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  1. A 3 ton evaporator would require 1200 cfm and a...

    A 3 ton evaporator would require 1200 cfm and a 2.5 ton condenser would require 1000 cfms. So if a 2.5 ton condenser is matched with a 3 ton evaporator, are ther opinions for what the ideal blower...
  2. match cfm to evaporator or condenser tonnage

    If a system has an evaporator which is a half ton larger than the condenser, should the blower speed ideally match the tonnage of the evaporator or the condenser?
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    Thanks for all of the responses. I got a hand me...

    Thanks for all of the responses. I got a hand me down meter for millivolts. I have a fieldpiece (sc66 maybe) that goes down to 24 volts. If it tests millivolts, I cant figure out how to do it. It...
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    1,304

    testing millivolts

    I have a good multimeter that I rely on for work. It does not test millivolts though, something I need to be able to do. I havent found a meter that advertises the ability to test millivolts. Does...
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    246

    beneficial workshops

    I just attended the heat exchanger experts workshop and was very satisfied. I am still at less than two years in the field and hope to continue to learn. Does anyone have suggestions for workshops?...
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    2
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    364

    pro membership, number of posts

    I am interested in applying for pro membership, but cant figure out how many posts I have made so far. I believe I am over a dozen. I dont know if I am at fifteen yet. I have been doing hvac for a...
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    5
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    351

    changing thermostat batteries

    Another technician told me he has gone on numerous callbacks where the tstat batteries were weak - 1.1 out of 1.5 volts causing intermittent problems with the stat. Does anybody have recommendations...
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    3
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    370

    question about variable speed motor

    I am interested in learning how variable speed motors are controlled in an hvac system. Can anyone suggest a good article on the subject, or share an explanation? Thanks!
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    16
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    1,358

    hvac problem solving skills

    I believe that experience is one of the best teachers, but I havent been working much and want to learn as much as possible while work is slow. Are there any suggestions for continuing education? ...
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    1,642

    a reliable psychrometer

    Does anybody have any suggestions for a reliable psychrometer? I have been in the field for a short time and need a reliable psychrometer for wet bulb readings. I have one from supco which my or...
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    592

    evaporator coil cleaning

    Does anybody have general guidelines as to when it would be appropriate to clean an evaporator coil? Would a pressure test before and after the coil with a manometer be the best way to determine if...
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    819

    condenser coil cleaning

    It is pretty clear that accumulated dirt/debris which can and will plug a condenser causing a reduction in airflow. It is important to have the dirt/debris removed as maintenance. I believe that...
  13. why did the flame rod replace the thermocouple?

    I believe that preventative maintenance for a flame rod involves cleaning it so anything on the surface does not insulate it causing a low microamp signal which would cut off power to the burners and...
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    This is the Ask Our Pro's forum, and only Pro...

    This is the Ask Our Pro's forum, and only Pro members that have been vetted by the AOPC may post advise here. Please apply to the AOPC today, thank you.

    You can find the rules for posting and...
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    317

    aprilaire humidifier control

    The control keeps flashing the change panel code. It has a new pad, water to the solenoid, and the solenoid opens with 24 volts applied to it. I was told to reset the control to set it to...
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    989

    inspection camera

    Does anyone have advice for purchasing a camera?
  17. Duct cleaning for a slab foundation house

    any thoughts?
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    505

    measuring temperature

    What is the quickest and most accurate instrument for measuring td on a line set ?
    What is the quickest and most accurate instrument for measuring td in ductwork?
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    445

    one cold room

    The cold room is farthest from the furnace. All ductwork is in a crawl space which is not insulated but not cold. The cold room shares a return with the adjoining room. There is a 3/4 inch gap...
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