Start-Up Instructions - L.B. White Therma Grow HW120 Owner's Manual And Instructions

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Therma Grow™ Greenhouse Heaters

Start-Up Instructions

For initial start-up after heater installation, read
steps 1-6. For normal start-up, simply set the
thermostat above room temperature.
1. Connect electrical cord to an approved electrical
outlet.
2. Set thermostat to desired room temperature.
3. This heater has a manually operated toggle style
selector switch located adjacent to the control
box. This switch allows you to either heat or
ventilate (no heat). See Fig. 10 for selector switch
positions.
FIG. 10
A. Heating
a. Open all manual fuel supply valves. Check for
gas leaks using an approved leak detector. The
gas control valve on the heater has a manual
shut-off feature incorporated into the valve as-
sembly. Make sure the indicator on the valve is
turned to the ON position. See Fig 11.
FIG. 11
b. 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.
Owner's Manual • Therma Grow™
When the selector switch is positioned to heat, the red
light emitting diode (LED) on the ignition control will
be 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.
Any flash pattern by the LED indicates there is a prob-
lem in the operation of the heater. Refer to the
troubleshooting decal adjacent to the control box for
assistance in troubleshooting. Only qualified and prop-
erly trained personnel shall service or repair the heater.
c. 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.
4. 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 pat-
tern will be indicated by the LED.
B. Ventilation
When the selector switch is positioned to vent, the red
light will NOT be on. The fan motor will start, but the
igniter will not be powered, nor will ignition occur. This
feature is used typically when heat is not needed, but
air circulation is required. To discontinue the ventilation
feature, position the switch to off or heat, or use the
interconnected contacts (customer supplied) to ac-
complish this task.
C. Off
Position the switch to midpoint.