Viessmann 301.BS090, Installation And Service Instructions For Contractors

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400 V~/230 V~ components
External connections
Terminals
Function Explanation
12X0 Compressor 1 operating message Floating N/O contact:
■
Closed: Compressor 1 running
■
Open: Compressor 1 not running
Connection values
■
Max. voltage: 250 V~
■
Max. switching current: 4 A (AC1)
12X2 Compressor 2 operating message Floating N/O contact:
■
Closed: Compressor 2 running
■
Open: Compressor 2 not running
Connection values
■
Max. voltage: 250 V~
■
Max. switching current: 4 A (AC1)
12K8/11;14 Heat pump central fault message Floating N/O contact:
■
Closed: No fault
■
Open: Heat pump fault
Connection values
■
Max. voltage: 250 V~
■
Max. switching current: 4 A (AC1)
Circuit protection from load MCB/fuse 5FC1 (observe the maximum total current of 16 A)
Terminals
Function Explanation
13X0 Circulation pump, evaporator
Heat pump Connection values
■
Max. output: 4000 W
■
Voltage:
400 V~/230 V~
■
Max. switching current: 9 A (AC3)
13X5 Circulation pump, condenser
Heat pump Connection values
■
Max. output: 4000 W
■
Voltage:
400 V~/230 V~
■
Max. switching current: 9 A (AC3)
Terminals Function Explanation
21X1 Circulation pump, groundwater
Heat yield Connection values
■
Max. output: 4000 W
■
Voltage:
400 V~/230 V~
■
Max. switching current: 9 A (AC3)
Note
Fit the service switch upstream of the circulation
pump.
13X2 Pressure switch, primary circuit/frost
stat
Heat yield Insert jumper if no safety components are instal-
led.
Installation sequence
Overview of electrical connections
(cont.)
5549 991 GB
Installation