Originally Posted by bigMikeB
Trust me piping insulation has no impact on the freon charge. If you have to start stop the unit to get it to work, you have other issues than armaflex. Who charged the unit? Was it charged in the a/c mode? In the heat mode you have hot gas going to the indoor coil to be condensed to liquid. Who wired the control wiring of the unit?
the unit has been charged by a hvac tech who normaly don't really do carrier unit but he followed the temperature vs pressure chart
the wiring has been done by myself according to the wiring diagram inclued with the unit (electrical part, and thermostat wiring)
the unit was working fine for the last month. the suddenly ping sound(popcorn in a can) came the day after the insulation...
considering the sound come only ~45min after starting the unit in a cold start, this is why I tought it might be explained by the added insulation because now, gas come hotter in indoor unit now because at the back of the indoor unit was the garage's attic, also, a cold place