Viessmann VITOCAL 300-G Installation And Service Instructions Manual page 222

Connection and wiring diagrams
Overview of the PCBs and connection options
sYD-sYH Factory connections
sXÖ-sXS Factory connections
Operational components 230 V~
Plug Terminals Function
fÖ
sYÖ 210.1
210.2
210.1
210.2
sYA 211.1
211.2
211.3
211.4
211.5
222
Power supply PCBs
Compressor control
stage 1 (type BW) via
EEV controller (refrig-
erant circuit control)
End of safety chain
Primary pump (heat
pump stage 1, type BW
or common primary
pump), well pump con-
trol
Secondary pump (heat
pump stage 1, type
BW)
Control of instantane-
ous heating water
heater, stage 1
Circulation pump for
cylinder heating or
three-way diverter
valve, heating/DHW
heating
NC function control
"natural cooling"
sXD-sXG On site connections
Explanation
Factory connection
■ Heat demand: Contact closed,
210.2 is 'live'
■ If the compressor will not start,
check whether it has been ena-
bled by the EEV controller (own
relay on EEV PCB)
Factory connection
'Live' in case of fault-free safety
chain
■ Max. output: 200 W
Connect on site
■ In systems without a heating
water buffer cylinder, no other
heating circuit pump is required
(see terminal 212.2)
■ Max. output: 130 W
Connect on site
Accessories
■ Output 10 W
Connect on site
■ Max. output: 130 W
■ Voltage: 230 V~
Connect on site
■ Max. output: 10 W
■ Voltage: 230 V~
Create circuit on site
(cont.)