RWB II ROTARY SCREW COMPRESSOR UNITS
MAINTENANCE
070.200-IOM (DEC 11)
Page 34
MAINTENANCE SCHEDULE
This schedule should be followed to ensure trouble‑free operation of the compressor unit.
OPERATING LOG
The use of an operating log, as included in this manual, permits thorough analysis of the operation of a refrigeration system by
those responsible for its maintenance and servicing. Continual recording of gauge pressures, temperatures, and other pertinent
information, enables the observer and serviceman to be constantly familiar with the operation of the system and to recognize
immediately any deviations from normal operating conditions. It is recommended that readings be taken at least every four hours.
See Table of Contents for "OPERATING LOG SHEET".
FREQUENCY OR HOURS OF OPERATION (MAXIMUM)
MAINTENANCE
200
1000
5000
8000
10,000
15,000
20,000
25,000
30,000
35,000
40,000
45,000
50,000
55,000
60,000
65,000
70,000
75,000
80,000
85,000
90,000
95,000
Change Oil As Directed By Oil Analysis
Oil Analysis
n
Every 6 Months
Replace Filters
n
n
n
n
n
n
n
n
n
n
n
Clean Oil Strainers
n
n
n
n
n
n
n
n
n
n
n
Clean Liquid Strainers
n
n
n
n
n
n
n
n
n
n
n
Replace Coalescers
n
n
n
Check and Clean Suction Strainer
n n n
n
n
n
n
n
n
n
n
n
Check Alignment
n
n
n
n
n
n
n
n
n
n
n
Check Coupling (a)
n
n
n
n
n
n
n
n
n
n
n
Suction & Disch Flange Bolts (b)
n n n n n n n n n n n n n n n n n n n n n n
Vibration Analysis (c)
n
Every 6 Months, More Frequently If Levels Increase
Replace Shaft Seal When Leak Rate Exceeds 7 ‑ 8 Drops Per Minute
a. Check bolts, shim packs, center inserts, keys, and all bolt torques.
b. Verify tightness of bolts on suction and discharge flanges. See table below for torque requirements.
c. Vibration measurement must be carried out continuously to obtain optimum preventative control on bearings. If not continuously controlled,
then every 6 months, more frequently if levels increase.
NOTE:
1. The bolt torque requirements for the compressor flange to separator flange are based on:
a. Gaskets: Garlock
®
Blue‑Gard
®
3300
b. Bolts: class 8.8 or stronger hex head bolts, lightly oiled and clean
TDSH Flange Bolt Torque
RWBII MODEL
Compressor
Model
Discharge Flange to
Separator Flange Suction Flange
Bolt Size (in.) Torque (ft-lb) Bolt Size (in.) Torque (ft-lb)
60 163S M20 X 2.5 100 M16 X 2.0 120
76 163L M20 X 2.5 100 M16 X 2.0 120
100 193S M20 X 2.5 140 M20 X 2.5 180
134 193L M20 X 2.5 140 M20 X 2.5 160
177 233S M20 X 2.5 160 M20 X 2.5 160
222 233L M20 X 2.5 160 M20 X 2.5 200
270 233XL M20 X 2.5 160 M22 X 2.5 220
316 283S M22 X 2.5 230 M22 X 2.5 220
399 283L M22 X 2.5 230 M22 X 2.5 220
480 283SX M22 X 2.5 230 M24 X 3.0 220
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