1592001830 XC645D GB r3.4 04.09.2017.docx XC645D 27/50
17.10 Alarms – fans section
LAF: Low pressure alarm – fans section: The measurement unit depends on the dEU
parameter: (FA04 ÷ HAF bar; -50.0÷HAF °C; FA04÷HAF PSI; -58÷HAF °F) It’s
independent from the set point. When the value LAF is reached the LA2 alarm is enabled,
(possibly after the AFd delay time).
HAF: High pressure alarm – fans section: The measurement unit depends on the dEU
parameter: (LAF÷FA20 bar; LAF÷150.0 °C; LAF÷FA20 PSI; LAF÷302 °F). It’s
independent from the set point. When the value HAF is reached the HA2 alarm is enabled,
(possibly after the AFd delay time).
AFd: Low and High pressure alarms delay – fans section: (0÷255 min) time interval
between the detection of a pressure alarm condition in the fans section and alarm
signaling.
HFC Compressors off with high pressure (temperature) alarm for fans
no = compressors are not influenced by this alarm
yES = compressors are turned off in case of high pressure (temperature) alarm of fans
HFdP Digital Compressor Capacity percentage in case of high condenser pressure
(temperature) alarm (0÷80%; with 0 the compressor is stopped)
dHF Interval between 2 compressors turning off in case of high pressure (temperature)
alarm for fans (0 ÷ 255 sec)
PnF: High pressure-switch intervention numbers – fans section: (0÷15 with 0 the manually
unlocking is disabled) if the high pressure-switch is enabled PnF times in the PiF interval,
the controller is locked. It can be unlocked only manually. See paragraph 0. Every time
the pressure-switch is enabled all the compressors are turned off and all the fans are
turned on.
PiF: Pressure-switch interventions time – fans section (1÷15 min) Interval, linked to the
PEn parameter, for counting interventions of the high pressure-switch..
FPr Number of fans engaged with faulty probe. (0÷#fans).
17.11 Suction superheat
ASH0 Differential for low superheat pre-alarm. (0.1 to 30.0°C/ 1 to 60°F).
The low superheat pre-alarm warning is sent when the superheat (SH) is lower than ASH2
(low superheat alarm threshold) + ASH0, possibly after the ASH1 delay.
ASH1 Delay for signalling low superheat pre-alarm (0÷255sec)
If the superheat is below the ASH2+ASH0 threshold for ASH1 time the low superheat
pre-alarm warning is sent.
ASH2 Low suction superheat alarm threshold (0.1÷15.0°C/ 1÷30°F). With SH < ASH2 the
low superheat alarm is sent, possibly after the ASH3 delay
ASH3 Delay for signalling low superheat alarm (0÷255sec)
If the superheat is below the ASH2 threshold for ASH3 time the low superheat alarm
message is sent.
ASH4 Switching off compressors with low superheat alarm (No, Yes)
ASH4 = no: compressors keep on working even with low superheat alarm.
ASH4 = yES: compressors are stopped in case of low superheat alarm.
ASH5 Differential to restart regulation after of low superheat alarm with compressor stop
(0.1 to 15.0°C/ 1 to 30°F). In case of regulation stop (ASH4= yES), it restarts when SH >
ASH2+ASH5
ASH6 Delay to restart regulation after superheat > ASH2+ASH5 (0÷255 min). If the
regulation is stopped because of low superheat alarm, it can restart when
SH>ASH2+ASH5 for the ASH6 time.
ASH7 Superheat value to enable hot gas injecting valve (0.1 to 15.0°C/ 1 to 30°F)
With a relay set as hot gas injection valve, (oA2 or oA3 or oA4 = HGi), the relay is on with
SH < ASH7 – ASH8.
ASH8 Differential for ASH7 (0.1 to 30.0°C/ 1 to 60°F)
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