Viessmann Vitocal 300-G BW, Installation And Service Instructions Manual

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175
Function Explanation Connection
Auxiliary output with switch-
ing times (e.g. DHW circu-
lation pump) ■ Pmax.=150 W
■ Observe the information regarding
the total current drawn (from the
table)!
■ U=230 V
2X7.11
Central fault message Zero volt contact:
■ closed=fault
■ open=no fault
■ Contact breaking capacity 250 V~,
4(2) A
■ unsuitable for safety LV
2X7.12
2X7.13
Function components 230 V on PCB 2 (motherboard, terminal strip X8)
Function
Explanation Connection
End of safety chain ■ 'Live' in case of fault-free safety chain 2X8.1
Compressor control via
controller of the electronic
expansion valve (EEV) ■ Control internal contact between
2X8.1 and 2X8.2 is closed in case of
heat demand.
■ 2X8.2 is 'live'
■ If the compressor fails to operate, the
enable signals from the EEV control-
ler via a suitable relay to the EEV PCB
may be missing.
2X8.2
N/A N/A 2X8.3
2X8.4
Primary pump, well pump
control ■ Pmax.=200 W
■ Observe the information regarding
the total current drawn (from the
table)!
2X8.5
Natural cooling control ■ Observe the information regarding
the total current drawn (from the
table)!
■ This control signals is additionally
required with the AC-Box.
2X8.6
Connection and wiring diagrams
PCB 2: Function components 230 V
(cont.)
5368 522 UAE
Service