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AR2-5 INSTRUCTIONS FOR USE
Thank you for having chosen an LAE electronic product. Before installing the instrument, please read this instruction booklet
carefully in order to ensure safe installation and optimum performance.
DESCRIPTION
INDICATIONS
Thermostat output
Fan output
Defrost output
Activation of 2nd parameter set
Alarm
Fig.1 - Front panel
Info / Setpoint button.
Manual activation / Increase button.
Manual defrost / Decrease button.
Exit / Stand-by button.
INSTALLATION
■
Insert the controller through a hole measuring 71x29 mm.
■
Make sure that electrical connections comply with the paragraph "wiring diagrams". To reduce the effects of electromagnetic
disturbance, keep the sensor and signal cables well separate from the power wires.
■
Fix the controller to the panel by means of the suitable clips, by pressingly gently; if fitted, check that the rubber gasket adheres
to the panel perfectly, in order to prevent debris and moisture infiltration to the back of the instrument.
■
Place the probe T1 inside the room in a point that truly represents the temperature of the stored product.
■
Place the probe T2 on the evaporator where there is the maximum formation of frost.
■
The function of probe T3 is determined by the parameter T3. With
T3=DSP the probe measures the temperature to be displayed.
With T3=CND the probe measures the condenser temperature, it must therefore be placed between the fins of the condensing
unit. With T3=2EU the probe measures the temperature of the second evaporator and it must therefore be placed where there is
the maximum formation of frost. With T3=NON, the third probe is disabled.
OPERATION
DISPLAY
During normal operation, the display shows either the temperature measured or one of the following indications:
Defrost in progress
Condenser high pressure alarm
Controller in stand-by
Room high temperature alarm
Condenser clean warning
Room low temperature alarm
Door open alarm
Probe T1 failure
Condenser high temperature alarm
Probe T2 failure
Probe T3 failure
INFO MENU
The information available in this menu is:
Instant probe 1 temperature
Maximum probe 1 temperature recorded
Instant probe 2 temperature
Minimum probe 1 temperature recorded
*
Instant probe 3 temperature
Compressor working weeks
*
**
Minutes of the Real Time Clock
Keypad state lock
Hours of the Real Time Clock
*: displayed only if enabled (see §Configuration Parameters) **: displayed only if ACC > 0
Access to menu and information displayed.
SETPOINT : display and modification
■
Press and immediately release button
.
■
Press button
for at least half second, to display the
■
With button
or
select the data to be displayed.
setpoint value.
■
Press button
to display value.
■
By keeping button
■
To exit from the menu, press button
or wait for 10 seconds.
the desired value (adjustment is within the minimum SPL and
Reset of THI, TLO, CND recordings
the maximum SPH limit).
■
With button
or
select the data to be reset.
■
When button
is released, the new value is stored.
■
Display the value with button
.
■
While keeping button
pressed, use button
.
STAND-BY
Button
, when pressed for 3 seconds, allows the controller to be put on a standby or output control to be resumed (with SB=YES only).
KEYPAD LOCK
The keypad lock avoids undesired, potentially dangerous operations, which might be attempted when the controller is operating in
a public place. In the INFO menu, set parameter LOC=YES to inhibit all functions of the buttons. To resume normal operation of
keypad, adjust setting so that LOC=NO.
SELECTION OF SECOND PARAMETER GROUP
It's possible to select control parameters between two different pre-programmed groups, in order for the fundamental control
parameters to be adapted quickly to changing needs. Changeover from Group I to Group II (and vice versa) may take place
MANUALLY by pressing button
for 2 seconds (with IISM=MAN), or AUTOMATICALLY when heavy duty conditions are detected
(with IISM=HDD), or when IISM=DI2 and the AUXILIARY INPUT DI2 is activated (the activation of DI2 selects Group II). If
IISM=NON, switchover to Group II is inhibited. The activation of Group II is signalled by the lighting up of the relevant LED on the
controller display.
