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3.2
Mounting parts
The compressors are designed to be mounted on vibration absorber grommets. The grommets
dampen the start-up surge of the compressor and minimise sound and vibration transmission to the
compressor base during operation. The metal sleeve inside is a guide designed to hold the grommet
in place. It is not designed as a load-bearing member, and application of excessive torque to the
bolts can crush the sleeve. Its inner diameter is approximately 8.5 mm to fit, eg, an M8 screw. The
mounting torque should be 13 ± 1 Nm. It is critically important that the grommet is not compressed.
If the compressors are mounted in tandem or used in parallel, then the hard mountings (bolt M9
5/16") are recommended. The mounting torque should be 27 ± 1 Nm.
See Copeland spare parts & accessories catalogue for reference.
Mounting parts ZH*KCU – Soft mountings
Figure 5: Mounting parts
3.3
Brazing procedure
WARNING
Air/flammable refrigerant mixture! Creation of a potentially flammable
atmosphere! Fire hazard! Remove all refrigerant before opening the system.
When working on a refrigerant-filled system, make sure to follow the safety
and working instructions given in Chapter 6 "Maintenance & repair".
WARNING
High temperature! Burning! Proceed with caution when brazing system
components. Do not touch the compressor until it has cooled down. Ensure
that other materials in the area of the compressor do not come into contact
with it.
CAUTION
Blockage! Compressor breakdown! Maintain a flow of oxygen-free nitrogen
through the system at very low-pressure during brazing. Nitrogen displaces
the air and prevents the formation of copper oxides in the system. If allowed
to form, the copper oxide material can later be swept through the system and
block screens such as those protecting capillary tubes, thermal expansion
valves, and accumulator oil return orifices.
Contamination or moisture! Bearing failure! Do not remove the connection
plugs until the compressor is set into the unit. This minimises any entry of
contaminants and moisture.
3.3.1 General brazing procedure
Figure 6: Brazing areas
▪ For systems with flammable A3 refrigerant, it is mandatory to flush oxygen-free nitrogen through
the piping during the brazing process.
▪ The copper-coated steel tubes on scroll compressors can be brazed in approximately the same
manner as any copper tube.
▪ Recommended brazing materials: any Silfos material is recommended, preferably with a
minimum of 5 % silver. However, 0 % silver is acceptable.
AGL_HP_ST_ZHKCU_EN_Rev01
Copeland scroll compressors have copper-plated steel
suction and discharge stub tubes. These stub tubes are far
more robust and less prone to leaks than copper tubes. Due
to the different thermal properties of steel and copper,
brazing must be carried out in an appropriate manner.
Refer to Figure 6 and procedure below for the brazing of the
stub tube connections of a scroll compressor.
7
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