Carel µC2SE User Manual

38
1
2
C4
3
4
5
ON
OF
F
ON
OF
F
ON
OF
F
ON
OF
F
1
2
C5
3
4
5
ON
OF
F
ON
OF
F
ON
OF
F
ON
OF
F
t
t
1
3
C7
2
4
ON
OF
F
ON
OF
F
t
t
1
3
C8
2
4
ON
OFF
ON
OFF
ENGLISH
µC
2
SE - +030220426 - rel. 2.0 - 03.08.2009
- Start delay between compressors
c04: This sets the delay between the starts of the two compressors, so as to reduce the peak power input
and make the compressors start more smoothly. The compressor LED fl ashes in this phase.
In the event of capacity control, the delay c04 between compressor and valve becomes c04/2;•
In the event of defrost operation, the delay between compressor and compressor is 3 seconds, and •
between compressor and valve is 2 seconds.
Key:
1. 1
st
signal;
2. 2
nd
signal;
3. 1
st
compressore;
4. 2
nd
compressor;
5. time delay between two compressors ON routines/time-delay of the capacity-controlled routine.
- Stop delay between compressors
c05: This sets the stop delay between the compressors.
Key:
1. 2
nd
signal;
2. 1
st
signal;
3. 2
nd
compressor;
4. 1
st
compressore;
5. time delay between two compressors OFF routines/time-delay before the capacity-controlled routine.
- Delay on power-up (reset power supply)
c06: At power ON (when the controller is physically switched ON) the activation of all the outputs is delayed so
as to distribute the power input and protect the compressor against repeated starts in the event of frequent power
failures. This means that after the delay time, the controller will start to manage the outputs based on the other
times and the other normal functions.
- Compressor start delay from pump/outlet fan (air/air) ON.
c07: In cooling and heating operation, if the operation of the pump (outlet fan) is subject to the controller
(parameter H05=2), the compressor is started when required after the set time from the activation of the water
pump (or outlet fan in air/air units).
If the pump/outlet fan is always ON (H05=1) and consequently does not depend on the control logic, the
compressor is started after the set time from when the unit starts.
Key:
1. inlet fan;
2. pump;
3. compressor;
4. time-delay between pump-inlet fan and compressor.
- Pump/outlet fan (air/air) start delay from compressor OFF
c08: In cooling and heating operation, if the operation of the pump (outlet fan) is subject to the controller
(parameter H05=2), when the compressor is requested to stop, the control fi rst stops the compressor and the
pump (outlet fan).
If the pump/outlet fan is always ON (H05=1), it is only stopped in standby mode.
Key:
1. compressor;
2. pump;
3. inlet fan;
4. time-delay between pump-inlet fan and compressor.
- Maximum tandem compressor operating time
c09: In the case of two compressors in tandem per circuit, one compressor should not operate for longer than
the time set for c09 while the other compressor in the circuit is OFF. This prevents the oil shared in common
from migrating over the allowed limit towards the active compressor, and consequently avoids damage when
inactive compressor next starts (FIFO logic) due to poor lubrication. As a result, compressor 1 (or 2) in circuit 1, if
requested to operate continuously, will actually stop OFF after the time c09 and hand over to compressor 2 (or 1)
that was previously OFF.
This function always considers the compressor times. Any value lower than the time set for c03 will be ignored, and
the compressors (if the above condition is satisfi ed) will switch over after the time c03.
When C9=0, the function is disabled (the compressors will not switch over).
Fig. 5.a.f
Fig. 5.a.g
Fig. 5.a.h
Fig. 5.a.i

Carel µC2SE Specifications

General

Brand	Carel
Model	µC2SE
Category	Controller
Language	English