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  1. Thread: Air Filter

    by twcpipes
    Replies
    7
    Views
    1,061

    ksspartan

    Could that not create a problem if a blower was rated for .5" and all you had left for the whole system was
    .27" without adding an additional static drop for a partial dirty filter in the cooling...
  2. Replies
    13
    Views
    1,195

    trane

    Thank you so much. Yoiu are right, It could make a huge difference.
    tom
  3. Thread: Air Filter

    by twcpipes
    Replies
    7
    Views
    1,061

    ksspartan

    What is the published static pressure drop for this new filter?
  4. Replies
    13
    Views
    1,195

    trane

    Can you expand on your statment re: duct changes.
    than you, tom
  5. Replies
    13
    Views
    1,195

    To All re: new downflow

    Thank you for your replies. I will check Johnstone. The vent is solid from the combustion chamber through the roof. I should think that is why the fresh air can be a part of the open return air...
  6. Replies
    13
    Views
    1,195

    Hi folks. I do primaririly commercial/industrial...

    Hi folks. I do primaririly commercial/industrial but:
    My personal downflow furnace )mobile home) needs replacing. Have a Coleman/Intertherm downflow with 3-ton coil. Unit existing is a model...
  7. Replies
    18
    Views
    2,055

    Samp

    It is not my place to try to redirect your decisions on a new move but I will offer some facts you may or may not have thought about:

    In moving to commercial in-house, how do you intend to learn...
  8. Replies
    11
    Views
    2,143

    jaybee

    I'll try to make this short and remembering that on the hottest days of the year you will need a minimum of subcooling and superheat for the unit to have some net refrigerantion effect and still cool...
  9. Replies
    21
    Views
    1,606

    AND please

    When you take a FULL set of readings Monday, can you please get the compressor discharge superheat. How long ago was the compressor changed out so we know if the original charge of oil is logged in...
  10. Thread: changing CFM

    by twcpipes
    Replies
    20
    Views
    1,698

    fan rotation

    My next question was the same. The amps seem low for 115 volts but stranger things have happened.
  11. Replies
    41
    Views
    3,529

    drrtu

    Very nice duct job!
    I have a quick additional question if I may:

    I looked at your hand drawn pic, #4 I believe, and it shows a return air fan discharge static of .5" and an outside air static of...
  12. incontrol

    Can you make up a ice water mix and check all the sensors?
    As well as your thermometer?
  13. Replies
    11
    Views
    1,989

    bbdd1

    Do you by chance have a 2-1/2 to 3 ton indoor unit?
    Please post model numbers.
    thank you.
  14. Thread: changing CFM

    by twcpipes
    Replies
    20
    Views
    1,698

    in house worker

    One last thought to maybe help:

    Since you are comparing units can you not:

    1. Make sure the motors are the same RPM and amp draw.
    2. Measure the static across the blower on both the low unit...
  15. Thread: "A" coil size

    by twcpipes
    Replies
    20
    Views
    1,754

    deejoe

    >>Read the previous posts in full and you will know the whole story.
    Thanks anyways.<<

    Before signing off this thread I have to ask:

    1.What makes you think you can just arbitrarily run up...
  16. Thread: "A" coil size

    by twcpipes
    Replies
    20
    Views
    1,754

    deejoe

    Do you feel you will have sufficient cooling air coverage using 600cfm for 1400sq.ft.? This is open to all.
  17. Thread: changing CFM

    by twcpipes
    Replies
    20
    Views
    1,698

    in house worker

    What voltage and phase is the motor?
  18. Last post:

    intended as wit.
  19. Replies
    37
    Views
    3,244

    jayhawker

    As one last qustion:
    Would they allow you to decrease boiler water temperatures gradually to see if you can reach a tighter balance with the a/c as well as the system?
    thanx, tom
  20. Replies
    41
    Views
    3,529

    drrtu

    First off let me thank you for staying with us on this very important post you brought. It is one that you don't see often but brings a lot of information with it to the table for many people who can...
  21. This is...........

    Exactly why we have water treatment reps who come out and do this.
  22. Replies
    6
    Views
    1,193

    Could it have been........

    just dry wit??
  23. Replies
    37
    Views
    3,244

    OOPS!

    This project needs to go back to the mechanical engineer for much tighter operation parameters. He/she needs to research their load calcs and see just how much reheat this a/c needs to just get by....
  24. Replies
    41
    Views
    3,529

    drrtu

    Can you please take the time to clarify five items for better understanding please:

    1. The 36,000 CFM figure. Is that the total cooling if ALL the boxes were open or is it, say, 80% allowing for a...
  25. Replies
    16
    Views
    2,163

    As a last resort?

