maintenance phases

* examines the unit senses

* cleans evaporator and condenser water and air

* fit condoms

* lubricates the rotating parts

* examines the compressor stalls

* Clean air filter

* examines the conduct of fans

* Cleans supplements

* examines the drain tube

* monitor performance of units

* Amend the evaporator and condenser fins

* Amp measures at various stages after the reform of holidays

* measures the pressure of the units

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