26 AGL_HP_VS_YHV2P_E_Rev0
Therefor users should be aware that before the performance specified by EN 12900 is achieved the
compressor needs to be run in.
For YHV*2P compressors it is recommended to run the break in at 2400 rpm, +7 °C evaporating
temperature and 55 °C condensing temperature with a superheat of 10 K for a period of 16 h.
5.6 Initial start-up
CAUTION
Oil dilution! Bearing and moving parts malfunction! It is important to
ensure that new compressors are not subjected to liquid abuse. Turn the
crankcase heating on 12 hours before starting the compressor.
High discharge pressure operation! Compressor damage! Do not use
compressor to test opening setpoint of high-pressure limiter. Bearings and
moving parts are susceptible to damage before they have had several hours
of normal running in.
Liquid and high-pressure loads could be detrimental to new bearings. It is therefore important to
ensure that new compressors are not subjected to liquid abuse and high-pressure run tests. It is not
good practice to use the compressor to test the high-pressure switch function on the production line.
Switch function can be tested with nitrogen prior to installation and wiring can be checked by
disconnecting the high-pressure switch during the run test.
5.7 Start-and-stop routine
The drive controls the start-and-stop routine of the variable speed scroll. This routine allows for soft
starting and controlled stopping, an advantage over traditional on-off control of fixed capacity units.
NOTE: For more information about this topic please refer to the ED3 User Manual (June 2019
version).
5.8 Starting sound
During the very brief start-up, a clicking sound resulting from initial contacting of the spirals is audible;
this is normal. Due to the design of the Copeland Scroll compressors, the internal compression
components always start unloaded even if system pressures are not balanced. In addition, since
internal compressor pressures are always balanced at start-up, low-voltage starting characteristics
are excellent for Copeland Scroll compressors.
5.9 Deep vacuum operation
CAUTION
Vacuum operation! Compressor damage! Copeland Scroll compressors
should never be used to evacuate refrigeration or air-conditioning systems.
Operating scroll compressors in deep vacuum could damage internal motor
parts and lead to unacceptable high temperatures in the compressor housing.
5.10 Shell temperature
During normal operation, the discharge gas as well as the compressor top shell and discharge line
can reach temperatures up to 135 °C – see Chapter 4.5 “Discharge gas temperature protection”.
In a failure mode, the discharge gas temperatures can even get higher. Care must be taken to ensure
that wiring or other materials that could be damaged by these temperatures do not touch the shell.
5.11 Pump-down cycle
WARNING
Vacuum operation! Creation of a flammable mixture! Fire hazard! During
operation in vacuum a flammable mixture can form inside the system. Extreme
attention shall be paid to system tightness. Prevent ambient air from entering
the system.
CAUTION
Vacuum operation! Compressor damage! Compressor operation outside
the operating envelope is not allowed.
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