AGL_Ref_ST_YFK1E_EN_Rev01
21
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-f lammable bef ore 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 ref rigerant charge exceeds 1.54 kg for
compressors YF05K1E to YF09K1E, and 1.93 kg f or compressors YF10K1E
to YF15K1E. Turn the crankcase heater on 12 hours bef ore starting the
compressor.
5.1 Strength-pressure test
WARNING
High pressure! Personal injuries!
Consider personal safety requirements
and ref er 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 f actory. Theref ore, 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 values 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:
o
Def ine the system high-
side PS ≤ compressor high-side PS.
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. T
o 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 f ast pressure increase. Once the check valve is activated,
the rate of 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:
o
Def ine the system low-
side PS ≤ compressor low-side PS.
o
The system test pressure of 1.1 x system low-side PS can be applied for a short time.
