Viessmann Vitocal 252-A Series - Page 64

64
Overview of electrical terminal areas
A
B
C
D
E
Fig. 47
A
Extra low voltage (ELV) terminal area < 42 V
(upper PCB)
B
Terminal area 230 V~/400 V~ (lower PCB)
C
HPMU electronics module
D
HMI programming unit
E
EHCU electronics module
Opening electrical terminal areas
!
Please note
Electronic assemblies can be damaged by elec-
trostatic discharge.
Before beginning work, touch earthed objects,
e.g. heating or water pipes, to discharge any
static.
Electrical connections
Electrical connection of the indoor unit (cont.)
6222080
Installation