Initial System Fill - Viessmann Vitocrossal 200 CM2 Series Installation Instructions Manual

Boiler

Initial System Fill

Treatment of boiler feed water should be considered in
areas of known problems, such as high mineral content
and hardness. In areas where freezing might occur, an
antifreeze may be added to the system water to protect
the system (maximum mix ratio - 50% / 50%). Please
adhere to the specifications given by the antifreeze
manufacturer for hydronic heating systems.
IMPORTANT
Only use antifreeze specific for hydronic heating
systems. Do not use automotive glycol!
Please observe that an antifreeze/water mixture may
require a backflow preventer within the automatic water
feed and influence components such as diaphragm
expansion tanks, radiation etc. A 40% antifreeze content
will provide freeze-up protection to -31°F (-25°C).
The heating system may also contain components which
may be negatively affected by antifreeze. Check entire
system frequently when filled with antifreeze. Read boiler
service instructions for further information on water
quality.
CAUTION
Before the heating boiler is installed and piped into an
existing system, the heating system itself must be
properly flushed to remove dirt and system sludge.
Accumulations in old heating systems will tend to settle
in the boiler and can lead to deposits which can cause
hot spots, noise and water-side corrosion. For damages
resulting from those kinds of impurities, the warranty
will be null and void.
The Vitocrossal 200 boiler is only suitable for closed hot
water heating systems with pumps.
It is strongly recommended to install boiler isolation
valves and above these isolation valves, drain valves in
the system supply and return. With this installed, any
maintenance work on the boiler or heating system,
will not require draining the entire system.
When the boiler is utilized to supply heat to an indirectly
heated domestic hot water tank, it is necessary that the
heating loops (without a mixing valve) are equipped with
flow check valves on the discharge side of the pumps to
avoid reverse flow.
IMPORTANT
All system pumps must be installed from boiler supply to
the system.
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Vitocrossal 200 CM2 Installation Instructions
The pressure relief valve must be attached to the top of
the boiler or the safety supply of the boiler, see page 13.
No valve, shut-off device or obstruction of any kind and
no construction must be used between boiler and relief
valve or on the discharge side of the pressure relief valve.
The discharge side of the pressure relief valve must
continue in the same size as the outlet horizontally over
the side of the boiler, and then vertically downwards to
end approximately 1 ft. (300 mm) above the floor, and
piped as close to a floor drain as possible. Do not install
this discharge pipe to the outdoors or any area where
freezing might occur or the discharge pipe could endanger
life and equipment.
IMPORTANT
Secure the discharge piping from the pressure relief valve
with the appropriate hangers or brackets.
The boiler should be filled and properly bled of air.
All openings, as well as pipe connections on the boiler,
should be observed for possible leaks. Once all
connections are tight, the insulation can be mounted.
IMPORTANT
Cold water fill pressure must equal expansion tank pressure.
The boiler should be filled and properly bled of air and
the cold water fill pressure should not exceed 18-20 psig.
All openings, as well as pipe connections on the boiler,
should be observed for possible leaks. Once all
connections are tight, the insulation can be mounted.
IMPORTANT
Ensure that there is no leak on any of the connections
which are covered by the insulation.
WARNING
Fill only suitable water in boiler (refer to Service
instruction). Unsuitable water quality may damage boiler.