Operation during power off
3.2.5.1 Cut off power supply according to electric operation procedure.
3.2.5.2 Rectification column
a. Immediately close expander inlet & outlet valve, upper & lower valve of LOX, LIA level meter.
b. Close oxygen sending valve and open oxygen vent valve.
3.2.5.3 Purifier
a. Close air to rectification column valve.
b. Cut off power supply of electric heater.
3.2.5.4 Operation of air compressor is the same as normal stop **except not pushing the button.

"но кнопка не нажимается или нажимается?"

Спасибо!