AGL_Unit_ZX_Small_E_Rev03
17
4.5 Checks before starting & during operation
IMPORTANT
Liquid valves not fully opened! Liquid trap!
The valves on the liquid line
should be fully open, in order to prevent liquid trapping.
Before a system runs for the first time:
▪
Check that the valves on the liquid line are fully open.
▪
Carry out visual inspection.
▪
Perform control tests to ensure all controls operate correctly, including any manual backup
system (if applied).
▪
Check also the following:
✓
Documentation for the system and its marking, especially pressure equipment.
✓
Installation of safety devices.
✓
Compressor oil level.
✓
Pressure test records.
✓
All valves open/closed as required for operation.
After start-up and when operation conditions have stabilised:
▪
It is recommended to check the oil level in the compressors and to add oil if necessary, to
ensure a sufficient oil level (halfway up the sight glass).
▪
The following should also be checked:
✓
Fan rotation.
✓
Refrigerant charge.
✓
Suction superheat.
4.6 Restart after unexpected stop
In case of unexpected power interruption, the unit will restart automatically as soon as power is
supplied again, and suction pressure is above cut-in value.
