Emerson Dixell XR44CH Wiring diagram

xxxxxxxxxxxxxxxxxx XR44CH ISA GB r1.6 21.11.2016 XR44CH 1/5
Digital controller with defrost and fan management
XR44CH
1. GENERAL WARNING__________________________________________________________1
2. GENERAL DESCRIPTION ______________________________________________________1
3. CONTROLLING LOADS ________________________________________________________1
4. FRONT PANEL COMMANDS____________________________________________________2
5. MAX & MIN TEMPERATURE MEMORIZATION _____________________________________2
6. DUAL TEMPERATURE FUNCTION_______________________________________________2
7. MAIN FUNCTIONS ____________________________________________________________2
8. PARAMETERS _______________________________________________________________3
9. DIGITAL INPUTS _____________________________________________________________4
10. TTL SERIAL LINE –FOR MONITORING SYSTEMS _________________________________4
11. INSTALLATION AND MOUNTING ________________________________________________4
12. ELECTRICAL CONNECTIONS___________________________________________________4
13. USE THE HOT KEY ___________________________________________________________4
14. ALARM SIGNALS _____________________________________________________________4
15. TECHNICAL DATA ____________________________________________________________5
16. CONNECTIONS ______________________________________________________________5
17. DEFAULT SETTING VALUES ___________________________________________________5
1. GENERAL WARNING
1.1 PLEASE READ BEFORE USING THIS MANUAL
This manual is part of the product and should be kept near the instrument for easy and quick
reference.
The instrument shall not be used for purposes different from those described hereunder. It
cannot be used as a safety device.
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.
1.2 SAFETY PRECAUTIONS
Check the supply voltage is correct before connecting the instrument.
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.
In case of applications in industrial environments, the use of mains filters (our mod. FT1) in
parallel with inductive loads could be useful.
2. GENERAL DESCRIPTION
Model XR44CH, format 32 x 74 mm, is microprocessor based controller, suitable for applications on
low temperature refrigerating units. It has four relay outputs to control compressor 1 and 2, defrost 1
and 2, which can be either electrical or reverse cycle (hot gas). It is also provided with up to three NTC
or PTC probe inputs, the first one for temperature control, the second and third one, to be located onto
the evaporator, to control the defrost termination temperature on the evaporator 1 and 2.
It allows to program the controller by means the HOT KEY programming keyboard.
3. CONTROLLING LOADS
3.1 COMPRESSOR
The regulation is performed according to
the temperature measured by the
thermostat probe with a positive
differential from the set point: if the
temperature increases and reaches set
point plus differential the compressor is
started and then turned off when the
temperature reaches the set point value
again.
Time
Temper.
Compr.
SET
ON
In case of fault in the thermostat probe the start and stop of the compressor are timed through
parameters Con and CoF.
3.2 SECOND COMPRESSOR MANAGEMENT
The relay of the second compressor is activated according to the settings of the following parameters.
The 2CC (SEq; HAF), defines how the second compressor is activated.
3.2.1 Sequence activation
With 2CC = SEq the second compressor is activated after a delay counter AC1 ( parameter ). Both
compressor are switched off when the temperature set point is reached.
3.2.2 Dual band activation
With 2CC = HAF the regulation is
changed as follows.
a. Activation of
compressors
The activation threshold of the first
compressor is (where T is
temperature):
T> SET + Hy
The activation threshold of the
second compressor is (where T is
temperature) :
T>SET+Hy+Hy2
The second compressor is activated in any case only if the AC1 timer has already expired, where AC1
is the delay between the activation of two compressors
b. Deactivation of compressors
The second compressor is switched off when the temperature drops below
T <SET + Hy
The first compressor is turned off when:
T<SET
ROTATION
Once both the compressors are switched off, the activation order of the 2 compressors is reversed in
order to balance the working hours.
A cycle is considered as completed even if only one compressor is switched on and off: that is, when
the temperature exceeds the first activation threshold, (SET + HY) and then latter returns below the
value of the set point (SET).
STALL PREVENTION
The Mon parameter defines the maximum time a single compressor can run continuously. When the
Mon timer expires the other compressor is activated, to increase capacity and therefore to reduce the
temperature, both the compressors are switched off at the same time when the SET point is reached
3.3 DEFROST
3.3.1 THE PRE-DEFROST CYCLE
A pre-defrost cycle, to cool deeper the goods before the defrost can be managed.
If it is enabled the temperature set point (SET) becomes: SET+Hd1 for Ht1 mins, then the defrost
starts.
