Filling The Heating System - Viessmann VITODENS 222-F Service Instructions Manual

Vitodens 222-F B2TA 19 and 35 Service

Filling the Heating System

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
17.5 grains / 300 ppm total dissolved solids.
H Inhibitors or antifreeze additives suitable for heating
systems may be added manually.
1. Check the pre-charge pressure of the diaphragm
expansion vessel.
2. Close the gas shut-off valve.
3. Fill heating system via boiler drain & fill valve A
in the heating return (at the connection set on the
side or above the boiler). Minimum system pressure
> 14 psi.
Note: If the control unit has not been switched on
prior to filling the system, then the servomotor
of the diverter valve will still be in its central
position, and the system will be completely
filled.
Note: Lever on valve B must be in the "left"
position.
4. If the control unit had already been switched on
before filling began: Switch control unit ON and
activate filling program (see next steps).
5. Close boiler drain C & open fill valve A.
Activating filling (bleeding) program:
1. Press OK and
4 seconds.
2. "Service functions"
3. "Filling"
4. Ending filling function: Press OK or
Start-up
simultaneously for approximately
.
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