dixell XC660D User Manual

1592001850 XC660D GB r3.4 04.09.2017.docx XC660D 42/55
22.3 Suction superheat monitoring
Controller can monitor the suction superheat, and signal situations of low superheat, with a pre-
alarm and alarm thresholds.
According to the settings, compressors can be stopped in case of low superheat alarm, to
preserve compressor integrity.
22.3.1 Suction Superheat detecting
To detect the suction
superheat an auxiliary
probe among P3 (term.
38-42) or P4 (term. 22-
23) has to be set as
superheat temperature
probe.
To do this set ASH9 = P3
or P4.
Controller automatically
calculates the suction
superheat using the
value of the suction
probe P1 and the probe
set in the parameter
ASH9.
The SH is available after
1 minute since at least
one compressor is running.
22.3.2 Low superheat signalling and actions
Controller can signal low superheat pre-alarm, only warning, and low superheat alarm, warning
and regulation according to parameter ASH4.
The alarm messages and the regulation are described in the following table
Label
Meaning
Cause
Action
Recovery
PrSH
Low
superheat
Pre-allarm
The superheat is less
than: SH< ASH2 +
ASH0 for ASH1 time
Only warning
Automatic:
when superheat:
SH>ASH0+ASH2+1°C(2°F)
ALSH
Low
superheat
allarm
The superheat is less
than: SH< ASH2 for
ASH3 time
Regulation depends on ASH4:
ASH4 = no: regulation not affected.
ASH4 = yes: regulation is stopped.
Automatic:
when superheat:
SH> ASH5 + ASH2

dixell XC660D Specifications

General

Brand	dixell
Model	XC660D
Category	Controller
Language	English