Trane CXPA, Установка, эксплуатация и обслуживание

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SSC-SVN001F-EN 17
Fig.09 - 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.
This will prevent the dilution of oil and
the bearings overload in the initial com-
pressor starts. When the compressor is
off, the crankcase temperature should
Tab. 09 - Resistance of Crackcase
Power Voltage Trane Code
W V X1314 m in. m áx. Conexion Cable Resistance Fixing Chape
40 240 X13140740-01 1 140 155 1170 330 60
240 X13140710-01 1 185 210 520 460 60
480 X13140710-02 1 185 210 520 460 60
575 X13140710-03 1 185 210 520 460 60
230 X13140712-05 1 230 290 460 740 60
380 X13140712-06 1 230 290 460 740 60
460 X13140712-08 1 230 290 460 740 60
230 X13140712-11 2 300 375 560 890 60
460 X13140712-14 2 300 375 560 890 60
70
100
160
Cra ckcase Resista nce
Quantity
Diam eter (m m ) Length (m m )
Electrical Data
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.
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.
!