Carrier AquaForce 30XAV 1050, Installation, Operation And Maintenance Instructions

18

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

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 therefore acceptable.

5.3 - Power connection/disconnect switch

Standard:

 - 30XAV 0500 to 0700 units have one connection point.
 - 30XAV 0800 to 1150 units have two connection points 

(one with option 81).

5.4 - 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 guide-line, 
and does not make Carrier in any way liable. After wire sizing 

has been completed, using the certified dimensional 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 
column 2 of the table on the next page.

The calculations are based on the maximum machine current 
(see electrical data tables).

The calculations of favourable and unfavourable cases are 
based on the maximum current for each unit (see electrical 
data tables). For the design the standardised installation 
methods in accordance with IEC 60364 are used: PVC  
(70 °C) or XLPE (90 °C) insulated cables with copper core; 
arrangement to comply with table 52c of the above standard. 
The maximum temperature is 46 °C. The given maximum length 
is calculated to limit the voltage drop to 5%.

IMPORTANT: Before connection of  the main power cables 
(L1 - L2 - L3) on the terminal block, it is imperative to check 
the phase rotation of the 3 phases before proceeding to the 
connection on then terminal block or the main disconnect/
isolator switch.

5.5 - Power cable entry

The power cables can enter the 30XAV control box from 
below or from the unit side: refer to unit drawings. For 30XAV 
unit sizes 500 to 1150 the control box that includes the power 
supply cable connection terminal is located in the lower part 
of the unit. In this case the control box is raised by 120 mm 
compared to the lowest point of the chassis. 

The cable entry point depends on the unit configuration:

1.  Unit raised from the ground (e.g. installation on support 

rails): It is recommended to enter the power cables from 
below the control box. A removable aluminium plate 
below the control box allows introduction of the cables.

2.  Unit placed on the ground: For power cable entry from 

below the control box ensure that the cable bend radius 
is compatible with the connection space available in the 
control box. If not, an aluminium plate on the control 
box face allows introduction of the cables.

For units with three circuits with option 81 (single power 
connection point) the connection must be made from below 
the unit.

IMPORTANT: Check the cable bend radius for cable entry 
into a control box, located in the lower part of the unit.

Refer to the certified dimensional drawing for the unit.

Motor