Viessmann VITODENS 222-F Installation And Service Instructions Manual page 21

Electrical connections
Power supply and PlusBus connection of accessories
Power supply of all accessories at the HMU heat management unit
A
E
Fig. 18
Some accessories with direct power supply
A
E
Fig. 19
HMU heat management unit, heat generator
A
Mixer extension kit (ADIO electronics module)
B
Mixer extension kit (ADIO electronics module)
C
EM-EA1 extension (DIO electronics module)
D
and/or EM-S1 extension (ADIO or SDIO/
SM1A electronics module)
PlusBus system length max. 50 m for 0.34 mm
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
EM-M1, EM-MX mixer exten-
sion kit
EM-EA1 extension
EM-S1 extension (not for
Vitodens 222-F, 222-W and
333-F)
(cont.)
B C
B C
2
cable
Internal fuse protec-
tion
2 A
2 A
2 A
D
D
ON/OFF switch
E
Mains input
fÖ
A Power outlet
fÖ
PlusBus
jF
/ Power outlet on HMU heat management unit
lH aBH
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
■ 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
42 V/230 V~.
>
21