romanowski72
20-01-2017, 04:12 AM
Hey guy, I had a 5' True sandwich prep table yesterday customer says not cooling, but had been in storage for 2 years, they purchased it used and when they picked it up, it was running and at correct temperature, they took it to storage right after they purchased, when they plugged it in couple days ago no cooling.
I got there and compressor and all fans run fine so I hooked up low side gauge, soon as I took the cap off the access port it was leaking I could hear it, so I tightened up the schrader valve and it stopped, put low side gauge on purged line and plugged unit in pulled to vacuum this unit is r134a, unit did not have a access port for discharge line I put in 8oz r134a thinking it leaked out through schrader while sitting for the two years. tag call for 9 oz.
Pulled straight to vacuum as soon as i turned off the gas, I put a temporary valve on high side off of filter dryer and my discharge pressure is only about 80psi. MY clamp-on temperature sensor went bad so i could not get superheat or subcooling, going back out there on monday to pull out the gas and weigh it, oh and my amperage was 7.1-7.3amps run amps for table rated 7.8amps.
small little section of frost at end of cap and inlet of evap, couple 3-4 inches maybe.
If i overcharged my amps would be high.
If it was undercharged amps would be low.
Plugged cap tube high side pressure would be high.
Bad valves and amp would be low
I did put a cover over condenser to see if pressure would go up and needle did not move.
Any ideas guys I am going back on monday thanks much for your time and input!
I got there and compressor and all fans run fine so I hooked up low side gauge, soon as I took the cap off the access port it was leaking I could hear it, so I tightened up the schrader valve and it stopped, put low side gauge on purged line and plugged unit in pulled to vacuum this unit is r134a, unit did not have a access port for discharge line I put in 8oz r134a thinking it leaked out through schrader while sitting for the two years. tag call for 9 oz.
Pulled straight to vacuum as soon as i turned off the gas, I put a temporary valve on high side off of filter dryer and my discharge pressure is only about 80psi. MY clamp-on temperature sensor went bad so i could not get superheat or subcooling, going back out there on monday to pull out the gas and weigh it, oh and my amperage was 7.1-7.3amps run amps for table rated 7.8amps.
small little section of frost at end of cap and inlet of evap, couple 3-4 inches maybe.
If i overcharged my amps would be high.
If it was undercharged amps would be low.
Plugged cap tube high side pressure would be high.
Bad valves and amp would be low
I did put a cover over condenser to see if pressure would go up and needle did not move.
Any ideas guys I am going back on monday thanks much for your time and input!