
1592027615 XW20LT RTC GB r1.0 18.09.2012 XW20LT 3/6
DEFROST
dFP Probe selection for defrost ter ination: (nP; P1; P2; P3; P4) nP = no probe;
P1 =thermostat probe; P2 = evaporator probe; P3 =configurable probe; P4 = Probe on
Hot Key plug.
dtE Defrost ter ination te perature: (-55 to 50°C; -67 to 122°F) (enabled only when
EdF=Pb) sets the temperature measured by the evaporator probe, which causes the
end of defrost.
idF Interval between defrost cycles: (0 to 120hours) determines the interval of time
between two defrost cycles.
MdF (Maxi u ) length for defrost: (0 to 255min) when P2P=n, (not evaporator probe:
timed defrost) it sets the defrost duration. When P2P=Y (defrost end based on
temperature) it sets the maximum length for defrost.
dSd Start defrost delay: (0 to 99min) this is useful when different defrost start times are
necessary to avoid overloading the plant.
dFd Te perature displayed during defrost: (rt; it; SEt; dEF) rt = real temperature;
it = temperature at defrost start; SEt = set point; dEF = “dEF” label.
dAd MAX display delay after defrost: (0 to 255min) sets the maximum time between the
end of defrost and the restarting of the real room temperature display.
CF Te perature easure ent unit: (°C; °F) °C = Celsius; °F = Fahrenheit.
WARNING: When the measurement unit is changed the SET point and the values of
the parameters HY, LS, US, ot, ALU and ALL have to be checked and modified (if
necessary).
Fdt Drip ti e: (0 to 120min) time interval between reaching defrost termination
temperature and the restoring of the control’s normal operation. This time allows the
evaporator to eliminate water drops that might have formed due to defrost.
dPo First defrost after start-up: (n; Y) n = after the idF time, Y = immediately.
dAF Defrost delay after continuous cycle: (0.0 to 24h00min, res. 10min) time interval
between the end of the fast freezing cycle and the following defrost related to it.
AUXILIARY THERMOSTAT CONFIGURATION – OAx = AUS
ACH Kind of regulation for auxiliary relay: (Ht; CL) Ht = heating; CL = cooling.
SAA Set Point for auxiliary relay: (-55.0 to 150.0°C; -67 to 302°F) it defines the room
temperature set point to switch auxiliary relay.
SHY Differential for auxiliary output: (0.1 to 25.5°C; 1 to 45°F) intervention differential for
auxiliary output set point.
•ACH=CL, AUX Cut in is [SAA+SHY]; AUX Cut out is SAA.
ACH=Ht, AUX Cut in is [SAA–SHY]; AUX Cut out is SAA.
ArP Probe selection for auxiliary: (nP; P1; P2; P3; P4) nP = no probe, the auxiliary relay is
switched only by the digital input; P1 = Probe 1 (Thermostat probe); P2 = Probe 2
(evaporator probe); P3 = Probe 3 (display probe); P4 = Probe 4.
Sdd Auxiliary relay off during defrost: (n; Y) n = the auxiliary relay operates during defrost.
Y = the auxiliary relay is switched off during defrost.
ALARMS
ALP Probe selection for alar : (nP; P1; P2; P3; P4) nP = no probe, the temperature alarms
are disabled; P1 = Probe 1 (Thermostat probe); P2 = Probe 2 (evaporator probe);
P3 = Probe 3 (display probe); P4 = Fourth probe.
ALC Te perature alar s configuration: (Ab; rE) Ab = absolute temperature, alarm
temperature is given by the ALL or ALU values. rE = temperature alarms are referred to
the set point. Temperature alarm is enabled when the temperature exceeds the
[SET+ALU] or [SET-ALL] values.
ALU MAXIMUM te perature alar :
•If ALC=Ab: [ALL to 150.0°C or ALL to 302°F]
•If ALC=rE: [0.0 to 50.0°C or 0 to 90°F]
when this temperature is reached the alarm is enabled, after the ALd delay time.