The pre-defrost cycle cannot be performed if the defrost is started manually by keyboard.
3.3.2 THE POST- DEFROST CYCLE
After defrost and dripping time, a post defrost cycle can be managed.
If it is enabled the temperature set point (SET) becomes: SET+Hd2 for Ht2 mins, then the standard
regulation starts..
If enabled, the post defrost cycle si always done.
3.3.3 DEFROST MODES
Two defrost modes are available through the tdF parameter: defrost through electrical heater
(tdF=EL) and hot gas defrost (tdF=in). In this case by the parameter StC (0÷15min) the compressor
can be stopped before the defrost. The compressor is stopped after the pre-defrost cycle.
Other parameters are used to control the interval between defrost cycles (idF), its maximum length
(MdF) and two defrost 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.
3.3.4 SECOND EVAPORATOR CONTROL AND EVAPORATORS CYCLING
WITH HOT GAS DEFROST
With tdF = ALt a hot gas defrost with double evaporator is managed. The 2 evaporators are
alternated according to the following indications:
a. After IdF the COMP+DEF1 are activated
b. After IdF the COMP+DEF2 are activated
c. After IdF the COMP+DEF1 are activated
3.4 CONTROL OF EVAPORATOR FANS
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.
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.
3.4.1 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.
3.4.2 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.

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3.4.3 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.
Functioning: if the difference of temperature between the evaporator and the room probes is more
than the value of the Fct parameter, the fans are switched on. With Fct=0 the function is disabled.
3.4.4 Double humidity function
By means of the parameter FSU is possible to set different actions of the fan.
With FSU = Std the fan operates according to Fnc parameter
With FSU = Fon, FNC = C-n or C-Y and i1F = FAn or by UP key pushed for 3s is
possible to perform a double humidity action: when the digital input is activated, it
keeps evaporator fan continuously working, when d.i. is disable the fan works with
compressor.
NOTE2: With this function enabled the LED flashes.
With FSU = FoF and i1F = FAn or by UP key pushed for 3s when the digital input is
activated, it stops the fan, when d.i. is disable the fan works according to the FnC
parameter.
NOTE2: With this function enabled the LED flashes.
3.5 DRIPPING HEATERS
With oAx=HEt, the relay will work as dripping heater to eliminate the humidity/water after a defrost.
The relay is on during Stc time and for hot gas defrost during defrost and dripping time.
4. FRONT PANEL COMMANDS
To display target set point; in programming mode it selects a parameter or confirm
an operation.
Dual temperature function
Pushed for 5s within the first min after power on, it switches from negative
temperature (Lt) to positive temperature (Pt)
(UP/Dual Humidity)In programming mode it browses the parameter codes or
increases the displayed value.
Hold pushed for 5s enable/disabled the fan according to the setting.
(DOWN) In programming mode it browses the parameter codes or decreases the
displayed value.
Hold pushed for 5s to start a manual defrost
Hold pushed for 5s to switch the instrument on and off (when onF=oFF).
To switch on and off the light output (if present).
KEY COMBINATIONS:
+
To lock & unlock the keyboard.
+
To enter in programming mode.
+
To return to the room temperature display.
4.1 USE OF LEDS
Each LED function is described in the following table.
LED
MODE
FUNCTION
ON
Compressor enabled
Flashing
Anti-short cycle delay enabled
ON
Defrost enabled
Flashing
Drip time in progress
ON
An alarm is occurring
ON
Continuous cycle is running
°C/°F
ON
Measurement unit
Flashing
Programming phase
ON
Fans enabled
Flashing
Fans delay after defrost in progress.
ECO
ON
Energy saving enabled
AUX
ON
AUX relay on
LED
MODE
FUNCTION
Flashing
Fan stopped by key
5. MAX & MIN TEMPERATURE MEMORIZATION
5.1 HOW TO: SEE THE MIN TEMPERATURE
1. Press and release the DOWN key.
2. The “Lo” message will be displayed followed by the minimum temperature recorded.
3. By pressing the DOWN key again or by waiting 5 sec the normal display will be restored.
5.2 HOW TO: SEE THE MAX TEMPERATURE
1. Press and release the UP key.
2. The “Hi” message will be displayed followed by the maximum temperature recorded.
3. By pressing the UP key again or by waiting 5 sec the normal display will be restored.
5.3 HOW TO: RESET THE MAX AND MIN TEMPERATURE RECORDED
1. Keep the SET key pressed more than 3 sec, while the max or min temperature is displayed.
(“rSt”message will be displayed)
2. To confirm the operation the “rSt” message will start blinking and the normal temperature will be
displayed.
