Viessmann VITOTRONIC 100 Installation And Service Instructions Manual page 58

Installation
Summary of electrical connections
Main PCB low voltage
§
Boiler water temperature
sensor
%
Cylinder temperature sensor
Cylinder temperature sensor 2
for cylinder storage system
(accessories)
aG
Flue gas temperature sensor
(accessories)
aJA Temperature sensor of
Therm−Control
or
Return temperature sensor T1
(accessories)
aJB Return temperature sensor T2
(accessories) or cylinder
storage system temperature
sensor
aVD
External hook−up
aVG
KM BUS user, e.g. plug−in
adaptor for external safety
equipment
aVH
External hook−up
When connecting external switching
contacts or components to the low
voltage circuit of the control unit,
please observe the safety
requirements of protection class II,
i.e. 8.0 mm air gap/creep path or
2.0 mm insulation thickness from
'live' components.
58
(cont.)
Main PCB 230V~
sÖ A1 Cylinder primary pump
or
Circulation pump
gas/water heat exchanger
or
switching output
sA
Cylinder primary pump
(accessories)
sL
Shunt pump (on site)
or
Boiler circuit pump (on site)
fÖ
Power supply
fA
Burner stage 1
gÖ
Central fault message
gS A1 Butterfly valve
or
Motor for three−way mixer for
raising the return temperature
or
Motor for three−way mixing
valve
Cylinder storage system
lÖ
Burner stage 2/mod.
aBÖ
External connections,
e.g. supplementary safety
equipment
aBA
Safety chain, zero volt (230 V)
aBH
Power supply for accessories
Ensure a safe electrical separation
for all on−site components (incl.
PC/laptops) to conform to EN 60 335
or IEC 65.
flue