Checks, Adjustments And Settings; Setting Of The Controll And Power Devices - Carrier CU-O Series Use & Maintenance Instructions

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6.3 Checks, adjustments and settings

6.4 Setting of the control and
power devices
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When a cell contains more than one unit, each should be fitted with its own
magnetothermal switch.
Now connect the unit paying attention to the colour of the wires that make up the
power supply cable:
a) 230V/3~/50-60 Hz
b) 400V/3N~/50-60 Hz
N.B.: All units are supplied with terminals 3-4 to which it is possible to connect
any device not alive; for example an ambient thermostat.
CAUTION
Magnetothermal safety switches should be used to protect the main power sup-
ply line from power surges.
Only qualified personnel is authorised to replace the safety thermal relays fitted
on motors.
Only qualified personnel must be authorised to make electrical connections.
6.2.2 Connection to the water mains (water condenser)
The water condenser must be connected to the water mains following the indications
on the plates next to the tubes, which are marked IN (ENTRATA) and OUT (USCI-
TA). The diameter of the pipes used to make the connection must not be smaller
than the unit's outlet tubes. Pressure in the water circuit must be at least 1 bar.
Before switching the machine on, ensure that:
- locking screws are fixed tight
- electrical connections have been made correctly
When the unit is opened, check that:
- no tools have been left inside
- assembly has been correctly performed
- there are no gas leaks
- panels have been correctly fixed.
During the testing on make the setting of these devices. Below we list the rated
values of the pressure switches settings; these values must be considered
approximates as size order.
Low pressure switch 0,2 bar
high pressure switch 28 bar working with R404A
4 wires Blue =
Yellow/green =
Brown =
Black =
5 wires Blue =
Yellow/Green =
Brown =
Black =
Black =
phase
earth
phase
phase
neutral
earth
phase
phase
phase
Carrier