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5773 597 - 04
Vitocrossal 200, CM2 400, 500 and 620 Installation
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.
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.
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.
The pressure relief valve must be attached to the top of
the boiler or the safety supply of the boiler, see page 15.
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
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.
All system pumps must be installed from boiler supply to
the system.
IMPORTANT
Ensure that there is no leak on any of the connections
which are covered by the insulation.
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.
WARNING
Fill only suitable water in boiler (refer to Service
instruction). Unsuitable water quality may damage boiler.
IMPORTANT
Only use antifreeze specific for hydronic heating
systems. Do not use automotive glycol!
Secure the discharge piping from the pressure relief valve
with the appropriate hangers or brackets.
IMPORTANT
The boiler should be filled and properly bled of air.
