Vanguard Heating GVB35P - Manual (Page 30)

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SERVICE
PROCEDURES
Removing Control Valve
and Burner Tube
1. Shut off gas supply to
heater.
2. Remove lower front
access panel on heater.
3. Disconnect burner tube
from orifice holder (see
Figure 22).
4. Remove pilot gas line
from control valve (see
Figure 22).
5. Disconnect wire connec-
tors from thermocouple
interrupter (see Figure
22).
6. Remove thermocouple
and thermocouple inter-
rupter from control valve.
7. Remove cotter pin from
control valve. This
releases the control rod
from valve (see Figure
22).
8. Remove the two mounting
screws from control valve
mounting bracket (see
Figure 22).
9. Remove assembly from
the rear of heater.
10. To reinstall, reverse above
steps. Turn on gas to
heater and check for gas
leaks. Apply a mixture of
liquid soap and water to
all joints. Bubbles forming
show a leak. Correct all
leaks at once.
11. Replace lower front
access panel.
Figure 22 - Removing Control Valve and Burner Tube
Wire Connector
Control Valve
Bracket
Cotter Pin
Control Valve
Control Rod
Thermocouple
Interrupter
Burner
Tube
Orifice
Holder
Mounting
Screw
Wire Connector
Pilot Gas Line
Thermocouple
WARNING
Turn off and unplug heater and let cool before servicing.
Unless you need gas supply for testing, shut off manual
shutoff valve before servicing. Only a qualified service
person should service and repair heater and venting
system.