Univex 318258-000 ユーザーズマニュアル

7

To reduce the risk of excessive pressures and temperatures 
in this water heater, install temperature and pressure relief 
protective equipment required by local codes, but no less 
than a combination temperature and pressure relief valve 
certifi ed 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 Shutoff Devices for Hot Water 
Supply Systems, ANSI Z21.22 - latest edition. This valve 
must be marked with the maximum set pressure not to 
exceed the marked maximum working pressure of the 
water heater. Install the valve into an opening provided 
and marked for this purpose in the water heater, and orient 
it or provide tubing so that any discharge from the valve 
exits only within 6 inches above drain, or at any distance 
below, the structural fl oor, and does not contact any live 
electrical part. The discharge opening must not be blocked 
or reduced in size under any circumstance. 

  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.
The Temperature & Pressure Relief Valve:   

• 

Shall not be in contact with any electrical part.

• 

Shall be connected to an adequate discharge line.

• 

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

The Discharge Line:
• 

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

• 

Shall not be capped, blocked, plugged or contain    
any valve between the relief valve and the end of the 
discharge line.

• 

Shall terminate a maximum of six inches above a floor 
drain or external to the building. In cold climates, it is 
recommended that the discharge pipe be terminated at 
an adequate drain inside the building.

• 

Shall be of material listed for hot water distribution.

• 

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

Locate the temperature and pressure relief valve on the 

1. 

water heater (also known as a T&P relief valve). See 

Figure 5.
Locate the slit running the length of the T&P relief valve 

2. 

insulation.
Spread the slit open and fi t the insulation over the T&P 

3. 

relief valve. See Figure 6. Apply gentle pressure to the 

insulation to ensure that it is fully seated on the T&P Re-

lief Valve. Once seated, secure the insulation with duct 

tape, electrical tape, or equivalent. 

 The insulation and tape must not block 

the discharge opening or hinder access to the manual 

relief lever (Figure 6). Ensure a discharge pipe is in-

stalled into the T&P valve discharge opening per the 

instructions in this manual.

6” Maximum 
Air Gap

Drain Pan 2 1/2” 
Depth Maximum and
2 Inches wider than
the water heater.

Discharge Pipe
(Do Not Plug or Cap)

Temperature and 
Pressure Relief Valve

Drain Line 3/4” 
ID Minimum

Drain

Figure 5
Temperature and Pressure 
Relief Valve Installation 

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 5).