C6.2.27/0716-0219/E
7
3.3
Shut-off valves and adaptors
CAUTION
Leaking system! System breakdown!
It is strongly recommended to
periodically re-torque all pipe and fixing connections to the original setting after
the system has been put into operation.
Figure 4
Copeland Scroll compressors are delivered with a discharge check valve fitted inside the
discharge port and rubber plugs fitted to the suction and discharge ports as standard. There are
options to fit either Rotalock valves, or Rotalock adaptors. Using either straight or angled adaptors
provides a way to convert a Rotalock into a brazing connection.
Refer to
Table 4
hereunder for proper tightening torques:
Torque [Nm]
Rotalock 1 ¼"
– 12 UNF
100
– 110
Rotalock 1 ¾"
– 12 UNF
170 - 180
Table 3
NOTE: More information about adaptors and shut-off valves can be found in the "Spare
parts list" available at
3.4
Suction accumulators
CAUTION
Inadequate lubrication! Bearing destruction!
Minimise liquid refrigerant
returning to the compressor. Too much refrigerant dilutes the oil. Liquid
refrigerant can wash the oil off the bearings leading to overheating and bearing
failure.
Irrespective of system charge, oil dilution may occur if large amounts of liquid refrigerant
repeatedly flood back to the compressor during:
▪
normal off cycles
▪
defrost
▪
varying loads
In such a case an accumulator must be used to reduce flood-back to a safe level that the
compressor can handle. The use of an accumulator is dependent on the application. If an
accumulator must be used, the oil-return orifice should be 2.0 mm in diameter for all models.
The size of the accumulator depends upon the operating range of the system and the amount of
sub-cooling and subsequent head pressure allowed by the refrigerant control.
