A.O. Smith G6-PVT4050NV Installation Instructions And Use & Care Manual page 32

MAINTENANCE
Removing and Replacing the
Gas Control Valve
Removing the Gas Control Valve:
Turn the gas control/
1
temperature knob to the
"OFF" position.
TO LIGHT PILOT:
PRESS / HOLD KNOB IN POSITION
PRESS IGNITER BUTTON UNTIL PILOT LIGHTS
RELEASE KNOB WHEN STATUS LIGHT BLINKS
LOW
VAC
OFF
PILOT
Figure 53 - Turn gas control/temperature knob
OFF.
Turn off the gas at the
2
manual shut-off valve on the
gas supply pipe.
Figure 54 - Gas valve in "off" position.
Drain the water heater. Refer
3
to the "Draining and Flushing
the Water Heater" section
(see page 30) and follow the
procedure.
Disconnect the A igniter
4
wire from the igniter lead
wire. Use needle nose pliers
to disconnect the B red (+) and
white (-) thermopile wires. Disconnect
C pilot tube (7/16" wrench) and
D manifold tube (3/4" wrench) at
the gas control valve/thermostat.
NOTICE: L.P. Gas systems use reverse
(left-hand) threads on the manifold
tube.
32 • Residential Gas Water Heater Use and Care Guide
S TAT U S L I G H T C O D E
F L A M E S S TAT U S
1
2
3
4
5
6
7
SCALDING RISK INCREASES
WITH HOTTER WATER
TO LIGHT PILOT:
PRESS / HOLD KNOB IN POSITION
STATUS
PRESS IGNITER BUTTON UNTIL PILOT LIGHTS
RELEASE KNOB WHEN STATUS LIGHT BLINKS
LOW
B
VAC OFF
PILOT
C
RED
D
A
Figure 55 - Gas valve connections.
Disconnect the ground joint
5
union in the gas piping.
Disconnect the remaining
pipe from the gas control valve/
thermostat.
Figure 56 - Ground joint union connection.
To remove the gas control
6
valve/thermostat, thread a 4"
section of gas pipe into the
inlet and use it to turn the gas control
valve/thermostat (counterclockwise.)
Do not use pipe wrench or equivalent
to grip body. Damage may result,
causing leaks. Do not insert any sharp
objects into the inlet or outlet
connections. Damage to the gas
control valve/thermostat may result.
Replacing the Gas Control Valve:
To replace the gas control valve/
thermostat, reassemble in reverse
order. When replacing the gas control
valve/thermostat, thread a 4" section
of gas pipe into the inlet and use it to
turn the gas control valve/thermostat
(clockwise.) DO NOT OVER TIGHTEN,
damage may result.
4"
Gas Pipe
WHITE
Figure 57 - Gas control valve with threaded
pipe.
• Be sure to use approved thread
sealant tape or pipe joint compound
on the gas piping connections and
fitting on the back of the gas control
valve that screws into tank.
• Be sure to remove the pilot ferrule
nut from the new gas control valve/
thermostat.
• Turn the gas supply on and check for
leaks. Test the water heater with the
main burner on by brushing on an
approved noncorrosive leak detec-
tion solution. Bubbles forming indi-
cate a leak. Correct any leak found.
Figure 58 - Gas valve in "on" position.
• Be sure tank is completely filled with
water before lighting and activating
the water heater. Follow the "Light-
ing Instructions" on page 24.
• If additional information is required,
contact our Technical Assistance
Hotline which is listed on the water
heater's warranty sheet.
S TAT U S L I G H T C O D E
F L A M E S S TAT U S
1
2
3
4
5
6
7
SCALDING RISK INCREASES
WITH HOTTER WATER
TO LIGHT PILOT:
PRESS / HOLD KNOB IN POSITION
STATUS
PRESS IGNITER BUTTON UNTIL PILOT LIGHTS
RELEASE KNOB WHEN STATUS LIGHT BLINKS
LOW
VAC OFF
PILOT
WHITE
RED