Connecting Several Accessories; Power Supply And Plusbus Connection - Viessmann EM-EA1 Installation And Service Instructions Manual

Connecting several accessories

Power supply and PlusBus connection

Power supply to all accessories via heat generator control unit
A
E
Fig. 18
Some accessories with direct power supply
A
E
Fig. 19
Heat generator control unit
A
Mixer extension kit for heating circuit with
B
mixer M2 (electronics module)
Mixer extension kit for heating circuit with
C
mixer M3 (electronics module)
Further accessories
D
In the following circumstances, use the contact (out-
■
put) of the accessories only to switch an on-site
relay:
An actuator with a higher power demand than the
fuse rating required for the accessories, e.g. a circu-
lation pump, is connected to the contact (output) of
the accessories.
In the following circumstances, connect one or more
■
accessories directly to the mains supply via an
ON/OFF switch:
The max. permissible total current of the heat gener-
ator control unit is exceeded.
Note
In this event, the accessories concerned cannot be
isolated with the ON/OFF switch on the control unit.
B C
B C
D
D
ON/OFF switch
E
fÖ (A) Power supply
PlusBus
jF
/ Power supply to accessories in the heat gen-
lH aBH
erator control unit
Installation sequence
19