31
(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.
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 guide-
line, and does not make Carrier in any way liable. After wire
sizing has been completed, using the certied dimen-sional
drawing, the installer must ensure easy connection and dene
any modications necessary on site.
The connections provided as standard for the eld-supplied
power entry cables are designed for the number and type of
wires, listed in the table below.
The calculations are based on the maximum machine cur-rent
(see electrical data tables), and standard installation practises,
in accordance with IEC 60364, table 52C have been applied
(30RQS units are installed outside):
• No. 17: suspended aerial lines,
• No. 61: buried conduit with a derating coefcient 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 impera-tive to
check the correct order of the 3 phases before pro-ceeding
to the connection.
Power cable entry
The power cables can enter the control box from below or
Motor
30RQS/
RQSY
039 1 x 16 165 XLPE Cu 1 x 25 300 PVC Cu
045 1 x 16 165 XLPE Cu 1 x 25 300 PVC Cu
050 1 x 16 165 XLPE Cu 1 x 25 300 PVC Cu
060 1 x 25 210 XLPE Cu 1 x 35 305 PVC Cu
1 x 35 220 XLPE Cu 1 x 50 350 PVC Cu
1 x 1 x 1 x 35 220 XLPE Cu 1 x 70 PVC Cu
1 x 35 220 XLPE Cu 1 x 70 PVC Cu
090 1 x 35 220 XLPE Cu 1 x 70 PVC Cu
100 1 x 70 XLPE Cu 410 PVC Cu
120 1 x 70 XLPE Cu 410 PVC Cu
140 305 XLPE Cu 465 PVC Cu
160 1 x 120 320 XLPE Cu 465 PVC Cu
from the side of the unit, at the bottom of the angle iron.
Pre-punched holes facilitate the entry. Refer to the certied
dimensional drawing for the unit. A removable aluminium
plate below the control box allows introduction of the cables.
IMPORTANT: Field connection of interface circuits may
lead to safety risks: any control box modication must
maintain equipment conformity with local regulations.
Precautions must be taken to prevent accidental electrical
contact between circuits supplied by different sources:
• The routing selection and/or conductor insulation
characteristics must ensure dual electric insulation.
• In case of accidental disconnection, conductor xing
between different conductors and/or in the control box
prevents any contact between the conductor ends and an
active energised part.
Refer to the 30RB/30RQ Touch Pilot Junior control manual
and the certied wiring diagram supplied with the unit for
the eld control wiring of the following features:
• Water heat exchanger pump interlock (mandatory)
• Remote on/off switch
• Demand limit external switch
• Remote dual set point
• Alarm, alert and operation report
• Heating/cooling selection
ATTENTION: After the unit has been commissioned, the
power supply must only be disconnected for quick
maintenance operations (one day maximum). For longer
maintenance operations or when the unit is taken out of
service and stored (e.g. during the winter or if the unit does
not need to generate cooling) the power supply must be
main-tained to ensure supply to the heaters (compressor oil
crankcase heaters, unit frost protection).
After all possible options have been connected, the trans-
former ensures the availability of a usable 24 VA or 1 A power
reserve for the control circuit on site.
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