John Wood Atmospheric Gas (ENERGY STAR) - NEW - Manuel (Page 24)

24
Temperature and Pressure Relief Valve
Explosion Harzard
• Temperature-pressure relief
valve must comply with ANSI
Z21.22-CSA 4.4 and ASME
code.
• Properly sized temperature-
pressure relief valve must be
installed in opening provided.
• Can result in overheating
and excessive tank pressure.
• Can cause serious injury or
death.
Manually operate the temperature and pressure relief
valve at least once a year to make sure it is working
properly. To prevent water damage, the valve must be
properly connected to a discharge line which terminates at
an adequate drain. Standing clear of the outlet (discharged
water may be hot), slowly lift and release the lever handle
on the temperature and pressure relief valve to allow the
valve to operate freely and return to its closed position.
See Figure 22. If the valve fails to completely reset and
continues to release water, immediately shut off the
manual gas control valve and the cold water inlet valve
and call a qualified technician.
TEMPERATURE AND PRESSURE
RELIEF VALVE
DISCHARGE LINE TO DRAIN
MANUAL RELIEF
VALVE
FIGURE 22.
Replacement Parts
IMPORTANT: The following maintenance procedures are
for the FVIR System components and should be performed
by a qualified technician.
Replacement parts may be ordered through your plumber
or the local distributor. Parts will be shipped at prevailing
prices and billed accordingly. When ordering replacement
parts, always have the following information ready:
1. model, serial, and product number
2. type of gas
3. item number
4. parts description
See Repair Parts Section for a list of available repair parts.
Removing the Manifold/Burner Assembly
1. Turn off the gas to the water heater at the manual
shut-off valve (Figure 5).
2. Move the ON/OFF switch on the gas control valve/
thermostat to the “OFF” position to turn off the water
heater. (Figure 23).
Pilot
Tube
Manifold
Tube
Igniter
Wire
Wiring Harness
ON
OFF
STATUS
A
B C
• •
VE RY
HOT
HOT
LOW VAC
FIGURE 23.
MAINTENANCE OF YOUR WATER HEATER
3. Remove the outer door.
4. Remove the two screws (1/4” nut driver) securing the manifold
door assembly to the combustion chamber (Figure 24).
Manifold Screw (2)
Manifold Component Block
Manifold Door
Thermal Switch
Pilot Tube
Manifold Tube Viewport
Wiring
Harness
Gas Control Valve/
Thermostat
FV Sensor
FIGURE 24.
5. Disconnect the pilot tube (7/16” wrench), the igniter
wire, and manifold tube (3/4” wrench) at the gas
control valve/thermostat. Also use needle nose pliers
to disconnect the yellow TCO wire leads from the
thermal switch on the manifold door. NOTE: L.P.
Gas systems use reverse (left-hand) threads on the
manifold tube.
6. Grasp the manifold tube and push down slightly to free
the manifold and pilot tube.
7. Carefully remove the manifold assembly from the
burner compartment.
NOTE: Be sure not to damage internal parts.