Low-Pressure Protection; Crankcase Heater; Insulation Material; Sound And Vibration - Emerson Copeland EazyCool ZX Series Application Manuallines

3.3.6 Low-pressure protection

WARNING
Operation below ambient pressure! Fire hazard! During operation below
ambient pressure, a flammable mixture can form inside the system. Make sure
that air does not enter the system.
IMPORTANT
Operation outside the application envelope! Compressor breakdown! A
low-pressure protection shall be fitted in the suction line to stop the unit when
it operates outside the envelope limits.
Make sure that the pressure never falls below atmospheric pressure. If it does, immediately de-
energize the power supply of the unit and check the cause of the low pressure before restarting the
unit.

3.3.7 Crankcase heater

IMPORTANT
Oil dilution! Bearing malfunction! Turn the crankcase heater on 12 hours
before starting the unit.
The initial start-up in the field is a very critical moment for any compressor because all load-bearing
surfaces are new and require a short break-in period to carry high loads under adverse conditions.
The crankcase heater must be turned on a minimum of 12 hours prior to starting the unit. This
will prevent oil dilution and bearing stress on compressor initial start-up. The crankcase heater must
remain energized during compressor off cycles.

3.3.8 Insulation material

Insulation material is commonly used in a system to insulate the suction line, suction accumulator,
expansion valve bulb or discharge line thermostat. When choosing the insulation material, particular
attention shall be paid to its non-electrostatic properties, as it could be a potential ignition source.

3.3.9 Sound and vibration

WARNING
Vibrations! Creation of flammable atmosphere! Carefully check the system
for vibrations.
Vibrations during unit operation can cause cracks which could lead to refrigerant leakage. This
situation must be avoided by the system manufacturer/installer. To this end, the pipework must be
carefully designed when connecting the unit to a system.

3.3.10 High-potential testing

WARNING
High-potential testing in a flammable atmosphere! Fire hazard! Make sure
the atmosphere is non-flammable before performing high-potential testing. DO
NOT perform any high-potential test when the compressor is charged with
flammable refrigerant.
WARNING
Conductor cables! Electrical shock! Shut off power supply before high-
potential testing.
CAUTION
Internal arcing! Motor destruction! Do not perform high-voltage or insulation
tests if the compressor housing is under vacuum.
Emerson subjects all units to a high-voltage test after final assembly. Each unit is tested according
to EN 60034-1 at a differential voltage of 1000 V plus twice the nominal voltage.
Since high-voltage tests lead to premature ageing of the winding insulation, further additional tests
of that nature are not recommended. However, if it has to be done for any reason, it shall not be
made with the unit charged with refrigerant. Run the test with a lower voltage, as described above.
Disconnect all electronic devices, eg, motor protection module, fan speed control, etc prior to testing.
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