Filling The Dhw Cylinder On The Dhw Side; Switching On The Power Supply And The On/Off Switch; Selecting The Language - Only For Weather-Compensated Control Units - Viessmann Vitodens 222-F Installation And Service Instructions For Contractors

Filling the heating system
4. Fill the heating system via boiler drain & fill valve
A in the heating return (depending on the connec-
tion set either on the side or above the boiler). Mini-
mum system pressure > 1.0 bar (0.1 MPa).
Note
If the control unit was not switched on prior to filling
the system, then the servomotor of the diverter
valve will still be in its central position and the sys-
tem will be completely filled.
Activating the filling function
Weather-compensated control unit
Service menu
1. Press OK and simultaneously for approx. 4 s.
å
2. "Service functions"
3. "Filling"
Filling function is enabled.
4. Ending filling function:
Press OK or .
ä

Filling the DHW cylinder on the DHW side

Fig. 18

Switching on the power supply and the ON/OFF switch

Selecting the language - only for weather-compensated control units

At the commissioning stage, the display is in German
(factory setting).
Commissioning, inspection, maintenance
(cont.)
5. If the control unit was already on before filling
began:
Switch the control unit ON and activate the fill pro-
gram (see next chapter).
Note
For function and details of the fill program, see
page 128.
6. Close boiler drain & fill valve
Constant temperature control unit
Service menu
1. Press OK and
2. Select " " and confirm with OK.
4
"ON" flashes.
3. Activate the filling function with OK.
"bF on" is shown constantly.
4. Ending filling function:
Press .
ä
1. The lever on valve
2. Open the on-site DHW supply and a DHW draw-off
point.
3. Once air stops coming out of the DHW draw-off
point, the DHW cylinder is completely filled.
Extended menu:
1.
å
2. "Einstellungen"
.
A
simultaneously for approx. 4 s.
å
must be in the "left" position.
B
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