Checking The Expansion Vessel And Heating Circuit Pressure; Checking The Indoor Unit Electrical Connections For Firm Seating; Checking That The Fan In The Outdoor Unit Can Run Freely - Viessmann Vitocal 200-S Installation And Service Instructions Manual

Filling and venting the secondary side
02. Check the pre-charge pressure of the expansion
vessel. Adjust pre-charge pressure to system con-
ditions where necessary.
03. Fill (flush) and vent the secondary circuit via an
on-site connection.
!
Please note
Leaking hydraulic connections lead to appli-
ance damage.
■ Check the internal and on-site hydraulic
connections for leaks.
In the event of leaks, switch off the appli-
■
ance immediately. Drain off liquid via the
drain valve. Check the seating of seal
rings. Always replace displaced seal
rings.
04. Check the system pressure at the pressure gauge.
Top up with water if required.
Minimum system pressure:
■
0.8 bar (80 kPa)
■ Permissible operating pressure:
3.0 bar (0.3 MPa)

Checking the expansion vessel and heating circuit pressure

Observe engineering information.
Heat pump technical guide

Checking the indoor unit electrical connections for firm seating

Checking that the fan in the outdoor unit can run freely

Danger
Contact with the fans while they are operating
can result in serious cutting injuries.
Isolate the outdoor unit from the power supply.
■
Safeguard against unauthorised reconnection.
Do not open the appliance until the fan has
■
come to a stop.
Commissioning, inspection, maintenance
(cont.)
05. Move the control unit panel into the service posi-
tion.
06. Open the programming unit.
07. Connect the on-site hose to secondary circuit air
vent valve .
B
!
Please note
Escaping liquids can lead to electrical
defects.
Protect electrical components from escap-
ing liquids.
08. Open secondary circuit air vent valve
09. Turn 3-way diverter valve
Press D . Lock to "MAN" setting by turning to the
left. Move lever to a vertical position.
C
10. Close secondary circuit air vent valve
11. Turn the 3-way diverter valve clockwise to the
"AUTO" position.
.
B
to central position:
A
.
B
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