Overview Of The Electrical Connections In The Heat Pump Control Unit; Expansion Pcb (230 V~ Function Components) - Viessmann Vitocal 300-G Dismantling Instructions

Heat pump control unit electrical connections

Overview of the electrical connections in the heat pump control unit

Note
■ Route 230 V~ cables and LV cables separately and
bundle them tightly together at the terminals. This
ensures that, in the event of a fault, e.g. when
detaching a wire, the wires cannot drift into the adja-
cent voltage area.
■ Strip the insulation as close to the terminals as pos-
sible.
■ If 2 components are connected to the same terminal,
press both cores together in a single wire ferrule.
A
X5
X3
X7
X2
X6
X1
Fig. 16
Cross connect PCB: See page 22.
A
F1 Fuse 6.3 A (slow)
Main PCB: Make no connections.
B
F3 Fuse 6.3 A (slow)

Expansion PCB (230 V~ function components)

Information regarding the connection values
The specified output is the recommended connected
■
load.
■ The specified current indicates the max. switching
current of the switching contact. Observe the total
current of 5 A for all connected components.
The relay contacts for external heat generator and
■
central fault messages are unsuitable for safety LV.
B
F1
sXD
(cont.)
C
sVA
F3
F26
Expansion PCB: See next chapter.
C
Controller and sensor PCB: See page 23.
D
D
X31
F12
F20 F4
J3
F13
J4
F8
F14 F7 X24
F6
F16 F11
aVG
X25
X15
21