Temperature & Pressure Relief Valve - Whirlpool Hybrid Electric Heat Pump Water Heater Manual

IMPORTANT: When making condensation connections
to the primary connection DO NOT over tighten.
Overtightening could crack or damage the condensate
drain pan.
• Plastic pipe or tubing must be used to connect the
condensate drain to a suitable drain or condensate
pump.
• Condensate drain lines should be installed in
conditioned areas only. Install approved insulation on
the condensate drain lines to prevent condensation
from forming on the outside of the drain lines.
Condensation drain lines installed in areas that are
subject to freezing temperatures should be wrapped
with a nationally recognized/listed heat tape. Install per
manufacturer's instructions.
• Do not connect condensate drain lines with other drain
or discharge lines into a single (common) pipe or line.
Each line (condensate drain line, temperature and
pressure relief valve discharge pipe, etc) should be
independently run to an adequate drain.
• Slope the condensate drain lines toward the inside
floor drain or condensate pump.
• The condensate drain lines and connections to the
drain piping must comply with all local codes.
• Use appropriate fittings, primer and glue to cement the
condensate drain lines to the heat pump drain pan.
• If a condensate pump is installed it should shut off the
heat pump in the event the condensate pump fails or
the float switch in the pump activates. (See section
on Condensate Pump Overflow Shut Off Switch in the
Electrical Requirements section.)
Closed System/Thermal Expansion
WARNING
Explosion Hazard
If the temperature and pressure relief valve
is dripping or leaking, have a qualified
person replace it.
Examples of a qualified person include:
licensed plumbers, authorized electric
company personnel, and authorized service
personnel.
Do not plug valve.
Do not remove valve.
Failure to follow these instructions can
result in death or explosion.
Most public water systems in North America are required
to prevent water flowing from points of use (residences,
businesses, etc.) back into the supply system in order
to maintain water quality. To accomplish this, back flow
preventers such as check valves, are installed in the water
line going to each point of use. Typically the back flow
preventer will be installed at the water meter or inside a
building where the supply line enters the building. This
device allows water to flow into the residence but does
not allow it to flow back into the water supply. This creates
what is known as a "Closed System". As water is heated
by the water heater, the water in the system attempts to
expand, but has nowhere to go resulting in an increase
in pressure. This increase in pressure in the system may
cause the temperature-pressure relief valve to open to
relieve the pressure. Water will drip from the temperature
and pressure relief valve. Premature tank failure will result
if this condition is not corrected. To prevent this condition, a
properly-sized thermal expansion tank should be installed
in the cold water supply to the water heater as shown in
Figure 4. Failure to install a properly sized expansion tank
in a closed system will void the warranty on the water
heater in the event of tank failure. It is important to follow
the thermal expansion tank manufacturers' installation
instructions and to adjust the expansion tank pressure
to match the water supply pressure. Contact a plumbing
service agency or your retail supplier regarding the
installation of a thermal expansion tank.
Temperature and Pressure
Relief Valve
Figure 8
Temperature and Pressure
Relief Valve Installation
Temperature and
Pressure Relief Valve
Discharge Pipe
(Do Not Plug or Cap)
Drain Pan 2 1/2"
Depth Maximum and
2" wider than the
water heater
Drain Line 3/4"
ID Minimum
Drain 6" Maximum
Air Gap
7