Emerson Dixell XR35CX - 110VAC User manual

026-1203 Rev 3 03-FEB-2015
XR35CX Digital Controller for Medium
Temperature Refrigeration Applications
Installation and Operation Manual

Emerson Climate Technologies Retail Solutions
1065 Big Shanty Rd., NW Suite 100
Kennesaw, GA 30144 USA
Phone: [phone]
Fax: [phone]

Table of Contents • v
Table of Contents
1 INTRODUCTION.......................................................................................................................................................... 1
1.1. GENERAL WARNING ..................................................................................................................................................... 1
2 OVERVIEW ................................................................................................................................................................... 1
2.1. GENERAL DESCRIPTION................................................................................................................................................ 1
2.2. ORDERING CODE .......................................................................................................................................................... 1
3 CONTROLLING LOADS ............................................................................................................................................ 2
3.1. COMPRESSOR ................................................................................................................................................................ 2
3.2. DEFROST ....................................................................................................................................................................... 2
3.3. SECOND RELAY CONFIGURATION (PAR. OA1; TERM. 1-7) ....................................................................................... 2
3.3.1. Defrost Relay (oA1 = dEF)................................................................................................................................... 2
3.3.2. Light Relay ............................................................................................................................................................ 2
3.3.3. Auxiliary Relay (oA1 = AUS)................................................................................................................................ 2
3.3.3.1. Relay Activation by Digital Input (oA1 = AUS, i2F = AUS) ............................................................................................ 2
3.3.3.2. Auxiliary Thermostat.......................................................................................................................................................... 2
3.3.4. ON/OFF Relay (oA1 = onF)................................................................................................................................. 2
3.3.5. Neutral Zone Regulation....................................................................................................................................... 3
3.3.6. Alarm Relay........................................................................................................................................................... 3
3.3.7. Night Blind Management During Energy Saving Cycles...................................................................................... 3
4 FRONT PANEL COMMANDS.................................................................................................................................... 4
4.1. KEYS AND FUNCTIONS ................................................................................................................................................. 4
4.2. USE OF LEDS ............................................................................................................................................................... 4
5 MAX AND MIN TEMPERATURE MEMORIZATION........................................................................................... 5
5.1. HOW TO SEE THE MIN TEMPERATURE ........................................................................................................................ 5
5.2. HOW TO SEE THE MAX TEMPERATURE....................................................................................................................... 5
5.3. HOW TO RESET MAX AND MIN TEMPERATURE RECORDED ...................................................................................... 5
6 MAIN FUNCTIONS ...................................................................................................................................................... 6
6.1. HOW TO SEE THE SETPOINT ......................................................................................................................................... 6
6.2. HOW TO CHANGE THE SETPOINT.................................................................................................................................. 6
6.3. HOW TO START AMANUAL DEFROST.......................................................................................................................... 6
6.4. HOW TO CHANGE APARAMETER VALUE..................................................................................................................... 6
6.5. THE HIDDEN MENU ...................................................................................................................................................... 6
6.5.1. How to Enter the Hidden Menu ............................................................................................................................ 6
6.5.2. How to Move a Parameter from the Hidden Menu to the First Level and Vice Versa......................................... 7
6.6. HOW TO ASSIGN AMODBUS ADDRESS ..................................................................................................................... 7
6.7. HOW TO LOCK THE KEYBOARD ................................................................................................................................... 7
6.8. TOUNLOCK THE KEYBOARD ....................................................................................................................................... 7
6.9. THE CONTINUOUS CYCLE............................................................................................................................................. 7
6.10. THE ON/OFF FUNCTION ............................................................................................................................................ 7
7 PARAMETERS.............................................................................................................................................................. 8
8 DIGITAL INPUTS....................................................................................................................................................... 14
8.1. GENERIC ALARM (I2F=EAL) ..................................................................................................................................... 14
8.2. SERIOUS ALARM MODE (I2F=BAL) ........................................................................................................................... 14

