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  1. Replies
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    Walk in cooler - operation

    Can someone point me to an explanation of the sequence of operation for a walk in cooler? It's for a project at school and the instructor refuses to explain the simple operation of the unit (even tho...
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    I kinda resonate with the first two replies,...

    I kinda resonate with the first two replies, because i like math. Visualizing cylinder motion, volume and outcome is a bit tough...
    Hvacmedic is kinda saying the opposite of Ref Johnny...

    This...
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    Compression ratio

    Can someone help me understand this?

    As suction pressure decreases...compression ratio goes up.

    I simply can't see how less gas at suction equals a higher ratio and more heat at discharge?
    ...
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    This is the Ask Our Pro's forum. In order to post...

    This is the Ask Our Pro's forum. In order to post a response here, you must have verified qualifications and have been approved by the AOP Committee. You may ask a question by starting a new thread....
  5. That happened to me not too long ago on a 410a...

    That happened to me not too long ago on a 410a RTU. Burnt my hand getting it to shut...
    Pissed me right off. Was a harsh reminder to wear gloves!
  6. Thread: No superheat

    by desol
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    1,987

    That's what i ended up pinpointing...inadequate...

    That's what i ended up pinpointing...inadequate air. I made a recommendation to install a multi-speed blower for his old, small furnace.
    He said, he doubts it'll happen. lol. It's been working fine...
  7. Thread: No superheat

    by desol
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    1,987

    Wow. That chart and diagnosis was great. Thanks!...

    Wow. That chart and diagnosis was great. Thanks!
    I think it was 13 seer...not totally sure. 6-8 year old unit.
  8. Thread: No superheat

    by desol
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    1,987

    Not sure what it was...i have a hygrometer on...

    Not sure what it was...i have a hygrometer on order.
  9. Thread: No superheat

    by desol
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    1,987

    Good advice. Thanks!

    Good advice. Thanks!
  10. Thread: Injecting dye

    by desol
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    2,834

    No doubt... :)

    No doubt... :)
  11. Thread: Injecting dye

    by desol
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    2,834

    True enough...but I've seen guys spend hours with...

    True enough...but I've seen guys spend hours with leak detectors and still find nothing. I HAVE however, had great luck with soap at obvious locations.
    I suppose i should break down and get one....
  12. Thread: No superheat

    by desol
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    1,987

    No superheat

    So, I've gotten a few of these lately.

    R22 systems, low outdoor ambient (64 degrees F)...hi side 155 psi, low side 62 psi, saturated suction temp 34-35F, suction line temp 35F (zero superheat)......
  13. Thread: Injecting dye

    by desol
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    They've had the unit for quite a while(3-4...

    They've had the unit for quite a while(3-4 years)...it stopped cooling last fall.
  14. Thread: Injecting dye

    by desol
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    2,834

    Actually, i did tell the owner that originally. I...

    Actually, i did tell the owner that originally. I still wanna check back tho. I'd rather catch the leak early (hopefully)...
  15. Thread: Injecting dye

    by desol
    Replies
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    2,834

    I did spray/soap around the terminal plug on the...

    I did spray/soap around the terminal plug on the compressor. Checked the schrader cores and service valves/caps. I also tightened a few of the fittings at the TXV.
    Didn't notice any oil stains. I...
  16. Thread: Injecting dye

    by desol
    Replies
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    2,834

    Soap has always worked pretty good for me. This...

    Soap has always worked pretty good for me. This is my first time using dye. Electronic is good too...
    It's good to have 2 or 3 different leak detection tools handy.
  17. Thread: Injecting dye

    by desol
    Replies
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    2,834

    No worries...no confusion. I think it was the...

    No worries...no confusion.

    I think it was the Spectronics dye. Bright yellow...and stains like no tomorrow.
  18. Thread: Injecting dye

    by desol
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    2,834

    Hi Doug. Is there any particular reason why you...

