dixell XH460L Operating Instructions Manual

Dixell

Operating instructions

1592002910

1592002910 XH460L GB R1.0 18.05.04 XH460L 1/5

XH460L

TEMPERATURE AND HUMI DITY CONTROLLER

FOR FREEZING – PROVING CABINETS

1. GENERAL WARNING

1.1 PLEASE READ BEFORE USING THIS MANUAL

This manual is part of the product and should be kept near the instrument for easy and quick

reference.

The instrument shall not be used for purposes different from those described hereunder. It cannot

be used as a safety device.

Check the application limits before proceeding.

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 XH460L, 38x185 format, is a microprocessor controller, designed for freezing and proving cabinets­units. It controls both humidity and temperature. It has 6 output relays to control compressor, heating
elements, defrost, fan de-humidifier and humidifier. It has 2 NTC inputs one for thermostat the other one
for defrost. It’s also present a 4÷20mA input for humidity. There is one digital input (free contact)
configurable by parameter. An output allows the user to programme the parameter list with the “Hot
Key”.

3. TEMPERATURE REGULATION

The temperature regulation is performed through neutral zone using compressor and heater output
relays.

Set point

OFF

ON

• Heating output: CUT IN is “SET_T-dbt”, CUT OUT is when the temperature reaches the set point.

• Compressor output CUT IN is “ SET_T +dbt”, CUT OUT is when the temperature reaches the set point.

3.1 DEFROST

Two defrost modes are available through the “tdF” parameter: defrost with electrical heater or hot gas.
The defrost interval is control by means of parameter “EdF”: (EdF=in) the defrost is made every “IdF”

time, (EdF=Sd) the interval “IdF” is calculate through Smart Defrost algorithm (only when the compressor
is ON).
To disable the defrost set the MdF parameter to zero

Humidity regulation during a defrost depends on the Hud parameter.
With Hud=no humidity regulation is disabled.
Con Hud=yES humidity regulation is performed also during a defrost.

4. HUMIDITY REGULATION

The humidity regulation is performed through neutral zone, by humidifying dehumidifying actions.

Humidity control can be disabled setting the SET_RH to “nu” value. In this case only the temperature

control is perform.

4.1 HUMIDIFYING ACTION

The humidifying action is done enabling the humidifier relay when the humidity is lower than the
“SET_RH-dbH” value.
The relay is switch off when humidity reaches the set values.

4.2 DEHUMIDIFYING ACTION WITHOUT DEHUMIDIFIER RELAY (OA1 DIFFERENT FROM DEH) ­STANDARD

In this case the dehumidifying action is performed by setting the following parameters in this way:

tHu = c-H kind of dehumidifying by means of heating and compressor relays
oA1 different from dEH:

The heating and compressor outputs are activated together when humidity is higher than SET_RH+dbH
value. Outputs are disabled when humidity comes back to the SET_RH value.

4.2.1 Relation between cooling, heating and dehumidifying

1. If is simultaneously present a request of cooling (temp>SET_T+dbt) and dehumidifying (RH >

SET_RH+dbH): the cooling action has the priority over the dehumidifying action: only the
compressor relay is energised till the SET_T is reached at this point al so the heating relay is
enabled.

2. If is simultaneously present a request of heating (temp< SET_T-dbt) and dehumidifying (RH >

SET_RH+dbH): the dehumidifying action has the priority over the heating action: both the
compressor and the heating relays are energised till the humidity set is reached at this point only
the heating relay is enabled.

4.3 DEHUMIDIFYING ACTION WITH DEHUMIDIFIER RELAY (OA1 = DEH)
The configurable relay is used, (XH460L terminals 3-4) setting the parameter oA1 =dEH.

NOTE: the LIGHT button is not more available;

Two kinds of de-humidifying are available:

4.3.1 Dehumidifying action with ONLY de-humidifier relay

By setting the parameter tHu = db the de-humidifying action is performed by enabling the de-humidifier
relay when the humidity is higher than SET_RH + dbH.
The relay is switch off when humidity comes back to the SET_RH value.

4.3.2 Dehumidifying action with de-humidifier and compressor relays

By setting the parameter tHu = cHu the de-humidifying action is performed by enabling the de-humidifier
and compressor relays together. when the humidity is higher than SET_RH + dbH.
The relays are switched off when humidity comes back to the SET_RH value.

