Emerson DIXELL XR77CHC User manual

1592034020 XR77CHC EN r1.0 2019.01.31 XR77CHC 1/7
DIGITAL CONTROLLER WITH
BLUETOOTH CONNECTIVITY
XR77CHC
82 rel. 1.0.1
1GENERAL WARNINGS................................................................................................................................... 1
2GENERAL DESCRIPTION .............................................................................................................................. 1
3REGULATION.................................................................................................................................................. 1
4SECOND COMPRESSOR .............................................................................................................................. 1
5ENERGY SAVING ALGORITHM .................................................................................................................... 1
6PULL DOWN FUNCTION................................................................................................................................ 1
7EVAPORATOR FANS ..................................................................................................................................... 1
8CONDENSER FAN.......................................................................................................................................... 2
9DEFROST ........................................................................................................................................................ 2
10 DIGITAL OUTPUT CONFIGURATION ........................................................................................................... 2
11 FRONT PANEL COMMANDS ......................................................................................................................... 2
12 PARAMETER MENU ....................................................................................................................................... 3
13 PARAMETERS ................................................................................................................................................ 3
14 DIGITAL INPUTS............................................................................................................................................. 5
15 INSTALLATION AND MOUNTING.................................................................................................................. 5
16 OPTIONAL FEATURES .................................................................................................................................. 5
17 ELECTRICAL CONNECTIONS....................................................................................................................... 5
18 USE THE HOT-KEY ........................................................................................................................................ 6
19 INTERNAL MEMORY ...................................................................................................................................... 6
20 ALARM SIGNALLING ...................................................................................................................................... 6
21 TECHNICAL DATA .......................................................................................................................................... 6
22 WIRINGS.......................................................................................................................................................... 6
23 BLUETOOTH COMMUNICATION .................................................................................................................. 7
1GENERAL WARNINGS
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.
2GENERAL DESCRIPTION
The XR77CHC, 32x74x60mm format, is a microprocessor-based controller suitable for applications
on medium or low temperature ventilated refrigeration units. It has 4 relay outputs to control
compressor, fans, light and defrost or auxiliary output. The device is also provided with up to 4 NTC,
PTC or PT1000 probe inputs: the first one for temperature control, the second one to be located onto
the evaporator to control the defrost termination temperature and to manage the fan and the third,
optional and located on the HOT-KEY port, used to control the condenser temperature. The controller
has a couple of configurable digital inputs. By using the HOT-KEY it is possible to program the
instrument in a quick and easy way.
The controller has Bluetooth 4.2 connectivity.
3REGULATION
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 will
start. The compressor will stop when the
temperature reaches the set point value
again.
In case of fault because of the thermostat probe, the start and stop of the compressor are timed
through parameters CoF and Con.
4SECOND COMPRESSOR
The controller can drive double compressor circuits. To do this, a couple of relays need to be properly
configured: oAx=CP1 and oAy=CP2. The parameters used for this kind of regulation are the following:
AC
Compressor anti-short-cycle delay
AC1
Second compressor anti-short-cycle delay
2CC
Activation mode for second compressor (valid if oAx=CP1 and oAy=CP2)
rCC
Compressors rotation enabled
Cdd
Maximum time with compressor active
The second compressor output is activated by following the 2CC parameter:
-If 2CC=FUL, the second compressor is activated in parallel with the first compressor (CP1),
with a possible delay as set in the AC1 parameter. Both compressors are switched off at the
same time (when T<SET).
-If 2CC=HAF, the second compressor is activated when the temperature T>SET+HY+HY1. The
delay AC1 is always respected. The second compressor is deactivated when T<SET+HY.
With parameter rCC it is possible to enable the compressor rotation function: the activation of the first and the
second compressor will be alternated to equalize the number of working hours of both. In case of hot gas
defrost operation, it is possible to select if one or both compressors will be used.
5ENERGY SAVING ALGORITHM
5.1 DESCRIPTION
The device permits to set different temperature to be used during normal and reduced power use. The
standard SET-POINT (SET) is used to maintain the temperature at a certain value when the energy
saving status (ES) is not active. On the other side, when the ES status is active a different SET-POINT
(SET_ES), higher than the standard one, will be used. The parameter HES will have to be set to
change the regulation temperature according to the following formula:
SET_ES = SET + HES
There are also two different differential values for SET and SET_ES, which are used for compressor
cut-in and cut-out: when ES status is active the HYE parameter will be used instead of the HY
parameter.
5.2 BASIC ENERGY SAVING ALGORITHM
The energy saving status will be always saved in the internal memory to resume previous operation if
a power failure occurs. It needs the presence of a door switch to work (for example: i1F=dor).
5.2.1 PARAMETER INVOLVED
•i1F or i2F: set as door input to monitor the appliance usage
•StE: interval to change from normal to energy saving mode
•EtS: interval to change from energy saving to normal mode
•HES: differential for SETPOINT when energy saving mode active
•HYE: differential for regulation when energy saving mode is active
•dS:interval for door opening detection
•LdE:light output controlled (OFF when energy saving mode is active)
FROM
TO
CHANGED BY
Normal
mode
Energy
Saving
- Pushing the DOWN button for 3 sec (if enabled).
- Door continuously closed for the StE time.
Energy
Saving
Normal
mode
- Pushing the DOWN button for 3 sec (if enabled).
- Controller in ES mode for the EtS time.
- If the controller is in ES mode, it returns in Standard mode
(normal set-point) after opening the door more than dS time.
NOTE: the cycling mode (ES - Normal mode - ES - etc.) works if i1F=dor and EtS and StEare
different from zero. If EtS=0 or StE=0, the controller will not change the operating mode, and it will be
possible to change from the normal mode to the energy saving mode by using ES button or by setting
i1F=ES. See the below diagrams where the status changing is described:
6PULL DOWN FUNCTION
The Pull Down is automatically activated:
•After any defrost
•After power-on if T>SET+CCS
•When the regulation probe temperature T is:
•T>SET+HY+oHt value in normal mode
•T>SET+HES+HYE+oHE value in energy saving mode
In this case, a different set-point value (SET+CCS) will be enabled. As soon as the room temperature reaches
the SET+CCS value, the compressor will be stopped and the normal regulation will restart. NOTE: Pull Down
function is disabled when CCS=0 or CCt=0.
The CCt parameter sets the maximum activation time for any pull down. When CCt expires, the Pull Down will
be immediately stopped and the standard SET-POINT will be restored.
