7 - ELECTRICAL CONNECTION
Please refer to the certified dimensional drawings, supplied with
the unit (also available on the internet).
7.1 - 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 and the certified dimensional drawings.
Operation of the unit with an improper supply
voltage or excessive phase imbalance constitutes
abuse which will invalidate the CIAT warranty. If the
phase imbalance exceeds 2% for voltage, or 10%
for current, contact your local electricity supply at
once and ensure that the heat pump is not switched
on until corrective measures have been taken.
7.2 - 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 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
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.
7.3 - 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 guideline, and
does not make CIAT 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
below.
The calculations are based on the maximum machine current
(see electrical data tables). Standard installation practises for
units installed outside have been applied in accordance with IEC
60364, table 52C:
-
No. 17: suspended aerial lines,
-
No. 61: buried conduit with a derating coefficient of 20.
The calculation is based on PVC or XLPE insulated cables with
copper core. A maximum ambient temperature of 40°C has been
taken into consideration for TD units. The given wire length limits
the voltage drop to < 5%.
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 the main
disconnect/isolator switch.
7.3.1 - Power cable entry
The power cables can enter the TD control box from below or
from the side of the unit, at the bottom of the angle iron. Pre-
punched holes facilitate the entry. Refer to the certified
dimensional drawing for the unit. An opening below the control
box allows introduction of the cables.
7.4 - Field control wiring
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 Aquaciat Caléo™ TD Connect Touch Control IOM
and the certified wiring diagram supplied with the unit for the field
control wiring of the following features:
-
Condenser pump interlock (mandatory)
-
Remote on/off switch
-
Demand limit external switch
-
Remote dual setpoint switch
-
Alarm, alert and operation report
7.5 - Power supply
After the unit has been commissioned, 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 and stored the power supply must be
maintained to ensure supply to the heaters (unit frost protection).
Motor
EN-21 AQUACIAT
CALÉO™
TD