If is simultaneously present a request of cooling (temp>SET_T+dbt) and dehumidifying (RH >
SET_RH+dbH): the cooling action has the priority over the dehumidifying action: only the compressor
relay is energised till the SET_T is reached at this point also the de-humidifier is enabled.

5. FA NS

The fan control mode is selected by means of the “FnC” parameter:
FnC=C-n fans will switch ON and OFF with the compressor and not run during defrost:;
FnC= O-n fans will run continuously, but not during defrost
FnC=C-y fans will switch ON and OFF with the compressor and run during defrost;
FnC=O-y fans will run continuously also during defrost

6. FREZING –PROVING CYCLE

FREEZING PROVING HOLDING

(optional)

The diagrams displays a typical freezing and proving cycle with the holding phase.

FREEZING PHASE lasts for the T1 time, usually without humidity control
PROVING PHASE lasts for the T2 time, both temperature and humidity are controlled.

The end of the proving phase is signalled by the internal buzzer and by the “End” message on the

display.
After the PROVING PHASE the behaviour of the controller depends on the parameter trc, according to
the following settings:

trc = co controller maintains the set points of the proving phase (HOLDING)
trc = in controller stop the regulation at all.
trc = cL controller performs the freezing and proving phase till is stopped manually.
trc = cLE as (trc = cL) plus at the end of each cycle the End label is displayed and the buzzer

is switched on.

6.1 HOW TO SET THE DURATION OF THE FREEZING AND PROVING CYCLE

1. Push the CLOCK key, the display shows on the bottom display the “tM1” message, while the

“hourglass” start flashing.

2. Push again the CLOCK the duration of the freezing phase is shown, hh:mm.

3. To set the duration push the UP and DOWN keys.

4. Push again the CLOCK to confirm the time and pass to the setting of the proving phase: the “tM2”

message is displayed.

5. Push the CLOCK key to see its duration and use the UP and DOWN keys to set it.

6. Confirm the value by pushing again the CLOCK key and pass to the humidity display.

NOTE: If the phase length is modified during a cycle, the modification is performed also in the next cycle.

6.2 HOW TO SET THE TARGET HUMIDITY OF THE FREEZING AND PROVING CYCLE

1. Push the SET_RH key, the display shows on the bottom display the “SH1” message, while the “set

” icon starts flashing.

2. Push again the SET_RH the humidity set point of the freezing phase is shown. Set it using the UP

and DOWN keys. To disable the humidity control during the freezing phase set it to “nu”.

3. Push again the SET_RH to confirm the value and pass to the setting of the proving phase: the

“SH2” message is displayed.

4. Push the SET_RH key to see its value and use the UP and DOWN keys to set it.

Dixell

Operating instructions

1592002910

1592002910 XH460L GB R1.0 18.05.04 XH460L 2/5

6.3 HOW TO SET THE TARGET TEMPERATURE OF THE FREEZING AND PROVING CYCLE

1. Push the SET_T key, the display shows on the upper display the “St1” message, while the “set ”

icon starts flashing.

2. Push again the SET_T the temperature set point of the freezing phase is shown. Set it using the UP

and DOWN keys.

3. Push again the SET_T to confirm the value and pass to the setting of the proving phase: the “St2”

message is displayed.

4. Push the SET_T key to see its value and use the UP and DOWN keys to set it.

6.4 HOW TO START THE CYCLE

Push and release START key: the led will be turned ON.

The led flashes during the proving phase

6.5 END OF THE CYCLE
When the timer has expired, the buzzer starts sounding and the bottom display shows the “End”

message.
To mute the buzzer push a key: The display come back to show the humidity and the LED of the START
key is turned off.

6.6 HOW TO MODIFY THE SETTING OF THE RUNNING CYCLE.

To modify the setting of the running cycle temperature (SET_T), humidity (SET_RH) or remaining time
(CLOCK):

1. Push twice the corespondent key: the setting value of the current phase (freezing or proving) will be

displayed.

2. Modify it using the UP and DOWN keys

3. Confirm the value using the corespondent key: temperature (SET_T), humidity (SET_RH) or

remaining time (CLOCK).

7. THE DISPLAY

To display and modify target temperature set point. (SET_T) for the freezing (St1)and the
proving (St2) phase.

To display and modify target humidity set point (SET_RH) or the freezing (SH1)and the
proving (SH2) phase; in programming mode it selects a parameter or confirm an operation.

In programming mode it browses the parameter codes or increases the displayed value.

To start a manual defrost: hold it pressed for at least 3s.
In programming mode it browses the parameter codes or decreases the displayed value.

