Hi can you please suggest how they redone the installation? did they remove all R410a gas , vacuumed and reinserted/refilled the gas? or just pumped down the gas? what is pump down.?
They had not removed the gas out of the air conditioner. They pumped back the refrigerant back into the Outdoor Unit. Then with the vacuum pump, they vacuumed the system. Then they charged the system with refrigerant from outdoor unit and topped up the gas from the refrigerant bottle, which they had brought along.