Updated:

17/03/2010

CAREL ir33

Quick reference Handbook

Ver. 1.1 Pag.1/12

Eng
 Updated:
17/03/2010

MAIN FEATURES OF THE INSTRUMENT

USER INTERFACE

1. ON/OFF switch button – UP button to increase temperature values

2. DOWN button to decrease values - Activates/deactivates the

manual defrost

3. SET temperature button

4. Prg/mute button

5. Malfunctioning or failure warning icon

6. High/Low temperature alarm icon

7. icon is ON when defrost process starts

8. icon is ON when compressor starts

9. icon is ON when evaporator fans starts

10. icon is ON when an auxiliary output is active

Ver. 1.1 Pag.2/12

Eng
 Updated:
17/03/2010

POWER OFF When the instruments is switched off the display shows the label OFF and
all internal relays are disabled (not energized)

POWER ON
When the controller is switched on a special procedure tests the display
and the keypad. The display is completely ON for 2 seconds

Three segments “---“ on the display are visualized for 2 seconds and then
the controller becomes operative

Compressor icons flashes and the compressor activation is delayed by

safety times

SET CAVITY
To display or to set the temperature, proceeds as follows:
TEMPERATURE

Keep SET button pressed for more than 1 second. The instruments
displays the temperature value

Increase or decrease the set point using UP/DOWN buttons, until reaching
the desired value

Press SET button again to confirm the new value

FREQUENT USE Press Prg/mute button more than 5 seconds the instruments shows the
PARAMETER code of the first adjustable parameter (type “F”) – if an alarm is active,
(TYPE F) pressing this button, the buzzer is muted first.

FREQUENTLY USE PARAMETER LIST: St, rd, rt, rH, rL, dI, dt1, dt2,
dP1, dP2, dd, d8, d/1, d/2, AL, AH, Ad, F1, Fd

CONFIGURATION Access to the configuration parameters is protected by password that

PARAMETER avoid unwanted modifications or access by unauthorized personel.
(TYPE C) Proceeds as follows:

1. Press Prg/Mute and Set buttons together for more than 3

seconds; display shows a flashing numerical code “0” that indicates
the password prompt

2. Press UP button to set the password – CAREL thermoregulators are

provided with password set to 11 (the code of the password allows
access to the configuration parameters)

3. Confirm by pressing the Set button to enter in the programming

mode and scroll up/down the operating parameters list

4. Display shows the code of the first adjustable type “C” parameter
/2

Ver. 1.1 Pag.3/12

Eng
 Updated:
17/03/2010

MANUAL Manual defrost is activated or deactivated if DEF/DOWN button is keep

DEFROST pressed more than 5 seconds.

When defrost starts display shows dFb (defrost begining)

Defrost’s warning icon is ON when defrost is active

Defrost can be interrupted simply by pressing again the DEF/DOWN

button more than 5 seconds. Display shows the message dFE (defrost
End)

MODIFYING THE After having displayed the first operating parameter, either type C or type
PARAMETERS F, it is necessary to procedes as follows:

1. Press UP/DOWN button until reaching the parameter to be

modified. When scrolling the list, an icon appears on the display
that indicates the category the parameter belongs to

2. Press SET button to display the parameter’s value

3. Increase or decrease its value using UP/DOWN button

4. Press again SET button to temporarily save the new value, closing
the parameter adjustment and return to the display of the
parameter code

Repeat the operations from point 1 to 4

STORING THE To definitively store the new values of the modified parameters, procede
NEW ASSIGNED as follows:
VALUES
1. Press the Prg/mute button more than 5 seconds

2. Display shows the label Pro

The controller step out the parameter setting procedure and the display
shows current temperature value.