Switch ON and OFF the light, if present (oA1=lig)

Start: to start the cycle

Clock: to set the duration of the freezing (tM1) and proving (tM2) phase

Switch ON and OFF the instrument.

KEY COMBINATIONS

+

To lock and unlock the keyboard

+

To enter the programming mode.

+

To exit the programming mode.

7.1 ICONS AND SYMBOLS

Each LED function is described in the following table.

LED2 LED3

LED4

Temperature Display

Humidity Display

LED

MODE

FUNCTION

LED

MODE

FUNCTION

Led 4

ON

- Instrument in stand by.

- In “Pr2” indicates that the parameter is also present in “Pr1”.

ON

°C

°F

ON

°C

ON

The compressor is running

FLASHING

- Anti-short cycle delay enabled

LED 3

ON

The defrost is enabled

LED 3

FLASHING

Drip time in progress

LED 2

FLASHING

Programming Phase (flashing with LED3)

ON

Heating enabled

(temp)

FLASHING

Temperature Set programming phase

ON

- ALARM signal

ON

Fan is running

ON

RH%

ON

Dehumidifying enabled

ON

Humidifying enabled

(umid)

FLASHING

Humidity Set programming phase

ON

Freezing phase is in progress

FLASHING

Proving phase is in progress

FLASHING

Setting of the duration of the cycle

7.2 HOW TO SEE AND MODIFY THE SET POINT (TEMPERATURE AND HUMIDITY)

1. Push and immediately release the SET key: the display will show the Set point

valueand the correspondant set icon starts flashing;

2. To change the Set value push the o or n arrows within 10s.

3. To memorise the new set point value push the SET key again or wait 10s.

7.3 TO START A MANUAL DEFROST

1. Push the DEF key for more than 2 seconds and a manual defrost will start.

7.4 TO ENTER IN PARAMETERS LIST “PR1”

To enter the parameter list “Pr1” (user accessible parameters) operate as follows:

+

1. Enter the Programming mode by pressing the SET_RH+ n for few

seconds. (LED2&3 start flashing)

2. The instrument will show the first parameter present in “Pr1”

7.5 TO ENTER IN PARAMETERS LIST “PR2”

To access parameters in “Pr2”:

1. Enter the “Pr1” level.

2. Select “Pr2” parameter and press the “ SET_RH ” key.

3. The “PAS” flashing message is displayed, shortly followed by “0 - -” with a flashing zero.

4. Use o or n to input the security code in the flashing digit; confirm the figure by pressing “

SET_RH ”.

The security code is “321“.

5. If the security code is correct the access to “Pr2” is enabled by pressing “ SET_RH ” on the last

digit.

Another possibility is the following: after switching ON the instrument the user can push SET_RH + n
keys within 30 seconds.

NOTE: each parameter in “Pr2” can be removed or put into “Pr1” (user level) by pressing SET_RH + n .
When a parameter is present in “Pr1” LED 4 is on.

7.6 TO CHANGE PARAMETER VALUES

1. Enter the Programming mode.

2. Select the required parameter with o or n.

3. Press the “ SET_RH ” key to display its value (LED2&3 start blinking).

4. Use o or n to change its value.

5. Press “ SET_RH ” to store the new value and move to the following parameter.

To exit: Press SET_RH + UP or wait 15s without pressing a key.
NOTE: the new programming is stored even when the procedure is exited by waiting the time-out.

7.7 HOW TO LOCK THE KEYBOARD

1. Keep the o and n keys pressed together for more than 3 s the o and n keys.

2. The “POF” message will be displayed and the keyboard is locked. At this point it is

only possible the viewing of the set point or the MAX o Min temperature stored and
to switch ON and OFF the light, the auxiliary output and the instrument.

TO UNLOCK THE KEYBOARD

Keep the o and n keys pressed together for more than 3s.

Dixell

Operating instructions

1592002910

1592002910 XH460L GB R1.0 18.05.04 XH460L 3/5

7.8 ON/OFF FUNCTION

By pushing the ON/OFF key, the instrument shows “OFF” for 5 sec. and the ON/OFF LED
is switched ON.
During the OFF status, all the relays are switched OFF and the regulations are stopped;

N.B. During the OFF status the LED4 button is lighted.

