Engineering manual - SAB 193-233-283 S A-frame (including ATEX)
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11.9
Visual assessment
When pouring the sample into a clean transparent glass bottle or test-tube and holding it up
against a clear light source, it is easy to assess the quality. The oil can also be compared to a
fresh oil sample of the same make and grade.
Oil approved by visual assessment must:
•
be clear and shiny
•
not contain any visible particles
•
feel viscous, smooth and greasy when rubbing a drop between two fingers.
If the oil cannot be approved by visual assessment, charge with new oil or send a sample to a
laboratory for analysis.
Warning!
If the oil sample is poured into a glass bottle, this must not be hermetically sealed until all the
refrigerant in the oil sample has evaporated. Refrigerant in the oil may produce excess pres-
sure in the bottle with subsequent risk of explosion. Never fill up a bottle completely. Do not
send glass bottles by mail, use purpose-made plastic bottles. Please see below.
11.10
Analytical evaluation
Naturally, the oil sample can be analysed by the oil supplying company. As a
special offer to
our customers
, Johnson Controls Denmark has developed an analytical concept, so that we
are able to analyse all oil makes. This will mean a uniform reporting of the results.
The analysis will determine the following:
•
Whether or not the oil can still be used, if necessary, after filtering.
•
Whether solid particles present in the oil originate from bearings or other components
exposed to wear and tear, in which case the compressor must be inspected.
Each report will include the corresponding measuring results from
the previous three oil
analyses
. This way, it is possible to follow up on the state of both the oil and the compressor
from one analysis to the next.
Procedure
•
A form set with a plastic sample bottle and a dispatching envelope can be requested
from your local Johnson Controls representative.
•
The oil sample must be drained from the cleaned oil drain valve into the sample bottle.
Screw the lid on loosely, and let the bottle stand for a few hours to make refrigerant con-
tained in the oil sample evaporate before sending the sample to the laboratory.
Do not
fill up the bottle completely.
•
Please follow the
Sampling and shipping instructions
enclosed with the form set, in
which the address of the laboratory in Holland is also stated.
11.11
Analysing the oil
The following table lists a number of average values that can be applied in practice. However,
be on the alert whenever the results of the analyses approach these values. In some cases,
the water content of 100 ppm in HCFC plants may be too much and thus lead to Cu-plating in
the shaft seal.