L.B. White Tradesman CP100 Manual

MODELS OUTPUT (Btuh) FUEL
CP100 100,000 Propane Vapor
Withdrawal
Congratulations!
You have purchased the finest 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 1-800-345-7200.
Owner's Manual and Instructions
Tradesman® Construction Heater
ATTENTION ALL USERS
This heater has been tested and evaluated by CSA International in accordance with
Standard ANSI Z83.7zCSA 2.14 and is listed and approved as a direct gas-fired
forced-air construction heater for the heating of buildings under construction,
alteration or repair. If you are considering using this product for any application
other than its intended use, then please contact your fuel gas supplier, or the
L.B. White Co., Inc.
150-21834-A
Certification by:

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

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. The dataplate is
located on the side panel of the heater.
This manual will instruct you in the operation and care of
your unit. Completely review this manual so that you fully
understand the heater and how it functions.
The 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.
SECTION PAGE
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Heater Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Set-Up Instructions
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Carrying Handle Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Hose and Regulator Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Start-Up Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Shut-Down Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Variable Heat Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Cleaning Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Maintenance Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Service Instructions
Motor and Fan Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Thermocouple . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Burner Orifice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Igniter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Backflash Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Gas Control Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Testing the Backflash Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Electrical Connection and Ladder Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .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
3

SPECIFICATIONS
Maximum Input (BTUH) 100,000
Minimum Input (BTUH) 50,000
350 CFM
1/15 H.P.
3200 RPM
4.7
2
25 1/4 x 9 3/4 x 14
TOP 6 ft.
SIDES 2 ft.
BACK 2 ft.
BLOWER
OUTLET
GAS
SUPPLY
-20º F.
22
28
CP100
Propane
Gas
MMooddeell
Ventilation Air Required
to Support Combustion
Fuel Type
Net Weight (lbs.)
Shipping Weight (lbs.)
Electrical Supply
(Volts/Hz/Phase)
Amp Draw
Dimensions (Inches)
L x W x H
Minimum Safe Distances From
Nearest Combustible Materials
Minimum Ambient Temperature
In Which Heater May Be Operated
STARTING
CONTINUOUS
OPERATION
Motor Characteristics
Fuel Consumption Per Hour
Inlet Gas Supply
Pressure Acceptable
at the Inlet of the
Heater for Purpose
of Input Adjustment
MAX.
MIN.
MAX.
MIN.
11 in. W.C.
11 in. W.C.
4.63 lbs.
2.32 lbs.
Ball Bearing
6 ft.
6 ft.
(1.83m)
115/60/1
Heater Specifications
4

Propane ggas aand nnatural ggas hhave mman-mmade oodorants aadded sspecifically ffor ddetection oofffuel ggas lleaks.
If aaggas lleak ooccurs, yyou sshould bbeaable ttossmell tthe ffuel ggas.
THAT’S YYOUR SSIGNAL TTOGGOIINTO IIMMEDIATE AACTION!
■Do not take any action that could ignite the fuel gas. Do
not operate any electrical switches. Do not pull any
power supply or extension cords. Do not light matches
or any other source of flame. Do not use your
telephone.
■Get everyone out of the building and away from the area
immediately.
■Close all propane gas tank or cylinder fuel supply
valves.
■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.
WARNING
■Do not use this heater for heating human living
quarters.
■Do not use in unventilated areas.
■The flow of combustion and ventilation air must not be
obstructed.
■Proper ventilation air must be provided to support the
combustion air requirements of the heater being used.
■Refer to the specification section of the heater’s
Owner’s Manual, heater dataplate, or contact the L.B.
White Company to determine combustion air ventilation
requirements of the heater.
■Lack of proper ventilation air will lead to improper
combustion.
■Improper combustion can lead to carbon monoxide
poisoning leading to serious injury or death. Symptoms
of carbon monoxide poisoning can include headaches,
dizziness and difficulty in breathing.
Asphyxiation HHazard
■Some ppeople ccannot ssmell wwell. SSome ppeople ccannot
smell tthe oodor ooftthe mman-mmade cchemical aadded tto
propane. YYou mmust ddetermine iifyyou ccan ssmell tthe
odorant iintthese ffuel ggases.
■Learn to recognize the odor of propane 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 oodorant iinppropane ggas iisccolorless aand tthe
intensity oofiits oodor ccan ffade uunder ssome
circumstances.
■If there is an underground leak, the movement of gas
through the soil can filter the odorant.
■Propane gas odor may differ in intensity at different
levels. Since propane gas is heavier than air, there may
be more odor at lower levels.
■Always bbessensitive ttotthe sslightest ggas oodor. If you
continue to detect any gas odor, no matter how small,
treat it as a serious leak. Immediately go into action as
discussed previously.
Safety Precautions
FUEL GAS ODOR
ODOR FADING -- NO ODOR DETECTED
ATTENTION -- CRITICAL POINTS TO REMEMBER!
■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 fueled heaters, then do not attempt to
light heater, perform service or repairs, or make any
adjustments to the heater on propane gas.
■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.
■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!
5

