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8.7 CRANKCASE HEATER
Crankcase heater is used to prevent refrigerant
migration into the compressor shell during compressor
off. It is suggested to be installed on all compressors for
refrigeration application. It should be active at minimum
12 hours before the first compressor start and be active
when compressor is off. This will prevent oil dilution and
bearing stress on initial start up.
The crankcase heater must be mounted below the
oil sight glass approximately 10-40 mm from the
compressor bottom.
Figure 8.7 Crankcase heater
dimension
Table
8.7 Recommended crankcase heaters
Table
8.6 MAXIMUM RECOMMENDED REFRIGERANT CHARGE FOR ALL
APPROVED REFRIGERANTS
COMPRESSOR SIZE
MAXIMUM CHARGE (KG)
2 HP
2.8
2.5-3 HP
3.5
3.5-5 HP
4.5
6 HP
5.5
7 HP
6.5
8-9 HP
8
10-13 HP
10.5
SE scroll compressors are tolerant to liquid refrigerant, despite it, Embraco recommends avoiding this running
condition. If the refrigerant charge is higher than the limits listed in the upper table, it is recommended to use
additional protections in the system to ensure proper running conditions (piping design, suction accumulators,
crankcase heaters, pump down).
MODEL
ALTERNATIVE 1
ALTERNATIVE 2
COMPRESSOR
DIAMETER
(mm)
VOLTAGE
(V)
NOMINAL
POWER
(W)
LENGTH
(mm)
VOLTAGE (V)
NOMINAL
POWER
(W)
LENGTH
(mm)
SE6015-SE6043
220
70
490
230
70
480
168
SE6053-SE6089
220
90
590
230
70
570
197
SE2006-SE2020
220
70
490
230
70
480
168
The compressor is safe to start without crankcase heater when the refrigerant charge quantity is less than
recommended charge limit (see Table in Chapter
8.6). but nevertheless Embraco recommends usage of the
crankcase heater.
