Viessmann Vitotronic 200 KW2 Installation And Service Instructions Manual page 10

Installation
Summary of electrical connections
Plug 230 V~
sÖ Heating circuit pump A1
(accessory)
sÖ Heating circuit pump mixer
circuit M2 (accessory)
sA Cylinder primary pump
(accessory)
sK DHW circulation pump (on site)
fÖ Mains power connection
fA Burner
gS Mixer motor (accessory)
X12 External burner start (stage 1)
When connecting external switching
contacts or components to the
protective low voltage of the control
unit, please observe the safety
requirements of protection class II,
i.e. 8.0 mm air gap/creeping distance
or 2.0 mm insulation thickness from
'live' components.
Ensure a safe electrical separation
for all on−site components (incl.
PC/laptops) to EN 60 335 or IEC 65.
10
(cont.)
Low voltage plug
! Outside temperature sensor
? Flow temperature sensor
(accessory)
§ Boiler temperature sensor
% Cylinder temperature sensor
aG Flue gas temperature sensor
(accessory)
aJ Return temperature sensor
(accessory)
aVG KM BUS user or distributor
(accessory)
a:A Two−stage/mod. burner
extension (part of the standard
boiler delivery)