vi • XR35CX I&O Manual 026-1203 Rev 3 03-FEB-2015
8.3. PRESSURE SWITCH (I2F=PAL) ................................................................................................................................... 14
8.4. DOOR SWITCH INPUT (I1F OR I2F=DOR) .................................................................................................................... 14
8.5. START DEFROST (I1F OR I2F=DEF)............................................................................................................................ 14
8.6. SWITCH THE AUXILIARY RELAY (I2F=AUS) ............................................................................................................. 14
8.7. INVERSION OF THE KIND OF ACTION: HEATING-COOLING (I2F=HTR) ...................................................................... 14
8.8. ENERGY SAVING (I2F=ES) ......................................................................................................................................... 14
8.9. HOLIDAY DEFROST (I2F=HDF) - ONLY FOR MODELS WITH RTC ............................................................................. 14
8.10. ON/OFF FUNCTION (I2F=ONF) ................................................................................................................................ 15
8.11. DIGITAL INPUTS POLARITY....................................................................................................................................... 15
9 RS485 SERIAL LINE (FOR MONITORING SYSTEMS)...................................................................................... 16
10 X-REP OUTPUT (OPTIONAL) ............................................................................................................................... 16
11 INSTALLATION AND MOUNTING...................................................................................................................... 17
12 ELECTRICAL CONNECTIONS............................................................................................................................. 17
12.1. PROBE CONNECTION................................................................................................................................................. 17
13 HOW TO USE THE HOT KEY ............................................................................................................................... 18
13.1. HOW TO PROGRAM AHOT KEY FROM THE CONTROLLER (UPLOAD)...................................................................... 18
13.2. HOW TO PROGRAM THE CONTROLLER USING AHOT KEY (DOWNLOAD) ............................................................... 18
14 ALARM SIGNALS .................................................................................................................................................... 19
14.1. SILENCING BUZZER / ALARM RELAY OUTPUT ......................................................................................................... 19
14.2. ALARM RECOVERY ................................................................................................................................................... 19
14.3. OTHER MESSAGES .................................................................................................................................................... 19
15 SPECIFICATIONS.................................................................................................................................................... 20
16 CONNECTIONS ........................................................................................................................................................ 21
17 E2 MODBUS NETWORK WIRING ....................................................................................................................... 22
18 ECT MODBUS NETWORKING TO E2S............................................................................................................... 23
18.1. COM PORT ASSOCIATIONS - E2 VERSIONS 3.XX AND BELOW ................................................................................ 23
18.2. COM PORT ASSOCIATIONS - E2 VERSIONS 4.2 AND ABOVE ................................................................................... 23
18.3. E2 SETUP OF DEVICES .............................................................................................................................................. 24
18.3.1. Set Up Network Ports........................................................................................................................................ 24
18.3.2. Add and Connect the Device ............................................................................................................................. 24
18.4. WIRING TYPES .......................................................................................................................................................... 26
18.5. MODBUS TERMINATION BLOCKS ........................................................................................................................... 26
19 DEFAULT SETTING VALUES............................................................................................................................... 27
APPENDIX A - ALTERNATE MODBUS COM WIRING METHOD FOR E2, XR, XM, AND XEV DEVICES ..
31

General Warning Introduction • 1
1 Introduction
1.1. General Warning
Please read the following safety precautions and
warnings before using this manual:
2Overview
2.1. General Description
Model XR35CX (32 mm x 74 mm) is a digital
thermostat with off-cycle defrost, designed for refrig-
eration applications at normal temperature. It has two
(2) relay outputs to control compressor and light (con-
figurable).
It can also have up to four (4) NTC, CtC, or
PT1000 probe inputs: the first one for temperature
control, the second one located on the evaporator to
control the defrost termination temperature. One of
the two digital inputs can operate as a third tempera-
ture probe. The fourth probe is used to signal the con-
denser temperature alarm or to display a temperature
value. Set the PbC parameter to CtC to support stan-
dard CPC temperature sensors (factory default).
The RS485 serial output enables the controller to
be connected to a network line that is a MODBUS-
RTU compatible, such as the monitoring units of X-
WEB family. The Hot Key receptacle allows the con-
troller to be programmed by means of the Hot Key
programming keyboard.
The controller is fully configurable through spe-
cial parameters that can be easily programmed
through the keyboard.
2.2. Ordering Code
CAUTION!
• This manual is part of the product and
should be kept near the controller for easy and
quick reference.
• The controller should not be used for purposes
different from those described in this manual. It can-
not be used as a safety device.
• Check the application limits before proceeding.
SAFETY PRECAUTIONS AND
WARNINGS!
• Check that the supply voltage is correct
before connecting the controller.
• Do not expose to water or moisture: use the con-
troller only within the operating limits and avoid sud-
den temperature changes with high atmospheric
humidity to prevent condensation from forming.
• Warning! Disconnect all electrical connections
before performing any kind of maintenance.
• Fit the probe where it is not accessible by the end
user. The controller must not be opened.
• In case of failure or faulty operation, send the
controller back to the distributor or to Retail Solutions
(see address) with a detailed description of the fault.
• Verify the maximum current that can be applied
to each relay (see Section 15, Specifications).
• 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 environ-
ments, the use of main filters (our mod. FT1) in paral-
lel with inductive loads could be useful.
Device
Name Dixell Code Emerson Code
XR35CX -
110VAC
XR35CX -4C6F3B
X0LG1MEUB4NA-000 318-6020
XR35CX -
230VAC
XR35CX -5C6F3B
X0LG1MEUB5NA-000 318-6021
Table 2-1 - Product Ordering Code

