Operating instructions

58
Installation
Summary of electrical connections (cont.)
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
Main PCB 230V~
sÖA1 Cylinder primary pump
or
Circulation pump  flue
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
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.
Ensure a safe electrical separation
for all on−site components (incl.
PC/laptops) to conform to EN60335
or IEC65.
5862730GB