In what mode of operation....More specifically, the discharge superheat method; Ambient temp added to discharge temp. This method has served me well but doesn't work AT ALL in 410A systems. Anyone else use this method or know why that it doesn't jive with 410A?
Right...same principle triple.In heat pump mode...If it's a new install it's a no brainer. What I'm talking about is a unit you are not familiar with and need to get running.
Thanks for the reply. My 410 experience is limited. My tried and true methods of verifying charge (on HPs in HP weather) aren't adding up with the 410 splits. Roof tops, obviously, not an issue.Those old methods once used with R22, a azeotrope, will not work the same with R410.
Thanks for the reply. My 410 experience is limited. My tried and true methods of verifying charge (on HPs in HP weather) aren't adding up with the 410 splits. Roof tops, obviously, not an issue.
Admittedly.....410a is classified as a "near" azeotrope refrigerant directly because there is little slide or glide between the blends but the fact remains that it can seperate. In fact there are many cases where it has which it turn will cause irractic pressures and operation of the equipment....this is why all zeotrope refrigerants, including 410, must be charged as a liquid.weight in charge in the heat pump mode per data plates, and then fine tune if needed. If around 60* you can artificially build heat in the condenser to simulate a 95* outside ambient temp and charge in the cooling mode with subcooling(if TXV) or evaporator superheat if fixed type orifice. Personally, I have not seen a problem between R22 or R410A The 410 fractionates so minutely that is is a trick to actually see any variation in the outdoor or indoor coil due to fractionation of the refrigerants.
In heat pump mode...If it's a new install it's a no brainer. What I'm talking about is a unit you are not familiar with and need to get running.
Do you think there are going to be any significant changes in the upcoming build?Admittedly.....410a is classified as a "near" azeotrope refrigerant directly because there is little slide or glide between the blends but the fact remains that it can seperate. In fact there are many cases where it has which it turn will cause irractic pressures and operation of the equipment....this is why all zeotrope refrigerants, including 410, must be charged as a liquid.
410a, despite its good qualities, is a very poor refrigerant when compared to some others. Equipment components are more patio covers expensive due to a need for greater design & build to be able with stand the extreme differences. That being said 410 is here for now so we all have to deal with it.
Do not be surprised however to see 407c in the near future. It has a closer characteristics to R22 and a lower GWP than both R22 or R410.
