Start-Up & Operation; Strength-Pressure Test; Compressor Tightness Test; System Evacuation - Emerson Copeland Scroll YH04K1E Application Manuallines

5 Start-up & operation
WARNING
Diesel effect! System explosion! The mixture of air and oil at high
temperature can lead to an explosion. Avoid operating with air.
WARNING
Air/flammable refrigerant mixture! Creation of a flammable atmosphere!
Make sure the atmosphere is non-flammable before starting the system.
Ensure that the system contains only refrigerant.
IMPORTANT
Oil dilution! Bearing malfunction! It is important to ensure that new
compressors are not subjected to liquid abuse. It is mandatory to have a
crankcase heater installed if the refrigerant charge exceeds 1.54 kg for
compressors YH04K* & YH09K* and 1.93 kg for compressors YH11K* &
YH16K*. Turn the crankcase heater on 12 hours before starting the
compressor.
5.1

Strength-pressure test

WARNING
High pressure! Personal injuries! Consider personal safety requirements
and refer to test pressures prior to test.
CAUTION
System contamination! Bearing malfunction! Use only dry nitrogen for
pressure testing. DO NOT USE other industrial gases.
The compressor has been strength-pressure tested in the Emerson factory according to EN 14276-
1 and EN 60335-2-34 standards. Therefore, it is not necessary for the manufacturer/installer to
strength-pressure test the compressor on the assembly/system.
5.2

Compressor tightness test

WARNING
High pressure! Personal injuries! Consider personal safety requirements
and refer to test pressures prior to test.
CAUTION
System contamination! Bearing malfunction! Use only dry inert gases (for
example nitrogen) for leak testing. DO NOT USE other industrial gases.
The compressor has been leak-pressure tested in the Emerson factory. Therefore, it is not necessary
for the system manufacturer/installer to leak-pressure test the compressor on the assembly/system.
Any modification on compressor connections can have an impact on the compressor tightness.
Always leak-pressure test the compressor after opening the system or modifying the connections.
Never add refrigerant to the test gas (as leak indicator).
5.3

System evacuation

Before the installation is put into commission, it has to be evacuated with a vacuum pump. The
vacuum pump and all tools have to be approved for A2L refrigerant/air mixture. The installation
should be evacuated down to an absolute pressure of 0.3 mbar. Proper evacuation reduces residual
moisture to 50 ppm. During the initial procedure, suction and discharge shut-off valves on the
compressor remain closed. The installation of adequately sized access valves at the furthest point
from the compressor in the suction and liquid lines is advisable. The pressure must be measured
using a vacuum pressure gauge on the access valves and not on the vacuum pump; this serves to
avoid incorrect measurements resulting from the pressure gradient along the connecting lines to the
pump.
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