C6.3.1/0116-0716/E
5
2.5.2 Application limits
For application envelopes please refer to Copeland brand products Select software at
2.6 Design features
2.6.1 Compressor construction
All compressors are fitted with Stream valve plates which cannot be dismantled. To maintain the
high capacity of these compressors in case of exchange, the correct valve-plate-to-body gasket
must always be selected.
Each cylinder head has 2 plugged 1/8" - 27
NPTF tapped holes for connecting high-
pressure switches.
These high-pressure switches must be
calibrated and tested before putting the
compressor into service. They must stop the
compressor if the allowable pressure is
exceeded.
The complete cylinder head is under
discharge pressure.
Figure 2
2.6.2 Compressor cooling
Compressor motors must always be cooled, and cylinder head cooling may also be needed at
certain operating conditions.
All Stream compressors are suction gas-cooled. With suction gas-cooled compressors, the
motor is cooled by refrigerant gas that is led over the motor. An additional fan may be required
depending upon the operating conditions (see Copeland brand products Select software at
2.6.3 Demand cooling
"Demand Cooling" as the term implies means liquid refrigerant injection on demand.
For low temperature applications with R407F, R407A, R448A, R449A and R22, Demand Cooling
can be required on the following compressors:
4MF-13X
4ML-15X
4MM-20X
4MT-22X
4MU-25X
6MM-30X
6MT-35X
6MU-40X
NOTE:
R22 is no longer allowed for new refrigeration systems in Europe.
2.6.4 Unloaded start
With direct starting the motor of a compressor is switched directly into the mains by means of a
switch. The resulting breakaway starting current amounts to multiple times the rated motor
current operating maximum, without consideration being given to transient phenomena.
In the case of high-powered motors the breakaway starting currents become so large that they
lead to disruptive voltage dips in the mains. The compressors that are subject to current
limitation must therefore by all means be equipped with starting load reduction to guarantee
perfect starting even when the voltages amount to less than approximately 85% of the voltage
on the nameplate.
2.6.5 Capacity control
For 4M* and 6M* compressors a mechanical capacity control is available. The system used is
blocked suction. Be aware that unloaded operation changes the application range of the
compressor.
NOTE: For the application range of the compressors with capacity control, refer to
Technical Information D7.21.2 "Stream semi-hermetic compressor capacity control".
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