Carel ?C2SE User Manual page 38

1
2
3
4
C4
5
Fig. 5.a.f
1
2
3
4
C5
5
Fig. 5.a.g
1
2
3
C7
4
Fig. 5.a.h
1
2
3
C8
4
Fig. 5.a.i
- Start delay between compressors
ON
c04: This sets the delay between the starts of the two compressors, so as to reduce the peak
OFF power input and make the compressors start more smoothly. The compressor LED fl ashes in this
ON phase.
• In the event of capacity control, the delay c04 between compressor and valve becomes c04/2;
OFF
• In the event of defrost operation, the delay between compressor and compressor is 3 seconds,
ON
and between compressor and valve is 2 seconds.
OFF
ON Key:
1. 1 st signal;
OFF
2. 2nd signal;
3. 1 st compressore;
4. 2 nd compressor;
5. time delay between two compressors ON routines/time-delay of the capacity-controlled
routine.
ON
OFF
- Stop delay between compressors
ON
c05: This sets the stop delay between the compressors.
OFF
ON
Key:
nd
1. 2 signal;
OFF
2. 1st signal;
ON
nd
3. 2 compressor;
OFF
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.
ON
- Compressor start delay from pump/outlet fan (air/air) ON.
OFF
t
c07: In cooling and heating operation, if the operation of the pump (outlet fan) is subject to the
ON
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).
OFF
t
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;
ON
4. time-delay between pump-inlet fan and compressor.
OFF
t
- Pump/outlet fan (air/air) start delay from compressor OFF
ON
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
OFF
t
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).
38 μC 2 SE - +030220426 - rel. 2.1 - 09.06.2010