This manual is for the application of the Carlyle 06T
semi-hermetic and 05T open drive twin screw com-
pressors. The operational limits, required accessories
and operational guidelines are contained in this man-
ual and must be complied with to stay within the
compressor warranty guidelines.
The Carlyle 06T and 05T screw compressors are
gear-driven twin screw compressors. The gear drive
yields the benefits of light weight and small cubic vol-
ume. One of the key features of the Carlyle screw
compressor is that all the semi-hermetic models have
the same physical dimensions and port locations, as
do all the open drive models.
The compressors range between 15 and 75 nominal
horsepower, and are designed for use in commercial
refrigeration, process cooling, environmental cham-
ber, and air conditioning applications.
The 06T and 05T screw compressors are an addition
to Carlyle’s line of soft compression technology
(rotary and scroll). Soft compression technology
yields the benefits of smooth continuous pumping of
refrigerant with minimal vibration. The potential for
refrigerant leaks is reduced and rack vibration
is minimized. The addition of variable speed drives to
these compressors is an ideal complement for very
tight capacity control over a wide speed range.
Unlike reciprocating compressors, most models
can run up to 70 Hz yielding extra capacity
that may be needed on above design condition days.
This application guide is intended to set the required
guidelines of system design and operation to maxi-
mize the reliability of the Carlyle 06T and 05T twin
screw compressors. For applications outside the
parameters listed in this guide, please contact Carlyle
Application Engineering.
Unless otherwise noted, all information contained in
this application guide applies to both the 06T and
05T models.
Introduction
Summary of Control Points
Oil System:
Maximum oil temperature 190°F (88°C)
entering compressor
Minimum oil temperature 80°F (27°C)
entering compressor
Maximum oil pressure 45 Psi (3 Bar) Cut-Out
differential across the 25 Psi (1.6 Bar) Alarm
oil filter
Minimum oil pressure
differential across each
compressor (oil inlet pressure
to suction pressure) 45 Psi (3 Bar) Cut-Out
Motor Cooling Control Per Compressor:
Refer to LonCEM/CEM Control Parameters Chart
and Appendixes A & B.
Discharge Temperature Control Per
Compressor:
Refer to LonCEM/CEM Control Parameters Chart
and Appendixes A & B.
Reverse Rotation Protection Per Compressor:
LonCEM (Carlyle Electric Module) solid-state
electronic module with integral reverse rotation
protection.
— or —
Manual Reset Low Discharge Pressure Cut-Out
(1/4" Tubing Conn.) 10" Vacuum (.33 bar)
— or —
Carlyle Approved Line/Load Phase Monitor
(Optional)
Note: One of the above methods of reverse rotation
protection is required.
Head Pressure Control:
Minimum head pressure must be 45 psi (3 bar)
above suction pressure plus expected pressure drop
in the oil system (including the maximum
pressure drop across the oil filter that is designed into
the oil system before a filter change). If the
system is set to cut-out compressors at 45 psid
(3 bar) across the oil filters, then 90 psid (6 bar) plus
any losses in the oil system between the
separator and compressor is the required pressure
differential from suction to discharge.
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