1. Do not attempt to install, repair, or service this heater
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.
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 propane 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 and/or
-- ANSI Z223.1/NFPA 54, National Fuel Gas
Code
-- ANSI/NFPA 70, National Electrical Code.
3. We cannot anticipate every use which may be made
of our heaters. Check with your local fire safety
authority if you have questions about applications.
4. Other standards govern the use of fuel gases and
heat producing products in specific applications.
Your local authority can advise you about these.
5. Do not move, handle, or perform maintenance on the
heater while in operation or connected to a power or
fuel supply.
6. For safety, this heater is equipped with a backflash
switch. Never operate this heater with any safety
device that has been bypassed. Do not operate this
heater unless all of these features are fully
functioning.
7. Do not operate the heater with its cover or panels
removed.
8. Do not locate fuel gas containers or fuel
supply hoses anywhere near the blower outlet of the
heater.
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 blower outlet of the heater shall not be directed
towards any propane gas container within 20 ft. (6.10
meters) of the heater.
11. The gas supply system must be arranged to provide
for vapor withdrawal from the operating cylinder. For
continuous operation, the minimum gas cylinder size
should be a 100 pound cylinder or larger.
Vaporization of LP gas occurs at a slower rate as the
temperature falls. Therefore, it may be necessary to
manifold more than one cylinder together to provide a
consistent fuel supply for the heater. When using a
manifolded cylinder supply system inside a building,
the total number of cylinders manifolded
together shall not be greater than three 100 pound
cylinders.
12. The hose assembly shall be visually inspected on an
annual basis. 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 animals,
building materials, and contact with hot surfaces
during use. The hose assembly shall be that
specified by the manufacturer. See parts list.
13. Check for gas leaks and proper function upon heater
installation or after relocation.
14. This heater should be inspected for proper operation
before each use and at least annually by a qualified
service person.
15. Always turn off the gas supply to the heater if it is not
going to be immediately used in the heating of the
construction area.
16. 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.
17. When the heater is to be stored indoors, the
connection between the propane gas cylinder(s) and
the heater must be disconnected, the cylinders
moved from the heater and stored in accordance with
the standard for the storage and handling of liquified
petroleum gases, ANSI/NFPA 58. 6

