Carel µC2 User Manual

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E N G L I S H
µC
2
- +030220731 - rel. 1.2 - 26.10.2007
- 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 first 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.
• 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
(*) 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 configurations 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 first 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).
- Number of evaporators
H03: This establishes the number of evaporators present when there are 2 or 4 compressors, obviously
with 2 circuits (including the expansion). With one evaporator (H03=0), the management of the heaters
and the antifreeze function is performed only on B2. Vice-versa, with 2 evaporators (H03=1) antifreeze
control will be performed using B2 and B6, while input B5 is used to control the water outlet temperatu
-
re.
- Number of compressors/circuits
H04: This establishes the number of compressors per circuit and the number of circuits. For further
details see Table 4.g.
- Evaporator pump/fan operating mode
H05:
This establishes the operating mode for the evaporator water pump or the outlet fan (in air/air
units).
H05 = 0: pump disabled, (the flow switch alarm is ignored)
H05 = 1: always ON (the alarm is managed)
H05 = 2: ON when called by compressor (the alarm is managed)
H05 = 3: the pump will be started and stopped at regular intervals (independently from the compressors)
as per the Burst setting (see parameters c17 and c18). When the heating or cooling signal is received, first
the evaporator pump/outlet fan starts (always ON), and then the compressor, after the set times (c07,
c08). The pump will not be stopped until all the compressors are Off.
Note: with air/air units (H01=0,1), if heaters are used as the heating device, the fan must not be stopped
while heating is active. This would cause the risk of fire. Therefore, if H01=0 or 1, H05 must be set to 1.
- Cooling/heating digital input
H06: Establishes whether the cooling/heating selection from digital input is enabled. see parameters P08,
P09, P10, P11, P12 and P13). The open status places the unit in cooling operation, vice-versa, in heating.
D-IN Open = Cooling
D-IN Closed = Heating
- ON/OFF digital input
H07:
Establishes whether the ON/OFF selection from digital input is enabled or disabled. If the selection
is enabled (H07= 1), the “open” status switches the unit Off, while in the “closed” status, the unit may be
OFF or ON, as controlled by the keypad.
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Carel µC2 Specifications

General

Brand	Carel
Model	µC2
Category	Controller
Language	English