2 • XR35CX I&O Manual 026-1203 Rev 3 03-FEB-2015
3 Controlling Loads
3.1. Compressor
The regulation is performed according to the tem-
perature measured by the thermostat probe with a pos-
itive differential from the setpoint: if the temperature
increases and reaches setpoint plus the differential,
the compressor is started and then turned OFF when
the temperature reaches the setpoint value again.
In case of a fault in the thermostat probe, the start
and stop of the compressor are timed through param-
eters Con and CoF.
3.2. Defrost
With oA1 different from dEF and tdF =EL, the
controller performs a timed defrost, simply stopping
the compressor.
With oA1 =dEF, two defrost modes are available
through the tdF parameter: defrost through electrical
heater (tdF =EL) and hot gas defrost (tdF =in); in
this case, the second relay has to be set.
The defrost interval depends on the presence of the
RTC (optional). If the RTC is present, it is controlled
by means of parameter EdF:
•WithEdF = in, the defrost is made every IdF time
– standard way for controller without RTC.
•WithEdF =rtC, the defrost is made in real time de-
pending on the hours set in the parameters
Ld1...Ld6 on workdays and in Sd1…Sd6 in holi-
days.
Other parameters are used to control defrost cy-
cles: its maximum defrost duration (MdF) and two
defrost modes: time or controlled by the evaporator’s
probe (P2P).
3.3. Second Relay
Configuration (PAR.
oA1; TERM. 1-7)
Depending on the kind of application, the function
of the second relay (terminals 1-7) can be set through
the oA1 parameter.
3.3.1. Defrost Relay (oA1 = dEF)
With oA1 =dEF, the relay functions as a defrost
relay. See Section 3.2., Defrost for more details.
3.3.2. Light Relay
With oA1 =Lig, the relay operates as light.
3.3.3. Auxiliary Relay (oA1 = AUS)
3.3.3.1. Relay Activation by Digital Input
(oA1 = AUS, i2F = AUS)
With oA1 =AUS and i2F =AUS, the relay 1-7 is
switched ON and OFF by a digital input.
3.3.3.2. Auxiliary Thermostat
An anti-condensing heater with the possibility of
switching it ON and OFF also by keyboard.
The function of the auxiliary relay can be config-
ured by means of the following parameters:
•ACH - Kind of regulation for the auxiliary relay:
Ht: heating; CL: cooling
•SAA - Setpoint for auxiliary relay
•SHy - Differential for auxiliary relay
•ArP - Probe for auxiliary relay
•Sdd - Auxiliary output OFF during defrost
3.3.4. ON/OFF Relay (oA1 = onF)
In this case, the relay is activated when the con-
troller is turned ON and deactivated when the control-
ler is turned OFF.
Figure 3-1 - Compressor Temperature Regulation
NOTE: Set oA1 = AUS and ArP = nP (no probe
for auxiliary output). In this case the relay 1-7
can be activated only by digital input with i1F
or i2F = AUS.

Second Relay Configuration (PAR. oA1; TERM. 1-7) Controlling Loads • 3
3.3.5. Neutral Zone Regulation
With oA1 =db,relay 1-7 can control a heater ele-
ment to perform a neutral zone action.
•oA1 cut in = SEt -Hy
•oA1 cut out = SEt
3.3.6. Alarm Relay
With oA1 =ALr,the relay 1-7 operates as an
alarm relay. It is activated every time an alarm occurs.
Its status depends on the tbA parameter: if
tbA =y, the relay is silenced by pressing any key.
If tbA = n, the alarm relay remains ON until the
alarm condition recovers.
3.3.7. Night Blind Management
During Energy Saving Cycles
With oA1 =HES,the relay 1-7 operates to man-
age the night blind: the relay is energized when the
energy saving cycle is activated, by digital input,
frontal button or RTC (optional).

