Rheem HB Series - Relief Valve Installation

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
8" Minimum clearance above heat
pump to allow air circulation
Electrical access cover
Ceiling
Heatpumplter
Union
Drain valve
Union
Hot water outlet
toxtures
Temperature and pressure
relief valve and discharge
line
Shut off valve
Cold water
supply
Thermal expansion
tank (if required)
6" Air gap
Heat trap
6" Min
Primary condensation (3/4")
to open drain or outdoors
Secondary condensate tubing
(1/2") to open drain or outdoors