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  1. Replies
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    Steve-roofwalke nailed it, assuming the "best"...

    Steve-roofwalke nailed it, assuming the "best" are the guys who can effectively run service calls day in, day out. And some of those probably can't tell you "what superheat measures". But they know...
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    "A/C Renew" Maybe Not A Lost Cause

    I didn't want to hijack the other "Renew" thread, but for what it's worth...

    Had a guy call me with an old heat pump condenser, reversing valve sticking in "cool". You could mess with it a while,...
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    1,404

    What little I know about ECM technology is what...

    What little I know about ECM technology is what I've read. But, if torque is the control parameter, I would think the motor will adjust to the mass of air being moved. If the velocity and cross...
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    That's true for a motor running at constant...

    That's true for a motor running at constant speed.



    The question was relative to the motor ramping up .

    If the duct is 100% blocked, the blower would "huff". The blower speed oscillates, due...
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    Half dozen motors, slew of run caps, universal...

    Half dozen motors, slew of run caps, universal hard start, thermostats (heat pump, heat-cool), contactors, assorted relays, transformers, hot surface ignitors, thermocouples, defrost termination...
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    I've seen a couple of flaky utility meters. Old...

    I've seen a couple of flaky utility meters. Old units that had been in service for many years. Also suspected low supply pressure a few times. Seems a few utilities have reduced standard supply...
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    Within the static limits of the blower wheel,...

    Within the static limits of the blower wheel, both SP and wattage increase as the motor speeds up, per the "fan laws".

    The SP increases due to an increased volume of air being pushed through the...
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    Don't forget the fan laws. PSC motors speed up...

    Don't forget the fan laws. PSC motors speed up with increased static due to less load and the "slip" thing.

    ECM's don't control static pressure. The motors "see" an increase in SP as reduced...
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    Firstly, I'm impressed "Dependable" made an...

    Firstly, I'm impressed "Dependable" made an accurate diagnosis, without having to consult a forum beforehand, for suggestions as to what might be the problem. Secondly, I was impressed with his...
  10. Was the indoor coil was also frosted up? If so,...

    Was the indoor coil was also frosted up? If so, the suction pressure value was reflecting low airflow, and not very helpful in determining what caused the frosting to begin with.
  11. Replies
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    If you were reading 400/115 pressures on 22, I...

    If you were reading 400/115 pressures on 22, I would think the compressor's probably by-passing. For the ID/OD temps, normal pressures would be closer to 300/70. High head most always due to too...
  12. Replies
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    1,498

    The 113˚ reading could be the result of the strip...

    The 113˚ reading could be the result of the strip heat being energized. You need to monitor the system pressures while all the above is going on, to know what the heat pump is doing.
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    Most of the old Goodman's with the sequencer...

    Most of the old Goodman's with the sequencer looking control were wired on "high". They run the same speed in cool, heat or emergency/auxiliary heat. Find the motor speed leads (red & black), see...
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    1,405

    Refrigeration equipment is designed to operate...

    Refrigeration equipment is designed to operate with certain saturated refrigerant temperatures inside the coils, but we measure the pressures to determine the temperatures. The necessary coil...
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    You were a little late bringing that info into...

    You were a little late bringing that info into the discussion. 55 psi could be "normal" for 60˚ OD and 70˚ ID, with a fixed orifice coil. "Normal" air volume is 40050 cfm per ton. So, if it's...
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    The fact the superheat values stay somewhere in...

    The fact the superheat values stay somewhere in the mid teen's and additional freon doesn't raise the suction pressure, would suggest the coil has an expansion valve. Were you checking the head...
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    And, the liquid line is 65˚. :confused: That...

    And, the liquid line is 65˚. :confused: That sounds like reversed temperature sensors on a digital gauge set. If you swap the numbers around, you get approx 17˚ superheat and 35˚ subcooling.
    If...
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    Hmmm. :confused: Well, some of the other guys...

    Hmmm. :confused:

    Well, some of the other guys think the piston is undersized for 4 tons. Any possibility the coil is smaller tonnage than the condenser (mismatch) ?

    And no restrictions inside...
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    The P-T chart I'm looking at shows an SST closer...

    The P-T chart I'm looking at shows an SST closer to 36˚.

    The IDWB would have to be 62˚ for a target SH of 13˚. Just guessing the WB isn't that low, the numbers indicate an airflow problem...in...
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    773

    Never mind...:oops:

    Never mind...:oops:
  21. Replies
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    It's the, "I think it's working a little"...

    It's the, "I think it's working a little" syndrome...I owned cooling equipment before I knew what it did, and was just as bad as the ones we criticize. They don't understand how it works, so they...
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    Excellent point. :yes: Lack of sufficient...

    Excellent point. :yes:

    Lack of sufficient compressor protection is IMO a big factor in compressor failures. Todays compressors (again IMO) can't endure the abuse those of thirty years ago would....
  23. I just looked at average winter low temps for...

    I just looked at average winter low temps for your area...+40˚. You could probably rewire the defrost control to cycle off the compressor instead of the fan, and let it "air" defrost. :grin2:
  24. Just about every mfg but Rheem. I ran across an...

    Just about every mfg but Rheem. I ran across an internet-purchased brand (I'd never heard of) recently that energized in heat, but don't know of any other resi equipment brands with the atypical...
  25. Best way to accomplish that is convert the...