6. DUAL TEMPERATURE FUNCTION
6.1.1 How to see which temperature function is used
Push and release the key, controller will display:
-Pt: positive temperature
-Lt: negative temperature
6.1.2 How to switch from LT to PT and vice versa
To modifiy the operating temperature, keep pushed for 5s the key within the first minute after
start up: controller will move from negative temperature (LT) to positive temperature (Pt) and vice
versa.
NB: after switching the temperature the controller is switched off and on to load the new configuration.
7. MAIN FUNCTIONS
7.1 HOW TO: SEE THE SET POINT
1. Push and immediately release the SET key: the display will show the Set
point value.
2. Push and immediately release the SET key or wait for 5 sec to display
the probe value again.
7.2 HOW TO CHANGE THE SET POINT
1. Push the SET key more than 2 sec to change the Set point value.
2. The value of the set point will be displayed and the “°C” or “°F”LED will start blinking.
3. To change the Set value push the UP or DOWN arrows within 10 sec.
4. To save the new set point value, push the SET key again or wait for 10 sec.
7.3 HOW TO START A MANUAL DEFROST
Push the key for more than 2 sec and a manual defrost will start.
7.4 HOW TO: CHANGE A PARAMETER VALUE
To change a parameter value, operate as follows:
1. Enter the Programming mode by pressing the SET+DOWN buttons for 3s (the °C or °F LED will
start blinking).
2. Select the required parameter. Press the SET button to display its actual value.
3. Use UP or DOWN buttons to change its value.
4. Press SET button to store the new value and move to the following parameter.
To exit: Press SET + UP buttons or waiting for 15s without pressing any key.
NOTE: the set value is stored even when the procedure is exited by waiting for the time-out to expire.
7.5 THE HIDDEN MENU
The hidden menu includes all the parameters of the instrument.
7.5.1 HOW TO: ENTER THE HIDDEN MENU
1. Enter the Programming mode by pressing the SET+DOWN buttons for 3 sec (the °C or °F LED will
start blinking).
2. Released the buttons and then push again the SET+DOWN buttons for more than 7s. The Pr2
label will be displayed immediately followed from the HY parameter.
Now it is possible to browse the hidden menu.
3. Select the required parameter.
4. Press the SET button to display its value.
5. Use UP or DOWN to change its value.
6. Press SET to store the new value and move to the following parameter.
To exit: Press SET+DOWN or wait 15 sec without pressing a key.
NOTE1: if no parameter is present in Pr1 menu, after 3 sec the “noP” message will be displayed.
Keep the buttons pushed till the Pr2 message will be displayed.
NOTE2: the set value is stored even when the procedure is exited by waiting for the time-out to expire

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7.5.2 HOW TO: MOVE A PARAMETER FROM THE HIDDEN MENU TO THE
FIRST LEVEL AND VICEVERSA.
Each parameter present in the hidden menu (Pr2) can be moved into the user level (Pr1) by pressing
SET+DOWN buttons. If a parameter is part of the user level, when showed in the hidden menu the
decimal point will be lit.
7.6 HOW TO: LOCK THE KEYBOARD
1. Keep both UP and DOWN buttons pressed for more than 3 sec.
2. The “PoF” message will be displayed and the keyboard will be locked. At this point it will be
possible only to see the set point or the MAX o Min temperature stored
3. If a button is pressed more than 3 sec the “PoF” message will be displayed
7.7 HOW TO: UNLOCK THE KEYBOARD
Keep pressed together for more than 3 sec the UP and DOWN keys till the “Pon” message will be
displayed.
7.8 THE CONTINUOUS CYCLE
When defrost is not in progress, it can be activated by holding the UP key pressed for about 3 sec.
The compressor operates to maintain the CCSset point for the time set through the CCt parameter.
The cycle can be terminated before the end of the set time using the same activation key UP for 3 sec.
7.9 THE ON/OFF FUNCTION
With “onF = oFF”, pushing the ON/OFF key, the instrument is switched off. The “OFF”
message is displayed. In this configuration, the regulation is disabled.
To switch the instrument on, push again the ON/OFF key.
WARNING: Loads connected to the normally closed contacts of the relays are always supplied
and under voltage, even if the instrument is in stand by mode.
7.10 SECOND DIGITAL INPUT OR PROBE 4.
The input normally used as fourth probe can be used as second digital input according to the setting of
the parameter P4C.
