Ignition Cable; Gas Control Valve - L.B. White Bloom 400 Owner's Manual And Instructions

-- Clean the igniter electrode and ground rod with a small,
wire brush or emery cloth.
-- Ensure igniter gap is 3 mm.
FIG. 13

Ignition Cable

The ignition cable provides high voltage from the ignition
control to the igniter to generate spark.
The cable is attached to the igniter and to the ignition
control in the control box.
Ensure the cable is securely connected at both ends. Poor
connections create poor spark and poor flame sense that
may cause the heater to shut down.
Testing the cable: Connect an ohm meter to both ends of
the cable. A good cable will read anywhere from 6 to 10 k
ohm.

Gas Control Valve

Gas Control Valve
The valve is operated when power is sent from the ignition
control to the solenoid valve during the ignition phase. The
solenoid stays open providing there is a good earth ground
and the ignition control can monitor burner flame presence
through the local sense ignitor.
1. Loosen either of the conduit collars "A"
2. Disconnect the solenoid valve wires.
3. Remove bolts "B"
4. Loosen flare nut "C"
Bloom 400 Greenhouse Heater
3 mm
Owner's Manual • Bloom 400
5. Remove gas control and regulator assembly from
heater.
6. Replace component as required.
FIG. 14
C
Gas Pressure Checks
Refer to the following procedure to ensure the heater is
operating at the correct pressure.
a. Using a 3/16 allen wrench, remove the pressure tap
plug at the side of the valve body. See Fig. 13.
b. Insert a 1/8 in. hose barb fitting at the port and connect
to a low pressure gas gauge. (L.B. White part number
500-00764)
c. Once the gauge has been installed, start the heater.
d. With the heater operating, ensure the gauge registers
the burner manifold pressure given on the heater's data
plate.
e. If the gauge is reading lower or higher pressure than
what is given on the data plate, the regulator controlling
inlet pressure to the heater requires adjustment.
f. Once the proper pressure has been established, remove
the gauge set and reinstall all pressure tap plug, tighten-
ing securely.
A
B
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