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To test the TXV actally place the sensing buld in a cup with ice then warn it up just to determinate if the valve is responding, if the valve is stuck wide open like you are suspecting, why the...

OT 50F , suction is a way high, remove the sensing buld and warm it up, with ur hand that should start to close the TXV, IF it does not, valve need to be repraced or the head.

Also due the the...

Delta T across the coil is kind of high, it could be due to low air flow, and someone charged the system by pressure only, pressure low oh yes more refrigerant and more and mo:gah:re till it gets...

Is it a chilled water AHU?

Few week ago I went to a service called, I found one of the fuse blown, the costumer told me that it wasn't the first time this happened,

The issue had been ...

have the tranformer been replaced? maybe the VA ARE TOO SMALL , LOOSE OR RUSTY CONECTION SOMEWHERE

yeah thats true.Good point

with a axu 2 pole relay,kill the common of the fan and in the other contactor the yellow wire for cooling

INTECBILL; IF the condenser is restricted the high pressure 'll increaes as well the compressor amps drawing , due to that , the widing temp 'll raise and the compressor overheats , but that...

normally the dip switches have one for cool and other one for heat mode

make sure he , set the dip swicthes rigth , to mach out door unit.the grill siza is can of small too.

just check on post #2 its already explained over there, why this happens / and the unit was a 2 ton corfort tech , the piston i think it was 23 i dont remenber but it definely was a lot smaller...

belive it or not the orifice works like this larger piston = lower suction and higher head pressure, and smaller piston higher suction pressure and lower head pressures (in the same size evap), the...

ok now it has sence , thanks a lot for ur help, one more last thing with a larger piston the suction pressure gets lower so I think if I AM not wrong , what happens in this case the refrigerant ...

oh and other thing ,was than the liquid line with a lower high head pressure felt warmer? I dont get it

thanks, that is what I was thinking about the low side but i could not understand what was happening with the high side, now has sence thanks for ur help. what i dont get is why like u said smaller...

hey guys , I got a called the other day , costumer reported outdoor unit making a huming noise , I arrived to the place ,there was a little huming noise in the compressor , not too loud and I ...

my bad !! lol

a high leg won't affect the compressor in three phase system , check the rotation,must of 5 ton system have a single face motors. how was the pressures? was the compressor noise after stared it up?

he changed the coil and few days later he found a obstruction in the dryer, if he service it right the first day that would not ever happend . that seens to me just a bad installation and the tech...

i have done it , more like small refrigeartion aplications , when i dont have a label plate with amount of freon , but also checkin TD and pressures at the same time , this its just to make sure...

the manual will tell the min cfm for ur ahu, but u deffinily have to check the system 's pressures. the compressor could be flooding with liquid freon and not necesary icing up at the evap.

some times what happends the drain is not glogged its just than the drain line gets air lock specially the ones that coming under the house, cause makes like a kind of p -trap , put some water in...

does the fan seen that is working full speed? .... are the fan motor and fan blades originals or they have been replaced? I had a problem like that and the fan blade some other tech had replaced it...

yeah it can fail totally closed , if the gas in the sensing bulb leaks out , we need more info to help u out, is this system a dual system or single system?

THE FIRST TECH ADDED FREON AND THEN HE SAID THE PRESSURES IS TO HIGH , HUH ? YEAH IT SOUNDS LIKE A TXV PROBLEM , I WISH WE CAN KNOW THE PRESSURES READING.