Carrier 30RBP-170R - ELECTRICAL CONNECTION; Power Supply Requirements; Voltage Phase Imbalance Check; Power Connection;Disconnect Switch

6 - ELECTRICAL CONNECTION
Please refer to the certied dimensional drawings, supplied with
the unit.
6.1 - Power supply
The power supply must meet the specication on the unit's
nameplate.
The supply voltage must be within the range specied in the
electrical data table.
For connections, refer to the wiring diagrams and certified
dimensional drawings.
WARNING:
Operation of the unit with an incorrect supply voltage or
excessive phase imbalance constitutes misuse which will
invalidate the manufacturer's warranty. If the phase imbalance
exceeds 2% for voltage, or 10% for current, contact your local
electricity supplier at once and ensure that the unit is not
switched on until corrective measures have been taken.
After the unit has been started up, 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, the power supply of the unit must be
maintained permanently (the heaters must be powered on).
Specic data 30RQ/30RQP
Otherwise, the suction shut-o󰀨 valves on each circuit must be
closed.
6.2 - 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 with the following values:
AB = 406 V; BC = 399 V; AC = 394 V
Average voltage = (406 + 399 + 394)/3
= 1199/3
= 399.7 i.e. 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.
6.3 - Power connection/disconnect switch
The power connection of the unit is carried out at a single point
upstream of the unit’s disconnect switch.
6.4 - Recommended cable 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 the manufacturer in any way liable.
After wire sizing has been completed, using the certied dimensional
drawing, the installer must verify the appropriate means of
connection and dene any modications necessary on site.
The connections provided as standard for the customer-supplied
power supply cables are designed for the number and type of
cables listed in the table below.
The calculations of favourable and unfavourable cases are
performed by using the maximum current possible for each unit
tted with a hydraulic module (see the tables of electrical data for
the unit and the hydraulic module).
The study includes the standardised installation cases according
to IEC 60364: Cables with PVC (70 °C) or XLPE (90 °C) insulation
with copper core; routing in accordance with table 52C of the
standard.
The maximum length mentioned is calculated to limit the voltage
drop to 5%.
IMPORTANT:
Before connecting the main power cables (L1 - L2 - L3), always
check 3 phases are in the correct order (clockwise) before
proceeding to the connection on the main disconnect switch.
Motor
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