Results 51 to 64 of 64
Thread: Superheat
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06-06-2001, 11:09 PM #51
Bernie, your are right about one side openning more than the other. As I've mentioned earlier, unit is working good now. I don't planned to do any adjustments.
The other contractor installed a defrost timmer- the ones use in household refrigerators- it appeared to solve their problem also.
The intend of my original post was to find out how expert adjust super heat with multi-evaporator set up. not how to jury rig the system. Most of the time I know how to jury rig and get around the problem. However, as a professional in this field, I preferr not to jury rig. Frankly, it bothers me whenever I see other people jury rigged around a problem - instead of fixing the problem like it is supposed to be fixed.
Be Happy
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07-06-2001, 02:52 AM #52
ok dan, i also agree that we are all professionals striving to do the right and proper repairs for all our accounts. I think the important thing to remember is this. Sporlan takes great time to factory adjust all tev that leave the factory. There is one that will fit every application i can think of. now lets consider this, every piece of equipment we work on has a specific reqirements and controls in order to function properly. prime example is surrounding ambient and load usage. im of the belief that if the valve is not controlling the proper superheat its either bad or something else is causing the problem. if the charge and all controls check out, it is our responsibility to provide our customers with solutions. If its 95 degrees, and the doors are always opening, odds are the box will never satisfy. so we can either tell the customer to condition the air around the box, chuck it in the garbage, or we can jam a remote bulb t-stat in the evaporator and set it for say 18 degrees off and back on at 41. I appreciate your wanting to do the right thing.
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07-06-2001, 12:29 PM #53
Sometimes when a system is new and still under warranty, and after all standard proceedures are followed will authorize Bernies suggestion. In fact if the situation is known to exist with a given restaurant chain, they may even write a service bulletin. Good idea for an immediate fix in that particular situation Bernie.
:D
Dean
Subzero*psia
Extinction is simply proof of failure to adapt.
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09-06-2001, 01:59 AM #54
thanks sub, i was begining to feel all alone out here.
I think there are a number of options open to us all. As long as we can consistently achive the results were after,
and the unit works properly, it cant hurt.
Im new to this site and i have to say im hooked.
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09-06-2001, 03:11 AM #55
Okay, I confess. I have put a time delay in parallel with the normally closed contacts on lockout relays on a few occasions...lol
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09-06-2001, 03:45 AM #56
Thanks for coming out of the closet gary, i know this is hard.
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09-06-2001, 04:31 AM #57Originally posted by bernie
Thanks for coming out of the closet gary, i know this is hard.
Ugly. The stores we service the least are the stores that work the best. Gary, do you want to start a new thread along these lines? You could call it "Don't adjust anything!"
Dan
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09-06-2001, 04:53 AM #58
Or maybe "Don't Touch That Dial"...lol
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09-06-2001, 07:26 AM #59
Hey... I have no qualms about redesigning a system... just fess up if it messes up.... LOL!!!
I love taking older systems and retrofitting them or bringing them up to speed so to speak. In fact, if I can... I will revamp an older unit rather than a newer unit... just so I can listen to the owners say how good that old one runs compared to the new ones! LOL!! Plus if it was already messed up you can't really go wrong... sometimes you might have to make a service recall to tweak it but what the heck... those oldies are worth it.
I do have to admit that I get carried away sometimes when I am rebuilding though... I can't help it.... is there group therapy for refrigeration engineers?! Imagine the typical refrigeration engineer... he/she must look like a cross between Bob Villa, Tim Allen and somebody from Junkyard Wars... LOL!!!
:D
Dean
Subzero*psia
Extinction is simply proof of failure to adapt.
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10-06-2001, 09:28 PM #60
subzero, I too like to redesign system. I think many system can be improvered by customized to a particular situation. As a minority contractor, I run into many minority business owners where they purchase most of their equipment from; auctions, junk yard, recyle depot, etc... ninty percent of equipment are mis-matched. For someone who is very knowledgeable, that is good, for many who think they know but doesn't, that is bad. There is a big different between REDESIGN and JURY RIG around a problem. I've done my share of designing and redesigning system, probably more than many on this forum.
A wise tech or engineer should recognize limitation of their abilities. They should also recognized wheather a particular situation calls for a "proper repair" or "redesigning" or if its a "jury rig". I have run across many situation that are "jury rigged" or "extreamely poor designing" by some ranking amature or handiman that makes me puke. I am appenhensive to "jury rigging" without doing a throught reseach. One of the many reasons for my original post in this form.
Be Happy
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12-06-2001, 09:37 PM #61
I must admit Dean, there is no better feeling then to take a old piece of equipment and resurrecting it. Making it work better then it ever did, control better and just hum. Gives me Goose bumps!! LOL
Jack
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13-06-2001, 04:56 AM #62
Dear Mr. Wong
Ive just completed reviewing all these posts, yours inparticularly.
You stated that it makes you mad when you see amatuers
"jury rig systems", yet on this thread you have done just that.
You have changed the expansion valves, and you have also installed
a different type of thermostat to control ice. Both of these repairs
are not necessarily wrong, but they due fit the very definition of design change. A customer will stop at nothing to ensure he does not lose all the product he just wrote a check for. A good
service tech should do the same to protect it. Call it what you
like, but as your posts prove design change is sometimes necessary, due to the fact our customers are always pushing the
limits of the equipment we maintain. This has been are good thread to kick around. I'm having fun
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14-06-2001, 10:40 AM #63
ouch,,
Bernie, I am afraid you caugh me on that. I think there maybe a slight mis-interpretation of what I mean. let me rephase my remark hopfully this will help clearify what I mean to say.
first, I am not against design and redesigning a system if it is a benefit to the customer. sometimes that is the only option avaible. as I've mentioned on my previous post many of my minority customer purchased their equipments from auctions, scrap yards etc..mis-match pieces, the only option is to design and redesign. I've done plenty and enjoyed very much doing it.
second, when it come to repair, I like to see a piece of equipment repair as close to its design condition as possible w/o modification.
third, If modification are necessary sometime they are. the tech should throughly understand why they are doing it, what happen after they done it. further they should investigate better way. God bless the creator of this forum, now I can refine my skill further.
fourth, I am against "jury rig" type modification. several examples;(1) thermo overload disc bad, instead of replacing the dame thing, they jumper it. (2) hi pressure switch activate a lot due to over pressure condition, it became a neucens for the customer and the tech, so they bypass it. (3) fusible plug blown and leaks, they removed it and put in a regular solid brass plug. (4) bad fan motor, they replace a motor physically fit but wrong rpm, and wrong amp rating. 5) ice machine with water cool condenser, instead of replacing the bad water pressure regulator, they install a solenoid valve when compressor run - valve open. too many to list......
thank for putting up with mee, I will see what I can do to polish up my english. lolBe Happy
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14-06-2001, 10:47 AM #64
I've notice star war, junkyard war being mention here. Ever wonder what kind of advance refrigeration system they use?????
Be Happy
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