QUOTE(spreeeee @ Mar 28 2018, 04:37 PM)
how it should works for gas refill? isn't it needed to be filled in on each service? chemical wash will dismantle the whole AC unit..
Here is the detail how they service.
Before take down the indoor unit for cleaning,
1) Run the aircon.
2) outdoor unit put a pressure gauge to monitor the gas pressure at the valve side.
3) Slowly turn off the valve till the pressure gauge show 0 when the aircon run. The purpose is to let the compressor pump the gas back to the outdoor unit and till no more gas in the indoor unit and the piping. Turn off the valve not to let the gas out. Hence, keep the gas on the outdoor unit.
4) Than turn off the aircon, unplug the piping and take down for thoroughly clean.
5) Finish cleaning, put back everything.
6) Open back the valve and run the aircon. Monitor the gas pressure is enough or not. If the gas remain between the spec, no top up is require.
So there is no gas lost or whatever during service.
The indoor unit have to be take down for thoroughly cleaning. Without taken down, the evaporator and the fan cage cannot be clean completely.
How you going to flush the dirt with water when the aircon still hang on top in your room ?