User manual

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ENGLISH
µC
2
SE process chiller +030220416 - rel. 1.1 - 27.04.2010
1. INTRODUCTION
1.1 General description
The μC
2
SE is a compact CAREL electronic controller, the same size as a normal
thermostat, for the complete management of process chillers: it can control air-water
and water-water.
1.1.1 Main functions
• control of the water inlet and evaporator outlet temperature;
• defrost management by time and/or by temperature or pressure;
• fan speed control;
• complete alarm management;
• connection to serial line for supervision/telemaintenance;
• elimination of the expansion vessel.
- Driver function
• Management of electronic expansion valves.
1.1.2 Controlled devices
• compressor;
• condenser fans;
• water pumps for evaporator and/or condenser;
• antifreeze heater;
• alarm signal device.
1.1.3 Programming
CAREL o ers the possibility to con gure all the unit parameters not only from the
keypad on the front panel, but also using:
• a hardware key;
• a serial line.
1.2 User interface
1.2.1 Display
The display features 3 digits, with the display of the decimal point between -99.9 and
99.9.
Outside of this range of measurement, the value is automatically displayed without the
decimal (even if internally the unit still operates considering the decimal part).
In normal operation, the value displayed corresponds to the temperature read by probe
B1, that is, the evaporator water inlet temperature.
Fig. 1.a show the symbols present on the display and on the keypad and their meanings.
1.2.2 Symbols on the display
Display with 3 green digits (plus sign and decimal point), amber symbols and red alarm
symbols.
symbol colour meaning reference
refrigerant
circuit
with LED ON with LED fl ashing
1; 2 amber compressor 1 and/or 2 ON start up request 1
1; 3 amber compressor 3 and/or 3 ON start up request 2
A amber at least one compressor ON 1/2
B amber pump ON start up request 1/2
C amber condenser fan ON 1/2
D amber defrost active defrost request 1/2
E amber heater ON 1/2
F red alarm active 1/2
G amber heat pump mode heat pump mode request 1/2
H amber chiller mode chiller mode request 1/2
Table 1.a
Fig. 1.a