8. PARAMETER LIST

REGULATION

dbt half dead band width for temperature: (0,1÷25,5°C; 1÷45°F) this band is place below and above

the temperature set point (SET_T). The compressor is enabled when the temperature increases
and reaches the SET_T + dbt value. It is turned off when it comes back to the SET_T. The heating
output is enabled when temperature is less than SET_T -dbt value and disabled when the SET_T is
reached.

dbH half dead band width for humidity: (0,5÷25,5RH) this band is place below and above the

humidity set point (SET_RH). The dehumidifying action is enabled when the humidity increases and
reaches the SET_RH + dbH value. It is stopped when it comes back to the SET_RH. The
humidifying output is enabled when humidity is less than SET_RH -dbH value and disabled when
the SET_RH is reached.

LS Minimum temperature set point limit: (-50,0°C SET; -58°F÷SET) Sets the minimum acceptable

value for the set point.

US Maximum temperature set point limit: (SET 110°C; SET÷230°F) Set the maximum acceptable

value for set point.

OdS Outputs activation delay at start up: (0÷255 min) This function is enabled at the initial start up of

the instrument and inhibits any output activation for the period of time set in the parameter. (Light
can work)

AC Anti-short cycle delay: (0÷30 min) interval between the compressor stop and the following restart.
tHu Kind of de-humidifying: db: only with de-humidifier relay (oA1= dEH)

cHu with de-humidifier and compressor relay (oA1= dEH)
c-H: without de-humidifier relay, by means of compressor and heating relays (oA1 dEH).

LSH Minimum humidity set point limit: (Lci ÷ Set H) Sets the minimum acceptable value for the

humidity set point.

USH Maximum humidity set point limit: (Set H ÷ uci) Set the maximum acceptable value for

humidity set point.

DISPLAY AND KIND OF REGULATION
CF Measurement unit: °C= Celsius; °F= Fahrenheit

rES Resolution (for °C): allows decimal point display. dE = 0,1°C; in = 1 °C
rEH Resolution for RH%: in = integer; Hd= half digit.
trC Kind of behaviour after the end of the cycle
trC=co the controller goes on working, and maintains the temperature and humidity of the proving

phase, till the controller is stopped.

trC=in at the end of the proving phase the controller gives the “End” message, the buzzer is turned

on, and the regulation is stopped.

trC=cL at the end of the proving phase the controller gives the “End” message, the buzzer is turned

on, and the regulation restarts from the freezing phase

trC=cLE at the end of the proving phase the regulation restarts from the freezing phase.

DEFROST
tdF Defrost type: rE = electrical heater (Compressor OFF)

in = hot gas (Compressor and defrost relays ON)

EdF Defrost mode: in = interval mode. The defrost starts when the time “Idf” is expired.

Sd = Smartfrost mode. The time IdF (interval between defrosts) is increased only when the

compressor is running (even non consecutively).

SdF Set point for SMARTFROST: (-30 30 °C/ -22 86 °F) evaporator temperature which allows the IdF

counting (interval between defrosts) in SMARTFROST mode.

dtE Defrost termination temperature: (-50,0÷110,0°C; -58÷230°F) (Enabled only when the

evaporator probe is present) sets the temperature measured by the evaporator probe which causes
the end of defrost.

IdF Interval between defrosts: (1÷120h) Determines the time interval between the beginning of two

defrost cycles.

MdF Duration of defrost: (0÷255 min) When P2P = n, no evaporator probe, it sets the defrost duration,

when P2P = y, defrost end based on temperature, it sets the maximum length for defrost.

dFd Display during defrost:
rt = real temperature; it = temperature reading at the defrost start;

Set = set point; dEF = “dEF” label; dEG = “dEG” label;

dAd Defrost display time out: (0 255 min) Sets the maximum time between the end of defrost and the

restarting of the real room temperature display.

Fdt Drain down time: (0÷60 min.) time interval between reaching defrost termination temperature and

the restoring of the control’s normal operation. This time allows the evaporator to eliminate water

drops that might have formed due to defrost.
dPO First defrost after start-up: y = Immediately; n = after the IdF time
Hud Humidity control during defrost: no: the humidity control is stopped during the defrost; yES the

humidity control works also during the defrost.

FANS
FnC Fan operating mode: C-n = running when a load is on, OFF during the defrost;

C-y = running when a load is on, ON during the defrost;

O-n = continuous mode, OFF during the defrost; O-y = continuous mode, ON during the defrost;
TEMPERATURE ALARMS
ALC Temperature alarm configuration: rE = High and Low alarms related to Set Point

Ab = High and low alarms related to the absolute temperature.
ALL Low temperature alarm setting: ALC = rE , 0 50 °C or 90°F

ALC = Ab , - 50°C or -58°F ALU
when this temperature is reached and after the ALd delay time, the LA alarm is enabled,.
ALU High temperature alarm setting: ALC= rE, 0 50°C or 90°F
ALC= Ab, ALL 110°C or 230°F
when this temperature is reached and after the ALd delay time the HA alarm is enabled.

