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  1. Please correct me if I'm wrong, but I think you...

    Please correct me if I'm wrong, but I think you have "point of zero pressure" mixed up with "point of no pressure change". If I understand it correctly, the point of no pressure change should...
  2. That's an interesting piece of equipment. I...

    That's an interesting piece of equipment. I haven't heard of it before. Is it pretty much controlled by the infinity thermostat to slowly ramp up and down based on how fast the temperature/humidity...
  3. What you say makes sense, but it's different from...

    What you say makes sense, but it's different from what pecmsg and comfortdoc says. If I go by the formula, and then add 4 psi, I should have 4psi of pressure at the highest point when nothings...
  4. Thread: r12 to 134a

    by ammoniadog
    Replies
    7
    Views
    241

    Why would you WANT to put POE oil in an old R12...

    Why would you WANT to put POE oil in an old R12 cap tube system? Isn't that asking for trouble, or am I worried for nothing?

    As I always understood it, it isn't so much that R134a sucks so much...
  5. Thread: r12 to 134a

    by ammoniadog
    Replies
    7
    Views
    241

    I don't think I would try this conversion on a...

    I don't think I would try this conversion on a cap tube system. I would be afraid of old oil and junk in the system becoming dislodged and plugging up the cap tube. I've heard that POE oil (which...
  6. Replies
    7
    Views
    252

    They make recovery machines that are smaller and...

    They make recovery machines that are smaller and more portable than the ones you're thinking of that some auto mechanics use. It's a machine made to pump refrigerant from a refrigeration system into...
  7. Boiler/chiller water pressure question...

    Lets say I have a building that calculates out to need 40 psi in order to get water to the top of it. Would I just fill the boiler or chiller to 40 psi static pressure and call it good, or do I need...
  8. Replies
    3
    Views
    163

    How is the placement of the stats? Are they in...

    How is the placement of the stats? Are they in good locations away from sunlight or heat emitting light bulbs? Are they on non-exterior walls? Are they away from diffusers that might be blowing on...
  9. Those look pretty similar to a standard manifold,...

    Those look pretty similar to a standard manifold, only with the yellow sticker peeled off.


    http://ecx.images-amazon.com/images/I/41D8-qz%2BgfL._SX342_.jpg



    It'd be better if the PT chart...
  10. Replies
    20
    Views
    1,312

    I'd bet with the amount of heat that guy was...

    I'd bet with the amount of heat that guy was using, the coil leak and the bad txv both happened at the same time. :eek2:
  11. I've never seen a thermostat display the...

    I've never seen a thermostat display the temperature with a decimal point after it. Most Honeywell t-stats are the exact opposite of that concept. They will often let the temperature fluctuate up...
  12. Replies
    36
    Views
    602

    It could be either way. Some hospitals have...

    It could be either way. Some hospitals have their own pager system with their own antenna on the roof that is able to broadcast several miles away to get messages to doctors. There can also be a...
  13. Replies
    36
    Views
    602

    The radio signals that old school pagers use are...

    The radio signals that old school pagers use are much stronger and more robust than the weak crappy signals that your cell phone uses. The pager will work in many places that your cell phone wont.
    ...
  14. No!!! Acetylene cylinders have some type of...

    No!!!

    Acetylene cylinders have some type of membrane inside of them that is soaked in acetone. Propane usually has moisture and other contaminates mixed in with it, and oxygen can become unstable...
  15. Replies
    19
    Views
    374

    Why's it seem like every service call (or almost...

    Why's it seem like every service call (or almost anything else) you've ever done comes with a hilarious story attached to it? I'd bet if someone got a film crew to follow you around it would make a...
  16. Replies
    19
    Views
    374

    OK fine, we'll skip filter drier. :D

    OK fine, we'll skip filter drier. :D
  17. Replies
    19
    Views
    374

    I recommend calling an hvac tech out and paying...

    I recommend calling an hvac tech out and paying him to install refrigerant gauge access taps, checking the refrigerant pressure, leak searching the refrigeration system, finding and repairing...
  18. True, but they haven't lived in the house yet so...

    True, but they haven't lived in the house yet so they won't know what they're missing. :grin2:

    Also, I'm getting that they want to get rid of their oil tank, which the current system uses. Maybe...
  19. It sounds like what you have is a oil fired...

    It sounds like what you have is a oil fired boiler, not a furnace. Lots of people think their boilers are called furnaces for some reason.

    Yes, if you are OK with ductless mini-splits in each...
  20. Replies
    14
    Views
    655

    Because most techs out there want the cheaper and...

    Because most techs out there want the cheaper and easier to install 2 wire start kits that came on a boat from China.
  21. Could there be something like this inside of it?...

    Could there be something like this inside of it?


    https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcT-0XuS3qzPFY7_aQKi2E_xq2s3bEm-3KeIBRXww4DMsd0n07FC
  22. Replies
    15
    Views
    735

    That is pretty impressive! I've never heard of...

    That is pretty impressive!

    I've never heard of anyone using 1" armaflex for air conditioner piping. Is that pretty standard for you guys, or was this a government job or something like that that...
  23. You can change the number of blades on the...

    You can change the number of blades on the propeller and still move the same amount of air, but there's more to it than making sure the pitch is the same. In fact, the pitch wont be the same. Also,...
  24. Replies
    42
    Views
    1,245

    You were told right that air conditioning usually...

    You were told right that air conditioning usually takes a longer time to recover. You were told wrong when you were told it costs more to shut the unit off and/or run it less for a few hours.
    ...
  25. How would that help anything? That would just...

    How would that help anything? That would just make it overflow inside of the ductwork instead of onto the floor. Why would that be an improvement?

