070.250-IOM (APR 11)
Page 13
408 MM ROTARY SCREW COMPRESSOR
INSTALLATION
Other connections are available for instrumentation and
service as noted on the Dimensional Outline drawing. The
electrical connections for the slide stop and the slide valve
transmitters and the solenoid valve coils must be connected
to your control system .
The oil supply system for the compressor must be designed
for a total pressure drop of no more than 15 psi with a new
oil filter element. This is critical for the proper operation of
the balance piston which is used to ensure the life of the
male axial bearing. Excessive pressure drop in the oil circuit
can also prevent proper operation of the slide valve and
slide stop pistons.
COMPRESSOR OIL
WARNING
DO NOT MIX OILS of different brands, manufacturers,
or types. Mixing of oils can cause excessive oil foam-
ing, nuisance oil level cutouts, oil pressure loss, gas or
oil leakage and catastrophic compressor failure. Cool-
Ware will select a specific Frick oil for the refrigerant
being used. Depending on the application, a different
oil can be selected provided it is of the proper viscos-
ity and is compatible with the refrigerant and com-
pressor elastomers.
OIL PUMP
If your 408 mm 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 that
the maximum oil pressure will not be exceeded.
CAUTION
Excess or improper oil pressure could cause catastroph-
ic 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
Confirm motor will rotate the compressor clockwise before
installing the coupling.
MOTOR MOUNTING (FOOT MOUNTED ONLY)
1. Thoroughly clean the motor feet and mounting pads of
grease, burrs, and other foreign matter to ensure firm
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 move-
ment 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.
Frick 408 mm compressors are arranged for direct motor
drive and require a flexible drive coupling to connect the
compressor to the motor.
If you are using the Johnson Controls–Frick motor mount,
the mount is machined to ensure that motor to compressor
alignment is in specification (see the above “MOTOR
MOUNTING” section for mounting details).
With a foot-mounted motor, it is essential that the coupling
be properly aligned to ensure proper bearing and seal
performance.
1. Coupling must be selected and installed so that it
doesn’t transmit any axial load to the compressor shaft.
2. Set up the minimum distance between compressor shaft
and motor shaft to allow for seal removal (see Outline
drawings).
3. Coupling must be able to take up any misalignment be-
tween motor and compressor. It is critical to the life of
the shaft seal that misalignment is kept to the minimum
possible value. Be sure to follow the coupling manufac-
turer’s guidelines for checking and correcting any mis-
alignment. See the next section for Johnson Controls–
Frick requirements.
COUPLING ALIGNMENT REQUIREMENTS
Coupling alignment must be performed prior to start-up.
After the compressor has been installed on the job site,
alignment must be checked again and if necessary corrected
prior to start-up. After a few hours operation, the alignment
must be checked while the package is still hot. Correct hot
alignment is critical to ensure the life of the shaft seal and
compressor bearings.
Maximum radial runout is .004” total indicator reading.
Maximum axial runout is .004” total indicator reading.
A dial indicator or another appropriate measuring device is
to be used to determine the Total Indicator Runout.
Indicator bracket sag must be checked as all brackets have
some flexibility. The best way to measure this is to attach
the dial indicator and bracket on a pipe at the coupling span
distance. Zero the indicator in the 12:00 position, and rotate
the pipe so the indicator is in the 6:00 position. The reading
on the indicator in the 6:00 position is the bracket sag. This
value must be included in the dial indicator readings when
affixed to the coupling for an accurate alignment.
OIL HEATER(S)
Your package must be equipped with oil heaters that provide
sufficient heat to prevent condensation from occurring
during shutdown cycles.
OIL FILTER(S)
Use of filter elements other than Johnson Controls-Frick
must be approved in writing by Johnson Controls-Frick
engineering or a warranty claim may be denied. Typical oil
filter specification
β
5
= 75 according to ISO 4572 is required
to obtain the recommended oil cleanliness class 16/14/11
according to ISO 4406.
