Temperature And Pressure Relief Valve; Maintenance Of Your Water Heater; Replacement Parts; Removing The Burner Manifold/Burner Assembly - A.O. Smith High Efficiency 100 series Installation Instructions Manual

Temperature and Pressure Relief Valve

Manually operate the temperature and pressure relief
valve at least once a year to make sure it is working

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 26).
Igniter
Wire
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.

MAINTENANCE OF YOUR WATER HEATER

STATUS
ON
OFF
LOW
VAC
Pilot
Manifold
Tube
Tube
Wiring Harness
FIGURE 26.
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 25. 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
3. Remove the outer door.
4. Remove the two screws (1/4" nut driver) securing the manifold
door assembly to the combustion chamber (Figure 27).
Gas Control Valve/
Thermostat
Pilot Tube
Viewport
FV Sensor
Manifold Screw (2)
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.
25
MANUAL RELIEF
VALVE
FIGURE 25.
Wiring
Harness
Manifold Tube
Thermal Switch
Manifold Door
Manifold Component Block
FIGURE 27.