OI_EC2-XC645CX_A1_A2L_A3_EN_Rev01_866933.docx EC2-XC645CX 29/54
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 - 25 s)
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
20. 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 - 30.0 °C/ 1 – 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 - 255 s)
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 - 255 s)
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 - 15.0 °C/ 1 - 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 - 15.0 °C/ 1 - 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 - 30.0 °C/ 1 - 60 °F)
ASH9 Probe selection for superheat monitoring (nP, P3, P4)
ASH9 = nP no superheat control
ASH9 = P3 the probe to calculate the superheat (SH) is the probe P3 (term. 38 - 42)
ASH9 = P4 the probe to calculate the superheat (SH) is the probe P4 (term. 22 - 23). In
this case also the parameter P4C must be set as nt10 or nt86.
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