REAL TIME CLOCK SETTING
The Real Time Clock (RTC) can be adjusted directly from the Info Menu (see Setpoint modification procedure). Tens of minutes
MIN range from 0 to 59 and Hours HRS range from 0 to 23. If RTC is adjusted just before an upcoming change of hour, verify the
correctness of the setting again. The RTC does not automatically change upon Daylight Saving Time.
DEFROST
Automatic defrost. Defrost starts automatically at fixed time-intervals or at programmed scheduled (up to six per 24 hours).
■
Timed defrost
. With DFM=TIM defrosts take place at regular intervals when the timer reaches the value of DFT. For example,
with DFM=TIM and DFT=06, a defrost will take place every 6 hours.
■
Scheduled defrost
. With DFM=RTC defrost takes place at time specified by DH1...DH6. The format of time is "HH.M", where
HH are hours and M are tens of minutes. To disable one or more of the 6 scheduled defrosts, assign the value "---" (it is the value
after "23.5"). Parameters DH1...DH6 are accessible both in the setup (see §Configuration Parameters) and by keeping button
pressed for 4 seconds during normal operation.
■
Synchronised defrost
. With DI2=DSY and when more units (models AR2-5x3xxx only) are linked to each other as per Fig.
3, synchronised defrosts of all linked controllers will take place. The first controller which will start defrost, will also get all other
controllers synchronised.
■
Manual or remote defrost start
. If DFM=TIM it's possible to manually start a defrost, by pressing button
DFM=RTC hold button
down for 4 seconds to display DH1, then press button
again for 4 seconds to manually start a defrost.
Defrost may be also started remotely, if DI2=RDS, through the making of the auxiliary contact DI2.
Defrost type. Once defrost has started, Compressor and Defrost outputs are controlled according to parameter DTY. If FID=YES,
the evaporator fans are active during defrost.
Defrost termination. The actual defrost duration is influenced by a series of parameters.
■
Time termination
: T2=NO and T3 different from 2EU: the evaporator temperature is not monitored and defrost will last as long
as time DTO.
■
Temperature monitoring of one evaporator
: T2=YES and T3 different from 2EU. In this case, if the sensor T2 measures the
temperature DLI before the time DTO elapses, defrost will be terminated in advance.
■
Temperature monitoring of two evaporators
: T2=YES, T3=2EU, OAU=2EU. This function is for the control of two independent
evaporators and it switches off the individual heating of the evaporator which gets to temperature DLI first, waiting for the second
evaporator to get to that temperature before the time DTO elapses.
Resuming thermostatic cycle. When defrost is over, if DRN is greater than 0, all outputs will remain off for DRN minutes, in
order for the ice to melt completely and the resulting water to drain. Moreover, if probe T2 is active (T2=YES), the fans will re-start
when the evaporator gets to a temperature lower than FDD; Vice versa, if probe T2 is not active (T2=NO) or after defrost has
come to an end, such condition does not occur by end of the time FTO, after FTO minutes have elapsed the fans will be switched
on anyway.
Caution: if DFM=NON or C-H=HEA all defrost functions are inhibited; if DFT=0, automatic defrost functions are excluded. During
a high pressure alarm, defrost is suspended. During defrost, high temperature alarm is bypassed.
CONFIGURATION PARAMETERS
■
To get access to the parameter configuration menu, press button
■
With button
or
select the parameter to be modified.
■
Press button
to display the value.
■
By keeping button
pressed, use button
■
When button
is released, the newly programmed value is stored and the following parameter is displayed.
■
To exit from the setup, press button
or wait for 30 seconds.
PAR
RANGE
DESCRIPTION
SCL
1°C;
Readout scale.
2°C;
1°C (with INP=SN4 only): measuring range -50/-9.9 ... 19.9/80°C
°F
2°C : measuring range -50 ... 120°C
°F : measuring range -55 ... 240°F
Caution: upon changing the SCL value, it is then absolutely necessary to re-configure the
parameters relevant to the absolute and relative temperatures (SPL, SPH, SP, ALA, AHA, etc..).
