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1.

Do not attempt to install, repair, or service this heater
or the gas supply line unless you have continuing
expert training and knowledge of gas heaters.  

Qualifications for service and installation of this
equipment are as follows:

a. To be a qualified gas heater service person, you

must have sufficient training and experience to
handle all aspects of gas-fired heater installation,
service and repair.  This includes the task of
installation, troubleshooting, replacement of
defective parts and testing of the heater.  You
must be able to place the heater into a continuing
safe and normal operating condition.  You must
completely familiarize yourself with each model
heater by reading and complying with the safety
instructions, labels, Owner’s Manual, etc., that is
provided with each heater.

b. To be a qualified gas installation person, you must

have sufficient training and experience to handle
all aspects of installing, repairing and altering gas
lines, including selecting and installing the proper
equipment, and selecting proper pipe and tank
size to be used.  This must be done in accordance
with all local, state and national codes as well as
the manufacturer’s requirements.

c. In the Commonwealth of Massachusetts, this

product must be installed by a gas fitter licensed
by the Commonwealth of Massachusetts

2.

All installations and applications of L.B. White heaters
must meet all relevant local, state and national
codes.  Included are 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, ;atest edition, Standard for Storage 

and Handling of Liquefied Petroleum Gas and/or

-- ANSI Z223.1/NFPA 54, National Fuel Gas Code
-- ANSI/NFPA70, 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.

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   qu a l i f i e d   s e r v i c e   p e r s o n   b e fo r e   b u i l d i n g
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.

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
a p p l i a n c e   m u s t   c o n n e c t   d i m e n s i o n a l l y   u s i n g
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

Summary of Contents for Therma Grow 120NG

Page 1: ...s Manual and Instructions Therma Grow Greenhouse Heaters View this manual online at www lbwhite com 150 27595 REV B ATTENTION ALL USERS This heater has been tested and evaluated by C S A Internationa...

Page 2: ......

Page 3: ...s 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...

Page 4: ...stributor 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...

Page 5: ...d electrically interlocked with the heater to prevent heater operation if air inlet and exhaust outlet do not open when heating is required Model Indoor Mounting Air Exchange Requirements 1 Burner Man...

Page 6: ...lding and area before you return Properly trained service people must repair the leak check for further leakages and then relight the appliance for you WARNING n Do not use this heater for heating hum...

Page 7: ...ipped 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 ar...

Page 8: ...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 4 The heater mu...

Page 9: ...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 indi...

Page 10: ...MI HD220 HD220 5B ENG BYNAME JIMI HD220 HD220 5B ENG BYNAME JIMI HD220 HD220 5B ENG BYNAME JIMI HD220 HD220 5B ENG BYNAME JIMI HD220 HD220 5B ENG BYNAME JIMI HD220 HD220 5B ENG BYNAME JIMI HD220 HD220...

Page 11: ...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...

Page 12: ...NTROL VALVE INLET REGULATORVENT GAS FLOW 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 accordin...

Page 13: ...roximately 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...

Page 14: ...Periodic cleaning and inspection as well as proper maintenance are essential to avoid serious injury or property damage 1 The area surrounding the heater shall be kept clear and free from combustible...

Page 15: ...ent 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...

Page 16: ...m 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 con...

Page 17: ...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 req...

Page 18: ...ocated at the end of the igniter leads See Fig 16 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 s...

Page 19: ...ition 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...

Page 20: ...ace thermostat Is heater connected to power supply No No No Yes Ensure heater is connected to power supply Check breakers Is transformer receiving proper voltage Check wiring for continuity between tr...

Page 21: ...r proving switch been jumpered Yes No Remove jumper from switch Rapid Flash Reverse polarity Have electrician check neutral and hot wire connections that outlet heater is connected to Long Flash Two s...

Page 22: ...sary No Is fan wheel plugged with dirt Is there an obstruction in blower outlet preventing air proving switch closure No Are 115 volts sent from ignition control terminal IND to motor relay No If impr...

Page 23: ...e and component Repair or replace as necessary or replace ignition control Provide proper pressure to heater and check with a gauge Check for voltage to switch Check wiring and repair if defective If...

Page 24: ...l 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 Four Times If HSI board does not reset then replac...

Page 25: ...24 Electrical Connection and Ladder Diagram 115 Volt Supply 120 VOLT...

Page 26: ...25 230 Volt Supply 120 VOLT...

Page 27: ...ation 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 bo...

Page 28: ...27 28 30 37 38 39 21 20 19 16 17 6 5 7 8 9 10 11 12 4 3 2 1 14 31 32 33 34 35 26 27 29 36 22 25 13 18 15 24 23 Parts Identification PARTS SCHEMATIC...

Page 29: ...r 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...

Page 30: ...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 no...

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