070.750-IOM2 (JAN 21)
Page 11
HPS 273 ROTARY SCREW COMPRESSOR
INSTALLATION
Notice
The Frick oil charge shipped with the unit is the best
suited lubricant for the conditions specified at the
time of purchase. If there is any doubt due to the re-
frigerant, operating pressures, or temperatures, refer
to
160.802-SPC, Compressor Oil Specifications
.
Oil pump
If your HPS compressor application requires an oil pump,
mount a strainer upstream because this can protect the
pump. Frick supplied pumps are a positive displacement
gear type that must have a safety relief valve to ensure
the oil pressure does not go above 3.45 bar (50 psi) com-
pressor discharge pressure for all models.
Caution
If oil pressure exceeds 3.8 bar (55 psi) above com-
pressor discharge it could cause catastrophic com-
pressor failure due to axial bearing failure. Refer to
CoolWare for your application’s requirements.
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 setting the motor, 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
HPS compressors are arranged for direct motor drive and
require a flexible drive coupling to connect the compressor
to the motor. Coupling must be suitable for variable speed.
The HPS 273 models use a keyless drive shaft.
For a foot-mounted motor, it is essential to properly align
the coupling to ensure proper bearing and seal perfor-
mance:
1. Select and install the coupling so that it does not trans-
mit any axial load to the compressor shaft.
2. Set up the minimum distance between the compres-
sor shaft and motor shaft to allow for seal removal (see
outline drawings).
3. Coupling must be able to take up any misalignment
between the motor and compressor. It is critical to the
life of the shaft seal that misalignment is kept to the
minimum possible value. Follow the coupling manu-
facturer’s guidelines for checking and correcting any
misalignment.
Coupling alignment requirements
(foot-mounted only)
1. Perform a coupling alignment before start-up.
2. After installing the compressor on the job site, check
alignment again and if necessary, correct before start-
up.
3. After a few hours operation, you must check the align-
ment while the package is still hot. Correct hot align-
ment is critical to ensure the life of the shaft seal and
compressor bearings.
Note:
Maximum radial runout is 0.004 in. total indicator
reading.
Maximum axial runout is 0.004 in. total indicator
reading.
4. Use a dial indicator or another appropriate measuring
device to determine the Total Indicator Runout.
Table 5: Allowable flange loads
Nozzle
size NPS
Moments, ft-lbf (N.m)
Load, lbf (N)
Axial - M
R
Vert. - M
C
Lat. - M
L
Axial - P
Vert. - V
C
Lat
. -
V
L
1
25 (34)
25 (34)
25 (34)
50 (222)
50 (222)
50 (222)
1.25
25 (34)
25 (34)
25 (34)
50 (222)
50 (222)
50 (222)
1.5
50 (68)
40 (54)
40 (54)
100 (445)
75 (334)
75 (334)
2
100 (136)
70 (95)
70 (95)
150 (667)
125 (556)
125 (556)
3
250 (339)
175 (237)
175 (237)
225 (1,001)
250 (1,112)
250 (1,112)
4
400 (542)
200 (271)
200 (271)
300 (1,334)
400 (1,779)
400 (1,779)
5
425 (576)
400 (542)
400 (542)
400 (1,779)
450 (2,002)
450 (2,002)
6
1,000 (1,356)
750 (1,017)
750 (1,017)
650 (2,891)
650 (2,891)
650 (2,891)
8
1,500 (2,034)
1,000 (1,356)
1,000 (1,356)
1,500 (6,672)
900 (4,003)
900 (4,003)
10
1,500 (2,034)
1,200 (1,627)
1,200 (1,627)
1,500 (6,672)
1,200 (5,338)
1,200 (5,338)
14
2,000 (2,712)
1,800 (2,440)
1,800 (2,440)
1,700 (7,562)
2,000 (8,896)
2,000 (8,896)
