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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.

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:

-- CAN 1 -B149.1 or CAN1-B149.2 Installation

Codes

-- C S A   C 2 2 .1,   P a r t 1   S t a n d a rd   C a n a d i a n

Electrical Code, CSA C22.2 No.3, Electrical
Features of Fuel Burning Equipment

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 or panel
removed.  

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
heater.  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 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, at beginning of heating season or when
relocating.

11.

This heater should be inspected for proper operation
by a qualified service person before the start of fall
heating season 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 heater 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.

6

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...

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