L.B. White HW 120 User Manual
Owner's Manual and Instructions
Therma Grow
MODELS OUTPUT (Btuh) FUEL
™
Greenhouse Heaters
HW120 120,000
Available in
either L.P. Gas
Vapor
Withdrawal or
Natural Gas
Configurations.
Congratulations!
You have purchased the finest greenhouse 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,atL.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.
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 and
is listed and approved 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.
150-27701
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 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.
FOR YOUR SAFETY
Do not store or use gasoline or other
flammable vapors and liquids in the vicinity
of this or any other appliance.
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.
WARNING
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
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.
2
TableofContents
SECTION
GeneralInformation...................................................................3
HeaterSpecifications .................................................................4
SafetyPrecautions ....................................................................5
Installation Instructions
General .........................................................................7
AirDischargeDiverterDuctInstallationInstructions .....................................8
IndoorVentiIationRequirements .....................................................9
Airinlet ......................................................................9
ExhaustFan .................................................................10
HangingtheHeater...............................................................10
SedimentTrapAssemblyInstructions................................................11
ThermostatInstallationInstructions .................................................11
ManualShut-OffValve,HoseandRegulatorAssemblyInstructions .......................11
Start-UpInstructions .................................................................12
Shut-DownInstructions ...............................................................12
CleaningInstructions.................................................................13
Maintenance Instructions .............................................................13
Service Instructions
General ........................................................................14
Motor&FanAssembly ............................................................14
AirProvingSwitch ................................................................15
TestingtheManualResetHighLimitSwitch ..........................................15
BurnerOrificeandGasControlValve ................................................15
GasPressureChecks .............................................................16
IgniterandFlameSensor ..........................................................17
TroubleshootingInstructions...........................................................18
ElectricalConnectionandLadderDiagram ...............................................24
HeaterComponentFunction...........................................................25
PartsIdentification(PartsList&Schematic).........................................26&27
WarrantyPolicy .....................................................................28
ReplacementPartsandService ........................................................28
PAGE
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.
General Information
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.
3
Heater Specifications
Model
SPECIFICATIONS
Propane Natural
Gas Gas
Maximum Input (BTUH) 120,000
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 300 CFM
(1)
SHUTTERED AIR INLET 120 sq. in.
SHUTTERED
(1)
EXHAUST OUTLET
MAX. 13.5 11.0
MIN. 11.0 7.0
5.0 3.1
5.56 lbs. 120 cu. ft.
HW120
64 sq. in.
Ball Bearing
1/3 H.P.
1,100 RPM
Electrical Supply
(Volts/Hz/Phase)
STARTING
Amp Draw
Dimensions (Inches)
LxWxH
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.
CONTINUOUS
OPERATION
TOP 1ft.
SIDES 1ft.
BACK 1ft.
BLOWER
OUTLET
GAS Propane Gas Supply — 6 ft. (1.83 m)
SUPPLY Natural Gas Supply — N/A
115/60/1
11.8
4.5
30 3/4 x 21 x 28 1/4
6 ft. (1.83 m)
4
WARNING
Asphyxiation Hazard
■ 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.
LP gas and natural gas have man-made odorants added specifically for detection of fuel gas leaks.
■ 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.
Safety Precautions
■ 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.
FUEL GAS ODOR
If a gas leak occurs, you should be able to smell the fuel gas.
THAT’S YOUR SIGNAL TO GO INTO IMMEDIATE ACTION!
rafters or ceilings.
■ Use your neighbor’s phone and call your fuel gas
supplier and your fire department. Do not re-enter the
building or area.
■ Stay out of the building and away from the area until
declared safe by the firefighters and your fuel gas
supplier.
■ FINALLY, let the fuel gas service person and the
firefighters check for escaped gas. Have them air out
the building and area before you return. Properly trained
service people must repair the leak, check for further
leakages, and then relight the appliance for you.
■ Natural gas is lighter than air and can collect around
■ Some people cannot smell well. Some people cannot
smell the odor of the man-made chemical added to
propane (LP) or natural gas. You must determine if you
can smell the odorant in these fuel gases.
■ Learn to recognize the odor of propane gas and natural
gas. Local propane gas dealers 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.
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.
ODOR FADING -- NO ODOR DETECTED
■ The odorant in propane gas and natural gas is
colorless and the intensity of its odor can fade under
some circumstances.
■ If there is an underground leak, the movement of gas
through the soil can filter the odorant.
■ Propane gas odor may differ in intensity at different
levels. Since propane gas is heavier than air, there may
be more odor at lower levels.
■ Always be sensitive to the slightest gas odor. If you
continue to detect any gas odor, no matter how small,
treat it as a serious leak. Immediately go into action as
discussed previously.
■ 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!
5
1. Do not attempt to install, repair, or service this heater
or the gas supply line unless you have continuing
expert training and knowledge of gas heaters.
Qualifications for service and installation of this
equipment are as follows:
To be a qualified gas heater service person, you
a.
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:
- 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.
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. 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.
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.
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.
6
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.
Installation Instructions
GENERAL
Direct fired heaters discharge combustion by-products with
the heated air in to the area being heated. These include
CO, CO
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:
Indoor Mounted Heater:
Outdoor Mounted Heater:
,NO,NO2, and Ethylene. These gases can result in
2
-- An exhaust fan capable of providing at least 300 cfm
of discharge air.
-- An inlet shuttered louver of at least 120 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 64 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.
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.
All gas pressure regulators must be installed in strict
6.
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:
WARNING
Fire and Explosion Hazard
■ Do not use open flame (matches, torches, candles, etc.)
in checking for gas leaks.
■ Use only approved leak detectors.
■ Failure to follow this warning can lead to fires or
explosions.
■ Fires or explosions can lead to property damage,
personal injury or loss of life.
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 23578.
4.
The heater must have the proper gas regulator installed
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.
-- 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 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.
7
only
-- If a leak is detected, check the components
involved for cleanliness in the thread areas and
proper application of pipe compound before
further tightening.
-- 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.
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
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.
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 26113 (Accessory)
1. The air discharge diverter duct provides improved
directional air flow and greater heat throw, beneficial
o
in heating long houses. Use the duct
mounted heaters. Do not use the diverter when the
heater is mounted outside the greenhouse. 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
SCREWS
PERFORATIONS
FROM KIT
on indoor
VANES
MUST BE
DIRECTED
DOWNWARD
2. Remove the screws at both sides of the blower outlet.
3. Install flanges as shown in Fig. 2, using the same
screws. Tighten the screws securely.
4. Position the diverter assembly over the flanges. Align
holes in diverter to flange holes.
5. Fasten the diverter to the flanges with the screws
provided. See Fig. 3.
FIG. 2 FIG. 3
8
INDOOR VENTILATION REQUIREMENTS
Air Inlet
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 # 25995.
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
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 26005 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
AIR SOURCE
MOTORIZED AIR INLET
ALIGNED TO AIR INLET
IN BASE OF HEATER
9
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