L.B. White 220 User Manual

Owner's Manual and Instructions

Therma Grow

MODELS OUTPUT (Btuh) FUEL

™

Greenhouse Heaters

HW220 220,000

Available in either

L.P. Gas Vapor

Withdrawal or

Natural Gas

Configurations.

Congratulations!

You have purchased the finest agricultural building 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].

ATTENTION ALL USERS

This heater has been tested and evaluated by C.S.A. International, in
accordance with IAS U.S. Requirements for Gas-Fired Greenhouse Heaters,
for use as a direct gas-fired circulating heater for the heating of greenhouses.
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.

150-27595

GENERAL HAZARD WARNING

2

■ 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 heater.

■ 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, building damage, or loss of plant life.

■ Gas pressure below the minimum inlet pressure specified at the heater inlet may cause

improper combustion.

■ Improper combustion can lead to asphyxiation or carbon monoxide poisoning and therefore

serious injury or death to humans and plant life.

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.

Fire and Explosion Hazard

■ Keep solid combustibles a safe distance

away from the heater.

■ Solid combustibles include wood or paper

products, straw, and dust.

■ Do not use the heater in spaces which

contain or may contain volatile or airborne

WARNING

combustibles.

FOR YOUR SAFETY
Do not store or use gasoline or other
flammable vapors and liquids in the vicinity of

■ Volatile or airborne combustibles include

gasoline, solvents, paint thinner, dust
particles or unknown chemicals.

this or any other appliance.

■ Failure to follow these instructions may

FOR YOUR SAFETY
If you smell gas:

1. Open windows.

result in a fire or explosion.

■ Fire or explosions can lead to property

damage, personal injury or loss of life.

2. Don't touch electrical switches.

3. Extinguish any open flame.

4. Immediately call your gas supplier.

Table of Contents

3

SECTION PAGE

General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Heater Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Installation Instructions

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Air Discharge Diverter Duct . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Indoor Installation Requirements

Air Inlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Exhaust Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Hanging the Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Sediment Trap Assembly Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Thermostat Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Manual Shut-Off Valve, Hose and Regulator Assembly Instructions . . . . . . . . . . . . . . . . . . . . . . . .11

Start-Up Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Shut-Down Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Cleaning Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Maintenance Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Service Instructions

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Motor & Fan Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Air Proving Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Manual Reset High Limit Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Burner Orifice and Gas Control Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Gas Pressure Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Igniter and Flame Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

Troubleshooting Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Electrical Connection and Ladder Diagram

115 Volt Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

230 Volt Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

Heater Component Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

Parts Identification (Parts List & Schematic) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27 & 28

Warranty Policy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

Replacement Parts and Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

General Information

This Owner's Manual includes all options and accessories
commonly used on this heater. However, depending on the
configuration purchased, some options and accessories
may not be included.

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 interior of either the burner end or motor end
door.

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. A
detailed Installation and Service Guide is available, at no
charge, to qualified personnel by contacting the local
L.B. White distributor, dealer or the L.B. White Company.

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.

4

Heater Specifications

SPECIFICATIONS

HW220

Model

Propane Natural

Gas Gas

Maximum Input (BTUH) 220,000

Indoor Mounting Air
Exchange Requirements

Outdoor Mounting Air
Exchange Requirements

Inlet Gas Supply
Pressure Acceptable at
the Inlet of the Heater
for Purpose of Input
Adjustment (In. W.C.)

Burner Manifold
Pressure (In. W.C.)

Fuel Consumption Per
Hour

Motor Characteristics

EXHAUST FAN 550 CFM

(1)

SHUTTERED AIR INLET 220 sq. in.

SHUTTERED

(1)

EXHAUST OUTLET

MAX. 13.5 11.0

MIN. 11.0 7.0

5.0 3.1

10.19 lbs. 220 cu. ft.

100 sq. in.

Ball Bearing

1/2 H.P.

1,100 RPM

Electrical Supply
(Volts/Hz/Phase)

115 VOLT MOTOR

STARTING

Amp Draw

CONTINUOUS
OPERATION

Dimensions (inches)
L x W x H

TOP 1 ft.
SIDES 1 ft.

Minimum Safe
Distances From Nearest
Combustible Materials

(1) Air inlets and exhaust outlets must be electromechanically operated and electrically interlocked with the

heater to prevent heater operation if air inlet and exhaust outlet do not open when heating is required.

BACK 1 ft.
BLOWER

OUTLET

GAS Propane Gas Supply — 6 ft. (1.83 m)
SUPPLY Natural Gas Supply — N/A

230 VOLT MOTOR

115 VOLT MOTOR

230 VOLT MOTOR

115/60/1

230/60/1

17.1

6.7

6.2

2.6

35 x 25 x 30

6 ft. (1.83 m)

4

5

LP gas and natural gas have man-made odorants 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 IMMEDI

ATE ACTION !

FINALLY,

WARNING

Asphyxiation Hazard

Some people cannot smell well. Some people cannot
smell the odor of the man-made chemical added to
propane or natural gas. You must determine if you can
smell the odorant in these fuel gases.

The odorant in propane gas and natural gas is colorless
and the intensity of its odor can fade under some
circumstances.

Always be sensitive to the slightest gas odor.

Safety Precautions

■ Do not use this heater for heating human living

quarters.

■ Do not use in areas without proper air exchange. See

air exchange requirements on page 4 or on heater’s
dataplate.

■ Exhaust fans, supply air inlets, or exhaust fan outlets

must not be obstructed.

■ Proper air exchange must be provided for either indoor

or outdoor mount installations.

FUEL GAS ODOR

■ 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.

■ Refer to the specification section and installation

instructions of the heater’s Owner’s Manual, heater
dataplate, or contact the L.B. White Company to
determine air exchange requirements of the heater.

■ Lack of proper air exchange will lead to improper

combustion.

■ Improper combustion can lead to carbon monoxide

poisoning in humans leading to serious injury or death.
Symptoms of carbon monoxide poisoning can include
headaches, dizziness and difficulty in breathing.

■ Natural gas is lighter than air and can collect around

rafters or ceilings.

■ Use your neighbor’s phone and call your fuel gas

supplier and your fire department. Do not re-enter the
building or area.

■ Stay out of the building and away from the area until

declared safe by the firefighters and your fuel gas

supplier.

