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Vitocell 100-VH/-BH Installation/Operation/Service
Connections
Water connections
Note: Before proceeding with the installation, close the
main water supply valve. After shutting the main
water supply valve, open a faucet to relieve the
water line pressure to prevent any water from
leaking out of the pipes while making the water
connections to the water heater/storage unit.
After the pressure has been relieved, close the
faucet. Make the proper plumbing connections
between the water heater/storage unit and the
plumbing system in the house. Install a shutoff
valve in the cold water supply line.
CAUTION
If sweat fittings are to be used, DO NOT apply heat to
the nipples of the water heater/storage unit. Sweat the
tubing to the adapter before fitting the adapter to the
water connections. It is imperative that heat is not
applied to the nipples containing a plastic liner.
If this water heater/storage unit is installed in a closed
water supply system, such as the one having a back-flow
preventer in the cold water supply, provisions shall be
made to control thermal expansion. DO NOT operate this
water heater/storage unit in a closed system without
provisions for controlling thermal expansion. Your water
supplier or local plumbing inspector should be contacted
on how to control this situation.
After installation of the water lines, open the main water
supply valve and fill the water heater/storage unit. While
the water heater/storage unit is filling, open several hot
water faucets to allow air to escape from the water
system. When a steady stream of water flows through
the faucets, close them and check all water connections
for possible leaks.
Never operate the water heater/storage unit without first
being certain it is filled with water.
Temperature and pressure relive valve (T&P)
For protection against excessive temperatures and
pressure, install temperature and pressure protective
equipment required by local codes, but not less than
a combination temperature and pressure 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, ANSI Z21.22, and the Standard
CAN1-4.4 Temperature, Pressure, Temperature and
Pressure Relief Valves and Vacuum Relief Valves.
The combination temperature and pressure relief valve
shall be marked with a maximum set pressure, not to
exceed the maximum working pressure of the water
heater/ storage unit. The combination temperature and
pressure relief valve shall also have an hourly rated
temperature steam BTU discharge capacity not less than
the hourly input rating of the water heater/storage unit.
Install the combination temperature and pressure relief
valve into the opening provided and marked for this
purpose on the water heater/storage unit.
Note: Some models may already be equipped or supplied
with a combination temperature and pressure relief
valve. Verify that the combination temperature and
pressure relief valve complies with local codes.
If the combination temperature and pressure relief
valve does not comply with local codes, replace
it with one that does. Follow the installation
instructions above on this page.
Install a discharge line so that water discharged from the
combination temperature and pressure relief valve will exit
within 6 in. above or any distance below the structural
floor and cannot contact any live electrical part.
The discharge line is to be installed to allow for complete
drainage of both the temperature and pressure relief valve
and the discharge line. The discharge opening must not
be subjected to blockage or freezing.
DO NOT thread, plug or cap the discharge line. It is
recommended that a minimum of 4 in. (10.2 cm) be
provided on the side of the water heater/storage unit
for servicing and maintenance of the combination
temperature and pressure relief valve.
DO NOT place a valve between the combination
temperature and pressure relief valve and the tank.
Installation
9
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