7EVAPORATOR FANS
7.1 GENERAL DESCRIPTION
The evaporator fan is can be managed by dedicated control. To enable it, an evaporator probe must
be selected by using par. FAP. Here follows the description of all the related parameters:
•FAP: to select the evaporator fan probe
•FSt: to select the evaporator fan deactivation setpoint
•HYF: differential for evaporator fan activation
•FnC parameter it can be selected the evaporator fan working mode:
oFnC=C-n: evaporator fan will switch ON and OFF with the compressor and will
not run during defrost; when compressor is OFF, evaporator fan will start a duty-
cycle mode (see FoF, Fon, FF1 and Fo1 parameters).
oFnC=o-n: evaporator fan will run even if the compressor is off, and will not run
during defrost;
oFnC=C-Y: evaporator fan will switch ON and OFF with the compressor and will
run during defrost; when compressor is OFF, evaporator fan will enter a duty-
cycle working mode (see FoF, Fon, FF1 and Fo1 parameters).
oFnC=o-Y: evaporator fan will run continuously, also during defrost.
•Fnd: activation delay after any defrost
7.2 EVAPORATOR FAN AND DIGITAL INPUT
When the digital input is configured as door switch (i1F=dor), evaporator fan and compressor status will
depend on the par. odC:
•odC=no: normal regulation
•odC=FAn: evaporator fan OFF
•odC=CPr: compressor OFF
•odC=F-C: compressor and evaporator fan OFF
When rrd=Y the regulation will always restart after a door open alarm.

1592034020 XR77CHC EN r1.0 2019.01.31 XR77CHC 2/7
8CONDENSER FAN
8.1 GENERAL DESCRIPTION
The condenser fan is can be managed by dedicated control. To enable it, a condenser probe must be
selected by using par. FAC. Here follows the description of all the related parameters:
•FAC: to select the condenser fan probe
•St2: to select the condenser fan deactivation setpoint
•HY2: differential for condenser fan activation
•FCC parameter it can be selected the condenser fan working mode:
oFCC=C-n: condenser fan will switch ON and OFF with the compressor and will
not run during defrost
oFCC =o-n: condenser fan will run even if the compressor is off, and will not run
during defrost
oFCC =C-Y: condenser fan will switch ON and OFF with the compressor and will
run during defrost
oFCC =o-Y: condenser fan will run continuously, also during defrost.
9DEFROST
Two defrost modes are available through the tdF parameter: defrost through electrical heater
(tdF=EL) and hot gas defrost (tdF=in).
The defrost interval depends on the presence of the RTC (optional). The internal RTC is controlled by means
of the EdF parameter:
•EdF=in: the defrost is made every idF time –standard way for controller without RTC.
•EdF=rtC: the defrost is real time controlled, depending on the day enabled in the parameters
dd1…dd7 and the hours set in the parameters Ld1...Ld6.
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.
9.1 SYNCHRONIZED DEFROST
This defrost function requires:
-To set a digital input of any controller as ixF=dEF
-To connect (by wire) all digital inputs set as ixF=dEF
A maximum number of 20 controllers can be used in this configuration.
The Synchronized defrost mode is enabled by par. SYd=SYn. After any defrost request (received by RTC,
timed by par. idF, manually by defrost button or by digital input set as dEF), all controllers will activate their
own defrost phase. When a controller ends its proper defrost phase, it releases the defrost line and load its
dripping time. At the end of the dripping time the normal regulation will restart. The other controllers follow the
same logic.
9.2 RANDOM DEFROST
A random defrost mode can be enabled by par. Syd=rnd. After any defrost request (received by RTC or timed
by par. idF) a random delay will be added. At the end of the added delay the defrost will start. The random
function lead to desynchronize the start of the defrost phases in those cases where more than a cabinet is
installed in the same “island”. The maximum defrost delay is linked to the following parameters:
-Mdf=maximum time for any defrost
-ndE=delay multiplier
by the following formula:
MAX_DEFROST_DELAY = Mdf*ndE (min)
For example: if ndE=10 and Mdf=20 min, the total interval to complete the defrost phase will be 200 min
(worst case).
NOTE:
-take care about the interval of time available for defrost. It must be used for selecting both MdFand
ndE values
the higher is the ndE value and the better is the result in terms of desynchronization. On the other side, the
longer will be the total interval of time required to complete defrosts
10 DIGITAL OUTPUT CONFIGURATION
Depending on the model, one or more digital outputs (relays) can be configurated with one of the following
functionalities.
10.1 CONFIGURABLE OUTPUT
10.1.1 LIGHT OUTPUT
With oAx=LiG the relay operates as light output.
10.1.2 DIGITAL OUTPUT ACTIVATION
The auxiliary output can be managed by digital inputs (oAx=AUS, i1F or i2F=AUS): with oAx=AUS
and i1F, i2F=AUS the output is switched on and off following the linked digital input status.
10.1.3 AUXILIARY THERMOSTAT
The auxiliary regulator can be used to manage the auxiliary output. Here follow the involved
parameters:
•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
10.1.4 TIMED ACTIVATION
The following parameters can be used to define fixed activation and deactivation intervals.
•btA: base time for auxiliary output activation and deactivation intervals
•Ato: auxiliary activation interval
•AtF: auxiliary deactivation interval
10.1.5 GENERAL NOTES
if oAx=AUS and ArP=nP (no probe for auxiliary digital output) the AUX output can be managed:
•by digital input if i1F=AUS or i2F=AUS
•by auxiliary button (if set as AUS)
•by serial command (Modbus protocol)
•by fixed interval of time if Ato>0 and AtF>0 (if Ato=0 or AtF=0 the auxiliary output is disabled)
10.2 ON/OFF OUTPUT (OAX = ONF)
When oAx=onF, the output is activated when the controller is turned on and de-activated when the
controller is turned off.
10.3 DEAD BAND REGULATION
With oAx=db the output can be used to control, for example, a heater element. It is used to implement
a dead band regulation. If so:
•oAx=db cut in is SET-HY
•oA1=db cut out is SET
10.4 ALARM OUTPUT
With oAx=ALr the output operates as alarm output. It is activated every time an alarm happens. Its
status depends on the tbA parameter: if tbA=Y, the output is deactivated by pressing any key.
If tbA=n, the alarm output stays on until the alarm condition recovers.
10.5 ACTIVATION DURING ENERGY SAVING CYCLES
With oAx=HES, the output is activated when the energy saving cycle begins.
