4
Compressor Displacement (Low/Medium
Temperature Models). R-404A, R-407A, R-407C,
R-407F, R-448A, R-449A, and R-507A
See Tables 3 and 4.
Table 3 — Low Temperature (Refrigeration) Models
Table 4 — Medium Temperature Models
Standard Features
See Fig. 1-4 for physical data and connection information.
Discharge Check Valve
The discharge check valve is an axial movement type
located within the compressor. The check valve i
s field ser-
viceable by removing the oil separator or discharge line to
access the valve in the compressor discharge housing.
Pressure Relief Valve
The Paragon screw compressors have an internal relief
device which is designed to relieve pressure from the
high side to the low side of the compressor.
Suction and Economizer Screens
To increase the reliability of the compressor, a screen has
been incor
porated as a standard feature into the suction
inlet and economizer inlet of the compressor. The suction
inlet screen is installed into the suction inlet of each com-
pressor. The economizer inlet screen is supplied in the
economizer flange package (which is included in the
compressor kit 06TT660093). Refer to the economizer
flange Installation Instruction document for more details.
Slide Valve Unlo
ading System
All Paragon screw compressors utilize a continuous slide
valve unloading system. The slide valve decreases the
compressor's capacity by reducing the amount of com-
pression performed by the screw rotors. It is infinitely
variable down to approximately 30% of full load capacity
for air-cooled models and approximately 15% of the full
load capacity for water-cooled models. These percent-
a
ges of unloading are based on operation at typical rating
conditions and may be different at other operating condi-
tions.
Variable Speed for Capacity Control
The paragon compressor has been qualified to operate
with a variable frequency drive (VFD) for all low, medium,
and high temperature applications. The VFD speed appli-
cation range is 30 to 60 Hz. The compressor slide valve
should remain in the
fully loaded position while the VFD
is controlling compressor capacity between 30 to 60 Hz.
The slide valve may be used to reduce compressor
capacity below 50% (30 Hz) if required. Recommenda-
tions and requirements for these applications are pro-
vided in Section 7.0.
MODEL
NUMBER
NOMINAL
HORSEPOWER
DISPLACEMENT
(CFM at 60 Hz)
06TSR137 60 137
06TSR155 75 155
06TSR186 75 186
06TTR266 120 266
06TTR301 150 301
06TTR356 150 3
56
MODEL
NUMBER
NOMINAL
HORSEPOWER
DISPLACEMENT
(CFM at 60 Hz)
06TSM137 75 137
06TSM155 75 155
06TTM266 150 266
06TTM301 150 301
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