To determine the performance of a Unicla UWX compressor in a specific application, the following
Compressor Operation Analysis Report will assist in the collection of the necessary data.
Causes of excessive superheat (discharge)
It is important to note that superheat levels increase as a normal condition
• at higher compressor speeds
• at higher ambient temperature
Abnormal superheat generation may be caused by one or more of the conditions described below
and exaggerated under high heat loads.
Low charge rates
There are two reasons for insufficient flow of refrigerant to the compressor to provide adequate
cooling:
• the flow (volume) is reduced giving less cooling medium
• excessive low side superheating means the suction vapours are no longer cold
The result is not only a low quantity of cooling vapours, but they are no longer cold.
10.
Normal Superheat/Discharge Line Temperature Chart
330, 440 and 550 series compressors
1800
73
15.5
58
1.86
8.9
15
2200
81
15.5
58
1.86
8.9
23
3500
98
15.5
58
1.86
8.9
40
200 series compressors
1800
77
15.5
58
1.86
8.9
19
2000
78
15.5
58
1.86
8.9
20
3500
93
15.5
58
1.86
8.9
35
170 series compressors
1800
75
15.5
58
1.86
8.9
17
2200
78
15.5
58
1.86
8.9
20
3500
83
15.5
58
1.86
8.9
25
150 series compressors
1800
77
15.5
58
1.86
8.9
19
2200
81
15.5
58
1.86
8.9
23
3600
88
15.5
58
1.86
8.9
30
RPM
Discharge
Temp ˚C
Condensing
Pressure Kgf/cm
2
Condensing
Temp ˚C
Evaporator
Pressure Kgf/cm
2
Compressor
Inlet Temp ˚C
Superheat
(discharge line)