SPL
-50..SPH
Minimum limit for SP setting.
SPH
SPL.120°
Maximum limit for SP setting.
SP
SPL... SPH
Setpoint (value to be maintained in the room).
C-H
REF; HEA
Refrigerating (REF) or Heating (HEA) control mode.
HYS
1...10°
OFF/ON thermostat differential.
ON
OFF
Refrigerating control (C-H=REF)
CRT
0...30min
Compressor rest time. The output is switched on again after CRT minutes have elapsed since the
previous switchover. We recommend to set CRT=03 with HYS<2.0°.
CT1
0...30min
Thermostat output run when probe T1 is faulty. With CT1=0 the output will always remain OFF.
CT2
0...30min
Thermostat output stop when probe T1 is faulty. With CT2=0 and CT1>0 the output will always be ON.
Example: CT1=4, CT2= 6: In case of probe T1 failure, the compressor will cycle 4 minutes ON and 6 minutes OFF.
CSD
0..30min
Compressor stop delay after the door has been opened (active only if DS=YES).
DFM
NON;
Defrost start mode
TIM;
NON : defrost function is disabled (the following parameter will be FID).
RTC
TIM : regular time defrost.
RTC : the defrost time is scheduled by parameters DH1, DH2...DH6.
DFT
0...99 hours
Time interval among defrosts. When this time has elapsed since the last defrost, a new defrost cycle is started.
DH1
HH.M
Scheduled time for defrost 1 to 6. HH hours from midnight, M tens of minutes. Accepted values go from
00.0 to 23.5. After "23.5" the value is "---" that means "skipped defrost". Example: DH1=8.3 means 8.30
...
AM.
DH6
DLI
-50...120°
Defrost end temperature.
DTO
1...120min
Maximum defrost duration.
DTY
OFF;
Defrost type
ELE;
OFF: off cycle defrost (Compressor and Heater OFF).
GAS
ELE: electric defrost (Compressor OFF and Heater ON).
pressed, use button
or
to set
GAS: hot gas defrost (Compressor and Heater ON).
DPD
0...240sec
Evaporator pump down. At the beginning of defrost, defrost outputs (determined by DTY) are OFF for
DPD seconds.
DRN
0...30min
Pause after defrost (evaporator drain down time).
DDM
RT;
Defrost display mode. During defrost the display will show:
LT;
RT: the real temperature;
SP;
LT : the last temperature before defrost;
DEF
SP : the current setpoint value;
DEF : "dEF".
DDY
0...60min
Display delay. The display shows the information selected with parameter DDM during defrost and for
DDY minutes after defrost termination.
FID
NO/YES
Fans active during defrost.
FDD
-50...120°
Evaporator fan re-start temperature after defrost.
FTO
0...120min
Maximum evaporator fan stop after defrost.
FCM
NON;
Fan mode during thermostatic control.
TMP;
NON : The fans remain ON all the time;
TIM
TMP : Temperature-based control. The fans are ON when the compressor is ON. When the compressor
is turned OFF, the fans remain ON as long as the temperature difference Te-Ta is greater than FDT. The
fans are turned ON again with FDH differential. (Te = Evaporator temperature, Ta = Air temperature);
TIM : Timed-based control. The fans are
ON when the compressor is ON. When the
compressor is OFF, the fans switch ON and
OFF according to parameteres FT1, FT2,
FT3 (See Fig.2).
Fig.2 Time-optimised fan control (FCM=TIM)
FDT
-120...0°
Evaporator-Air temperature difference for the fans to turn OFF after the compressor has stopped.
FDH
1...120°
Temperature differential for fan re-start.
Example: FDT = -1, FDH=3. In this case, after the compressor has stopped, the fans are OFF when Te
> Ta - 1 (FDT), whereas the fans are ON when Te < Ta - 4 (FDT-FDH).
