.
2. Open the gas supply valve. For LP heaters, this is
located on the tank or cylinder.
3. Tradesman 400 Dual Fuel: Set the fuel selector valve
to correct position. See Fig. 10
4. Set thermostat on heater to a setting above room
temperature. The heater will start and the burner
will ignite.
5. Position the variable rate valve to desired heat. See
Fig. 11.
■It is normal for air to be trapped in gas hose on new
installations. You may need to recycle the heater
before air is finally purged from the line and ignition
takes place.
■Do not exceed input rating provided on dataplate or
manufacturer’s recommended burner manifold pre-
ssure for size orifice used. Ensure that the primary
air supply to heater is open and free of dust, dirt and
debris for complete proper combustion
Variable Rate Valve
All heaters includes a variable rate valve for adjusting the
heat output from low to high heat, or anywhere
in-between. See Fig. 11.
FIG. 11
Selector Valve
(Tradesman 400 Dual Fuel)
This heater is shipped from the factory with the fuel selec-
tor valve in the propane gas (LP) position. Ensure the fuel
selector valve’s handle is properly positioned for the fuel
being used.
FIG. 10

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Owner’s Manual • Tradesman
16
WARNING
Do not use a pressure washer, water, or liquid clean-
ing 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:
■In electrical components, and wires causing electrical
shock or equipment failure.
■On 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.
Maintenance Instructions
Service Instructions
BEFORE EACH USE:
■Check the area surrounding the heater to ensure it is
clear and free of combustible materials, gasoline, and
other flammable vapors and liquids.
■Have your gas supplier check all gas connections for
leaks or restrictions in gas lines.
■Inspect the regulator vent to make sure the regulator
vent is not blocked. Debris, insects, insect nests, snow,
or ice on a regulator can block vents and cause excess
pressure at the heater.
■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.
■Check the hose assembly after heater installation, reloca-
tion, 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 immediately.
■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. Data plate, startup and shut-down instructions and
warnings are available at no cost.
ANNUALLY:
■Clean and check the igniter for cracks. Replace if neces-
sary.
■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.
■Test the auto reset high limit switches to ensure proper
operation. (See Testing instructions for same in this
owner’s manual.)
1. Close the fuel supply valve to the heater and discon-
nect 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 high limit switches, 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
WARNING
Burn Hazard
■Some heater surfaces are hot for a period of
time after the heater has been shut down.
■Allow the heater to cool before performing
service, maintenance, or cleaning.
■Failure to follow this warning will result in
burns causing injury.
WARNING
Fire and Explosion Hazard
■Do not disassemble or attempt to repair any
heater components or gas train components.
■All component parts must be replaced if
defects are found.
■Failure to follow this warning will result in
fire or explosions, causing property damage,
injury, or death.

Tradesman Construction Heaters
Owner’s Manual • Tradesman
17
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.
Motor, Fan, and Air
Proving Switch
1. Remove fan guard and screws securing the motor
mount to the heater’s barrel. See Fig 12.
2. Lift motor/fan assembly from heater.
FIG. 12
Motor
-- Remove both screws and strap securing the motor.
-- Position the motor between motor mount stops
when reinstalling.
Air Proving Switch (See Fig. 13)
(Not provided on Tradesman 170 standard heater)
-- Remove screw securing switch bracket to motor
mount.
-- On reassembly, ensure tab on switch bracket is
located in hole.
NOTE: The air proving switch contacts must be open
prior to motor start-up. If the switch contacts
do not close after the motor starts, or are
closed prior to motor starting, the igniter will
not spark nor will the gas control valve open.
REMOVE
REMOVE
(BOTH SIDES)
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 tighten-
ing.
FIG. 13
Auto Reset High Limit
Switches
The auto reset high limit switch is designed to cut off
power to the gas control valve if the heater should
overheat due to blockage at the air inlet or discharge
outlet.
Depending on heater model, there can be one or
two high limit heat switches. All Tradesman 170
and Tradesman 400 Dual Fuel heaters
have two limits. Tradesman 400LP
heaters have only one limit switch.
Regardless of model, ensure any mounting hardware
(screws, spacers, or washers) is installed when
replacing or testing the switch.
Locations of the limits are:
Tradesman 170 and Tradesman 400 Dual
Fuel:
■One on the burner plate and one on the underside
of the combustion chamber. See Figs. 14 and 15.
■The switch on the underside of the combustion
chamber is accessed by removing the base bottom
of the heater.
Tradesman 170 only:
- The combustion chamber is stamped with the let-
ters P (Propane) or N (Natural Gas) adjacent to the
screw holes to identify location for the appropriate
gas being used.
FAN HUB FLUSH WITH SHAFT END
SET SCREW
REMOVE
SCREWS AIR PROVING
SWITCH
TAB IN HOLE
STRAP

