Fill Heating System With Water - Viessmann VITODENS 200-W Service Instructions Manual

Vitodens 200-W B2HA 112, 150 Service

Fill Heating System with Water

Legend
BD Boiler Drain
BF Boiler Fill
BR Boiler Return
BS Boiler Supply
GC Gas Connection
PRV Pressure Relief Valve
CAUTION
Unsuitable fill water increases the level of deposits and
corrosion, and may lead to damage to the equipment.
H Thoroughly flush the entire heating system prior to
filling with water.
H Only use water of potable quality.
H The water will have to be softened if it is harder than
8.77 grains / 150 ppm total dissolved solids.
H Inhibitors or antifreeze additives suitable for heating
systems may be added manually.
1. Open system isolation valves at C and D (if
installed).
Note: Before filling the heating system with water,
check that all necessary flow check valves are
installed.
2. Check inlet pressure of the diaphragm expansion tank.
Note: 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
approximately 60ºF (15.6ºC).
3. To remove debris and/or sludge ensure that the
system piping is flushed out. Failure to do so could
cause settlement in the boiler causing overheating
and damage not covered by warranty.
Note: System fill pressure must be approximately
3 psig higher than the static head when the
system is cold.
4. Fill the heating system with water at the boiler fill (BF)
and drain air completely from the boiler drain (BD).
Note: 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.
5. Bleeding the heating system
1. Close the gas shut-off valve and switch the
control unit ON.
2. Activate venting program (see next steps).
Note: During the venting program, the circulation
pump will be alternately switched ON and
OFF for 30 seconds respectively over a
period of 20 minutes. The burner is
switched OFF during the venting program.
3. Check the system pressure.
Activating filling (bleeding) program:
1. Press OK and
4 seconds.
2. "Service functions"
3. "Filling"
4. Ending filling function: Press OK
Maximum operating pressure...80 psig
Minimum operating pressure...14 to 23 psig
Pressure relief valve...............80 psig
Start-up and Service
simultaneously for approximately
or .
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