MikeGardner
29-07-2010, 05:02 PM
Some guys I'm working with have been having a lot of trouble with a 4 drawer reach in cooler. It is a single unit, but has two evaps and txvs. I believe it had been freezing up on both evaps and had low low side pressure and high high side pressure.
They replaced both txvs but still had the same problem. All it did was make the high side pressure higher and the low side lower. They tried adjusting them, but it didn't change the superheat or anything. They then suspected that when they put in the txvs, they overheated the powerheads (there wasn't enough room to remove them.) The unit was still icing up just back to the txvs.
They replaced the powerheads on both, but that didn't help anything either. They are completely stumped now.
Also, even though the high side pressure is about 300psi, the sightglass just shows a small amount going through, like a river. I'm not as experienced as they are, but it sounds to me like a kink in the line before or after the condenser, or some kind of plug there.
Any ideas would be appreciated, thanks.
They replaced both txvs but still had the same problem. All it did was make the high side pressure higher and the low side lower. They tried adjusting them, but it didn't change the superheat or anything. They then suspected that when they put in the txvs, they overheated the powerheads (there wasn't enough room to remove them.) The unit was still icing up just back to the txvs.
They replaced the powerheads on both, but that didn't help anything either. They are completely stumped now.
Also, even though the high side pressure is about 300psi, the sightglass just shows a small amount going through, like a river. I'm not as experienced as they are, but it sounds to me like a kink in the line before or after the condenser, or some kind of plug there.
Any ideas would be appreciated, thanks.