Carel ir33+ small wide User Manual page 26

ENG
Case 1: light off when opening the door
If the door is opened with the light OFF:
•
the compressor and the evaporator fans are switched off ;
•
the light is switched on (only on models fi tted with at least 1 auxiliary
relay programmed as a light output);
•
the reading displayed and the icon
•
the temperature alarms are disabled.
If the door remains open for a time longer than "d8" (d8d), the controller
resumes normal operation:
•
the compressor and the evaporator fan are switched on, if needed;
•
the light is switched off ;
•
the reading on the display fl ashes;
•
the buzzer and the alarm relay are activated;
•
the temperature alarms are enabled with the delay "Ad".
To stop the reading from fl ashing, close the door. When the door closes,
the controller resumes normal operation, switching off the light and
enabling the temperature alarm after the delay time "d8". The compressor
is re-started, after any set protection times (see the "C" parameters).
Case 2: light on when opening the door
The icon is on. If the door is open with the light on, it is assumed the
user enters the cold room, turning on the light before entering, closing
the door behind him, and then exits the room, closing the door a second
time.
When the door is opened the fi rst time:
•
the compressor and the evaporator fans are switched off ;
•
the light stays on (only on models fi tted with at least 1 auxiliary relay
programmed as a light output);
•
the reading is displayed and the
•
the temperature alarms are disabled.
When the door is closed the fi rst time, the controller maintains the
previous situation:
•
the compressor and the evaporator fans stay off ;
•
the light stays on;
•
the reading is displayed and the
•
the temperature alarms are disabled.
Door opened the second time: no change.
When the door is closed the second time, the controller resumes
normal operation, switching off the light and enabling the temperature
alarm after the delay time "d8". When the compressor re-starts, any set
protection times must elapse fi rst (see the "C" parameters).
If, after opening, the door remains open for a time longer than "d8" or
"d8d", the controller resumes normal operation:
•
compressor and evaporator fan switched on if needed;
•
light off ;
•
the reading on the display fl ashes;
•
the buzzer and the alarm relay are activated;
•
the temperature alarms are enabled with the delay "Ad";
•
when the door closes, the high temperature alarm bypass time after
door open d8 is not set.
To stop the reading from fl ashing, close the door.
If, after being closed for the fi rst time, the door remains closed for longer
than time "d8" or "d8d", the controller resumes normal operation:
•
compressor and evaporator fan switched on if needed;
•
light off ;
•
the temperature alarms are enabled with the delay "d8";
•
the high temperature alarm bypass time after door open d8 is set.
If, after the door is closed for the fi rst time, the light is switched off
manually, the controller resumes normal operation:
•
compressor and evaporator fan switched on if needed;
•
light off ;
•
the temperature alarms are enabled with the delay "d8";
•
the high temperature alarm bypass time after door open d8 is set.
ir33plus +0300028EN rel. 1.1 - 05.05.2017
fl ash;
icon fl ashes;
icon fl ashes;
Note:
•
if the light was previously switched on manually, when the door is
closed for the second time, it is automatically switched off ;
•
even if the evaporator fan is managed by the "fan controller" (see the F
parameters), the fans are forced to stop when the door is open.
This algorithm resolves any problems relating to faults or malfunctions of
the door switch.
Door-switch
Note: if more than one digital input is confi gured as a door switch,
the door is considered open when at least one of the inputs is open.
6 = Remote On/Off
The digital input may be programmed also as remote ON/OFF. When the
control is in OFF:
•
the temperature is displayed alternating with the message "OFF";
•
the internal timer for parameter "dI" is updated. If "dI" expires when the
unit is OFF, a defrost is performed when the unit is switched on again;
•
the auxiliary relay set as auxiliary and light output is active, the other
auxiliary outputs are off ;
•
the buzzer and the alarm relay are deactivated;
•
the controller does not perform the control functions, defrosts,
continuous cycle, signal temperature alarms and all other functions;
•
the compressor protection times are observed;
When the controller is switched back on, all the functions are re-activated,
with the exception of:
•
defrost on start-up;
•
compressor and fan delay at power on.
Note: the ON/OFF from external digital input has priority over the
keypad and the supervisor;
7 = Curtain switch
If the input is selected as a curtain switch, the controller modifi es the
set point when the contact closes, adding the value of parameter "r4";
the new value is then used for all the functions relating to the set point
(e.g. relative high and low temperature alarms, control with dead band,
control with two compressor steps etc.). For example when "r4"=3.0
(default value), the set point is increased by 3 degrees from the value
used when the curtain is open.
Par. Description
r4 Automatic night-time set point variation
CMP/FAN
DI OPEN
ON
OFF
rd
St
DIRECT
26
Fig. 5.c
Def Min Max UOM
3 -20 20
CMP/FAN
ON
OFF
Sv
r4
rd
St
Fig. 5.d
°C/°F
Tab. 5.g
DI CLOSED
Sv