dixell XH240K Operating Instructions Manual
dIXEL
Operating instructions
1592002750
1592002750 XH240K GB r1.0 15.06.2004 * XH240K 1/4
XH240K
TEMPERATURE AND HUMIDITY CONTROLLER
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 XH240K is microprocessor controller suitable for applications on medium temperature
refrigerating units. It must be connected by means of a two-wire cable (∅ 1mm) at a distance of
up to 30 meters to the keyboard VH620, 100x64mm format. It controls both humidity and
temperature. It has 4 output relays to control compressor, heating elements , fan and humidifier.
It has 2 analogue inputs: one for temperature control, the other for humidity. There is one digital
input (free contact). 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_TEMP-dbt”, CUT OUT is when the temperature reaches the
set point.
• Compressor output CUT IN is “ SET_TEMP +dbt”, CUT OUT is when the temperature
reaches the set point.
3.1 DEFROST
During the defrost temperature regulation is disabled.. Parameter “IdF” controls the interval
between defrost cycles, while its length is controlled by parameter “MdF”.
To disable defrost set the MdF parameter to zero.
Humidity regulation, during defrost, depends on the Hud parameter. With
Hud=no humidity regulation is disabled during defrosts.
Hud=yES humidity regulation is performed also during defrosts.
4. HUMIDITY REGULATION
The humidity regulation is performed through neutral zone, by humidifying dehumidifying.
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 disable when humidity reaches the set values.
4.2 DEHUMIDIFYING ACTION
The dehumidifying action is performed enabling the heating and compressor output 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_TEMP+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_TEMP is
reached at this point also the heating relay is enabled.
2. If is simultaneously present a request of heating (temp< SET_TEMP-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.
5. FANS
The fan control mode is selected by means of the “FnC” parameter:
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;
6. THE DISPLAY
To display and modify target
temperature set point. (SET_TEMP)
To display and modify target humidity
set point (SET_RH); in programming
mode it selects a parameter or confirm
an operation.
In programming mode it browses the
parameter codes or increases the
displayed value.
In programming mode it browses the
parameter codes or decreases the
displayed value.
By holding it pressed for 3s the defrost
is started..
Switch ON and OFF the instrument.
KEY COMBINATIONS
+
To lock and unlock the keyboard
+
To enter the programming mode.
+
To exit the programming mode.
6.1 ICONS AND SYMBOLS
Each LED function is described in the following table.
LED2 LED3
LED4
Temperature Display
Humidity Display
LED MODE FUNCTION
ON - ALARM signal
Led 4
ON - Instrument in stand by.
- In “Pr2” indicates that the parameter is also present in “Pr1”.
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
dIXEL
Operating instructions
1592002750
1592002750 XH240K GB r1.0 15.06.2004 * XH240K 2/4
LED MODE FUNCTION
ON Fan is running
ON RH%
ON Dehumidifying enabled
ON Humidifying enabled
(umid)
FLASHING Humidity Set programming phase
6.2 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.
6.3 TO START A MANUAL DEFROST
1. Push the DEF key for more than 2 seconds and a manual defrost will start.
6.4 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”
6.5 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.
6.6 HOW TO CHANGE THE PARAMETER VALUE
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.
6.7 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.
6.8 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.
7. 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_TEMP). The compressor is enabled when the
temperature increases and reaches the SET_TEMP + dbt value. It is turned off when it
comes back to the SET_TEMP. The heating output is enabled when temperature is less
than SET_TEMP -dbt value and disabled when the SET_TEMP 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.
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
CF Measurement unit: °C= Celsius; °F= Fahrenheit
rES Resolution (for °C): it allows decimal point display. dE=0,1°C; in=1°C
rEH Resolution for RH%: in = integer; Hd= half digit.
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) no evaporator probe, it sets the defrost duration.
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.
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.
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.
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