11 FRONT PANEL COMMANDS
Press to display target set point and the real set point. When in programming mode,
it selects a parameter or confirms an operation
(AUX/DEF) Programmable button, see par. LGC and LG2
(UP) In programming mode it browses the parameter codes or increases the
displayed value. Other functions related to par. UPC and UP2 (if available)
(DOWN) In programming mode it browses the parameter codes or decreases the
displayed value. Other functions related to the par. dnC and dn2 (if available)
(ONOFF) Keep it pressed for 3 sec to switch on and off the device
KEYS COMBINATION
+
To lock or unlock the keyboard
+
To enter in programming mode
+
To return to room temperature display
ICON
MODE
MEANING
On
Compressor enabled
Flashing
Anti-short cycle delay enabled (AC parameter)
On
Light output enabled
On
Ventilator output enabled
Flashing
Ventilator delay after defrost
,
On
Measurement unit
Flashing
Programming mode
On
Energy saving mode active
On
An alarm condition is present
Flashing
Start-up operations are pending
On
Auxiliary output is activated
On
Bluetooth connection enabled
11.1 SET POINT MENU
The SET key gives access to a quick menu where it is possible to see:
•the set point value
•the real set point value (rSE)
Push and release the SET key five times or wait for 60 sec to return to normal visualization.
11.2 CHANGE THE SETPOINT
1. Push the SET key for more than 3 sec to change the Set point value;
2. The value of the set point will be displayed and the “°C” LED starts blinking;
3. To change the Set value, push the UP or DOWN button.
4. To memorise the new set point value, push the SET button again or wait for 60 sec.

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11.3 START A MANUAL DEFROST
Push the DEFROST button for more than 3 sec to start a manual defrost.
12 PARAMETER MENU
The device has a parameter menu available from keyboard and where it is possible to modify some specific
parameters. A couple of parameter levels are present:
-PR1: user menu, standard parameters are placed into this menu
-PR2: protected menu, application specific parameters are placed here. A password can be
used to protect these values from unauthorized modification.
12.1 MENU NAVIGATION
A tree-structured menu is implemented to simplify the parameter browsing and modification. Follow the button
functions (valid both in PR1 and PR2):
-SET: used to enter a submenu or a stored value
-UP and DOWN: used to scroll the menu labels, the parameters into a submenu and to modify a
parameter value
-AUX/DEF: used to go back to the upper menu level (for example, from a submenu list of
parameters to the main menu labels)
12.2 CHANGE A PARAMETER VALUE
To change a parameter value, operate as follows:
1. Enter the Programming mode by pressing the SET+DOWN buttons for 3 sec (“°C”LED starts
blinking).
2. Select the required parameter. Press the SET button to display its value
3. Use UP or DOWN buttons to change its value.
4. Press SET to store the new value and move to the following parameter.
To exit: Press SET+UP buttons or waits for 15 sec without pressing any button.
NOTE: The modified value will be stored even if the programming mode ends by timeout.
12.3 PROTECTED LEVEL
The Protected Level has all the parameters of the instrument. This level is password protected. The
default password is: “000”. It is strongly recommended to change the standard password after ending
the installing operations.
12.3.1 ENTER THE PROTECTED LEVEL
1. Enter the Programming mode by pressing SET+DOWN buttons for 3 sec (°C or °F LED starts
blinking)
2. Released the buttons and then search for submenu Pr2
3. Per SET button and then insert the password value
4. Confirm with SET. If the password is correct, the label “Pr2” will blink for some time and then
protected parameter menu will be enabled.
12.3.2 PROTECTED MENU
1. Select the parameter to modify
5. Press the SET key to display its current value
6. Use UP or DOWN to change its value
7. Press SET to store the new value and move to the following parameter
To exit: Press SET+UP or wait for 15 sec without pressing any button.
NOTE:
1. If there are no parameters into the User Level, after 3 sec the “nP” label will be displayed. Go to
submenu Pr2 and follow the previous procedure.
2. The modified value will be stored even if the programming mode ends by timeout.
3. Modify the par. PSU (when into Protected Level) to change the current password
12.3.3 MOVE PARAMETERS THROUGH LEVELS
Each parameter present into the Protected Level can be moved into the User Level by pressing both
SET+DOWN buttons. If a parameter is into the User Level, when visualized into the Protected Level it
will have also the decimal point.
12.4 KEYBOARD MANAGEMENT
12.4.1 TEMPORARY LOCK
1. Keep both UP and DOWN buttons pressed for more than 3 sec.
2. The “oFF” label will be displayed and the keyboard will be locked. If any button is pressed more
than 3 sec, the “oFF” message will be displayed.
12.4.2 TEMPORARY UNLOCK
Keep both UP and DOWN buttons pressed together for more than 3 sec till the “on” message will be
displayed.
12.4.3 ADVANCED LOCK FUNCTION
It is possible to selectively lock the keyboard by using the following parameters:
1. brd: select the kind of lock:
a. UnL: all buttons unlocked
b. SEL: buttons UP, DOWN and DEFROST are locked
c. ALL: all keyboard is locked
2. tLC: delay after power-on before activating the advanced lock function
NOTE: when advanced lock function is active, temporary lock and unlock functions are disabled.
12.5 THE ON/OFF FUNCTION
If onF = oFF, the instrument will be switched off by pushing the ON/OFF button. The
“OFF”message will appear on the display. In this configuration the regulation is
disabled. To switch the instrument on, push again the ON/OFF button.
WARNING: any load connected to the normally closed contacts of the relays is always supplied
from the main voltage, even if the instrument is in standby mode.
13 PARAMETERS
MENU LIST
rEG
Regulation: it includes all parameters related to main temperature regulation
Prb
Probe setup: it includes all parameters related to probe configuration
diS
Display: it includes all parameters related to the user interface
dEF
Defrost: it includes all parameters to control any defrost operation
FAn
Ventilators: it includes all parameters to control the ventilators
AUS
Auxiliary: it includes all parameters for auxiliary regulators
ALr
Alarms: it includes all parameters to set up the alarm conditions
oUt
Outputs: it includes all parameters to set up the digital outputs
inP
Inputs: it includes all parameters to set up the digital inputs
ES
Energy Saving: it includes all parameters to define the energy saving mode
Cnt
Counters: to see the counters values
rtC
Real Time Clock: it includes all parameters to set up the internal clock
bLE
Bluetooth: it includes all parameters to set up the Bluetooth communication
E2
EEPROM: it includes all parameters to set up the datalogger
oth
Other: it includes all parameters to set up the serial communication and the keyboard
viS
Visualization: it includes the read only parameters (probe values and FW info)
REGULATION - rEG
SEt
Regulation Set Point: range from LS to US
LS
Minimum Set Point: (-100.0°C to SET; -148°F to SET) sets the minimum value for the set
point.
US
Maximum Set Point: (SET to 200.0°C; SET to 392°F) set the maximum value for set point.
HY
Differential in normal mode: (0.1 to 25.0°C; 1 to 45°F) differential for set point. Compressor
Cut-IN is T > SET + HY. Compressor Cut-OUT is T<=SET.
HYE
Differential in energy saving mode: (0.1 to 25.0°C; 1 to 45°F) differential for set point.
