Defrost With 2 Evaporators; Second Compressor With Rotation - Carel ir33+ small wide User Manual

11.3 Defrost with 2 evaporators

Up to 3 defrost probes and up to 2 evaporator outputs can be confi gured.
The controller recognises the basic confi guration shown in the table
below (probe 1 is the control probe and cannot be confi gured).
DEFROST PROBE AND EVAPORATOR OUTPUT CONFIGURATION
Case Defrost probes Evaporator
outputs
1 Probe 2 Evap. 1
2 Probe 2 Evap. 1
and 2
3 Probe 2 Evap. 1
Probe 3
4 Probe 2 Evap. 1
Probe 3
Probe 4
5 Probe 2 Evap. 1
Probe 3 Evap. 2
6 Probe 2Probe 4 Evap. 1
Probe 3Probe 4 Evap. 2
Case 6 refers to the confi guration with 1 probe on each evaporator and
1 probe in common.
CASE 6: probe 2, probe 4 on evaporator 1, probe 3, probe 4 on
evaporator 2.
C
L
ir33+
F
S
S2
T V1
E1
S3
T
V2
E2
Fig. 11.a
Key
E1/2 Evaporator 1/2
C Condenser
V1/2 Electronic expansion valve 1/2
L Liquid receiver
V1/2 Thermostatic expansion valve 1/2
The following situations may occur if the outputs are not confi gured or
there are probe alarms.
Notes
Probe 2 acts on evap. 1
Probe 2 acts on evap. 1 and 2
Probes 2 and 3 act on evap. 1 (start
and end defrost refer to the probe
with the lower value)
Probes 2, 3, 4 act on evap. 1 (start and
end defrost refer to the probe with the
lower value)
Probe 1 acts on evap. 1
Probe 2 acts on evap. 2
Probe 2 and 4 act on evap. 1 (end de-
frost if all probes > end defrost thre-
shold.)
Probe 3 and 4 act on evap. 2 (end de-
frost if all probes > end defrost thre-
shold.)
Tab. 11.c
CMP
S4
S2/3/4 Defrost probe 2, 3, 4
CMP Compressor
F Filter-drier
S Liquid gauge
DEFROST BY TEMPERATURE
Defrost probe / evap. Situation
output confi g.
Probe 2 defrost output 1 No probe
Probe available, probe
error
Probe 3 No probe
AUX1 confi gured
defrost output 2
AUX2 confi gured
AUX1 and AUX2 not
confi gured
Probe available, probe
error
Probe available and
AUX1 and AUX2 not
confi gured
Probe 4 together with No probe, not managed Cases 4, 6 not reco-
probe 2 and probe
Probe available, probe
3defrost output 1 and
error
defrost output 2
DEFROST BY TIME
Defrost probe / Situation
evap. output confi g.
Defrost output 1 AUX1 confi gured
AUX2 confi gured
AUX1 and AUX2
not confi gured
Note: AUX1 and AUX 2 confi gured as evaporator outputs are not
equivalent..

11.4 Second compressor with rotation

Second compressor output with two step control and rotation. The
role of main and secondary compressor are alternated whenever the
compressor stops, so that when next called to start (or stop), the output
not involved in the previous start (stop) will be activated (deactivated).
Par. Description
H1/H5 AUX/AUX2 output confi guration
0 = normally energised alarm
...
13 = second compressor step with rotation
Sv
St+rd
St+rd/2
St
ON
CP1
OFF
ON
CP2
OFF
53
ENG
Eff ect
Defrost ends by timeout
(dP1)
Defrost ends by timeout
(dP1)
Defrost ends by timeout
(dP1)
Defrost ends by timeout
(dP2)
Not performed
Defrost ends by timeout
(dP2)
Defrost performed on
defrost output
gnised
Defrost ends by timeout
Tab. 11.d
Eff ect
Defrost ends by timeout (dP1)
Defrost ends by timeout (dP2)
Defrost not performed
Tab. 11.e
Def Min Max UoM
1/3 0 13
Tab. 11.f
t
t
t
Fig. 11.b
ir33plus +0300028EN rel. 1.1 - 05.05.2017
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