With P4C = Pb the input works as probe.
With P4C = i2F the input works as second digital input (par. i2F)
8. PARAMETERS
REGULATION
HY
Differential: (0.1 to 25.5°C; 1 to 45°F) intervention differential for set point. Compressor
Cut IN is Set Point + differential (HY). Compressor Cut OUT is when the temperature
reaches the set point.
LS
Minimum set point: (-100°C to SET; -148°F to SET) sets the minimum value for the
set point.
US
Maximum set point: (SET to 150°C; SET to 302°F) set the maximum value for set
point.
ot
Thermostat probe calibration: (-12.0 to 12.0°C; -21 to 21°F) allows to adjust possible
offset of the thermostat probe.
P2P
First evaporator probe presence: (n; Y) n= not present, the defrost stops by time;
Y= present, the defrost stops by temperature.
oE
First evaporator probe calibration: (-12.0 to 12.0°C; -21 to 21°F) allows to adjust
possible offset of the evaporator probe.
P3P
Second evaporator probe presence (P3): (n; Y) n= not present, the terminals operate
as digital input; Y= present, the terminals operate as third probe.
o3
Second evaporator probe calibration (P3): (-12.0 to 12.0°C; -21 to 21°F) allows to
adjust possible offset of the third probe.
P4P
Fourth probe presence (P4): (n; Y) n= not present, Y= present
O4
Fourth probe calibration (P4): (-12.0 to 12.0°C; -21 to 21°F) allows to adjust possible
offset of the fourth probe.
P4C
Probe 4 setting (Pb = temperature probe: id4 = second digital input)
odS
Outputs activation delay at start up: (0 to 255min) this function is enabled at the initial
start up of the instrument and inhibits any output activation for the period of time set in
the parameter.
AC
Anti-short cycle delay for first compressor: (0 to 50 min) minimum interval between
the compressor stop and the following restart.
AC1
Anti-short cycle delay for second compressor: (0 to 50 min) minimum interval
between the compressor stop and the following restart.
Mon
Maximum time single compressor on : (0÷255min; with 0 function not enabled).
When Mon is expired the second compressor is activated.
2CC
Dual compressor management: SEq = sequence –HAF= Dual band
rtr
Percentage of the third and first probe for regulation (0÷100; 100 = P1, 0 = P3 ): it
allows to set the regulation according to the percentage of the first and third probe, as
for the following formula (rtr(P1-P3)/100 + P3)
CCt
Compressor ON time during continuous cycle: (0.0 to 24h00min, res. 10 min) 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.
CCS
Set point for continuous cycle: (-55 to 150°C; -67 to 302°F) it sets the set point used
during the continuous cycle.
Con
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.
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.
DISPLAY
CF
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).
rES
Resolution (for °C): (in=1°C; dE=0.1°C) allows decimal point display.
Lod
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.
rEd
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.
dLy
Display delay: (0 ÷20.0m; risul. 10s) when the temperature increases, the display is
updated of 1 °C/1°F after this time.
dtr
Percentage of the third and first probe for visualization when Lod = dtr (0÷100; 100
= P1, 0 = P3 ): if Lod = dtr it allows to set the visualization according to the percentage
of the first and third probe, as for the following formula (dtr(P1-P3)/100 + P3).
DEFROST
tdF
Defrost type: (EL; in) EL = electrical heater; in = hot gas.
dFP
Probe selection for first defrost termination: (nP; P1; P2; P3; P4) nP = no probe;
P1 =thermostat probe; P2 = second probe; P3 =configurable probe; P4 = Fourth probe.
dSP
Probe selection for second defrost termination: (nP; P1; P2; P3; P4) nP = no probe;
P1 =thermostat probe; P2 = second probe; P3 =configurable probe; P4 = Fourth probe.
dtE
First defrost termination temperature: (-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.
dtS
Second defrost termination temperature: (-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 120 hours) determines the interval of time
between two defrost cycles.
MdF
(Maximum) length for first defrost: (0 to 255 min) 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.
MdS
(Maximum) length for second defrost: (0 to 255 min) 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 99 min) this is useful when different defrost start times are
necessary to avoid overloading the plant.
StC
Compressor stop before defrost: (da 0 a 30 min) with hot gas defrost it sets
compressor stop vefore defrost.
dFd
Temperature 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 255 min) sets the maximum time between the
end of defrost and the restarting of the real room temperature display.
Fdt
Drip time: (0 to 120 min) 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.
