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I've not had any luck locating a schematic for this unit. The schematics on the unit are not legible. I am wanting to replace the thermostat. I wanted to see if it's possible to install a standard...

I understand. So let me close this thread by saying >
#1 I thought I had posted on the pro forum - my mistake and apologies.
#2 I told the inspector that I would call the manufacturer, but as a...

And yes I read the data plate and was prepared to run #2 THHN, fused disconnect, 115 amp .
I was just looking for verification... I'm almost sorry I asked you guys....

I have never run power to a very large condenser - mostly residential stuff. If you'll read my previous post - I tried to clarify myself.
I will say it again. my confusion had nothing to do with...

I think my original question confused you all. I have no problem sizing wire and overcurrent. I should have stated my question differently.
Let me ask again - Why does the nameplate data list 2...

Hey guys, just got back..Relax...chill out...I just wasn't sure of the Electrical load on the unit. I hold a Master Electrical and Master Mechanical Contractors License (ICC certified for both) now...

York mod# HB480C00A4CAA2B ser# (S)N0H5622021
The name plate data states :
QTY
2 comp 19.2 RLA LRA 125
2 cfm 2.9 RLA LRA 11.0

this is a...

excellent info. the cold weather is just beginning this year, and I want to be thorough and give my customers there moneys worth. So exactly what is involved in a combustion analysis? Just a visual...

Sent my techs on a PM call for a furnace (no problems - she just wants it serviced). Sent my guys out. Homeowner called back and said they didn't do anything. I told her I was coming out personally...

I'm looking at a fieldpiece sdmn5 manometer. Is there any need to spend more? Does this lack any features that might be useful to me?

No kink in the lines (package unit). Piston. It was a warm day. Just checking the heat prior to the cold weather. Blower is good. I had cover off watching it the whole time. I've changed the...

Unit runs fine in cooling mode, but shuts down on high pressure in heat pump mode.
The unit has been running fine all summer. Pressures are normal in cooling mode.
No one has messed with the charge...

just called her back and told her not to touch it before I got there - but it is blowing cold again already - this is what I'm dealing with. might not do it again for a week. I don't think she's...

Sat 9a.m. Just got the call. headed back out shortly. heating up inside. condenser fan is running. ?? I'll let you all know what I found. but I can tell you when I get there all will be normal - as...

Not a heat pump. I don't know who put these systems in. From the ones I've serviced this past summer, this is the only 410A condenser. All the other mobile homes have very old units, but they are...

This is a new customer. He has several mobile homes on his land - down a dead end road. He's a new customer - owns a large daycare in town.
I've worked on three or four of these mobile home units...

Had a long day, just got in. I have a different compressor coming. Embraco FF12HBX. R12/134a. It has a valve with 3/8 suction. It will bolt right up.
The box has been down a few weeks. I figure a...

not yet. I haven't done anything yet.

I didn't write down any figures. Weighed in the charge. Pressures 115 and 310. 10* SH. SC ?
I feel dumb because I haven't look close at the AH. Good air flow. Didn't see a need to look at it up to...

model SC-CDS32E-6 serial 92-46114-12 R12 refrigerant. McCray Refrigeration Co.
this has a copleland JRE1-0033-IAA compressor that's bad. It has a 3/8 suction and 1/4 discharge line.
My...

Was called out on a 4 ton split system - compressor shutting down about the same time every day. Tennant cuts it off for a while and it works fine till the next afternoon. Next day, I was there...

I have a customer who sent me a text tonight - he said that he replaced his three ton condenser with a 4 ton (I assume he still has a 3 ton air handler) - he was told he would have colder air. He...

Ok. Are you saying that the reason some compressors have horsepower ratings rather than BTU (tonnage) ratings is because one compressor, say CRN-5 can have different BTU ratings - depending on the...

I don't understand why some compressors are rated in tons/BTU's and others (freezers, coolers, etc) are rated in horsepower.
Is there a difference in the compressors themselves?

I'm relocating some supply ducts - they are between studs - in the wall cavity. Since they will be encased between studs and sheetrock, will they need insulation. The ones I'm replacing did not have...

Can anyone help me determine the size of this unit.
I think it's a 2 ton. The house is 1000 sq.ft.
Heil Quaker condenser model CU325AOD1C.
Compressor nameplate - model SRC4-0020-??

thanks, this has been very educational.

I understand. So then, in an typical residential split system for example, would I be correct in thinking that since the indoor ambient is typically 68 -74 degress, for example, there is not as much...

I see. When you say "flood back from the evaporator", are you saying that without a LL solenoid, in the off cycle, as a system equalizes, liquid from the condenser migrates to the evap? And then...

Why does freezers use a LL solenoid / pump down to kill the compressor
via a low pressure switch rather than simply put the t-stat in series with the coil ?
I know there is a logical reason.

What specifically is different in a freezer and cooler controls?
Is it mostly in the charge / pressures?
Defrost circuit?
TXV?

People are fanning themselves, because they are hot in the summer months.

Since there are many live performances, there is a heavy lighting load on the stage - Many lights. Some vendors
bring...

I will have to measure return grates, they are appx. 2 1/2 to 3 ft. wide X 3 1/2 to 4 ft. tall. (not sure ???)
Could be 2' X 3' ??? I will let you know.
I don't think there is any make up air....

This theater has shows via a pull down screen. However it has a large stage - mostly live performances. No supply air on the stage. Maybe he (the owner) made a mistake by blocking off the high...

I have a customer who owns a very old theater with 2 - 30 ton rooftops. Old units. Historic building.
Massive return air plenums - Air Handlers in the attic - one on each side of the stage....

I know this thread is long overdue. I have not been back on this site for a few months. I was to the point of evacuating, changing the txv, and weighing in a new charge -
as a last ditch effort....

I have not solved the problem yet. I have been overloaded with work. Temp is holding at 20. I went back Friday morning and adjusted the charge. The suction was 46. I managed to get it down to 36 and...

I found a schematic. Very old I managed to piece it together and make a copy. It's pretty legible, but it does not show
the LL solenoid or indoor stat. I've seen some that have the indoor stat...

I am still learning about the controls on walk in freezers and coolers. I'm servicing one that is very old.
the evap sometimes freezes. I have been in my school books trying to understand the...

Lowes doesn't sell without install. Population about 50K +. I'm researching this. Never heard of ducane or lennex. I will check it out. That's Lennex, not Lennox?

We have a local Service Company/Dealer. They sell & install Trane units. Of course they service all brands since they are a "Service Company". They do not sell to anyone but their customers/clients....

correction, I meant "open the valves" not the gages

If it's very slow and hard to find, I pressurize both coils and then close both valves. When I come back I can tell if the evap has a leak. then I open valves and pressure will either drop or rise,...

tank has a valve on the bottom and when I depressed it - nothing - no water, no air.

I see. simple enough. I am headed out to check it out. ill repost later

exactly what is the purpose of the expansion tank

ok i see. its metal - about 2 gallon tank. seems odd - one unit had so much damage and the one next to it wasn't damaged. could it be that one was running and the other was not?

yes it has prv - 150 deg F. I had the homeowner turn main water valve off before I got there. he said boiler was making funny noise and had some dishcharge from prv only after he turned off water...

Yes it does have an expansion tank between the boilers. And I will check to see if the air was running. but this happened late in the afternoon. outside temps were in the 50's.
And I pulled the...

This house has 5 split systems - identical. they all are water heated - straight cooling - no electric heat strips. They utilize 2 boilers - Lennox Complete Heat boilers - mod. # HM30-150-5. The...