Re: Air handler freezing up
What's the pressure on the low side (suction)
A single compressor to 2 air handles will not always provide equal pressure and air handles may not be providing the same pressure drop.
Re: Air handler freezing up
lmost likely low Freon. or restricted air flow across evaporator core .....Pat
Re: Air handler freezing up
Quote:
Originally Posted by
doc g
lmost likely low Freon. or restricted air flow across evaporator core .....Pat
With two in the loop one will almost always display symptoms first. If it were mine I'd check the pressures.
Re: Air handler freezing up
Thanks, I’ll see if I can find an a/c guy here in Georgetown Great Exuma to check it out. The filter screen was clean so I suspect low Freon pressure. I’m kicking myself for leaving my gauge set in the storeroom in JAX. If I had brought it along it would have magically ensured that I would have no a/c problems on the trip! Luckily the temps are cool enough to not need it.
Re: Air handler freezing up
It s definitely either low gas or low air flow.
Try running it at a higher Tstat setting so it cycles on and off, increase the blower setting or maybe run the other unit at a colder setting.
Re: Air handler freezing up
They are dometic/cruisaire units with the digital panel. I can’t run them separately, but I can change the blowers from intermittent to continuous to defrost any freeze up and also not run it so cold. If I can’t find an a/c guy, I’ll tempted to get a can of Freon for car systems and pump a bit in, this would be until I can get it serviced properly. I’ll call my service shop in JAX and find out what gas is in the system first though.
Re: Air handler freezing up
Quote:
Originally Posted by
Westfield 11
They are dometic/cruisaire units with the digital panel. I can’t run them separately, but I can change the blowers from intermittent to continuous to defrost any freeze up and also not run it so cold. If I can’t find an a/c guy, I’ll tempted to get a can of Freon for car systems and pump a bit in, this would be until I can get it serviced properly. I’ll call my service shop in JAX and find out what gas is in the system first though.
You can use the "Delta T" method. It's crude but not completely wrong. Measure the return air, measure the conditioned air. Slowly, little amounts at a time, add refrigerant until you have about a 15º difference. Ideally it should be closer 20º but staying well south of that will keep you from over filling and should get you close enough to stop the freezing. I kept a decades old slightly leaky R22 house system going like this for years.
(Standing by for the beating from the HVAC pros :D)
Re: Air handler freezing up
You may find that the Run Capacitor has gone bad causing one of the fans to slow down. (Replaced the run capacitor on same condensor as yours and fans sped up 50% and stateroom cooled quicker.) My 1984 systems use R22. It may say what gas on the condensor label.
Re: Air handler freezing up
I agree with delta T, I use it all the time and I have a complete set of AC equipment in my shop. I check the difference between the air temp into the evap coil and the air out at the closest vent and don't hook up gauges until it drops below 15-18F. The highest evap fan speed may help. Be careful with cans of auto refrigerant as most of them contain stop leak.
George