What are these letters mean

I have this reprt, engineering report.
it has this symbols,
CH, CHWP, CT, FCU, AHU

Those are HVAC – Heating Ventilating and Air-Conditioning terms.
CH – Chiller
CHWP – Chilled Water Pumps
CT – Cooling Tower
FCU – Fan Coil Unit
AHU – Air Handling Unit

It looks like from your other question it is in the context of building management systems (building automation). As you have the full context of the sentences and the report, look them up yourself. Search for the abbreviation and 'acronyms' e.g. 'CHWP acronyms'. Ask the report writer. Maybe there is a list in the document.

Here are some possibles (vague guesses)..
CH, Central heating
CHWP, Chilled Water Pump
CT, Computer Technology, Communications Technology, Computer terminal and a host of others.
FCU, Fan Coil Unit
AHU, Air Handling Unit