Carel µC2 User Manual

65
E N G L I S H
µC
2
- +030220731 - rel. 1.2 - 26.10.2007
WARNINGS
If one transform. is used to supply both the µC2 and the accessories, all the G0 terminals on the va-
rious controllers or the various boards must be connected to the same terminal on the secondary, and
all the G terminals to the other terminal on the secondary, so as to avoid damaging the instrument;
For use in residential environments, use shielded cable (2 wires + shield connected to heart both sides
type AWG 20-22) for the tLAN connections (EN 55014-1);
Avoid short-circuits between V+ and GND so as to not damage the instrument;
Perform all the maintenance and installation operations when the unit is connected to the power
supply;
Separate the power cables (relay outputs) from the cables corresponding to the probes, digital inputs
and serial line;
Use a transformer dedicated exclusively to the electronic controllers for the power supply.
Protection against electric shock and warnings for maintenance
The system made up of a control board (MCH200000*) and the other optional cards (MCH200002*,
MCH200485*, MCHRTF****, CONVONOFF*, CONV0/10A*, EVD000040*) represents a control device to
be integrated in class I or class II equipment.
The class of protection against electric shock depends on the method with which the control device is
integrated into the unit made by the manufacturer.
Disconnect the power supply before working on the board for assembly, maintenance and replacement.
The protection against short-circuits, due to defective wiring, must be guaranteed by the manufacturer of
the equipment that the control device is integrated into.
Maximum cable lengths of the connection cables
NTC/ratiometric probe connection cable 10 m
digital input connection cable 10 m
power output connection cable 5 m
fan control output connection cable 5 m
power cable 3 m
Tab. 10.e
11.1 Software updates
11.1.1 Notes for version 1.5
improved B00 = 10
optimized the management of partialization valve with semihermetic compressors.
11.2 notes for version 1.6
added part load in high pressure, see parameter P04;
added defrost option (start by pressure, end by temperature ), see parameter D02=2;
added preventive fan operation function for high condensing temperature, see parameter F14;
added integrated Modbus protocol, see parameter H23;
added direct correspondence between D.I. and compressor D.O. (for condensing units only), see
parameter r05=3;
Added alarm relay management, see parameter P21.
11.3 Notes for version 1.7
refined auto-start function in antifreeze;
optimised exchange of variables over the Modbus
®
protocol;
improved set point compensation based on the outside temperature;
added minimum pump operating time;
optimised defrost with semi-hermetic compressors;
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Carel µC2 Specifications

General

Brand	Carel
Model	µC2
Category	Controller
Language	English