DIXELL EMERSON XR75CH User Manual
-
EdF=rtC, the defrost is real time controlled, depending on the hours set in the parameters  
Ld1...Ld6 (for workdays) and in Sd1…Sd6 (for holidays).  
Other parameters are used to control defrosting cycles: the maximum length (MdF) and defrosting  
modes: timed or controlled by the evaporator’s probe (P2P).  
At the end of defrost dripping time is started, its length is set in the Fdt parameter. With Fdt=0 the  
dripping time is disabled.  
Digital controller for medium-low temperature  
refrigeration applications  
XR75CH  
3.3 CONTROL OF EVAPORATOR FANS  
-Manual for the SW rel. 2.6-  
The fan control mode is selected by means of the FnC parameter:  
FnC=C_n, fans will switch ON and OFF with the compressor and not run during defrost.  
FnC=o_n, fans will run even if the compressor is off, and not run during defrost.  
1. GENERAL WARNING__________________________________________________________1  
2. GENERAL DESCRIPTION ______________________________________________________1  
3. CONTROLLING LOADS________________________________________________________1  
4. FRONT PANEL COMMANDS ___________________________________________________1  
5. MAX & MIN TEMPERATURE MEMORIZATION _____________________________________2  
6. MAIN FUNCTIONS ____________________________________________________________2  
7. PARAMETERS _______________________________________________________________2  
8. DIGITAL INPUTS _____________________________________________________________4  
9. RS485 SERIAL LINE – FOR MONITORING SYSTEMS_______________________________4  
10. X-REP OUTPUT – OPTIONAL___________________________________________________4  
11. INSTALLATION AND MOUNTING________________________________________________4  
12. ELECTRICAL CONNECTIONS __________________________________________________4  
13. HOW TO: USE THE HOT KEY___________________________________________________4  
14. ALARM SIGNALS _____________________________________________________________4  
15. TECHNICAL DATA ____________________________________________________________5  
16. CONNECTIONS ______________________________________________________________5  
17. DEFAULT SETTING VALUES ___________________________________________________5  
After defrost, there is a timed fan delay allowing for drip time, set by means of the “Fnd” parameter.  
FnC=C_Y, fans will switch ON and OFF with the compressor and run during defrost.  
FnC=o_Y, fans will run continuously also during defrost.  
An additional parameter FSt provides the setting of temperature, detected by the evaporator probe,  
above which the fans are always OFF. This is used to make sure circulation of air only if his  
temperature is lower than set in FSt.  
3.3.1 Forced activation of fans  
This function managed by the FCt parameter is designed to avoid short cycles of fans, that could  
happen when the controller is switched on or after a defrost, when the room air warms the  
evaporator. How it works: if the temperature difference between evaporator probe and room probe  
is higher than the FCt parameter value, fans will be switched on. With FCt=0 the function is disabled.  
3.3.2 Cyclical activation of the fans with compressor off.  
When FnC=C-n or C-Y (fans working in parallel with the compressor), by means of the Fon and FoF  
parameters the fans can carry out on and off cycles even if the compressor is switched off. When the  
compressor is stopped the fans go on working for the Fon time. With Fon=0 the fans remain always  
off, also when the compressor is off.  
1. GENERAL WARNING  
3.4 LIGHT RELAY CONFIGURATION (PAR. OA2; TERM. 1-2)  
1.1 PLEASE READ BEFORE USING THIS MANUAL  
The functioning of the auxiliary relay (terminals. 1-4) can be set by the oA2 parameter, according to  
the kind of application. In the following paragraph the possible setting:  
This manual is part of the product and should be kept near the instrument for easy and quick  
reference.  
3.4.1 Light relay  
The instrument shall not be used for purposes different from those described hereunder. It cannot be  
used as a safety device.  
With oA2=LiG the relay 1-2 operates as a light.  
3.4.2 Auxiliary relay  
Check the application limits before proceeding.  
Dixell Srl reserves the right to change the composition of its products, even without notice, ensuring  
the same and unchanged functionality.  
a. Relay activation by digital input 2 (oA2=AUS, i2F=AUS)  
With oA2=AUS and i2F=AUS the relay 1-2 is switched on and off by digital.  
1.2  
SAFETY PRECAUTIONS  
b. Auxiliary thermostat  
Check the supply voltage is correct before connecting the instrument.  
Anti condensing heater with the possibility of switching it on and off also by using the frontal  
keyboard.  
Do not expose to water or moisture: use the controller only within the operating limits avoiding sudden  
temperature changes with high atmospheric humidity to prevent formation of condensation  
Warning: disconnect all electrical connections before any kind of maintenance.  
Fit the probe where it is not accessible by the End User. The instrument must not be opened.  
In case of failure or faulty operation send the instrument back to the distributor or to “Dixell S.r.l.” (see  
address) with a detailed description of the fault.  
Consider the maximum current which can be applied to each relay (see Technical Data).  
Ensure that the wires for probes, loads and the power supply are separated and far enough from each  
other, without crossing or intertwining.  
Parameters involved:  
- ACH Kind of regulation for the auxiliary relay: Ht = heating; CL = cooling.  
- SAA Set point for auxiliary relay.  
- SHy Differential for auxiliary relay.  
- ArP Probe for auxiliary relay.  
- Sdd Auxiliary output off during defrost.  
In case of applications in industrial environments, the use of mains filters (our mod. FT1) in parallel  
with inductive loads could be useful.  
The differential threshold value is set by the SHY parameter.  
NOTE: Set oA2=AUS and ArP=nP (no probe for auxiliary output).  
