Instructions for installation (cont'd), Temperature-pressure relief valve, Awarning – Maytag HE21250PC User Manual
Page 11: Temperature-pressure rehef valve
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Instructions for Installation (cont'd)
Temperature-Pressure Relief Valve
At the time of manufacture this water heater was provid
ed with a combination temperature-pressures relief valve
certified by a nationally recognized testing laboratory that
maintains periodic inspection of production of listed
equipment or materials, as meeting the requirements for
Relief Valves and Automatic Gas Shutoff Devices for Hot
Water Supply Systems, and the latest edition of ANSI
Z21.22 and the code requirements of ASME. If replaced,
the valve must meet the requirements of local codes, but
not less than a combination temperature and pressure
relief valve certified as meeting the requirements for
Relief Valves and Automatic Gas Shutoff Devices for Hot
Water Supply Systems, ANSI Z21.22 by a nationally recog
nized testing laboratory that maintains periodic inspection
of production of listed equipment or materials.
The valve must be marked with a maximum set pressure
not to exceed the marked hydrostatic working pressure of
the water heater (150 Ibs./sq. in.} and a discharge capacity
not less than the water heater input rate as shown on the
model rating plate. (Electric heaters - watts divided by
1000 X 3415 equal BTU/Hr. rate.)
Your local jurisdictional authority, while mandating the
use of a temperature-pressure relief valve complying with
ANSI Z21.22 and ASME, may require a valve model differ
ent from the one furnished with the water heater.
Compliance with such local requirements must be satisfied
by the installer or end user of the water heater with a
locally prescribed temperature-pressure relief valve
installed in the designated opening in the water heater in
place of the factory furnished valve.
For safe operation of the water heater, the relief valve
must not be removed from it's designated opening or
The temperature-pressure relief valve must be installed
directly into the fitting of the water heater designated for
the relief valve. Position the valve downward and provide
tubing so that any discharge will exit only within 6 inches
above, or at any distance below the structural floor. Be
certain that no contact is made with any live electrical
part. The discharge opening must not be blocked or
reduced in size under any circumstances. Excessive length,
over 30 feet, or use of more than four elbows can cause
restriction and reduce the discharge capacity of the valve.
No valve or other obstruction is to be placed between the
relief valve and the tank. Do not connect tubing directly to
discharge drain unless a 6” air gap is provided. To prevent
bodily Injury, hazard to life, or property damage, the relief
valve must be allowed to discharge water in quantities
should circumstances demand. If the discharge pipe is not
connected to a drain or other suitable means, the water
flow may cause property damage.
The Discharge Pipe:
• Must not be smaller in size than the outlet pipe size of
the valve, or have any reducing couplings or other
• Must not be plugged or blocked.
• Must be of material listed for hot water distribution.
• Must be installed so as to allow complete drainage of
both the temperature-pressure relief valve, and the dis
• Must terminate at an adequate drain.
• Must not have any valve between the relief valve and
The temperature-pressure relief valve must be manu
ally operated at least once a year. Caution should be
taken to ensure that (1) no one is in front of or
around the outlet of the temperature-pressure relief
valve discharge line, and (2) the water manually dis
charged will not cause any bodily injury or property
damage because the water may be extremely hot.
If after manually operating the valve, it fails to com
pletely reset and continues to release water, immedi
ately close the cold water inlet to the water heater,
follow the draining instructions, and replace the
temperature-pressure relief valve with a new one.
(Do not cap or plug)
“RELIEF VALVE OPENING
This water heater is provided with a combination Tempefalure-PresSLire Relief Valve listed as complying with
the standard for Reliet Valves and Automatic Gas Shutoff Devices for Hot l/Vater Supply Systems, ANS .22
and the code rei^irements of ASME.
Your local jurisdictionai authority, while mandating the use ot a Temperature-Pressure Relief Valve complying
with ANS Z21-22 and ASME, may require a valve model different from the one furnished with the water twater
Compliance with such local requirements must be satisfied by the installer or end user of the water heater with
a locally prescribed Temperature-Pressure Relief Valve ir^stalled in the designated opening in the water
(IV.' X V.
• If a short shank (less than 2‘j temperature-pressure relief valve Is to be installed
(as stwFiTr). a rMpplo and coupting rrtusl be used.
• If a long shank (2" or longer} is to be installed, do not use the nipple and coupling.
"Install Temperature-Pressure protective equipment required by local codes, but not less than a combina
tion Temperature-Pressure Relief Valve certified as meeting the requirements for Relief Valves and
Automatic Gas Shutoff Devices for Mot-Water Supply Systems, MS Z21.22 by a nationally recognized test
ing laboratory that maintains periodic inspection of production of Hated equipment or materials. The valve
must be oriented, provided with tubing, or otherwise installed so that discharge carr exit only wHhir 6 inches
above, or at any distance below ti>e stiuctural floor, and cannot contact any live eledricaf part.''
For safe operatron of the water heater, the Relief Valve must not be removed or plugged.
See manual heading - Temperature-Pressure Relief Valve" lor installation and maintenance of Relief
Valve, discharge pipe and other safety precautions.