Compressor Cut-IN is T > SET + HES + HYE. Compressor Cut-OUT is T<= SET + HES.
odS
Outputs delay activation after power on: (0 to 255 min) this function is enabled after the
power-on of the instrument and delays output activations.
AC
Anti-short cycle delay: (0 to 50 min) minimum interval between a compressor stop and the
following restart.
AC1
Second compressor anti-short-cycle delay: (0 to 255 sec) delay before activating second
compressor, depending on regulation mode selected by par. 2CC
2CC
Activation mode for second compressor (valid if oAx=CP1 and oAy=CP2): (FUL; HAF)
FUL=second compressor activated in parallel with first one. HAF=second compressor activated
with step logic.
rCC
Compressors rotation enabled: (n;Y) n= CP1 is always the first compressor activated. Y=
CP1 and CP2 activation is alternated
MCo
Maximum time with compressor active: (0 to 255min) maximum time with ONOFF
compressor active. With MCo=0 this function is disabled.
rtr
Percentage for regulation: 100=P1 only; 0=P2 only
CCt
Maximum duration for pull down: (0.0 to 23h50min, res. 10min) after elapsing this interval of
time the super cooling function is immediately stopped
CCS
Differential for pull down: (-12.0 to 12.0°C; -21 to 21°F) during any super cooling phase the
regulation SETPOINT is moved to SET+CCS (in normal mode) or to SET+HES+CCS (in
energy saving mode)
oHt
Overheating before activating the pull-down function (when in normal mode): (1.0 to
12.0°C; 1 to 21°F) this is the upper threshold limit used to activate the super cooling function.
oHE
Overheating before activating the pull-down function (when in energy saving mode): (1.0
to 12.0°C; 1 to 21°F) this is the upper threshold limit used to activate the super cooling
function.
Con
Compressor ON time with faulty probe: (0 to 255 min) time during which the compressor is
active in case of faulty thermostat probe. With CY=0 compressor is always OFF.
CoF
Compressor OFF time with faulty probe: (0 to 255 min) time during which the compressor is
OFF in case of faulty thermostat probe. With Cn=0 compressor is always active.
HY1
Differential for proportional regulation: (0.1 to 25.5°C; 1 to 45°F) differential for proportional
regulation band. It is used when
PROBE SETUP - Prb
PbC
Probe selection: ntC; PtC; Pt1000
ot
Probe P1 calibration: (-12.0 to 12.0°C; -21 to 21°F) allows to adjust any possible offset of the
first probe.
P2P
Evaporator probe presence: n= not present; Y= the defrost stops by temperature.
oE
Evaporator probe calibration: -12.0 to 12.0°C; -21 to 21°F) allows to adjust any possible
offset of the third probe.
P3P
Third probe presence: n= not present; Y= the defrost stops by temperature.
o3
Third probe calibration: -12.0 to 12.0°C; -21 to 21°F) allows to adjust any possible offset of
the third probe.
P4P
Fourth probe presence: n= not present; Y= the condenser temperature alarm is managed.
o4
Fourth probe calibration: (-12.0 to 12.0°C; -21 to 21°F) allows to adjust any possible offset of
the condenser probe.
DISPLAY - diS
iCo
Enabling icon visualisation: (n; Y) the icons can be hidden during normal functioning
CF
Temperature measurement unit: (°C; °F) °C = Celsius; °F = Fahrenheit.
rES
Resolution (only for °C): (dE; in) dE = decimal; in = integer.
Lod
Probe displayed: (P1; P2; P3; P4; SEt; dtr; USr) Px=probe “x”; SEt=set point; dtr=do not
use it; USr=do not use it.
dLY
Temperature visualization delay: (0.0 to 20min00sec, res. 10 sec) when the temperature
increases, the display is updated of 1°C or 1°F after this time.
dtr
Visualization percentage = F(P1;P2): (0 to 100) with dtr=1 the display will show this value
VALUE=0.01*P1+0.99*P2
DEFROST - dEF
EdF
Defrost mode: in=fixed intervals; rtC=following real time clock
tdF
Defrost type: EL=electrical heaters; in=hot gas; ALt=uses only for compressor stop defrost.
dFP
Probe selection for defrost control: nP=no probe; P1=thermostat probe; P2=evaporator
probe; P3=third probe (do not use it); P4=Probe on Hot Key plug.
dtE
Defrost termination temperature for defrost control: (-55 to 50°C; -67 to 122°F) it sets the
temperature measured by the evaporator probe (dFP), which causes the end of defrost.
idF
Interval between two consecutives defrost cycles: (0 to 255 hours) determines the time
interval between the beginnings of two defrosting cycles.
MdF
Maximum length for defrost: (0 to 255 min; 0 means no defrost) when P2P=n (no evaporator
probe presence) it sets the defrost duration, when P2P=Y (defrost end based on evaporator
temperature) it sets the maximum length for defrost.
dSd
Start defrost delay: (0 to 255 min) delay in defrost activation.

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StC
Compressor stop time before starting any defrost: (0 to 900 sec) interval with compressor
stopped before activating hot gas cycle
dFd
Display during defrost: (rt; it; SP; dF) rt = real temperature; it = start defrost temperature;
SP = SET-POINT; dF = label “dF”.
dAd
Max delay for updating display after any defrost: (0 to 255 min) delay before updating the
temperature on the display after finishing any defrost.
Fdt
Draining time: (0 to 255 min)
Hon
Drain heater enabled after draining time (Fdt): (0 to 255 min) the relative output will stay on
after draining time.
dPo
First defrost after start-up: (n; Y) to enable defrost at power on.
Pd1
Differential during any pre-defrost phase: (-12.0 to 12.0°C; -21 to 21°F) the regulation Set
Point is changed to a temporary different value before any defrost
Pd2
Pre-defrost time: (0 to 120 min) interval with temporary Set Point before any defrost.
dAF
Defrost delay after freezing: (0.0 to 24h00min, res. 10 min) delay before activating a defrost.
od1
Automatic defrost (at the beginning of any energy saving mode): (n; Y) n=function
disabled; Y=function enabled
SYn
Tipe of synchronized defrost: (nu; SYn; rnd) nu=not used; SYn=synchronized; rnd=random
defrost
ndE
Number of devices connected to the virtual network for random defrost (valid if
Syd=rnd): (1 to 20) used to define how many devices will use the Random Defrost Function
FAN - FAn
FAP
Probe selection for evaporator fan management: nP=no probe; P1=thermostat probe;
P2=evaporator probe; P3=do not use it; P4=Probe on Hot Key plug.
FSt
Evaporator fan stop temperature: (-55 to 50°C; -67 to 122°F) setting of temperature,
detected by evaporator probe. Over this value of temperature fans are always OFF. NOTE: it
works only for the evaporator fan, NOT for the condenser fan.