ALH Temperature alarm recovery differential: (0,1÷25,5°C; 1÷45°F) Intervention differential for

recovery of temperature alarm.

ALd Temperature alarm delay: (0÷255 min) time interval between the detection of an alarm condition

and the corresponding alarm signalling.

dAO Delay of temperature alarm at start-up: (0min÷23h 50min) time interval between the detection of

the temperature alarm condition after the instrument power on and the alarm signalling.

EdA Alarm delay at the end of defrost: (0 255 min) Time interval between the detection of the

temperature alarm condition at the end of defrost and the alarm signalling.

dot Delay of temperature alarm after closing the door : (0 255 min) Time delay to signal the

temperature alarm condition after closing the door.

HUMIDITY ALARMS
AHC Humidity alarm configuration: rE = High and Low alarms related to humidity Set Point

Ab = High and low alarms related to the “absolute” humidity.

AHL Low humidity alarm setting: (with AHC = rE: 0 ÷ 50. With AHC = Ab: Lci ÷ AHu)

when this humidity is reached and after the AHd delay time, the HLA alarm is enabled,.
AHu High humidity alarm setting: (with AHC = rE: 0÷50°C. with AHC = Ab: AHL ÷ uci
when this humidity is reached and after the AHd delay time the HHA alarm is enabled.
AHH Humidity alarm recovery differential: (0.5÷20.0) Intervention differential for recovery of humidity

alarm.

AHd Humidity alarm delay: (0÷255 min) time interval between the detection of an alarm condition and

the corresponding alarm signalling.

dHo Delay of humidity alarm at start-up: (0min÷23h 50min) time interval between the detection of the

humidity alarm condition after the instrument power on and the alarm signalling.

doH Alarm delay at the end of defrost: (0 255 min) Time interval between the detection of the

humidity alarm condition at the end of defrost and the alarm signalling.

doA Open door alarm delay:(0÷255 min) delay between the detection of the open door condition and

its alarm signalling: the flashing message “dA” is displayed.

tbA Alarm relay status after pushing a key: on= the relay remains on; off= the relay is switched off.
nPS Pressure switch number: (0 15) Number of activation of the pressure switch, during the “did”

interval, before signalling the alarm event (I2F= PAL).

If the nPS activation in the “did” time is reached, switch off and on the instrument to restart

normal regulation.

PROBE INPUTS
Ot Thermostat probe calibration: (-12.0 12.0°C/ -21 21°F) allows to adjust possible offset of the

thermostat probe.

OE Evaporator probe calibration: (-12.0 12.0°C/ -21 21°F) allows to adjust possible offsets of the

evaporator probe.

O3 Humidity probe calibration: (-10 10 RH) allows to adjust possible offsets of the humidity probe.
P2P Evaporator probe presence: n= not present: the defrost stops only by time; y= present: the

defrost stops by temperature and time.

P3P Humidity probe presence: n= not present; y= present.
LCI Readout with 4 mA : (-999 ÷ 999). Adjustment of read out corresponding to 4mA signal.
UCI Readout with 20 mA : (-999 ÷ 999). Adjustment of read out corresponding to 20mA signal.

DIGITAL INPUTS
i1P Digital input polarity: CL : the digital input is activated by closing the contact; OP : the digital input

is activated by opening the contact

i1F Digital input operating mode: configure the digital input function: EAL = generic alarm; bAL =

serious alarm mode; PAL = Pressure switch; Ht = heating relay safety; dor = door switch

odc Outputs status when open door: on = normal; Fan = Fan OFF; oFF = all the loads off
rrd Outputs restarting after doA alarm: no = outputs not affected by the doA alarm; yES = outputs

restart with the doA alarm;

did Time interval/delay for digital input alarm:(0 255 min.) Time interval to calculate the number of

the pressure switch activation when I1F=PAL. If I1F=EAL or bAL (external alarms), “did” parameter

defines the time delay between the detection and the successive signalling of alarms.

