E N G L I S H
µC
2
- +030220731 - rel. 1.2 - 26.10.2007
- Start defrost with 2 circuits
d15: This parameter is used to select whether to defrost the two circuits together or separately.
d15 = 0 (default): the two circuits start defrosting independently (each according to their own temperatu-
re or pressure probe reading), only if H2=1;
d15 = 1: the two circuits start defrosting when both have reached the start defrost conditions;
d15 = 2: the two circuits start defrosting when at least one of the two has reached the defrost conditions.
d14= 0 d14= 1 d14= 2
d15= 0 OK OK OK
d15= 1 OK OK OK
d15= 2 Not possible OK Not possible
Tab 5.b
- Forced ventilation time at end defrost
d16: If the parameter F13 = 2, as soon as the end defrost temperature or pressure is reached, the fans are
activated at maximum speed for the set time, before the change in operating mode.
Only at the end of this time will the cycle switch back to heat pump mode, with the normal management
of the fans.
- Defrost with compressors OFF (Fan Defrost)
d17: This function allows the outside temperature to be exploited, when sufficient, to defrost the conden-
ser (outdoor evaporator).
In these conditions, the unit, rather than reverse the cycle, simply turns OFF the compressors and activa-
tes the fans at maximum speed.
The start and end defrost conditions remain unchanged, as does the use of any auxiliary heaters.
The parameter has the following settings: d17=0: function disabled, d17>0: function enabled with relative
set point (which represents the minimum defrost temperature set by the manufacturer). Above the set
point, the unit performs the Fan Defrost.
• Fan settings: parameters (F*)
- Fan output
F01: Enables the operation of the fans.
F01=0: fans absent;
F01=1: fans present.
The PWM output (1 or 2, depending on the value of parameter H02) requires the presence of the optional fan
control cards (ON/OFF for the CONVONOFF module or speed variation for MCHRTF or FCS three-phase).
- Fan operating mode
F02:
This establishes the operating logic for the fans:
F02=0: always ON at maximum speed, independently from the compressors. The fans are only switched
OFF when the unit is in standby.
F02=1: ON at maximum speed when at least one compressor in the corresponding circuit is ON (parallel
operation in each circuit).
F02=2: ON when the corresponding compressor is ON, with ON/OFF control based on the temperatu-
re/pressure settings for the minimum and maximum speed (parameters F05-F06-F08 and F09). When
the compressors are stopped, the corresponding fans are also stopped, irrespective of the condensing
temperature/pressure.
Fig. 5.a.k
Cooling ON/OFF
Fig. 5.a.l
Heating ON/OFF
Key:
1. speed %;
2. condensing temperature/pressure;
3. hysteresis.
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