Overview Of Electrical Connections; Power Supply - Viessmann SM1 Installation And Service Instructions Manual

Overview of electrical connections

aVG % &
Fig. 2
Solar control module
A
Cylinder temperature sensor NTC 10 k
%
ard delivery)
With plug
%
Collector temperature sensor NTC 20 k
&
(standard delivery)
Temperature sensor NTC 10 k
/
!
Please note
Electronic assemblies can be damaged by elec-
trostatic discharge.
Before beginning work, touch an earthed object
such as heating or water pipes to discharge any
static.

Power supply

Accessories are connected to the power supply via
plug on the boiler control unit.
lH
Should the total load of the accessories exceed
400 W, then individual accessories must be connected
directly to the mains.
Danger
Incorrectly executed electrical installations can
result in injuries from electrical current and in
damage to the appliance.
Connect the power supply and implement all
safety measures (e.g. RCD circuit) in accord-
ance with the following regulations:
■ IEC 60364-4-41
■ VDE regulations
■ Connection requirements specified by your
local power supply utility
Protect the power cable with a fuse/MCB of up
■
to 16 A.
A
/ aÖ [{]
PWM
(stand-
Ω
Ω
(if installed)
Ω
sS sF fÖ
L ? N L ? N
N L
?
M
230 V~
1~
M
1~
Temperature sensor NTC 10 k
aÖ
Transfer pump or 3-way diverter valve
sS
Solar circuit pump
sF
Power supply
fÖ
KM BUS for boiler control unit
aVG
PWM Speed control, solar circuit pump (if circulation
pump with PWM control installed)
Note
Relieve strain on-site cables.
Blank off unnecessary knockouts with cable grommets
(sealed, not cut out).
Danger
The absence of component earthing can lead to
serious injury from electric current if an electrical
fault occurs.
The appliance and pipework must be connected
to the equipotential bonding of the building.
Isolators for non-earthed conductors
■ Install an isolator in the power cable to provide
omnipolar separation from the mains for all active
conductors, corresponding to overvoltage category
III (3 mm) for full isolation. This isolator must be fitted
in the permanent electrical installation, in line with
the installation requirements.
■ We additionally recommend installing an AC/DC-
sensitive RCD, type B
that can occur with energy efficient equipment.
Installation sequence
(if installed)
Ω
, for DC (fault) currents
7