■

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.

let the fuel gas service person and the

ODOR FADING -- NO ODOR DETECTED

■

■ Learn to recognize the odor of propane gas and natural

gas. Local propane gas dealers and your local natural
gas supplier (utility) will be more than happy to give you
a scratch and sniff pamphlet. Use it to become familiar
with the fuel gas odor.

■ Smoking can decrease your ability to smell. Being

around an odor for a period of time can affect your
sensitivity to that particular odor.

■

■ 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.

■

continue to detect any gas odor, no matter how small,
treat it as a serious leak. Immediately go into action as
discussed previously.

ATTENTION -- CRITICAL POINTS TO REMEMBER!

■ Propane gas and natural gas have a distinctive odor.

Learn to recognize these odors. (Reference Fuel Gas
Odor and Odor Fading sections above.

■

If you have not been properly trained in repair and service
of propane gas and natural gas fueled heaters, then do
not attempt to light heater, perform service or repairs, or
make any adjustments to the heater on propane gas or
natural gas fuel system.

5

■ 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!

If you

1. Do not attempt to install, repair, or service this heater

6

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 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.Refer to
the following:

6. Do not operate the heater with its door open.

7. Do not locate fuel gas containers or fuel supply
hoses anywhere near the blower outlet of the heater.

8. Do not block air intakes or discharge outlets of the
appliance. Doing so may cause improper combustion
or damage to heater components leading to property
damage or plant loss.

9. 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.

10. Check for gas leaks and proper function upon heater
installation, before building repopulation or when
relocating.

11. This heater should be inspected for proper operation
by a qualified service person before building
repopulation and at least annually.

12. Always turn off the gas supply to the heater if the
heater is not going to be used.

13. Heaters requiring 230 volts electrical supply must
have electrical wiring consisting of two hot leads, a
neutral lead, and a ground lead. All GreenGro
heaters, regardless of voltage, must be properly
connected to a grounded electrical supply. Failure
to use a grounded electrical supply can result in
electrical shock, serious injury, or death.

-- 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. Do not move, handle, or service heater while in
operation or connected to a power or fuel supply.

4. This heater may be installed in areas subject to
washdown. This heater may only be washed on the
external case assembly—see Cleaning Instructions.
Do not wash the interior of the heater. Use only
compressed air, soft brush or dry cloth to clean the
interior of the heater and it’s components. After
external washdown, do not operate this heater until it
is completely dry. In any event, do not operate the
heater for at least one hour after external washdown.

5. For safety, this heater is equipped with a manual
reset high-limit switch and an air proving 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.

14. Direct ignition heaters will make up to three trials for
ignition. If ignition is not achieved, the control system
will lock out the gas control valve. If gas is smelled
after system lock out has occurred, immediately close
all fuel supply valves. Do not relight until you are sure
that all gas that may have accumulated has cleared
away. In any event, do not relight for at least 5
minutes.

15. In a hanging type installation, rigid pipe or copper
tubing coupled directly to the heater may cause gas
leaks during movement, and therefore must not be
used. Use only gas hose assemblies that are rated
and approved for L.P. gas and natural gas in a
hanging type of installation.

16. Installations not using the gas hose supplied with this
appliance must connect dimensionally using
American National Standard Wrought Steel and
Wrought Iron Pipe B36/10-1970. (Aluminum piping
or tubing shall not be used.) Copper tubing when
used for conveying natural gas, shall be internally
tinned or equivalently treated to resist sulphur.

6

Indoor Mounted Heater:

Outdoor Mounted Heater:

7

Installation Instructions

WARNING

Fire and Explosion Hazard

GENERAL

Direct fired heaters discharge combustion by-products with
the heated air in to the area being heated. These include
CO, CO2, NO, NO2, and Ethylene. These gases can result in
harm to the worker or the plants.

This greenhouse heater has been specifically developed for
very low levels of these combustion by-products. However,
it is necessary to have an exchange of air within the
greenhouse to avoid accumulation of these gases to a
harmful level over an extended period of operating time.

Greenhouses have a natural air leakage factor. This natural
leakage is influenced by the design and physical condition
of the greenhouse as well as wind conditions and other
factors. This natural leakage factor can not be relied upon
as being sufficient to provide the necessary air exchange
within the greenhouse. Proper installation of the GreenGro
greenhouse heater must include provision for adequate air
exchange as follows:

I

-- An exhaust fan capable of providing at least 550
cfm of discharge air.

-- An inlet shuttered louver of at least 220 sq. in. area.

-- The inlet shutters must be electromachanically
operated and electrically interlocked with the heater
such that the heater can not operate if the inlet
shutters do not open when heating is required.

-- Refer to Indoor Ventilation Requirements in this
manual.

-- An exhaust shuttered louver of at least 100 sq. in.
area.

-- The exhaust shutter must be electromechanically
operated and electrically interlocked with the heater
such that the heater can not operate if the exhaust
shutters do not open when heating is required.

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.

Make sure the heater is properly positioned before use
and is hung level. 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. The heater may be used either indoors or outdoors.
For heaters intended for outdoor installation, the
heater is to be installed at least 18 inches above the
ground or to a height that would prevent snow
blockage of heater’s air inlet. Refer to instructions
provided in the optional L.B. White outdoor mounting
and ducting kit, part number 23579.

The heater must have the proper gas regulator installed

4.
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.

5. The heater’s gas regulator (with pressure relief valve)

should be installed outside of building. Any
regulators inside the buildings must be properly
vented to the outside. Local, state and national
codes always apply to regulator installation. Natural
gas regulators with vent limiting device may be
mounted indoors without venting to outdoors.

6.

All gas pressure regulators must be installed in strict
accordance with the manufacturer’s safety instructions.
These instructions accompany each regulator.

7. Insure that all accessories that ship within the heater
have been removed from inside of heater and
installed. This pertains to air diverters, hose,
regulators, etc.

8. Make certain that a sediment trap is installed at the
gas valve inlet to prevent foreign materials (pipe
compound, pipe chips and scale) from entering the
gas valve. Debris blown into the gas valve may cause
that valve to malfunction resulting in a serious gas
leak that could result in a possible fire or explosion
causing loss of products, building or even life. A
properly installed sediment trap will keep foreign
materials from entering the gas valve and protect the
safe functioning of that important safety component.

