Post a reply to the thread: 10 ton Carrier Cond on a 7.5 AHU
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Sounds Like AN Older Ross-Hill Design House, An APR CONTROL Valve Is The Way To go ,Overdosing The Condenser Will Not Cause Head Problems However A RecieverWorks Wonders Also With A Medium Static Drive Package You would Be Ahead Of The game
Originally Posted by Crazecodyk They were set up similar to that around here. The drilling companies wore us out for a design flaw! Let me guess half the scr house is fine where the other side with the big transformers is scorching? I know the brand of the equipment i was working on. It's not the one you mentioned. Tried calling manufacturer several times and got nowhere with them. Best set up that worked well were two 10 ton splits with ductwork running the length of the building. I was misleading in my initial post. They're Trane not Carrier. What they've gone too lately is even worse. 10 ton side discharge units that are built in some warehouse located somewhere around the ship channel. They're not UIL certified. Just a mix of parts you can buy through Johnsons supply. They will size a 120k btu unit for exactly a 120k btu load......*sigh* When I brought this HUGE mistake up they looked at me like I was crazy. " Of course it will handle the load " No, because it will NOT always have 120k capacity depending on everything from OAT to humidity levels.
Yeah WITH A 100% backup
They were set up similar to that around here. The drilling companies wore us out for a design flaw! Let me guess half the scr house is fine where the other side with the big transformers is scorching? I know the brand of the equipment i was working on. It's not the one you mentioned. Tried calling manufacturer several times and got nowhere with them. Best set up that worked well were two 10 ton splits with ductwork running the length of the building.
It's a nov rig? I thought they were just a service company.
Originally Posted by AddMore22 Huh.... Is it a scroll? And no kind of staging or unloading junk? What drilling company? Yes it's a scroll and no unloaders or staging. NOV.
Attachment 272811Attachment 272821 SCR house ... Just so people would know what we're talking about
Fan coil.
What makes the AHU a 90K btu unit? Is the AHU a furnace or just a fan with coils? You should see what the fan CFM rating is... I can think of a few reasons... 1. They need 120K of cooling but only need around 3000 CFM, possibly lowering the CFM to get more latent cooling. 2. They have minimal duct work and thus have low static pressure loss so they can get a smaller AHU with a smaller fan but that smaller fan can still meet the 4000 CFM. 3. They made a mistake.
Huh.... Is it a scroll? And no kind of staging or unloading junk? What drilling company?
Can you do a fellow SCR AC tech a solid and ask around. Maybe you could gwt a better answer than I did. 410A pressures were 410 discharge with 90 suction. 90. Thats well below freezing and ambient was over a 100 and return at 78. Crazy.
I work for Nance. And I'm not sure for the reasoning behind that other then some engineer pencil whipping something.
Compessor being oversized runs higher head under normal loads. High ambient and high load doesn't improve that. Its just a bad idea.
Hmmm..do you work for custom ?
Most of the time
You work offshore right ?
Lol... The company I work for builds custom units for that exact reason .... I do not work in shop, so I don't know all the details.
Originally Posted by AddMore22 What rig is it? On SCR houses the cond. units are right near the large transformers and 9 times out of 10 it's Insanely hot back there. Perhaps they over sized to adjust to the outside heat.... Does it have a receiver ? Is is a specific systems ? Or a Custom Cooling Controls? Not a Custom Cooling Controls unit. Not a pressurized room either. Sure they're located next a big Xformer and a huge set of brake resistors...I think that's what they are. They absorb reverse EMF when the motors spool down and stops. Discharges the excess heat through louvers. Oh and No receiver. Just your basic commercial grade 3 phase mismatched unit. High load inside and high load outside is the typical application. I guess the reason could be High Ambient but like I said there are better ways to address high ambient issues. How about installing a condensing unit rated for more than 90 degrees Fahrenheit ? They're actually moving away from the splits and going with "homemade" wall mount and package units. Made in Houston and not even UIL approved. I think the homemade ones are made by a company called "Mustang" I could be wrong. Got a good look at one of them the other day. Just a hodge podge of motors, coils, contactors and a Copeleand compressor. Whatever Johnson Supply carries. I mean that. It looks like they went on a shopping spree through Johnson supply and then went back to the shop and built a A/C unit. Complete junk IMO. Its the inevitable consequence of letting the bean counters call the shots.
Attachment 272771
What rig is it? On SCR houses the cond. units are right near the large transformers and 9 times out of 10 it's Insanely hot back there. Perhaps they over sized to adjust to the outside heat.... Does it have a receiver ? Is is a specific systems ? Or a Custom Cooling Controls?
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