ALL Mini u te perature alar :
•If ALC=Ab: [-55°C to ALU; -67 to ALU]
•If ALC=rE: [0.0 to 50.0°C or 0 to 90°F]
when this temperature is reached the alarm is enabled, after the ALd delay time.
AFH Differential for te perature alar recovery: (0.1 to 25.5°C; 1 to 45°F) intervention
differential for recovery of temperature alarm.
ALd Te perature alar delay: (0 to 255 min) time interval between the detection of an
alarm condition and alarm signalling.
dAo Exclusion of te perature alar at start-up: (0.0 to 24h00min, res. 10min) time
interval between the detection of the temperature alarm condition after instrument power
on and alarm signalling.
CONDENSER TEMPERATURE ALARM
AP2 Probe selection for te perature alar of condenser: (nP; P1; P2; P3; P4)
nP = no probe; P1 = thermostat probe; P2 = evaporator probe; P3 = configurable probe;
P4 = Probe on Hot Key plug.
AL2 Low te perature alar of condenser: (-55 to 150°C; -67 to 302°F) when this
temperature is reached the LA2 alarm is signalled, possibly after the Ad2 delay.
Au2 High te perature alar of condenser: (-55 to 150°C; -67 to 302°F) when this
temperature is reached the HA2 alarm is signalled, possibly after the Ad2 delay.
AH2 Differential for te perature condenser alar recovery: 0.1 to 25.5°C; 1 to 45°F
Ad2 Condenser te perature alar delay: (0 to 255 min) time interval between the
detection of the condenser alarm condition and alarm signalling.
dA2 Condenser te perature alar exclusion at start up: 0.0 to 24h00min, res. 10min.
bLL Co pressor off with low te perature alar of condenser: (n; Y) n = compressor
keeps on working; Y = compressor is switched off till the alarm is present, in any case
regulation restarts after AC time at minimum.
AC2 Co pressor off with high te perature alar of condenser: (n; Y) n = compressor
keeps on working; Y = compressor is switched off till the alarm is present, in any case
regulation restarts after AC time at minimum.
AUXILIARY RELAYS
tbA Alar relay silencing (with oAx =ALr): (n; Y) n = silencing disabled: alarm relay stays
on till alarm condition lasts. Y = silencing enabled: alarm relay is switched OFF by
pressing a key during an alarm.
oA3 Third relay configuration (1-3): (dEF; FAn; ALr; LiG; AUS; onF; db; dEF2; HES) dEF =
defrost; FAn = do not select it; ALr = alarm; LiG = light; AUS = Auxiliary relay; onF =
always on with instrument on; db = neutral zone; dEF2 = do not select it; HES = night
blind.
AoP Alar relay polarity: (CL; oP) it set if the alarm relay is open or closed when an alarm
occurs. CL = terminals closed during an alarm; oP = terminals open during an alarm.
DIGITAL INPUTS
i1P First digital input polarity: (oP; CL) oP = the digital input is activated by opening the
contact; CL = the digital input is activated by closing the contact.
i1F First digital input configuration: (EAL; bAL; PAL; dor; dEF; ES; AUS; Htr; FAn; HdF;
onF; Sbt) EAL = external alarm: “EA” message is displayed; bAL = serious alarm “CA”
message is displayed; PAL = pressure switch alarm, “CA” message is displayed; dor =
door switch function; dEF = activation of a defrost cycle; ES = energy saving; AUS =
auxiliary relay activation with oA2=AUS; Htr = type of inverting action (cooling or
heating); FAn = fan; HdF = Holiday defrost (enable only with RTC); onF = to switch the
controller off; Sbt = to activate Sabbath mode.
i2P Second digital input polarity: (oP; CL) oP = the digital input is activated by opening the
contact; CL = the digital input is activated by closing the contact.
