corepot

BTW, it's gas heat (hot water from gas water heater flows through Apollo heating coil.)

Thanks for your reply, Marc. The coolant coil has never been used, (either for R22 OR 410A), because the previous (and original) owner never installed air conditioning. The Apollo Hydro Heat system in question, however, dates to 1990, so it is unlikely that it will be labeled as compatible with 410A, which didn't come along until later(?). A neighbor with the same Apollo system installed a Puron-based high efficiency Carrier AC unit about 10 years ago and it's working fine. If the coolant coil is clean (virgin) what are the other obstacles to installing a high-efficiency (R410A) unit? Thanks again!!!

Hello! Does anyone have experience connecting high-efficiency (R410A) air conditioning units to Apollo Hydro Heat split system units? I'm getting bids from A/C contractors to install a new A/C unit and connect it to the coolant coil in a (circa 1990) Apollo Hydro Heat split system in a house that has never been air conditioned before. For some reason, the HVAC contractors take one look and say that my hydronic Apollo system is incompatible with newer (R410A) units and that if I want one, I will have to buy a new furnace. They also say that Apollo Hydro Heat IS compatible with old (R22) A/C units. Have they got it right? Or it just a matter of finding the right refrigerant metering device? Anyone know what type of refrigerant metering device is used in the Apollo Hydro Heat system? Is it a hydrostatic expansion valve? Is it compatible with R410A refrigerant and high efficiency (and quiet) condensers? Thanks!

Hello! Does anyone have experience connecting high-efficiency (R410A) air conditioning units to Apollo Hydro Heat split system units? I'm getting bids from A/C contractors to install a new A/C unit and connect it to the coolant coil in a (circa 1990) Apollo Hydro Heat split system in a house that has never been air conditioned before. For some reason, the HVAC contractors take one look and say that my hydronic Apollo system is incompatible with newer (R410A) units and that if I want one, I will have to buy a new furnace. They also say that Apollo Hydro Heat IS compatible with old (R22) A/C units. Have they got it right? Or it just a matter of finding the right refrigerant metering device? Anyone know what type of refrigerant metering device is used in the Apollo Hydro Heat system? Is it a hydrostatic expansion valve? Is it compatible with R410A refrigerant and high efficiency (and quiet) condensers? Thanks!