HYF
Differential for evaporator fan: (0.1 to 25.5°C; 1 to 45°F) differential for evaporator ventilator
regulator
FnC
Evaporator fan mode operation: (Cn; on; CY; oY)
•Cn = runs with the compressor, duty-cycle when compressor is OFF (see FoF,Fon,
FF1 and Fo1 parameters) and OFF during defrost
•on = continuous mode, OFF during defrost
•CY = runs with the compressor, duty-cycle when compressor is OFF (see FoF,Fon,
FF1 and Fo1 parameters) and ON during defrost
•oY = continuous mode, ON during defrost
Fnd
Fan delay after defrost: (0 to 255 min) delay before fan activation after any defrosts.
FCt
Differential of temperature for forced activation of fans
Fon
Fan on time when the compressor is off: (0 to 255 min) used when energy saving status is
not active.
FoF
Fan off time when the compressor is off: (0 to 255 min) used when energy saving status is
not active.
Fo1
Fan on time with compressor off in Energy Saving mode: (0 to 255 min) used when energy
saving status is active.
FF1
Fan off time with compressor off in Energy Saving mode: (0 to 255 min) used when energy
saving status is active.
FAC
Probe selection for condenser fan management: nP=no probe; P1=probe Pb1; P2=probe
Pb2; P3=probe Pb3; P4=probe Pb4 on Hot Key plug.
St2
Condenser fan stop temperature: (-55 to 50°C; -67 to 122°F) setting of temperature,
detected by evaporator probe. Over this value of temperature fans are always OFF.
HY2
Differential for condenser fan: (0.1 to 25.5°C; 1 to 45°F) differential for evaporator ventilator
regulator
FCC
Condenser fan mode operation: (Cn; on; CY; oY)
•Cn = runs with the compressor and OFF during defrost
•on = continuous mode, OFF during defrost
•CY = runs with the compressor and ON during defrost
•oY = continuous mode, ON during defrost
AUXILIARY OUTPUT MANAGEMENT - 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 relay: (0.1 to 25.5°C; 1 to 45°F) 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 relay: (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 = do not use it; P4 = Probe 4.
Sdd
Auxiliary relay switched off during defrost: (n; Y) n= the auxiliary relay operates during
defrost. Y= the auxiliary relay is switched off during defrost.
btA
Base Time for timed activation of auxiliary output: (SEC; Min) SEC=base time is in second
Ato
AUX output in ON state: 0 to 255 (base time defined in par. btA)
AtF
AUX output in OFF state: 0 to 255 (base time defined in par. btA)
ALARMS - ALr
ALP
Temperature alarms probe selection: (P1, P2, P3, P4)
ALC
Temperature alarms configuration: (Ab, rE) Ab = absolute; rE = relative.
ALU
Maximum temperature alarm: when this temperature is reached, the alarm is enabled after
the Ad delay time.
•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.
ALL
Minimum temperature alarm: when this temperature is reached, the alarm is enabled after the
Ad delay time.
•If ALC=Ab -55.0°C to ALU or -67°F to ALU.
•If ALC=rE 0.0 to 50.0°C or 0 to 90°F.
AFH
Differential for temperature alarm recovery: (0.1 to 25.0°C; 1 to 45°F) differential for alarms.
ALd
Temperature alarm delay: (0 to 255 min) delay time between the detection of an alarm
condition and the relative alarm signalling.
Dot
Delay of temperature alarm with door open: (0.0 to 24h00min, res. 10 min) delay time
between the detection of a temperature alarm condition and the relative alarm signalling, after
powering on the instrument.
dAo
Delay of temperature alarm at start up: (0.0 to 24h00min, res. 10 min) delay time between
the detection of a temperature alarm condition and the relative alarm signalling, after powering
on the instrument.
CONDENSER TEMPERATURE ALARM - ALr
AP2
Probe selection for second temperature alarms: (nP; P1; P2; P3; P4) nP=no probe;
P1=thermostat probe; P2=evaporator probe; P3=do not use it; P4=Probe on Hot Key plug
AU1
Second high temperature pre-alarm: (-55.0 to 150.0°C; -67 to 302°F)
AH1
Differential for second temperature pre-alarm recovery: (0.1 to 25.0°C; 1 to 45°F)
Ad1
Second temperature pre-alarm delay: (0 to 255 min; 255 = not used) delay time between the
detection of a condenser pre-alarm condition and the relative alarm signaling.
AL2
Second low temperature alarm: (-55.0 to 150.0°C; -67 to 302°F)
AU2
Second high temperature alarm: (-55.0 to 150.0°C; -67 to 302°F)
AH2
Differential for second temperature alarm recovery: (0.1 to 25.0°C; 1 to 45°F)
Ad2
Second temperature alarm delay: (0 to 255 min; 255 = not used) delay time between the
detection of a condenser alarm condition and the relative alarm signaling.
dA2
Delay for second temperature alarm at start up: (0.0 to 24h00min, res. 10 min)
bLL
Compressor off because of second low temperature alarm: (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.
AC2
Compressor off because of second high temperature alarm: (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.
SAF
Differential for anti freezing control: (-12.0 to 12.0°C; -21.0 to 21.0°F) regulation sopped if
T<SET+SAF
DIGITAL OUTPUT MANAGEMENT - oUt
tbA
Alarm muting: (n; Y) to disable the (optional) buzzer and the output configured as alarm.
oAx
(x=1,2,3,4)
Output configuration: (nu; CP1; dEF; FAn; ALr; LiG; AUS; db; onF; HES; Cnd) nu=not
used; CP1=compressor; dEF=defrost; FAn=ventilators; ALr=alarm; LiG=light;
AUS=Auxiliary relay; onF=always on with instrument on; db=neutral zone; HES=night
blinds; Cnd=Condenser fan; CP2=second compressor; dF2=second defrost; HEt=heater
control; inV=do not use it.