Hd1
Pre-defrost cycle differential (-12.0÷12.0°C/-24÷24°F)
Ht1
Pre-defrost cycle duration (0÷120min)
Hd2
Post-defrost cycle differential (-12.0÷12.0°C/-24÷24°F)
Ht2
Post-defrost cycle duration (0÷120min)
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.
FANS
FnC
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.
Fnd
Fans delay after defrost: (0 to 255min) interval between end of defrost and evaporator
fans start.
FCt
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.
FSt
Fans stop temperature: (-55 to 50°C; -67 to 122°F) setting of temperature, detected by
evaporator probe, above which fans are always OFF.
Fon
Fan ON time: (0÷15 min) 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.
FoF
Fan OFF time: (0÷15 min) with Fnc = C_n or C_y, (fan activated in parallel with
compressor). it sets the evaporator 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.
FSU
Kind of action of fan:
Std = standard, according to the Fnc parameter
Fon = with i1F = FAn and Fnc = Cn or C-y, by means of digital input the fan works
according to the Fnc parameter or are always on.
FoF = with i1F = FAn by means of digital input the fan are enabled or switched off.
ALARMS
ALU
MAXIMUM temperature alarm:
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
Minimum temperature alarm:
If ALC=Ab: [-100°C to ALU; -148 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 temperature alarm recovery: (0.1 to 25.5°C; 1 to 45°F) intervention
differential for recovery of temperature alarm.
ALd
Temperature alarm delay: (0 to 255 min) time interval between the detection of an
alarm condition and alarm signalling.

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dAo
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.
OUTPUT RELAYS
oA1
First relay configuration AUX1: (dEF; FAn; ALr; LiG; AUS; onF; db; CP2; dEF2) dEF =
defrost; FAn = do not select it; ALr = alarm; LiG = light; AUS = Auxiliary relay; onF =
always on when instrument on; CP2 = second compressor; dEF2 = second defrost.
oA2
Second relay configuration AUX2: (dEF; FAn; ALr; LiG; AUS; onF; db; CP2; dEF2)
dEF = defrost; FAn = do not select it; ALr = alarm; LiG = light; AUS = Auxiliary relay;
onF = always on when instrument on; CP2 = second compressor; dEF2 = second
defrost.
oA3
Third relay configuration AUX3: (dEF; FAn; ALr; LiG; AUS; onF; db; CP2; dEF2) dEF
= defrost; FAn = do not select it; ALr = alarm; LiG = light; AUS = Auxiliary relay; onF =
always on when instrument on; CP2 = second compressor; dEF2 = second defrost.
DIGITAL INPUTS
i1P
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.
i1F
Second digital input configuration: (EAL; bAL; PAL; dor; dEF; AUS; Htr; FAn; ES)
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; AUS = auxiliary relay activation with
oAx=AUS; Htr = type of inverting action (cooling or heating); FAn = fan; ES = energy
saving.
did
Digital input 1 alarm 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.
nPS
Number 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
Compressor 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 alarm: (n; Y) n= outputs follow the odC parameter.
Y= outputs restart with a door open alarm.
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.
OTHER
HES
Temperature increase during the Energy Saving cycle : (-30,0°C30,0°C/-22÷86°F)
it sets the increasing value of the set point during the Energy Saving cycle
o-F
Display during stand by: OFF = “OFF”; Lin: “- - -“
Adr
Serial address: (1 to 247) identifies the instrument address when connected to a
ModBUS 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- optional.
dP4
Fourth probe display- optional.
rEL
Software release for internal use.
Ptb
Parameter table code: readable only.
9. DIGITAL INPUTS
The free voltage digital input is programmable by the i1F parameter.
9.1 GENERIC ALARM (I1F = EAL)
As soon as the digital input is activated the unit will wait for did time delay before signalling the EAL
alarm message. The outputs statuses don’t change. The alarm stops just after the digital input is de-
activated.
9.2 SERIOUS ALARM MODE (I1F = BAL)
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.
9.3 PRESSURE SWITCH (I1F = 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 in the did time is reached, switch off and on the instrument to restart normal
regulation.
9.4 DOOR SWITCH INPUT (I1F = DOR)
It signals the door status and the corresponding relay output status through the odCparameter:
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=YES. 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.
9.5 START DEFROST (I1F = DEF)
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.
9.6 SWITCH THE AUXILIARY RELAY (I1F = AUS)
With oA3 = AUS the digital input switched the status of the auxiliary relay
9.7 ENERGY SAVING (I1F = 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.
9.8 ON OFF FUNCTION (I1F = ONF)
To switch the controller on and off.
