24
Power supply and PlusBus connection of accessories
Power supply of all accessories at the HMU heat management unit
74 74
40A 40
74 74
40A 40
B
C
74
40 96/156
A
74 74
40A 40
D
E
Fig. 18
Some accessories with direct power supply
74 74
40A 40
74 74
40A 40
B
C
74
40 96/156
A
74 74
40A 40
D
E
Fig. 19
A
HMU heat management unit, heat generator
B
Mixer extension kit (ADIO electronics module)
C
Mixer extension kit (ADIO electronics module)
D
EM-EA1 extension (DIO electronics module)
and/or EM-S1 extension (ADIO or SDIO/
SM1A electronics module)
E
ON/OFF switch
fÖ
Mains input
fÖ
A
Power outlet
jF
PlusBus
lH
/
aBH
Power outlet on HMU heat management unit
PlusBus system length max. 50 m for 0.34 mm
2
cable
cross-section and unshielded cable.
If the current flowing to the connected working parts
(e.g. circulation pumps) is higher than the fuse rating
of the relevant accessory, only use the output con-
cerned to control an on-site relay.
Accessories
Internal fuse protec-
tion
EM-M1, EM-MX mixer exten-
sion kit
2 A
EM-EA1 extension
2 A
EM-S1 extension (not for
Vitodens 222-F, 222-W and
333-F)
2 A
Danger
Incorrect wiring can lead to serious injury from
electrical current and result in appliance dam-
age.
■
Route extra low voltage (ELV) leads < 42 V
separately from cables
>
42 V/230 V~.
■
Only strip the minimum of insulation from
cables as close as possible to the terminals
and bundle tightly to the corresponding termi-
nals.
■
Secure cables with cable ties.
Installation sequence
Electrical connections
(cont.)
6151778
Installation
