Viessmann VITOCAL 242-S Installation And Service Instructions Manual page 43

Electrical connection
A Expansion PCB on main PCB: Make
no on-site connections
B Main PCB: See page 43.
F3 Fuse 6.3 A (slow)
C Controller and sensor PCB: See
page 48.
D AVI PCB: See page 51.
F101 Fuse 1.0 A (slow)
E Luster terminals: See page 46.
F1 Fuse 6.3 A (slow)
X1 Terminals for earth conductor of
all associated system compo-
nents
X2 Terminals for neutral conductor
of all associated system com-
ponents
F Switching module and power supply
for instantaneous heating water
heater: See page 58.
Internal unit: Main PCB (function components 230 V~)
Information regarding the connection
values
■ The specified output is the recommen-
ded connected load.
■ The total output of all components con-
nected directly to the heat pump con-
trol unit (e.g. pumps, valves, message
facilities, contactors) must not exceed
1000 W.
If the total output is < 1000 W, the indi-
vidual rating of a component (e.g.
pump, valve, message facility, contac-
tor) can be greater than specified.
However, the breaking capacity of the
relevant relay must not be exceeded.
■ The specified current indicates the
max. switching current of the switching
contact. Observe total current of 5 A.
(cont.)
Set the required parameters during com-
missioning: See from page 77.
Installation sequence
43