Electrical Connection; Electrical Connections, Control Box; Power Supply; Voltage Phase Imbalance (%) - Carrier AquaSnap 61WG Series Installation, Operation And Maintenance Instructions

6 - ELECTRICAL CONNECTION

6.1 - Electrical connections, control box

18
S
Legend
1 Main disconnect switch
PE Earth connection
S Power supply cable section (see table "Recommended wire sections").
NOTES:
The units have only one power connection point located at the
main disconnect switch.
Before connecting electric power cables, it is imperative to check
the correct order of the 3 phases (L1 - L2 - L3).
Non-certified drawings.
Refer to the certified dimensional drawings.
Before connecting the unit check that the phase order in the
customer control box is the same as shown in the customer wiring
diagrams.

6.2 - Power supply

The power supply must conform to the specification on the unit
nameplate. The supply voltage must be within the range specified in
the electrical data table. For connections refer to the wiring diagrams.
WARNING: Operation of the unit with an incorrect supply
voltage or excessive phase imbalance constitutes abuse
which will invalidate the warranty. If the phase imbalance
exceeds 2% for voltage, or 10% for current, contact your local
electricity supply at once and ensure that the unit is not
switched on until corrective measures have been taken.
42
1
1
18
26
PE

6.3 - 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
Motor
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.

6.4 - 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 the
manufacturer 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 the table on the next page.
The calculations are based on the maximum machine current (see
electrical data tables). For the design the following standardised
installation methods are used, in accordance with IEC 60364, table 52C:
- For units installed inside the building:
- No.13: perforated horizontal cable conduit, and No. 41: closed
conduit.
The calculation is based on PVC or XLPE insulated cables with
copper or aluminium core. A maximum ambient temperature of 40
°C has been taken into account. The given wire length limits 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 correct
order of the 3 phases before proceeding to the connection on
then terminal block or the main disconnect/isolator switch.
6.4.1 - Field control wiring
IMPORTANT: Field connection of interface circuits may lead
to safety risks: any control box modification 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 fixing
between different conductors and/or in the control box
prevents any contact between the conductor ends and an
active energised part.
Refer to the TouchPilot Junior Controls IOM and the certified
wiring diagram supplied with the unit for the field control
wiring of the following features:
- Remote on/off switch
- Remote heat/cool switch
- Demand limit external switch 1
- Remote dual set point
- Alarm report
- Pump control - unit without hydraulic module.
- Relief boiler or electric heater
- Valve control - see description of options 153 and 154 in
the TouchPilot Junior controls manual