Carel uC2SE User Manual Download Page 44

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ENGLISH

μC

SE - +030220426 - rel. 2.1 - 09.06.2010

- Fan management mode in defrost
F13:

This parameter sets the operating logic for the condensing fans during the defrost phase:

F13 = 0: (default) the fans are OFF.
F13 = 1: the fans are ON as in cooling mode, based on the temperature or pressure.
F13 = 2: the fans are OFF until the end defrost temperature or pressure is reached, above which
they are started at maximum speed for the time set for parameter d16. Only at the end of this
time will the cycle return to heat pump mode with the normal management of the fans.

Note:

If the unit is running the Fan Defrost function (parameter d17), the fan management

selected by F13 is disabled.

- Fan on time when starting in high condensing temp.
F14:

establishes the time the fans are operated at maximum speed if starting with a high

condensing temperature.
F14 = 0: function disabled.
F14 > 0: fan on time (in seconds).
The function is operational only in chiller mode, if the probe on the condenser is a temperature
sensor and only for air-cooled units. When the fi rst compressor in the circuit in question starts, it is
assumed that the temperature of the environment is close to the temperature of the condenser; if
the value read by the condenser probe is higher than the value of F05-F07, as well as starting the
compressor, the fans in the circuit in question are forced on at maximum speed for the time set
by F14.

Activate low noise

F15:

This function moves the condensing pressure set point so as to lower the fan speed and

consequently reduce noise (specifi cally at night). If low noise is active in cooling, the condenser
control set points are increased by F16. If low noise is active in heating, the set points are reduced
by F17.
F15= 0: Low noise deactivated.
F15= 1: Low noise activated in cooling.
F15= 2: Low noise activated in heating.
F15= 3: Low noise activated in cooling and heating.

N.B.

The variation in the set point is not active during defrost

Cooling set point diff erential

F16:

Diff erential added to the condenser control set point when low noise is active (valid for both

temperature and pressure control).

Heating set point diff erential

F17:

Diff erential subtracted from the condenser control set point when low noise is active (valid

for both temperature and pressure control).

•

Unit settings: parameters: (H*)

- Unit model
H01:

Used to select the type of unit being controlled:

H01= 0: 0: air/air units
H01= 1: AIR/AIR heat pump
H01= 2: AIR/WATER Chiller
H01= 3: AIR/WATER heat pump
H01= 4:WATER/WATER Chiller
H01= 5: water/water heat pump with rev. on gas (*)
H01= 6: water/water heat pump with rev. on water (*)
H01= 7: air-cooled condensing unit
H01= 8: air-cooled condensing unit with reversal on gas circuit
H01= 9: water-cooled condensing unit
H01= 10: water-cooled unit condensing with reversal on gas circuit
H01= 11: cooling-only air-air unit with electric heating
(*)

Note:

Set H21= 4 (Condenser pump always on), if H02= 1 (Two condensers).

- Number of condenser fan circuits/water condensers
H02:

This establishes the number of fan circuits present in the confi gurations with two circuits.

With one fan circuit (H02=0) the unit may have 1 or 2 refrigerant circuits:
• with one refrigerant circuit, the fans are exclusively controlled based on the pressure or

temperature read by the sensor in the fi rst circuit;

• with two refrigerant circuits, the fans are controlled based on the higher temperature/pressure

of the two circuits. In heat pump mode, the output depends on the lower temperature or
pressure.
The output used is Y1. Vice-versa, with 2 ventilation circuits (H02=1) each PWM output is
independent and depends on its own condenser probe (B3 or B4 for circuit 1 and B7 or B8 for
circuit 2).