i2F Second digital input configuration: (EAL; bAL; PAL; dor; dEF; ES; AUS; Htr; FAn;
HdF; onF; Sbt) EAL = external alarm: “EA” message is displayed; bAL = serious alarm
“CA” message is displayed; PAL = pressure switch alarm, “CA” message is displayed;
dor = door switch function; dEF = activation of a defrost cycle; ES = energy saving; AUS
= auxiliary relay activation with oA2=AUS; Htr = type of inverting action (cooling or
heating); FAn = fan; HdF = Holiday defrost (enable only with RTC); onF = to switch the
controller off; Sbt = to activate Sabbath mode.
did Digital input 1 alar delay: (0 to 255 min) delay between the detection of the external
alarm condition and its signalling.
When i1F= PAL, it is the interval of time to calculate the number of pressure switch
activation.
doA Door open alar delay: 0 to 255 min.
nPS Nu ber of pressure switch activation: (0 to 15) Number of activation, during the did
or d2d interval, before signalling an alarm event (i1F, i2F=PAL).
If the nPS activation during did or d2d time is reached, switch off and on the instrument
to restart normal regulation.
odC Co pressor status when open door: (no; FAn; CPr;F_C;) no = normal;
FAn = normal; CPr = compressor OFF, F_C = compressor OFF.
rrd Outputs restart after door open alar : (n; Y) n = outputs follow the odC parameter.
Y = outputs restart with a door open alarm.
HES Delta te perature during an Energy Saving cycle: (-30.0 to 30.0°C; -54 to 54°F) it
sets the increasing value of the set point [SET+HES] during the Energy Saving cycle.
CURRENT TIME AND WEEKLY HOLIDAYS (ONLY FOR MODELS WITH RTC)
Hur Current hour: 0 to 23h.
Min Current inute: 0 to 59min.
dAY Current day: Sun to SAt.
Hd1 First weekly holiday: (Sun to nu) set the first day of the week which follows the holiday
times.
Hd2 Second weekly holiday: (Sun to nu) set the second day of the week which follows the
holiday times.
N.B.: Hd1, Hd2 can be set also as “nu” value (Not Used).
ENERGY SAVING TIMES (only for odels with rtc)
ILE Energy Saving cycle start during workdays: (0 to 23h50min) during the Energy
Saving cycle the set point is increased by the value in HES so that the operation set
point is SET+HES.
dLE Energy Saving cycle length during workdays: (0 to 24h00min) sets the duration of the
Energy Saving cycle on workdays.
ISE Energy Saving cycle start on holidays: 0 to 23h50min.
dSE Energy Saving cycle length on holidays: 0 to 24h00min.
TO SET DEFROST TIMES (ONLY FOR MODELS WITH RTC)
Ld1÷Ld6 Workday defrost start: (0 to 23h50min) these parameters set the beginning of the 6
programmable defrost cycles during workdays. Ex: when Ld2=12.4 the second
defrost starts at 12.40 during workdays.
Sd1÷Sd6 Holiday defrost start: (0 to 23h50min) these parameters set the beginning of the 6
programmable defrost cycles on holidays. Ex: when Sd2=3.4 the second defrost
starts at 3.40 on holidays.
N.B.: to disable a defrost cycle set it to “nu” (not used).
OTHER
LoC
Lock keyboard ti er: nu(9) = keyboard never blocked, or 10 to 255 sec
Adr Serial address: (1 to 247) identifies the instrument address when connected to a
odBUS compatible monitoring system.
PbC Type of probe: (PtC; ntC) it allows to set the kind of probe used by the instrument:
PtC = PTC probe, ntC = NTC probe.
onF On/Off key enabling: (nU; oFF; ES) nU = disabled; oFF = enabled; ES = not set it.
dP1 Thermostat probe display.
dP2 Evaporator probe display.
dP3 Third probe display.
dP4 Fourth probe display.
rSE Real set point: it shows the set point used during the energy saving cycle or during the
continuous cycle.
rEL Software release for internal use.
Ptb Parameter table code: readable only.