Search:

The condenser is dumping cold liquid into the receiver, while the ORD dumps in hot gas to push out liquid and flood the condenser. The ORD needs to constantly feed because the cold liquid is...

No these systems are fully charged, clear sightglass at all times. Thats what raised my original question. I eliminated all the obvious problems that would cause it to feed and all I can come up with...

Yes in theory that is exactly how it works, but I dont know if there is actually much modulation in the ord at very cold ambients I think it is pretty much open all the time. Im in Ontario and have...

My question is regarding the sporlan ori/ord valves in the winter. On the very cold days (-20 degrees C) Is it normal for the ord to be bypassing all the time or just periodically. I thought that it...

thanks. How can I contact the administrator? I dont see anything on this site.

I dont think that "COOLER THAN NORMAL" Really means cold. For example a 404 system running without noncondensables say at 100 degrees sct (235psi) and an ambient of 80 degrees the liquid line may be...

Is there any way to change your username on this site or delete treads that you posted?
Thanks

Thanks Jp. I guess what my original question all comes down to is
Do you get a more constant control of superheat using a balanced port txv with systems using fan cycling? Everything I read says...

Thanks for the info on this topic guys. Ive just always been told that a balanced port txv should be used anytime you have fan cycling. I assumed that this was the reason.

404 in winter running at 190 psi up to say 250/ 260 psi in the summer is very possible

Balanced-Ported valves

With a conventional TXV, the pressure differential across the valve results in a force that tends to “open” the valve. As operating conditions vary, this pressure...

I dont believe the change will be drastic but there will be a change. In the spring and fall when utilizing fan cycling I think these valves would start to hunt due to the fluctuation in head. Hence...

If I have a conventional txv in a system with fan cycling and head pressure control and I set the superheat at say 10 degrees when ambient is low (Winter) would I see a drop in superheat when the...

The trenton thermsaver is a two pipe hot gas system. The diagram you have is correct. These Trentons have been converted to a three pipe system though so there will be no heat exchange because the...

There is little superheat if any at all. I dont understand how you can even get much superheat in defrost anyways. Your dumping hot gas into the evap which will condense and come back. this is the...

Just the cpr, Return gas is at saturation, normal for hot gas defrost

I have 4 Trenton hot gas defrost condensing units on a roof. On occasion I have herd and even felt the cpr valve rumble like crazy about mid way through a defrost. Now this doesnt happen every...

evacuated an ori/ord system today and it doesnt pull through. So ya suction discharge and liquid line it is. Thanks all

An ori and ord combo works the same as a headmaster so I would think you would just pull through the ord. Therefor still pulling the condenser.

Actually tested this out today with a headmaster control and it does pull through the bypass portion of the valve which evacuates discharge line and condenser.

If you pull from the king valve and suction service valve on a system that has a ori/ord or headmaster, are you still pulling from the condenser and discharge line? I thought it did. am I wrong?
...

Yes I agree. I forgot to mention that these systems do have hot gas defrost.

The pressure drop occurs before it even enters the evap. There souldnt be hardly any drop at all. The line is undersized. And I did contact Keeprite.

I added some access fittings and found there is about 65 psi pressure drop in the hot gas line. There is no way we are feeding enough gas to the evap. Im just waiting for the go ahed and I will...

Just wondering how you guys are setting up your fan cycling controls in addition to head pressure controls (ORI and ORD) This time of year I seem to find alot of systems that are set up so they...