1. Read all safety precautions and follow L.B. White
recommendations when using this heater. If during
the set-up or relocating of heater, you suspect that a
part is damaged or defective, call a qualified service
agency for repair or replacement.
2. Make sure the heater is properly positioned before
use. Observe and obey all minimum safe distances
of the heater to the nearest combustible materials.
Minimum safe distances are given on the heater
nameplate and on page 4 of this manual.
3. This heater is approved for indoor use only.
4. The heater is not for use with ductwork.
5. Heaters used in the vicinity of combustible tarpaulins,
canvas, plastic 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 heater due to wind action
on the covering or other material.
6. 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. Further
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. Further 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.
7. Light according to instructions on heater or within
owner's manual.
8. This heater is provided with a pre-set single-stage
regulator and a gas hose, as specified by L.B. White
Co., of proper length, diameter, and construction.
Make sure these critical components are installed to
allow proper operation.
9. 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
individual heater. Contact your fuel gas supplier if you
have any questions.
10. 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.
11. The heater must be installed so as not to interfere
with or obstruct normal exits, emergency exits, door,
and walkways.
12. As necessary, non-combustible railing, fencing, or
other suitable materials may be used surrounding the
heater to create a safe work environment for people
working in the structure and to maintain proper
clearances from combustible materials.
13. Locate the heater to protect it from tipover or
accidental movement.
14. The heater must be located on a flat, stable, and
horizontal surface.
15. The heater must be located so that it is not directly
exposed to water spray, rain, or dripping water.
16. When using the heater, insure that proper voltage is
supplied to the heater.
WARNING
Fire ooreexplosion hhazard.
Can ccause pproperty ddamage, ssevere iinjury oorddeath.
1. To avoid dangerous accumulation of fuel gas, turn off
gas supply at the heater’s service valve before
starting installation, and perform gas leak test after
completion of installation.
2. Do not force the safety control button. Use only
normal hand pressure to depress the safety control
button. Never use any tools. If the button will not
operate by hand, the control should be replaced by a
qualified service technician. Force or attempted
repair may result in fire or explosion.
Set-Up Instructions
GENERAL
WARNING
Fire aand EExplosion HHazard
■Do not use open flame (matches, torches, candles,
etc.) in checking for gas leaks.
■Use only approved leak detectors.
■Failure to follow this warning can lead to fires or
explosions.
■Fires or explosions can lead to property damage,
personal injury or loss of life.
7

1. Always use approved pipe thread compound suitable
for use with propane gas on the threaded
connections.
2. Assemble the components together according to the
figure. This view is to show general assembly of the
components only. The regulator must always be
installed so its vent is always pointed downward when
attached to the propane gas supply.
3. Tighten all connections securely.
4. Check aall cconnections ffor ggas lleaks uusing aapproved
gas lleak ddetectors.
HOSE AND REGULATOR ASSEMBLY
FIG. 2
1. Fasten the carrying handle to the heater case top
using the four (4) sheet metal screws provided.
2. The handle may also be fastened to the side of the
case top for stacking purposes during storage.
FIG. 1
CARRYING HANDLE ASSEMBLY
CAUTION
■Do not stack the heaters more than two high during
storage.
■Tip-over may occur, causing personal injury or damage
to the heater.
ALTERNATE
HANDLE LOCATION
HANDLE
SCREW
8

Follow steps 1 - 5 on initial start-up. For normal start-up,
follow steps 2 and 3.
1. Open all manual fuel supply valves and check for gas
leaks using approved leak detectors.
2. Connect the heater’s electrical cord to an approved
electrical supply. The fan motor will start and the
igniter will spark.
3. Fully depress the button on the safety control valve.
The burner will light. Keep the button depressed for
about 30 seconds or until the thermocouple has
warmed up. Release the button. The burner will stay
lit.
4. Turn the adjustment valve on the heater to either
high or low heat positions as desired.
5. Do not exceed the input rating stamped on the
dataplate of the heater. Do not use an orifice size
different than specified for the input rating of this
heater, fuel type configuration and altitude.
FIG. 3
■If the heater is to be shut down after normal use, for
example when the desired temperature is achieved, and
further use is anticipated, position the on/off switch to
the off position.
■If the heater will not be used again until later, position
the on/off switch to off and close all fuel supply valves
to the heater.
■If the heater is to be cleaned, or have any service or
maintenance performed on it:
-- Close all fuel supply valves to the heater.
-- Allow the heater to burn off any remaining fuel in its
gas supply hose.
-- Disconnect the heater from its electrical and fuel
supplies.
Start-Up Instructions
Shut-Down Instructions
CONTROL BUTTON
9

