Crankcase Heaters - Emerson Copeland Stream 4MF-13X Application Manuallines

Mechanical oil pressure switch – ALCO FD-113ZU (A22 - 057)
4.6.2.2
Specifications for electro-mechanical oil pressure switches are as follows:
 Cut-out pressure: 0.63 ± 0.14 bar
 Cut-in pressure: 0.9 ± 0.1 bar
 Time delay:
The Alco Control FD-113ZU mechanical oil pressure switch operates with the above set points.
Figure 17
Protection class: IP30.
4.7

Crankcase heaters

IMPORTANT
Oil dilution! Bearing malfunction! Turn the crankcase heater on 12 hours
before starting the compressor.
A crankcase heater is used to prevent refrigerant from migrating into the shell during standstill
periods. Heaters for 4M* and 6M* compressors are screwed into a sleeve (see Figure 18).
The crankcase heater is available in 120V, 230V and 480V.
The operation of 120V and 230V crankcase heaters is controlled by the CoreSense Diagnostics
module; this is not possible with 480V heaters.
Figure 18: 100 Watt crankcase heater element
18
120 ± 15 sec.
Legend:
11 ..... Voltage connection
21 ..... Control voltage connection
22 ..... Control circuit
24 ..... Alarm connection
A2..... Oil pressure switch
A5..... Compressor terminal box
R ....... Relay
N ....... Neutral connection
t ........ Time delay
C6.3.1/0116-0716/E