21
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 therefore acceptable.
162-262 1 X (as standard)
302-522 1 -
602-802 2* -
162-262 1 X (as standard)
302-522 1 X
602-802 2* X
162-262 1 N/A
302-522 1 X
602-802 2* X
* 2 connection points: one for circuits A and B and one for circuit C
N/A Not available
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 certified dimen-
sional drawing, the installer 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 on the next page.
Please refer to the certified dimensional drawings, supplied
with the unit.
The power supply must conform to the specification on the
chiller nameplate. The supply voltage must be within the range
specified in the electrical data table. For connections refer
to the wiring diagrams and certified dimensional drawings.
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 at once and
ensure that the chiller is not switched on until corrective
measures have been taken.
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 V; 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
• 30RB 162-522 units have a single power connection point immediately
upstream of the two main disconnect switches.
• 30RB 602-802 units have two connection points upstream of the main
disconnect switches.
• The control box includes:
- One main disconnect switch
- Starter and motor protection devices for each compressor, the fans) and
the pump
- Control devices
All connections to the system and the electrical installations must be in full
accordance with all applicable local codes.
• The Carrier 30RB units are designed and built to ensure conformance with
these codes. The recommendations of European standard EN 60 204-1
(corresponds to IEC 60204-1) (machine safety - electrical machine components
- part 1: general regulations) are specically taken into account, when designing
the electrical equipment.
Circuit A has disconnect switches and branch sections, designed to supply the
evaporator pump power input.
• Generally the recommendations of International Electrotechnical Commission
document IEC 60364 are accepted as compliance with the requirements of the
installation directives. Conformance with EN 60204 is the best means of
ensuring compliance with the Machines Directive § 1.5.1.
• Annex B of EN 60204-1 describes the electrical characteristics used for the
operation of the machines.
1. The operating environment for the 30RB units is specied below:
• Environment* - Environment as classied in EN 60721 (corresponds to IEC 60721):
- outdoor installation*
- ambient temperature range: -20°C to +48°C ± 1 K, class 4K3*
- altitude: ≤ 2000 m (see note for table 5.3 - Electrical data, hydronic module)
- presence of hard solids, class 4S2 (no signicant dust present)
- presence of corrosive and polluting substances, class 4C2 (negligible)
- vibration and shock, class 4M2
- Competence of personnel, class BA4* (trained personnel - IEC 60364)
2. Power supply frequency variation: ± 2 Hz.
3. The neutral (N) line must not be connected directly to the unit (if necessary use
a transformer).
4. Overcurrent protection of the power supply conductors is not provided with the
unit.
5. The factory-installed disconnect switch(es)/circuit breaker(s) is (are) of a type
suitable for power interruption in accordance with EN 60947-3 (corresponds to
IEC 60947-3).
6. The units are designed for simplied connection on TN(s) networks (IEC 60364).
For IT networks provide a local earth and consult competent local organisations
to complete the electrical installation.
7. Derived currents: If protection by monitoring of derived currents is necessary to
ensure the safety of the installation, the control of the cut-out value must take the
presence of leak currents into consideration that result from the use of frequency
converters in the unit. A value of at least 150 mA is recommended to control
dierential protection devices.
If particular aspects of an actual installation do not conform to the
conditions described above, or if there are other conditions which should be
considered, always contact your local Carrier representative.
* The required protection level for this class is IP43BW (according to reference
document IEC 60529). All 30RB units are protected to IP44CW and full this
protection condition.
Motor
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