9.9 DIGITAL INPUT POLARITY
The digital input polarity depends on the i1P parameter.
i1P = CL: the input is activated by closing the contact.
i1P = oP: the input is activated by opening the contact
10. TTL SERIAL LINE –FOR MONITORING SYSTEMS
The TTL serial line, available through the HOT KEY connector, allows to connect the instrument to a
monitoring system ModBUS-RTU compatible such as the XWEB500. The connection needs a special
TTL/RS485 adapter: the XJ485CX.
11. INSTALLATION AND MOUNTING
Instrument XR44CX 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.
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.
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.
13. USE THE HOT KEY
13.1 HOW TO: PROGRAM A HOT KEY FROM THE INSTRUMENT (UPLOAD)
1. Program one controller with the front keypad.
2. When the controller is ON, insert the “HOT-KEY”and push UP button; the “uPL”message
appears followed a by a flashing “End”label.
3. Push SET button and the “End”will stop flashing.
4. Turn OFF the instrument, remove the “HOT-KEY”and then turn it ON again.
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.
13.2 HOW TO: PROGRAM AN INSTRUMENT USING A HOT KEY (DOWNLOAD)
1. Turn OFF the instrument.
2. 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.
4. After 10 seconds the instrument will restart working with the new parameters.
5. Remove the “HOT-KEY”.
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
Message
Cause
Outputs
P1
Room probe failure
Compressor output acc. to par. Con and CoF
P2
Evaporator probe failure
Defrost end is timed
P3
Third probe failure
Outputs unchanged
P4
Fourth probe failure
Outputs unchanged
HA
Maximum temperature alarm
Outputs unchanged.
LA
Minimum temperature alarm
Outputs unchanged.
dA
Door open
Compressor and fans restarts
EA
External alarm
Output unchanged.
CA
Serious external alarm (i2F=bAL)
All outputs OFF.
CA
Pressure switch alarm (i2F=PAL)
All outputs OFF
oFF
Controller in stand by
All outputs OFF
-- -
Controller in stand by
All outputs OFF
14.1 ALARM RECOVERY
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.

xxxxxxxxxxxxxxxxxx XR44CH ISA GB r1.6 21.11.2016 XR44CH 5/5
Temperature alarms “HA”and “LA” automatically stop as soon as the temperature returns to normal
values.
Alarms “EA” and “CA” (with i1F=bAL)recover as soon as the digital input is disabled.
Alarm “CA” (with i1F=PAL) recovers only by switching off and on the instrument.
14.2 OTHER MESSAGES
Pon
Keyboard unlocked.
PoF
Keyboard locked
noP
In programming mode: none parameter is present in Pr1
On the display or in dP2, dP3, dP4: the selected probe is nor enabled
15. TECHNICAL DATA
Housing: self extinguishing ABS.
Case: frontal 32x74 mm; depth 60mm;
Mounting: panel mounting in a 71x29mm panel cut-out
Protection: IP20; Frontal protection: IP65
Connections: Screw terminal block 2.5 mm2wiring
Power supply: 12VAC/DC, ±10%
Power absorption: 3VA max
Display: 3 digits, red LED, 14.2 mm high
Inputs: Up to 3 NTC or PTC probes
Digital inputs: free voltage contact
Relay outputs:
Compressor SPST 16(6) A 250VAC
AUX1: SPST 16(6) A, 250VAC
AUX2: SPST 16(6) A, 250VAC
Aux3: SPST 16(6) A, 250VAC
Buzzer: optional
Data storing: on the non-volatile memory (EEPROM)
Kind of action: 1B
Pollution degree: 2
Software class: A
Rated impulsive voltage: 2500V
Overvoltage Category: II
Operating temperature: 0 to 55°C
Storage temperature: -25 to 60°C
Relative humidity: 20 to 85% (no condensing)
Measuring and regulation range:
NTC probe: -40 to 110°C (-40 to 230°F)
PTC probe: -100 to 150°C (-148 to 302°F)
Resolution: 0.1°C or 1°C or 1°F (selectable)
Accuracy (ambient temp. 25°C): ±0.7°C ±1 digit
16. CONNECTIONS
17. DEFAULT SETTING VALUES
Label
Name
Range
Nt
Liv
SEt
Set point
LS-US
-5.0
HY
Differential
[0,1°C ÷ 25,5°C] [1°F ÷ 45°F]
2.0
Pr2
LS
Minimum set point
[-55,0°C ÷ SET] [-67°F ÷ SET]
-40.0
Pr2
US
Maximum set point
[SET ÷ 150,0°C] [SET ÷ 302°F]
110.0
Pr2
ot
Thermostat probe calibration
[-12,0°C ÷ 12,0°C] [-21°F ÷ 21°F]
0.0
Pr2
P2P
Evaporator probe presence
n(0) –Y(1)
yes
Pr2
oE
Evaporator probe calibration
[-12,0°C ÷ 12,0°C] [-21°F ÷ 21°F]
0.0
Pr2
P3P
Third probe presence
n(0) –Y(1)
no
Pr2
o3
Third probe calibration
[-12,0°C ÷ 12,0°C] [-21°F ÷ 21°F]
0.0
Pr2
P4P
Fourth probe presence
n(0) –Y(1)
no
Pr2
o4
Fourth probe calibration
[-12,0°C ÷ 12,0°C] [-21°F ÷ 21°F]
0.0
Pr2
P4C
Fourth probe function
Pb –id4
Pb
Pr2
odS
Outputs delay at start up
0 ÷ 255 (min.)
