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9. Avoid any body contact with the refrigerant, it may lead to a frostbite (R134a boiling point is
-26°С, R1234yf boiling point is -30°С).
10. It is strongly recommended to use protective gloves and glasses.
11. Any refrigerant is a colorless and odorless gas which is heavier than air. Entering the
atmosphere, it can cause asphyxiation or heart rhythm disorders. That is why, the Test Bench
should be used in well-ventilated premises only. Available exhaust units in the room must be
switched on.
12. Refrigerant R-1234yf is a highly flammable gas. Take extra care when working with this
refrigerant.
13. Open flame sources are allowed nowhere near the test bench operating area. Smoking near
the Test Bench is prohibited. A regular fire-extinguishing appliance is a must.
14. If protective caps of the filling fittings cannot be easily unscrewed, there is a risk of injury due
to the valves poor tightness.
2.2 Preparation of a compressor for diagnostics
Prepare the compressor for diagnostics as follows:
1.Clean the compressor surface from dirt with a compressed air stream.
2.Unscrew the oil filling cap. Drain the oil into a clear container.
Figure 18. Monitoring of compressor oil condition
Operation manual - test bench MS111
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