Trane CGAD020, Installation Operation & Maintenance

Page: 18 / 85

CGAD-SVN02C-EN 18
Operational
Conditions
Fig.08 - Resistance of crankcase
Recommended for position fixing
Crankcase Resistance
Trane recommends the use of crankcase
when the load of the system refrigerant
load exceeds the refrigerant compressor
limit (RCL). The needs of crankcase
resistance are directly related to the
possibility of liquid migration to the
compressor, and consequently causing
poor lubrication of it. Migration can occur
during long periods of compressor
shutdown (over 8 hours). The crankcase
resistance is recommended to eliminate
the liquid migration when these downtime
long periods.The crankcase resistance
must be installed on the compressor
housing and below the removal oil point.
The crankcase resistance must remain
energized while the compressor is off.
Attention:
The strength of crankcase must be
energized at least 12 hours before the
startup of the compressor (with the service
valves open) and should be maintained
until the compressor energized startup.
!
This will prevent the dilution of oil and the
bearings overload in the initial compressor
starts. When the compressor is off, the
crankcase temperature should be kept at
least 10°C above the refrigerant
temperature in the suction side (low
pressure side). This requirement ensures
that the refrigerant will not be retained in
the compressor crankcase. Tests can be
done to ensure that the appropriate
temperature of the oil is maintained below
the ambient conditions (temperature and
wind).
Therefore, for a temperature below -5°C
and an over 5m/s wind speed, it is
recommended that the resistors be
thermally isolated to limit the energy loss to
the environment.
Notes:
1)oilload, refers tothe total filed replacement.
2)In retrofit ormaintenanceprocedures, the idealisthat there is no mineral oilandsynthetic oilmixture! Themaximum percentage ofmixture of mineral andsyntheticoil is5%.Forexample, fora retrofitoperation ofR407C,
when the chillerwill beloaded with 20 liters of syntheticoilwill be tolerateinthesystem up to 1 literof mineraloil. Itapplies the same ruleintheconversion ofsyntheticoilformineral oil.
IMPORTANT
Temperatures
Superheating 5° C to 10°C
Subcooling 6° C to 12° C
Table 04 - load and Refrigerant Oil
RECOMMENDATION
The oil recommended by Trane do Brasil
to be used on the CGAD units is
TRANE
OIL 48 .
M ODEL REFRIG. OLEO RECOM M ENDED COM P R.1 CARGO REFRIG.(Kg) CARGO OLEO (L) COM P R.2 CARGO REFRIG.(Kg) CARGO OLEO (L)
CGAD020 R407C TRANE OIL-00048 ouDANFOSS 160SZ 2xSZ125 18,5 7,6
CGAD025 R407C TRANE OIL-00048 ouDANFOSS 160SZ SZ125/SZ185 22,0 10,0
CGAD030 R407C TRANE OIL-00048 ouDANFOSS 160SZ 2xSZ185 24,0 12,4
CGAD040 R407C TRANE OIL-00048 ouDANFOSS 160SZ 2xSZ125 18,0 7,6 2xSZ125 18,0 7,6
CGAD050 R407C TRANE OIL-00048 ouDANFOSS 160SZ SZ125/SZ185 22,5 10,0 SZ125/SZ185 22,5 10,0
CGAD060 R407C TRANE OIL-00048 ouDANFOSS 160SZ 2xSZ185 27,0 12,4 2xSZ185 27,0 12,4
CGAD070 R407C TRANE OIL-00048 ouDANFOSS 160SZ SZ185 31,5 13,8 SZ185 31,5 13,8
CGAD080 R407C TRANE OIL-00048 ouDANFOSS 160SZ SZ125 36,0 16,2 SZ125 36,0 16,2
CGAD090 R407C TRANE OIL-00048 ouDANFOSS 160SZ 3xSZ185 40,5 18,6 3xSZ185 40,5 18,6
CGAD100 R407C TRANE OIL-00048 ou DANFOSS 320 SZ 2x SY300 41,0 17,5 2 xSY300 41,0 17,5
CGAD120 R407C TRANE OIL-00048 ou DANFOSS 320 SZ 3x SY240 66,0 26,0 3 xSY240 66,0 26,0
CGAD150 R407C TRANE OIL-00048 ou DANFOSS 320 SZ 3x SY300 66,0 26,0 3 xSY300 66,0 26,0
CGAD100 R407C COPELAND 3MAF (*) 2XZR300KCE 41,0 11,2 2XZR300KCE 41,0 11,2
CGAD100 R407C COPELAND 3MAF (*) 2XZR310KCE 41,0 11,2 2XZR310KCE 41,0 11,2
CGAD120 R407C COPELAND 3MAF (*) 3XZR250KCE 66,0 13,2 3XZR250KCE 66,0 13,2
CGAD150 R407C COPELAND 3MAF (*) 3XZR300KCE 66,0 16,8 3XZR300KCE 66,0 16,8
CGAD150 R407C COPELAND 3MAF (*) 3XZR310KCE 66,0 16,8 3XZR310KCE 66,0 16,8
CIRCUIT 01 CIRCUIT 02