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3.11.3 External solenoid valve installation – Tubing recommendations
IMPORTANT
This tube has been tested and qualified at 50 and 60 Hz operation for running
stresses and resonance in a single compressor lab environment. However, in
some compressor applications such as racks and transport applications, the
OEM is strongly advised to re-confirm the acceptability of the tube when the
compressor is subject to additional vibration inputs.
Figure 14: Recommended piping
The dimensions for a typical tube going from the top of the compressor are shown in Figure 15.
Figure 15: Control valve pipe connection for compressor without sound shell
Emerson has developed digital solenoid tubing kits for compressors with brazing stub tubes and 24 V
or 230 V coils. The kits are optimized for fitting with or without sound shell and are valid for all
compressor sizes using an external visible solenoid valve.
3.12 Filter screens
CAUTION
Screen blocking! Compressor breakdown! Use screens with at least
0.6 mm openings.
The use of filter screens finer than 30 x 30
be avoided with these compressors. Field experience has shown that finer mesh screens used to
protect thermal expansion valves, capillary tubes or accumulators can become temporarily or
permanently plugged with normal system debris and block the flow of either oil or refrigerant to the
compressor. Such blockage can result in compressor failure.
3.13 Mufflers
Gas flow through scroll compressors is continuous with relatively low pulsation. External mufflers
may not be required on Copeland scroll compressors. Due to system variability, individual tests
should be conducted by the system manufacturer to verify acceptable levels of sound and vibration.
If adequate attenuation is not achieved, use a muffler with a larger cross-sectional area to inlet area
ratio. A ratio of 20:1 to 30:1 is recommended. A hollow shell muffler will work quite well. Locate the
16
mesh
(0.6 mm openings) anywhere in the system should
AGL_Ref_DG_YBDK1E_EN_Rev04
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