070.550-IOM (JUN 2016)
Page 4
NGC GAS ROTARY SCREW COMPRESSOR
INSTALLATION - OPERATION - MAINTENANCE
OIL PUMP
A jackshaft driven, full-time oil pump is provided mounted
on the compressor. The oil pump will provide sufcient oil
pressure for low differential pressure applications. Oil being
supplied to the compressor from the oil separator is at
system discharge pressure. Within the compressor, oil
porting to all parts of the compressor is vented back to a
location in the compressor’s body that is at a pressure lower
than compressor discharge pressure. All oil entering the
compressor is moved by the compressor rotors out the
compressor outlet and back to the system oil separator.
The oil pump is used to supply oil to the gears, bearings,
balance piston, shaft seal and for main oil injection for the
NGC 100 and 150 models. Other models, depending on
operating conditions, use differential pressure to supply main
oil injection. Also depending on the operating conditions, the
boost in pressure from the oil pump can be used to reduce
the axial bearing loads and to increase L
10
life (CoolWare
™
provides a warning when bearing life is too short).
COMPRESSOR DELIVERY
JOB INSPECTION
Immediately upon delivery examine all crates, boxes and
exposed compressor and component surfaces for damage.
Unpack all items and check against shipping lists for any
discrepancy. Examine all items for damage in transit.
TRANSIT DAMAGE CLAIMS
All claims must be made by consignee. This is an ICC re-
quirement. Request immediate inspection by the agent of
the carrier and be sure the proper claim forms are execut-
ed. Report damage or shortage claims immediately to
Johnson Controls-Frick Sales Administration Department,
in Waynesboro, PA.
COMPRESSOR AND UNIT IDENTIFICATION
Each compressor has an identication data plate, containing
compressor model and serial number mounted on the
compressor body.
NOTICE
When inquiring about the compressor or unit, or
ordering repair parts, provide the MODEL, SERIAL, and
Johnson Controls - Frick SALES ORDER NUMBERS
from these data plates. See Figure 1.
Figure 1 - Identication Data Plate
Rotary screw compressor serial numbers are dened by the
following information:
EXAMPLE: 10240A90000015Z
GLOBAL ADDITIONAL
PLANT DECADE MONTH YEAR SEQ NO. REMARKS
1024 0 A 9 0000015 Z
Month: A = JAN, B = FEB, C = MAR, D = APR, E = MAY, F =
JUN, G = JUL, H = AUG, K = SEP, L = OCT, M = NOV, N = DEC.
Additional Remarks: R = Remanufactured; Z = Deviation from
Standard Conguration.
NGC 283
SERIES ROTOR DIAMETER (
mm
)
NGC 193 (Models 100, 150)
NGCH 233 (Models 200, 250)
283 (Model 300)
355 (Models 400, 450)
The installed gear can be read by the model number, i.e.
NGC 150A. If you change the gear, please make records of
the change and mark the compressor with the actual gear
ratio (A, B, C, D, E or F). See Figure 2.
Figure 2 - Gear Ratio Data Plate