In this case the relay 1-2 can be activated only by digital input with i1F=AUS or i2F=AUS.  
2. GENERAL DESCRIPTION  
Model XR75CH, format 32x74mm, is microprocessor based controller, suitable for applications on  
medium or low temperature ventilated refrigerating units. It has four relay outputs to control  
compressor, fan, defrost, which can be either electrical or reverse cycle (hot gas) and light  
(configurable). It could be provided with a Real Time Clock which allows programming of up to six  
daily defrost cycles, divided into holidays and workdays. A “Day and Night” function with two different  
set points is fitted for energy saving. It is also provided with up to four NTC (EU or US type) probe  
inputs. The first probe is used for temperature control. The second probe is used to control the  
defrost termination temperature at the evaporator. One of the two digital inputs can operate as third  
temperature probe. The fourth probe is used to control the condenser temperature (for condenser  
alarm management) or to display a temperature.  
The RS485 serial output allows connecting the unit to a network line (ModBUS-RTU compatible)  
such as any dIXEL monitoring units of X-WEB family. The HOT-KEY receptacle allows  
programming the controller by using the HOTKEY programming device.  
The instrument is fully configurable through special parameters that can be easily programmed  
through the frontal keyboard.  
3.4.3 On/off relay (oA2 = onF)  
When oA2=onF, the relay is activated when the controller is turned on and de-activated when the  
controller is turned off.  
3.4.4 Neutral zone regulation  
With oA2 = db the relay 1-2 can control a heater element to perform a neutral zone action.  
oA2 cut in = [SET-HY]  
oA2 cut out = SET  
3.4.5 Alarm relay  
With oA2 = ALr the relay 1-2 operates as alarm relay. It is activated every time an alarm happens.  
Its status depends on the tbA parameter: if tbA=Y, the relay is silenced by pressing any key.  
If tbA=n, the alarm relay remains on until the alarm condition recovers.  
3.4.6 Night blind management during energy saving cycles  
With oA2=HES, the relay 1-2 operates to manage the night blind: the relay is energised when the  
energy saving cycle is activated by digital input, frontal button or RTC (optional).  
3. CONTROLLING LOADS  
3.1 COMPRESSOR  
4. FRONT PANEL COMMANDS  
The regulation is performed according  
to the temperature measured by the  
thermostat probe with  
a
positive  
differential (HY) over the set point: if the  
temperature increases and reaches set  
point plus differential, the compressor  
will start. It will turn off as soon as the  
temperature reaches the set point value  
again.  
In case of fault in the thermostat probe the start and stop of the compressor are timed through  
parameters Con and CoF.  
To display target set point; in programming mode it selects a parameter or confirm  
an operation.  
3.2 DEFROST  
Two defrost modes are available through the “tdF” parameter: defrost through electrical heater (tdF  
= EL) and hot gas defrost (tdF = in).  
(DEF) To start a manual defrost.  
The defrost interval depends on the presence of the RTC (optional). The internal RTC is controlled  
by means of the EdF parameter:  
(UP) To see the max stored temperature; in programming mode it browses the  
parameter codes or increases the displayed value.  
-
EdF=in, the defrost is made every idF time – standard way for controller without RTC.  
1592038060 XR75CH GB r1.0 25.02.2015  
XR75CH  
1/6  
       
AC  
rtr  
Anti-short cycle delay: (0 to 50min) minimum interval between the compressor stop  
and the following restart.  
Percentage of the second and first probe for regulation: (0 to 100; 100=P1, 0=P2)  
it allows to set the regulation according to the percentage of the first and second probe,  
as for the following formula (rtr(P1-P2)/100 + P2).  
Compressor ON time during continuous cycle: (0.0 to 24h00min, res. 10min) allows  
to set the length of the continuous cycle. Compressor stays on without interruption  
during CCt time. This is useful, for instance, when the room is filled with new products.  
Set point for continuous cycle: (-50 to 110°C; (-58 to 230°F) it sets the set point  
used during the continuous cycle.  
Compressor ON time with faulty probe: (0 to 255min) time during which the  
compressor is active in case of faulty thermostat probe. With Con=0 compressor is  
always OFF.  
SAA  
SHY  
Set Point for auxiliary relay: (-50 to 110.0°C; -58 to 230°F) it defines the room  
temperature set point to switch auxiliary relay.  
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.  
CCt  
ArP  
Sdd  
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.  
Auxiliary relay off during defrost: (n; Y) n = the auxiliary relay operates during  
defrost.  
CCS  
Con  
Y = the auxiliary relay is switched off during defrost.  
ALARMS  
ALP  
CoF  
Compressor OFF time with faulty probe: (0 to 255min) time during which the  
compressor is OFF in case of faulty thermostat probe. With CoF=0 compressor is  
always active.  
Probe selection for alarm: (nP; P1; P2; P3; P4) nP = no probe, the temperature  
alarms are disabled; P1 = Probe 1 (Thermostat probe); P2 = Probe 2 (evaporator  
probe);  
DISPLAY  
CF  
P3 = Probe 3 (display probe); P4 = Fourth probe.  
Temperature measurement 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).  
ALC  
Temperature alarms 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.  
rES  
Lod  
Resolution (for °C): (in=1°C; dE=0.1°C) allows decimal point display.  
Instrument display: (P1; P2, P3, P4, SET, dtr) it selects which probe is displayed by  
the instrument. P1 = Thermostat probe; P2 = Evaporator probe; P3 = Third probe (only  
for model with this option enabled); P4 = Fourth probe, SET = set point; dtr =  
percentage of visualization.  
