Figure 26. Pressure enthalpy curve 2 stage
condenser
economizer
2
3
evaporator
4
P
1
P
3
P P
12
Pressure
(PSI
)
compressor
(2nd stage)
1
5
compressor
6
(1st stage)
Figure 27. Refrigerant flow 2 stage
Oil and Refrigerant Pump
Compressor Lubrication System
A schematic diagram of the compressor lubrication sys-
tem is illustrated below. Oil is pumped from the oil tank
(by a pump and motor located within the tank) through
an oil pressure regulating valve
Operating Principles
designed to maintain a net oil pressure of 18 to 22 psid.
It is then filtered and sent to the oil cooler located in the
economizer and on to the bearings. From the bearings,
the oil drains back to the manifold and separator under
the motor and then on to the oil tank.
Figure 28. Oil refrigerant pump
compressor lubrication system
Compressor lubrication system
Oil reclaim system
Motor cooling system
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
1. Motor coolant return to condenser (2.125 OD)
2. Oil tank vent to evaporator
3. Oil separator and tank vent manifold
4. Tank vent line
5. Condenser
6. eductors (0.375 OD)High pressure condenser gas to drive oil
reclaim
7. Oil return to tank
8. Oil tank
9. Oil cooler within economizer(0.625 OD coiled tubing)
10. (0.25 OD)Oil reclaim from evaporator (2nd eductor)
11. Liquid refrigerant to pump (1.625 OD)
12. Economizer
13. Oil supply to bearings (0.625 OD)
14. Purge
15. Compressor
16. Liquid refrigerant motor coolant supply (1.125 OD)
17. Liquid refrigerant to economizer
18. Liquid refrigerant to evaporator
19. Evaporator
20. Oil reclaim from suction cover (1st eductor)(0.25 OD)
RELEASED 10/Mar/2020 06:59:20 GMT
