HPS Rotary Screw Compressor Units
070.700-IOM (MAR 21)
Page 33
Maintenance
Figure 36: Oil sampling valve
Locknut
Locknut
Valve Cap
& Spout
Valve Cap
& Spout
DO NOT
UNTHREAD
VALVE!
Oil sampling procedure
Warning
Exercise extreme caution in the vicinity of operating
equipment. Skin contact with lube oil or inhalation
of vapors can cause serious injury or death, consider
gloves and eye protection.
Sample hot, active fluid while the equipment is operating.
Sample after 30 min of compressor operation.
1. Unthread the
oil sampling valve cap and locknut. See
Caution
Do not unthread the valve from the filter housing
or piping because this may result in an uncontrolled
release of oil.
2. Unthread the bottle cap and carefully position under
the oil sampling valve spout. Place the spout inside the
bottle.
3.
Push the oil sampling valve to open and release to
close (spring actuated, see
, inset). Fill the
bottle 3/4 full.
4.
Retighten bottle cap, sampling valve cap and locknut.
Note that the locknut prevents accidental release of oil.
5.
Record all necessary sample data and identification
on forms and labels and send promptly to the lab for
results.
Operating log
The use of an operating log, as shown in the
, permits thorough analysis of the opera
-
tion 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 condi
-
tions. Take the readings at least every 4 hours.
Maintenance program
In order to obtain maximum compressor unit perform ance
and ensure reliable operation, follow a regular main-
tenance program.
Check the compressor unit daily for leaks, abnormal
vibration,
noise, and correct operation, and maintaining a
log. Perform the initial oil analysis and vibration analysis
at start-up and continue as indicated in the
Vibration analysis
Periodic vibration analysis can be useful in detecting bear
-
ing wear and other mechanical failures. If using vibration
analysis as a part of your preventive main tenance pro-
gram, take the following guidelines into consideration:
• Always take
vibration readings from exactly the same
places and at exactly the same percentage of load.
•
Use vibration readings taken from the new unit at start-
up as the base line reference.
•
Evaluate vibration readings carefully as the instru ment
range and function used can vary. Findings can be easily
misinterpreted.
•
Vibration readings can be influenced by other equip-
ment operating in the vicinity or connected to the same
piping as the unit.
Oil quality and analysis
High quality refrigeration oil is necessary to ensure
compres sor longevity and reliability.
Oil quality rapidly
deteriorates in refrig eration systems containing
moisture,
air, or other contaminants. In order to ensure the quality
of the refrigera tion oil in the com pressor unit, perform the
following steps:
Warning
Do not mix oils of different brands, manufacturers, or
types. Mixing of oils may cause excessive oil foam-
ing, nuisance oil level cutouts, oil pressure loss, gas
or oil leakage and catastrophic compressor failure.
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 Frick
Oil publication
160.802-SPC
for guidance.
Only use Frick oil
filter elements or warranty claim
may be denied.
1.
Participate in a regular, periodic oil analysis program to
maintain oil and system integrity. Oil analysis kit part
number: 333Q0001853.
2.
Take oil samples for analysis after the oil filter. A 1/4 in.
purge valve is provided in the oil filter canister head.