4 • XR35CX I&O Manual 026-1203 Rev 3 03-FEB-2015
4 Front Panel
Commands
4.1. Keys and Functions
Table 4-1 shows the keys that are found on the
front panel of the XR35CX controller and their corre-
sponding functions:
4.2. Use of LEDS
Each LED function is described in Table 4-2:
Figure 4-1 - XR35CX Front Panel
Key Function
To display the target setpoint; in pro-
gramming mode, it selects a parameter or
confirms an operation.
(DEF key) To start a manual defrost.
(UP arrow key) To see the MAX stored
temperature; in programming mode, it
browses the parameter codes or increases
the displayed value.
(DOWN arrow key) To see the MIN
stored temperature; in programming
mode, it browses the parameter codes or
decreases the displayed value.
Switches the controller OFF, if
onF = oFF.
Switches the light ON and OFF, if
oA1 = Lig.
Key Combinations
Table 4-1 - XR35CX Front Panel Keys and Functions
To lock and unlock the keyboard.
To enter programming mode.
To return to the room temperature dis-
play.
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
ON Energy saving enabled
ON Light ON
ON Auxiliary relay ON
ON Measurement unit
Flashing Programming phase
Table 4-2 - LEDs
Table 4-1 - XR35CX Front Panel Keys and Functions

How to See the MIN Temperature MAX and MIN Temperature Memorization • 5
5MAXandMIN
Temperature
Memorization
5.1. How to See the MIN
Temperature
1. Press and release the DOWN arrow key.
2. The Lo message will be displayed followed by the
minimum temperature recorded.
3. By pressing the DOWN arrow key again or by wait-
ing 5 seconds, the normal display will be restored.
5.2. How to See the MAX
Temperature
1. Press and release the UP arrow key.
2. The Hi message will be displayed followed by the
maximum temperature recorded.
3. By pressing the UP arrow key again or by waiting 5
seconds, the normal display will be restored.
5.3. How to Reset MAX and
MIN Temperature
Recorded
1. Press and hold the SET key for more than 3 seconds
while the maximum or minimum temperature is dis-
played. (rSt message will be displayed)
2. To confirm the operation, the rSt message starts
blinking and the normal temperature will be dis-
played.

6 • XR35CX I&O Manual 026-1203 Rev 3 03-FEB-2015
6 Main Functions
6.1. How to See the
Setpoint
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 seconds to dis-
play the probe value again.
6.2. How to Change the
Setpoint
1. Push the SET key for more than 2 seconds to change
the setpoint value.
2. The value of the setpoint will be displayed and the
°C or °F LED starts blinking.
3. To change the setpoint value, push the UP or
DOWN arrow keys within 10 seconds.
4. To memorize the new setpoint value, push the SET
key again or wait 10 seconds.
6.3. How to Start a Manual
Defrost
Push the DEF key for more than 2
seconds and a manual defrost will
start.
6.4. How to Change a
Parameter Value
To change the parameter’s value operate as fol-
lows:
1. Enter the Programming mode by pressing the SET
+ DOWN arrow keys for 3 seconds (the °C or °F
LED starts blinking).
2. Select the required parameter (refer to Section 7,
Parameters for the list of parameters). Press the
SET key to display its value.
3. Use the UP or DOWN arrow keys to change its val-
ue.
4. Press SET to store the new value and move to the
following parameter.
5. To exit, press SET + UP arrow keys or wait 15 sec-
onds without pressing a key.
6.5. The Hidden Menu
The Hidden Menu includes all the parameters of
the controller.
6.5.1. How to Enter the Hidden
Menu
1. Enter the Programming mode by pressing the SET
+ DOWN arrow keys for 3 seconds (the °C or °F
LED starts blinking).
2. Immediately release the keys, then push the SET +
DOWN arrow keys again for more than 7 seconds.
The Pr2 label will be displayed immediately fol-
lowed by the Hy parameter. NOW YOU ARE IN
THE HIDDEN MENU.
3. Select the required parameter. See Section 7, Pa-
rameters for the list of parameters.
4. Press the SET key to display its value.
5. Use the UP or DOWN arrow keys to change its val-
ue.
6. Press SET to store the new value and move to the
next parameter.
7. Press SET + DOWN arrow keys or wait for 15 sec-
onds without pressing a key to exit.
NOTE: The set value is stored even when the
time-out expires and ends the procedure.
NOTE: If a parameter is not present in Pr1, the
noP message is displayed after 3 seconds. Keep
the keys pressed until the Pr2 message is dis-
played.
NOTE: The set value is stored even when the
time-out expires and ends the procedure.