OTHER
oA1 Light relay configuration (XH460L terminals 3-4): ALr = alarm; dEH = dehumidifier; onF = on/off

relay: close with instrument on, open with instrument off; Lig = light, ESt, dEF not select

Adt RS485 serial address for temperature loads (0÷247) identifies the instrument within a control or

supervising system.

AdH RS485 serial address for humidity loads (0÷247) identifies the instrument within a control or

supervising system.

Ptb Parameter table: (read only) it shows the original code of the dIXEL parameter map.
rEL Software release: (read only) Software version of the microprocessor.
Prd Probes display: (read only) display the temperature values of the evaporator probe Pb2.
Pr2 Access to the protected parameter list (read only).

9. DIGITAL INPUT

One digital input is present configurable by user by means of the i1F parameter according to the following
descriptions.

9.1 DOOR SWITCH (I2F = dor)

It signals the door status and the corresponding relay output status through the “odc” parameter: no =
normal (any change); Fan = Fan OFF; oFF = all the loads are switched 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 status of loads depends on the “rrd” parameter:

with rrd=no outputs are not affected by the doA alarm;
with rrd=yES = outputs restart with the doA alarm;

The alarm stops as soon as the external digital input is disabled again. During this time and then for the

delay “dot” and “doH” after closing the door, the temperature and humidity alarms are disabled.

9.2 GENERIC ALARM (I1F = EAL)

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

activated.

9.3 SERIOUS ALARM MODE (I2F = 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 de­activated.

Dixell

Operating instructions

1592002910

1592002910 XH460L GB R1.0 18.05.04 XH460L 4/5

9.4 PRESSURE SWITCH (I2F = 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.

If the nPS activation in the did time is reached, switch off and on the instrument to restart normal
regulation.

9.5 HEATING RELAY SAFETY (i1F=Ht)

With i1F=Ht as soon as the digital input is activated for “did” time heating relay is disabled.
The alarm will stop as soon as the digital input is de-activated.

9.6 DIGITAL INPUTS POLARITY
The digital input polarity depends on the “i1P” parameters.

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

OP : the digital input is activated by opening the contact

10. INSTALLATION AND MOUNTING

Instruments XW240L 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.

10.1 XH460L: CUT OUT

165

150

31

+0.5

-0

+0.5

-0

+1

-1

Ø3 x2

11. ELECTRICAL CONNECTIONS

The instruments are provided with screw terminal block to connect cables with a cross section up to 2,5
mm2 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 su re 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.

11.1 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.

12. HOW TO USE THE HOT KEY

12.1 HOW TO PROGRAM A HOT KEY FROM THE INSTRUMENT (UPLOAD)

1. Program one controller with the front keypad.

2. When the controller is ON, insert the “Hot key” and push o key; the "uPL" message appears

followed a by flashing “End”

3. Push “SET” key and the End will stop flashing.

4. Turn OFF the instrument remove the “Hot Key”, then turn it ON again.

NOTE: the “Err” message is displayed for failed programming. In this case push again o key if you want
to restart the upload again or remove the “Hot key” to abort the operation.

12.2 HOW TO PROGRAM AN INSTRUMENT USING A HOT KEY (DOWNLOAD)

1. Turn OFF the instrument.

2. Insert a programmed “Hot Key” into the 5 PIN receptacle and then turn the Controller ON.

3. Automatically the parameter list of the “Hot Key” is downloaded into the Controller memory, the

“doL” message is blinking followed a by flashing “End”.

4. After 10 seconds the instrument will restart working with the new parameters.

5. Remove the “Hot Key”..

NOTE the message “Err” is displayed for failed programming. In this case turn the unit off and then on if
you want to restart the download again or remove the “Hot key” to abort the operation.

13. ALARM SIGNALLING

Message

Cause

Outputs

“P1”

Thermostat probe failure

Compressor and heating outputs off

“P2”

Evaporator probe failure

Defrost and by time

“P3”

Humidity probe failure

Humidity regulation off

“HA”

High temperature alarm

Outputs unchanged

“LA”

Low temperature alarm

Outputs unchanged

“HHA”

High humidity alarm

Outputs unchanged

“HLA”

Low humidity alarm

Outputs unchanged

“dA”

Door switch alarm

Outputs depending on the odC parameter

“EAL”

External alarm

Other outputs unchanged

“BAL”

Serious external alarm

Outputs OFF

“PAL”

Pressure switch alarm

Outputs OFF

The alarm message is displayed until the alarm condition recoveries.

All the alarm messages are showed alternating with the room temperature except for the “P1” which is
flashing. To reset the “EE” alarm and restart the normal functioning press any key, the “rSt” message is

displayed for about 3s.

