Dixell
Operating instructions
1592002711
1592002711 XH260L-V GB r1.0 12.01.04
XH260L - XH260V
1/5
XH260L – XH260V
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 XH260L, 38x185 format, and the XH260V, 100x64 format, are microprocessor controllers, suitable
for applications on medium or low temperature refrigerating units. They control both humidity and
temperature. They have 6 output relays to control compressor, heating elements, defrost, fan de-
humidifier and humidifier. They have 2 NTC inputs one for thermostat the other one for defrost. It’s also
present and 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_TEMP-dbt”, CUT OUT is when the temperature reaches the set
point.
• Compressor output CUT IN is “ SEdbt”, 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 CONFIGURATION
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 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>Sdbt) and dehumidifying (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
> 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, (XH260L terminals 3-4, XH260V terminals 11-12) 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>Sdbt) and dehumidifying (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 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.
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.
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)
Switch ON and OFF the instrument.
KEY COMBINATIONS
+
To lock and unlock the keyboard
+
To enter the programming mode.