9. Any heater connected to a piping system must have
an accessible, approved manual shut off valve
installed within six feet (6 ft.) of the heater it serves.

10. Check all connections for gas leaks using approved
gas leak detectors. Gas leak testing is performed as
follows:

■ 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.

-- 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.

-- Furthermore tighten the gas connections as

necessary to stop the leak.

-- After all connections are checked and any leaks

only

8

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.

dataplate for the gas configuration of the specific
heater. Do not use the heater in an L.P. gas liquid
withdrawal system or application. If you are in doubt,
contact the L.B. White Co., Inc.

15. Eventually, like all electrical/mechanical devices, the
thermostat can fail. Thermostat failure may result in
either an underheating or overheating condition which
may damage or kill plants. Plants should be
protected by a separate back-up control system that
limits high and low temperatures and also activates
appropriate alarms.

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.

11. A qualified service agency must check for proper
operating gas pressure upon installation of the
heater.

12. Light according to instructions on heater or within
owner's manual.

13. It is extremely important to use the proper size and

type of gas supply line to assure proper functioning of
the heater. Contact your fuel gas supplier for proper
line sizing and installation.

14. This heater can be configured for use with either L.P.

gas vapor withdrawal or natural gas. Consult the

1. The air discharge diverter duct provides improved
directional air flow and greater heat throw, beneficial

o

in heating long houses. Use the duct

on indoor
mounted heaters. Do not use the diverter when the
heater is mounted outside the green house. The
diverter duct requires hand forming prior to assembly.
Make 90 degree bends utilizing the performations
provided. Assemble as shown in Fig. 1.

FIG. 1

PERFORATIONS

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.

18. Do not exceed input rating stamped on the dataplate
of the heater. Do not exceed the burner manifold
pressure stated on the dataplate. Do not use an
orifice size different than specified for the specific
input rating of this heater, fuel type configuration and
altitude.

AIR DISCHARGE DIVERTER DUCT

Part Number 25977

(Accessory)

2. Remove the upper and lower screws at both sides of
the blower outlet, and the two screws at outlet top.

3. Install flanges as shown in Fig. 2, using the same
screws. Tighten the screws securely.

4. Position the diverter over the flanges. Align holes in
diverter to flange holes and to vacant holes at top
and bottom of blower outlet.

5. Fasten the diverter to the flanges with the screws
provided. See Fig. 3.

PERFORATIONS

VANES
MUST BE
DIRECTED
DOWNWARD

SCREWS
FROM KIT

FIG. 2 FIG. 3

SCREWS REMOVED AT OUTLET TOP

UPPER
SCREW

LOWER
SCREW

INDOOR VENTILATION REQUIREMENTS

Air Inlet

9

This heater requires a properly sized, motorized air inlet
shutter and exhaust fan for indoor installation. These
components, along with specific instructions, are provided
in indoor ventilation kit # 25985.

Locate the air inlet directly beneath the heater and align it
to the heaters air inlet for combustion air supply. Ensure
the motorized air inlet and the heater’s air inlet are kept
free of any blockages.

■ The air inlet must be located directly beneath the

heater’s air inlet, and have access to outside fresh air.
See Fig. 4a.

■ The heater draws its combustion air through holes in its

base. The motorized air inlet must be centered to the
heater’s air inlet. See Fig. 4b.

■ The motorized air inlet must be no more than 1 ½ ft.

from the back of the heater and properly aligned to the
heater. See Fig. 4c.

■ The heater should have a minimum clearance of 1 ½ ft.

above the ground. See Fig. 4c.

FIG. 4b

Underside View

FIG. 4c

Side View

HEATER AIR INLET

1 1/2 FT MAX.

AIR INLET

TRANSITION

CENTERED

INTERIOR EXTERIOR

OUTSIDE
FRESH AIR

OUTSIDE

AIR SOURCE

Refer to Figs. 4a, 4b, and 4c for air inlet placement. If the
air inlet must be installed away from the heater in a location
other than as follows, duct kit part number 25987 must
also be installed to allow supply of combustion air to the
heater.

FIG. 4a

Blower Outlet View

1 1/2 FT MAX.

AIR

DISCHARGE

1 1/2 FT

MIN.

1 1/2 FT

MAX.

TOP OF AIR INLET
TRANSITION ALIGNED
WITH BASE OF HEATER

OUTSIDE

OUTSIDE

AIR SOURCE

FRESH AIR

MOTORIZED AIR INLET
ALIGNED TO AIR INLET

IN BASE OF HEATER

E

Exhaust Fan

must

FIG. 5

The exhaust fan

be located at an upper area of the
end wall opposite from the heater, preferably in an area
higher than the heater’s discharge. See Fig. 5. The fan
does not need to be directly in line to the heater. Ensure the
exhaust fan is kept free of blockage.

EXHAUST FAN IN UPPER AREA OF
GREENHOUSE

CHAIN OR CABLE

AIR FLOW

ENTRY / EXIT

AIR INLET LOCATED

DIRECTLY BENEATH HEATER

AIR INLET.

HANGING THE HEATER

As shipped, the heater is configured for mounting to an
optional mounting bracket kit, part number 23652, which is
installed on freestanding supports or mounted directly to
the structure’s wall. Separate installation instructions
accompany the kit.

The heater may also be suspended by chain to the
greenhouse’s overhead structure by using an optional chain
hanging kit, part number 07802. Refer to the following
instructions.and illustrations.

1. Remove case top hole plugs. See Fig. 6.

FIG. 6

2. Assemble eyebolts and chain according to the
illustration and tighten all eyebolts securely.

FIG. 7

EYE BOLT

CHAIN

NUT 1/4-20

FLAT WASHER

FLAT WASHER

HEATER TOP

NUT 1/4-20

3. Ensure the heater is securely fastened to overhead
supports and is hanging level. (Check crosswise and
lengthwise.)

4. See Fig. 5 for typical indoor installation. In any
installation, consideration must be given to making
sure the heater is located away from the people
entering or exiting the greenhouse so they cannot
accidentally knock the heater or tamper with the
heater and its gas supply line in any way. Additionally,
the heater must be located so that it does not block
the normal entryway or exit of the building. Observe
and obey minimum clearance distances to
combustible materials as stated in the specification
section of this owner’s manual and on the heater’s
dataplate.