How to Assign a MODBUS Address Main Functions • 7
6.5.2. How to Move a Parameter
from the Hidden Menu to the
First Level and Vice Versa
Each parameter present in the Hidden Menu can
be removed or put into THE FIRST LEVEL (user lev-
el) by pressing SET + DOWN arrow keys.
In the Hidden Menu, when a parameter is present
in First Level, the decimal point is visible.
6.6. How to Assign a
MODBUS Address
1. Follow Steps 1and 2of Section 6.5.1., How to En-
ter the Hidden Menu to access the Hidden Menu.
2. Select the Adr parameter.
3. Press SET to select.
4. Choose the address number using the arrow keys
and press SET again to save.
5. Press the SET and UP arrow keys to exit.
Note that devices cannot have duplicate addresses
on the network. Assigning MODBUS addresses prior
to terminating the network and leaving the address of
device 1 as unused until the network is connected can
prevent duplicate addressing network issues.
6.7. How to Lock the
Keyboard
1. Keep the UP and the DOWN arrow keys pressed for
more than 3 seconds.
2. The PoF message will be displayed and the key-
board will be locked. At this point it will be possible
to see the setpoint or the MAX or MIN temperature
stored only.
3. If a key is pressed more than 3 seconds, the PoF
message will be displayed.
6.8. To Unlock the
Keyboard
To unlock the keyboard, press the UP and the
DOWN arrow keys for more than 3 seconds until the
Pon message displays.
6.9. The Continuous Cycle
When defrost is not in progress, it can be activated
by pressing the UP arrow key for about 3 seconds.
The compressor operates to maintain the CCS set-
point for the time set through the CCt parameter. The
cycle can be terminated before the end of the set time
by pressing the same activation key (UP arrow key)
for 3 seconds.
6.10.The ON/OFF Function
With onF =oFF, pushing the ON/OFF key
will turn the controller OFF. The OFF mes-
sage is displayed. In this configuration, the
regulation is disabled.
To switch the controller ON, push again the ON/
OFF key.
WARNING! Loads connected to the normally
closed contacts of the relays are always sup-
plied and under voltage, even if the controller
is in stand-by mode.

8 • XR35CX I&O Manual 026-1203 Rev 3 03-FEB-2015
7 Parameters
Code Parameter Function
REGULATION
Hy Differential (0.1 to 25.5°C / 1 to 255°F)
Intervention differential for setpoint. Compressor Cut IN
is Setpoint + differential (Hy). Compressor Cut OUT is
when the temperature reaches the setpoint.
LS Minimum setpoint (-100°C to SEt/-148°F to SEt)
Sets the minimum value for the setpoint.
US Maximum setpoint (SEt to 110°C/ SEt to 230°F)
Sets the maximum value for the setpoint.
ot Thermostat probe calibration (-12.0 to 12.0°C; -120 to 120°F)
Allows to adjust possible offset of the thermostat probe.
P2P Evaporator probe presence n = not present: the defrost stops by time
y = present: the defrost stops by temperature
oE Evaporator probe calibration (-12.0 to 12.0°C; -120 to 120°F)
Allows to adjust possible offset of the evaporator probe.
P3P Third probe presence (P3)n = not present: the terminals 18-20 operate as digital in-
put
y = present: the terminals 18-20 operate as third probe
o3 Third probe calibration (P3) (-12.0 to 12.0°C; -120 to 120°F)
Allows to adjust possible offset of the third probe.
P4P Fourth probe presence (n= not present, y= present)
o4 Fourth probe calibration (-12.0 to 12.0°C)
Allows to adjust possible offset of the fourth probe.
Ods Outputs activation delay at start up (0 to 255 min)
This function is enabled at the initial start up of the con-
troller and inhibits any output activation for the period of
time set in the parameter.
Ac Anti-short cycle delay (0 to 50 min)
Minimum interval between the compressor stop and the
following restart.
rtr Percentage of the second and first probe for
regulation (0 to 100; 100 = P1, 0 = P2)
Allows to set the regulation according to the percentage
of the first and second probe, as for the following formula
(rtr(P1 - P2)/100 +P2).
CCt Compressor ON time during continuous cycle (0.0 to 24.0 hr, res. 10 min)
Allows to set the length of the continuous cycle: com-
pressor stays ON without interruption for the CCt time.
Can be used, for instance, when the room is filled with
new products.
CCS Setpoint for continuous cycle (-100 to 150°C)
Sets the setpoint used during the continuous cycle.
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 Con = 0, compressor is al-
ways OFF.
Table 7-1 - List of Parameters

