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1.5 Ambient Conditions
The screw compressor is designed for the following speci-
fied ambient temperature ranges:
Non-Operating
Start-up
Operating
1.6 Installation Environment
The intended installation modes for the screw compressor
are: Machine Rooms—Enclosed Atmosphere External En-
vironment—Sheet Metal Enclosure
NOTE: The electrical terminal box is not approved for exter-
nal applications.
1.7 Pressure Relief Valve
All compressor models contain an automatic reset high
pressure relief valve. The pressure relief valve is located in-
side the compressor and will internally relieve the compres-
sor discharge to the compressor suction at a pressure differ-
ential of 400 psi (27.6 bar). The relief valve is not field
serviceable.
1.8 Discharge Check Valve
All compressor models are supplied with an internal dis-
charge check valve. This check valve prevents the reverse
flow of refrigerant through the compressor during compres-
sor off cycles. A check valve in the discharge line is not re-
quired for parallel applications. It may be required for pump
down on single compressor systems. The discharge check
valve is field serviceable.
-40°F To 130°F
(-40°C To 54°C)
-40°F To 130°F
(-40°C To 54°C)
-25°F To 130°F
(-32°C To 54°C)
1.9 Compressor Inlet Screens
Filter screens are applied at all locations where liquid or gas
enters the compressor, i.e., suction, economizer and oil
connections. For systems that operate below -25°F (-32°C),
it is recommended that the suction screen be removed after
48 hours of system startup as the viscous oil can damage
the screen. The compressor inlet screens are field service-
able and available through Carlyle distribution.
1.10 Service Valves
Suction and discharge connections will interface with the
2-1/2 in. bolt pattern service valves currently being used on
the Carlyle reciprocating compressors. Rotalock
valves are used for the economizer line shut off. The line
sizes are as follows:
Connection
Suction
Discharge
Economizer
All 05T compressors and 06T compressors between 65cfm
and 108cfm must use a flange at the discharge connection
with an in-line ball valve for compressor isolation. With the
exception of the 06TA660008 valves (now obsolete), stan-
dard 90-degree compressor isolation valves must not be
used on the discharge of these 65, 78, 88 and 108cfm com-
pressors.
1.11 Condenser Pressure Control
Large fluctuations in head pressure may result in very poor
oil separation which may result in nuisance oil level switch
tripping. The condenser pressure must be controlled such
that fluctuations are gradual. Carlyle screw compressors
must always be applied with a minimum of one condenser
fan (preferably variable speed) active and a means of mini-
mum head pressure control for low ambient operation.
®
service
Connection Size
MAX.
MIN.
5
1
1-
/
"
1-
/
"
8
8
5
1
1-
/
"
1-
/
"
8
8
7
7
/
"
/
"
8
8
5
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