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Electronic control description,
Alarms
The controller has one hardware alarm output.
Alarm output is a bi-directional dry contact. Max load 60V/50mA. Contact is closed on
failure.
Two LED's indicates status of operation.
LED indication
Color
Green
Red
Data connection
Communication is possible between computer and the 9 pin D-SUB female.
1
2
3
4
5
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7
8
9
For service and test purpose, the communication line can be switched to terminal mode.
Can be used with PC and PuTTY terminal program, for change of operational settings
and monitoring during service.
Terminal use and adjustable parameters, described in separate document.
continued
STATUS
On
Off
Flashing
Off
1 flash
3 flash
5 flash
7 flash
8 flash
9 flash
10 flash
11 flash
13 flash
15 flash
Pin
Function
NC
NC
TXD- (Z)
TXD+ (Y)
RXD+ (A)
NC
RXD- (B)
NC
NC
Definition
Power supply OK
No power or Voltage out of range
Selftest on-going. See more at page 10
Normal operation
Internal fan failure
External fan failure
Compressor failure
Return air sensor failure
Condenser sensor failure
Compressor drive communication failure
Low supply voltage
High supply voltage
HP/LP failure
High temperature alarm
Illustration
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Continued overleaf
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