X-REP display (optional): (P1; P2, P3, P4, SET, dtr) it selects which probe is  
displayed by X- REP. P1 = Thermostat probe; P2 = Evaporator probe; P3 = Third probe  
(only for model with this option enabled); P4 = Fourth probe, SET = set point;  
dtr = percentage of visualization.  
Display delay: (0 to 20min00s; res. 10s) when the temperature increases, the display  
is updated of 1°C or 1°F after this time.  
Percentage of the second and first probe for visualization when Lod=dtr: (0 to 99;  
100=P1, 0=P2) if Lod=dtr it allows to set the visualization according to the percentage  
of the first and second probe, as for the following formula (dtr(P1-P2)/100 + P2).  
ALU  
ALL  
AFH  
ALd  
dAo  
MAXIMUM temperature alarm: (ALL to 110°C; ALL to 230°F) when this temperature  
is reached the alarm is enabled, after the ALd delay time.  
Minimum temperature alarm: (-50°C to ALU; -58 to ALU) when this temperature is  
reached the alarm is enabled, after the ALd delay time.  
Differential for temperature alarm recovery: (0.1 to 25.5°C; 1 to 45°F) intervention  
differential for recovery of temperature alarm.  
Temperature alarm delay: (0 to 255 min) time interval between the detection of an  
alarm condition and alarm signalling.  
rEd  
Exclusion of temperature alarm 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.  
dLY  
dtr  
CONDENSER TEMPERATURE ALARM  
AP2  
Probe selection for temperature alarm 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.  
DEFROST  
EdF  
Defrost mode (only for controller with RTC): (rtC; in) rtC = Real Time Clock mode.  
Defrost time follows Ld1 to Ld6 parameters on workdays and Sd1 to Sd6 on holidays.  
in = interval mode. The defrost starts when the time idF is expired.  
Defrost type: (EL; in) EL = electrical heater; in = hot gas.  
Probe selection for defrost termination: (nP; P1; P2; P3; P4) nP = no probe;  
P1 =thermostat probe; P2 = evaporator probe; P3 =configurable probe; P4 = Probe on  
Hot Key plug.  
Defrost termination temperature: (-50 to 50°C; -58 to 122°F) (enabled only when  
EdF=Pb) sets the temperature measured by the evaporator probe, which causes the  
end of defrost.  
Interval between defrost cycles: (0 to 120hours) determines the interval of time  
between two defrost cycles.  
(Maximum) 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.  
Start defrost delay: (0 to 99min) this is useful when different defrost start times are  
necessary to avoid overloading the plant.  
Temperature displayed during defrost: (rt; it; SEt; dEF) rt = real temperature;  
it = temperature at defrost start; SEt = set point; dEF = “dEF” label.  
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.  
Drip time: (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.  
First defrost after start-up: (n; Y) n = after the idF time, Y = immediately.  
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.  
AL2  
Au2  
Low temperature alarm of condenser: (-50 to 110°C; -58 to 230°F) when this  
temperature is reached the LA2 alarm is signalled, possibly after the Ad2 delay.  
High temperature alarm of condenser: (-50 to 110°C; -58 to 230°F) when this  
temperature is reached the HA2 alarm is signalled, possibly after the Ad2 delay.  
Differential for temperature condenser alarm recovery: 0.1 to 25.5°C; 1 to 45°F  
Condenser temperature alarm delay: (0 to 255 min) time interval between the  
detection of the condenser alarm condition and alarm signalling.  
tdF  
dFP  
AH2  
Ad2  
dtE  
dA2  
bLL  
Condenser temperature alarm exclusion at start up: 0.0 to 24h00min, res. 10min.  
Compressor off with low temperature alarm of condenser: (n; Y)  
n
=
no:  
compressor keeps on working; Y = yes, compressor is switched off till the alarm is  
present, in any case regulation restarts after AC time at minimum.  
Compressor off with high temperature alarm of condenser: (n; Y) n = no:  
compressor keeps on working; Y = yes, compressor is switched off till the alarm is  
present, in any case regulation restarts after AC time at minimum.  
idF  
AC2  
MdF  
AUXILIARY RELAY  
dSd  
dFd  
dAd  
Fdt  
tbA  
Alarm relay silencing (with oA2 =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.  
Second relay configuration (1-2): (dEF; FAn; ALr; LiG; AUS; onF; db; CP2; 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; CP2 = do not select it;  
dEF2 = do not select it; HES = night blind.  
Alarm relay polarity: (CL; oP) it set if the alarm relay is open or closed when an alarm  
occurs. CL = terminals 1-2 closed during an alarm; oP = terminals 1-2 open during an  
alarm.  
oA2  
AoP  
dPo  
dAF  
DIGITAL INPUTS  
FANS  
FnC  
i1P  
i1F  
i2P  
i2F  
Digital input polarity (18-20): (oP; CL) oP = the digital input is activated by opening  
Fans operating mode: (C-n; o-n; C-Y; o-Y) C-n = runs with the compressor, OFF  
during defrost; o-n = continuous mode, OFF during defrost; C-Y = runs with the  
compressor, ON during defrost; o-Y = continuous mode, ON during defrost.  
Fans delay after defrost: (0 to 255min) interval between end of defrost and evaporator  
fans start.  
Temperature differential to avoid fan short cycles: (0 to 59°C; 0 to 90°F) (N.B.: if  
FCt=0 function disabled) if the difference of temperature between the evaporator and  
the room probes is higher than FCt value, the fans will be switched on.  
Fans stop temperature: (-50 to 50°C; -58 to 122°F) setting of temperature, detected  
by evaporator probe, above which fans are always OFF.  