13.1 SILENCING BUZZER

Once the alarm signal is detected the buzzer, if present, can be silenced by pressing any key.

13.2 ALARM RECOVERY
Probe alarms : “P1” (probe1 faulty), “P2”, “P3”; they automatically stop 10s after the probe restarts

normal operation. Check connections before replacing the probe.
Temperature alarms “HA” and “LA” automatically stop as soon as the thermostat temperature returns to
normal values or when the defrost starts.

Humidity alarms “HHA” and “LHA” automatically stop as soon as the humidity returns to normal values.
Door switch alarm “dA” stop as soon as the door is closed.
External alarms “EAL”, “BAL” stop as soon as the external digital input is disabled
Pressure switch alarm “PAL” alarm is recovered by switching OFF the instrument.

14. TECHNICAL DATA

Housing: self extinguishing ABS.
Case: XH460L: facia 38x185 mm; depth 76mm;
Mounting: XH460L: panel mounting in a 150x31 mm panel cut-out with two screws. 3 x 2mm.

Distance between the holes 165mm

Protection: IP20.
Frontal protection: IP65 with optional frontal gasket mod. RG-L (XH460L);
Connections: Screw terminal block 2,5 mm2 heat-resistant wiring and 6,3mm Faston
Power supply: 230Vac or 110Vac 10%; Power absorption: 7VA max.
Display: double display + icons.
Inputs: 1 NTC probe + 4÷20mA probe
Digital input: 1 free voltage
Relay outputs: compressor: relay SPST 20(8) A, 250Vac;

heather: relay SPST 8(3) A, 250Vac; defrost: relay SPST 8(3) A, 250Vac
fans: relay SPST 8(3) A, 250Vac; humidifier: relay SPST 8(3) A, 250Vac

de-humidifier: relay SPST 8(3) A, 250Vac
Other output : alarm buzzer (optional)
Data storing: on the non-volatile memory (EEPROM).
Kind of action: 1B.; Pollution grade: normal; Software class: A.
Operating temperature: 0÷60 °C.; Storage temperature: -25÷60 °C.
Relative humidity: 20 85% (no condensing)
Measuring and regulation range:

NTC probe: -40÷110°C (-58÷230°F)
Resolution: 0,1 °C or 1°C or 1 °F (selectable).

Accuracy (ambient temp. 25°C): ±0,5 °C ±1 digit

15. WIRING CONNECTIONS

15.1 XH460L

Room

119 10 12 13 1716 18 19 21 22 2314 15

LN

Comp

20(8)A
250V~

62 73 84 51

Fan

8(3)A

250V~

8(3)A

250V~

8(3)A

250V~

8(3)A

250V~

Def

20

Heater Hum

8(3)A

250V~

Def

NC

Supply 115Vac: 14-15 terminals

16. DEFAULT SETTING VALUES

Set temperature

Set humidity

Duration

Freezing Phase

5.0 °C

50.0 RH%

5.00 h

Proving Phase

5.0 °C

50.0 RH%

5.00 h

Label

Value

Menu

Description

Range

dbt

2.0

Pr1

Half dead band width for temperature

0.1°C o 1°F ÷ 25°C o 77°F

dbH

5.0

Pr1

Half dead band width for humidity

0.5 ÷ 50

LS

-40.0

Pr2

Minimum temperature set point limit

-50.0°C o –58°F ÷ Set T

uS

110

Pr2

Maximum temperature set point limit

Set T ÷ 110°C o 230°F

odS

1

Pr2

Outputs activation delay at start up

0 ÷ 250 min

Ac

1

Pr1

Anti-short cycle delay

0 ÷ 30 min

tHu

c-H

Pr2

Humidity regulation

db = dehumidifier relay.; cHu

= dehum+ compr.; c-H=

without dehum. relay

LSH

0.0

Pr2

Minimum humidity set point limit

Lci ÷ Set H

uSH

100

Pr2

Maximum humidity set point limit

Set H ÷ uci

cF

°C

Pr2

Measurement unit

°C ÷°F

rES

dE

Pr2

Resolution (for °C):

in = integer / dE = decimal

rEH

Hd

Pr2

Resolution for RH%:

