Service Procedures; Removing Control Valve And Burner Tube - Vanguard GVB50P Owner's Operation And Installation Manual

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.
30
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.
Control Valve
Bracket
Orifice
Holder
Thermocouple
Interrupter
Thermocouple
Figure 22 - Removing Control Valve and Burner Tube
WARNING
Control Rod
Control Valve
Burner
Tube
Wire Connector
Cotter Pin
Mounting
Screw
Wire Connector
Pilot Gas Line
100354