Emerson Dixell XC645CX User Manual

1592001440 XC645CX GB r3.4 31.10.2017.docx XC645CX 27/54
LSE: Minimum set point: The measurement unit depends on dEU parameter. It sets the
minimum value that can be used for the set point, to prevent the end user from setting
incorrect values.
HSE: Maximum set point: The measurement unit depends on dEU parameter. It sets the
maximum acceptable value for set point.
17.6 Liquid injection thermostat
Lit: Set point ( °C) for cooling injection thermostat (0 ÷ 150°C) The reference probe is the
P3, the thermostat relay is given by the relay set as oAi = Lin.
Lid: Differential for cooling injection thermostat (0.1 ÷ 10.0) The reference probe is set by
LiPr parameter
LiPr Probe for cooling injection thermostat:
nP: function disabled
P3: probe P3 (term. 38-42)
P4: probe P4 (term. 22-23)
17.7 Fans regulation
Pb Proportional band zone width (00.10÷5.00bar/0.5÷30°C or 1÷80PSI/1÷50°F).
Set the dEU par. and the target set point for fans before setting this parameter. The
band is symmetrical compared to the target set point, with extremes: SETF+Pb/2 ÷ SETF
-Pb/2. The measurement unit depends on the dEU par.
ESF Energy saving value for fans: (-20÷20bar; -50÷50°C) this value is add to the fans set
point.
Fon: Time delay between the insertion of two different fans (0÷255sec).
FoF: Time delay between switching off of two different compressors (0÷255 sec)
LSF: Minimum set point for fan: The measurement unit depends on dEU parameter. It sets
the minimum value that can be used for the set point, to prevent the end user from setting
incorrect values.
HSF: Maximum set point for fan: The measurement unit depends on dEU parameter. It sets
the maximum acceptable value for set point.
17.8 Alarms – compressor section
PAo: Alarm probe exclusion at power on. it is the period starting from instrument switch on,
before an alarm probe is signaled. (0÷255 min). During this time if the pressure is out of
range all the compressor are switched on.
LAL: Low pressure (temperature) alarm – compressor section: The measurement unit
depends on dEU parameter: (PA04 ÷ HAL bar; -50.0÷HAL °C; PA04÷HAL PSI; -58÷HAL
°F) It’s independent from the set point. When the value LAL is reached the A03C alarm
is enabled, (possibly after the tAo delay time).
HAL: High pressure (temperature) alarm– compressor section: The measurement unit
depends on dEU parameter: (LAL ÷ PA20 bar; LAL÷150.0 °C; LAL÷PA20 PSI; LAL÷302
°F). It’s independent from the set point. When the value HAL is reached the A04C alarm
is enabled, (possibly after the tAo delay time).
tAo: Low and High pressure (temperature) alarms delay– compressor section: (0÷255
min) time interval between the detection of a pressure (temperature) alarm condition and
alarm signaling.
ELP Electronic pressure switch threshold: (-50°C÷SETC; -58°F÷SETC; PA04÷SETC);
Pressure / Temperature value at which all the compressors are switched off. It has to be
set some degrees above the mechanical low pressure switch value, in order to prevent
mechanical low pressure activation.
SEr: Service request: (1÷9990 hours, res. 10h) number of running hours after that the “A14”
maintenance call is generated.
PEn: Low pressure-switch intervention numbers: (0÷15). If the low pressure-switch is
enabled PEn times in the PEI interval, the controller is locked. Only the manually

Emerson Dixell XC645CX Specifications

General

Brand	Emerson
Model	Dixell XC645CX
Category	Controller
Language	English