Carel µC2 User Manual

44
E N G L I S H
µC
2
- +030220731 - rel. 1.2 - 26.10.2007
- Select digital input ID1
P08= 0: none;
P08= 1: flow switch with manual reset (normally closed);
P08= 2: flow switch with automatic reset (N.C.);
P08= 3: general thermal overload with manual reset (N.C.);
P08= 4: general thermal overload with automatic reset (N.C.);
P08= 5: thermal overload circuit 1 with manual reset (N.C.);
P08= 6: thermal overload circuit 1 with automatic reset (N.C.);
P08= 7: thermal overload circuit 2 with manual reset (N.C.);
P08= 8: thermal overload circuit 2 with automatic reset (N.C.);
P08= 9: cooling/heating (open = Cooling, closed = Heating) if H06= 1;
P08= 10: cooling/heating with delays d12 and d13 (open = Cooling, closed = Heating) if H06= 1;
P08= 11: alarm signal with manual reset (N.C.);
P08= 12: alarm signal with automatic reset (N.C.);
P08= 13: second set point from external contact (cooling and heating), (normally open);
P08= 14: second cooling set point from external contact and heating from time band (N.O.);
P08= 15: end defrost from external contact circuit 1 (N.C.);
P08= 16: end defrost from external contact circuit 2 (N.C.);
P08= 17: end defrost from external contact circuit 1 (N.C.);
P08= 18: end defrost from external contact circuit 2 (N.C.);
P08= 19: condenser step 1 (N.O.);
P08= 20: condenser step 2 (N.O.);
P08= 21: condenser step 3 (N.O.);
P08= 22: condenser step 4 (N.O.);
note 1: if P08 is set to 10, the change in state considers the times d12 and d13, and respects the compres-
sor protection times, both from the digital input and the keypad.
note 2: if the digital input is used to switch the unit ON/OFF or change the operating mode, these
functions are disabled on the keypad.
- Select digital inputs ID2,ID6,ID7,ID10
P09, P10, P11, P12: Configuration of digital inputs ID2, ID6, ID7 and ID10 respectively (as per the above
table for digital input ID1).
Nota: cooling/heating (9,10) cannot be set on P10, P11, P12, and P14.
- Select input B4 if /04 = 1
P13: If input B4 is used as ON/OFF (/04 = 1) the same options are valid as for P08.
- Select input B8 if /08 = 1
P14: If input B8 is used as ON/OFF (/08 = 1) the same options are valid as for P08.
- Select low pressure alarm
P15: Used to select whether the low pressure alarm is detected when the compressor is OFF (P15=1) or
alternatively only when the compressor is ON (P15=0, default).
When the compressor starts the alarm is in any case ignored for the time P03.
- High temperature/high system start-up temperature alarm delay
P16: Represents the high temperature alarm threshold detected by probe B1; the differential is set at 2 °C
and the alarm is reset automatically (the warning relay is activated, signal only, and the message “Ht” is
shown).
When starting the system, this alarm is ignored for the time P17. If the system start-up protection is
enabled (see parameter P20) and the alarm is activated, the time P17 is ignored and the alarm has no
hysteresis.
- High temperature alarm delay on power-up
P17: High temperature alarm delay when the control is switched on (power ON), from the remote
ON/OFF contact or from the keypad.
- High pressure alarm from transducer set point
P18: Sets the value beyond which the high pressure alarm is generated. Each circuit will be managed by
its own transducer.
P18= 0: the function is disabled.
For all other values greater than 3.0, due to the hysteresis (3 bars), the alarm is managed according to the
set value.
- Low system start-up temperature alarm set point
P19: Represents a threshold for the low temperature (measured by probe B1) alarm, without hysteresis; it
is reset automatically (the alarm relay is not activated and the display shows the message “ALt”).
- System start-up protection for high/low temperature
P20: If set to 1, this parameter enables the system protection function when starting, both at power ON
and when switching ON from Standby.
In chiller mode (cooling), for values of B1 greater than the set point P19, an alarm is activated and the
unit is not started (display “AHt”).
In heat pump mode (heating), for values lower than the set point P19, an alarm is activated and the unit
is not started (display “ALt”).
The alarm is reset automatically.
P20=0: the function is not enabled.

Carel µC2 Specifications

General

Brand	Carel
Model	µC2
Category	Controller
Language	English