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  1. What is the difference between a two stage and...

    What is the difference between a two stage and single stage pump?
  2. Replies
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    Vacuum pump CFM, does it matter?

    I was talking to someone that the CFM really relates to how fast it pumps the system down. Most technicians choose higher CFM pumps so that it trims the time they are with each customer. I'm...
  3. I think I'm going to pass on it. I need a good...

    I think I'm going to pass on it. I need a good pump that I know works, not something I'm going to have to tinker with. The price looks tempting, but I"m going to let it pass.
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    Goss Air/Acetylene

    I just picked myself up an Acetylene "B" tank. It came with a Goss regulator and Goss AA-1 Handle (screw in type) and BA-3 Tip. I believe BA-3 is going to be too small for HVAC linesets. I was...
  5. Possible Broken Robinair Cooltech Vacuum Pump

    I saw this at a pawn shop around my area. The shop originally wanted 125, but we noticed the oil was overfilled and when we drained and turned the unit on it only pulled down 640 microns on my...
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    1,334

    I do know about the "thermal paste" situation. I...

    I do know about the "thermal paste" situation. I remember many technicians using wet rags for heat controll. Is there a chart or guidelines regarding tips and pipe diameters? Are tips...
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    Thanks, What is the difference between the B...

    Thanks,

    What is the difference between the B tank and MC tank? Also I do see a lot of videos of people brazing with just straight acetylene. What type of tips do beginners typically get? What's...
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    Begenners Brazing kit

    Just want to get some opnions on what type of brazing set is good and types of gasses.

    I see some people use just straight acetylene v.s. oxy-acetylene. I was reading that it's better because...
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    Assuming the leak is in the coil, the tech was...

    Assuming the leak is in the coil, the tech was indicating they have to order the coil from trane, and they may not have it. He was indicated it would be better to replace the whole system (quoted me...
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    The air handler is a Trane that is from 2005, but...

    The air handler is a Trane that is from 2005, but the outside heat pump and coil is from 1998. I couldn't get a model number from the coil. The outdoor heatpump is a XE 1000 3.5 ton. Yes the rust...
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    System Leak

    So I turned my A/C on (for the first time). I was getting coil freezing (evap). I knew because when I took the cover off from the unit the entire coil was a block of ice. I defrosted it and...
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    I identified the high/low side. The service...

    I identified the high/low side. The service ports are there. I opened up the high and I can see the needle right in front. But on the low (either the needle is not there or it's too deep. I can't...
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    Can't find Schrader valve stem

    I have a set of gauges. I went to take the cover off my condenser unit and put the high side on. My gauge registered. I took the cap off the low side and didn't see any Schrader valve stem. I put...
  14. What type of Thermometers do you guys use when doing superheat calc.

    You know when you are taking the temp of the suction line and indoor/outdoor dry bulb temp. Are non-contact therm ok? I was looking at these.
    ...
  15. That's good to know. The furnace is a different...

    That's good to know. The furnace is a different matter.

    It's a Lennox G12. It was made in 75. Everytime I get someone to come to my house they want to replace it with a furnace that matches up...
  16. Thanks this is very informative. Why would the...

    Thanks this is very informative.

    Why would the evap coil be .5 tons oversized. Is this normal?
  17. What is the tonnage and Sheer for a Lennox HS26-261-1P condenser unit?

    I believe the unit its about 5 years old or so. The model is HS26-261-1P. The evaporator coil is C22-31-TXV-2. I believe they were both replaced at the same time.
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    So what is the correct method.

    So what is the correct method.
  19. Replies
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    Picking the right CFM for your A/C

    I had a contractor come to the house. I have an old house built in 1974. The ductwork is not the top design. It's a small house roughly 1400 sq ft. One of the major problem is the upstairs is not...
  20. Is it possible to calculate the CFM of a blower motor?

    I have a old furnace. The blower motor had been changed. I can see the RPM of the motor but I also think it depends on the size and diameter of the cage portion. Is there a formula for caluclating...
  21. So what your saying if I went and put in a system...

    So what your saying if I went and put in a system according to the "Bonnet Capacity" (i.e. 65600BTU Output system) it would be oversized. The people that have came into my house for estimates are...
  22. Why does my old 1975 Lennox G12D2 that I'm about to replace show a AFUE of 80%??????

    It'a a 1975 Lennox G12D2. It's really old and I'm getting it replaced. The unit shows an input BTU of 82K and an output BTU or named "bonnet capacity" of 65600. This makes not sense. I believe...
  23. If a home a/c system is missing 1 - 3 ounces of refridgerant is this noticable?

    I have a 1,200 sqft home. I have a Lennox system. I'm not sure of the ton but the furnace is 65K BTU and it's a r-22 system. It's not cooling that well that is the system is taking a very long...
  24. Not every homeowner fits that budget you just...

    Not every homeowner fits that budget you just stated. I don't pay for bottled water. I don't have cable TV. My company pays for my Cel phone. I don't drive a $30,000 car nor do I have a dog. I'm...
  25. No one started talking about human value until...

    No one started talking about human value until you. What make you think Iím an Engineer are you assuming. I never said I was I simply gave an instance if someone was one. In all fields the person...
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