in = integer / Hd = half digit

trC

co

Pr2

Instrument behaviour at the end of the cycle

co=start hoolding, in=stop

regulation, cL=restart the first

phase+End message; cLE =

restart the first phase

tdf

rE

Pr2

Defrost type

rE, rT, in

EdF

in

Pr2

Defrost mode

In, Sd

SdF

0.0

Pr2

Set point for SMART DEFROST

-30 ÷ +30°C / -22÷+86°F

dtE

8.0

Pr2

Defrost termination temperature

-50,0÷110°C/ -58÷230°F

idF

6

Pr1

Interval between defrosts

1 ÷ 120 h

MdF

20

Pr1

Duration of defrost

0 ÷ 250 min

dFd

it

Pr2

Display during defrost

rt / it / SEt / dEF / dEG

dAd

30

Pr2

Defrost display time out

0 ÷ 250 min

Dixell

Operating instructions

1592002910

1592002910 XH460L GB R1.0 18.05.04 XH460L 5/5

Label

Value

Menu

Description

Range

Fdt

0

Pr2

Draining time

0÷60 min.

dPo

no

Pr2

First defrost after start up

n ÷ y

Hud

no

Pr2

Humidity control during defrost

no; yES

Fnc

c-n

Pr2

Fan operating mode

c-n / c-Y / o-n / o-Y

ALc

Ab

Pr2

Temperature alarm configuration

rE = relative / Ab = absolute

ALL

-40.0

Pr1

Low temperature alarm setting

0°C ÷ 50.0°C / -50.0°C ÷ ALu

ALu

110

Pr1

High temperature alarm setting

0°C ÷ 50.0°C / ALL ÷ 110°C

ALH

1.0

Pr2

Temperature alarm recovery differential

0.1°C o 1°F ÷ 25°C o 77°F

ALd

15

Pr2

Temperature alarm delay

0 ÷ 250 min

dAo

1.3

Pr2

Delay of temperature alarm at start-up

0.0 ÷ 23.5 h

EdA

20

Pr2

Alarm delay at the end of defrost

0 ÷ 250 min

dot

20

Pr2

Delay of temperature alarm after closing the
door

0 ÷ 250 min

AHc

Ab

Pr2

Humidity alarm configuration

rE = relative / Ab = absolute

AHL

0.0

Pr1

Low humidity alarm setting

0 ÷ 50 / Lci ÷ AHu

AHu

100

Pr1

High humidity alarm setting

0 ÷ 50 / AHL ÷ uci

AHH

2.0

Pr2

Humidity alarm recovery differential

0.5 ÷ 25

AHd

15

Pr2

Humidity alarm delay

0 ÷ 250 min

dHo

1.3

Pr2

Delay of humidity alarm at start-up

0.0 ÷ 23.5 h

doH

20

Pr2

Alarm delay at the end of defrost

0 ÷ 250 min

doA

20

Pr2

Open door alarm delay

0 ÷ 250 min ( 250 = nu )

tbA

oFF

Pr2

Relay status after pushing a key

on÷oFF

nPS

15

Pr2

Pressure switch number

0÷15

ot

0.0

Pr1

Thermostat probe calibration

-12.0 ÷ 12.0

oE

0.0

Pr2

Evaporator probe calibration

-12.0 ÷ 12.0

o3

0.0

Pr1

Humidity probe calibration

-10 ÷ 10

P2P

YES

Pr2

Evaporator probe presence

no = absent / YES = present

P3P

YES

Pr2

Humidity probe presence

no = absent / YES = present

Lci

0.0

Pr2

Readout with 4 mA

-999 ÷ 999

uci

100

Pr2

Readout with 20 mA

-999 ÷ 999

i1P

cL

Pr2

Digital input polarity

cL =open / oP = close

i1F

dor

Pr2

Digital input configuration

dor / PAL / EAL / bAL / Ht

odc

FAn

Pr2

Outputs status when open door

on / Fan / oFF

rrd

YES

Pr2

Outputs restarting after doA alarm

no = no / YES = yes

did 0 Pr2

Digital input alarm delay

0÷255 min.

oA1

LiG

Pr2

Light relay configuration (XH460L
terminals 3-4,):

ALr = alarm; dEH =

dehumidifier; onF = on/off; Lig

= light, ESt, dEF not select

Adt

1

Pr2

Serial address for temperature

0÷247 num

AdH

1

Pr2

Serial address for humidity

0÷247 num

Ptb

0.0

Pr2

Parameter table

- - -

rEL

100

Pr2

Software release

- - -

Prd

cL

Pr2

Probes display

Pb1÷Pb3

Pr2

321

Pr1

Access to the protected parameter list

- - -