Frick SGXH-4021 - Compressor; Compressor Oil; Motor Mounting Using Tunnel; Motor Mounting (Foot Mounted Only)

070.650-IOM (JUL 19)
Page 30
SGC/SGX ROTARY SCREW COMPRESSOR
INSTALLATION
block checked to get the discharge dew point temperature
for your application. Oil temperatures as high as 170°F can
be used to achieve the necessary discharge temperature to
prevent moisture from condensing in the oil separator. In
special applications, oil temperatures up to 250°F can be
possible with high dew point temperatures. Consult FRICK
engineering to address these special applications or for ad-
ditional natural gas compression information.
The main oil injection line that is connected to port SM-1
must have a regulating valve to permit adjustment of the
oilowtomaintainthedesireddischargetemperatureat
all times.
The use of a three-way mixing valve is recommended to
keep the oil temperature in the normal range of 120°F
to 140°F. The valve provides warm oil to the compressor
quickly, reducing the pressure drop caused by cold, viscous
oil.Thisensuresproperoilowandtemperatureoverthe
full range of operating conditions.
OIL FILTER(S)
UseoflterelementsotherthanJohnsonControls-FRICK
must be approved in writing by Johnson Controls-FRICK
engineering or a warranty claim may be denied. Ensure oil
lterspecicationisnohigherthanβ
10
= 75 with β
6
= 75
preferred. If the oil analysis shows particle counts exceeding
XX/XX/19as statedinISO 4406cleanlinesscode,a lter
change is required. If particle counts do not come down, an
oil change is required.
OIL HEATER(S)
Your package must be equipped with oil heaters that provide
sufcient heat to prevent condensation from occurring
during shutdown cycles.
COMPRESSOR OIL
Warning
DO NOT MIX OILS of different brands, manufacturers,
or types. Mixing of oils can cause excessive oil foaming,
nuisance oil level cutouts, oil pressure loss, gas or oil
leakage and catastrophic compressor failure. CoolWare
selects a specic FRICK oil for the refrigerant being
used. Depending on the application, a different oil can
be selected provided it is of the proper viscosity and
is compatible with the refrigerant and compressor
elastomers.
OIL PUMP
If your SGC compressor application requires an oil pump,
it is recommended that a strainer be mounted upstream to
protect it. FRICK supplied pumps are a positive displacement
gear type that must have a safety relief valve to ensure the
oil pressure is not greater than 50 psi above compressor
discharge pressure for all models.
Caution
If oil pressure exceeds 55 psi above compressor dis-
charge it could cause catastrophic compressor failure
due to male axial bearing failure. See CoolWare
™
for
your application’s requirements.
COMPRESSOR
Compressor rotation is clockwise when facing the end of
the compressor shaft.
Conrmthatthemotorcanrotatethecompressorclockwise
before installing the coupling.
Caution
To prevent injury or damage to components, and for
complete details regarding pressurized refrigerant vapor
transfer and recovery, see the current Installation-
Operation-Maintenance Manual for your unit.
MOTOR MOUNTING USING TUNNEL
Forspecicinstructionaboutmotormountingusingatun-
nel refer to publication 070.660-SM - Bare Rotary Screw
Compressor Replacement.
Notice
Refer to 070.660-SM - Bare Rotary Screw Compressor
Replacment manual, for motor mounting instructions.
Table 5: Motor tunnel bolt torque
Compressor
model
Screw size
Torque
ft-lb N⋅m
SGC 19XX M12 X 1.75 58 79
SGC 23XX M12 X 1.75 58 79
SGC 28XX M16 X 2.0 144 195
SGC 35XX M20 X 2.5 260 353
Note: No motor tunnel for the 408 mm compressors.
MOTOR MOUNTING (FOOT MOUNTED ONLY)
1. Thoroughly clean the motor feet and mounting pads of
grease,burrs,andotherforeignmattertoensurerm
seating of the motor.
2. Attach the motor to the base using bolts and motor
raising blocks, if required.
3. Weld the four kick bolts (not included with compressor)
into place so that they are positioned to allow
movement of the motor feet.
4. After the motor has been set, check to see that the
shafts are properly spaced for the coupling being used.
Check the appropriate Dimensional Outline drawing
for the minimum clearance required between the shaft
ends to change the shaft seal.
COMPRESSOR/MOTOR COUPLING REQUIREMENTS
SGC/SGX compressors are arranged for direct motor
driveand requireaexibledrivecoupling toconnectthe
compressor to the motor.
If you are using the Johnson Controls – FRICK motor mount,