Refrigerated air dryer

[Refugio]

I need to know what´s going on into a Hankinson Dryer
its boiling point is 38 °F with R-134a I set the low pressure as what is said in the datasheet (31 psig) but the air temperature is out of range
What could it be?

this systems uses a capillary tube and hot by pass that seems to be ok
i mean.. close
what can you recommend me to do
it looks like having high superheat somewhat
what´s the right proceedment to recharge this kind of system

[Hardwater]

What's the humidity and temperature of the compressed entering the dryer? Is the dryer receiving the air from a compressor. What type of system is the dry for? All it does is lower the temperature of the coil so the water will condense and fall to a reservoir and is then be blown off with what ever type of trap is being use. So the inlet air supply temperature is the critical point.

[Refugio]

What's the humidity and temperature of the compressed entering the dryer? Is the dryer receiving the air from a compressor. What type of system is the dry for? All it does is lower the temperature of the coil so the water will condense and fall to a reservoir and is then be blown off with what ever type of trap is being use. So the inlet air supply temperature is the critical point.

the air stream leaving the dryer is too high i got an alarm coming from that point
the pressure seems to be ok, the air is coming from a compressor, the whole
system feeds actuators, air guns and etc...
but this refrigerated air dryer is one of the non cyclings
that´s why i´m not sure of the way that it is recharged...It has a gauge the tells
us that the pressure is on the green line that´s suppose to be ok
but I doubt it maybe the hot gas bypass is giving that reading before of full recharged, maybe that pressure is given as it would be alright
that´s for I ask What´s the right way to recharge the system...

[acdude123]

the most accurate way to charge is to weigh in charge to factory specs

[Refugio]

the most accurate way to charge is to weigh in charge to factory specs

Thank you
I guess that´s the better way.

[superfittertech]

weigh in the charge or add refrigerant until your superheat comes down. should be about 15-20 degrees at the compressor. system uses cap tubes and an accumulator with a hot gas bypass valve that goes directly from the discharge to the suction. The reason for high superheat is unit is undercharged and probably has a leak. find/fix leak and recharge.

[Hardwater]

the air stream leaving the dryer is too high i got an alarm coming from that point
the pressure seems to be ok, the air is coming from a compressor, the whole
system feeds actuators, air guns and etc...
but this refrigerated air dryer is one of the non cyclings
that´s why i´m not sure of the way that it is recharged...It has a gauge the tells
us that the pressure is on the green line that´s suppose to be ok
but I doubt it maybe the hot gas bypass is giving that reading before of full recharged, maybe that pressure is given as it would be alright
that´s for I ask What´s the right way to recharge the system...

Recover charge from system evacuate it then weigh in charge to manufacturer's specs.:CU:

[Refugio]

weigh in the charge or add refrigerant until your superheat comes down. should be about 15-20 degrees at the compressor. system uses cap tubes and an accumulator with a hot gas bypass valve that goes directly from the discharge to the suction. The reason for high superheat is unit is undercharged and probably has a leak. find/fix leak and recharge.

Thanks
I´ll do it like that

[pallavjain]

Hello everyone. I am new to the forum. Need your help. I am designing 100 cfm air dryer. Pressure dew point is 4 degC. I require following information:

1. Compressor selected is Copeland Brand hermetic model KCJ467HAG
2. what will be capillary size?
3. what will be condenser size?
4. what will be fan size ?

Will truly appreciate your support.....

[klove]

Hello everyone. I am new to the forum. Need your help. I am designing 100 cfm air dryer. Pressure dew point is 4 degC. I require following information:

1. Compressor selected is Copeland Brand hermetic model KCJ467HAG
2. what will be capillary size?
3. what will be condenser size?
4. what will be fan size ?

Will truly appreciate your support.....

This is not a DIY site. Even if it were, you need engineering support, not technical advice. Why don't you just go buy an air dryer? If you know the evap temp and how big the compressor needs to be, why can't you figure out your condenser sizing and go to a cap tube selection chart and pick those out?

[derekkite]

I've run into a couple air driers where the refrigerant leak on the evaporator introduced air into the system. The air pressure is higher than the refrigerant pressure.

That will give you very odd superheat and pressure readings. Reclaim and do a pressure test on the system.

[koolkahuna]

I've run into a couple air driers where the refrigerant leak on the evaporator introduced air into the system. The air pressure is higher than the refrigerant pressure.

That will give you very odd superheat and pressure readings. Reclaim and do a pressure test on the system.

Good info! Same applies to leaking water cooled condensers when the refrigerant escapes to the point at which the refrig pressure is lower than the water pressure. Water enters the system through the leak hole, bad results.