Inspection. Inspect the gage and the
i. Water Heater Burner Solenoid Valve.
dampener for damaged threads, and the gage for
(1) Description. The burner solenoid valve
broken or scratched glass, illegible markings, and
(7, fig. 4-32) is located behind the water heater control
panel box. It is automatic and is controlled by the
(4) Installation. Replace defective gage and
pressure and temperature control. Refer to e and f
dampener with serviceable ones, and install them by
above. It regulates the flow of fuel to the burner nozzle.
reversing the procedure in j (2) above. Make certain the
When water is supplied to the heater, it creates a
gage dial faces the front of the water heater.
pressure, which closes the switch in the pressure and
temperature control and energizes the solenoid valve. If
k. Water Heater Temperature Gage, Bracket, and
the temperature of the shower water rises above 120
F., the switch in the pressure and temperature control
breaks contact and de-energizes the solenoid valve,
which stops the flow of fuel to the burner. When the
gage is mounted on the gage bracket on
temperature of the shower water drops to 95 F., the
control panel box.
It indicates the
switch in the pressure and temperature control closes
of the water being supplied to the shower
and energizes the solenoid valve, and allows fuel to flow
to the burner.
(a) Remove the six screws (1, fig. 4-
remove the sensing bulb from the bushing (3), and
22) that hold the control panel box cover (5)
unscrew and remove the bushing from the manifold.
control panel box (4), and remove the cover and gasket
from the box.
(b) Remove the sensing tube (5) from
(b) Loosen the two screws that hold the
the retaining clips (2) on the water heater.
pressure and temperature control cover to the pressure
and temperature control (12), and remove the cover
(c) Remove the six screws that hold the
from the control.
cover (5, fig. 4-22) to the control panel box, and
(c) Disconnect the valve wire from the
remove the cover and gasket from the box.
wire terminal screw (5, fig. 4-32) in the pressure and
(d) Remove the nuts and the screws
that attach the temperature gage bracket to the panel
(d) Disconnect the other valve wire in
control box (4).
the control panel box by unscrewing the wire nut.
(e) Unscrew and remove the box
(e) Remove the bracket with the
connector from the solenoid valve (7).
temperature gage (2) from the control panel box.
(f) Disconnect the pipe fittings at both
(f) Remove the two nuts that hold the
sides of the solenoid valve, and remove the valve from
bracket to the gage to separate the bracket from the
the fuel line.
(3) Inspection. Check the valve for open
(3) Inspection. Inspect the gage for broken or
scratched glass, broken hand, and illegible markings.
(4) Installation. Replace defective valve with
Inspect for broken and leaking sensing tube and bulb.
a serviceable valve, and install it by reversing the
Inspect for bent and broken bracket, and check for
procedure in i (2) above.
stripped or damaged threads on the bushing.
(4) Installation. Replace defective items with
j. Water Heater Fuel Pump Pressure Gage and
serviceable ones, and install them by reversing the
procedure in k (2) above.
(1) Description. The pressure gage is located
I. Burner Fuel Control Valve or Burner Fuel
behind the control panel box. It registers in pounds per
square inch the pressure of the fuel being supplied to
(1) Description. The burner fuel control valve
is located above the water heater control panel box. It
is used to adjust the flow of fuel to the burner thus
(a) Unscrew and remove the fuel pump
controlling the temperature of the shower water. The
pressure gage (3, fig. 4-22) from the fluid pressure
burner fuel shutoff valve is located behind the pressure
and temperature control on the water heater. It is used
to start and to stop the flow of fuel to the burner. The
(b) Unscrew and remove the dampener
following instruction in this paragraph applies either to
from the pipe tee.
the control valve or the shutoff valve.