00%
0%
100 %
0%
0%
100%
11
11
3
22
22
3
ENGLISH
µC
2
SE - +030220426 - rel. 2.0 - 03.08.2009
- Max outside temperature threshold for sliding defrost
d18: This establishes the maximum value of the outside temperature below which sliding defrost is
activated.
- Maximum temperature/pressure differential deviation for defrost
d19: This value is expressed in °C if the compensation is controlled by temperature, or in bar if controlled
by pressure. The value set is subtracted from d03.
- Outside temperature differential for compensation saturation
d20: The value set is subtracted for d18.
• 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 temperature/
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.l
Fig. 5.a.m
Key:
1. speed %;
2. condensing temperature/pressure;
3. hysteresis.
F02=3: ON when the corresponding compressor is ON, with speed control. When the compressors are
stopped the corresponding fans are also stopped, irrespective of the condensing temperature/pressure.
With F02=3 and an NTC condenser probe, when the compressor starts the fans are started at maximum
speed for the time F11, irrespective of the temperature measured.
In the event of a condenser probe fault, the fans will be switched OFF.
- Minimum voltage threshold for Triac
F03: In the event of fan speed control, the optional phase cutting cards (MCHRTF*) are required, fi tted
with a triac. The voltage delivered by the triac to the electric fan motor corresponding to the minimum
speed must be set. The set value does not correspond to the actual voltage in Volts applied, but rather to
an internal unit of calculation in the µC
2
SE.
If using FCS controllers, set this parameter to 0.
F03 = Represents the minimum threshold for the triac
Cooling ON/OFF Heating ON/OFF
Cooling with speed control Heating with speed control
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