AoP
Alarm relay polarity: (oP; CL) oP = alarm activated by closing the contact; CL = alarm
activated by opening the contact
DIGITAL INPUTS - inP
ibt
Base time for digital inputs: (SEC; Min) SEC = seconds; Min = minutes. Delay for activating
the function linked to the digital inputs.
i1P
Digital input 1 polarity: (oP; CL) oP = activated by closing the contact; CL = activated by
opening the contact.
i1F
Digital input 1 configuration: (nu; dor; dEF; AUS; ES; EAL; bAL; PAL; FAn; HdF; onF; LiG;
CC; EMt)
•nu=not used
•dor = door switch function
•dEF = defrost activation
•AUS = auxiliary output
•ES = energy saving mode activation
•EAL = external warning alarm
•bAL = external lock alarm
•PAL = external pressure alarm
•FAn = evaporator fan control
•HdF = holiday defrost
•onF = ON/OFF status change
•LiG = light output control
•CC = change configuration (between C1 and C2)
•EMt = do not use it
did
Digital inputs 1 alarm delay: (0 to 255) it is the delay between the detection of an external
event and the activation of the relative function.
i2P
Digital input 2 polarity (if d.i.2 present): (oP; CL) oP = activated by closing the contact; CL =
activated by opening the contact.
i2F
Digital input 2 configuration: (nu; dor; dEF; AUS; ES; EAL; bAL; PAL; FAn; HdF; onF; LiG;
CC; EMt)
•nu=not used
•dor = door switch function
•dEF = defrost activation
•AUS = auxiliary output
•ES = energy saving mode activation
•EAL = external warning alarm
•bAL = external lock alarm
•PAL = external pressure alarm
•FAn = evaporator fan control
•HdF = holiday defrost
•onF = ON/OFF status change
•LiG = light output control
•CC = change configuration (between C1 and C2)
•EMt = Motion detector
d2d
Digital inputs 2 alarm delay: (0 to 255) it is the delay between the detection of an external
event and the activation of the relative function.
nPS
Number of external pressure alarms before stopping the regulation: (0 to 15) after
reaching nPS events in the digital input alarm delay (par. dxd) the regulation will be stopped
and a manual restart (ON/OFF, power OFF and power ON) will be required
odC
Compressor and fan status after door opening: (no; FAn; CPr; F-C): no = normal;
FAn = Fans OFF; CPr= Compressor OFF; F-C = Compressor and fans OFF.
rrd
Regulation restart after door open alarm: (n; Y) n= no regulation if door is opened; Y= when
didis elapsed, regulation restarts even if a door open alarm is present.
LCi
Light output controlled by digital input: (0 to 255 min) a digital input event will activate the
light output and the output will stay ON for this interval
ENERGY SAVING - ES
HES
Differential for energy saving mode: (-30.0 to 30.0°C; -54 to 54°F) it sets the increasing
value of the set point during the Energy Saving cycle.
LdE
Energy saving mode controls the lights: (n; Y) lights off when energy saving mode is active

1592034020 XR77CHC EN r1.0 2019.01.31 XR77CHC 5/7
StE
Period to switch from normal mode to energy saving mode (valid if ErA=bAS): (0.0 to
24h00min, res. 10 min) if door stay closed for StE time, the energy saving mode will be
activated. NOTE: this will require a door switch to work.
EtS
Period to switch from energy saving mode to normal mode (valid if ErA=bAS): (0.0 to
24h00min, res. 10 min) maximum time for energy saving mode. NOTE: this will require a door
switch to work.
dS
Door open time to switch from EtS to StE (valid if ErA=bAS): (0 to 999 sec) the energy
saving mode will be immediately deactivated as soon as the door stay open more than the dS
time. NOTE: this will require a door switch to work.
TOTAL COUNTERS - Cnt
n1H
Number of relay output 1 activations (thousands of) (read only)
n1L
Number of relay output 1 activations (hundreds of) (read only)
n2H
Number of relay output 2 activations (thousands of) (read only)
n2L
Number of relay output 2 activations (hundreds of) (read only)
n3H
Number of relay output 3 activations (hundreds of) (read only)
n3L
Number of relay output 3 activations (hundreds of) (read only)
n4H
Number of relay output 4 activations (thousands of) (read only)
n4L
Number of relay output 4 activations (hundreds of) (read only)
n5d
Number of daily activations of digital input 1 (read only)
n5H
Number of digital input 1 activations (thousands of) (read only)
n5L
Number of digital input 1 activations (hundreds of) (read only)
n6d
Number of daily activations of digital input 2 (read only)
n6H
Number of digital input 2 activations (thousands of) (read only)
n6L
Number of digital input 2 activations (hundreds of) (read only)
F1H
Number of working hours for relay output oA1 (thousands of) (read only)
F1L
Number of working hours for relay output oA1 (hundreds of) (read only)
F2H
Number of working hours for relay output oA2 (thousands of) (read only)
F2L
Number of working hours for relay output oA2 (hundreds of) (read only)
F3H
Number of working hours for relay output oA3 (thousands of) (read only)
F3L
Number of working hours for relay output oA3 (hundreds of) (read only)
F4H
Number of working hours for relay output oA4 (thousands of) (read only)
F4L
Number of working hours for relay output oA4 (hundreds of) (read only)
REAL TIME CLOCK MENU - rtC
Hur
Hours: 0 to 23 hours
Min
Minutes: 0 to 59 minutes
dAY
Day of the week: Sun to Sat
dYM
Day of the month: 1 to 31
Mon
Month: 1 to 12
YAr
Year: 00 to 99
Hd1
First day of the weekend: (Sun to Sat; nu) set the first day of the week which follows
the holiday times.
Hd2
Second day of the weekend: (Sun to Sat; nu) set the second day of the week which
follows the holiday times.
iLE
Working day energy saving starting time: (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
Working day energy saving duration: (0 to 24h00min) sets the duration of the Energy
Saving cycle on workdays.
iSE
Holyday energy saving starting time: 0 to 23h50min.
dSE
Holyday energy saving duration: 0 to 24h00min.
dd1…dd6
Daily defrost enabled: (n; Y) to enable the Ld1…Ld6 defrost operations for any day of
the week.
Ld1…Ld6
Daily defrost starting time: (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.
N.B.: To disable a defrost cycle set it to “nu” (not used). Ex: if Ld6=nu; the sixth defrost cycle will be disabled.
BLUETOOTH - bLE
btM
Bluetooth Mode: (0; 1; 2) define the pairing&bonding method:
-0=6-digit PIN is required for pairing&bonding
-1,2=no PIN required (just works mode)
rPS
Reset owner password: (n;Y) select and confirm YES to come back to default factory
configuration. NOTE: remember to cancel the device also from the Cloud database (click on
“Delete” link present on the right of the appliance card present on the “Permissions” webpage.
rLi
Reset whitelist: (n;Y) select and confirm YES for reset the device whitelist and come back to
default factory configuration.
EEPROM –E2
rSC
Reset Daily Counters: used to reset the daily counters memory. Please note that after
selecting rSC=Y the device will take some time to complete the operation. During the reset
phase, the display will show some blinking lines.