10

To Connect the Series Tap Plug Thermostat Kit:

To Connect the Direct Wired Thermostat Kit to the
Control Box on the Heater:

WARNING

Electrical Shock Hazard

11

Check all
conne c t i ons f or gas leaks using appro v e d g a s leak
detectors.

SEDIMENT TRAP ASSEMBLY

Assemble the tee, nipples and cap together and tighten
securely. See Fig. 8. The sediment trap assembly must
always be mounted in a vertical

position. Make sure pipe
thread compound that is resistant to both L.P. gas and
natural gas is used in making all connections.

THERMOSTAT INSTALLATION

■ Disconnect the electrical supply before connecting the

thermostat to the heater.

■ Failure to follow this warning can result in electrical

shock, leading to personal injury or death.

T

1.

a. Connect the power cord of the heater to the

female side of the plug on the end of the
thermostat cord.

b. Plug the male side of the series tap plug on the

thermostat cord into a three-wire (grounded)
electrical outlet within the building.

FIG. 8

NIPPLE

HOSE ADAPTER

TO GAS CONTROL

VALVE INLET

2.

a. The installation and wiring of a thermostat must

be done by an electrician or someone properly
qualified.

b. The thermostat may use 18 gauge, 2 wire cord to

handle the low voltage being supplied to the
thermostat from the transformer.

c. Follow all instructions provided with the

thermostat kit.

d. The heater must be tested for proper operation

after the thermostat has been connected.

TEE

NIPPLE

CAP

MANUAL SHUT-OFF VALVE, HOSE
AND REGULATOR ASSEMBLY

1. Always use approved pipe thread compound suitable
for use with L.P. gas or natural gas on the threaded
connections.

2. Assemble the components together according to the
figure. This view is to show general assembly of the
components only. The regulator must always be
mounted so its vent, regardless of location on the
regulator, is always pointed downward.

3. Tighten all connections securely and check for gas
leaks.

FIG. 9

REGULATOR VENT

TO CONTROL

VALVE INLET

REGULATOR

NIPPLE

VALVE, MANUAL
SHUT-OFF

GAS FLOW

GAS HOSE

ADAPTER

SEDIMENT TRAP

12

Start-Up Instructions

Follow steps 1 - 6 on initial start-up after heater installation
by a qualified gas heater service person. For normal start­up, simply turn thermostat above room temperature. The
heater will start.

1. Open all manual fuel supply valves and check for gas
leaks using approved leak detectors. The gas control
valve on the heater has a manual shut-off feature
incorporated into the valve assembly. Make sure the
indicator on the valve is turned to the on position.
See Fig. 10.

FIG. 10

ON

OFF

2. Connect the electrical cord to an approved electrical
outlet.

3. Set the thermostat (if supplied) to desired room
temperature.

LED is visible through the plastic window of the
control box. A constant light from the LED is an
indicator that the heater is functioning correctly.

5. On a call for heat, the motor will start and run for five
(5) seconds and then stop. This pre-purge is a safety
feature and a normal operational characteristic prior
to ignition taking place. After the motor has stopped,
the igniter will heat up (approximately 17 seconds).
After igniter warm up time has been achieved, the
motor will start again and shortly thereafter ignition
will occur.

NOTE: 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
the air is finally purged from the line and
ignition takes place.

6. The HSI control will make up to three trials for
ignition. Each trial for ignition will take approximately
20 seconds. The first two trials for ignition will occur
within 40 seconds if ignition is not achieved. A 15
minute wait period will then begin after the second
trial for ignition has taken place. After the 15 minute
time has passed, the third and final trial for ignition
will take place. If ignition is not achieved at this final
trial, the system will lock out, and a three flash
pattern will be indicated by the LED.

4. This heater includes a hot surface ignition (HSI)
control module for purposes of controlling the timing
of the ignition process of the heater as well as
monitoring of the safety functions. The HSI module is
contained within the control enclosure.
When the heater receives a call for heat, the red light
emitting diode (LED) on the ignition control will come
on. This LED indicates the status of the heater. The

If the heater is to be shut down for cleaning, maintenance or
repair, follow steps 1 - 5. Otherwise, simply turn thermostat
to off or no heat for standard shut down.

1. Close all manual fuel supply valves.

2. With the heater lit, allow heater to burn off excess
fuel in gas supply hose.

7. 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 dust, dirt
and debris for complete, proper combustion.

Shut-Down Instructions

3. Turn the indicator on the gas control to off.

4. Turn thermostat to off or no heat position.

5. Disconnect the heater from the electrical supply.

1

13

WARNING

Cleaning Instructions

WARNING

Fire, Burn, and Explosion Hazard

■ This heater contains electrical and mechanical components 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.

1. Before cleaning, shut off all gas supply valves and
disconnect electrical supply.

2. At least once a year give the heater a thorough
cleaning, preferably before the beginning of the fall
heating season. At that time, remove the fan and
motor assembly and brush or blow off the fan wheel.
Additionally, ensure the burner casting and orifice are
free of dust accumulation, insect nests, webs, etc.

Maintenance Instructions

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.

Do not use a pressure washer, water, or liquid cleaning
solution on any heater components. 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 internal components of the heater with
pressurized air, a dry brush, or a dry cloth.

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, start­up and shut-down instructions and warnings are
available at no cost. A nominal charge will be applied
for wiring diagrams.

1

14

MOTOR MOUNT PLATE

WARNING

Burn Hazard

■ 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

component part of the heater, including regulators
and gas hoses.

■ All components must be replaced if defects are

found.

■ Failure to follow this warning will result in gas leaks.

■ Gas leaks cause fire or explosions, leading to

property damage, injury, or death.

Service Instructions

GENERAL

4. The thermostat, and high limt switch can be tested by
jumpering the suspect part out of the electrical
circuit.:

-- Reconnect the electrical supply and open fuel
supply valves.

-- If the heater lights, the component is defective
and must be replaced.

-- Do not operate the heater with the component
jumpered. Replace the part immediately.

-- An alternate method for checking the
components is to perform a continuity check.

5. Do not jumper the air proving switch. If jumpered, the
ignition control will not allow heater operation. Test
the air proving switch for continuity. If defective,
replace the switch

6. For reassembly, reverse the respective service
procedure. Ensure gas connections are tightened
securely.

1. Close the fuel supply valve to the heater and
disconnect the electrical supply before servicing
unless necessary for your service procedure.

