Viessmann Vitoligno 300-H Installation And Service Instructions For Contractors page 147

PCB HKK 2.01
(cont.)
Fig. 91
s-Ö *6 Connection to ZPK and KSK PCBs
HC 1: Pump, heating circuit 1
dYÖ
HC 1: Valve, heating circuit 1
dYA
HC 2: Pump, heating circuit 2
dXÖ
or
TWE: Cylinder loading pump (circulation pump for
cylinder heating)
HC 2: Valve, heating circuit 2
dXA
or
UP: Circulation pump DHW cylinder transfer of
heat (Y1)
or
ZP: DHW circulation pump (Y2)
or
(UP and ZP)
HC 3: Pump, heating circuit 3
dCÖ
or
TWE: Cylinder loading pump (circulation pump for
cylinder heating)
or
SOL: Solar circuit pump
HC 3: Valve, heating circuit 3
dCA
or
SOL: Diverter valve, solar
or
UP: Circulation pump DHW cylinder transfer of
heat (Y1)
or
ZP: DHW circulation pump (Y2)
or
(UP and ZP)
Connection and wiring diagram
147