Typical Installation; Relief Valve - Rheem HB Duct Ready Series Use & Care Manual

Typical Installation

Ceiling
Air filter
Temperature
and pressure
relief valve and
discharge line
Primary
condensation
(3/4") to open
drain or
outdoors
A new combination temperature and pressure relief valve, complying with the Standard for Relief
Valves for Hot Water Supply Systems, ANSI Z21.22/CSA 4.4, is factory installed and must remain
in the opening provided and marked for the purpose on the water heater. No valve of any type
should be installed between the relief valve and the tank.

Relief Valve

The btu/h rating of the relief valve must
!
WARNING: The
not be less than the input rating of the
pressure rating of
water heater as indicated on the rating
the relief valve
label located on the front of the heater
must not exceed
(1 watt=3.412 btu/h).
150 PSI, the
maximum working
Connect the outlet of the relief valve
pressure of the
to a suitable open drain so that the
water heater as
discharge water cannot contact live
marked on the
electrical parts or persons and to
rating plate.
eliminate potential water damage.
Piping used should be of a type
6" Minimum clearance above heat
pump to allow for filter maintenance
Secondary condensate tubing
(3/8") to open drain or outdoors
Shut-off
valve
Drain
6" Air gap
valve
Flexible Connection
recommended
(Such as PEX)
Hot water outlet
to fixtures
Flexible Connection
recommended
(Such as PEX)
Heat trap
6" Min
Thermal expansion
tank (if required)
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.
Cold water
supply
7