OTHER - oth
Adr
Serial address: (1 to 247) device address for Modbus communication
bAU
Baudrate: (9.6; 19.2; 38.4; 57.6) select the correct baudrate for serial communication
brd
Keyboard lock type: (nu; SEL; ALL) UnL=keyboard unlocked; SEL=only SET and DEF/AUX
button enabled when locked; ALL=keyboard unlocked after tLC.
tLC
Keyboard lock timeout: (0 to 255 sec) timeout after power-on and before activating the
keyboard lock
LGC
Light button configuration (left upper side): nu=not used; LiG=light output control;
AUS=auxiliary output control; dEF=defrost control; Pb2=probe 2 value visualization;
ES=change working mode from normal to energy saving mode and vice-versa;
LG2
Light button timed (3sec) configuration (left upper side): nu=not used; LiG=light output
control; AUS=auxiliary output control; dEF=defrost control; CC=change configuration between
NT and LT map; ES=change working mode from normal to energy saving mode and vice-versa;
UP2
Up button timed (3sec) configuration: nu=not used; Std=standard function; LdC=load
default configuration (factory values); Pdn=pull down activation
VISUALIZATION - ViS
d1
Probe P1 value visualization
d2
Probe P2 value visualization
d3
Probe P3 value visualization
d4
Probe P4 value visualization
rSE
Real Set point
FdY
Firmware release date: day
FMt
Firmware release date: month
FYr
Firmware release date: year
rEL
Firmware release: progressive number
Sub
Firmware sub release: progressive number
Ptb
Parameter code table
14 DIGITAL INPUTS
The free voltage digital input is programmable in different configurations by the i1F and i2F.
DOOR SWITCH (ixF=dor)
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 did, the door alarm is enabled,
the display shows the message “dA”and the regulation restarts if rrd = 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.
START DEFROST (ixF=dEF)
It starts a defrost if there are the right conditions. After finishing any defrost, the normal regulation will
restart only if the digital input is disabled, otherwise the instrument will wait until the MdF safety time is
expired.
ENERGY SAVING (ixF=ES)
The energy saving mode will be enabled / disabled with the digital input.
MOTION SENSOR (ixF=EMt)
It counts the motion sensor detections.
AUXILIARY OUTPUT (ixF=AUS)
The AUX output (if present and configured) will be enabled / disabled with the digital input.
EXTERNAL WARNING ALARM (ixF=EAL)
It is used to detect an external alarm. It does not lock the regulation.
EXTERNAL LOCK ALARM (ixF=bAL)
It is used to detect any critical external alarm. It locks immediately the regulation.
EXTERNAL PRESSURE ALARM (ixF=PAL)
It is used to detect any pressure external alarm. This signal locks the regulation after nPS events in
dxd interval od time.
EVAPORATOR FAN MODE (ixF=FAn)
It is used to control the evaporator fan.
REMOTE HOLYDAY MODE (ixF=HdF)
It is used to force the holyday mode.
REMOTE ONOFF (ixF=onF)
It is used to switch ON and OFF the device remotely.
LIGHT OUTPUT (ixF=LiG)
It is used to control the light output.
CHANGE CONFIGURATION (ixF=CC)
It is used to change the controller configuration.
MOTION SENSOR DETECTOR (ixF=EMt)
To use the X-MOD motion sensor. Please note that motion sensor can be connected only to the
HOTKEY port, so it needs digital input 2 properly configurated.
15 INSTALLATION AND MOUNTING
Instrument XR77CHC 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.
16 OPTIONAL FEATURES
The MDP/CX rear cover can be used to increase the protection
from water and dust.
The HOT-KEY is used for a quick and easy upload (from device
to HOT-KEY) or download (from HOT-KEY to device) the
parameter map.
The XJ485LE serial interface converts the TTL output into an
RS485 signal that can be used to connect the unit to the
controlling and supervising system. Please note that other
version of this converter does not work with XR-CHC devices.
17 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

1592034020 XR77CHC EN r1.0 2019.01.31 XR77CHC 6/7
power connections. Do not exceed the maximum current allowed on each relay, in case of heavier
loads use a suitable external relay.
17.1 PROBES
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.
18 USE THE HOT-KEY
18.1 SAVE PARAMETERS IN A HOT-KEY (UPLOAD FROM INSTRUMENT)
1. Program one controller with the front keypad.
2. When the controller is ON, insert the “HOT-KEY” and push UP button; the “UP”message
appears followed a by flashing “End”
3. Push “SET” key and the “End”will stop flashing.
4. Turn OFF the instrument and then remove the “HOT-KEY”. At the end turn the instrument ON
again.
NOTE: the “Err” message appears in case of a failed programming operation. In this case push again
the UP button if you want to restart the upload again or remove the “HOT-KEY” to abort the operation.
18.2 COPY PARAMETERS FROM A HOT-KEY (DOWNLOAD PARAMETER
VALUES)
1. Turn OFF the instrument.
2. Insert a programmed “HOT-KEY” into the 5-PIN port and then turn the Controller ON.
3. The parameter list of the “HOT-KEY” is automatically copied into the controller memory. During
this operation the “do” message will blink
4. A flashing “End” label will inform that the operation was successful
5. Remove the “HOT-KEY”.
6. After some seconds the instrument will restart, using with the new parameters.
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.
19 INTERNAL MEMORY
The controller has an internal memory where are stored:
-Two different parameter maps identified as C1 and C2
-Factory default configurations for both C1 and C2 parameters map
The controller is always shipped with:
-Parameter map C1 = factory default configuration C1
-Parameter map C2= factory default configuration C2
Any modification to parameter map C1 or C2 does not change the default factory values.
It is possible to change parameter map between C1 and C2 by using a digital input or a button properly
configurated (ixF or LG2=CC).
It is possible to restore factory defaults values for both C1 or C2 parameters map by using UP2=LdC (Load
default configuration) function.
NOTES:
-If controller is using C1 parameter map, the factory default configuration C1 will be reloaded
overwriting C1 parameter map. The same for parameter map C2.
-The factory default configurations are read only (it is not possible to modify them on the field).
20 ALARM SIGNALLING
Label
Cause
Outputs
“oFF”
Keyboard locked
Outputs unchanged
“on”
Keyboard unlocked
Outputs unchanged
“P1”
Room probe failure
Compressor output according to Con e CoF
“P2”
Evaporator probe failure
Defrost end is timed
“P3”
Third probe failure
Depends on the alarms
“P4”
Fourth probe failure
Linked temperature alarm is not managed
“HA”
Maximum temperature alarm
Outputs unchanged
“LA”
Minimum temperature alarm
Outputs unchanged
“H2”
Maximum temperature for second
temperature alarm
Outputs unchanged
“L2”
Minimum temperature for second
temperature alarm
Outputs unchanged
“dA”
Door open more than dxd time
Compressor and fans restarts
“EA”
External alarm
Outputs unchanged
“CA”
Serious external alarm
Outputs disabled
“EE”
EEPROM alarm
Outputs unchanged
20.1 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. Temperature alarms “HA”, “LA”, “H2” and “L2” automatically stop as soon as the
temperature returns to normal values. It is possible to reset the “EE” alarm by pressing any button.
