Vent System - State Water Heaters 301 Series Instruction Manual

To check the relief valve, lift the lever at the end of the valve
several times, see . The valve should seat properly and
Figure 65
operate freely.
If after manually operating the valve, it fails to completely reset
and continues to release water, immediately close the cold water
inlet to the water heater and drain the water heater, see
(page 63). Replace the Temperature-Pressure
And Flushing
Relief Valve with a properly rated/sized new one, see
(page 43)
Connections Water Piping Diagrams
instructions on replacement.
TEMPERATURE-PRESSURE
RELIEF VALVE
DISCHARGE PIPE
Figure 65. T&P Relief Valve Discharge Pipe
If the Temperature-Pressure Relief Valve on the water heater
weeps or discharges periodically, this may be due to thermal
expansion.
Note: Excessive water pressure is the most common cause
of Temperature-Pressure Relief Valve leakage.
Excessive water system pressure is most often
caused by "thermal expansion" in a "closed system."
See
Thermal Expansion
(page 14). The Temperature-Pressure
Systems
Relief Valve is not intended for the constant relief of
thermal expansion.
Temperature-Pressure Relief Valve leakage due to pressure build
up in a closed system that does not have a thermal expansion tank
installed is not covered under the limited warranty. See
Water Heater Limited Warranty
Thermal expansion tanks must be installed on all closed water
systems.
DO NOT PLUG THE TEMPERATURE-PRESSURE RELIEF
VALVE OPENING. THIS CAN CAUSE PROPERTY DAMAGE,
SERIOUS INJURY OR DEATH.
Burn hazard.
Hot water discharge.
Keep clear of Temperature-
Pressure Relief Valve
discharge outlet.
Draining
Water Line
(page 69) for
(page 14) and
Closed Water
Commercial
(page 76).

VENT SYSTEM

Examine the vent system every 6 months. Points of inspection
are as follows:
1. Check for obstructions and/or deterioration of the intake air and/
or vent piping and the intake air and vent terminations. Replace
immediately where needed.
2. The debris screens in the intake air and vent terminations
should be cleaned of foreign material and soot. See
(page 27).
Note: Do not reach inside the vent termination when the
heater is in operation.
3. Check all vent system connections for leakage and repair or
reseal as necessary.
4. Inspect and clean the built-in condensate trap of any debris.
See (page 16) and
Figure 8
65
Explosion Hazard
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.
Figure 25
(page 39).
Figure 53