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Auxiliary probe calibration: (-12.0

12.0°C/ -21

21°F) allows to adjust possible offsets of the

evaporator probe.

P2P Evaporator probe presence:

n= not present: the defrost stops only by time; y= present: the defrost stops by temperature and time.

P3P Auxiliary probe presence: n= not present; y= present.
HES Temperature increase during the Energy Saving cycle : (-30,0°C

30,0°C / -22÷86°F) sets the

increasing value of the set point during the Energy Saving cycle.

DIGITAL INPUTS

odc Compressor and fan status when open door:

no = normal;
Fan = Fan OFF;
CPr = Compressor OFF;
F_C = Compressor and fan OFF.

I1P

Door switch input polarity:
CL : the digital input is activated by closing the contact;
OP : the digital input is activated by opening the contact.

I2P

Configurable digital input polarity:
CL : the digital input is activated by closing the contact;
OP : the digital input is activated by opening the contact

I2F

Digital input operating mode: configure the digital input function:
EAL = generic alarm;
bAL = serious alarm mode;
PAL = Pressure switch;

dFr = Start defrost;
AUS = Relay AUX actuation;
Es = Energy Saving;
onF = remote On/OFF.

did Time interval/delay for digital input alarm:(0

255 min.) Time interval to calculate the number of the

pressure switch activation when I2F=PAL. If I2F=EAL or bAL (external alarms), “did” parameter defines
the time delay between the detection and the successive signalling of the alarm.

SAA Set Point for anti-condensing heater: (-50,0÷110,0°C; -58÷230°F) defines the room temperature

setpoint to switch on the anti-condensing heater.

OTHER

Adr RS485 serial address (1÷247): Identifies the instrument address when connected to a ModBUS

compatible monitoring system.

Rel Release

software: (read only) Software version of the microprocessor.

Ptb Parameter

table: (read only) it shows the original code of the

parameter map.

Prd Probes display: (read only) display the temperature values of the evaporator probe Pb2 and the

auxiliary probe Pb3.

Pr2 Access to the protected parameter list (read only).

DIGITAL INPUTS

The Wing series can support up to 2 free contact digital inputs. One is always configured as door switch, the
second is programmable in seven different configurations by the “I2F” parameter.

DOOR SWITCH INPUT

It signals the door status and the corresponding relay output status through the “odc” parameter:

no = normal (any change);
Fan = Fan OFF;
CPr = Compressor OFF;
F_C = Compressor and fan OFF.

Since the door is opened, after the delay time set through parameter “dOA”, the alarm output is enabled and
the display shows the message “dA”. The alarm stops as soon as the external digital input is disabled again.
During this time and then for the delay “dot” after closing the door, the high and low temperature alarms are
disabled.

CONFIGURABLE INPUT - GENERIC ALARM (EAL)

As soon as the digital input is activated the unit will wait for “did” time delay before signalling the “EAL” alarm
message. The outputs status don’t change. The alarm stops just after the digital input is de-activated.

CONFIGURABLE INPUT - SERIOUS ALARM MODE (BAL)

When the digital input is activated, the unit will wait for “did” delay before signalling the “BAL” alarm message.
The relay outputs are switched OFF. The alarm will stop as soon as the digital input is de-activated.

CONFIGURABLE INPUT - PRESSURE SWITCH (PAL)

If during the interval time set by “did” parameter, the pressure switch has reached the number of activation of
the “nPS” parameter, the “PAL” pressure alarm message will be displayed. The compressor and the regulation
are stopped. When the digital input is ON the compressor is always OFF.

CONFIGURABLE INPUT - START DEFROST (DFR)

It executes a defrost if there are the right conditions. After the defrost is finished, the normal regulation will
restart only if the digital input is disabled otherwise the instrument will wait until the “Mdf” safety time is expired.

CONFIGURABLE INPUT - RELAY AUX ACTUATION (AUS)

This function allows to turn ON and OFF the auxiliary relay by using the digital input as external switch.

CONFIGURABLE INPUT - ENERGY SAVING (ES)

The Energy Saving function allows to change the set point value as the result of the SET+ HES (parameter)
sum. This function is enabled until the digital input is activated.

CONFIGURABLE INPUT - REMOTE ON/OFF (ONF)

This function allows to switch ON and OFF the instrument.

DIGITAL INPUTS POLARITY

The digital inputs polarity depends on “I1P” and “I2P” parameters.

CL : the digital input is activated by closing the contact.
OP : the digital input is activated by opening the contact

INSTALLATION AND MOUNTING

Instruments XW270L, XW271L shall be mounted on vertical panel, in a 150x31 mm hole, and fixed using two
screws

∅

3 x 2mm. To obtain an IP65 protection grade use the front panel rubber gasket (mod. RG-L). The

temperature range allowed for correct operation is 0 - 60 °C. Avoid places subject to strong vibrations,
corrosive gases, excessive dirt or humidity. The same recommendations apply to probes. Let the air circulate
by the cooling holes.

CUT OUT

165

150

+ 0.5

-0

+ 1
-1

Ø3 x2

MOUNTING WITH KEYBOARD COVER OPENING DOWNWARD

C LIC K!

MOUNTING WITH KEYBOARD COVER OPENING UPWARD

C LIC K!

ELECTRICAL CONNECTIONS

The instruments are provided with screw terminal block to connect cables with a cross section up to 2,5 mm

for

the digital and analogue inputs. Relays and power supply have a Faston connection (6,3mm). Heat-resistant
cables have to be used. Before connecting cables make sure the power supply complies with the instrument’s
requirements. Separate the probe cables from the power supply cables, from the outputs and the power
connections. Do not exceed the maximum current allowed on each relay, in case of heavier loads use a
suitable external relay.
N.B. Maximum current allowed for all the loads is 20A.

PROBE CONNECTIONS

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.

TTL SERIAL LINE

The TTL connector allows, by means of the external module TTL/RS485, to connect the unit to a network line
ModBUS-RTU compatible as the

monitoring system XJ500 (Version 3.0).

The same TTL connector is used to upload and download the parameter list of the “HOT KEY“.