RESET ANY All modifications made to the parameters, temporarily stored into the
MODIFICATIONS internally memory of the controller, can be cancelled and normal operation
resumed by not pressing any button for 60 second, thus allowing the
parameter setting session to expire due to timeout

Ver. 1.1 Pag.4/12

Eng
 Updated:
17/03/2010

HOW TO CHECK To check current temperature measured by a single installed probe,

CAVITY PROBE proceeds as follow:
TEMPERATURE
1. refers to the previous step how to get in the configuration
parameter session - type C parameter

2. scroll the configuration parameter list, by using UP/DOWN

buttons, until display shows the parameter /C1 (calibration or
offset for cavity probe)

3. press SET button

4. display shows the probe calibration value, used to correct the

temperature measured by the probe by means of an offset

BE CAREFUL ⇒ DO NOT ADJUST THE

CALIBRATION VALUE

5. Press again SET button

6. display shows the current temperature value measured by the

probe

7. press SET button to return to display of the parameter code /C1

HOW TO CHECK Current evaporator probe temperature is available by means of the

EVAPORATOR parameter /C2 (calibration or offset for evaporator probe)
TEMPERATURE
To check temperature value proceeds as previously indicated from step 1
to step 2, considering the configuration parameter /C2

HOW TO CHECK If the condenser probe is installed it is possible to check condenser

CONDENSER temperature by means of the parameter /C3 (calibration or offset for
TEMPERATURE condenser probe)

To check temperature value proceeds as previously indicated from step 1

to step 2, considering the configuration parameter /C3

Ver. 1.1 Pag.5/12

Eng
 Updated:
17/03/2010

TABLE OF OPERATING PARAMETERS

N° Code Range U.M. Description

TEMPERATURE PROBE MANAGEMENT PARAMETERS
1 /2 0...15 -- Measurement stability
2 /3 0...15 -- Probe display response
3 /4 0…100 -- Virtual probe
4 /5 0/1 Flag Selection °C or °F
5 /6 0/1 Flag Decimal point
6 /tl 1…6 -- Display on terminal
7 /tE 0...6 -- Display on external terminal
8 /P 0…2 -- Type of probe
9 /A2 0…3 -- Configuration probe 2
10 /A3 0…3 -- Configuration probe 3
11 /c1 -20…20 °C/°F (/10) Calibration probe 1
12 /c2 -20…20 °C/°F (/10) Calibration probe 2
13 /c3 -20…20 °C/°F (/10) Calibration probe 3
TEMPERATURE CONTROL PARAMETERS
14 St r1…r2 °C/°F set point temperature
15 rd 0.1…20 °C/°F Control delta
16 rn 0…60 °C/°F Dead band
17 rr 0.1…20 °C/°F Reverse differential for control with dead band
18 r1 -50...r2 °C/°F Minimum set point allowed
19 r2 r1…200 °C/°F Maximum set point allowed
20 r3 0...2 Flag Operating mode
21 r4 -20...20 °C/°F Automatic night-time set point variation
22 r5 0...1 °C/°F Enable temperature monitoring
23 rt 0...999 °C/°F Temperature monitoring interval
24 rH - °C/°F Maximum temperature read
25 rL - °C/°F Minimum temperature read
COMPRESSOR SAFETY TIME AND ACTIVATION PARAMETERS
26 c0 0...15 Minutes Compressor and fan delay on start-up
Minimum time between two sequent compressor
27 c1 0…15 Minutes
starts
28 c2 0...15 Minutes Minimum compressor OFF time
29 c3 0...15 Minutes Minimum compressor ON time
30 c4 0…100 Minutes Duty setting
31 cc 0…15 Hours Continuous cycle duration
32 c6 0…15 Hours Alarm bypass after continuous cycle
33 c7 0...900 Seconds Maximum pump down time
34 c8 0...60 Seconds Compressor start delay after open PD valve