The alarms “EA”, “CA” and “dA” will automatically stop as soon as the digital input is disabled.
The internal buzzer can be muted by pressing any key if parameter tbA=Y.
21 TECHNICAL DATA
Housing: self-extinguishing ABS
Case: frontal 32x74 mm; depth 60mm
Mounting: panel mounting in a 71x29mm panel cut-out
Body Protection: IP20
Frontal protection: IP65
Terminal blocks: plug-in terminal blocks 2.5 mm2wiring
Power supply: (according to the model) 230Vac 10%, 50/60Hz; 110Vac 10%, 50/60Hz
Power absorption: 3.5VA max
Display: 3-digit LED, H=14.2 mm
Inputs: up to 4 NTC, PTC or PT1000 probes
Digital input: up to 2 voltage free contacts
Relay outputs: Compressor SPST 16(5)A, 250VAC
oA2: SPDT 16(5)A, 250VAC
oA3: SPST 5(2)A, 250VAC
oA4: SPDT 7A, 250VAC
Data storing: EEPROM
Kind of action: 1B
Pollution degree: 2
Software class: A
Rated impulsive voltage: 2500V; Overvoltage Category: II
Operating temperature: 0 to 60°C (32 to 140°F)
Storage temperature: -25 to 60°C (-13 to 140°F)
Relative humidity: 20 to 85% (no condensing)
Measuring and regulation range:
NTC -40 to 110°C (-40 to 230°F)
PTC -55 to 150°C (-67 to 302°F)
PT1000 -100 to 200°C (-148 to 392°F)
Resolution: 0.1°C or 1°C (selectable)
Accuracy (ambient temp. 25°C):
NTC or PTC: ±0.1°C ±1 digit
PT1000: ±0.1°C ±1 digit for probes Pb1, Pb2 and Pb3; ±1.0°C ±1 digit for probe Pb4
Real time clock: data maintenance up to 6 months with lithium battery
HOT-KEY inputs: MAX voltage allowed is 3.3VDC. DO NOT CONNECT ANY EXTERNAL POWER
SUPPLY.
21.1 STANDARDS
The complete Declaration of Conformity can be found at:
https://dxapp.cloud/
21.1.1 THE XR77CHC IS COMPLIANT WITH THE FOLLOWING STANDARDS
ETSI EN 300 328 V2.1.1 (2016-11)
ETSI EN 301 489-17 V3.1.1 (2016-11)
IEC EN 60730-2-9: 2008 (Third Edition) and Am.1:2011 in conjunction with IEC 60730-1:2010 (Fourth Edition)
UL 60730-1 Fourth Edition and CAN/CSA-E60730-1:02 Third Edition along with its Amendment 1 dated
February 2007, the Standards for Automatic electrical controls for household and similar use –Part 1: General
requirements.
It therefore meets the essential requirements of the following Directives:
Radio equipment Directive 2014/53/EU
Electromagnetic compatibility 2004/108/EC
Low Voltage equipment 2006/95/EC
21.1.2 THE XR77CHC IS COMPLIANT WITH THE FOLLOWING STANDARDS
FCC 15.247
21.1.3 THE XR77CHC IS COMPLIANT TO PART 15 OF THE FCC RULE
Operation is subject to the following two conditions:
(1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that may cause undesired
operation.”
Unauthorized repairs, changes or modifications could result in permanent damage to the equipment and void
your warranty and your authority to operate this device under Part 15 of the FCC Rules.
NOTE: This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against
harmful interference when the equipment is operated in a commercial environment. This equipment generates,
uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction
manual, may cause harmful interference to radio communications. Operation of this equipment in a residential
area is likely to cause harmful interference in which case the user will be required to correct the interference at
his own expense.
21.1.4 THE XR77CHC IS COMPLIANT TO RSS 102
This device complies with Industry Canada RSS-210. Operation is subject to the following two conditions: (1)
this device may not cause interference, and (2) this device must accept any interference, including
interference that may cause undesired operation of the device.
21.1.5 CET XR77CHC INSTRUMENT REPOND AUX NORMES RSS 102
Le présent appareil est conforme aux CNR d’Industrie Canada applicables aux appareils radio RSS-210.
L’exploitation est autorisée aux deux conditions suivantes : (1) l’appareil ne doit pas produire de brouillage, et
(2) l’utilisateur de l’appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est
susceptible d’en compromettre le fonctionnement.
22 WIRINGS
22.1 XR77CHC, 16+16+7+5A
Power Supply (terminals 2-3):
110 or 230 Vac @50 or 60Hz

1592034020 XR77CHC EN r1.0 2019.01.31 XR77CHC 7/7
23 BLUETOOTH COMMUNICATION
The controller implements a Bluetooth 4.2 communication module. This gives
the possibility to communicate with external devices (for example with a mobile
APP able to recognize and decode the device). All controllers use a unique
MAC-ADDRESS, which is used both for identification and communication. The
communication range is about 5 m (worst case, indoor coverage in presence of
obstacles). Over this distance it is possible to suffer interruptions in the
communication or quality degradation of the communication. A 6-digit pairing
secure code can be required for connection. Please follow the Emerson
Connected APP instruction for more information.
23.1 FIRST INSTALLATION
After installation, it will be possible to manage the controller by using the Emerson Connected APP. Il will be
required to:
-Install the Emerson Connected APP on your mobile device (smartphone or tablet)
-Create a new user account before using the APP
The owner is the only account that can:
-Manage the controller via Bluetooth
-Extend rights of access to a specific appliance also to other users
A Cloud portal will be used for:
-Extend rights of access to a specific appliance also to other users
-Select the permission level for any new user
The link for opening the Cloud webpage is on the left side menu of the mobile APP (slide right the screen of
the APP when on the Device List page and follow the “Cloud management” link. Please note that the login and
password for the Cloud webpage are the same of the mobile APP.
23.2 RESET TO FACTORY DEFAULT
In case a factory reset is required, please follow these operations:
-Access to the Cloud webpage and select the appliance you want to reset (search for name
and/or MAC-ADDRESS)
-Click on the “DELETE” link, the appliance will be removed from the list of owned appliances
-Go to the device controller (with the same MAC-ADDRESS)
-Enter the programming mode
-Go to the “bLE” menu
-Select the par. rPS (reset device ownership)
-Select “Y” and confirm with SET button
-Select the par. rLi (reset device whitelist)
-Select “Y” and confirm with SET button
-Exit from the programming menu
-Logout and login from the mobile APP
After this, the controller will be reset to factory default configuration and it will be ready for a new association.