28
Monobloc Outdoor Unit Installation Manual
CAUTION
:
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 (e.g. during the winter or if the unit does not need to generate cooling) the
power supply must be maintained to ensure supply to the electric heaters (compressor coil heater, unit
frost protection).
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 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 are designed for the number and
type of wires, listed in the table below.
The calculations are based on the maximum machine current (see nameplate and electrical data tables), and
standard installation practises, in accordance with IEC 60364, table 52C have been applied:
• 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
46°C has been taken into consideration. The given wire length limits the voltage drop to < 5% (length L in metres -
see table below).
IMPORTANT:
Before connection of the main power cables (L1 - L2 - L3 – N - PE) on the terminal block, it is imperative to check
the correct order of the 3 phases before proceeding to the connection and the good connection of the neutral wire
(if the neutral conductor is not connected correctly, the unit can be damaged permanently).
7.8.4 Control cable specifications (dependant on parameter settings)
Description
Designation
Line Spec.
Length
Cross
Sectional Area
(mm
2
)
Connection
Destination (TB X2)
Integrated sensor for Estia
DHW cylinder (10KOhm)
AO#01
2 wire
6m (Max.)
≥0.75
14, 18
Accessory Sensor for
field supply DHW cylinder
(10KOhm)
AO#01
2 wire
(Integrated)
6m
≥0.75
14, 18
Chiller water system
temperature sensor
(5KOhm)
AO#02
2 wire
(integrated)
15m
≥0.75
15, 18
Outdoor air temperature
sensor (3KOhm)
AO#04
2 wire
50m (Max.)
≥0.5
17, 18
Remote controller (WUI)
12V, B-, 0v, B+
4 wire
50m (Max.)
≥0.75
24, 3, 25, 1
