15
7.1 - Power supply
The power supply must conform to the specification on the
chiller name plate. The supply voltage must be within the range
specified in the electrical data table.
For connections refer to the wiring diagrams.
WARNING: Operation of the chiller with an improper supply
voltage or excessive phase imbalance constitutes abuse which
will invalidate the Carrier warranty. If the phase imbalance
exceeds 2% for voltage, or 10% for current, contact your local
electricity supply source at once and ensure that the chiller is
not switched on until corrective measures have been taken.
7.2 - Voltage phase imbalance (%)
100 x max. deviation from average voltage
Average voltage
Example:
On a 400 V - 3 ph - 50 Hz supply, the individual phase voltages
were measured to be:
AB = 406 V ; BC = 399 ; AC = 394 V
Average voltage = (406 + 399 + 394)/3 = 1199/3
= 399.7 say 400 V
Calculate the maximum deviation from the 400 V average:
(AB) = 406 - 400 = 6
(BC) = 400 - 399 = 1
(CA) = 400 - 394 = 6
The maximum deviation from the average is 6 V. The greatest
percentage deviation is:100 x 6/400 = 1.5 %
This is less than the permissible 2% and is therefore acceptable.
Motor
8 - RECOMMENDED WIRE SECTIONS
Wire sizing is the responsibility of the installer, and depends on
the characteristics and regulations applicable to each installation
site. The following is only to be used as a guideline, and does
not make Carrier in any way liable. After wire sizing has been
completed, using the certified dimensional drawing, the instal-
ler must ensure easy connection and define any modifications
necessary on site. The connections provided as standard for the
field-supplied power entry cables to the general disconnect/
isolator switch are designed for the number and type of wires,
listed in the table below.
The calculations are based on the maximum machine current
(see electrical data tables) and the standard installation practises,
in accordance with IEC 60364, table 52C.
- For 30RY units, installed outside, the following standard
installation practises have been maintained:
No.17: suspended aerial lines, and No. 61: buried
conduit with a derating coefficient of 20.
The calculation is based on PVC or XLPE insulated
cables with copper core.
A maximum ambient temperature of 46°C has been
taken into consideration.
The given wire length limits the voltage drop to
< 5% (length L in metres - see table below).
IMPORTANT: Before connection of the main power cables
(L1 - L2 - L3) on the terminal block, it is imperative to check
the correct order of the 3 phases before proceeding to the
connection on the main disconnect/isolator switch.
8.1 - Field control wiring
For the field control wiring of the following elements please
refer to the 30RA/RH - RY/RYH “B” series Pro-Dialog Plus
Control manual, and the certified wiring diagram supplied with
the unit:
- Unit start/stop
- Heating/cooling selection
- Set-point selection
- Customer interlock - (example: auxiliary contact of the
chilled water pump contactor)
- General alarm reporting, circuit A and circuit B
Units S Min. (mm
2
) Cable type L (m) S Max. (mm
2
) Cable type L (m)
by phase by phase
30RY 017 1x 6 XLPE Cu 90 1x 16 PVC Cu 245
30RY 021 1x 6 XLPE Cu 90 1x 16 PVC Cu 245
30RY 026 1x 6 XLPE Cu 90 1x 16 PVC Cu 245
30RY 033 1x 6 XLPE Cu 90 1x 16 PVC Cu 245
30RY 040 1x 6 XLPE Cu 90 1x 16 PVC Cu 245
30RY 050 1x 6 XLPE Cu 80 1x 25 PVC Cu 300
30RY 060 1x 10 XLPE Cu 110 1x 25 PVC Cu 300
30RY 070 1x 10 XLPE Cu 100 1x 35 PVC Cu 310
30RY 080 1x 16 XLPE Cu 125 1x 50 PVC Cu 350
S Power supply cable section (see the diagram in chapter: "Electrical connection")
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