Inserting Cables And Applying Strain Relief - Viessmann Vitotronic 200 Installation And Service Instructions Manual

Installation sequence
Overview of electrical connections
aJB Return temperature sensor T2
(accessories)
or
Temperature sensor cylinder
primary system (accessories)
aVD External hook-up
aVG KM BUS subscriber (acces-
sories)
aVH External hook-up
Main PCB 230 V~
sÖ A1 Heating circuit pump
or
Primary pump cylinder primary
system
or
Circulation pump
water heat exchanger
or
Switching output
sA Cylinder primary pump (acces-
sories)
sK DHW circulation pump (on
site)
sL Shunt pump or boiler circuit
pump (on site)
fÖ Power supply

Inserting cables and applying strain relief

Installing the control unit on the boiler
Route cables from below through
the front panel of the boiler into the
wiring chamber of the control unit.
16
(cont.)
fA
gÖ
gS A1 Mixer motor, return tempera-
lÖ
aBÖ
aBA
aBH
When connecting external switching
contacts or components to the low
flue gas/ voltage circuit of the control unit,
please observe the safety require-
ments of protection class II, i.e.
8.0 mm air gap/creep path or
2.0 mm insulation thickness towards
'live' components.
Ensure the safe electrical separa-
tion for all on-site components (incl.
PC/laptops), i.e. conforming to
EN 60 335 or IEC 65.
Control unit fitted to the boiler side
Route cables from below out of the
cable trunking into the control unit.
Burner stage 1
Central fault message
ture raising facility
or
Motor for three-way mixing
valve, cylinder primary system
Burner stage 2/mod.
External connections, e.g.
supplementary safety equip-
ment
Safety chain, zero volt
Power supply connection of
accessories