Carel plug-in User Manual

plug-in
Cod. +030221881 rel. 1.5 - 26/10/10
26
d9: defrost priority over compressor protection
Overrides the compressor protection times (c1: minimum time between 2 successive starts, c2: minimum off time and c3:
minimum on time) at the start of the defrost. The possible values are:
0 = the protection times are respected;
1 = the protection times are overridden; the defrost has priority and does not respect the compressor time settings.
It is useful, for example, with hot gas defrost to avoid delaying the defrost in the case where the compressor has just stopped and
there is a minimum time between two starts. Remember, however, that in this case the maximum number of activations per
hour of the compressor may not be respected.
Def.: d9=0 the defrost respects the compressor time settings (as default these are set to zero). For instruments with a serial number
less than 5000 d9=1 by default. Available on all models.
d/: defrost probe reading
Selecting this parameter displays the value read by the defrost probe for instruments where fitted. Once the parameter d/ has been
selected, the value of the temperature measured by the defrost probe can not be modified but only read. Available on models Y and
C.
dC: time basis
Modifies the unit of measure used to count the times for parameters dI (defrost interval) and dP (defrost duration). The possible
values are:
0 = dI expressed in hours and dP in minutes;
1 = dI expressed in minutes and dP in seconds.
Parameter dC=1 can be useful to test the operation of the defrost function with reduced times. Remember , however, that if the
defrost requires the compressor to be on (hot gas defrost) and parameter d9=1, the compressor risks being damaged due to
an excess of start-ups in a short time.
Parameter dC=1 is on the other hand very useful in the event where versions Y and X need to be used to manage air driers. The
defrost cycle thus becomes the condensation discharge cycle, which must occur at close intervals (minutes) and for very brief
durations (seconds).
Def.: dC=0, that is dI, defrost interval, in hours and dP, maximum defrost duration, in minutes. Available on all models.
4.8 A = alarm management parameters
alarm parameters type min max uom def
A0
alarm and fan differential (0= 0.5 °C / °F) C 0 +19 °C/°F 0
AL
low temperature relative alarm (difference from set) F 0 +127 °C/°F 0
AH
high temperature relative alarm (difference from set) F 0 +127 °C/°F 0
Ad
temperature alarm delay C 0 199 min 120
A4
multifunction input configuration C 0 5 - 0
A7 external alarm detection delay (A4=1, Multifunct. Input)
C 0 199 min 0
Tab. 4.8.1
A0: alarm and fan differential
Represents the differential used to activate the high and low temperature alarms (AL and AH) (see figure below) and fan
management (see parameters F). In the case of an alarm, as seen in the figure, the value of A0 determines the actual activation of
the temperature alarms.
Def.: 0 °C (equal to 0.5 °C). Available on all models.
ON ON
OFF OFF
Set Point
t
A0 A0
Allarme relativo bassa temperatura
low temperature relative alarm
allarme relativo alta temperatura
high temperature relative alar
m
A
L
A
H
Fig. 4.8.1

Carel plug-in Specifications

General

Brand	Carel
Model	plug-in
Category	Thermostat
Language	English