    Is it an out of sight, out of mind type of...
  26. Replies
    28
    Views
    873

    What's the big deal with it? R290 is used in...

    What's the big deal with it? R290 is used in many furnaces to heat the house, and many stoves to cook with, and even in some vehicles that are driven on the road. Why's it ok there, but in the air...
  27. Replies
    14
    Views
    674

    It should be fine to leave it there if you have...

    It should be fine to leave it there if you have no other choice.
  28. Replies
    42
    Views
    1,245

    I'm with Wild. I'm also baffled by the amount of...

    I'm with Wild. I'm also baffled by the amount of people here who believe it cost's more to have a setback programmed into the thermostat.

    The ONLY way it should cost more is if you have a dual...
  29. Replies
    19
    Views
    1,192

    I was wondering about the small rubbermaid tote...

    I was wondering about the small rubbermaid tote looking thing to the right of that big tank. :D
  30. Replies
    7
    Views
    455

    In my area Carrier hires out of the local...

    In my area Carrier hires out of the local Pipefitters union.

    I worked for them for a short time several years ago when I was a 2nd year apprentice. I usually rode with someone, or drove my own...
  31. Replies
    31
    Views
    1,439

    Both of your guys make good points. It's easy to...

    Both of your guys make good points. It's easy to get stressed out when you're in the middle of something and the boss calls to ask how long it's going to be and then he tells you about other calls...
  32. Replies
    19
    Views
    1,192

    What kind of gas regulators are those? Is it...

    What kind of gas regulators are those? Is it 2psi natural gas? It seems like the vent lines might be too small, and I don't like tieing them together if I can help it. I hope you don't have...
  33. Replies
    42
    Views
    1,245

    Common sense says a lower heating setpoint should...

    Common sense says a lower heating setpoint should use less gas than a higher one. That means a setback should be saving you money.

    Also, most of the stuff I've read on this site has said that...
  34. Replies
    20
    Views
    583

    In your first picture it's kind of hard to see,...

    In your first picture it's kind of hard to see, but does that little red tubing coming off of that thing that looks like a water filter have any thing to do with this unit? If so, that might be your...
  35. Replies
    7
    Views
    367

    If you pump the nitrogen through the condenser,...

    If you pump the nitrogen through the condenser, it will condense and turn to liquid. Then it will be -320 degrees F. :cheers:
  36. Replies
    6
    Views
    340

    It sounds kind of like making a custom snow cone....

    It sounds kind of like making a custom snow cone. A squirt of blue and a squirt of orange. Did it work after you fixed the charge?
  37. Replies
    23
    Views
    857

    Don't put in an air sensing thermostat. If you...

    Don't put in an air sensing thermostat. If you do the coil will freeze up and the compressor will never shut off.

    A plugged up cap tube is a common problem with these small 134a coolers, but...
  38. I don't have much experience with communicating...

    I don't have much experience with communicating air conditioners, but I would think that a standard 2 stage condensing unit would work the same weather the infinity board in the furnace is...
  39. Replies
    7
    Views
    375

    According to code (17.7.5.3.1 of NFPA and/or...

    According to code (17.7.5.3.1 of NFPA and/or 606.2 of the IMC according to a google search I just did) any commercial air handling system of more than 2000 cfm is supposed to have a duct smoke...
  40. Why do car doors have key locks, when you can...

    Why do car doors have key locks, when you can easily get in with a slim-jim tool? It's the same reason, because they want to keep people out and they know that 99% of the population doesn't have a...
  41. If you are near a Harbor Freight, check out this...

    If you are near a Harbor Freight, check out this 100 piece security bit set for $9.49. It comes in handy every once in a while.






    http://i44.tinypic.com/2i03err.jpg
  42. Replies
    14
    Views
    868

    I can't take credit for the first picture up...

    I can't take credit for the first picture up there. I was searching google for some random pics of totes for you, and that one came up. I thought it was kind of funny, so I through it up here.
    ...
  43. Thread: gas line

    by ammoniadog
    Replies
    15
    Views
    738

    In my area, both galvanized and copper are used...

    In my area, both galvanized and copper are used for gas lines all of the time. From what I've been told, we supposedly have cleaner methane around here, with less sulfur in it than gas that's...
  44. I doubt most hardware stores would have 1-1/4"...

    I doubt most hardware stores would have 1-1/4" I.D. copper, but they might. If there is a real plumbing place around, it would be worth asking them if they have any ACR pipe. Most plumbing places...
  45. Replies
    14
    Views
    868

    Several years ago I had to do a service call at...

    Several years ago I had to do a service call at some kind of rec. building owned by a sail boat club on an island on Lake Minnetonka (a medium sized lake a few hours south of you ;)). I grabbed my...
  46. Replies
    14
    Views
    868

    How about something like this... ...

    How about something like this...





    http://pamelasusan.typepad.com/.a/6a010535be1d5d970b017eea11f182970d-450wi
  47. BB brought up a good point. Sometimes with R414b...

    BB brought up a good point. Sometimes with R414b you can have bubbles, even when the system has enough refrigerant. I recommend torching the receiver like I said to make sure the receiver has...
  48. There are other ways to see if you have a full...

    There are other ways to see if you have a full sight glass, even when there's no sight glass. Did you check for subcooling? Did you try torching the receiver? That's where I would start. When the...
  49. Replies
    784
    Views
    30,406

    I've got a weird rash on my foot.

    I've got a weird rash on my foot.
  50. Replies
    20
    Views
    1,137

    Would you really file a claim for $500.00?

    Would you really file a claim for $500.00?
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