The ON/OFF Function Parameters • 9
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 CoF = 0, compressor is al-
ways active.
CH Type of action CL = cooling; Ht = heating
DISPLAY
CF Temperature measurement unit °C = Celsius; °F = Fahrenheit
CAUTION!When the measurement unit is changed, the
setpoint and the values of the parameters Hy,LS,US,ot,
ALU,and ALL have to be checked and modified if neces-
sary.
rES Resolution (for °C) (in = 1°C; dE = 0.1°C)
Allows decimal point display.
Lod Controller display (P1, P2, P3, P4, SEt, dtr)
Selects which probe is displayed by the controller:
P1 = Thermostat probe
P2 = Evaporator probe
P3 = Third probe (only for model with this option en-
abled)
P4 = Fourth probe
SEt = setpoint
dtr = percentage of visualization
Red X- REP display (optional) (P1, P2, P3, P4, SEt, dtr)
Selects which probe is displayed by X-REP:
P1 = Thermostat probe
P2 = Evaporator probe
P3 = Third probe (only for model with this option en-
abled)
P4 = Fourth probe
SEt = setpoint
dtr = percentage of visualization
dLy Display delay (0 to 20.0 min, res. 10 sec)
When the temperature increases, the display is updated of
1°C/1°F after this time.
dtr Percentage of the second and first probe for
visualization when Lod =dtr (0 to 100; 100 =
P1, 0 = P2)
if Lod =dtr:
Allows to set the visualization according to the percent-
age of the first and second probe, as for the following for-
mula (dtr(P1 - P2)/100 + P2).
DEFROST
tdF Defrost type EL = electric heater; in = hot gas
dFP Probe selection for defrost termination nP = no probe
P1 = thermostat probe
P2 = evaporator probe
P3 = configurable probe
P4 = probe on Hot Key plug
dtE Defrost termination temperature (-50 to 50°C/ -58 to 122°F) (Enabled only when EdF =
Pb)
Sets the temperature measured by the evaporator probe,
which causes the end of defrost.
IdF Interval between defrost cycles (0 to 120 hr)
Determines the time interval between the beginning of
two defrost cycles.
Code Parameter Function
Table 7-1 - List of Parameters

10 • XR35CX I&O Manual 026-1203 Rev 3 03-FEB-2015
MdF Maximum duration for 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 duration for defrost.
dSd Start defrost delay (0 to 99 min)
This is useful when different defrost start times are nec-
essary to avoid overloading the plant.
dFd Temperature displayed during defrost (rt = real temperature; it = temperature at defrost start;
SEt = setpoint; 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 tem-
perature and the restoring of the controller’s normal op-
eration. This time allows the evaporator to eliminate
water drops that might have formed due to defrost.
dPo First defrost after start-up (y= immediate; n= after the IdF time)
dAF Defrost delay after continuous cycle (0 to 23.5 hr)
Time interval between the end of the fast freezing cycle
and the following defrost related to it.
AUXILIARY THERMOSTAT CONFIGURATION (terms. 1-7) - oA1 =AUS
ACH Kind of regulation for auxiliary relay Ht = heating; CL = cooling
SAA Setpoint for auxiliary relay (-100 to 110.0°C; -148 to 230°F)
Defines the room temperature setpoint to switch auxiliary
relay.
SHy Differential for auxiliary output (0.1 to 25.5°C / 1 to 255°F)
Intervention differential for auxiliary output setpoint.
With ACH =CL, AUX Cut in is SAA + SHy; AUX Cut
out is SAA.
With ACH =Ht, AUX Cut in is SAA - SHy; AUX Cut
out is SAA.
ArP Probe selection for auxiliary nP = no probe, the auxiliary relay is switched only by the
digital input
P1 =Probe 1 (thermostat probe)
P2 =Probe 2 (evaporator probe)
P3 =Probe 3 (display probe)
P4 =Probe 4
Sdd Auxiliary relay OFF during defrost n =the auxiliary relay operates during defrost; y =the
auxiliary relay is switched OFF during defrost
ALARMS
ALP Probe selection for alarm nP = no probe, the temperature alarms are disabled
P1 =Probe 1 (Thermostat probe)
P2 =Probe 2 (evaporator probe)
P3 =Probe 3 (display probe)
P4 =Fourth probe
Code Parameter Function
Table 7-1 - List of Parameters

