22
GAS CONTROL VALVE
Important:
Use only factory authorized replacement parts.
If you lack the necessary skills to properly perform the
installation, you should not proceed, but get help from a
quali
fi
ed service technician.
Tools required:
3/4” Open-End Wrench
short length of 1/2” threaded pipe
Pipe Wrench
Removing Gas Control Valve
Set the gas control valve/thermostat to its lowest
setting by turning the knob counter-clockwise to the
VAC point (see Figure 3).
Turn gas control switch to the “OFF” position and turn
off the gas supply to the unit (see Figure 3).
Disconnect the electrical power to the water heater
from the wall outlet.
Release water pressure by opening a nearby hot
water faucet, let run until water is cool to touch. Turn
off water supply to the water heater.
Remove the outer door from the unit.
Connect a drain hose to the drain valve and run it to
an adequate drain or to the exterior of the building.
Open the water heater drain valve and allow the water
to drain from the tank.
Unplug all the electrical connections from the bottom
of the gas control valve/thermostat (see Figure 26).
Using a 3/4” open end wrench remove the manifold
tube from the gas control valve/thermostat (turning
counter-clockwise for natural gas, clockwise for L.P.).
Grasp the manifold tube and push down slightly to
free the manifold tube from the gas control valve/
thermostat (see Figure 26).
Ensuring that the gas supply line is turned off,
disconnect the gas piping at the ground joint union,
then remove the gas piping from the gas control
valve/thermostat.
Remove any other
fi
ttings that may be installed on the
threaded pipe to the gas control valve/thermostat.
After ensuring the water heater is completely drained,
thread a short length of 1/2” threaded pipe into the
inlet connection of the gas control valve/thermostat
and use it to turn the gas control valve/thermostat
counter-clockwise to remove (see Figure 27). Do not
use any type of wrench on the valve body as it may
cause damage to the gas control valve/thermostat
assembly.
•
•
•
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
Installing Gas Control Valve
Do not apply any sealant tape to the gas control/
thermostat threads that screw into the tank. The
threads have a pre-applied white sealing material.
Thread a short length of 1/2” threaded pipe into
the inlet connection of the new gas control valve/
thermostat and use it to turn the gas control valve/
thermostat clockwise to tighten into place (
Note:
Do
Not over tighten or damage may result, but it needs
to be water tight (see Figure 27).
Remove the 1/2” threaded pipe from the gas control
valve/thermostat.
Reconnect the gas piping to the gas control valve/
thermostat, use Te
fl
on® tape or an approved pipe
sealant on threads of the piping.
Close the drain valve and turn on the cold water supply
line
fi
lling the tank completely with water. Purge the
water lines of any excess air by opening a hot water
faucet allowing the water to
fl
ow for a minimum of 3
minutes, allowing the tank to
fi
ll completely.
Reconnect the manifold tube to the gas control valve/
thermostat (
Note:
Do Not apply any thread sealant
at this connection). To prevent any cross threading
the manifold tube should be started by hand (turn
clockwise for natural gas, counter-clockwise for L.P.).
Upon tightening with the
fi
ngers and con
fi
rming it has
not been cross threaded, tighten nut with an 3/4” open
end wrench (see Figure 26).
Reconnect all the electrical connections to the bottom
of the gas control valve/thermostat, gently pushing
each connector up snapping into place (see Figures
10 & 26).
Turn on the gas supply to the unit and test the gas
supply line and union connections by brushing on an
approved noncorrosive leak detection solution. (
Note:
Do not splash the solution on control. If a leak is
detected, shut the water heater down by following the
directions on the “Lighting and Operating Instructions”.
Repair the leak(s) and repeat leak test).
Reconnect the electrical power to the water heater in
the wall outlet and turn the gas supply back on to the
gas control valve/thermostat.
Restart the water heater by following the directions on
the “Lighting and Operating Instructions” label located
on the front of the water heater.
As the burner is heating (view flames through
viewport), test the manifold tube connection at the
gas control valve/thermostat by brushing on an
approved noncorrosive leak detection solution.
Important:
Do Not splash any solution onto any
electrical connections.
Upon verifying proper operation of the water heater,
replace the outer door.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
GAS VALVE REMOVAL/REPLACEMENT
