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Follow steps 1 - 6 on initial start-up after heater installation
by a qualified gas heater service person.  For normal start-
up, simply turn thermostat above room temperature.  The
heater will start.

1.

Open all manual fuel supply valves and check for gas
leaks using approved leak detectors.  The gas control
valve on the heater has a manual shut-off feature
incorporated into the valve assembly.  Make sure the
indicator on the valve is turned to the on position.
See Fig. 10.

FIG. 10

2.

Connect the electrical cord to an approved electrical
outlet.

3.

Set the thermostat (if supplied) to desired room
temperature.

4.

This heater includes a hot surface ignition (HSI)
control module for purposes of controlling the timing
of the ignition process of the heater as well as
monitoring of the safety functions.  The HSI module is
contained within the control enclosure.  
When the heater receives a call for heat, the red light
emitting diode (LED) on the ignition control will come
on.  This LED indicates the status of the heater.  The
LED is visible through the plastic window of the

control box. A constant light from the LED is an
indicator that the heater is functioning correctly.  

5.

On a call for heat, the motor will start and run for five
(5) seconds and then stop.  This pre-purge is a safety
feature and a normal operational characteristic prior
to ignition taking place.  After the motor has stopped,
the igniter will heat up (approximately 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 installations.  The heater may
attempt more than one trial for ignition before
the air is finally purged from the line and
ignition takes place.

6.

The HSI control will make up to three trials for
ignition.  Each trial for ignition will take approximately
20 seconds.  The first two trials for ignition will occur
within 40 seconds if ignition is not achieved.  A 15
minute wait period will then begin after the second
trial for ignition has taken place.  After the 15 minute
time has passed, the third and final trial for ignition
will take place.  If ignition is not achieved at this final
trial, the system will lock out, and a three flash
pattern will be indicated by the LED.  

7.

Do not exceed input rating stamped on nameplate or
manufacturer’s recommended burner orifice pressure
for size orifice(s) used.  Make certain that the primary
air supply to main burner is open and free of dust, dirt
and debris for complete, proper combustion.

If the heater is to be shut down for cleaning, maintenance or
repair, follow steps 1 - 5.  Otherwise, simply turn thermostat
to off or no heat for standard shut down.

1.

Close all manual fuel supply valves.

2.

With the heater lit, allow heater to burn off excess
fuel in gas supply hose.

3.

Turn the indicator on the gas control to off.

4.

Turn thermostat to off or no heat position.

5.

Disconnect the heater from the electrical supply.

12

Start-Up Instructions

Shut-Down Instructions

ON

OFF

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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