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Bloom 400 Greenhouse Heater
www.lbwhite.com
Owner’s Manual • Bloom 400
18
Control Box Components
FIG. 6
A
Ignition Control
B
Air Pressure Switch
C
Heat Relay
D
Vent Relay
E
Red Status Light
A. Ignition Control
The ignition control is an electronic circuit board
that starts the fan motor, and monitors burner flame
presence through the ignitor and earth ground. (A
good, secure earth ground is required for continued
operation. If the earth ground is missing or poorly
connected, the ignition control will not be able to
prove flame, and it will eventually shut the heater
down)
Refer to the following and Fig. 7 to understand the
ignition control’s terminal designators when doing
voltage checks on the ignition control.
LED:
Diagnostic light connection
MV:
120 VAC from ignition control to gas solenoid
valve.
PSI:
120 VAC from air pressure switch to ignition
control.
IND:
120 VAC from ignition control to motor relay.
The relay then sends the power to the motor.
L1:
120 VAC incoming power supply to ignition
control.
R:
No terminal.
PSO:
120 VAC from ignition control to air pressure
switch.
W:
No terminal.
FS:
No terminal.
GND:
Power cord and chassis ground.
NEU 3:
No connection
NEU 2:
Ignition control neutral
NEU 1:
Neutral for gas control valve.
B
E
C
D
A
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