Fan ON time: (0 to 15min) with Fnc=C_n or C_Y, (fan activated in parallel with  
compressor) it sets the evaporator fan ON cycling time when the compressor is off.  
With Fon=0 and FoF≠0 the fan are always off, with Fon=0 and FoF=0 the fan are  
always off.  
Fan OFF time: (0 to 15min)  
With FnC=C_n or C_Y, (fan activated in parallel with compressor) it sets the evaporator  
the contact; CL = the digital input is activated by closing the contact.  
Digital input configuration (18-20): (dor; dEF) dor = door switch function;  
dEF = activation of a defrost cycle;  
Fnd  
Fct  
Second digital input polarity (18-19): (oP; CL) oP = the digital input is activated by  
opening the contact; CL = the digital input is activated by closing the contact.  
Second digital input configuration (18-19): (EAL; bAL; PAL; dor; dEF; ES; AUS; Htr;  
FAn; HdF; onF) 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.  
Digital input alarm delay (18-20) when i2F=EAL or i2F=bAL: (0 to 255 min) delay  
between the detection of the external alarm condition and its signalling.  
When i2F= PAL, it is the interval of time to calculate the number of pressure switch  
activation.  
Door open signalling delay: 0 to 255 min.  
Number of pressure switch activation: (0 to 15) Number of activation, during the did  
interval, before signalling an alarm event (i2F=PAL).  
If the nPS activation during did time is reached, switch off and on the instrument to  
restart normal regulation.  
Compressor status when open door: (no; FAn; CPr;F_C;) no = normal;  
FAn = normal; CPr = compressor OFF, F_C = compressor OFF.  
Outputs restart after doA alarm: (n; Y) n = outputs not affected by the doA alarm;  
Y = outputs restart with the doA alarm.  
FSt  
Fon  
did  
FoF  
FAP  
fan off cycling time when the compressor is off.  
With Fon=0 and FoF≠0 the fan are always off, with Fon=0 and FoF=0 the fan are  
always off.  
Probe selection for fan management: (nP; P1; P2; P3; P4) nP = no probe;  
P1 =thermostat probe; P2 = evaporator probe; P3 =configurable probe; P4 = Probe on  
Hot Key plug.  
doA  
nPS  
odc  
rrd  
AUXILIARY THERMOSTAT CONFIGURATION (terms. 1-2) – oA2 = AUS  
ACH Kind of regulation for auxiliary relay: (Ht; CL) Ht = heating; CL = cooling.  
1592038060 XR75CH GB r1.0 25.02.2015  
XR75CH  
3/6  
HES  
Delta temperature 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.  
8.8 ENERGY SAVING (i2F = ES)  
The Energy Saving function allows to change the set point value as the result of the [SET+HES]  
(parameter) sum. This function is enabled until the digital input is activated.  
RTC SETTINGS (ONLY FOR MODELS WITH RTC)  
Hur  
Min  
dAY  
Hd1  
Current hour: 0 to 23hours  
Current minute: 0 to 59min  
Current day: SUn to SAt  
First weekly holiday: (SUn to nU) set the first day of the week which follows the  
holiday times. nU = not used.  
8.9 HOLIDAY DEFROST (i2F = HDF) –ONLY FOR MODELS WITH RTC  
This function enabled the holiday defrost setting.  
8.10 ON OFF FUNCTION (i2F = onF)  
Hd2  
Second weekly holiday: (SUn to nU) set the second day of the week which follows the  
holiday times. nU = not used.  
To switch the controller on and off.  
8.11 DIGITAL INPUTS POLARITY  
ENERGY SAVING SETTINGS (ONLY FOR MODELS WITH RTC)  
The digital input polarity depends on the i1P and i2P parameters.  
iLE  
Energy Saving cycle start during workdays: (0.0 to 24h00min, res. 10min) during the  
Energy Saving cycle the set point is increased by the value in HES so that the  
operation set point is [SET+HES].  
i1P or i2P=CL, the input is activated by closing the contact.  
i1P or i2P=OP, the input is activated by opening the contact.  
dLE  
Energy Saving cycle length during workdays: (0.0 to 24h00min, res. 10min) sets the  
duration of the Energy Saving cycle on workdays.  
Energy Saving cycle start on holidays: 0.0 to 23h50min, res. 10min.  
Energy Saving cycle length on holidays 0.0 to 24h00min, res. 10min.  
9. RS485 SERIAL LINE – FOR MONITORING SYSTEMS  
The RS485 serial line allows to connect the instrument to a monitoring system (ModBUS-RTU  
compatible) such as the X-WEB500/3000/300.  
iSE  
dSE  
10. X-REP OUTPUT – OPTIONAL  
DEFROSTING TIMES SETTINGS (ONLY FOR MODELS WITH RTC)  
As optional, an X-REP can be connected to the instrument, trough the dedicated connector.  
Ld1 to Ld6  
Sd1 to Sd6  
Start defrosts during workdays: (0.0 to 23h 50min, res. 10min) these  
parameters set the beginning of the 6 programmable defrost cycles during  
workdays. E.g.: when Ld2=12.4, the second defrost starts at 12.40 during  
workday time.  
Start defrosts during holydays: (0.0 to 23h50min, res. 10min) these  
parameters set the beginning of the 6 programmable defrost cycles on  
holidays. E.g.: when Sd2=3.4 the second defrost starts at 3.40 during holiday  
time.  
To connect the X-REP to the instrument the  
following connectors must be used CAB-  
51F(1m), CAB-52F(2m), CAB-55F(5m),  
11. INSTALLATION AND MOUNTING  
N.B.: to disable a defrost cycle set it to “nU” (not used). E.g.: if Ld6=nU, the  
sixth defrosting cycle is disabled.  
