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Direct fired heaters discharge combustion by-products with
the heated air in to the area being heated. These include
CO, CO
, NO, NO
, and Ethylene. These gases can result in
2
2
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 this heater
must include provision for adequate air exchange as
follows:
Indoor Mounted Heater:
■
An exhaust fan capable of providing at least 200 cfm of
discharge air.
■
An inlet shuttered louver of at least 120 sq. in. area.
■
The inlet shutters must be electromechanically 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.
Outdoor Mounted Heater:
■
An exhaust shuttered louver of at least 64 sq. in. area.
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 23578.
Installation Instructions
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.
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 per tains to air diver ters, 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:
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.
--
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.
GENERAL
WARNING
7
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