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    Tapatalk makes it easy to upload an image or file...

    Tapatalk makes it easy to upload an image or file from your phone. They have an upload box directly below where you type in your message, so all you need to do is can copy and paste.

    If you're...
  2. Thread: Signature

    by icemeister
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    Oops!....I just noticed you're a Regular Member. ...

    Oops!....I just noticed you're a Regular Member. To have the ability to add a Signature you need to have Pro Member status.

    Go here to apply for Pro: ...
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    As I explained earlier, the envelope defines the...

    As I explained earlier, the envelope defines the limits of normal operation. Conditions outside these limits are considered as potentially damaging and/or unsafe, so protective devices are required...
  4. Thread: Signature

    by icemeister
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    Since you're using a cell phone, the site senses...

    Since you're using a cell phone, the site senses that and switches from Full Site Mode to Mobile mode. Some regular features like editing your profile to add a Signature aren't available in Mobile. ...
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    The operating envelope defines the limits of...

    The operating envelope defines the limits of normal operation as determined by the compressor manufacturer.

    The compressor's thermal/overload protection is designed to protect the motor from...
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    The system components you select should have the...

    The system components you select should have the information you're looking for listed on their data plate. For example, Copeland's condensing units usually include "Max Fuse" as the Maxiumum...
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    Copeland's Electrical Handbook has a section...

    Copeland's Electrical Handbook has a section defining fuse sizing:

    812644
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    To get decent search results on this site I...

    To get decent search results on this site I always use the advanced search, which is in the second blue navigation bar (under the logo). The advanced search has two tabs, one for single content type...
  9. Traditionally (prior to high-glide blends) when...

    Traditionally (prior to high-glide blends) when selecting our system components, we simply used the saturated temperature of the refrigerant at the evaporator and at the compressor suction &...
  10. The top chart on p.12 is dealing with net...

    The top chart on p.12 is dealing with net refrigerating effect (NRE) in terms of Btu/lbm where you'll see that R404A is the lowest, however the next chart deals with the mass flow per ton where R404A...
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    It's true that back in the early days a POE oil...

    It's true that back in the early days a POE oil being used in HVACR there was a strict warning from OEMs to use a dedicated manifold gauge set for POE systems. This rule, along with the one for 5%...
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    I used the NuCalgon silicon spray: ...

    I used the NuCalgon silicon spray: http://www.nucalgon.com/products/aerosols/lubricants/food-grade-silicone
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    The air pocket you describe is formed during...

    The air pocket you describe is formed during harvest when the ice is melted away from the back side of the ice sheet.. The longer the harvest time, the more ice is melted away.

    As UmmScott said,...
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    Next time, using your iPhone's image app, crop...

    Next time, using your iPhone's image app, crop the picture just a little, save it and then upload it your post.
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    The B-Series air-cooled machines have a fan cycle...

    The B-Series air-cooled machines have a fan cycle pressure control which cuts out at 200 psig and in at 250 psig. So the fan will usually cycle off if the machine is in a normal room temperature...
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    You have it correct...Top Notch mean excellent or...

    You have it correct...Top Notch mean excellent or best. So thank you. :)



    That's a good question. I think in practice the error created by not taking pressure drop into account is...
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    First, thanks for posting this in Imperial units....

    First, thanks for posting this in Imperial units. It's so much easier for us metrically-challenged Yanks. ;)

    The suction line pressure drop should always be taken into consideration when...
  18. You would need to know the entering wet bulb...

    You would need to know the entering wet bulb temperature of the air as well as the design specifics of the coil (size, rows deep, # of tubes high, tube size, circuiting, etc) and then run it all...
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    Does this "casting" look something like this? ...

    Does this "casting" look something like this?

    https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcRqHIkZwTalGzCeZ4r7IIUn9o2Xabvij7TIq_X0cAKaEotTkUrZSQ&s
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    Traditionally, low temperature condensers are...

    Traditionally, low temperature condensers are sized at a 10°F TD to oversize them for the higher post-defrost load and for the higher efficiency form the lower condensing temperature.

    Your...
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    Yes, decreasing the condenser TD is the same...

    Yes, decreasing the condenser TD is the same thing as oversizing the condenser.



    The TD is deceased to increase the condenser capacity.



    COP (Coefficient of Performance) is a way of...
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    The short answer is that the condenser is...

    The short answer is that the condenser is typically selected at the normal design conditions for saturated suction and condensing temperatures (SST/SCT). The post-defrost pulldown is accounted for...
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    Regardless of which defrosting method used, the...

    Regardless of which defrosting method used, the evaporator and all of its electrical would still need to be rated as "explosion proof". There are a number of different NFPA/NEC ratings for hazardous...
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    You could do that, but then the remaining...

    You could do that, but then the remaining compressors would need to run at a -18°F suction temperature. That would require bigger compressors and more horsepower...ie, not a very efficient way to go.
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    Do you mean use EPRs on the two medium...