2. Open end panels for access to heater components.

3 Disconnect the appropriate electrical leads for the

component being replaced.

1. Remove the motor mounting plate screws and pull
the fan and motor assembly from the housing.

2. Loosen the square head set screw(s) on the fan
wheel.

3. Pull the fan wheel from the motor shaft. Use a wheel
puller if necessary.

4. Remove the four (4) nuts securing the motor to the
mounting plate.

7. After servicing, start the heater to ensure proper
operation. Check for gas leaks with approved leak
detectors.

8. 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 AND FAN WHEEL ASSEMBLY

NOTES:a. Fan wheel to motor mount plate spacing must be

adjusted to the clearance specified in the table
below before tightening the fan wheel to the
motor shaft.

b. Make sure that set screw(s) of the fan are on the

flats of motor shaft when tightening.

FIG. 11

FAN WHEEL

MOTOR

CLEARANCE

1/8 IN.

1

15

AIR PROVING SWITCH

Be
careful not to melt the plastic housing of the switch
when conducting this test.

WARNING

Fire Hazard

1. Remove two sheet metal screws holding air proving

FIG. 12

switch assembly to blower housing. Remove
assembly by turning switch assembly 90 degrees so
the switch paddle can be pulled through oblong hole
on side of fan housing. See Fig. 12.

3. Disconnect the leads from the air proving switch.

SWITCH W/ PADDLE

4. When installing replacement switch, use care in not
bending the switch arm, otherwise ignition problems
may occur. Replacement includes mounting bracket.

LEADS

TESTING THE MANUAL RESET HIGH LIMIT SWITCH

■ Do not operate the heater with the high limit switch

bypassed.

■ Operating the heater with a bypassed high limit switch

may lead to overheating, possibly resulting in a fire,
with subsequent damage to the heater, building
damage, or loss of livestock.

3. Within a minute, you should hear a pop coming
from the switch, which indicates the contacts of the
switch have opened.

4. Allow the switch cool down for about a minute
before firmly pressing the red reset button on the
switch.

5. Check for electrical continuity across the switch
terminals to make sure the contacts have closed.

HOUSING SIDE
PANEL

NUTS

PADDLE

OBLONG HOLE

The high limit switch should be tested a minimum of once

6. Reinstall the switch back into the heater.

per year when the heater is given a thorough cleaning.

FIG. 13

1. Remove the high limit switch from the heat
chamber.

2. Holding the switch by one of its mounting legs or
electrical terminals, apply a small flame only to the
sensing surface on the back of the switch.

BURNER ORIFICE and GAS CONTROL VALVE

1. Remove the following

-- Hose and sediment trap from inlet of gas valve

-- Screws securing valve bracket to heater base.

-- Burner bolt from underside of base.

-- Screws and spacers securing burner casting to
heat chamber.

2. Remove control valve with burner from heater. Rotate
the valve/manifold assembly as necessary so orifice
and orifice block can exit the burner casting venturi
port..

3. Replace components as needed.

FIG. 14

RESET BUTTON

TERMINAL

MOUNTING
LEG

GAS CONTROL
VALV E

SENSING
SURFACE

FLAME

ORIFICE
BLOCK

1

BURNER
ORIFICE

T

A. Preparation

B. Gauge Installation

C. Reading Pressures

D. Completion

Gas Pressure Checks

WARNING

16

■ Do not disassemble the gas control valve.

■ Do not attempt to replace any components of the gas

control valve.

■ The gas control valve must be replaced if any physical

damage occurs to the control valve assembly.

■ Failure to follow this warning will result in fire or

explosions, leading to injury or death to humans, and
property damage.

ATTENTION

■ 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 inlet to the gas valve is

Inlet Pressure and gas pressure measured at the outlet
of the gas valve is Burner Manifold Pressure.

A

1. Obtain two pressure gauges capable of reading up to
35 in. W.C.

2. Disconnect the heater from the electrical supply and
close the fuel supply valve to the heater inlet.

3. Open the burner access panel.

2. Securely connect a pressure gauge to each pressure
tap.

3. Open the fuel supply valves to the heater and
reconnect the heater electrical supply.

4. Start the heater

1. With the heater operating, the pressure gauges
should read the pressures specified on the dataplate
.

2. Do the readings at the inlet and outlet pressure
gauges 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.

4. If the inlet pressures are correct and the burner
manifold pressure does not agree with that specifed
on the dataplate, then the gas control valve’s internal
pressure regulator requires adjustment. See Fig. 16
for regulator location.

FIG. 16

OUTLET PRESSURE TAP

INTERNAL PRESSURE REGULATOR

LOW PRESSURE GUAGE

ON

OFF

INLET PRESSURE TAP

LOW PRESSURE GUAGE

4. Brush or blow off any dust and dirt on or in the vicinity
of the gas control valve.

1. Locate the inlet and outlet pressure taps, see Fig. 15.
Remove the pressure tap plug using a 3/16 in. allen
key.

FIG. 15

ON

OFF

INLET PRESSURE TAP

OUTLET PRESSURE

OUTLET PRESSURE
TAP

TYPICAL PRESSURE GAUGE INSTALLATION. ALWAYS

EXAMPLE SHOWS PRESSURE FOR PROPANE GAS

REFER TO DATA PLATE FOR FUEL TYPE AND

ALWAYS REFER TO PRESSURE ON DATAPLATE

PRESSURE REQUIREMENTS.

1. Once the proper inlet and burner manifold pressures
have been confirmed and/or properly set, close the
fuel supply valve 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 gauges and connecting hoses.

4. Install pressure tap plugs and tighten securely.
Check for gas leaks.

17

IGNITER

1. Disconnect the plastic male and female plugs
located at the end of the igniter leads. See Fig. 17.

2. Loosen the screw securing the igniter shield and the
igniter to the mounting bracket. Remove the igniter
and shield.

3. Ensure the igniter is located so the its lip on back
side of igniter is resting on the edge of the mounting
bracket and the mounting hole in the igniter aligns
with the mounting hole in the bracket.