Ver. 1.1 Pag.6/12

Eng
 Updated:
17/03/2010

N° Code Range U.M. Description

35 c9 0...1 Flag Enable autostart function in PD
36 c10 0...1 Flag Select Pump down by time or pressure
37 c11 0...250 Seconds Second compressor delay
DEFROST MANAGEMENT PARAMETERS
38 d0 0...4 Flag Type of defrost
40 dI 0…250 Hours Interval between defrosts
41 dt1 -50…200 °C/°F End defrost temperature, evaporator
42 dt2 -50…200 °C/°F End defrost temperature, aux evap.
Defrost end temperature when defrost has done
43 dtP 0...200 °C/°F
with compressor OFF and fans ON
44 dP1 1…250 Minutes Maximum defrost duration, evaporator
45 dP2 1…250 Minutes Maximum defrost duration, aux evap.
46 d3 0...250 Minutes Defrost start delay
47 d4 0/1 Flag Enable defrost on start-up
48 d5 0…250 Minutes Defrost delay on start-up
49 d6 0...2 -- Display on hold during defrost
50 dd 0…15 Minutes Dripping time after defrost
51 d8 0…15 Hours Alarm bypass after defrost
52 d8d 0…250 Hours Alarm bypass after door open
53 d9 0/1 Flag Defrost priority over compressor protectors
54 d/1 - °C/°F Defrost probe 1 read
55 d/2 - °C/°F Defrost probe 1 read
56 dC 0/1 Flag Time base (0=h/m;1=m/s)
57 d10 0...250 Hours Compressor running time for defrost
58 d11 -20...20 °C/°F Running time temperature for defrost
59 d12 0...3 -- Advanced defrost
60 dn 1...100 % Nominal defrost duration
61 dH 0...100 -- Proportional factor, variation in dI
ALARM MANAGEMENT PARAMETERS
62 A0 0.1…20.0 °C/°F Alarm (fan) differential
63 A1 0/1 Flag Relative or Absolute Alarm
64 AL -50…200 °C/°F Low temperature alarm threshold
65 AH -50…200 °C/°F High temperature alarm threshold
66 Ad 0…250 Minutes Low and high temperature signal delay
67 A4 0…15 Flag Digital input 1 configuration
68 A5 0…15 Flag Digital input 1 configuration
69 A6 0…100 Minutes Stop compressor from external alarm
70 A7 0…250 Minutes External alarm detection delay
71 A8 0/1 Flag Enable alarms ‘Ed1’ and ‘Ed2’

Ver. 1.1 Pag.7/12

Eng
 Updated:
17/03/2010

N° Code Range U.M. Description

72 Ac 0...200 °C/°F High condenser temperature alarm
73 AE 0.1...20 °C/°F High condenser temperature alarm differential
74 Acd 0…250 Minutes High condenser temperature alarm delay
75 AF 0…250 Seconds Light sensor OFF time
76 ALF -50...200 °C/°F Antifreeze alarm threshold
77 AdF 0…15 Minutes Antifreeze alarm delay
78 ACS -50...200 °C/°F Alarm Clean Setpoint
79 ACd 0.1...50 Minutes Alarm Clean differential
EVAPORATOR FAN MANAGEMENT PARAMETERS
81 F0 0...2 Flag Fan management
82 F1 -50...200 °C/°F Fan stop temperature
83 F2 0/1 Flag Fan OFF with compressor OFF
84 F3 0/1 Flag Fans in defrost
85 Fd 0…15 Minutes Fan OFF after dripping
86 F4 -50...200 °C/°F Condenser fan stop temperature
87 F5 0.1...20 °C/°F Condenser fan start differential
GENERAL CONFIGURATION PARAMETERS
88 H0 0…207 -- Serial address
89 H1 0...10 Flag Function of relay 4
90 H2 0...6 Flag Disable keypad/IR
91 H4 0/1 Flag Disable buzzer
92 H6 0...255 -- Lock keypad
93 H8 0/1 Flag Select activation of output with time band
94 H9 0/1 Flag Enable set point variation with time band
95 Hdh -50...200 °C/°F Anti-sweat heater offset
96 CCd 0...999 -- Clean Counter Days
97 Cd 0...999 -- Clean days
98 SAn 0...255 -- Service Alarms number
99 SAr 0...1 Flag Service Alarms counter reset San
100 CAn 0...255 -- Clean Alarm counter
101 CAr 0...1 Flag Clean Alarm counter reset

NOTE 1:
Above operating parameters are available for all range of CAREL thermoregulators. Particularly all green
highlighted parameters are available on new CAREL controller ir33 IRELF0HN245, currently installed on HD
cabinets and counters

NOTE 2:
Blu highlighted operating parameters listed above are not influential for the functioning of the appliance.

