D-EIMWC00908-16EN - 22/52
EWWD FZ units use variable speed compressors that may operate at different rated conditions; the above listed
electrical data are for reference only, please refer to selection to to have specific unit electrical data.
Electrical components
All power and interface electrical connections are specified in the wiring diagram that is shipped with the machine.
The installer must supply the following components:
-
Power supply cables (dedicated conduit)
-
Interconnection and interface cables (dedicated conduit)
-
Suitable line protection devices (fuses or circuit breakers, please see electrical data)
Power Wiring
The standard power wiring connection to chillers is single-point. The electrical panel contains the main disconnect switch
that isolates power to the unit when switched off. Compressor overload and short-circuit protection is accomplished by
fuses installed in the electrical panel.
Proper phase sequence to the unit is not required as far as the unit operation is concerned. Correct motor rotation is
established by the chiller control system regardless of the connected phase sequence.
All line-side wiring must be in accordance with local regulation and be made with copper wire and copper lugs only. The
table below is a reference only for dimensioning protection devices and wiring. Due to different needs and local codes,
the customer may select different components.
CAUTION
In installations with power supply lines longer than 50 metres, phase-to-phase and phase-to-earth inductive couplings
between phases generate significant phenomena, namely:
unbalancing of phase currents
excessive voltage drop
In order to limit this phenomena, it is good practise to lay out the phase wires symmetrically, as described in the
figure.
Fig. 1 - Installation of long power supply wires
Table 3
– Power Wiring recommended fuses and cables
Model
320FZ
430FZ
520FZ
640FZ
860FZ
C10FZ
Disconnect Switch Size
400 A
400 A
400 A
400 A
630 A
630 A
Short circuit rating (note 1)
10 kA
10 kA
10 kA
25 kA
25 kA
25 kA
Recommended Fuses
250 A gG
250 A gG
250 A gG
355 A gG
500 A gG
500 A gG
Maximum Wire Size (note 2)
2x150 mm2
2x150 mm2
2x150 mm2
2x150 mm2
2x240 mm2
2x240 mm2
Note 1:
Short-circuit current ratings are referred to 0.25 s duration of short circuit. In case recommended fuses are installed on site for chiller
protection, higher short circuit ratings can be achieved as they have a limiting effect.
Note 2:
Maximum wire size is the maximum allowed by the disconnect switch terminals. In case a larger conductor size is needed, contact
factory for asking special incoming lugs.
Summary of Contents for EWWD320
Page 16: ...D EIMWC00908 16EN 16 52 Figure 4 Evaporator pressure drop...
Page 17: ...D EIMWC00908 16EN 17 52...
Page 18: ...D EIMWC00908 16EN 18 52 Figure 5 Condenser pressure drop...
Page 34: ...D EIMWC00908 16EN 34 52 Figure 12 Compressor overview...
Page 50: ...D EIMWC00908 16EN 50 52...
Page 51: ...D EIMWC00908 16EN 51 52...
