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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 a defined value –
see Table 8. 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.
IMPORTANT
System contamination! Bearing malfunction! Use only dry nitrogen for
pressure testing. DO NOT USE other industrial gases.
5.1.1
Compressor strength-pressure test
The compressor has been strength-pressure tested in the Emerson factory. Therefore, it is not
necessary for the system manufacturer/installer to strength-pressure test the compressor again.
Scroll compressors are divided into two pressure zones. The compressor high-side and low-side
maximum allowable pressures PS have to be respected at all times.
5.1.2
System strength-pressure test
A strength-pressure test of individual sections of the entire system is permitted. Once the compressor
is isolated, the rest of the system can be tested with the required pressure values.
The strength-pressure test can also be conducted with the compressor connected, but in that case
the two pressure zones of the scroll compressor need to be respected:
▪ System high-pressure section:
Define the system high-side PS ≤ compressor high-side PS.
o
o
Isolate the high- and low-pressure sections of the system by closing valves, solenoid valves,
expansion valves or by other means.
o
Use the internal check valve of the compressor on the discharge side or add an external
check valve.
To protect the compressor internal check valve, observe a maximum pressure
delta of ≤ 40 bar between the high-pressure side and the low-pressure side.
o
Activate the check valve with a fast pressure increase. Once the check valve is activated,
the pressure increase can be slowed down.
o
At this stage the system test pressure of 1.1 x system high-side PS can be applied for a short
time.
o
During the system test, make sure the pressure inside the compressor does not exceed the
maximum PS value, which corresponds to the compressor low-pressure PS.
▪ System low-pressure section:
Define the system low-side PS ≤ compressor low-side PS.
o
o
The system test pressure of 1.1 x system low-side PS can be applied for a short time.
AGL_Ref_DG_YBDK1E_EN_Rev04
23
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