Rheem AP15121-1 User Manual download pdf (Page 7)

WARNING: The pressure

rating of the relief valve must

not exceed 150 PSI, the

maximum working pressure of

the water heater as marked on

the rating plate.

A new combination temperature and pressure relief valve, complying with the Standard for Relief Valves and

Automatic Gas Shut-Off Devices for Hot Water Supply Systems, ANSI Z21.22/CSA 4.4, is installed in the

opening provided. No valve of any type should be installed between the relief valve and the tank. Local codes

shall govern the installation of relief valves.

Relief Valve

The BTUH rating of the relief valve

must not be less than the input rating

of the water heater as indicated on the

rating label located on the front of the

heater (1 watt=3.412 BTUH).

Connect the outlet of the relief valve

to a suitable open drain so that the

discharge water cannot contact live

electrical parts or persons and to

eliminate potential water damage.

Piping used should be of a type

approved for hot water distribution.

The discharge line must be no smaller

than the outlet of the valve and must

pitch downward from the valve to

allow complete drainage (by gravity)

of the relief valve and discharge line.

The end of the discharge line should

not be threaded or concealed and

should be protected from freezing.

No valve of any type, restriction or

reducer coupling should be installed in

the discharge line.

Typical Installation

Electrical Access for

Hook-up

Hot water outlet to xtures

Cold Water Supply

Drain Valve

Temperature and Pressure Relief

Valve and discharge line

Union

Heat Pump Filter

Access Door to

Temperature Control

Shut Off Valve

6" Air Gap

Thermal Expansion

Tank (if required)

8" Minimum Clearance above Heat

Pump to allow air circulation

Ceiling in Alcove

Primary Condensate line (3/4")

to open drain or outdoors

Heat Trap

6" Min.

Secondary Condensate tubing

(1/2") to open drain or outdoors

1 2 3 4 5 6 7 8 9 10 11 12 ... 19 20

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Rheem AP15121-1 User Manual Page 7

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