Maybe try manually entering suction line size until it gets you in the right velocity window? Maybe a problem with auto select.
Type: Posts; User: Out in the cold
Maybe try manually entering suction line size until it gets you in the right velocity window? Maybe a problem with auto select.
What's wrong with that? 21,000+ fpm with 0 pressure drop, perfect!🤣. That velocity will return oil before it ever left the crankcase.
Tecumseh must have another issue with software. Ive had...
👍 Tecumseh's box load online calculator is a good resource too. (When their websites not down...)
https://boxload.tecumseh.com/RefLineSizing.aspx
Wrong chart. He said 448a.
ASHRAE is the authority to go to for refrigerated product storage requirements. Get a copy of the refrigeration handbook. The ideal temperature and humidity for every product is a little different....
Have had alot of trouble with that in Heatcraft Inteligen units. Econet hasn't been as bad of a problem for us. EEV wouldn't respond quickly enough and low pressure control would cut out. Time delay...
So what would happen if you just started it cold and walked away?
[QUOTE=Andy Schoen;26502707]I remember an OEM that inadvertently installed condenser coils backwards, bottom feeding them. The systems didn't perform very well. ;)
Funny you mentioned that. I had...
No, PECMSG is right. Sure, suction pressure may drop in some instances but you can close the TXV a modest amount on many systems and pressure CAN remain the same. You can bet on the suction line temp...
I've always been taught the condenser should be free draining for the same reason the discharge enters the top and the liquid leaves the bottom of the coil.
I'm not certain but I would bet this...
Did you mean SC liquid 'leaving' the receiver and 'entering' the liquid line? I don't think there has been any argument that SC liquid enters the receiver (at least sometimes). It has been very...
Gentian is correct. Beacon must see the resistance or current draw from a coil or it will just stay in pumpdown. In a pinch you can hook up a dummy relay coil to the compressor terminal to it so that...
Just about everything you'd need for basics. Temp, defrost & termination control. Fan control. Dry alarm contacts. Doesn't have all those other parameters nobody ever uses. Only about 2 dozen...
The dixell (emerson) is much better imo. Far less failures and much simpler programming. Paragon also makes a pretty good ERC-2 with integrated or remote display options.
Not to mention everything is GRAY now. Gives 50 shades of gray a new meaning doesn't it?
Possibly. I don't know where experimental ends and accepted refrigerant begins. I know there were/are a lot of blends that were developed and researched that never made the cut or got an ASHRAE...
Why not just use an off cycle defrost? If its making temps just make sure there is enough differential before it cycles back on again.
Ive read through section 608 pretty thoroughly before and have never found anything specifically outlawing mixing. I taught certification classes for three different providers for 16 years and never...
Id be interested to see that language if you could find it again.
11 defrosts a day?!!?!? Did you leave any time for refrigeration?
As far as I know it is not against the law. I have never found any legal recourse for mixing refrigerants, but in my opinion it is extremely sloppy and unprofessional. Refrigerants should never be...
Beg your pardon but what exactly is a "copeland rack"?
Years ago before I knew any better, I put a LP control on an indoor upright cooler with a cap tube to replace a cold control. It actually worked fine but I got lucky. For an ice freezer where it...
Aka R-718
Sample 1 = mixed, sample 2 = mixed, sample 3 = unknown, sample 4....:gah:
They are ALL grey now!!! Unless you're getting old stock. Whoever decided to get rid of color codes has never had to grab a tank of gas out of a van in the dark.
As of right now all HFC's (404, 507, 407c, and eventually 410a and 134a are being phased out. SUPPOSEDLY HFO's including 448 and 449 are going to stay. Don't hold your breath though...
Who says you can't cut open a tin can? Usually alot of clues exist without doing that though.
Maybe I missed something, but who mentioned using R-22?
So I just double checked with 3 brands of outdoor units we use regularly in the 1/2-6 hp range. Copeland, russell and heatcraft. They don't offer any with 3/4 suction stubs that I found. But...
This all looks pretty normal except maybe the cut in pressure, but what we haven't heard is what happened to the last compressor (or any previous ones if you have that info). You can almost always...
Just an unusual size to find. I rarely see refrigeration equipment stubbed out for it. No reason why I can think of. I can't remember ever finding it referenced in sizing tables I use either. I'm...
You'll need either vibration eliminators on suction and discharge lines or make some vibration absorbing loops above it out of soft copper for line movement. An EAVB is air cooled, make sure its...
3/4"??? You must mean 7/8". Refrigeration guys don't use that silly 3/4 stuff except for drains maybe.;)
X 2. Last week I had a Trane factory guy trying to tell me I had low superheat on an ice rink because it was overcharged (EXV's with pumpdown). I'd also add to that flooding can come from other...
Painful the first time you set it, absolutely. But if your in a controlled mechanical room its tough to beat.
The rule of thumb for needing an auto pumpdown is anytime the ambient temp at the...
Are you talking about factory warranties or something set up through the corportate restaurant? Ive had little trouble with warranties paying off. Sure theres some that wont cover but the bigger...
I realize I'm late to the party, but here's my 2 cents anyway...
1) Most of our units will recycle on pumpdown 1-4 times. More when it's cold out for a variety of reasons. Had systems doing this...
Couple more hours north. Straits area and UP
Restaurant refrigerarion is probably 40% of our work with generalized foodservice refrigeration adding another 10 or 20% to that. We are busier now than we've been in 20 years. We are in a heavy...
A factory Vogt is complicated enough. We've got one made in the 80's that was "remanufactured" by someone other than Vogt. What a mess. Took a lot of calls to some old timers at Vogt to get it...
Don't spend your money on a new start pack unless you know something in it failed. And if you do find the compressor is mechanically locked, don't mess around with a CPR, just replace it with one of...
That's the part I have a hard time with, especially when they are trying.
It seems like AC guys have the toughest time, I suppose because most of them around here are plumbers and heating guys and they don't charge systems on a regular basis and even then, only in summer....
Until new techs get a handle on it I like to put a piece of tape over the sg and have them charge a few systems. Trains them to rely on their instruments and not just their eyes. It takes them awhile...
Ha ha!! I can already feel the love!
It's sorta been on the radar. I guess I figured I was having all the fun I could stand doing service work and dealing with angry people! :D
I might take you up on the invite, thanks.
I didn't know they made a mechanical version, I've been using an interval delay solid state version. Good to know :)
Yes, good diagram. This is a split condenser though. Different beast. Checks are needed to prevent draining from an active condenser into an inactive one. All our markets with split condensers...
With respect to check valves on traditional remote cond. units, here's how I see it. I know most manufacturers recommend heated receivers at -20F ambient as Terry showed us. We specify...