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1.

To Connect the Series Tap Plug Thermostat Kit:

a.

Connect the power cord of the heater to the
fe m a l e   s i d e   o f   t h e   p l u g   o n   t h e   e n d   o f   t h e
thermostat cord.

b.

Plug the male side of the series tap plug on the
thermostat cord into a three-wire (grounded)
electrical outlet within the building.

2.

To Connect the Direct Wired Thermostat Kit to the
Control Box on the Heater:

a.

The installation and wiring of a thermostat must
be done by an electrician or someone properly
qualified.

b.

The thermostat may use 18 gauge, 2 wire cord to
handle the low voltage being supplied to the
thermostat from the transformer.

c.

Fo l l ow   a l l   i n s t r u c t i o n s   p rov i d e d   w i t h   t h e
thermostat kit.

d.

The heater must be tested for proper operation
after the thermostat has been connected.  

11

THERMOSTAT INSTALLATION

MANUAL SHUT-OFF VALVE, HOSE
AND REGULATOR ASSEMBLY

REGULATOR

NIPPLE

VALVE, MANUAL
SHUT-OFF

GAS HOSE

ADAPTER

SEDIMENT TRAP

TO CONTROL

VALVE INLET

REGULATOR VENT

GAS FLO

W

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 according to the
figure.  This 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 securely and check for gas
leaks.

FIG. 9

Assemble the tee, nipples and cap together and tighten
securely.  See Fig. 8.  The sediment trap assembly must
always be mounted in a vertical position.  Make sure pipe
thread compound that is resistant to both L.P. gas and
natural gas is used in making all connections.  Check all
connections for gas leaks using approved gas leak
detectors.

FIG. 8

SEDIMENT TRAP ASSEMBLY

NIPPLE

HOSE ADAPTER

TEE

NIPPLE

CAP

TO GAS CONTROL

VALVE INLET

WARNING

Electrical Shock Hazard

n

Disconnect the electrical supply before connecting the
thermostat to the heater. 

n

Failure to follow this warning can result in electrical
shock, leading to personal injury or death.

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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