The ON/OFF Function Parameters • 11
ALC Temperature alarms configuration (Ab; rE)
Ab = Absolute temperature: alarm temperature is given
by the ALL or ALU values; rE = Temperature alarms are
referred to the setpoint. Temperature alarm is enabled
when the temperature exceeds the SEt + ALU or SEt-
ALL values.
ALU MAXIMUM temperature alarm (ALL to 110°C; ALL to 230°F)
When this temperature is reached, the alarm is enabled
after the ALd delay time.
ALL Minimum temperature alarm (-100°C to ALU; -148 to ALU)
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 condi-
tion and alarm signaling.
dAo Exclusion of temperature alarm at start-up (from 0.0 min to 23.5 hr)
Time interval between the detection of the temperature
alarm condition after controller power ON and alarm sig-
naling.
CONDENSER TEMPERATURE ALARM
AP2 Probe selection for temperature alarm of con-
denser
nP = no probe
P1 = thermostat probe
P2 =evaporator probe
P3 = configurable probe
P4 = probe on Hot Key plug
AL2 Low temperature alarm of condenser (-100 to 150°C; -148 to 302°F)
When this temperature is reached the LA2 alarm is sig-
naled, possibly after the Ad2 delay.
AU2 High temperature alarm of condenser (-100 to 150°C; -148 to 302°F)
When this temperature is reached the HA2 alarm is sig-
naled, possibly after the Ad2 delay.
AH2 Differential for temperature condenser alarm
recovery
(0.1 to 25.5°C; 1 to 45°F)
Ad2 Condenser temperature alarm delay (0 to 255 min)
Time interval between the detection of the condenser
alarm condition and alarm signaling.
dA2 Condenser temperature alarm exclusion at
start up
(from 0.0 min to 23.5 hr, res. 10 min)
bLL Compressor OFF with low temperature alarm
of condenser
n =no: compressor keeps on working
Y =yes: compressor is switched OFF until the alarm is
present, in any case regulation restarts after Ac time at
minimum
AC2 Compressor OFF with high temperature alarm
of condenser
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
AUXILIARY RELAY
Code Parameter Function
Table 7-1 - List of Parameters

12 • XR35CX I&O Manual 026-1203 Rev 3 03-FEB-2015
tbA Alarm relay silencing (with oA1 = ALr)n = silencing disabled: alarm relay stays ON until alarm
condition lasts
y= silencing enabled: alarm relay is switched OFF by
pressing a key during an alarm
oA1 Second relay configuration (1-7) dEF =defrost; FAn: do not select it!; ALr: alarm; Lig:
light; AUS: Auxiliary relay; onF: always ON with con-
troller ON; db =neutral zone; cP2 =do not select it!;
dEF2: do not select it!; HES: night blind
AOP Alarm relay polarity Set if the alarm relay is open or closed when an alarm
happens.
CL = terminals 1-7 closed during an alarm
oP = terminals 1-7 open during an alarm
DIGITAL INPUTS
i1P Digital input polarity (18-20) oP = the digital input is activated by opening the contact
CL = the digital input is activated by closing the contact
i1F Digital input configuration (18-20) dor = door switch function
dEF = activation of a defrost cycle
i2P 2nd digital input polarity (18-19) oP = the digital input is activated by opening the contact
CL = the digital input is activated by closing the contact
i2F 2nd digital input configuration
(18-19)
EAL = external alarm: EA message is displayed; bAL =
serious alarm; CA message is displayed; PAL = pressure
switch alarm, CA message is displayed; dor = door
switch function; dEF = activation of a defrost cycle; ES
= energy saving; AUS = auxiliary relay activation with
oA1 =AUS; Htr = kind of action inversion (cooling –
heating); FAn = fan; HdF = Holiday defrost (enable only
with RTC); onF =to switch the controller OFF
did With i2F =EAL or i2F =bAL: digital input
alarm delay (18-20)
(0 to 255 min)
Delay between the detection of the external alarm condi-
tion and its signaling.
With i2F = PAL: time for pressure switch
function
(0 to 255 min)
Time interval to calculate the number of the pressure
switch activation.
doA Door open signaling delay (0 to 255 min)
nPS Pressure switch number (0 to 15)
Number of activation of the pressure switch, during the
did interval, before signaling the alarm event (i2F=
PAL). If the nPS activation in the did time is reached,
switch OFF and ON the controller to restart normal regu-
lation.
Odc Compressor status when open door no;FAn = normal; CPr,F_C = Compressor OFF
rrd Outputs restart after doA alarm no =outputs not affected by the doA alarm
yES =outputs restart with the doA alarm
HES Temperature increase during the Energy Sav-
ing cycle
(-30.0°C to 30.0°C)
Sets the increasing value of the setpoint during the Ener-
gy Saving cycle.
TO SET CURRENT TIME AND WEEKLY HOLIDAYS (ONLY FOR MODELS WITH RTC)
Hur Current hour (0 to 23 hr) Sets the current hour.
Min Current minute (0 to 59 min) Sets the current minute.
dAY Current day (Sun to SAt) Sets the current day of the week.
Code Parameter Function
Table 7-1 - List of Parameters

