26
Turn off the gas at the manual shut-off valve on the gas sup-
ply pipe (Figure 3).
Drain the water heater. Refer to the section of “Draining and
Flushing” and follow the procedure.
Disconnect the igniter wire from the igniter lead wire. Use nee-
dle nose pliers to disconnect the red (+) and white (-) thermopile
wires. Disconnect the pilot tube (7/16” wrench) and manifold tube
(3/4” wrench) at the gas control valve/thermostat (Figure 22).
NOTE: L.P. Gas systems use reverse (left-hand) threads on
the manifold tube.
Refer to “Gas Piping” (Figure 3) and disconnect the ground
joint union in the gas piping. Disconnect the remaining pipe
from the gas control valve/thermostat.
To remove 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 (counterclockwise). Do not use a
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/ther-
mostat may result.
REPLACING THE GAS CONTROL VALVE/THERMOSTAT:
To replace the gas control valve/thermostat, reassemble in re-
verse 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.
Be sure to use approved Tefl on® tape or pipe joint
compound on the gas piping connections and fi tting on the back
of the gas control valve that screws into the tank.
Be sure to remove the pilot ferrule nut from the new gas control
valve/thermostat.
Turn the main gas supply on and check the gas supply connec-
tions for leaks. Correct any leak found.
Next, light the pilot and main burner, then check the manifold
tube and pilot tube connections for leaks. Correct any leak
found.
Use an approved noncorrosive leak detection solution. If such
a solution is not available, use a mixture of hand dish washing
soap and water (one part soap to 15 parts water) or childrens’
soap bubble solution. Bubbles forming indicate a leak.
Be sure tank is completely fi lled with water before lighting and
activating the water heater. Follow the “Lighting Instructions” on
page 21.
If additional information is required, reference the number on the
cover of this manual for service information.
TEFLON® is a registered trademark of E.I. Du Pont De Nemours
and Company
REMOVING THE MANIFOLD/BURNER ASSEMBLY
1. Turn the gas control/temperature knob to the “OFF” position
(Figure 22).
2. Before performing any maintenance, it is important to turn off
the gas supply to the water heater at the manual gas shut-off
valve. This valve is typically located beside the water heater.
Note the position of the shut-off valve in the open/on position,
then proceed to turn it off (Figure 3).
3. With the unit shut-off, allow suffi cient time for the water
heater to cool before performing any maintenance.
2.
3.
4.
5.
6.
IGNITER
WIRE
RED WIRE
PILOT
TUBE
MANIFOLD TUBE
IGNITER
BUTTON
IGNITER
LEAD
WIRE
WHITE
WIRE
GAS CONTROL/
TEMPERATURE KNOB
VAC
FIGURE 22
4. Remove the outer door.
5. Disconnect the following from the gas control valve/thermo-
stat: pilot tube (7/16” wrench), igniter wire (from the igniter
lead wire), and manifold tube (3/4” wrench). See Figure 22.
NOTE: L.P. Gas systems use reverse (left-hand) threads on
the manifold tube.
6. Use needle nose pliers to disconnect the thermopile wire
from the gas control valve/thermostat (Figure 22).
7. Grasp the manifold tube and push down slightly to free the
manifold tube and pilot tube.
8. Remove the screws (1/4” nut driver) securing the manifold/
burner assembly to the combustion chamber. See Figure
23.
9. Carefully remove the manifold/burner assembly from the
combustion chamber. BE SURE NOT TO DAMAGE ANY
INTERNAL PARTS.
VIEWPORT
PILOT TUBE
MANIFOLD
DOOR
MANIFOLD COMPONENT
BLOCK
MANIFOLD
TUBE
OUTER DOOR
NOT SHOWN
MANIFOLD
SCREW (2)
GAS CONTROL
VALVE/THERMOSTAT
THERMOPILE
WIRE
CONNECTIONS
GAS CONTROL/
TEMPERATURE
KNOB
PIEZO IGNITER
BUTTON
FIGURE 23
Содержание GDV
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