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32
ENG
ir0300028EN rel. 1.1 - 05.05.2017
6.8 Light and Aux outputs
If AUX1 or AUX2 is confi gured as a light or auxiliary output at power on,
the output retains the same status as when previously powered down.
The light or AUX output can be activated by the scheduler: this is set
using parameter H8. For the on/off day and time settings, see chapter 3.
Par. Description Def Min Max UOM
H8 Output switched with scheduler
0 = Light; 1= AUX 0 0 1 -
H9 Set point variation with scheduler
0/1 = no/yes 0 0 1 -
St Set point 0.0 r1 r2 °C/°F
r4 Automatic night-time set point variation 3.0 -20 20 °C/°F
ton Light/aux on time - - - -
toF Light/aux off time - - - -
Tab. 6.h
t
SET
CMP,
FAN
ON
OFF
ton toF
St+rd
St + r4
Sv
H9=1
Fig. 6.l
Key
CMP,
FAN Compressor, fan r4 Automatic night-time set point
variation
St Set point Sv Virtual probe
ton Light/aux on time toF Light/aux off time
t Time
6.9 Defrost
Introduction
Parameters td1 to td8 can be used to set up to 8 defrost events, managed
by the controller’s clock (RTC).
Press Set to set the sub-parameters, as shown in the table:
Par. Description Def Min Max UOM
td1…8 Defrost 1 to 8 (press Set) - - - -
d__ Defrost 1 to 8 – day 0 0 11 day
h__ Defrost 1 to 8 – hour 0 0 23 hour
n__ Defrost 1 to 8 – minute 0 0 59 minute
Tab. 6.i
Remember that sub-parameter “d_” of td1(td2) defi nes the defrost day
as follows:
d_ = Defrost– day
0 = event disabled
9 = Monday to Saturday
1…7 = Monday to Sunday 10 = Saturday & Sunday
8 = Monday to Friday 11 = every day
ir33+ can manage the following types of defrost, based on the setting of
parameter d0:
0. heater (located near the evaporator) by temperature;
1. hot gas by temperature;
2. heater by time;
3. hot gas by time;
4. heater by time with temperature control.
The defrost can end by temperature, in which case the defrost probe
Sd must be installed, or by time. In the fi rst case, the defrost ends when
the defrost probe Sd exceeds the end defrost value dt1 or the time dP1
has elapsed, in the second case when the defrost procedure exceeds
the maximum time dP1. At the end of the defrost, the dripping stage
may begin (if dd>0), during which the compressor and the fans are
off , followed by the post-dripping stage (if Fd>0), during which control
resumes with the fans off . The type of display on user terminal and the
remote display during the defrost can be selected by setting parameter
d6.
Par. Description Def Min Max UOM
d0 Type of defrost 0 0 4 -
0 = Heater by temperature
1 = Hot gas by temperature
2 = Heater by time (Ed1, Ed2 not shown)
3 = Hot gas by time (Ed1, Ed2 not shown)
4 = Heater by time with temperature control
(Ed1, Ed2 not shown)
dt1 End defrost temperature probe 2 4 -5 200 °C/°F
dt2 End defrost temperature probe 3 (aux eva-
porator)
4 -5 200 °C/°F
dt3 End defrost temperature probe 4 4 -5 200 °C/°F
dP1 Maximum defrost duration 30 1 250 min/s
dP2 Maximum aux evaporator defrost duration 30 1 250 min/s
d6 Terminal display during defrost
0 = Temperature alternating with dEF
1 = Display disabled
2 = dEF 1 0 2 -
Tab. 6.j
Note: dt3 is as masked parameter, and can be made visible using
the VPM tool.
ON
OFF
DEF
t
t
dt1
dP1
Sd
d0 = 0, 1
t
t
d0 = 2, 3
d0 = 4
ON
OFF
DEF
ON
OFF
DEF
Fig. 6.m
Key
t Time Sd Defrost probe
dt1 End defrost temperature
probe 2 d0 Type of defrost
dP1 Maximum defrost duration DEF Defrost
Heater defrost by time with temperature control (d0=4) is used to
activate the defrost output only if the evaporator temperature (Sd) is less
than value of the parameter dt1, and ends after the time defi ned by dP1.
This function is useful for energy saving.