Carel ?C2SE User Manual

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SE - +030220426 - rel. 2.1 - 09.06.2010
- Type of defrost
d02: establishes the type of defrost.
d02=0: the defrost has a  xed duration that depends on d07
d02=1: the defrost starts and ends according to the temperature or pressure thresholds, see d03
and d04;
d02=2: the pressure transducer and temperature probe are both located on the outside
exchanger; the defrost starts when the value read by the pressure transducer is below the
threshold d03 and ends when the value read by the temperature probe is above the threshold
d04; during the defrost, the pressure probe controls the fan speed, as in chiller mode, so as to limit
the pressure, even if the NTC probe, caked by ice, delays the end defrost. In any case, after the
maximum time allowed for the defrost, the unit will always exit the defrost procedure.
d02=3: enable sliding defrost.
In the event of low outside temperatures, the evaporator pressure or temperature may fall below
the threshold set to start the defrost (d03) even if there is e ectively no ice on the coil. This can
be corrected by shifting the start of the defrost proportionally to the lowering of the outside
temperature. This procedure can be performed based on the temperature or the pressure alone,
and not combined. It is disabled if the outside compensation probe is not  tted or is broken. It
is performed based on the pressure only if both the pressure probe and temperature probe are
con gured.
- Start defrost temperature/pressure or condenser antifreeze alarm set point
d03: For heat pumps with air-cooled condensers (H01=1, 3, 8, 10, 12), this sets the temperature
or pressure below which the defrost cycle starts. To start the defrost cycle, the condition must be
valid for the time d05. For water/water heat pumps with reversal on the gas circuit (H01=5, 10), it
de nes the set point for the activation of the antifreeze alarm for the outdoor exchanger cooling
water (evaporator in heating mode, on probe B3).
If sliding is defrost enabled, the start defrost temperature decreases (starting from d03)
proportionally to the outside temperature.
- End defrost temperature/pressure
d04: Establishes the temperature or pressure above which the defrost cycle ends.
- Minimum start defrost time
d05: Establishes the time that temperature/pressure must remain below the start defrost
threshold d03, while the compressor is ON, for the defrost cycle to be activated.
Key:
1. end defrost T/P ;
2. start defrostT/P;
3. start defrostT;
4. end defrost;
5. min. time-interval to start a def. cycle (d6);
6. min defrost interval (d5);
7. timer reset.
- Minimum defrost duration
d06: Represents the minimum duration of the defrost cycle (the defrost continues even if the
value read by the condenser probe exceeds the end temperature/pressure). If set to 0, the
minimum defrost time function is disabled.
d06=0: control disabled.
- Maximum defrost duration
d07: If timed defrost is set (d02=0), this establishes the duration of the cycle.
If, on the other hand, the defrost ends at a set temperature/pressure, it represents the maximum
duration (being in this case a safety feature, an alarm is signalled, “dF1” or “dF2”).
- Delay between two defrost requests in the same circuit
d08: Represents the minimum delay between two successive defrost cycles.
- Defrost delay between the 2 circuits
d09: Represents the minimum delay between the defrost cycles on the 2 circuits.
- Defrost management from external contact
d10: This enables or disables defrost control from an external contact.
This function is typically used to end the defrost based on a signal from a thermostat/pressure
switch connected to the corresponding digital input. In this case, the defrost times are ignored.
d10 = 0: function disabled.
Note: for the other settings, the start and end defrost are enabled for temperature and pressure
values between the Defrost start and end set points
d10= 1: start defrost from external contact enabled therefore:
• if the contact of the input is open, the start of the defrost is enabled;
• if the contact of the input closed, the defrost follows the normal procedure.
Fig. 5.a.k
Defrost by temperature (d2= 1)

Carel ?C2SE Specifications

General

Brand	Carel
Model	?C2SE
Category	Control Unit
Language	English