10
C6.2.41/0219/E
NOTE: Since the discharge stub contains a check valve, care must be taken not to overheat
it to prevent brazing material from flowing into it.
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 7
Copeland Scroll compressors ZR*KRE are delivered with a discharge check valve fitted inside the
discharge port and stub tubes as standard. There are options to fit Rotalock adaptors and Rotalock
valves.
Brazing connections can be converted to Rotalock by means of adaptors. Rotalock shut-off valves
are available for the suction as well as discharge sides. Using either straight or angled adaptors
provides a way to convert a Rotalock into a brazing connection.
Refer to the following table for proper tightening torques:
Torque [Nm]
Rotalock ¾"
– 16UNF
40-50
Rotalock 1"
– 14UNS
70-80
Rotalock 1 ¼"
– 12UNF
110-135
Rotalock 1 ¾"
– 12UNF
135-160
Rotalock 2 ¼"
– 12UNF
165-190
Table 4
NOTE: More information about adaptors and shut-off valves can be found in the spare parts
software at
www.climate.emerson.com/en-gb
.
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.