0
Pr2
AC
Anti-short cycle delay for first
compressor
0 ÷ 50 (min.)
1
Pr2
AC1
Anti-short cycle delay for second
compresor
0 ÷ 255 (sec.)
10
Pr2
Mon
Max time compressor 1 on
0 ÷ 255 (min.)
0
Pr2
2CC
Dual compressor management
SEq(0) –HAF (1)
HAF
Pr2
rtr
P1-P3 percentage for regulation
0 ÷ 100 (100=P1 , 0=P3)
100
Pr2
CCt
Continuous cycle duration
0 ÷ 24H0(144)
00:00
Pr2
CCS
Set point for continuous cycle
[-55.0°C ÷ 150,0°C] [-67°F ÷ 302°F]
0.0
Pr2
Con
Compressor ON time with faulty
probe
0 ÷ 255 (min.)
15
Pr2
CoF
Compressor OFF time with faulty
probe
0 ÷ 255 (min.)
15
Pr2
CH
Kind of action
CL(0) - Ht(1)
CL
Pr2
CF
Temperature measurement unit
°C(0) - °F(1)
°C
Pr2
rES
Resolution
dE(0) - in(1)
dE
Pr2
Lod
Probe displayed
P1(0) - P2(1) - P3(2) - P4(3) - SEt(4) - dtr(5)
P1
Pr2
rED
Local display: default display
P1(0) - P2(1) - P3(2) - P4(3) - SEt(4) - dtr(5)
P1
Pr2
Label
Name
Range
Nt
Liv
dLy
Display temperature delay
0 ÷ 255 (sec)
0
Pr2
dtr
P1-P3 percentage for display
1 ÷ 99
50
Pr2
tdF
Defrost type
EL(0) - in(1) - ALt(2)
in
Pr2
dFP
Probe for first defrost
nP(0) - P1(1) - P2(2) - P3(3) - P4(4)
P2
Pr2
dSP
Probe for second defrost
nP(0) - P1(1) - P2(2) - P3(3) - P4(4)
nP
Pr2
dtE
First defrost termination
temperature
[-55.0°C ÷ 50.0°C] [-67°F ÷ 122°F]
8.0
Pr2
dtS
Second defrost termination
temperature
[-55.0°C ÷ 50.0°C] [-67°F ÷ 122°F]
8.0
Pr2
idF
Interval between defrost cycles
0 ÷ 120 (hours)
6
Pr2
MdF
(Maximum) length for first defrost
0 ÷ 255 (min.)
30
Pr2
MdS
(Maximum) length for second
defrost
0 ÷ 255 (min.)
0
Pr2
dSd
Start defrost delay
0 ÷ 255 (min.)
0
Pr2
dFd
Displaying during defrost
rt(0) - it(1) - SEt(2) - dEF(3)
it
Pr2
dAd
Display delay after defrost
0 ÷ 255 (min.)
30
Pr2
Fdt
Draining time
0 ÷ 255 (min.)
2
Pr2
dPo
First defrost after start-up
n(0) - Y(1)
no
Pr2
dFd
Displaying during defrost
rt(0) - it(1) - SEt(2) - dEF(3)
it
Pr2
Hd1
Differenziale rispetto al set per
ciclo pre-sbrinamento
-12.0÷12.0°C/-24÷24°F
-5.0
Pr2
Ht1
Durata ciclo pre-sbrinamento
0÷120min
5
Pr2
Hd2
Differenziale rispetto al set per
ciclo post-sbrinamento
-12.0÷12.0°C/-24÷24°F
-5.0
Pr2
Ht2
Durata ciclo post-sbrinamento
0÷120min
5
Pr2
dAF
Defrost delay after fast freezing
0 ÷ 24H0(144)
00:00
Pr2
FnC
Fan operating mode
C_n(0) - O_n(1) - C_Y(2) - O_Y(3)
O_n
Pr2
Fnd
Fan delay after defrost
0 ÷ 255 (min.)
