Carlyle 05T-033 Manuel d'application - Page 11

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Oil Cooling Capacity

Fan Speed

Ambient Air Temperature

KH51ZZ181

KH51ZZ182

KH51KK183

*Maximum Number of Compressors Based on Oil Cooler Pressure Drop of Less Than 6 PSID (.41 bar)

3.8

Oil Cooler Selection

Oil coolers are required for 06T compressors where the oil

temperature can exceed 190°F (88°C) and for 05T com-

pressors where it can exceed 180°F (82°C). The CARWIN

selection software should be used to determine operating

conditions where this will occur. For initial reference, the op-

erating envelopes in Section 2.1 may be used as an initial

reference.

The oil cooler should be sized based on an oil flow rate of

approximately 2 gallons per minute (7.6 liters/minute) per

compressor. However, it should be noted that the actual oil

flow rate will vary based on the specific operating condition.

Oil cooler loads may be obtained from the CARWIN selec-

tion software. With an oil cooler, the maximum oil tempera-

ture leaving the oil cooler is 170°F (77°C). Systems using

external oil coolers also require controls that prevent the oil

temperature from dropping below 80°F (27°C).

Acceptable means of control are fan cycling or oil cooler by-

pass or mixing valves. Mixing valves are recommended for

any oil coolers that are integrated into the system condens-

er coil. For direct expansion oil coolers rejecting heat into

the refrigeration circuit caution must be taken to ensure that

the return gas temperature is within operating guidelines.

3.9

Oil Filter

Carlyle screw compressors are designed with rolling ele-

ment bearings to provide exceptional life. Oil to the bearings

must pass through a 3 micron filter which is required on all

Carlyle screw compressor systems.

NOTE: Use of the Carlyle 3 micron filter element is required.

Use of a non-Carlyle- approved filter element will void com-

pressor warranty. The use of a second redundant filter in

parallel is recommended to allow for servicing of one filter

while the other maintains the operability of the equipment.

95°F

Maximum 2

32.1

compressors

Maximum 3

69.1

compressors

Maximum 4

102.6

compressors

Maximum 5

134.1

compressors

kBtu/hr

60Hz

100°F

105°F

110°F

30.6

29.9

27.6

65.7

62.4

59.1

97.7

92.8

87.9

127.7

121.3

114.9

If more than five compressors are fed by the oil system,

three parallel oil filter elements (2 for operation, 1 for redun-

dancy) should be used to avoid excessive pressure drop

through the filter elements. The oil filter should be located

downstream from any oil coolers, as close to the compres-

sors as possible.

Oil Filter Pressure Drop Protection:

LonCEM protection

Carlyle recommends maximum allowable pressure drop

across the oil filters of 45psid (3bar). Compressors should

be shutdown above this limit. Carlyle also recommends an

alert (shutdown not required) when the pressure drop rises

above 25psid (~1.5bar).

3.10 Oil Sump Heaters

The heater must be energized during the system off cycle if

used. This is required in all air conditioning systems and is

recommended in refrigeration systems to keep refrigerant

out of the oil sump during compressor off cycles. Carlyle

typically recommends flexible heaters that are applied on

the outside of the oil separator shells. Carlyle recommends

500W heaters for shells 12 inches and smaller and 100W

for heaters larger than 12 inches. Direct immersion heaters

may also be used. Carlyle advises caution with these im-

mersion heaters, localized temperatures surrounding the

heater element should not create issues with the lubricant.

3.11 Oil Sight Glass

A sightglass is required in the main oil line. The sightglass

must be located after the oil filters and just prior to the first

compressor on a multiple compressor rack. To aid service

personnel in verifying oil flow to any given compressor

Carlyle recommends a sightglass be placed in each branch

oil line between the compressor and its oil solenoid.

kW/hr

50Hz

35°C

38°C

41°C

9.4

8.4

18.7

17.8

16.9

27.8

26.5

25.2

26.2

34.4

32.7

— or —

43°C

8.0

16.0

23.9

30.1