4. Slide the igniter shield over the igniter so hole in
shield aligns with hole in igniter and bracket.

FLAME SENSOR

1. Remove the sensor from its mounting bracket. Clean
the sensor’s rod with emery cloth or steel wool to
buildup of dirt to help maintain proper flame sense.
See Fig. 17.

2. Check the flame sensor’s insulative base for any
cracks. If cracks are found, replace the sensor.

■ Handle the igniter by its ceramic base, or by its leads.

■ Center the igniter shield over the igniter element,

making sure the shield does not touch the igniter
element, otherwise igniter damage will occur when the
igniter is energized.

■ Do not overtighten the igniter mounting screw.

Overtightening may crack the base of the igniter,
leading to premature failure.

For proper flame sense operation, the flame sensor tip

■

must be properly positioned within the burner flame.
See Fig. 18.

FIG. 18

FIG. 17

SCREW

IGNITER

SHIELD

WASHER

MALE CONNECTOR

SENSOR

SCREW

FEMALE CONNECTOR

BURNER

BRACKET

BURNER
FLAME

BURNER
CASTING

1/2 in. to 3/4 in.

3/8 TO 1/2 IN.

FLAME SENSOR

1

Troubleshooting Instructions

OPPERATION SEQUENCE:

IGNITIOON TTRIAL SEQUENCE:

18

READ THIS ENTIRE SECTION BEFORE BEGINNING TO
TROUBLESHOOT PROBLEMS.

WARNING

■ This heater can start at any time.

■ 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 personal

injury or death.

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 voltage and resistance.

• Low Pressure Gauge - for checking inlet and outlet

pressures at the gas control valve against dataplate rating.

INITIAL PREPARATION

The

■ Visually inspect equipment for apparent damage.

■ Check all wiring for loose connections and worn

insulation.

The ignition control module is self-diagnostic. The red light
located on the control will flash a specific pattern depending
upon the problem which is diagnosed. To use the flow charts, t
identify the problem by the light pattern of the L.E.D. (light
emitting code) diagnostic light. If the light is flashing, the flash
pattern will be followed by a pause and then a repeat of the
flash pattern until the problem is corrected. The light will only
be on when the selector switch is positioned to HEAT and the
thermostat or controller is calling for heat. The light will not be
on when the selector switch is positioned to VENT.

Heating Mode Problems

L.E.D. light is not on during a call for heat. . . . . . . . . . . . . . . 19

L.E.D. diagnostic light is flashing:

A. Rapid flash . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

B. Long flash ( 2 seconds on-2 seconds off) . . . 20

C. One time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

D. Two times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

E. Three times. . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

F. Four times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

G.Five times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

H.Six times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Page

-- Line voltage is sent to motor relay and transformer

-- Terminal at transformer branches off line voltage to terminal
L1 on ignition control.

-- Transformer reduces line voltage to 24 VAC.

-- 24 VAC is sent to thermostat.

-- Thermostat contacts close on call for heat and return 24
volts to terminal W on ignition control.

-- Red light on ignition control is illuminated.

-- Ignition control sends flame sense current to flame sensor.

-- Ignition control module performs self safety check.

-- Internal components are tested.

-- Air proving circuit is tested

-- Control sends 24 VAC from terminal PSI to air . . .
proving switch.

-- Ignition control module begins ignition trial sequence.

-- Ignition control sends 115 volts from terminal IND to motor
relay.

-- Motor relay closes.

-- Line voltage is sent to motor

-- Motor starts.

-- Air proving switch closes and 24 volts are returned to
terminal PSO of ignition control.

-- Motor stops.

-- Ignition control module sends 115 volts to hot surface igniter.

-- Igniter reaches ignition temperature in 17 seconds.

-- Ignition control restarts the fan motor while sending 24 VAC
to air proving switch.

-- Switch closes and 24 volts is returned back to control.

-- Ignition control send 24 volts from terminal GV to high limit
switch.

-- If limit switch contacts are closed, limit sends 24 volts
to gas control valve

-- Gas control valve opens

-- Ignition occurs.

-- Flame sense current is passed through burner flame back to
ignition control.

-- Igniter stays powered until ignition control proves flame sense

-- Igniter then shuts down.

-- Gas control valve stays open

-- Room warms to desired temperature.

-- Thermostat is satisfied.

-- Heater shuts down.

-- Process starts again on a call for heat.

-- First trial for ignition takes approximately 30 seconds

-- Two more ignition trials occur

-- Second trial immediatley follows if first trial failed.

-- If second trial fails

-- Ignition control starts a 15 minute waiting period

-- Allows the ignition interruption to pass

-- At end of 15 minutes

-- Ignition control attempts third and final ignition trial

-- If igntion control does not prove burner flame after third

trial, the control goes into safety lockout ( 3 flash)

-- Gas valve closes.

-- Hot surface igniter shuts down

-- Fan motor stops.

-- To retry for ignition, turn the heater off and then on.

LED Light

Not On

Does

transformer

Yes

Is 24 volts

delivered to

Yes

reduce

incoming

Yes

No

thermostat?

No

volts?

voltage to 24

No

Check wiring between

transformer and

thermostat. Check

continuity. Repair as

needed.

Defective transformer.

Relace transformer.

Replace thermostat

Defective

ignition control.

Is transformer

receiving proper

Yes

Is proper voltage

supplied to heater?

Yes

Normal Operation

Is heater

connected to

power supply?

voltage?

No

No

Check wiring for

continuity between

transformer and power

supply. Repair or replace

requirments.

Provide proper

electrical supply

voltage, contact

Check data plate for

breakers

supply. Check

Ensure heater is

connected to power

electrician.

Yes

Is

continuity.

thermostat

defective? Check for

Yes

Is

above room

thermostat set

No

No

temperature?

Yes

Are 24 volts

from thermostat?

control terminal W

supplied to ignition

above room

temperature.

Set thermostat

No

Defective wire or

Reapir or replace.

electrical connection.

19

LED Constant On

Problem

LED Flashing

One Time

Flash Pattern

Begins

Immediately

After Condition

Occurs.

Free the switch .

Rapid Flash

Long Flash

Determine casue of

flapper binding.

Check for damage to

fan housing,.

Yes

Replace air proving switch

Yes

Remove jumper from switch.

