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  1. Thread: Subcooling

    by desol
    Replies
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    1,340

    Hey Timebuilder. I'm following you but I'm not....

    Hey Timebuilder. I'm following you but I'm not. :)

    Can you expand a little more on the second half of your statement. Cheers.
  2. Thread: Subcooling

    by desol
    Replies
    45
    Views
    1,340

    Hey Paul. :) I think you have it backwards, as...

    Hey Paul. :) I think you have it backwards, as that's exactly the opposite of what I was taught in school. Fixed orifice is charged by superheat. TX is charged by subcooling, however this isn't about...
  3. Thread: Subcooling

    by desol
    Replies
    45
    Views
    1,340

    Hey Jayguy. Thanks for the reply... Ok. I...

    Hey Jayguy. Thanks for the reply...

    Ok. I don't understand how that's possible. I do understand that when charging, as I add more refrigerant to the system my head pressure increases as well as my...
  4. Thread: Subcooling

    by desol
    Replies
    45
    Views
    1,340

    Subcooling

    Hey guys. 3rd year commercial/residential mechanic here. I'm getting conflicting info from different sources regarding subcooling, so I thought I'd ask here to see what you guys thought. TXV...
  5. Replies
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    1,254

    Thanks guys...that helps. You never know quite...

    Thanks guys...that helps. You never know quite what's right with all this fractionalization and blends, etc...recovery...recharge. They make it seem like it's worse than it really is...
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    758

    I realize that, and I understand the need to...

    I realize that, and I understand the need to calculate target superheat. He wasn't willing to pay for more than a few hours, braising, vacuum, etc included. I was at the literal end of my time...in...
  7. Replies
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    Putting recovered 410a back into a system

    Hey guys. So they say to only charge 410a as a liquid. Scenario: guy at at work recovers 5.8lbs of 410a into vacuumed recovery cylinder. Then, in order to get only liquid back in, uses the recovery...
  8. Replies
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    758

    Hey...maybe it was less, I don't know. small...

    Hey...maybe it was less, I don't know. small furnace...probably 60,000 btuh. 3 speed blower on high. So, maybe 1000 cfm? Not sure. Pressures weren't terrible at around 55 X 180. colder day out.
    ...
  9. Replies
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    758

    Hi. No. It was fixed orifice. I adjusted by...

    Hi. No. It was fixed orifice. I adjusted by adding 22 until I had 11 degrees superheat. I think line temp was about 42-43 degrees and sst was around 32 degrees (55psi).
  10. Replies
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    758

    I set superheat at around 11 degrees. subcool not...

    I set superheat at around 11 degrees. subcool not sure...didn't check. Fan was on high. probably 1500 cfm's. I was referring to my supply temp at the registers. Not sure how much I had delta t across...
  11. Replies
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    Undersized suction line

    Hey guys

    So, I got a residential call the other day(small town). The guy apparently had called someone about sizing and installing his own lineset, as the existing lineset he had had become kinked...
  12. Replies
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    1,570

    Interesting. So many current gas valves are...

    Interesting. So many current gas valves are running on internally rectified DC even tho they are stated as 24vac?

    So one would have to have an old AC operated coil and an old mechanical thermostat...
  13. Replies
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    1,570

    Maybe what I thought I saw was happening was...

    Maybe what I thought I saw was happening was simply a shorted hot. I hate misinformation. Yes, If you short the hot to ground amps will go up...and you'll see a puff of smoke come out the top of the...
  14. Replies
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    1,570

    "...if you jump r-w 'without' removing one of the...

    "...if you jump r-w 'without' removing one of the wires."

    This is what I meant to say. Wanted to edit the original post but couldn't...so I thought I'd ammend.
  15. Replies
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    1,570

    Trust me guys....I've seen it done and I've done...

    Trust me guys....I've seen it done and I've done it myself a few times. On mercury bulb analog thermostats, if you don't remove one of these wires and you jump the roof top unit(etc) r and w, you...
  16. Replies
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    Jumping heat...can blow anticipator

    Hi. Can someone please explain why an anticipator on a mechanical thermostat will blow if you jump r-w with removing one of the wires. And also, which wire is best to remove.

    I thought amperages...
  17. Replies
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    2,960

    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...
  18. Replies
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    1,813

    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...
  19. Replies
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    1,813

    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?
    ...
  20. Replies
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    19,802

    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....
  21. 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!
  22. Thread: No superheat

    by desol
    Replies
    20
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    3,134

    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...
  23. Thread: No superheat

    by desol
    Replies
    20
    Views
    3,134

    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.
  24. Thread: No superheat

    by desol
    Replies
    20
    Views
    3,134

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

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

    by desol
    Replies
    20
    Views
    3,134

    Good advice. Thanks!

    Good advice. Thanks!
  26. Thread: Injecting dye

    by desol
    Replies
    34
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    4,544

    No doubt... :)

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

    by desol
    Replies
    34
    Views
    4,544

    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....
  28. Thread: No superheat

    by desol
    Replies
    20
    Views
    3,134

    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)......
  29. Thread: Injecting dye

    by desol
    Replies
    34
    Views
    4,544

    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.
  30. Thread: Injecting dye

    by desol
    Replies
    34
    Views
    4,544

    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)...
  31. Thread: Injecting dye

    by desol
    Replies
    34
    Views
    4,544

    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...
  32. Thread: Injecting dye

    by desol
    Replies
    34
    Views
    4,544

    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.
  33. Thread: Injecting dye

    by desol
    Replies
    34
    Views
    4,544

    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.
  34. Thread: Injecting dye

    by desol
    Replies
    34
    Views
    4,544

    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...
  35. Thread: Injecting dye

    by desol
    Replies
    34
    Views
    4,544

    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...
  36. Replies
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    3,668

    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.
  37. Replies
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    564

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

    No one knows the difference? ...or has any input??
  38. Replies
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    564

    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...
  39. Thread: Vacuum/Charging

    by desol
    Replies
    12
    Views
    2,487

    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...
  40. Thread: Vacuum/Charging

    by desol
    Replies
    12
    Views
    2,487

    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.
  41. Thread: Vacuum/Charging

    by desol
    Replies
    12
    Views
    2,487

    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...
  42. Thread: Vacuum/Charging

    by desol
    Replies
    12
    Views
    2,487

    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...
  43. Replies
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    756

    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.
  44. Replies
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    756

    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...
  45. Replies
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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..:)
  46. Replies
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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...
  47. Replies
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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...
  48. Replies
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    1,206

    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...
  49. Replies
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    2,194

    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...
  50. Replies
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    756

    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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