Cod. +030220151 - Rel. 2.1 - 04/09/98
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Interval between 2 defrosting. For all the models except IR32M
The defrost duration does not affect the interval between two defrosts. In fact the defrost interval is
calculated starting from the beginning of the defrost cycle (so, not from the end of the cycle, as in the
previous series).
Curtain-switch control. For all the models excepted IR32M
The digital input of the instrument can be programmed to control the ‘curtain -switch’. When the curtain is
closed – and consequently the digital input connected to the ‘curtain -switch’ is closed – the control increases
automatically the set-point of a selectable value. If the auxiliary output (AUX) controls the unit light, the light
is automatically switched off when the curtain is closed and switched on when it is open.
Description of the new parameters Type Min Max U.M. Def
r4 Automatic variation of the set-point during the night (or when
the Curtain-switch is closed, with A4 or A5=7)
C 0 +20 °C/°F 3.0
A4 Configuration of the digital input No 1 C 0 7 - 0
A5 Configuration of the digital input No. 2 (only IRDR* models) C 0 7 - 0
Management of the evaporator fans. IR32C, IR32P e IRDRC models
During the normal functioning, the controls of the Infrared series can control the evaporator fans as follows:
3 continuously;
3 only when the compressor is active;
3 according to the temperature difference between the evaporator and the ambient temperature.
Now a new option is available: the evaporator fans can be driven also according to the absolute temperature
of the evaporator. The F3 parameter is now fully operative.
Description of the new parameters Type Min Max U.M. Def
F0 Management of fans: 0 = fans always ON – specific phases
excluded (see F2, F3 and Fd parameters)
1= thermostatic fans on the basis of the difference between
ambient and evaporator temperature,
2= thermostatic fans according to the evaporator temperature
C 0 2 flag 0
F1 Starting temperature of the fans: if F0=1 the fans are ON if
evaporator temperature<(ambient temperature - F1 - A0); the fans
are OFF if evaporator temperature>ambient temperature - F1. if
F0=2, the fans are ON if evaporator temperature<(Setpoint + F1-
A0); the fans are OFF if evaporator temperature>(Setpoint + F1)
F 0 +20 °C/°F 5
Management of the new algorithm ‘switch door’. For all the models excepted IR32M
When the door is open:
3 the light is open (only IR32C and IRDRC models with an AUX output programmed to control the
management of light);
3 the compressor is OFF and the evaporator fans are OFF;
3 the measure displayed flashes;
3 the temperature alarms are disabled.
After a selectable time (d8) has elapsed, the controller returns to its normal functioning, and the temperature
alarms are activated. The new algorithm solves any problem due to a switch-door malfunctioning.
Description of the new parameters Type Min Max U.M. Def
A4 Digital input configuration No. 1 C 0 7 - 0
A5 Digital input configuration No. 2 (only IRDR* models) C 0 7 - 0
H1 Selection functioning of the relay 4: 0=auxiliary output, 1=alarm
normally closed, 2= alarm normally energized
C 0 1 flag 0
d8 If A4 or A5=5, max. stop time of the unit with door open.
Furthermore time to exclude the alarm after the defrost.
F 0 15 hours 1
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