Electrical Connection; Power Supply; Voltage Phase Imbalance (%); Power Connection/Disconnect Switch - Carrier Aqua Force 30XA Installation, Operation And Maintenance Instructions

5 - ElECTRICal CONNECTION

Please refer to the certified dimensional drawings, supplied
with the unit.

5.1 - Power supply

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 the 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.

5.2 - 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
Electrical data notes for 30Xa units:
• 30XA 252-1002 units have a single power connection point; 30XA 1102-1702
units have two connection points.
• The control box includes the following standard features:
- One general disconnect switch per circuit
- Starter and motor protection devices for each compressor, the fan(s) and
the pump
- Control devices
field connections:
• All connections to the system and the electrical installations must be in full
accordance with all applicable local codes.
• The Carrier 30XA 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 compo-
nents - part 1: general regulations) are specifically taken into account, when
designing the electrical equipment.
IMPORTaNT:
• Generally the recommendations of IEC 60364 are accepted as compliance
with the requirements of the installation directives.
Conformance with EN 60 204 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.
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.

5.3 - Power connection/disconnect switch

Units
30XA 0252-1002
30XA 1102-1702
• The operating environment for the 30XA units is specified below:
1. Environment* - Environment as classified in EN 60 721 (corresponds to IEC
60721) :
- outdoor installation*
- ambient temperature range: -20°C to +55°C, class 4K4H*
- altitude: ≤ 2000 m
- presence of hard solids, class 4S2* (no significant dust present)
- presence of corrosive and polluting substances, class 4C2 (negligible)
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 connection to TN networks (IEC 60364). For IT
networks the earth connection must not be at the network earth. Provide a
local earth, consult competent local organisations to complete the electrical
installation.
NOTE: 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 30XA units are protected to IP44CW and fulfil this
protection condition.
Motor
Connection points
1 per unit
1 for circuits A and B
1 for circuit(s) C (and D)
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