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ENGLISH
μC 2 SE - +030220426 - rel. 2.1 - 09.06.2010
- Maximum voltage threshold for Triac
F04:
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 maximum 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 100.
F04 = Represents the maximum threshold for the triac
- Temperature/pressure set point for minimum speed in cooling
F05:
This represents the temperature or pressure below which the fans remain ON at minimum
speed. In the case of ON/OFF control, it represents the temperature or pressure below which the
fans are switched OFF (Fig. 5.a.k).
- Temperature/pressure diff erential for maximum speed in cooling
F06:
This represents the temperature or pressure diff erential in reference to F05 above which the
fans are started at maximum speed; in the case of ON/OFF control, this represents the diff erential
above which the fans are started (Fig. 5.a.k).
- Temperature/pressure diff erential for fans Off in cooling
F07:
This represents the temperature or pressure diff erential in reference to F05 below which the
fans are stopped. The fans are started 1 °C “lower” when using NTC temperature probes, or 0. 5
bars if using pressure probes. (Fig. 5.a.l)
If NTC temperature probes or pressure probes are used to control the condensing temperature/
pressure, there is an activation hysteresis of 1 °C or 0.5 bar respectively.
- Temperature/pressure set point for minimum speed in heating
F08:
This represents the temperature or pressure above which the fans are started at minimum
speed (Fig 5.a.n).
For ON/OFF control, this represents the temperature or the pressure above which the fans are
switched off (Fig 5.a.l).
- Temperature/pressure diff erential for maximum speed in heating)
F09:
This represents the temperature or pressure above which the fans are started at minimum
speed (Fig 5.a.l).
In the case of ON/OFF control, it represents the temperature or pressure above which the fans are
switched OFF (Fig.5.a.k). For capacity control for low pressure this represents, subtracted from F08,
the pressure limit below which the step disabled during capacity control is re-activated.
- Temperature/pressure diff erential for fans Off in heating
F10:
If fan speed control is used, this represents the temperature or pressure diff erential in
reference to F08 above which the fans are stopped. The fans are started 1 °C “lower” if using NTC
temperature probes or 0. 5 bars lower if using pressure probes.
When using NTC temperature or pressure probes for condenser control, the fans are started with
an hysteresis of 1 ºC or 0. 5 bar.
- Fan start time
F11:
This establishes the operating time at maximum speed when the fans are started, so as to
overcome the mechanical inertia of the motor.
The same times are observed in reference to the start of the compressor (irrespective of the
condensing temperature/pressure), if NTC temperature probes are used on the condenser and
speed control is enabled, F02=3; this is done to bring forward the sudden increase in pressure
(which does not necessarily correspond to a likewise rapid increase in temperature in the area
where the probe is located) and consequently to improve control
F11=0: the function is disabled, that is, the fans are activated at the minimum speed and then
controlled based on the condensing temperature/pressure.
- Triac impulse duration
F12:
This represents the duration in milliseconds for the impulse applied to the triac. For induction
motors, set the parameter to 2 (default). On the other hand, when using the CONVONOFF0,
CONV0/10A0 modules or FCS controllers, set the parameter to 0.