Download User manual

μC3
1. Introduction
1.1
General description
The μC³ is a new compact CAREL electronic controller, measuring the size of a normal thermostat, for the complete management of chillers and heat pumps: it can
control air-air, air-water, water-water and condensing units.
Main functions
•
Temperature control for air/air units, air/water-cooled chillers/heat pumps, with two circuits and up to 6 steps, with and without reversal on the
water/refrigerant circuit;
•
condenser control in two circuits with up to 6 steps on air/water-cooled units, with and without reversal on the water/refrigerant circuit;
•
defrost management by time and/or by temperature or pressure;
•
fan speed control;
•
complete alarm management;
•
time band management;
Advanced functions
•
sliding defrost
•
functions to prevent high condensing pressure/temperature, low evaporator pressure/temperature, antifreeze
•
control
•
management of tandem, trio and semi-hermetic compressors
•
pump-down
•
part-winding start
Driver functions
•
Electronic expansion valve management.
Devices controlled
•
Compressor;
•
condenser fans;
•
evaporator fan (air-source units)
•
reversing valve;
•
water pumps for the evaporator and/or condenser (water-source units);
•
outlet fan (air-air);
•
antifreeze heater;
•
support heaters;
•
alarm signal device;
Programming
CAREL offers the possibility to configure all the unit parameters not only from the keypad on the front panel, but also using a hardware key or via a serial line.
1.2
User interface
pLD large terminal
The display has 4 digits plus decimal point. In normal operation, the value shown on the display corresponds to the temperature read by the control probe, for example
the evaporator water inlet temperature (on water chillers) or alternatively the room temperature, on direct expansion units.
Prg button: enters the parameters menu; if
already in the menu goes back one level at
a time until reaching the main screen
Amber LED
On = parameters menu
Off = other menu
Up button: enters the passwordprotected menu and scrolls the
parameters
Amber LED
On = pump on
Off = pump off
Flashing = pump alarm
Heat button: enters the parameters menu; if
already in the menu goes back one level at
a time until reaching the main screen
Green LED
On = parameters menu
Off = other menu
Alarm button: displays the alarm menu
Red LED
On = alarm active
Off = no alarm
On/off button: switches the
unit on/off
Red LED
On = unit on
Off = unit off
Cool button: activates HP mode
Green LED
On = HP mode
Off = chiller mode
Sel button: selects the chosen parameter
and confirms the changes
Green LED
On = main menu
Off = other menu
Down button: enters the password-protected menu
and scrolls the parameters
Green LED
On = compressors on
Off = compressors off
Flashing = compressor alarm
Fig. 1.a
+030220431 rel 1.5 16/11/2009
5