HEAT ADJUSTMENT VALVE
MAXIMUM
HEAT
MINIMUM
HEAT
FIG. 4 FIG. 5
1. This heater has a heat adjustment valve for varying
heat output located on the side of the heater. THIS IS
NOT A MANUAL GAS SHUT OFF VALVE.
2. The valve can be adjusted to deliver either minimum
heat or maximum heat. When the valve handle is
parallel to the gas flow, the valve is completely open
to deliver maximum heat output. (Refer to Fig. 4.)
The throttle valve may be adjusted to minimum heat
output by turning the handle 90° to gas flow or any
position between maximum and minimum settings.
(Refer to Fig. 5.).
Variable Heat Output
10

1. Check the heater’s gas hose after each use for cuts,
cracks, and worn fittings. Replace the hose assembly
if it is suspect. Do not attempt to repair the gas hose.
2. The aappliance aarea sshall bbekkept cclear aand ffree ffrom
combustible mmaterials, ggasoline, aand oother
flammable vvapors aand lliquids.
3. Review all heater markings prior to use. Markings
constitute information relating to warnings start-up,
shut down, etc. Make sure the markings are legible
and not cut, torn, covered with plaster, or otherwise
damaged. Any damaged markings should be
replaced immediately. Markings are available at no
cost by contacting the L.B. White Co.
4. Regulators must be inspected before each use to
make sure the regulator vent is not blocked. Dirt,
mud, snow, ice, tar, etc. can block the vent and cause
excess pressure at the heater. Any regulator that is
suspected of having been submerged in water must
be replaced.
1. Before cleaning, shut off all gas supply valves and
disconnect electrical supply.
2. Review the overall condition of the heater before each
use to determine if a general cleaning is necessary:
a. Use compressed air or a soft brush to clean
interior and exterior surfaces and component
parts of dust and dirt.
b. Observe and obey the Warning within these
cleaning instructions.
WARNING
This heater must not be washed. Use of a pressure
washer, water or liquid cleaning solution on this heater
can cause severe personal injury or property damage
due to water and/or cleaning solution:
1. In electrical components, connections and wires
causing electrical shock or component failure.
2. On gas control components causing corrosion which
can result in gas leaks and fire or explosion from
the leak.
The heater must be cleaned in accordance with the
manufacturer’s instructions without being subjected to
liquid spray or wetting.
Cleaning Instructions
Maintenance Instructions
WARNING
Fire, BBurn, aand EExplosion HHazard
■This heater contains electrical and mechanical components in the gas management, safety and airflow systems.
■Such components may become inoperative or fail due to dust, dirt, wear, or aging.
■Periodic cleaning and inspection as well as proper maintenance are essential to avoid serious injury or property
damage.
11

MOTOR
BOLT
FAN
NUT
MOUNT
9 1. Disconnect the heater from its electrical supply.
2. Close all fuel supply valves to the inlet of the heater.
3. Remove the case top and either side panel.
4. Disconnect the motor leads.
5. Loosen the set screw on the fan hub and slide the fan
off of the fan shaft. Be careful to prevent fan blade
damage.
6. Remove the nut and bolt that secure the motor to the
motor mount.
7. Install the replacement motor and fan by reversing
these procedures.
ATTENTION
■Insure that set screw of fan hub is over flat of motor
shaft before tightening.
■Fan must be installed so set screw is toward motor and
fan hub is flush with motor shaft end.
■Spin the fan blade to make sure the fan blade does not
contact any internal heater components.
FIG. 6
Service Instructions
MOTOR AND FAN ASSEMBLY
THERMOCOUPLE
CAUTION
Allow the heater to cool before servicing.
BURNER PLATE
THERMOCOUPLE
CLIP
1/2 INCH
1. Disconnect the heater from its electrical supply and
close all fuel supply valves to the heater.
2. Remove the case top and the right side panel as
viewed from the air inlet end of the heater.
3. Using the appropriate wrench, disconnect the
thermocouple contact nut from the pilot safety control
valve.
4. Disconnect the two electrical leads from the energy
cut off block on the thermocouple.
5. Pull the thermocouple tip from its retaining sleeve.
6. Install the replacement thermocouple by reversing
the above procedures.
ATTENTION
■When properly installed, the tip of the thermocouple will
extend 1/2 in. from the retaining collar on the
combustion side of the burner plate.
■When tightening the contact nut of the thermocouple,
thread the nut in fingertight and snug it in place with
the appropriate wrench.
FIG. 7
12

