Carel IR32C User Manual

Cod. +030220151 - Rel. 2.1 - 04/09/98
20
c3: Minimum compressor operating time: this sets the shortest period for which the compressor may
operate. The compressor will not be switched off if it has not been active for a time equivalent to the minimum
selected.
Default: C3=0 (No minimum operating period has
been set).
Available on IR32S, IRDRSE/S0, IR32Y, IR32P,
IR32C and IRDRC
c4: Duty setting or safety relay: if the Control sensor alarm is activated, (or if the ambient sensor is
short-circuited or disconnected), this parameter allows the compressor to function while the fault is being
repaired. As the compressor is unable to function on the basis of temperature (because of the faulty sensor),
it is activated cyclically with an operating time ("ON time") in minutes equivalent to the value assigned to c4
and a fixed OFF time of 15 minutes. There are two values of c4 which produce particular functioning. If
c4=0, the compressor will remain permanently OFF in case of a defective sensor; if c4=100, the compressor
will remain permanently ON, the 15 minutes off-time being cancelled. The following particular situations should
also be considered:
• If the control sensor fault occurs while the compressor is OFF, the compressor will start up (subject to
limits imposed by parameters c1 and c2) and remains ON for the period set by c4. At this point the "duty
setting" begins. This mode is indicated by the "COMP" LED which flashes during the compressor's off-time
and
stays permanently lit when the compressor is operating. The fans continue to operate according to the
chosen parameters (see category F).
• If the sensor defect alarm is signalled while the compressor is operating, the compressor is switched off
(without regard to the minimum operating time which may have been selected under parameter c3), and
remains off for 15 minutes; (the "COMP" LED flashes during this phase). After this, periodic operation
commences according to the operating time set under c4.
• If the sensor defect alarm is signalled while the equipment is defrosting or in continuous cycle, control
immediately leaves the state in which it happens to be and initiates the duty setting. To re-start
defrosting
or continuous cycle operation it is necessary to replace the ambient sensor. Since it is not possible to
effect defrosting by manual means, a replacement sensor should be available in case of any
malfunction.
If the sensor fault disappears, the equipment will return to normal operation. If at the moment of
disappearance the compressor is operating, it will continue for a period equivalent to the value of c3; if it
is off, it will remain off for a period equivalent to the value of c2
Default: 0 (Compressor always off in case of
defective ambient sensor.)
Available on IR32S, IRDRSE/S0, IR32Y, IR32P,
IR32C and IRDRC.
cc: Duration of the continuous cycle: it is the period in hours for which the compressor remains in
operation so as to lower the temperature even below the setpoint. If cc=0, the continuous cycle is not
activated. Control leaves continuous cycle mode when the period set under parameter cc has elapsed, or
when the minimum temperature set has been reached (see minimum temperature alarm, parameter AL).
Default: 4 (hours). Available on IR32S, IRDRSE/S0, IR32Y, IR32P, IR32C and IRDRC. Parameter with direct
access from remote control.
c6: Alarm cut-out after continuous cycle operation: the time in hours for which the temperature alarm
is de-activated after continuous cycle operation. If the temperature of the refrigerated unit should drop, after
continuous cycle operation, to a level below the minimum temperature (setpoint AL), the activation of the low
temperature alarm is delayed for the period set under parameter c6. It should be remembered that at that
temperature (setpoint AL), the continuous cycle is automatically de-activated. Default: 2 (hours). Available on
IR32S, IRDRSE/S0, IR32Y, IR32P, IR32C and IRDRC.

Carel IR32C Specifications

General

Brand	Carel
Model	IR32C
Category	Controller
Language	English