Restriction/ major overcharge??? - http://www.hvacmechanic.com/ Forums

Original message

kg321

199.82.243.71

"Restriction/ major overcharge???" , posted Fri 27 Jun 02:13

ok...Another tech went and serviced/cleaned a unit last Thursday. From what he says when he left pressures were correct and unit was running fine. Customer says later that night it was not cooling and there was not any hot air coming out of condenser. Tech went out of town on vacation and called me to check it out. When I arrived Wednesday, pressures were 10 on low side and 150 on high side. Of course suction line dry and warm. I didn't want to just add gas right away so checked capacitor for full charge and checked compressor amps. Both checked out ok. Added gas. Appears unit was completely empty of freon. Added gas and got pressures to 65 and 275 (86 degrees outside). High side climbed a little (possible restriction). However suction did not get cold. Temp out of vents inside house only coming out at 76 degrees. Evap coils nice and cold but not frosting. Filters clean, a-coil clean, returns not blocked. Is this restriction problem?
Did I just majorly overcharge system? and if unit was that empty of freon that quick as of Thursday must be a leak in system. Couldn't find leak with leak detector. Called today and homeowner says feels the same as when I left with some cool air but not cold out of vents. This would tell me there was no leak so I must've majorly overcharged unit. What would cause low side to read only 10?

Replies:

theduke03

24.250.18.179

"Re(1):Restriction/ major overcharge???" , posted Fri 27 Jun 06:42

High superheat + high subcooling = restriction(or txv problem)
High superheat + low subcooling = low charge

"My dad was the most feared furnace fighter in Northern Indiana."