Instrument XR75CH shall be mounted on vertical panel, in a  
29x71 mm hole, and fixed using the special bracket supplied.  
The temperature range allowed for correct operation is 0 to 60°C.  
Avoid places subject to strong vibrations, corrosive gases,  
excessive dirt or humidity. The same recommendations apply to  
probes. Let air circulate by the cooling holes.  
OTHER  
Adr  
Serial address: (1 to 247) identifies the instrument address when connected to a  
ModBUS compatible monitoring system.  
Type of probe: (ntC, CtC) it allows to set the kind of probe used by the instrument:  
ntC = NTC-EU probe, CtC = NTC-US probe.  
On/Off key enabling: (nU; oFF; ES) nU = disabled; oFF = enabled; ES = not set it.  
Thermostat probe display.  
Evaporator probe display.  
Third probe display- optional.  
Fourth probe display.  
PbC  
onF  
dP1  
dP2  
dP3  
dP4  
rSE  
12. ELECTRICAL CONNECTIONS  
The instrument is provided with screw terminal block to connect cables with a cross section up to  
2.5mm2. Before connecting cables make sure the power supply complies with the instrument’s  
requirements. Separate the probe cables from the power supply cables, from the outputs and the  
power connections. Do not exceed the maximum current allowed on each relay, in case of heavier  
loads use a suitable external relay.  
Real set point: it shows the set point used during the energy saving cycle or during the  
continuous cycle.  
Software release for internal use.  
rEL  
Ptb  
Parameter table code: readable only.  
12.1 PROBE CONNECTION  
The probes shall be mounted with the bulb upwards to prevent damages due to casual liquid  
infiltration. It is recommended to place the thermostat probe away from air streams to correctly  
measure the average room temperature. Place the defrost termination probe among the evaporator  
fins in the coldest place, where most ice is formed, far from heaters or from the warmest place during  
defrost, to prevent premature defrost termination.  
8. DIGITAL INPUTS  
The first digital input 18-20 is enabled with P3P=n.  
With P3P=n and i1F=i2F the second digital input is disabled.  
The free voltage digital inputs are programmable by the i1F and i2F parameters.  
8.1 GENERIC ALARM (i2F = EAL)  
13. HOW TO: USE THE HOT KEY  
As soon as the digital input is activated the unit will wait for did time delay before signalling the “EAL”  
alarm message. The outputs status doesn’t change. The alarm stops just after the digital input is de-  
activated.  
13.1 PROGRAM A HOT KEY FROM AN INSTRUMENT (UPLOAD)  
1.  
2.  
Program one controller with the front keypad.  
When the controller is ON, insert the “HOT-KEY” and push UP button; the “uPL” message  
appears followed a by a flashing “End” label.  
8.2 SERIOUS ALARM MODE (i2F = bAL)  
3.  
4.  
Push SET button and the “End” will stop flashing.  
Turn OFF the instrument, remove the “HOT-KEY” and then turn it ON again.  
When the digital input is activated, the unit will wait for did delay before signalling the “CA” alarm  
message. The relay outputs are switched OFF. The alarm will stop as soon as the digital input is de-  
activated.  
NOTE: the “Err” message appears in case of a failed programming operation. In this case push  
again button if you want to restart the upload again or remove the “HOT-KEY” to abort the operation.  
8.3 PRESSURE SWITCH (i2F = PAL)  
If during the interval time set by did parameter, the pressure switch has reached the number of  
activation of the nPS parameter, the “CA” pressure alarm message will be displayed. The  
compressor and the regulation are stopped. When the digital input is ON the compressor is always  
OFF. If the nPS activation during did time is reached, switch off and on the instrument to  
restart normal regulation.  
13.2 PROGRAM AN INSTRUMENT BY USING A HOT KEY (DOWNLOAD)  
1.  
2.  
Turn OFF the instrument.  
Insert a pre-programmed “HOT-KEY” into the 5-PIN receptacle and then turn the Controller  
ON.  
3.  
The parameter list of the “HOT-KEY” will be automatically downloaded into the Controller  
memory. The “doL” message will blink followed a by a flashing “End” label.  
After 10 seconds the instrument will restart working with the new parameters.  
Remove the “HOT-KEY”.  
8.4 DOOR SWITCH INPUT (i1F or i2F = dor)  
4.  
5.  
It signals the door status and the corresponding relay output status through the odC parameter:  
no = normal (any change); FAn = Fan OFF; CPr = Compressor OFF; F_C = Compressor and fan  
OFF. Since the door is opened, after the delay time set through parameter doA, the door alarm is  
enabled, the display shows the message dA and the regulation restarts is rtr=Y. The alarm stops as  
soon as the external digital input is disabled again. With the door open, the high and low temperature  
alarms are disabled.  
NOTE: the message “Err” is displayed for failed programming. In this case turn the unit off and then  
on if you want to restart the download again or remove the “HOT-KEY” to abort the operation.  
14. ALARM SIGNALS  
8.5 START DEFROST (i1F or i2F = dEF)  
Message  
“P1”  
“P2”  
“P3”  
“P4”  
“HA”  
“LA”  
"HA2"  
"LA2"  
“dA”  
Cause  
Room probe failure  
Evaporator probe failure  
Third probe failure  
Fourth probe failure  
Maximum temperature alarm  
Minimum temperature alarm  
Condenser high temperature  
Condenser low temperature  
Door open  
Outputs  
Compressor output acc. to par. Con and CoF  
Defrost end is timed  
Outputs unchanged  
Outputs unchanged  
Outputs unchanged.  
