Viessmann VITOCAL 300-G Operations Instructions download pdf (Page 223)

223

Plug Terminals Function Explanation

sYS

212.1 AC function control

"active cooling"

■ Max. output: 10 W

■ Voltage: 230 V~

Create circuit on site

212.2 Heating circuit pump

for heating circuit with-

out mixer (A1)

■ This pump is installed in addition

to the secondary pump if a heat-

ing water buffer cylinder is instal-

led.

■ Max. output: 100 W

Connect on site

212.3 DHW circulation pump ■ Max. output: 50 W

■ Voltage: 230 V~

Connect on site

sXÖ

220.1

220.2

Compressor control

stage 2 (type BWS) via

EEV controller (refrig-

erant circuit control)

■ Heat demand: Contact closed,

220.2 is 'live'

■ If the compressor will not start,

check whether it has been ena-

bled by the EEV controller stage

2 (own relay on EEV PCB stage

2)

Factory connection

sXS

222.1 Mixer motor control for

external heat source

Signal Mixer CLOSED

■ Voltage: 230 V~

Connect on site

222.2 Mixer motor control for

external heat source

Signal Mixer OPEN

■ Voltage: 230 V~

Connect on site

222.3

222.4

External heat source

control

Zero volt contact:

■ Contact load 230 V/50 Hz,

4(2) A

Connect on site

sXD

223.1

223.2

Central fault message Zero volt contact:

■ Closed: Fault

■ Open: No fault

■ Contact load 230 V/50 Hz,

4(2) A

■ Not suitable for safety LV

Connect on site

Connection and wiring diagrams

Overview of the PCBs and connection options

(cont.)

5442 829 GB

Service

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