L.B. White 220 Plus Therma Grow - Manual (Page 15)

For initial start-up after heater installation, read steps 1-6. For
normal star t-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 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 assembly. 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.
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 problem
i n t h e o p e r a t i o n o f t h e h e a te r. Re fe r to t h e
troubleshooting decal adjacent to the control box for
assistance in troubleshooting. Only qualified and properly
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 pattern 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 accomplish this task.
C. Off
Position the switch to midpoint.
5. The gas control valve in this heater is a two stage control.
When a call for heat occurs, the valve will open to its first
stage rate. Depending upon temperature requirements
and temperature control setting, the valve will then either
remain at first stage heat rate before the temperature
control is satisfied, or the valve will open completely to its
second stage capacity. If the valve opens to its second
stage capacity, it is designed to revert back to its first
stage heat rate before controller shuts heater down.
6. 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.
ON
OFF
14
Start-Up Instructions
HEAT
(UP)
OFF
(MID)
VENT
(DOWN)