Viessmann Vitocal 300-G Installation And Service Instructions Manual page 28

Installation sequence
Electrical connection
Overview of the electrical connections of the heat pump control unit (type BW/BWC 301.B)
F6 F11 F16 F26
X24
F8 F7 F14
F27 F13
F4
F12 F20
X25
193C
193A
193B X31
Fig. 22
Cross connect PCB: See page 36.
A
F1 Fuse 6.3 A (slow)
Expansion PCB on main PCB: See page 32.
B
Main PCB (230 V~ components)
Information regarding the connection values
The specified output is the recommended connected
■
load.
■ The total output of all components connected directly
to the heat pump control unit (e.g. pumps, valves,
message facilities, contactors) must not exceed
1000 W.
If the total output is < 1000 W, the individual rating of
a component (e.g. pump, valve, message facility,
contactor) can be greater than specified. However,
the breaking capacity of the corresponding relay
must not be exceeded.
■ The stated current indicates the max. switching cur-
rent of the switching contact (observe the total cur-
rent of 5 A).
Controls for external heat source and central fault
■
messages are unsuitable for safety LV.
28
(cont.)
F3
J4
J3
X3
X2
X1
F1
Main PCB: See next chapter.
C
F3 Fuse 6.3 A (slow)
Controller and sensor PCB: See page 38.
D
Set the required parameters during commissioning:
See page 55 onwards.