Outputs unchanged.  
It depends on the AC2 parameter  
It depends on the bLL parameter  
Compressor restarts  
It starts a defrost if there are the right conditions. After the defrost is finished, the normal regulation  
will restart only if the digital input is disabled otherwise the instrument will wait until the MdF safety  
time is expired.  
8.6 SWITCH THE AUXILIARY RELAY (i2F = AUS)  
With oA2=AUS the digital input switched the status of the auxiliary relay.  
8.7 INVERSION OF THE KIND OF ACTION: HEATING-COOLING (i2F = Htr)  
This function allows to invert the regulation of the controller: from cooling to heating and viceversa.  
“EA”  
External alarm  
Output unchanged.  
“CA”  
“CA”  
Serious external alarm (i2F=bAL) All outputs OFF.  
Pressure switch alarm (i2F=PAL) All outputs OFF  
1592038060 XR75CH GB r1.0 25.02.2015  
XR75CH  
4/6  
             
Label  
Name  
Range  
[-12.0 to 12.0°C]  
[-21 to 21°F]  
n=not present; Y=pres.  
[-12.0 to 12.0°C]  
[-21 to 21°F]  
0 to 255 min  
0 to 50 min  
0 to 100 (100=P1 , 0=P2)  
0.0 to 24h 00min, res. 10min  
[-50 to 110.0°C]  
[-58 to 230°F]  
Value  
[0.0°C]  
[0°F]  
n
[0.0°C]  
[0°F]  
0
1
100  
0.0  
Level  
Pr2  
Message  
“rtC”  
Cause  
Real time clock alarm  
Outputs  
Alarm output ON; Other outputs unchanged;  
Defrosts according to par. idF.  
Set real time clock has to be set.  
Alarm output ON; Other outputs unchanged;  
Defrosts according to par. idF. Contact the  
service.  
o3 Third probe calibration  
P4P Fourth probe presence  
Pr2  
o4 Fourth probe calibration  
Pr2  
rtF  
Real time clock board failure  
odS Outputs delay at start up  
AC Anti-short cycle delay  
rtr P1-P2 percentage for regulation  
CCt Continuous cycle duration  
Pr2  
Pr1  
Pr2  
Pr2  
14.1 SILENCING BUZZER / ALARM RELAY OUTPUT  
[-5°C]  
[23°F]  
15  
CCS Set point for continuous cycle  
Pr2  
If tbA=Y, the buzzer and the relay are is silenced by pressing any key.  
If tbA=n, only the buzzer is silenced while the alarm relay is on until the alarm condition recovers.  
Con Compressor ON time with faulty probe  
CoF Compressor OFF time with faulty probe  
0 to 255 min  
0 to 255 min  
Pr2  
Pr2  
30  
14.2 ALARM RECOVERY  
[°C]  
[°F]  
dE  
P1  
P1  
0.0  
50  
rtC  
EL  
CF Temperature measurement unit  
°C; °F  
Pr2  
Probe alarms “P1”, “P2”, “P3” and “P4” start some seconds after the fault in the related probe; they  
automatically stop some seconds after the probe restarts normal operation. Check connections  
before replacing the probe.  
Temperature alarms “HA”, “LA” “HA2” and “LA2” automatically stop as soon as the temperature  
returns to normal values.  
Alarms “EA” and “CA” (with i2F=bAL) recover as soon as the digital input is disabled.  
Alarm “CA” (with i2F=PAL) recovers only by switching off and on the instrument  
rES Resolution  
Lod Probe displayed  
rEd2 X-REP display  
dLY Display temperature delay  
dtr P1-P2 percentage for display  
EdF* Kind of interval for defrost  
tdF Defrost type  
in=integer; dE= dec.point  
P1; P2  
P1; P2; P3; P4; SEt; dtr  
0.0 to 20min 00s, res. 10s  
1 to 99  
Pr1  
Pr2  
Pr2  
Pr2  
Pr2  
Pr2  
Pr1  
Pr2  
rtC; in  
EL=el. heater; in= hot gas  
nP; P1; P2; P3; P4  
[-50 to 50°C]  
dFP Probe selection for defrost termination  
P2  
[8°C]  
[46°F]  
6
30  
0
it  
30  
0
n
0.0  
o-n  
10  
[10°C]  
[10°F]  
[36°C]  
[23°F]  
0
0
P2  
CL  
[0.0°C]  
[32°F]  
[2.0°C]  
[2°F]  
nP  
14.3 OTHER MESSAGES  
dtE Defrost termination temperature  
Pr1  
[-50 to 122°F]  
1 to 120 hours  
0 to 255 min  
0 to 99 min  
rt, it, SEt, DEF  
0 to 255 min  
Pon Keyboard unlocked.  
PoF Keyboard locked  
noP In programming mode: no parameter present in Pr1.  
On the display or in dP2, dP3, dP4: the selected probe is not enabled.  
idF Interval between defrost cycles  
MdF (Maximum) length for defrost  
dSd Start defrost delay  
dFd Displaying during defrost  
dAd MAX display delay after defrost  
Fdt Draining time  
dPo First defrost after start-up  
dAF Defrost delay after fast freezing  
FnC Fan operating mode  
Pr1  
Pr1  
Pr2  
Pr2  
Pr2  
Pr2  
Pr2  
Pr2  
Pr1  
Pr1  
0 to 120 min  
15. TECHNICAL DATA  
Housing: self extinguishing ABS  
Case: frontal 38x80mm; depth 62mm  
Mounting: panel mounting in a 71x29mm panel cut-out  
Protection: IP20; Frontal protection: IP65  
Connections: Screw terminal block 2.5 mm2 wiring  
Power supply: (according to the model) 24Vac, ±10%; 230Vac 10%, 50/60Hz;  
110Vac 10%, 50/60Hz.  
