070.250-IOM (APR 11)
Page 12
408 MM ROTARY SCREW COMPRESSOR
INSTALLATION
HOLDING CHARGE AND STORAGE
Every 408 mm compressor is pressure and leak tested at the
Johnson Controls–Frick factory and then thoroughly evacu-
ated and charged with dry nitrogen to ensure its integrity
during shipping and short term storage prior to installation.
All compressors must be kept in a clean, dry location to
prevent corrosion damage. Compressors that will be stored
for more than two months must have their nitrogen charge
checked periodically (see pages in GENERAL INFORMATION
for complete instructions).
WARNING
Holding-charge shipping gauges (if mounted) are rated
for 30 psig and are for checking the shipping charge
only. They must be removed before pressure testing
and operating the system. Failure to remove these
gauges may result in catastrophic failure of the gauge
resulting in serious injury or death.
Access valves are bronze and they must be replaced with
steel plugs when package is assembled.
CAUTION
THIS EQUIPMENT HAS BEEN PRESSURIZED WITH
NITROGEN GAS. TEMPORARY VALVES & GAUGES
HAVE BEEN INSTALLED.
1. RELIEVE PRESSURE PRIOR TO OPENING LINES OR
MAKING FIELD CONNECTIONS.
2. REMOVE CHARGING VALVES OR GAUGES PRIOR
TO PRESSURIZING SYSTEM.
3. REFER TO INSTALLATION OPERATION AND MAINTE-
NANCE MANUAL FOR ADDITIONAL INFORMATION.
ESCAPING GAS MAY CAUSE INJURY
RIGGING AND HANDLING
The compressor can be moved with rigging, using a crane
or forklift, by hooking into the two lifting rings on the rotor
housing. The compressor lifting rings shall only be used to
lift the compressor itself. See Figures 3 and 4.
LIFTING RINGS
Figure 3 - Lifting Rings
FOUNDATION
Each 408 mm Rotary Screw Compressor is shipped mounted
on a wooden skid, which must be removed prior to unit
installation.
CAUTION
Allow proper spacing for servicing (see Dimensional
Outline Drawing).
The first requirement of the compressor foundation is that
it must be able to support the weight.
408S
13,960 lb
408L
15,580 lb
408XL
16,615 lb
NOTICE
Weights are for standard compressor in Ductile Iron.
Contact factory for weights of optional models.
Screw compressors are capable of converting large
quantities of shaft power into gas compression in a relatively
small space. The compression process creates relatively
high frequency vibrations that require sufficient mass in the
base to effectively dampen them.
The best insurance for a trouble-free installation is to firmly
anchor the compressor to a suitable foundation using
proper bolting and by preventing piping stress from being
imposed on the compressor. Once the compressor is rigged
into place, its feet must be shimmed to level it. There must
be absolutely no stresses introduced into the compressor
body due to bolting of the feet and flanges.
In any screw compressor installation, suction and discharge
lines should be supported in pipe hangers (preferably within
2 feet of vertical pipe run) so that the lines won’t move if
disconnected from the compressor. See table for Allowable
Flange Loads.
ALLOWABLE FLANGE LOADS
NOZ.
MOMENTS (ft-lbf)
LOAD (lbf)
SIZE
AXIAL VERT. LAT. AXIAL VERT. LAT.
NPS
M
R
M
C
M
L
P
V
C
V
L
1
25
25
25
50
50
50
1.25
25
25
25
50
50
50
1.5
50
40
40
100
75
75
2
100
70
70
150
125
125
3
250
175
175
225
250
250
4
400
200
200
300
400
400
5
425
400
400
400
450
450
6
1,000
750
750
650
650
650
8
1,500 1,000 1,000 1,500
900
900
10
1,500 1,200 1,200 1,500 1,200 1,200
12
1,800 1,500 1,600 1,500 1,400 1,200
14
2,000 1,800 1,800 1,700 2,000 2,000
16
2,250 2,000 2,000 1,700 2,200 2,000
CUSTOMER CONNECTIONS
As a minimum you must connect to the following locations
in addition to suction and discharge.
SB-2
Inlet Bearings and Balance Piston
SB-3
Discharge Bearings and Shaft Seal
SM-1
Main oil injection
SC-13 Manifold block pressure (on manifold block)