    Hi Doug. Is there any particular reason why you would do it in that order?

    The unit was fairly new....compressor was scroll. I was able to pull down(not hold) to 350 microns...which tells me the...
  19. Thread: Injecting dye

    by desol
    Replies
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    2,834

    Injecting dye

    Hey guys. Wondering...i'm working on a split residential unit that had lost all it's gas. I leak checked it for quite a long time at 200 psi of nitrogen and soap. Couldn't find the leak. Left it...
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    I'd check the flame sensor(or pilot ground),...

    I'd check the flame sensor(or pilot ground), blower leakage to the burner compartment and ignition module.....etc.
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    No one knows the difference? ...or has any input??

    No one knows the difference? ...or has any input??
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    Honeywell Aquastats

    Anybody know if there's a major difference between the surface mount vs immersion type bulbs? l6006c is surface mount.

    I took an immersion type bulb and strapped it to a pipe unaware that I was...
  23. Thread: Vacuum/Charging

    by desol
    Replies
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    1,661

    In order for me to be comfortable with...

    In order for me to be comfortable with understanding a concept, i need to know the deeper sides the story. ...so, there is only de facto "liquid"(that kind that can damage the unit) in the last half...
  24. Thread: Vacuum/Charging

    by desol
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    Yes, there is....i just thought i'd ask here as...

    Yes, there is....i just thought i'd ask here as well...for good measure and not to look like a retard.
  25. Thread: Vacuum/Charging

    by desol
    Replies
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    1,661

    Thanks guys. Disaster averted. So, as i charge...

    Thanks guys. Disaster averted.

    So, as i charge vapour into the low side(without the unit running) where will the charge migrate to...the evaporator? ...some into the low side of the compressor? I...
  26. Thread: Vacuum/Charging

    by desol
    Replies
    12
    Views
    1,661

    Vacuum/Charging

    Hi. I'm doing my AC ticket(2nd year) and need a little advice. I have the pump pulling a vacuum overnight on the unit. The micron gauge had pulled down to about 1000 microns before i left it for the...
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    Excuse me? I'm not sure what your getting at?...

    Excuse me? I'm not sure what your getting at?
    You have to be more 'specific'?

    Thanks.
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    I will... :) Good idea. It's just that i don't...

    I will... :) Good idea.
    It's just that i don't have that much time...this was where i first posted...it's getting late and i was hoping for a little 'feedback' before i hit the sack...and i have to...
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    C'mon... There's alot of knowledgable guys...

    C'mon...

    There's alot of knowledgable guys here...someone must have seen this somewhere or have some kind of input? I can't be the only one that's fussing around with relays..:)
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    Thanks for the link. :) No i haven't worked on a...

    Thanks for the link. :) No i haven't worked on a system like this before...looks sweet tho!

    Still...you would think you could adjust the fan profiles...and you would still need fresh air(air...
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    Unless it's an 87...it's most likely going to be...

    Unless it's an 87...it's most likely going to be a 90...which is most likely condensing...which is most likely direct vent(but not necessarily)...so you won't have to WORRY about primary, secondary...
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    I could be wrong on this system...but most...

    I could be wrong on this system...but most variable speed furnaces have different ramping profiles for cooling and heating. Have a look in your manual and see if you can up the cooling speed a...
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    Depending on where your located...that exhaust...

    Depending on where your located...that exhaust pipe is supposed to be insulated to prevent freeze up...also...i know the exhaust terminations we installed needed to be 12" OUT from the outside of the...
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    I was kind of thinking that i should 'parallel'...

    I was kind of thinking that i should 'parallel' off of the two wires going to the furnace control(g,c) from the vent fan...to the coil on the relay. Then put the 'g' wire going up to the thermostat...
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    Hi! This is my first post here... :) I have to...

    Hi! This is my first post here... :)

    I have to go to a clients house in the morning and he's giving me a hard time about this...and i've talked to some other shops and no one seems to be able to...
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