    Do you mean use EPRs on the two medium temperature evaporators and eliminate the low stage compressor?
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    The discharge pressure of the low stage...

    The discharge pressure of the low stage compressor would be the same as the suction pressure of the high stage compressors. That's also called the interstage pressure.
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    :ditto: A -40°F box would require a design...

    :ditto:

    A -40°F box would require a design evaporator temperature of around -50°F. This would put this application outside the operating envelope of the standard Copeland Scroll compressor. ...
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    The diagram shows an accumulator marked "ACC"...

    The diagram shows an accumulator marked "ACC" upstream of the compressors.

    Floating suction? I dunno. I was thinking that 3-way valve might even be a hot gas bypass for capacity control on...
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    QUOTE=crazzycajun;25789249]Icemeister it looks...

    QUOTE=crazzycajun;25789249]Icemeister it looks like a crappy way to control a satellite Or defrost if I’m reading this schematic right ( which I probably am not)[/QUOTE]

    Yes, that 3-way valve is...
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    The system is a compound two-stage rack. The two...

    The system is a compound two-stage rack. The two medium temp, high stage compressors are running at +14°F SST and the low temp booster compressor is at -18°F SST, discharging to the suction of the...
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    As we have done in the past 25+ years, just use...

    As we have done in the past 25+ years, just use the capacity data for the old refrigerant which the new one replaces. For example, use R134a capacity information for an HFO refrigerant like R513A.
    ...
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    Refrigerants and Lubricants Approved For Use in...

    Refrigerants and Lubricants Approved For Use in Copeland Compressors (2018):

    811821
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    So assuming the hoses contained air at 0 psig and...

    So assuming the hoses contained air at 0 psig and all of that air was introduced to the system when he charged without first purging his hoses, the NCG would be at roughly 200 psig on a 13 SEER R22...
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    A lot would depend on what was in the hoses (and...

    A lot would depend on what was in the hoses (and at what pressure) before he added the refrigerant to the system. The space the non-condensibles occupy during operation would then depend upon where...
  35. Is it a flooded evaporator or direct expansion?

    Is it a flooded evaporator or direct expansion?
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    With one out six fan inoperative, the condenser...

    With one out six fan inoperative, the condenser TD would increase by 20%...ie, (6 / 5). The typical TD for a medium temp rack would be 15°F, so in your case with one fan out I would expect the TD...
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    "Condenser return" is the liquid return line from...

    "Condenser return" is the liquid return line from the condenser.

    "Hold back valve" is another name for an inlet pressure regulator (IPR). An IPR in the condenser return would typically work in...
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    Thanks, I couldn't tell from the picture. It...

    Thanks, I couldn't tell from the picture.

    It looks to me to be the inlet pressure regulator (A8L/A81L) with the solenoid to open when energized. As I recall, this was used on some Tyler racks...
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    Is it piped in the receiver bypass? The model...

    Is it piped in the receiver bypass?

    The model number of the valve will tell you what it's function(s) are.

    That looks like an A81LB or A82LB Flocon valve. The L designates that it's a...
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    A common way to create a permanent seal is to...

    A common way to create a permanent seal is to apply an epoxy floor around the box which can form a coved base. I've seen this done many times in supermarket prep room and cooler floors. It's best...
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    A much simpler solution would be to seal between...

    A much simpler solution would be to seal between the box and the floor.
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    So it may never get used. In my experience this...

    So it may never get used. In my experience this would not only apply to an "untidy" store, but to just about any store these days.

    When I worked for a market chain, I was told to go to a newly...
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    It's a drain for when the customer cleans the...

    It's a drain for when the customer cleans the case.
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    What's the model number?

    What's the model number?
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    For the compressor type, I assume you mean a...

    For the compressor type, I assume you mean a Copeland "Scroll" and not "Screw". They did make screws starting at 20 hp at one time but I believe they have been phased out. The Copeland ZF scroll is...
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    Coconut water is considered Nature's Gatorade. ...

    Coconut water is considered Nature's Gatorade. It's very popular among the drinks sold by street vendors and tiendas here in Ecuador.
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    I agree with the lower temperature for floral...

    I agree with the lower temperature for floral boxes. I had a number of my customer require 36°F or lower saying this is what was being recommended by their flower distributors. I heard the same...
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    Chrome is my everyday browser but I haven't been...

    Chrome is my everyday browser but I haven't been able to load the Copeland OPI using Chrome for several months, so I use Firefox for that. In convenient, but it works.
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    I learned something new today from this. I had...

    I learned something new today from this. I had no idea there was such a thing as a Scott T 3-phase motor.

    I installed one maybe 8 years ago but never noticed the difference. Thankfully I...
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    Is the vacuum pump oil getting milky colored? ...

    Is the vacuum pump oil getting milky colored? That would be a sure sign of a lot of moisture in the system and could also explain why you hit a wall at 1700 microns.
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