BURNER ORIFICE
CAUTION
Allow the heater to cool before servicing.
1. Disconnect the heater from its electrical supply and
close all fuel supply valves to inlet of the heater.
2. Remove the case top from the heater and the right
side panel (when viewed from air inlet end of heater).
3. Disconnect the electrical lead from the igniter.
4. Remove the screw that secures the igniter to the
burner plate. Pull the igniter from the burner plate.
5. Install the new igniter by reversing the above
procedures.
IMPORTANT
The tip of igniter electrode should be 1/8 in. gap from the
burner plate when the igniter is installed.
6. Reinstall the case top and side panel.
7. Reconnect the heater to its electrical supply.
8. Start the heater and check for proper operation.
FIG. 9
IGNITER
CAUTION
Allow the heater to cool before servicing.
RING, FLAT
ORIFICE
BURNER PLATE
RING, BOWED
MANIFOLD
IGNITER
BURNER PLATE 1/8
1. Disconnect the heater from its electrical supply and
close all fuel supply valves to the inlet of the heater.
2. Remove the case top from the heater.
3. Loosen the compression nut at the orifice inlet using
the appropriate wrench.
4. Remove the bowed retaining ring nearest the
compression nut.
5. Reaching down the heater barrel, pull the orifice from
the burner plate.
6. The replacement orifice ships with two (2) retaining
rings. Attach the flat ring to the orifice as shown in
Fig. 8. Reaching down the barrel, position the orifice
into the burner plate. Secure the orifice into position
using the bowed retaining clip.
7. Thread the compression nut onto the orifice and
tighten securely.
8. Reconnect the heater to its electrical supply and open
the fuel supply valves to the heater.
9. Start the heater and check for proper operation.
Leak check the compression sleeve and orifice
connection.
10. Shut the heater off and reinstall the top cover.
FIG. 8
13

BACKFLASH SWITCH
WARNING
Fire aand EExplosion HHazard
■Do not disassemble the safety control valve.
■Do not attempt to replace any component of the safety
control valve.
■The safety control valve must be replaced if any
physical damage occurs to the valve.
■Failure to follow this warning will result in fire or
explosion, leading to sever injury, death, or property
damage.
HEAT CHAMBER
BURNER PLATE
BACKFLASH SWITCH
SCREW
1/4
1. Disconnect the heater from its electrical supply and
close all fuel supply valves to the inlet of the heater.
2. Remove the case top from the heater.
3. Disconnect the electrical leads from the backflash
switch. Remove the mounting screw from the
switch’s support bracket.
4. The replacement switch ships attached to its
mounting bracket. Mount the replacement switch
and reconnect the electrical leads to the switch.
5. Spacing gap of switch to burner plate should be 1/4
inch. Adjust as necessary.
6. Reinstall the case top.
7. Reconnect the heater to its electrical supply and open
all fuel supply valves to the heater.
8. Start the heater and check for proper operation.
FIG. 10
CAP
SAFETY CONTROL VALVE
LOW PRESSURE GAUGE
5
0
10
15
20
25
30
35
GAS CONTROL VALVE
1. Disconnect the heater from its electrical supply and
close all fuel supply valves to the heater.
2. Remove either case side panel.
3. Remove the cap on the underside of the control valve.
4. Connect a pressure gauge at this point, capable of
reading up to 35 in. W.C. (L.B. White gauge part
number 00764.)
5. Reconnect the heater to its electrical supply and open
the fuel supply valves to the heater.
6. Light the heater.
7. When the burner lights, the flowing gas pressure
must be 11 in. W.C. If it is not, either of the following
conditions exist:
a. Gas control inlet screen is plugged with debris.
Clean out the screen with compressed air or
replace if necessary.
b. Single stage regulator is out of adjustment.
Replace the regulator.
8. After checking, remove gas gauge. Reinstall cap
(tighten securely). Reconnect the heater to electrical
supply, and open the fuel supply valves to the heater.
FIG. 11
14