Yes

Problem

Reverse polarity. Have electrician check neutral and hot wire

Is

No

housing?

binding in fan

ignition control module will present the three time flash pattern. Either recycle the heater or wait for

Heater has attempted two ignition trials. Heater is in a 15 minute wait period before attempting its third

connections that outlet heater is connected to.

heater to attempt third ignition trial.

(final) trial for ignition. If ignition is not achieved after the third trial, the heater will lock out and the

airflow switch arm

Is

continuity.

air proving switch stuck

closed or shorted ? Check

No

been jumpered?

Has air proving switch

No

Defective wire or poor

Repair wire or connections.

connections to air proving switch.

Two seconds

on, two seconds

off repetitively

for 15 minutes.

20

21

Two Times

Defective ignition

control. Replace

ignition control.

Check for binding of

air-proving switch arm

on housing, Repair or

replace as necessary.

Yes

Check for proper clearance of

fan wheel to motor mount. If

good, replace fan wheel, or

check for housing alignment.

Tighten set screw(s) on fan. Make

sure set screw(s) are tightened

against flat(s) of motor shaft.

Clean the fan wheel with

compressed air or soft brush.

Remove obstruction.

Clean as necessary.

Yes

Yes

from air proving

switch to terminal

PSO on controller?

Are 24 volts returned

Yes

from terminal PS1

air proving switch?

on controller to the

Are 24 volts supplied

Yes

No

Are air-proving switch

No

component. Repair or replace as

Check wiring between module and

necessary. If wiring is good, replace

No

check.)

(Perform continuity

contacts stuck open?

Replace motor.

Defective motor.

Yes

Is

ignition control module.

voltage sent from

relay to motor?

Yes

binding?

Is fan wheel

No

Check wiring between

No

replace relay

needed. If good,

relay and motor. If

defective, repair as

Yes

shaft?

Is fan wheel

loose on motor

No

Yes

dirt?

Is fan wheel

plugged with

No

Defective air proving switch. Replace switch.

No

Is there an obstruction

air-proving switch closure?

in blower outlet preventing

Does

2

for heat?

for prepurge

during initial call

fan motor start up

Flash pattern

begins 12

seconds after

condition

Yes

No

No

- OR -

from ignition

control terminal

IND to motor relay

Are 115 volts sent

occurs.

(Pattern

indicates

lack of air

proving in fan

section

of unit.)

contact electrician.

If improper voltage is supplied,

relay , check wiring bewtween

If no voltage is supplied to motor

motor relay and ignition control. If

good, replace control.

22

Three Times

No

--

Replace

sensor.

Are 24 volts

the high limit

supplied from

control valve?

switch to the gas

Yes

of controller to

high limit switch

Are 24 volts sent

from terminal GV

after igniter warm

up and fan motor

Yes

closed?

Are high limit

switch contacts

Yes

to heater?

Is proper gas

pressure supplied

Yes

restarts?

No

No

valve. Check wiring

Check for voltage to

and repair if defective.

replace limit switch.

If wiring is good and

voltage is not present,

No

control.

replace ignition

Check for voltage to

Perform continuity check.

If switch is open reset the switch.

If wiring is good and

switch. Check wiring

and repair if defective

voltage is not present,

Obstructions in air inlets or

Check the following:

-- Confirm correct fuel for heater.

-- Proper voltage to motor

-- Dust and dirt build-up

-- Plugged fan assembly

-- Fan not tightened to motor

discharge outlet of heater.

gauge.

Provide proper

and check with a

pressure to heater

Yes

Is

insulator

cracked?

flame sensor

Yes

Is flame

sensor clean?

Yes

sensor?

checked

control and

Has wiring been

between ignition

Yes

glow?

Does igniter

No

Is

flame sensor

No

steel wool.

with emery cloth or

Clean flame sensor

No

module and

Check wiring between

Yes

No

Is igniter

properly

positioned?

or replace .

component. Repair

properly

connected?

No

Position flame

sensor so 1/2 -

Defective igniter.

Perform continuity

check and replace

Yes

Are

115 volts

supplied from

ignition control

terminal HSI on

No

Connect igniter

burner flame.

3/4 in. of tip is in

igniter If necessary.

No

igniter?

module to

Check wiring between module and

supply wiring.

to igniter power

component. Repair or replace as

necessary or replace ignition control .

properly

Is heater

grounded?

Yes

Is

LP tank

heater open?

supply valves to

full and properly

sized and are all gas

Ignition

failure Heater

does not light

or stay lit.

No

grounded for

System must be

Contact electrician.

proper operation.

No

gas supply valves

Fill tank or resize if

necessary. Open all

Yes

No

Have

the burner

blockage?

orifice, burner

been checked for

casting and manifold

Remove orifice and

out with compressed

burner casting. Blow

soft brush.

air or clean with a

Yes

Yes

Is proper

outlet of gas

burner manifold

pressure read at

No

valve?

is read, adjust outlet

pressure.

(A) If low or high pressure

read, replace the gas

control valve.

(B) If gas pressure is not

2

23

Five Times

Six Times

Four Times

If HSI board does not reset, then replace the board. (Internal board fault.)

If HSI board resets, then have qualified electrician check power source for

power quality problems. (Frequency, line noise, line spikes, loose connections,

too small wire gauge.)

See flame sensor related problems in

three time flash pattern.

Low microamp output from flame sensor. The heater will

continue to operate as normal. Flame sense is low and that

flame failure or improper operation can occur at any time. See

flame sensor related problems in three time flash pattern.

2

Rapid On/Off

cycling of the

burner.

24

Electrical Connection and Ladder Diagram

115 Volt Supply

120 VOLT

2

25

230 Volt Supply

2

120 VOLT

26

Heater Component Function

Air Proving Switch

Safety device used to insure that the proper air flow is being
achieved before the gas valve is opened.

Burner

Cast iron component used to channel gas and provide an
area at which the fuel may ignite.

Burner Orifice

Brass metering device used to feed gas to burner at a
specific rate.

Fan Housing

Chamber used for delivering air for efficient air movement.

Fan Wheel

Component used in conjunction with the motor and fan
housing to pull the hot air from heater and blow it into room
for heating (also known as a squirrel cage).

Gas Control Valve

A device which consists of a low pressure regulator and
electrical solenoids which are used for the control of gas
flow to the burner assembly. A feature of the control is a
built in gas shut off which is used to isolate the heater from
its gas supply when servicing.

