2.2 Vapor Temperature Limits
Any application of screw compressors must
operate within the limits defined by the appli-
cation maps for the various refrigerants and
applications.
Vapor Temp. Min. Max.
Suction 10°F SH* 100°F
(6°C) (38°C)
Economizer Saturated** Non-
Vapor Economized
*SH = Superheat
**The maximum economizer pressure allowable is
175.3 psig (13.1 bar)
2.3 Minimum Oil Pressure Differential
A minimum pressure differential of 45 psi
(3 bar) is required between suction and oil
pressure (at the compressor). Applications
below this minimum range will require the
use of an external oil pump.
2.4 Operating Speed Ranges
The operating speed range for the screw com-
pressor is as follows for the different size range
compressors.
Model ft
3
/m
3
/ Min. Max.
No. min min Hz Hz
06T**033 33 0.93 50 70
06T**039 39 1.10 40 70
06T**044 44 1.26 35 70
06T**048 48 1.36 30 70
06T**054 54 1.53 30 70
06T**065 65 1.84 25 70
06T**078 78 2.21 20 68
06T**088 88 2.49 20 60
06T**108 90* 2.56* 20 50
* 50 Hz Applications only.
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