Protection Devices; Crankcase Heaters; Pressure Protection Devices; High Pressure Protection - Emerson Scroll ZB*KAU Application Manuallines

CAUTION
Overheating! Terminal Fusite damage! Ensure
correct connection of cables to the compressor terminal
Fusite to avoid local overheating of Fusite pins which
might lead to refrigerant leaks.
Special attention shall be paid to the electrical
connections owing to possible local overheating.
Figure 11 and Figure 12 show Terminal dome cover
and correct electrical connection. This connection is
only detailed for services propose.
Figure 11 - Terminal dome cover and
correct electrical installation, European
Electrical

Figure 12 - European Electrical connections

Figure 13 – Cover, European
© 2018 Emerson Climate Technologies, Inc.

4.2.3. Protection devices

Independently from the internal motor protection, fuses
must be installed before the compressor. The selection
of fuses should be carried out according to UL
standards, RLA and LRA. Failing to install fuses before
the compressor or selecting inappropriate fuses may
result in compressor failure.

4.2.4. Crankcase heaters

Crankcase heaters are not released for ZB*KAU
compressors.

4.3. Pressure protection devices

4.3.1. High pressure protection

For systems conforming to , IEC 60335-2-89, UL 60335-
2-89 and EN 60335-2-89 no high-pressure switch is
required.

4.3.2. Low-pressure protection

Operation under ambient pressure! During operation
under ambient pressure an explosive mixture can form
inside the system. Make sure that the pressure never
falls below atmospheric pressure
CAUTION
Operation outside the application envelope! A low-
pressure protection shall be fitted in the suction line to
stop the compressor when it operates outside the
envelope limits.
CAUTION
Loss of system charge! Loss of lubrication! Bearing
malfunction and compressor breakdown! A low-
pressure limiter protection must be installed and set
above the atmospheric pressure. Do not bridge or by-
pass the low-pressure limiter. Do not operate under
atmospheric pressure.
In some instances, systems must operate at low
evaporating pressure because of the low ambient
temperatures, sometimes combined with a high level of
relative humidity.
adequate defrost strategy control will prevent the
14
AE4-1431 R1
Proper evaporator sizing and