    When you establish the condenser coil is clean and the head is still high, it may be due to condenser oil logging. If the oil charge from the first compressor was left in the system, you may have it...
  26. Thread: New boiler

    by twcpipes
    Replies
    8
    Views
    1,954

    davidfromtoronto

    Can you very quickly post what each says they are "furnishing". Also, what they are omitting.
  27. Replies
    19
    Views
    1,984

    frankthetank

    Just to add a couple of things although they have been cussed and discussed here:

    Your head is too high. 335 @ 82. You need to get the head down. I "assume" you have a matched system indoor to...
  28. Replies
    7
    Views
    1,027

    jeep6275

    Some thoughts re: your project.
    First off you really don't know where your at with this thing. The first thought that comes to mind is if you didn't blow out the indoor coil and lines, you don't...
  29. R12rules

    Yes I will attempt to explain.
    The job as explained has a 5 ton compressor/condenser motor load on a three ton electrical service and has run that way at least one season of a/c given it is not a...
  30. Replies
    7
    Views
    1,798

    ace12

    You don't mention the amount of air over the evaporator or the return entering temp for the 60# suction. But, no matter, since the six ton compressor may just have a five ton expansion device that...
  31. Replies
    11
    Views
    1,492

    joseph navarro

    AND!!!
    as a side note:

    Take the time to open up the expansion valve bulbs and make sure they are clean as well as the pipes to which they are attached. Put them back tight and insulate them with...
  32. lonboy

    I came up thru the original Western Air & Refrigeration in the Start-up Dept. back in the 60s/70s. We did a lot of chillers both in new construction and service department and many were changeouts....
  33. didn't realize

    Our Industry has gotten to the point this issue would even be discussed. An undersized electrical supply that has been used and is no longer worth the three-ton it was intended. Now some want to...
  34. Replies
    67
    Views
    6,900

    rufus

    Where are you located in the country? What has the realative humidity been lately?
  35. Replies
    7
    Views
    809

    ralfy

    Straight cooling or heat pump?
  36. Replies
    9
    Views
    1,443

    You never had this problem until you changed the...

    You never had this problem until you changed the oil? And the water temps are also the same they always have been?
  37. Replies
    27
    Views
    7,032

    RoBo

    Just a hi from the pipes. Long time no talk to you. Hope all goes well. Read your bio. You've been busy.
    Am looking at putting a new goodman downflow in my mom's mobile home here shortly. Need to...
  38. Replies
    20
    Views
    1,635

    AW

    If you want ot look at this situation from a purely business stand point then the question is "why not?"
    It is really a very good deal if approached properly.

    First you would normally take your...
  39. Replies
    15
    Views
    1,432

    Have a need to install new downflow equipment in...

    Have a need to install new downflow equipment in a mobile home. It presently has a downflow three-ton gas furnace, matching coil with three-ton condensing unit. All Coleman.
    Anybody know of any...
  40. Replies
    18
    Views
    1,525

    comfortable air

    What is the relative humidity where you are and what was it when you took your readings?
  41. Replies
    18
    Views
    1,525

    comfortable air

    All ten other units are doing 10 degrees?
  42. Replies
    16
    Views
    2,006

    John

    Wouldn't you like to have a dollar for everyone like that that has happened in the last 30-40 years.
  43. Replies
    20
    Views
    1,954

    dv8

    There is a lot to do before you can say restriction or not.
    airflow: get the rpm, static total (find out from Trane where to take the actual readings) and the actual and nameplate amps for a...
  44. Replies
    21
    Views
    1,458

    orland25

    Drop a dime to the manufacturer. A good time to get involved with them. Figure about how much air will be your minimum, get the square feet and call them. Be sure to get their data on pressure drop...
  45. Replies
    14
    Views
    2,231

    addison

    low side 25PSI
    high side 220PSI
    evap, disharge temp, 79
    suction line temp at the comp, 86
    comp,discharge temp. 295
    condenser discharge temp, 95
    temp,about 4 inches from TXV 98 ...
  46. Replies
    4
    Views
    781

    hvacdoctor

    If your client wants a second year then he should have to pay something toward that. The compressor can usually have an additional 4 year warranty extended from the factory but the remaining parts...
  47. Replies
    15
    Views
    2,654

    Favor

    When you change out the consing unit can you cut out the coil and turn it upside down and see how much oil comes out?
    Thanx.
  48. Replies
    1,275
    Views
    125,886

    Well,

    We probably will never know how this new super-duper system does when the weekends come, it's hot and muggy, and the building system is off. That 5 ton cooling coil would have been a nice touch with...
  49. Replies
    150
    Views
    50,119

    But Wait one more time

    I have to go back to my original system of a
    Fixed orifice.
    Now I will add a system:
    5 ton compressor/condensing unit. 5 ton evaporator coil.
    3-1/2 ton load on said evaporator. Air flow at...
  50. Replies
    7
    Views
    1,143

    Just remember

    to use the small nitrogen drum. It is bad enough to have to carry a compressor up to a roof ( and one down) much less a big drum of nitrogen. This industry tries very hard to get your back so make...
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