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Propane gas and natural gas have a distinctive odor.
Learn to recognize these odors.  (Reference Fuel Gas
Odor and Odor Fading sections above.

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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.

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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.

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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!

Safety Precautions

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  IMMEDIATE  ACTION!

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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.

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Get everyone out of the building and away from the area
immediately.

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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.

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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.  

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Natural gas is lighter than air and can collect around
rafters or ceilings.

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Use your neighbor’s phone and call your fuel gas 

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

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Stay out of the building and away from the area until
declared safe by the firefighters and your fuel gas 

supplier.

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FINALLY, 

let the fuel gas service person and the

firefighters check for escaped gas.  Have them air out
the building and area before you return.  Properly
trained service people must repair the leak, check for
further leakages, and then relight the appliance for you.

WARNING

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Do not use this heater for heating human living
quarters.

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Do not use in areas without proper air exchange.  See
air exchange requirements on page 4 or on heater’s
dataplate.

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Exhaust fans, supply air inlets, or exhaust fan outlets
must not be obstructed.

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Proper air exchange must be provided for either indoor
or outdoor mount installations.

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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.

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Lack of proper air exchange will lead to improper
combustion.

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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.

Asphyxiation Hazard

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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.  

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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.  

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Smoking can decrease your ability to smell.  Being
around an odor for a period of time can affect your
sensitivity to that particular odor.

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

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If there is an underground leak, the movement of gas
through the soil can filter the odorant.  

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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.

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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.

FUEL GAS ODOR

ODOR FADING -- NO ODOR DETECTED

ATTENTION -- CRITICAL POINTS TO REMEMBER!

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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