The ON/OFF Function Parameters • 13
Hd1 First weekly holiday (Sun to not used) Sets the first day of the week which follows the holiday
times.
NOTE: Hd1 can be set also as not used value.
Hd2 Second weekly holiday (Sun to not used) Sets the second day of the week which follows the holi-
day times.
NOTE: Hd2 can be set also as not used value.
TO SET ENERGY SAVING TIMES (ONLY FOR MODELS WITH RTC)
iLE Energy Saving cycle start during workdays (0 to 23 hr 50 min)
During the Energy Saving cycle, the setpoint is increased
by the value in HES so that the operation setpoint is SEt
+ HES.
dLE Energy Saving cycle length during workdays (0 to 24 hr 00 min)
Sets the duration of the Energy Saving cycle on work-
days.
iSE Energy Saving cycle start on holidays. (0 to 23
hr 50 min)
dSE Energy Saving cycle length on holidays (0 to
24 hr 00 min)
TO SET DEFROST TIMES (ONLY FOR MODELS WITH RTC)
Ld1 to
Ld6
Workday defrost start (0 to 23 hr 50 min) These parameters set the beginning of the 6 programma-
ble defrost cycles during workdays. (e.g., When Ld2 =
12.4 the second defrost starts at 12:40 during workdays.)
Sd1 to
Sd6
Holiday defrost start (0 to 23 hr 50 min) These parameters set the beginning of the 6 programma-
ble defrost cycles on holidays. (e.g., When Sd2 =3.4 the
second defrost starts at 3:40 on holidays.)
NOTE: To disable a defrost cycle, set it to not used. (e.g., If Ld6 = not used, the sixth defrost cycle is disabled.)
OTHER PARAMETERS
Adr Serial address (1 to 244) Identifies the controller address when connected to a
MODBUS compatible monitoring system.
pbC Type of probe Allows to set the kind of probe used by the controller:
Pt1 = Pt1000 probe
ntc = NTC probe
CtC = Standard CPC temp sensor
Set this pbC parameter to CtC to support standard CPC
temp sensors - factory default.
onF ON/OFF key enabling not used = disabled
oFF = enabled
ES = not set it
dP1 Thermostat probe display
dP2 Evaporator probe display
dP3 Third probe display (optional)
dP4 Fourth probe display
rSE Real setpoint Shows the setpoint used during the energy saving cycle
or during the continuous cycle.
rEL Software release For internal use only.
Ptb Parameter table code Read only
Code Parameter Function
Table 7-1 - List of Parameters

14 • XR35CX I&O Manual 026-1203 Rev 3 03-FEB-2015
8 Digital Inputs
The first digital input 18-20 is enabled with P3P =
n. With P3P =n and i1F =i2F, the second digital in-
put is disabled. The free voltage digital inputs are pro-
grammable by the i1F and i2F parameters.
8.1. Generic Alarm
(i2F=EAL)
As soon as the digital input is activated, the unit
will wait for the did time delay before signaling the
EAL alarm message. The outputs status do not
change. The alarm stops just after the digital input is
deactivated.
8.2. Serious Alarm Mode
(i2F=bAL)
When the digital input is activated, the unit will
wait for the did delay before signaling the CA alarm
message. The relay outputs are switched OFF. The
alarm will stop as soon as the digital input is deacti-
vated.
8.3. Pressure Switch
(i2F=PAL)
If the pressure switch has reached the number of
activations (cycles) of the nPS parameter during the
interval time set by the did parameter, the CA pres-
sure alarm message will be displayed. The compres-
sor 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 the con-
troller OFF and ON to restart normal regulation.
8.4. Door Switch Input (i1F
or i2F=dor)
This input signals the door status and the corre-
sponding relay output status through the Odc param-
eter: no, Fan = normal (any change); CPr; F_C=
Compressor OFF.
Since the door is opened, after the delay time set
through the 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 dis-
abled.
8.5. Start Defrost (i1F or
i2F=dEF)
If conditions are favorable for defrost, a defrost
will be started. After the defrost is finished, the nor-
mal regulation will restart only if the digital input is
disabled, otherwise the controller will wait until the
MdF safety time is expired.
8.6. Switch the Auxiliary
Relay (i2F=AUS)
With oA1 =AUS, the digital input switches the
status of the auxiliary relay.
8.7. Inversion of the Kind of
Action: Heating-
Cooling (i2F=Htr)
This function enables the controller to invert the
regulation of the controller: from cooling to heating
and vice versa.
8.8. Energy Saving (i2F=ES)
The Energy Saving function allows you to change
the setpoint value as the result of the SEt + HES (pa-
rameter) sum. This function is enabled until the digi-
tal input is activated.
8.9. Holiday Defrost
(i2F=HdF) - Only for
Models with RTC
This function enables the holiday defrost setting.