Electrical data, connections and wiring
MLZ/MLM scroll compressors are available in 6 different motor voltages.
Motor voltage
The compressor terminal box IP rating according to CEI 529 is
IP22
for all models. IP ratings is only
valid when correctly sized cable glands of the IP rating is applied.
• First numeral, level of protection against contact and foreign objects
2
protection against object size over 12.5 mm (fingers of similar)
• Second numeral, level of protection against water
2
protection against dripping water when tilted up to 15°
The IP rating can be upgraded to IP54 with accessory kit (see section Spare parts & Accessories).
IP rating
MLZ/MLM scroll compressors will only compress
gas while rotating counter-clockwise (when
viewed from the compressor top). Since
single-phase motors will start and run in only
one direction, reverse rotation is not a major
consideration. Three-phase motors, however,
will start and run in either direction, depending
on the phase angles of the supplied power. Care
must be taken during installation to ensure that
the compressor operates in the correct direction
(see “Phase sequence and reverse rotation
protection”).
The drawings below show electrical terminal
labelling and should be used as a reference
when wiring the compressor. For three phase
applications, the terminals are labelled T1, T2, and
T3. For single-phase applications the terminals
are labelled C (common), S (start), and R (run).
The terminal cover and gasket should be installed
prior to operation of the compressor. Respect the
"up" marking on gasket and cover and ensure
that the two outside tabs of the cover engage the
terminal box.
Wiring connections
Terminal cover mounting
Terminal cover removal
C & Q terminal box type
C
T1
S
T2
R
T3
P & T terminal box type
push
push
push
Motor voltage
code 1
Motor voltage
code 2
Motor voltage
code 4
Motor voltage
code 5
Motor voltage
code 7
Motor voltage
code 9
Nominal voltage
50 Hz
-
200-220 V - 3 ph
380-415 V - 3 ph
220-240 V - 1 ph
-
-
Voltage range
50 Hz
-
180 - 242 V
342 - 457 V
198 - 264 V
-
-
Nominal voltage
60 Hz
208-230 V - 1 ph
208-230 V - 3 ph
460 V - 3 ph
-
575 V - 3 ph
380 V - 3 ph
Voltage range
60 Hz
187 - 253 V
187 - 253 V
414 - 506 V
-
517 - 632 V
342 - 418 V
20
FRCC.PC.015.A8.02
Application Guidelines