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muffler at minimum 15 cm to maximum 45 cm from the compressor for the most effective operation.
The farther the muffler is placed from the compressor within these ranges, the more effective. Choose
a muffler with a length of 10 to 15
3.14 Sound shell
For the selection of sound reduction material in A2L applications, attention shall be paid to the
electrostatic charge of the material, which could be a potential ignition source.
The standard Emerson sound shell material is not an ignition source for A2L refrigerants (R454C,
R455A, R454A and R1234yf).
Please see Copeland spare parts & accessories catalogue at
gb/tools-resources
to check the available sound shell kits according to compressor model.
3.15 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 for A2L
applications, particular attention shall be paid to its non-electrostatic properties, as it could be a
potential ignition source.
3.16 Sound and vibration
WARNING
Vibrations! Creation of a flammable atmosphere! Carefully check the
system for vibrations in applications with A2L refrigerants.
Vibrations during compressor 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 a scroll compressor to a system.
Figure 16: Example of suction tube design
inherently higher starting torque. This phenomenon, like the one described previously, can easily be
avoided by using standard line isolation techniques.
The sound level of a system is the result of design, quality and application. Scroll compressors sound
power levels generally increase with the compressor model capacity and the condition pressure ratio.
3.17 Compressor oil return, oil balancing, refrigerant floodback and oil dilution tests
CAUTION
Inadequate lubrication! Bearing and moving parts destruction! Ensure
adequate oil return from the system into the compressor at any time. No liquid
refrigerant return to the compressor. Liquid refrigerant dilutes the oil, could
wash the oil off the bearings and moving parts and could lead to overheating
and compressor failure.
The system piping must be carefully designed to ensure sufficient refrigerant gas velocity, so that oil
returns to the compressor at all times and conditions. Individual piping diameter calculation depends
on the refrigerant properties, pressure level, mass flow, and density.
AGL_Ref_DG_YBDK1E_EN_Rev04
cm.
A scroll compressor makes both a rocking and twisting
motion and enough flexibility must be provided in the
pipework to allow starting, stopping and steady state running
of the compressor without transmitting excessive stress into
any line attached to the unit. In a split system, the most
important goal is to ensure minimal vibration in all directions
to avoid transmitting vibrations to the structure to which the
lines are fastened.
Under some conditions, the Copeland scroll has a normal
starting rotational motion that can transmit a transient noise
along the lines. This may be particularly pronounced in
compressors using a three-phase motor due to their
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