FT1
0...180sec
Fan stop delay after compressor stop. See Fig. 2
FT2
0...30min
Timed fan stop. With FT2=0 the fans remain on all the time.
for 4 seconds. If
FT3
0...30min
Timed fan run. With FT3=0, and FT2 > 0, the fans remain off all the time.
ATM
NON;
Alarm threshold management.
ABS;
NON : all temperature alarms are inhibited (the following parameter will be ADO).
REL
ABS : the values programmed in ALA and AHA represent the real alarm thresholds.
REL : the values programmed in ALR and AHR are alarm differentials referred to SP and SP+HYS.
ON
OFF
SP-ALR
SP
Temperature alarm with relative thresholds,
refrigerating control (ATM=REL, C-H=REF).
ALA
-50... 120°
Low temperature alarm threshold.
AHA
-50... 120°
High temperature alarm threshold.
ALR
-12... 0°
Low temperature alarm differential. With ALR=0 the low temperature alarm is excluded.
AHR
0... 12°
High temperature alarm differential. With AHR=0 the high temperature alarm is excluded.
ATI
T1; T2; T3
Probe used for temperature alarm detection.
ATD
0... 120min
Delay before alarm temperature warning.
ADO
AHM
+
for 5 seconds.
or
to set the desired value.
AHT
ACC
IISM
IISL
IISH
IISP
IIHY
IIFC
ON
HDS
IIDF
OFF
SP
SP+HYS
T[°]
SP-HYS
SP
T[°]
Heating control (C-H=HEA)
DI2
LSM
OA1
2CD
INP
OS1
OS2
OS3
TLD
SIM
ADR
WIRING DIAGRAMS
COMPR.
COMPR. OFF
COMPR.
ON
ON
ON
OFF
FT1
FT2
FT3
FT2
FT3
ON
T[°]
T[°]
OFF
SP+HYS+AHR
SP-HYS-ALR
SP
SP+AHR
Temperature alarm with relative thresholds,
heating control (ATM=REL, C-H=HEA).
0... 30min
Delay before door open alarm warning.
NON;
Operation in case of high condenser alarm
ALR;
NON : high condenser alarm inhibited.
STP;
ALR : in case of alarm, "HC" flashes in the display and the buzzer is switched on.
STP : in addition to the alarm symbols displayed, the compressor is stopped and defrosts are suspended.
-50...120°
Condensation temperature alarm (referred to T3 probe).
0...52
Condenser periodic cleaning. When the compressor operation time, expressed in weeks, matches the
weeks
ACC value programmed, "CL" flashes in the display. With ACC=0 the condenser cleaning warning is
disabled and CND disappears from Info Menu.
NON;
Switchover mode to second parameter set
MAN;
NON : inhibition to use the second parameter group (the following parameter will be SB).
HDD;
MAN : button
switches the two parameter groups over.
DI2
HDD : automatic switchover to the second parameter group, when heavy duty conditions are detected.
DI2 : switchover to the second parameter group when the auxiliary DI2 input makes.
-50... IISH
Minimum limit for IISP setting.
IISL... 120°
Maximum limit for IISP setting.
IISL... IISH
Setpoint in mode 2.
1... 10°
OFF/ON differential in mode 2.
NON;TMP;
Fan control in mode 2. See FCM.
TIM
1...5
Controller sensitivity for the automatic switchover from Group I to Group II (1=minimum, 5=maximum).
0...99 hours
Time interval among defrosts in mode 2.
SB
NO/YES
Stand-by button
enabling.
DS
NO/YES
Door switch input enabling (closed when door is closed).
NON;
DI2 digital input operation
HPS;
NON : digital input 2 not active.
IISM;
HPS : when contact opens a condensing unit high pressure alarm occurs.
RDS;
IISM : when contact makes the controller will use group 2 parameters.
DSY
RDS : when contact makes a defrost is started (remote control).
