Fill Heating System With Water - Viessmann VITODENS 200 Start-Up/Service Instructions

Vitodens 200 WB2 Service

Fill Heating System with Water

1. Open system isolation valves (if installed).
2. Check inlet pressure of the diaphragm expansion
3. To remove debris and/or sludge ensure that the
4. Optional:
Air vent
Water treatment should be considered in areas where it
is known that boiler feed water contains a high mineral
content and hardness. In areas where freezing might
occur, an antifreeze may be added to the system water
to protect the system.
Please adhere to the specifications given by the antifreeze
manufacturer. Do not use automotive silicate-based
antifreeze. 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 -10°F/-23°C.
Do not use antifreeze other than specifically made for
hot water heating systems. System also may contain
components which might be negatively affected by
antifreeze.
Check total system frequently when filled with antifreeze.
Note: Before filling the heating system with water,
check that all necessary flow check valves are
installed.
tank. If the nitrogen pressure of the precharged
expansion tank is less than the static pressure of
the system, inflate membrane pressure to slightly
exceed pressure of system.
The static pressure required at the tank is based
upon the static height of the system. The system
fill pressure value must be equal to the expansion
tank pressure value at approx. 60ºF/15.6ºC.
system piping is flushed out. Failure to do so could
cause settlement in the boiler causing overheating
and damage not covered by warranty.
System fill pressure must be approximately 3 psig
higher than the static head when the system is cold.
Fill the heating system with water at the boiler filling
and drain tap A and drain air completely from the
system at manual air bleed valve B (use supplied key)
as per the Vitodens 200 Installation Instructions.
Max. boiler operating pressure ......45 psig
Min. boiler operating pressure .......12 psig
Pressure relief valve ....................30 psig
Start-up and Service
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