Power absorption: 3VA max  
Display: 3 digits, red LEDs, 14.2 mm high. Inputs: Up to 4 NTC-EU or NTC-US probes  
Digital inputs: free voltage contact.  
n=after idF; Y=immed.  
0 to 24h 00min, res. 10min  
C-n; o-n; C-Y; o-Y  
0 to 255 min  
[0 to 50°C]  
[0 to 90°F]  
[-50 to 50°C]  
[-58 to 122°F]  
0 to 15 min  
0 to 15 min  
nP; P1; P2; P3; P4  
CL; Ht  
[-50 to 110°C]  
[-58 to 230°F]  
[0.1 to 25.5°C]  
[1 to 45°F]  
nP; P1; P2; P3; P4  
n; Y  
nP; P1; P2; P3; P4  
rE= related to set;  
Ab = absolute  
[SEt to 110.0°C]  
[SEt to 230°F]  
[-50°C to SEt]  
Fnd Fan delay after defrost  
Differential of temperature to force fan  
FCt  
Pr2  
Pr1  
activation  
FSt Fan stop temperature  
Fon Fan on time with compressor off  
FoF Fan off time with compressor off  
FAP Probe selection for fan management  
ACH Kind of action for auxiliary relay  
Pr2  
Pr2  
Pr2  
Pr2  
Relay outputs:  
SAA Set Point for auxiliary relay  
Pr2  
Pr2  
Compressor: SPST 8(3)A, 250Vac or SPST 16A 250Vac  
Defrost: SPDT 8(3)A, 250Vac  
Aux: SPST 5A, 250Vac  
SHY Differential for auxiliary relay  
ArP Probe selection for auxiliary relay  
Sdd Auxiliary relay operating during defrost  
ALP Alarm probe selection  
Pr2  
Pr2  
Pr2  
Fan: SPDT 8(3)A, 250Vac or SPST 16(6)A 250Vac  
Data storing: on the non-volatile memory (EEPROM)  
Internal clock back-up: 24 hours  
Kind of action: 1B. Pollution degree: 2. Software class: A  
Rated impulsive voltage: 2500V. Overvoltage Category: II  
Operating temperature: 0 to 55°C (32 to 131°F)  
Storage temperature: -30 to 85°C (-22 to 185°F)  
Relative humidity: 20 to 85% (no condensing)  
Measuring and regulation range:  
n
P1  
ALC Temperat. alarms configuration  
ALU MAXIMUM temperature alarm  
ALL Minimum temperature alarm  
Ab  
Pr2  
Pr1  
Pr1  
Pr2  
[110°C]  
[230°F]  
[-50.0°C]  
[-58°F]  
[2.0°C]  
[2°F]  
[-58°F to SEt]  
[0.1°C to 25.5°C]  
[1°F to 45°F]  
AFH Differential for temperat. alarm recovery  
NTC-EU probe (10k ±1%, β=3435): -40 to 110°C (-40 to 230°F)  
NTC-US probe (xxk ±y%, β=????): -40 to 110°C (-40 to 230°F)  
Resolution: 0.1°C or 1°C or 1°F (selectable)  
Accuracy (ambient temp. 25°C): ±0.7°C ±1 digit  
ALd Temperature alarm delay  
dAo Delay of temperature alarm at start up  
AP2 Probe for temperat. alarm of condenser  
0 to 255 min  
15  
1.3  
P4  
[-40.0°C]  
[-40°F]  
[110°C]  
[230°F]  
[5°C]  
Pr2  
Pr2  
Pr2  
0 to 24h 00min, res. 10min  
nP; P1; P2; P3; P4  
[-50 to 110°C]  
[-58 to 230°F]  
AL2 Condenser for low temperat. alarm  
Pr2  
Pr2  
Pr2  
[-50 to 110°C]  
[-58 to 230°F]  
[0.1°C to 25.5°C]  
[1°F to 45°F]  
16. CONNECTIONS  
AU2 Condenser for high temperat. alarm  
Differential for condenser temperature alarm  
recovery  
AH2  
[5°F]  
Ad2 Condenser temperature alarm delay  
dA2 Delay of cond. temper. alarm at start up  
0 to 254 min, 255=nU  
0.0 to 24h 00min, res. 10min  
15  
1.3  
Pr2  
Pr2  
Compr. off for condenser low temperature  
alarm  
Compressor off because of condenser high  
temperature alarm  
bLL  
n; Y  
n; Y  
n
Pr2  
AC2  
n
Pr2  
Pr2  
tbA Alarm relay disabling  
n; Y  
ALr = alarm;  
Y
dEF = do not select it;  
LiG =Light;  
AUS =AUX;  
onF=always on;  
FAn= do not select it;  
db = neutral zone;  
CP2 = second compressor;  
dF2 = do not select it;  
HES = night blind  
oP; CL  
oP=opening; CL=closing  
dor; dEF;  
oP=opening; CL=closing  
EAL; bAL; PAL; dor; dEF; ES; AUS;  
Htr; FAn; HdF; onF  
0 to 255 min  
oA2 Second relay configuration  
LiG  
Pr2  
Supply: 120Vac: connect to terminals 5-6.  
