write the procedure to start the chiller system considering all precautions?

Answer 1

Turn the switch on, the light will come on and you will see your textbook.

What sort of chiller system are you talking about my friend?

Answer 2

I have watched them being started at a central HVAC plant for an airport. IT requires a team both at a central monitoring location and at each relevant pump, panel, and compressor. It always starts with a walk around of the equipment by that team with a senior licensed operator confirming everything is ready.

Typically a computer initiates turn ons in response to an operator's startup command. For instance starting cooling pumps, monitoring if they are running, verifying that their flow is adequate and checking whether the valves on the selected path are in their proper position. That then signals an operator in control room that the next step in the process can be authorized. They proceed through these steps that can take an hour or two till the chiller is operational and the proper chilled-water temperature and flow are achieved and the building temperature is as required.

At any step there can be failures or equipment that needs to be bypassed or alternatives (other pumps, other valves, or other chillers) that might need to be substituted or put into a manual mode.

I don't think I can summarize it all in one teeny answer. Typically the operators have been trained and are following a site manual. Also typically they do not start chillers except on the first shift when the most skilled operators are present or when those operators have been called in during other shifts if the start is an emergency.