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Owner’s Manual • Tradesman
18
FIG. 14
FIG. 15
■Tradesman 400: Limit switch located on burner
plate. See Fig. 16.
FIG. 16
TESTING
The switches should be tested annually.
1. Remove the appropriate switch. Apply a small,soft
flame to the sensing disk of the switch. 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. Check for continuity across
terminals to ensure the switch has opened.
3. Allow the switch to cool. The switch contacts will
close. Check for electrical continuity across the switch
terminals to ensure contacts have closed.
Igniter
■Regardless of model, disconnect the ignition cable from
the ignitor. See Fig. 17, Tradesman 170 shown.
a. Tradesman 170 heaters:
-- Remove the screw from the ignitor bracket. See Fig.
17.
b. Tradesman 400 heaters:
-- Remove the igniter mounting screw, nut, and washer.
See Fig. 18.
FIG. 17
FIG. 18
1 EACH SPACER AND
NUT PER MOUNTING
SCREW
HEIGHT ADJUSTMENT LEG
TRADESMAN 170
P
N
1 EACH
SPACER AND
NUT, AND 3
WASHERS PER
MOUNTING
SCREW
MOUNTING
SCREW
IGNITION
CABLE
WASHER MUST BE LOCATED
BETWEEN IGNITER AND
BURNER PLATE
MOUNTING
SCREW, NUT,
AND WASHER

Tradesman Construction Heaters
Owner’s Manual • Tradesman
19
MAINTENANCE
1. Using a small wire brush, reach down the barrel of
the heater and brush the igniter electrode. Ensure
buildup is removed.
2. Verify igniter gap of the igniter electrode. Gap
should be 3/16 in. See Fig. 19.
FIG. 19
Thermostat
Tradesman 170:
■Remove the base bottom. Slide the thermostat
bulb through the cable tie. See Fig. 20.
All Tradesman 400 Heaters:
■Remove a side panel and the fan guard. Open the
bulb rention clip to remove thermostat bulb. See
Fig. 21. Guide the thermostat bulb through the
bushing.
2. Remove knob and thermostat mounting screws
and disconnect its wiring. See Fig. 22.
FIG. 20
FIG. 21
FIG. 22
Ignition Control
1. Disconnect the LED wire harness (if applicable) from
the circuit board.
2. Disconnect the ignition cable and remove the nuts
securing the control to the side of the heater’s base.
See Fig. 23.
3. When replacing, use care to prevent damage to the
controller’s components.
FIG. 23
CLIP
BUSHING
SCREWS
SCREWS
IGNITION CABLE NUT
LED WIRE
HARNESS
3/16 IN. / 4.7 mm
BULB
THERMOSTAT

Tradesman Construction Heaters
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Owner’s Manual • Tradesman
20
Gas Pressure Checks
The following explains a typical procedure to be followed
in checking gas pressures. The gas pressures will vary
depending upon fuel type.
Consult the dataplate on the heater or page 4 in this
manual for specific pressures to be used in conjunction
with this procedure. Gas pressure measured at the gas
control valve will verify proper inlet and burner manifold
pressures.
A. Preparation
Tradesman 170 heaters:
■Obtain a pressure gauge capable of reading up to
35 in. W.C.
Tradesman 400 heaters:
■Obtain a pressure gauge capable of reading up to
10 PSIG.
1. Disconnect the heater from the electrical supply and
close the fuel supply valve to the heater inlet.
2. Remove case panels or base as necessary for access
to the gas control valve.
3. Brush or blow off any dust and dirt on or in the vicinity
of the gas control valve.
B. Gauge Installation
■Using a 3/16 in. allen wrench, remove the pressure tap
plug on the gas control valve and install the appropri-
ate gauge. See Figs. 24, 25, as shown. (Ensure gauge
tube is not pinched).
TRADESMAN 170 SHOWN
FIG. 24
TRADESMAN 400
FIG. 25
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 or adjustment is required. Proceed to section
D.
3. If the inlet pressures do not agree with that specified
on the dataplate, then the regulator controlling gas
pressure to the heater requires adjustment.
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.
PLUG