Ver. 1.1 Pag.8/12

Eng
 Updated:
17/03/2010

SERVICE ALLARMS AND SIGNALS

SERVICE ALARMS SERVICE ALARMS DUE TO MALFUNCTIONING OR FAILURE PRODUCE A WARNING

SIGNALS ON THE DISPLAY BY MEAN OF THE SERVICE ICON

CAVITY PROBE In case of cavity probe faulty or malfunctioning display shows the error
FAULT signal rE and E0 (cavity probe S1 fault) alternately

The appliance works however and compressor starts are controlled by

time (15 mins is ON and 15 mins is OFF) until the fault is resolved. This
alarm signal is automatically restored when the faulty erased and the
probe replaced

During this time interval the service alarm icon flashes on display and an
acoustic signal is ENABLED

EVAPORATOR In case of evaporator probe faulty or malfunctioning display shows an

PROBE FAULTY error signal E1 (evaporator probe S2 fault).

This alarm signal is automatically restored when the faulty erased and
the probe replaced

During this time interval the service alarm icon flashes on display.
Acoustic signal is DISABLED

CONDENSER In case of condenser probe faulty or malfunctioning display shows the

PROBE FAULTY error signal SEr and E2 (condenser probe S3 fault) alternately
(WHEN INSTALLED
ON BOARD)

This alarm signal is automatically restored when the faulty erased and
the probe replaced

During this time interval the service alarm icon flashes on display.
Acoustic signal is DISABLED

CLEAN ALARM If a probe is set as the condenser probe, the condenser temperature can
be monitored to signal the high temperature alarm, due to obstruction or
fouling

In this case a warning signal is visualized and display shows the error
signal CLn and the temperature measured by the condenser probe
alternately

Service alarm icon is flashing and the acoustic signal DISABLED

The clean alarm is reset to zero by pressing the Prg/mute button and
the service alarm icon cancelled on display

Ver. 1.1 Pag.9/12

Eng
 Updated:
17/03/2010

TEMPERATURE ALARMS AND SIGNALS

TEMPERATURE HIGH OR LOW TEMPERATURE ALARMS DUE TO MALFUNCTIONING OR

ALARMS COMPONENTS FAILURE PRODUCE A WARNING SIGNALS ON THE
DISPLAY BY MEAN OF THE ALARM ICON.

LOW In case of low cavity temperature, referred to the cavity probe, the
TEMPERATURE display shows a flashing error code LO.
ALARM

Temperature alarm icon is flashing and the acoustic signal ACTIVE.

This alarm is automatically reset when cavity temperature increase over

the minimum temperature threshold, depending from the parameter AL

HIGH In case of high cavity temperature, referred to the cavity probe, the
TEMPERATURE display shows a flashing error code HI.
ALARM

Temperature alarm icon is flashing and the acoustic signal ACTIVE.

This alarm is automatically reset when cavity temperature decrease

under the maximum temperature threshold, depending from the
parameter AH

CONDENSER FAN In case of condenser fan faulty or malfunctioning display shows a

ALARM flashing error code SEr

Temperature alarm icon is flashing and the acoustic signal ACTIVE

Pressing Prg/mute button the buzzer is DISABLED but the alarm signal
is still active and shown on the display

Ver. 1.1 Pag.10/12

Eng
 Updated:
17/03/2010

CONNECTIONS

Follows all electrical connections available on ir33 CAREL controller , currently used in
production

IRELC0HN215 (646R05100) Æ installed on STD BEN and CL freezer counter and STD BEN
cabinet provided with internal light

IRELF0EN215 (646R04700) Æ installed on all STD BEN refrigerated counters, 400Lt

refrigerated cabinets and all STD BEN cabinets without light

Ver. 1.1 Pag.11/12

Eng
 Updated:
17/03/2010

IRELF0HN245 (646R09300) Æ installed on HD counters and cabinets

IRELF0EN225 Æ installed on digital ROLL–IN

IRELF0EHD15 Æ installed on 400Lt FREEZER cabinet

Ver. 1.1 Pag.12/12

Eng