The X-REP output is optional  
AoP Alarm relay polarity (oA2=ALr)  
i1P Digital input polarity (18-20)  
i1F Digital input 1 configuration (18-20)  
i2P Digital input polarity (18-19)  
CL  
CL  
dor  
CL  
Pr2  
Pr1  
Pr1  
Pr2  
17. DEFAULT SETTING VALUES  
Label  
Name  
Range  
Value  
[-5.0°C]  
[23°F]  
-
[2.0°C]  
[2°F]  
[-50.0°C]  
[-58°F]  
[110.0°C]  
[230°F]  
[0.0°C]  
[0°F]  
Level  
- - -  
i2F Digital input configuration (18-19)  
EAL  
Pr2  
SEt Set point  
LS to US  
did Digital input alarm delay (18-20)  
doA Door open alarm delay  
NPS Number of activation of pressure switch  
odC Compress and fan status when open door  
rrd Regulation restart with door open alarm  
15  
15  
15  
F-C  
Y
Pr1  
Pr1  
Pr2  
Pr2  
Pr2  
0 to 255 min  
0 to 15  
no; FAn; CPr; F_C  
n; Y  
[-30°C to 30°C]  
[-54°F to 54°F]  
0 to 23  
0 to 59  
Sun to SAt  
Sun to Sat; nU  
rtC* Real time clock menu  
-
Pr1  
[0.1 to 25.5°C]  
[1 to 255°F]  
HY Differential  
Pr1  
[-50°C to SET]  
[-58°F to SET]  
[SET to 110°C]  
[SET to 230°F]  
[-12 to 12°C]  
[-21 to 21°F]  
n=not present; Y=pres.  
[-12 to 12°C]  
LS Minimum set point  
Pr2  
Pr2  
HES Differential for Energy Saving  
0
Pr2  
US Maximum set point  
HUr* Current hour  
Min* Current minute  
dAY* Current day  
Hd1* First weekly holiday  
Hd2* Second weekly holiday  
iLE* Energy Saving cycle start during workdays  
dLE* Energy Saving cycle length during workdays  
iSE* Energy Saving cycle start on holidays  
-
-
-
Pr1  
Pr1  
Pr1  
Pr1  
Pr1  
Pr1  
Pr1  
Pr1  
ot  
Thermostat probe calibration  
Pr1  
Pr1  
Pr2  
Pr2  
P2P Evaporator probe presence  
oE Evaporator probe calibration  
P3P Third probe presence  
Y
nU  
nU  
0.0  
0
[0.0°C]  
[0°F]  
n
Sun to Sat; nU  
[-21 to 21°F]  
n=not present; Y=pres.  
0 to 23h50min, res. 10min  
0 to 24h 00min, res. 10min  
0 to 23h 50min, res. 10min  
0.0  
1592038060 XR75CH GB r1.0 25.02.2015  
XR75CH  
5/6  
     
Label  
Name  
Range  
0 to 24h 00min, res. 10min  
0 to 23h 50min, res. 10min; nU  
0 to 23h 50min, res. 10min; nU  
0 to 23h 50min, res. 10min; nU  
0 to 23h 50min, res. 10min; nU  
0 to 23h 50min, res. 10min; nU  
0 to 23h 50min, res. 10min; nU  
0 to 23h 50min, res. 10min; nU  
0 to 23h 50min, res. 10min; nU  
0 to 23h 50min, res. 10min; nU  
0 to 23h 50min, res. 10min; nU  
0 to 23h 50min, res. 10min; nU  
0 to 23h 50min, res. 10min; nU  
Value  
0
Level  
Pr1  
Pr1  
Pr1  
Pr1  
Pr1  
Pr1  
Pr1  
Pr1  
Pr1  
Pr1  
Pr1  
Pr1  
Pr1  
Pr2  
Pr2  
Pr2  
Pr1  
Pr1  
Pr1  
Pr1  
Pr2  
Pr2  
Pr2  
dSE* Energy Saving cycle length on holidays  
Ld1* 1st workdays defrost start  
Ld2* 2nd workdays defrost start  
Ld3* 3rd workdays defrost start  
Ld4* 4th workdays defrost start  
Ld5* 5th workdays defrost start  
Ld6* 6th workdays defrost start  
Sd1* 1st holiday defrost start  
Sd2* 2nd holiday defrost start  
Sd3* 3rd holiday defrost start  
Sd4* 4th holiday defrost start  
Sd5* 5th holiday defrost start  
Sd6* 6th holiday defrost start  
Adr Serial address  
6.0  
13.0  
21.0  
nU  
nU  
nU  
6.0  
13.0  
21.0  
nU  
nU  
nU  
1
1 to 247  
ntC; CtC  
nU, oFF; ES  
PbC Kind of probe  
onF on/off key enabling  
ntC  
nU  
-
-
-
dP1 Room probe display  
dP2 Evaporator probe display  
dP3 Third probe display  
dP4 Fourth probe display  
rSE Real set  
--  
--  
--  
--  
-
-
actual set  
--  
--  
rEL Software release  
Ptb Map code  
5.6  
-
* Only for model with real time clock  
2 Only for XR75CH with X-REP output  
1592038060 XR75CH GB r1.0 25.02.2015  
XR75CH  
6/6  

Sony Dc Fx1 User Manual
Philips Universal Charger Scb2100nb User Manual
Philips Sbc Sc469 User Manual
Panasonic Cw C60yu User Manual
LG 27MP40A User Manual
KENWOOD MAJOR KM600 User Manual
HITACHI 60SBX78B User Manual
EPSON 1060 02 User Manual
DELL SD7000 S User Manual
CRAFTSMAN 151.30378 User Manual