Viessmann VITOCAL 151-A Installation And Service Instructions Manual page 45

Electrical connection
Opening the HPMU electronics module
3.
1.
Fig. 36
Indoor unit: Routing cables to the terminal area
Danger
Damaged wiring insulation can lead to serious
injury from electrical current and result in appli-
ance damage.
Route cables so that they cannot touch very hot,
vibrating or sharp-edged components.
(cont.)
2. 2x
Opening the EHCU electronics module
Fig. 37
Danger
Incorrect wiring can lead to serious injury from
electrical current and result in appliance dam-
age.
Take the following measures to prevent wires
drifting into the adjacent voltage area:
■ Route extra low voltage (ELV) leads < 42 V
separately from cables
Secure with cable ties.
Strip as little of the insulation as possible,
■
directly before the terminals. Bundle the
cables close to the corresponding terminals.
■ If 2 components are connected to the same
terminal, press both cores together in a single
wire ferrule.
!
Please note
Openly routed cables can be damaged by vibra-
tion.
Secure all cables inserted into the appliance
with at least 2 cable ties.
Installation sequence
2.
1.
42 V/230 V~/400 V~.
>
45