Carel uC2SE User Manual download pdf (Page 25)

F04

F05

F06

F09

F04

F08

F04

F03

F05

F07 F06

F04

F03

F08

F09 F10

100%

100 %

100%

1 1

2 2

ENGLISH

µC

SE process chiller +030220416 - rel. 1.1 - 27.04.2010

• 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.

Cooling ON/OFF Heating ON/OFF

Cooling with speed control Heating with speed control

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

SE.

If using FCS controllers, set this parameter to 0.

F03 = Represents the minimum threshold for the triac

- 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

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).

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