3.5 Water connections
In order to safeguard the heat exchanger
and circulation pump, especially in case
of water heater replacement, it is
recommended that the system is hot-
flushed to remove any impurities
(especially oil and grease) from the pipes
and radiators.
Make sure that the domestic water and
central heating pipes are not used to
ground the electrical system. The pipes
are totally unsuitable for this purpose.
Isolation Valves must be installed on the
heating and D.H.W circuits. This will
facilitate all maintenance and service
operations where the water heater needs
to be drained.
■ To prevent vibration and noise coming from
the system, do not use pipes of reduced
diameter, short radius elbows or severe
reductions in the cross sections of the water
passages.
In order to guarantee the reliability of the
water heater and prevent permanent damage
in areas with high water inlet pressure too, a
36.3 psi (2.5 bar) pressure reducing valve
should be fitted.
■ The water flowing out of the pressure/relief
valve during its operation may be extremely
hot. Before operating relief valve, make sure
drain line is installed to direct discharge to a
safe location such as an open drain. Avoid
scalding and/or water damage.
A pressure relief valve is installed in this dual purpose water heater that is rated in accordance with and complying
with either The Standard for relief Valves and Automatic Shutoff Devices for Hot Water Supply Systems, ANSI
Z21.22 CSA 4.4 Code.
The relief valve must be installed such that the discharge will be conducted to a suitable place for disposal when
relief occurs and that no reducing coupling or other restriction be installed in the discharge line. The discharge line
must be installed to allow complete drainage of both the valve and the line. If this unit is installed with a separate
storage vessel, the separate vessel must have its own temperature and pressure relief valve. No valve is to be
placed between the relief valve and the tank. This valve must also comply with The Standard for Relief Valves and
Automatic Shutoff Devices for Hot Water Supply Systems. ANSI Z21.22 or CSA 4.4. If a relief valve discharges
periodically, this may be due to the thermal expansion in a closed water system.
Contact the water supplier or local plumbing inspector on how to correct this situation. Do not unplug relief valve.
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