External Unit: Overview Of Connections - Viessmann VITOCAL 222-S Installation And Service Instructions Manual

Electrical connection
Plug Component
F101 Fuse 1.0 A (slow L)
P202 BUS connection (12 V to external unit for type AWT/AWT-AC 221.A10/A13, 221.B10 to
B16)
P203 BUS connection (43 V to external unit for type AWT/AWT-AC 221.A04 to A07)
Note
Only one BUS connection should be connected.
■
Do not interchange the BUS connection wires
■
between the internal and external units.
■ Route the BUS connecting cable in the 230 V~ volt-
age area.

External unit: Overview of connections

Opening external unit wiring chamber
Type AWT/AWT-AC
221.A04
A
Fig. 31
Wiring chamber:
A
■ BUS connection to the internal unit
Note
Do not interchange the BUS connection wires
between the internal and external units.
■ Compressor power supply
(cont.)
221.A05/A07
A
Fig. 32
Installation sequence
221.A10/A13/B10/B13/B16
A
Fig. 33
39