background image

Propane (LP) 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 (LP) 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 (LP)
gas or natural gas fuel system.

Even if you are not properly trained in the service and
repair of the heater, ALWAYS be consciously aware of
the odors of propane (LP) 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!

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!

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
o r   a ny   ot h e r   s o u rc e   o f   f l a m e .     D o   n ot   u s e   yo u r
telephone.

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

Close all propane (LP) gas tank or cylinder fuel supply
valves, or the main fuel supply valve located at the
meter if you use natural gas.

Propane (LP) 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.  

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.

FINALLY, 

let the fuel gas ser vice 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

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.

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.

Asphyxiation Hazard

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 (LP) gas and
natural gas.  Local propane (LP) 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.

The odorant in propane (LP) 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 (LP) gas odor may differ in intensity at different
levels.  Since propane (LP) 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.

5

Safety Precautions

FUEL GAS ODOR

ODOR FADING -- NO ODOR DETECTED

ATTENTION -- CRITICAL POINTS TO REMEMBER!

Summary of Contents for Therma Grow HW220

Page 1: ...row Greenhouse Heaters View this manual online at www lbwhite com ATTENTION ALL USERS This heater has been tested and evaluated by C S A International in accordance with Canadian Gas Association Stand...

Page 2: ......

Page 3: ...ents 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...

Page 4: ...y 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 noti...

Page 5: ...cally operated and 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 Requirem...

Page 6: ...fore you return Properly trained service people must repair the leak check for further leakages and then relight the appliance for you WARNING Do not use this heater for heating human living quarters...

Page 7: ...te 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 or panel remov...

Page 8: ...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 ou...

Page 9: ...ure 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 ser...

Page 10: ...rovided in the duct kit Ensure the motorized air inlet and the heater s air inlet are kept free of any blockages FIG 4a Blower Outlet View FIG 4c Side View FIG 4d Alternate Air Inlet Locations ENG BYN...

Page 11: ...IG 6 2 Assemble eyebolts and chain according to the illustration and tighten all eyebolts securely FIG 7 3 Ensure the heater is securely fastened to overhead supports and is hanging level Check crossw...

Page 12: ...ent position the heater fan operates continuously In the vent mode the heater then supplements or provides air circulation within the greenhouse This heat vent capability can be controlled by a buildi...

Page 13: ...GREEN BROWN BROWN YELLOW YELLOW GAS CONTROL VALVE GROUND RED BLACK WHITE GREEN HI LO C BUILDING CONTROLLER HEAT CONTACT TO CONTROL FROM CONTROL LEAVE WIRE NUT ON LEAD HIGH LIMIT SWITCH GAS CONTROL VAL...

Page 14: ...s 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...

Page 15: ...art 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...

Page 16: ...ther 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 v...

Page 17: ...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 proper...

Page 18: ...icates 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 swi...

Page 19: ...e inlet pressure is correct but the burner manifold pressure does not agree with that specified on the dataplate then the HI and LO heat output feature of the gas control valve requires adjustment 5 T...

Page 20: ...d 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...

Page 21: ...ermostat Thermostat closes and returns 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 contr...

Page 22: ...ed to power supply Check breakers Is proper voltage delivered to selector switch Check all wiring for defects Repair or repalce if needed Yes Does selector switch send voltage to the transformer Check...

Page 23: ...f ignition is not achieved after the third trial the heater will lock out and the ignition control module will present the three time flash pattern Either recycle the heater or wait for heater to atte...

Page 24: ...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 25: ...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 26: ...mbly and housing Repair or replace as necessary Yes Reconnect wires to capacitor Defective capacitor Replace the motor No Yes Are wires disconnected from capacitor No Five Times Rapid On Off cycling o...

Page 27: ...26 Electrical Connection and Ladder Diagram 115 Volt Supply...

Page 28: ...27 230 Volt Supply TRANSFORMER 24 VOLT 120 VOLT...

Page 29: ...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...

Page 30: ...Parts Identification PARTS SCHEMATIC 29 39 40 41 26 38 25 21 29 27 31 37 36 35 34 33 14 13 15 18 20 19 16 17 6 7 8 9 10 11 12 4 3 2 1 5 28 24 23 22 32 30...

Page 31: ...9 19 Flame Sensor 520139 20 High Limit Switch LP Gas 572501 Natural Gas 505566 21 Heat Chamber LP Gas 572499 Natural Gas 572500 22 Boot Selector Switch 571939 23 Selector Switch w Boot 571906 24 Contr...

Page 32: ...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...

Reviews: