1592034020 XR77CHC EN r1.0 2019.01.31 XR77CHC 1/7
DIGITAL CONTROLLER WITH
BLUETOOTH CONNECTIVITY
XR77CHC
82 rel. 1.0.1
1 GENERAL WARNINGS ................................................................................................................................... 1
2 GENERAL DESCRIPTION .............................................................................................................................. 1
3 REGULATION .................................................................................................................................................. 1
4 SECOND COMPRESSOR .............................................................................................................................. 1
5 ENERGY SAVING ALGORITHM .................................................................................................................... 1
6 PULL DOWN FUNCTION ................................................................................................................................ 1
7 EVAPORATOR FANS ..................................................................................................................................... 1
8 CONDENSER FAN .......................................................................................................................................... 2
9 DEFROST ........................................................................................................................................................ 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
1 GENERAL 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.
2 GENERAL 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.
3 REGULATION
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.
4 SECOND 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:
Compressor anti-short-cycle delay
Second compressor anti-short-cycle delay
Activation mode for second compressor (valid if oAx=CP1 and oAy=CP2)
Compressors rotation enabled
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.
5 ENERGY 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)
- Pushing the DOWN button for 3 sec (if enabled).
- Door continuously closed for the StE time.
- 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 StE are
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:
6 PULL 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.
7 EVAPORATOR 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:
o FnC=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).
o FnC=o-n: evaporator fan will run even if the compressor is off, and will not run
during defrost;
o FnC=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).
o FnC=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.
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