Opening Heat Management Unit (Hmu) On Gas Condensing And Fuel Cell Module; Electrical Connections - Viessmann Vitovalor PT2 Installation And Service Instructions For Contractors

Installation sequence

Opening heat management unit (HMU) on gas condensing and fuel cell module

3.
1.
Fig. 34
1. Swivel the casing forwards across the detente
point.
2. Undo the side release clips (red).
3. Swivel the wiring chamber flashing back out of the
casing.

Electrical connections

A B
40 156 156
Fig. 35
Connections to 230 V~ plugs
Power supply from the power distribution board
fÖ
External demand/blocking and switched power
lH
outlet
42
2.
2x
M
1~
P1 P2 96
!
Please note
Electronic assemblies can be damaged by elec-
trostatic discharge.
Prior to commencing any work, touch earthed
objects such as heating or water pipes to dis-
charge static loads.
C
74
Switched power outlet
aBH
P1 Power outlet for heating circuit pump for heating
circuit without mixer
P2 No function
D E
5 1 91 91