Whirlpool W10100870 사용자 설명서

13

Periodic discharge of the temperature and pressure relief 
valve may be due to thermal expansion in a closed water 
supply system. The water utility supply meter may contain a 
check valve, backflow preventer or water pressure reducing 
valve. This will create a closed water system. During 
the heating cycle of the water heater, the water expands 
causing pressure inside the water heater to increase. This 
may cause the temperature and pressure relief valve to 
discharge small quantities of hot water. To prevent this, it 
is recommended that a diaphragm-type expansion tank 
(suitable for potable water) be installed on the cold water 
supply line. The expansion tank must have a minimum 
capacity of 1.5 U.S. gallons for every 50 gallons of stored 
water. Contact the local water supplier or plumbing 
inspector for information on other methods to control this 
situation. 

IMPORTANT: Do not plug or remove the temperature and 
pressure relief valve.

Drain Pan

Drain

6” Maximum

Discharge line 3/4” maximum
Do not cap or plug

Temperature and
Pressure Relief Valve

Figure 15A
Temperature and Pressure
Relief Valve Installation

Optional location
some models only

For protection against excessive pressures and 
temperatures, a temperature and pressure relief valve must 
be installed in the opening marked “T & P RELIEF VALVE” 
(see Figure 15A). This valve must be design certified by 
a nationally recognized testing laboratory that maintains 
periodic inspection of the production of listed equipment or 
materials as meeting the requirements for Relief Valves and 
Automatic Shut-off Devices for Hot Water Supply Systems, 
ANSI Z21.22. The function of the temperature and pressure 
relief valve is to discharge water in large quantities in the 
event of excessive temperature or pressure developing 
in the water heater. The valve’s relief pressure must not 
exceed the working pressure of the water heater as stated 
on the data plate.

IMPORTANT: Only a new temperature and pressure relief 
valve should be used with your water heater. Do not use an 
old or existing valve as it may be damaged or not adequate 
for the working pressure of the new water heater. Do not 
place any valve between the relief valve and the tank.

• 

Must not be in contact with any electrical part.

• 

Must be connected to an adequate discharge line.

• 

Must not be rated higher than the working pressure 
shown on the data plate of the water heater.

The Discharge Line: 

• 

Must not be smaller than the pipe size of the relief 
valve or have any reducing coupling installed in the 
discharge line.

• 

Must not be capped, blocked, plugged or contain any 
valve between the relief valve and the end of the dis-
charge line.

• 

Must terminate a maximum of six inches above a floor 
drain or external to the building.

• 

Must be capable of withstanding 250°F (121°C) without 
distortion.

• 

Must be installed to allow complete drainage of both 
the valve and discharge line.