Gas Hose

Flexible connector used to convey gas from supply line in
building to heater.

Heat Chamber

Metal “fire box” within the appliance that provides an area
where burner flame mixes with combustion air, thereby
providing heat.

High Limit Switch

Safety device wired into the control system which is used to
break an electrical circuit to the gas control valve in event of
overheat situation.

Hot Surface Igniter

Ignition device used on automatic ignition control systems.
Ignites gas by surface temperature rather than spark or
flame.

Ignition Control Module

Electronic printed circuit board which sends and receives
voltages to various controls in an automatic ignition system.
An important safety feature of the control board is that it will
shut down the entire heater, thereby stopping the flow of
fuel gas if burner flame goes out.

Motor

Electric device used to force preheated air through the
heater and to circulate heat within a certain area. Converts
electrical energy into mechanical energy.

Motor Relay

Electrical component wired between ignition control and
motor. Used to feed voltage to motor upon receipt of voltage
from ignition control.

Regulator

Mechanical device used in L.P. and natural gas distribution
systems to reduce a higher inlet pressure to a preset lower
pressure. The regulator is responsible to supply a steady
outlet pressure to the heater(s) despite changes in inlet
pressure, heater demand and weather conditions.

Thermostat

Electrical device used as an automatic “on/off” switch
which will respond to changes in temperature in a certain
area. Can be wired so contacts in the thermostat open or
close on temperature increase or decrease.

Transformer

Electrical control used to accept line power supply primary
voltage and reduce it to lower secondary voltage to operate
certain control systems.

(Accessory)

2

27

Parts Identification

PARTS SCHEMATIC

30

28

22

29

25

35

38

37

39

27

13

26

34

33

32

31

14

1

12

11

2

36

23

24

21

20

19

16

17

5

6

7

8

18

15

9

2

10

3

4

28

Parts Identification

Item Description Part Number

PARTS LIST

1 Regulator LP Gas 06553

Natural Gas 24414
2 Valve, Manual Shut Off with Nipple 03399
3 Hose, 1/2 x 10 ft., Rigid x Swivel 20714
4 Adapter, Hose, 1/2 NPT x 1/2 NPS 25873
5 Kit, Sediment Trap 00815
6 Screws (2) 572502
7 Bracket with Screws 570141
8 Valve, Gas Control LP Gas 570666

Natural Gas 570667
9 Manifold U Shape with Orifice LP Gas 572492

Natural Gas 572495

10 Washer and Bolt 25866
11 Base LP Gas 572493
12 Orifice LP Gas 570318

Natural Gas 570319

13 Burner w/ Mounting Hardware 25842
14 Spacers and Screws 570211
15 Igniter, Hot Surface 509201
16 Shield, Igniter 572494
17 Screw and Washer, Igniter Shield 572512
18 Bracket w/ Screws 570089
19 Flame Sensor 520139
20 High Limit Switch LP Gas 572501

Natural Gas 505566

21 Heat Chamber LP Gas 572499

Natural Gas 572500

22 Control Box w/Cover 572485
23 Window w/ O-Ring 570002
24 Cover, Control Box 572484
25 Relay, Motor 570221
26 Ignition Control 509298
27 Transformer 509615
28 Case Assembly, w/ Labels LP Gas, 115 Volt 572475

LP Gas, 230 Volt 572477

Natural Gas, 115 Volt 572480

Natural Gas, 230 Volt 572481

29 Door, Motor End 572488
30 Door, Burner End 572498
31 Fan Housing w/ Motor Mount and Air Proving Switch 572491
32 Fan Wheel 570440
33 Air Proving Switch 09925

34 Motor Mount 570251
35 Motor 115 Volt 25757

230 Volt 08635

36 Latch Kit 570228
37 Wire Harness, Igniter, Red 572503
38 Wire Harness, Neutral 230 Volt 572497
39 Power Cord 115 Volt 572486

2

Warranty Policy

HEATER

L.B. White Co., Inc. warrants that the component parts of its
heater are free from defects in material and workmanship,
when properly installed, operated, and maintained in
accordance with the Installation and Maintenance
Instructions, safety guides and labels contained with each
unit. If, within 12 months from the date of purchase by
the end user, any component is found to be defective,
L.B. White Co., Inc. will at its option, repair or replace the
defective part or heater, with a new part or heater, F.O.B.,
Onalaska, Wisconsin.

PARTS

L.B. White Co., Inc. warrants that replacement parts
purchased from the company and used on the appropriate
L. B. White equipment are free from defects both in material
and workmanship for 12 months from the date of
purchase by the end user. Warranty is automatic if a
component is found defective within 12 months of the date
code marked on the part. If the defect occurs more than 12
months later than the date code but within 12 months from
the date of purchase by the end user, a copy of a bill of sale
will be required to establish warranty qualification.

The warranty set forth above is the exclusive warranty
provided by L.B. White, and all other warranties, including
any implied warranties or merchantability or fitness for a
particular purpose, are expressly disclaimed. In the event
any implied warranty is not hereby effectively disclaimed
due to operation of law, such implied warranty is limited in

A warranty card on file at L.B. White will automatically
qualify a unit and its component parts for warranty
consideration. If a warranty card is not on file, a copy of the
bill of sale will be required to establish warranty
qualification. If neither is available, the warranty period will
be 12 months from date of shipment from L.B. White.

duration to the duration of the applicable warranty stated
above. The remedies set forth above are the sole and
exclusive remedies available hereunder. L.B. White will not
be liable for any incidental or consequential damages
directly or indirectly related to the sale, handling or use of
the equipment, and in any event L.B. White's liability in
connection with the equipment, including for claims based
on negligence or strict liability, is limited to the purchase
price.

Some states do not allow limitations on how long an implied
warranty lasts, so the above limitation may not apply to you.
Some states do not allow the exclusion or limitation of
incidental or consequential damages, so the above
limitation or exclusion may not apply to you. This warranty
gives you specific legal rights, and you may also have other
rights which vary from state to state.

Replacement Parts and Service

Contact your local L.B. White dealer for replacement parts
and service or call the L.B. White Co., Inc. at [phone]
for assistance. Be sure that you have your heater model
number and configuration number when calling.

29