Do it yourself Refrigeration and Air Conditioning

   / Do it yourself Refrigeration and Air Conditioning #61  
View attachment 3804328

The inside the unit factory breakers stamped made in China and they have never tripped…
I think that is to @grsthegreat's point about the speed of tripping on a fast fuse vs a circuit breaker more than "Brand Name" vs "Off brand"/"Made in China" in particular.

The on equipment/near equipment fuses are there to limit the damage to the equipment and the upstream breaker is there to prevent damage to the wires. They have different jobs/functions to my way of thinking. In my own limited experience, all of the large equipment installations that I've been on deck for had detailed specifications on minimum current, maximum current, and type of fuse to be installed.

All the best,

Peter
 
   / Do it yourself Refrigeration and Air Conditioning
  • Thread Starter
#62  
If it were me, I'd buy a second board... I detest this trend in HVAC in particular of not stocking spares of even current equipment, especially for equipment with known track records of failures.

I can't tell from your photo, but there might be an electrical technician nearby who could repair the board, especially if you didn't lose a microcontroller. I do think I'd be wondering a bit about why some many pieces let out the magic smoke at once, and I would want to develop a plan to find and address the underlying cause. That's a lot of broken items.

Schrader valves? Without a gas tight over cap? That seems like a worse than poor design from this armchair. These days, at a distance, Carrier seems to have this diversity of designs, some good, and some in the pig's breakfast category, or worse.

Personally, I think that this lean manufacturing / just in time stocking concept is for the bean counters and the bean counters only. If one needs resilience, some amount of proactive planning and stocking is in order. (Not picking on you, just generally) A hospital I worked at had a pair of 1MW diesel generators that could cover 2/3rds of the hospital power in case of an outage, but they only had three days of diesel in the tank. I once asked what there plan was if the outage lasted longer than three days in, say, an earthquake. There response was that they would get a refill from somewhere, not even, "oh we have contracts with two fuel suppliers for refueling in case of emergency..." (and much less, no consideration of possible "force majeure" clauses in said contract post disaster...) To liven things up a bit more, the hospital was a mile or so from the San Andreas fault, specifically the segment most likely to rip in the next big one.🙄 Yeah, I don't expect that hospital to be functioning when the big one hits.

I have done a lot of forward resiliency planning over the years. For items requiring sustained uptime, I tend to think about not having one 50T unit, and instead think of three or four 20T units, with resilient control management that can failover gracefully. With multiple small units in parallel, they can be loaded to efficient levels, the hours on service can be rotated and equalized, and servicing can be done without generally impacting user needs. It also is more cost effective than full duplication of resources. Yes, it requires a little more planning, but single point failures don't take everything down.

All the best,

Peter
I was pushing for 7 package units but the cost was higher and projected time frame longer.

Also a lot of work would be required inside the sterile areas, new circuits, load calculations, more items to maintain, etc.

We had a very good run of 30 years with the original built up unit with the Carlisle Compressors… it’s the failing coils that got us combined with R22 refrigerant dependency.

It takes over 60 pounds to charge the system…

As for fuel we are limited by the county.

We have long standing fuel contracts that meant nothing during power safety shutoff..,

I was self hauling using all my 5 gallon tractor diesel containers to tide us over.

Supplier said you and everyone else was calling for fuel.

We do have a county agreement where county will supply fuel if a disaster is declared using county fuel and county fuel trucks
 
   / Do it yourself Refrigeration and Air Conditioning
  • Thread Starter
#63  
This project install started June of last year… all time off and leaves canceled pending reliable HVAC in place…

I’m holding a substantial sum pending completion.

The inside the unit wiring is a almost a rats nest as jumpers needed to function are in place while waiting on the new circuit board.



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   / Do it yourself Refrigeration and Air Conditioning
  • Thread Starter
#65  
   / Do it yourself Refrigeration and Air Conditioning #67  
A few years back some idiots at our hospital took it upon themselves to plug things like soda machines in the emergency outlets. While plugging respirators and such in non backup outlets.

Guess what happened when power failed. Outlets are labeled with placards also.
 
   / Do it yourself Refrigeration and Air Conditioning
  • Thread Starter
#68  
Will California allow you to use it haha.

Do they still limit exercise cycles on hospital standby in calif?
Yes and annual reporting with documentation and random onsite audits plus a $800 annual licensing fee to the Air Management District.

Strict cap on exercise and testing hours.

For years weekly exercise was policy but now only monthly to comply with air district.

Works out to oil and filters changed and coolant and fuel analysis ever 25 to 30 hours annual run time.
 
   / Do it yourself Refrigeration and Air Conditioning
  • Thread Starter
#69  
A few years back some idiots at our hospital took it upon themselves to plug things like soda machines in the emergency outlets. While plugging respirators and such in non backup outlets.

Guess what happened when power failed. Outlets are labeled with placards also.
Weekly I check critical areas and not so much anymore but I would find heating devices such as patient bed warmers plugged into Red Backup Generator Hospital Grade Outlets and patient monitors plugged into non Backup Hospital Outlets.
 
   / Do it yourself Refrigeration and Air Conditioning #70  
I have seen the same in most healthcare facilities. The red backup outlets don't seem to register with staff.

All the best,

Peter
 

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