2
Pr2
FCt
Differential of temperature for
forced activation of fans
[0°C ÷ 50°C] [0°F ÷ 90°F]
0
Pr2
FSt
Fan stop temperature
[-55.0°C ÷ 50.0°C] [-67°F ÷ 122°F]
4.0
Pr2
Fon
Time is ON when compressors
oFF
0÷15 (min.)
0
Pr2
FoF
Time is OFF when compressors
oFF
0÷15 (min.)
0
Pr2
FSU
Fan operating type
Std(0) - FoF(1) - Fon(2)
Std
Pr2
ALC
Temperat. alarms configuration
rE(0) - Ab(1)
Ab
Pr2
ALU
MAXIMUM temperature alarm
°C[0.0° ÷ 50.0° o ALL ÷ 150,0°] °F[0° ÷ 90° o
ALL ÷ 302°]
110.0
Pr2
ALL
Minimum temperature alarm
°C[0.0° ÷ 50.0° o -55.0° ÷ ALU] °F[0° ÷ 90° o -
67.0° ÷ ALU]
-50.0
Pr2
AFH
Differential for temperat. alarm
recovery
[0,1°C ÷ 25,5°C] [1°F ÷ 45°F]
1.0
Pr2
ALd
Temperature alarm delay
0 ÷ 255 (min.)
10
Pr2
dAo
Delay of temperature alarm at start
up
0 ÷ 24H0(144)
01:30
Pr2
oA1
AUX1 relay configuration
dEF(0) - FAn(1) - ALr(2) - LiG(3) - AUS(4) -
OnF(5) - db(6) - CP2(7) - dF2(8) - HES(9)
CP2
Pr2
oA2
AUX2 configuration
dEF(0) - FAn(1) - ALr(2) - LiG(3) - AUS(4) -
OnF(5) - db(6) - CP2(7) - dF2(8) - HES(9)
FAn
Pr2
oA3
AUX3 relay configuration
dEF(0) - FAn(1) - ALr(2) - LiG(3) - AUS(4) -
OnF(5) - db(6) - CP2(7) - dF2(8) - HES(9)
dF2
Pr2
i1P
Digital input polarity
OP(0) - CL(1)
OP
Pr2
i1F
Digital input configuration
EAL(0) - bAL(1) - PAL(2) - dor(3) - dEF(4) -
AUS(5) - Htr(6) - FAn(7) - ES(8) - nt(9) - onF(10)
BAL
Pr2
did
Digital input alarm delay
0 ÷ 255 (min.)
0
Pr2
i2P
Second digital input polarity
OP(0) - CL(1)
CL
Pr2
i2F
Second digital input function
EAL(0) - bAL(1) - PAL(2) - dor(3) - dEF(4) -
AUS(5) - Htr(6) - FAn(7) - ES(8) - nt(9) - onF(10)
EAL
Pr2
d2d
Alarm delay of configurable digital
input
0 ÷ 255 (min.)
0
Pr2
nPS
Number of activations of pressure
switch
0 ÷ 15
15
Pr2
odC
Compress and fan status when
open door
no(0) - FAn(1) - CPr(2) - F-C(3)
no
Pr2
rrd
Regulation restart with door open
alarm
n(0) - Y(1)
yes
Pr2
HES
Differential for Energy Saving
[-30°C ÷ 30°C] [-54°F ÷ 54°F]
0
Pr2
o-F
Visualization on stand-by
n(0) - Y(1)
OFF
Pr2
Adr
Serial address
0 ÷ 247
1
Pr2
PbC
Kind of probe
PtC(0) - ntC(1)
ntC
Pr2
dP1
Room probe display
probe value
-
Pr1
dP2
Evaporator probe display
probe value
-
Pr1
dP3
Third probe display
probe value
-
Pr1
dP4
Fourth probe display
probe value
-
Pr1
rSE
Visualization of regulation set
(SET + ES + SETd)
Read only
-
Pr2
rEL
Software release
read only
1.6
Pr2
Ptb
Map code
read only
-
Pr2