The backflash switch is an auto reset temperature switch.
The switch should be tested at least once a year, preferably
when the heater is given a thorough cleaning.
1. Remove the switch with bracket from the heater.
2. Holding the switch by its mounting bracket, apply a
soft flame only to the sensing portion on the backside
of the switch. Be careful not to melt the switch
housing when testing.
3. Within thirty seconds you should here a pop coming
from the switch, indicating that the electrical contacts
have opened. Check the switch contacts for
continuity to verify the circuit has opened.
4. Allow the switch to cool down. The switch will reset
itself in about one minute. Check for continuity
across the terminal to verify contact closure.
FIG. 12
TESTING THE BACKFLASH SWITCH
FLAME
SENSING SURFACE
BACKFLASH SWITCH
15

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 NNOT AATTEMPT TTOSSERVICE TTHESE HHEATERS
UNLESS YYOU HHAVE BBEEN PPROPERLY TTRAINED.
TEST EEQUIPMENT RREQUIRED
The following pieces of test equipment will be required to
troubleshoot this system with minimal time and effort.
• Digital MMultimeter - for measuring AC and DC voltage and
resistance.
• Low PPressure GGauge - for checking inlet and manifold
pressures at the gas control valve against dataplate
rating.
■Visually inspect equipment for apparent damage.
■Check all hoses for abrasion and wear. Replace any
that are suspect.
■Make sure heater is properly installed and meets
minimum clearances to nearest combustible
materials. (Refer to dataplate on heater.)
■Check all wiring for loose connections and worn
insulation.
To effectively use these flow charts, you must first identify
the problem. The problems are numbered sequentially,
along with a brief explanation of each problem. Start at the
diamond closest to the identified problem and proceed with
each step, performing whatever tests are suggested. After
each step or test, the guide will direct the service person to
the next logical step based on the outcome of the previous
check.
Components should be replaced only after each step has
been completed and replacement is suggested in the flow
chart.
The problems are listed below along with the page number
on which you may find the flow chart for the specific
problem.
Problem Description Page
1. Fan Motor Does Not Run . . . . . . . . . . . . . . . . . . . . . . . .18
2. Fan Motor Runs, Heater Does Not Light . . . . . . . . . . . .18
3. Heater Lights But Does Not Stay Lit . . . . . . . . . . . . . . .19
4. Burner Flame Drops Out After 10-15 Minutes
Of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
5. Backflash Switch is “Open” . . . . . . . . . . . . . . . . . . . . . .20
Troubleshooting Guide
WARNING
Electrical SShock aand BBurn HHazard
■Troubleshooting this system may require operating the
unit with line voltage present and gas on. Use extreme
caution when working on the heater.
■Failure to follow this warning may result in property
damage, personal injury or death.
16

Problem 11
Fan MMotor
Does NNot
Run.
Is Heater
Plugged In?
Have all
Electrical
Connections
been Checked?
Plug heater in.
Repair or
Replace as
Necessary.
Yes
No
Yes
Yes
Replace Power Cord.
Is
Proper
Voltage Supplied
to heater?
A. Check Circuit
Breakers.
B. Check for Proper
Length and Gauge of Extension Cord, if used.
C. Contact a qualified
Electrician.
Defective Motor. Replace Motor.
No
No
Yes
Is
Proper Voltage
Being Delivered
Through Heater
Power
Cord?
No
17