    Best way to accomplish that is convert the defrost control to a "demand" type. Not sure Goodman has something you could just swap out with. The higher SEER units may come with demand controls that...
  26. Replies
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    Low suction and low/non-existent superheat is...

    Low suction and low/non-existent superheat is airflow related. Not enough heat available to boil off the refrigerant. If it's intermittent, I'd guess a funky blower motor control. That or something...
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    Can't tell for sure, from all your posted info,...

    Can't tell for sure, from all your posted info, but a low to normal superheat, with the 50 psi suction pressure, is symptomatic of low airflow, and would suggest the TXV is attempting to do it's...
  28. Replies
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    Why 1940 cfm for a 3 ton condenser? and how?...

    Why 1940 cfm for a 3 ton condenser? and how? :confused:

    I'm thinking erratic airflow rather than TXV problems.
  29. Replies
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    Go here.. http://www.achrnews.com/# ...and do a...

    Go here.. http://www.achrnews.com/# ...and do a search for "low airflow".
  30. Replies
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    The "normal" suction pressure for the ID/OD temps...

    The "normal" suction pressure for the ID/OD temps would probably be around 80 psi. You're at 60 (35˚ saturated)...once the sun goes down and the temps drop, so will the suction pressure. It's...
  31. Replies
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    If the motor is running, there must be some...

    If the motor is running, there must be some voltage, on one of the motor leads, coming from some where, whether or not there's a "call" for fan.

    Use a clamp-amp meter to determine which lead(s) is...
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    I always forget about that little detail. :oops:

    I always forget about that little detail. :oops:
  33. Replies
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    The tube you're referring to is the equalizer...

    The tube you're referring to is the equalizer line for the TXV, providing the necessary evaporator pressure to the valve, for it to work as designed. Since the system does well in cool cycle, there...
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    Thanks for the correction.

    Thanks for the correction.
  35. Replies
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    Once the MIC motors came into play, I found...

    Once the MIC motors came into play, I found sleeve bearings to be the weak link, and began buying ball bearing motors.

    Half, and some, third horse universals are oftentimes too long for replacing...
  36. Thread: Goodman

    by Saturatedpsi
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    533

    Those older Goodman "sequencer" type blower...

    Those older Goodman "sequencer" type blower controls are notorious for intermittent failures to "close" on a stat call. Quite likely the cause of the occasional freeze ups.
  37. Replies
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    Bard also makes them...if you should need an...

    Bard also makes them...if you should need an option.

    http://www.bardhvac.com/digcat/S3364_TechDoc_CD/TechDoc-PDF/2100-468.pdf
  38. Replies
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    Compressor manufacturers tend to specify...

    Compressor manufacturers tend to specify "compressor" superheat values, while equipment manufacturers usually specify "service valve" superheat values. And there's usually not a big difference...
  39. Replies
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    A problem with the TXV or RV won't generate those...

    A problem with the TXV or RV won't generate those pressures, with a "normal" refrigerant charge. Recover refrigerant until the system will run without tripping HP limit, then try to do some analysis.
  40. The condensing temp is about equal to ambient....

    The condensing temp is about equal to ambient. Normal charge with a TXV issue would have higher head pressure than what you measured.

    10 year old unit, probably has a leaking coil. Add more freon...
  41. Replies
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    It's quite possible, the new filter/dryer was...

    It's quite possible, the new filter/dryer was included to remind you to remove and replace the OEM/existing dryer.
  42. Replies
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    Mufflers are always (all I ever saw) in the hot...

    Mufflers are always (all I ever saw) in the hot gas line at the compressor.

    The pressures, cool liquid/suction lines and "frosting" points suggest a liquid restriction and too much charge. Of...
  43. Thread: heat pump

    by Saturatedpsi
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    932

    The thing is, I wasn't trying to be a...

    The thing is, I wasn't trying to be a smarta$$...if the pressure goes high and the compressor starts by-passing, what's to diagnose? I just assumed he wasn't watching (or measuring) the pressure on...
  44. Thread: heat pump

    by Saturatedpsi
    Replies
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    932

    If you measure the head pressure, the answer to...

    If you measure the head pressure, the answer to your question will likely be obvious.
  45. Replies
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    OD + 50˚ SCT isn't normal for anything...

    OD + 50˚ SCT isn't normal for anything residential to my knowledge. OD + 20˚ is about normal for 13 SEER stuff.
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    Just out of curiosity, what were the codes?

    Just out of curiosity, what were the codes?
  47. Replies
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    Where does "beginner" status begin and DIY status...

    Where does "beginner" status begin and DIY status end?
  48. Replies
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    68=40˚... Condensor Low Side temp=46˚......

    68=40˚... Condensor Low Side temp=46˚... Superheat=6˚

    230=110˚... High Side temp = 105˚... Subcooling=5˚



    I'd take those numbers any day on MH equipment. :grin2:
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    Yes, but it will also reduce the superheat, which...

    Yes, but it will also reduce the superheat, which you don't need.

    Been already said it: the airflow is low for some reason.
  50. From "Wikipedia": "For a given parcel of air...

    From "Wikipedia":

    "For a given parcel of air at a known pressure and dry bulb temperature, the thermodynamic wet-bulb temperature corresponds to unique values of relative humidity, dew point...
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