DSY : defrost synchronisation. The controllers, linked as per Fig. 3, will all start and end defrost together.
The first controller in defrost will get defrost of all the others started. The last controller ending defrost will
get defrost of all the others stopped.
NON;
Light control mode
MAN;
NON : light output not controlled.
DOR
MAN : light ouput controlled through button
(if OA1=LGT).
DOR : light ouput switched on when door is opened (if OA1=LGT).
NON;
AUX output operation
0-1;
NON : output disabled (always off).
LGT;
0-1 : the relay contacts follow the on/standby state of controller.
2CU;
LGT : output enabled for light control.
2EU;
2CU : output programmed for the control of an auxiliary compressor.
AL0;
2EU : output enabled for the control of the electrical defrost of a second evaporator.
AL1
AL0 : contacts open when an alarm condition occurs.
AL1 : contacts make when an alarm condition occurs.
0...120 sec
Auxiliary compressor start delay. If OA1=2CU the auxiliary output is switched on with a delay of 2CD
seconds after the main compressor has cut-in. Both compressors are turned off at the same time.
SN4; ST1
Temperature sensor selection. With INP=SN4, the probes must be the LAE models SN4..; with INP =
ST1, the probes must be the LAE models ST1...
-12.5..12.5°C Probe T1 offset.
T2
NO/YES
Probe T2 enabling (evaporator).
-12.5..12.5°C Probe T2 offset.
T3
NON;
Auxiliary probe T3 operation
DSP;
NON : probe T3 not fitted.
CND;
DSP : temperature T3 to be displayed.
2EU
CND : condenser temperature measurement.
2EU : second evaporator temperature measurement.
-12.5..12.5°C Probe 3 offset.
1...30 min
Delay for minimum temperature (TLO) and maximum temperature (THI) logging.
0...100
Display slowdown.
1...255
AR2-5 address for PC communication.
-
+
-
+
remote
data
17
18
19
21
20
23
22
24
remote
data
17
18
19
21
20
23
22
24
remote
DI2
Door
T2
T1
T3
DI2
Door
T2
T1
T3
AR2-5C34W-BG
AR2-5C34W-BG
AUX
AUX
5
6
1
4
2
3
7
8
5
6
1
4
2
3
7
8
Fig.3 Connection for synchronising defrost start and termination
Def sync
RS485
-
+
data I/O
17 18
19 21 20
23
22
24
DI2
Door
T1
T2
T3
AUX
AUX
12(5)A
8(3)A
7(2)A
7(2)A
5
6
1
4
2
3
7
8
AR2-5C34W-BG
115...230Vac
TECHNICAL DATA
Power supply
AR2-5....D
12Vac/dc ±10%, 3W
AR2-5....W
110 - 230Vac±10%, 50/60Hz, 3W
Relay output
Compressor
12(5)A 240Vac
Defrost
7(2)A 240Vac
Evap. Fan
8(3)A 240Vac
Auxiliary loads
7(2)A 240Vac
Input
NTC 10KΩ@25°C
LAE Part No. SN4...
PTC 1000Ω@25°C
LAE Part No. ST1...
Measurement Range
-50...120°C, -55...240°F
-50 / -9.9 ... 19.9 / 80°C (NTC10K only)
Measurement accuracy
<0.5°C within the measurement range
Real Time Clock battery
>150 hours; self-rechargeable
Operating conditions
-10 ... +50°C; 15%...80% r.H.
CE (Reference norms)
EN60730-1; EN60730-2-9;
EN55022 (Class B);
EN50082-1
-
+
data
17
18
19
21
20
23
22
24
DI2
Door
T2
T1
T3
AR2-5C34W-BG
AUX
5
6
1
4
2
3
7
8
Aux
VIA PADOVA, 25
31046 ODERZO /TV /ITALY
TEL. +39 - 0422 815320
FAX +39 - 0422 814073
www.lae-electronic.com
E-mail: sales@lae-electronic.com
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