Problem 22
Fan MMotor
Runs, HHeater Does NNot
Light.
Are
Fuel Supply
Valves Open to
the Heater?
Is Ignition
Module
Receiving Proper
Voltage?
Open all Fuel
Supply Valves to
the Heater.
A. Check Electrical
Connections. Repair or Replace as Necessary.
B. Check Voltage
Source. Contact Qualified Electrician if Necessary.
Yes
No
Yes
Yes
Is Proper
Gas Pressure Supplied
to the Heater? (See
Dataplate.)
Provide Proper Gas Pressure to Heater Inlet.
Check High Voltage Lead for Continuity. Replace if Necessary.
Check Igniter Gap.
(Gap is 1/8 in.)
Reposition the Igniter.
Plugged Burner Orifice.
Clean with Compressed
Air or Replace Orifice
if Necessary.
Defective Igniter. Replace the Igniter.
Connect Lead.
No
No
Yes
Does Igniter
Spark?
No
Yes
Is
There Proper
Gap from Igniter
to Burner
Plate?
No
Yes Yes
Has
Igniter High
Voltage Lead Been
Checked for
Continuity?
No
Yes
Is Igniter Gap
Facing Toward
Burner Orifice?
No
Is Igniter High
Voltage Lead
Connected?
No
18

Yes
Yes
Problem 33
Heater Lights BBut
Does NNot
Stay LLit.
Is Proper Gas
Pressure Supplied
to the Heater?
Is the
Thermocouple
Contact Nut tight at
the Gas Control
Valve?
Provide Proper
Gas Pressure.
(See Dataplate.)
Check for Dirt Between
Contact Button of
Thermocouple and
Electromagnet of Valve.
Blow Out if Necessary.
Snug the Contact Nut in
Place with Appropriate
Wrench.
Yes
No
Yes Yes Yes
Yes Is
Thermocouple Tip
Properly Positioned?
Tip Should be
Exposed 1/2 in.
from Burner
Plate.
A. Improper Igniter Gap.
(Gap to 1/8 in.)
B. Defective Igniter wire.
(Check for Continuity.)
C. Defective Igniter.
D. Defective Ignition
Control.
Keep Button
Depressed to
Allow Proper
Warm Up.
Does Igniter
Continually
Spark?
Is Control
Valve Button Fully
Depressed?
Fully Depress the
Control Button.
No No No
No
No
Are
Backflash Switch
Contacts “Closed”.
(Perform Continuity
Check.)
Determine Cause of
Backflash Switch
Opening. (See
Problem 5.)
No
Have Individual
Wires Been Checked from
thermocouple Energy Cut-Off
to Relay and Backflash
Switch?
Check Individual
Wires for Continuity.
No
Has
Thermocouple Millivolt
Strength Been Checked
with Multimeter?
Set Multimeter to D.C.
Volts. Apply Probes to
Terminals on Energy
Cut Off Block of
Thermocouple.
Readings of 10 D.C.
Millivolts and Above
are Acceptable.
Replace Thermocouple
for Readings under
10 M.V.
Yes
No
Has Drop Out
of Pilot Control Magnet
Been Checked with
Multimeter?
Follow Same
Procedure for
Checking
Thermocouple. Close
Gas Supply Valve to
Heater. When Control
Valve Magnet
Releases, Reading
Should be 10 Millivolt
D.C. or Lower. If
Control Valve Magnet
Releases Above 10
Millivolt D.C., Replace
Control Valve.
Yes
No
Is Relay
Receiving Proper
Voltage?
(See Dataplate.)
Check Wiring to
Relay for Continuity.
Repair or Replace.
Relay Contacts Do Not Close. Replace Relay.
Yes
Yes
Did You Allow
Sufficient Time for the
Thermocouple to Warm Up
(30-60 Seconds)
Before Releasing
Button?
No
19