Installation Guide

7
MAINTENANCE
WATER HEATER TEMPERATURE-PRESSURE RELIEF
VALVE
DANGER
• Burn hazard.
• Hot water discharge.
• Keep clear of Temperature-
Pressure Relief Valve
discharge outlet.
The Temperature-Pressure Relief Valve on the water heater must
be manually operated at least once a year.
When checking the Temperature-Pressure Relief Valve operation,
make sure that (1) no one is in front of or around the outlet of the
Temperature-Pressure Relief Valve discharge line, and (2) that
the water discharge will not cause any property damage, as the
water may be extremely hot. Use care when operating valve as
the valve may be hot.
To check the relief valve, lift the lever at the end of the valve
several times, see Figure 4. The valve should seat properly and
operate freely.
DISCHARGE PIPE
TEMPERATURE-PRESSURE
RELIEF VALVE
Figure 4. Testing the Temperature-Pressure Relief Valve
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. Follow the
draining instructions in the Instruction Manual that came with the
water heater.
Replace the Temperature-Pressure Relief Valve with a properly
rated/sized new one. See the Temperature-Pressure Relief Valve
instructions in the Instruction Manual that came with the water
heater for information on replacement.
WEEPING TEMPERATURE-PRESSURE
RELIEF VALVE
If the Temperature-Pressure Relief Valve on the water heater
weeps or discharges periodically, this may be due to one or more
of the following conditions:
1. The Temperature-Pressure Relief Valve may be worn or
clogged with lime/calcium accumulation and need to be
replaced. Refer to the Instruction Manual that came with the
water heater for information on replacement.
2. The inlet water pressure may be above the recommended
60 PSI. Follow the instructions in the “Adjusting Water Pressure”
section of this manual.
3. The expansion tank’s air charge pressure may not be set to
match the incoming water pressure. Follow the instructions
in the “Checking Expansion Tank Air Charge” section of
this manual.
If all the above have been checked, adjusted and/or replaced, turn
the water heater “OFF” and call the local utility.
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.
Note: Do not plug the Temperature-Pressure Relief Valve
opening. This can cause property damage, serious
injury or death.