Carel µC2SE User Manual page 44

- 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 differential
F16: Differential added to the condenser control set point when low noise is active (valid for both
temperature and pressure control).
- Heating set point differential
F17: Differential 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).
44 µC 2 SE - +030220426 - rel. 2.0 - 03.08.2009