TECHNICAL MANUAL
CVM 2
C 5001 CV/01-99 IT
6
1.3
Live digital inputs
The following table shows the logic meaning of the AT digital inputs (230 Vac) and their arrangement:
TERMINALS
MEANING
11, 12, 17
Common to all high voltage inputs
22 - AT1
Circuit 1 high pressure switch
16 - AT2
Circuit 2 high pressure switch
23 - AT3
Circuit 1 low pressure switch
15 – AT4
Circuit 2 low pressure switch
18 – AT5
Circuit 1 compressor thermal protection
14 – AT6
Circuit 2 compressor thermal protection
19 – AT7
Circuit 1 fans thermal protection
13 – AT8
Circuit 2 fans thermal protection
20 – AT9
Water differential pressure switch and external flow switch
21 – AT10
ON/OFF switch
1.4
Relay outputs
RELAY
N.O.
N.C.
COM.
RL1 Cumulative alarm
41
39
40
RL2 Antifreeze
44
RL3 circuit 1 fan control
35
34
RL4 circuit 1 compressor control
43
RL5 circuit 2 compressor control
36
37
RL6 circuit 2 fan control
33
RL8 circuit 1 4-way valve control
46
47
45
RL9 circuit 2 4-way valve control
38
RL10 water pump control
42
