Hi guys,

I've got a reverse cycle a/c running with R410a. Cooling is ok, no problems.
In heating mode, however, I have a small Evap (means Cond in heating mode) plus having to maintain low rate flow rate for noise level benefit. This made not decent heat exchange rate for the high side during heating cycle. Consequence, system show signs of overcharged in heating + high head pressure no matter how I control the captube length or TXV. High Hp is not accepted as it will exceed the working envelop in warm climate.

Do you think of any way to work around this? Could an accumulator or a receiver help?

Constraints:
  • Maintain same charge for Cooling performance.
  • Maintain low air flow rate for noise.
  • Can not have a bigger Evap.
  • Captube or TXV variation does not help.
These limitations made it too hard for me to control head pressure.

Thanks for any suggestion.