Viessmann VITOCAL 242-S Installation And Service Instructions Manual page 51

Electrical connection
D Fuses and contactor for circulation
pump for swimming pool heating
(accessories)
E Jumper
F 3-way diverter valve for "Swimming
pool" (zero volt: heating the heating
water buffer cylinder)
Internal unit: AVI PCB
Interface internal unit – external unit
Plug Component
F101 Fuse 1.0 A (slow L)
P202 BUS connection (12 V to external unit for type AWT-AC 241.A10,
A13, B10, B13)
P203 BUS connection (43 V to external unit for type AWT-AC 241.A04,
A07)
Note
■ Only one BUS connection should be
connected.
■ Do not interchange the BUS connec-
tion wires between the internal and
external units.
■ Route the BUS connecting cable in the
230 V~ voltage area.
(cont.)
G Circulation pump for swimming pool
heating (accessory)
H Thermostat for swimming pool tem-
perature control (floating contact:
230 V~, 0.1 A, accessories)
K Connection on controller and sensor
PCB
Installation sequence
51