Look at your system's piping schematic. Notice the hotgas bypass (bypassing the condenser) valve. This will generally be a 3-way cutting out condenser liquid... and allow hot gas straight from the compressor to go straight to the evap... yes the compressor runs during this.
You should call a profressional refer guy to handle this... unless the sequence is an automatic from a panel switch. If you don't know which refrigerant you are using in the system... or which valve is the bypass valve or how it is actuated... you should not initiate this process - you might damage the system.
Hope this helps.
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