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  1. Replies
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    If you end up with 400 cfm per ton, and can...

    If you end up with 400 cfm per ton, and can balance the run-out's, there aren't any long term issues to consider.
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    You gonna' try to talk to the equipment...

    You gonna' try to talk to the equipment distributor first? They just might have a tech rep on the payroll...which is not to say, he would know any more than you, but could offer concurrence on the...
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    Sometimes, reading more than one post is...

    Sometimes, reading more than one post is necessary, for things to "make sense".
  4. Replies
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    That would seem to eliminate the "compressor not...

    That would seem to eliminate the "compressor not pumping" theory, and confirm the gas is just circulating through the RV, though I can't imagine how; unless the internals are all screwed up. You...
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    I had forgotten about that aspect of scroll...

    I had forgotten about that aspect of scroll design. Maybe they fell off the pallet somewhere between the factory and your guy's house.
  6. Replies
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    I was quite surprised with how well you...

    I was quite surprised with how well you maintained your composure throughout the interrogation. :grin2:
  7. Replies
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    I've been buying/installing residential...

    I've been buying/installing residential compressors and condensing units for 30 years and NEVER had one that wouldn't pump, out of the box.(including Goodman)

    The same goes for heat pump unit...
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    Human nature? Some renter mentalities go far...

    Human nature? Some renter mentalities go far beyond the boundaries of common sense. My most memorable "no cool" apartment experience was the guy who came to the door fully dressed, including a...
  9. Those numbers are not bad for 60˚ OD, and...

    Those numbers are not bad for 60˚ OD, and something around 70˚ ID. Go back to the 6 lb charge which will most likely fix the heat cycle symptoms. You can return in the spring to attempt a "fine tune"...
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    You didn't provide much data from which, one...

    You didn't provide much data from which, one could form an opinion...:grin2:

    However, depending on the OD/ID temps, the 92˚ discharge air sounds more normal than the 115˚ value the others are...
  11. They still make 'em, just not as available as...

    They still make 'em, just not as available as single pole variety. Try mobile home parts house if there's one close. Here's one at Ebay.

    Double Pole Limit
  12. Replies
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    The reason I added the items and info to your...

    The reason I added the items and info to your sketch was simply to confirm what you already know. If the transformer is generating the 24V nominal, the voltage measurement must exist between R and C....
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    On the most basic level, it's a "control" that...

    On the most basic level, it's a "control" that keeps the furnace and heat pump from running at the same time, to prevent the excessive head pressure that would result. When "W" energizes, the control...
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    As the schematic is drawn, with properly...

    As the schematic is drawn, with properly functioning components, "R" and "A" are at the same potential, "B" and "C" at the same potential. If the primary is energized, R to C = 24, R to A = 0, B to...
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    Pressures are generally measured in the supply...

    Pressures are generally measured in the supply and return (downstream of filters) trunks, reasonably close to the unit. Most residential equipment delivers the maximum rated airflow (400 cfm/ton) at...
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    Without cool and heat cycle numbers to analyze,...

    Without cool and heat cycle numbers to analyze, it's impossible to make a reply that doesn't offend your honor or insult your expertise. But, if the equipment ran as designed for 10 years, something...
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    The head pressure is high too. May be a simple...

    The head pressure is high too. May be a simple overcharge, if the OD coil is fixed metered. At 36˚ OD and an assumed ID of 70˚, suction should be around 40 psi and head around 200 psi.
  18. Replies
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    I'm not thinking too straight this...

    I'm not thinking too straight this morning...suction line wouldn't likely be frosting with 45˚+ SST, but the superheat is probably way low or nonexistent.

    When you detached the sensing bulb, the...
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    Suction line still frosting?

    Suction line still frosting?
  20. Replies
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    Believe my thinking is right here...the water...

    Believe my thinking is right here...the water coil is the evaporator. If the suction line is frosting, then the water flow is low, same symptoms as a Florida A/C with low evaporator air. Someone...
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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,...
  23. Replies
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    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...
  26. Replies
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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...
  29. Replies
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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...
  30. 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.
  31. 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...
  32. Replies
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    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.
  33. Replies
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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...
  34. Replies
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    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...
  35. Replies
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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...
  36. Replies
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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...
  37. Replies
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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...
  38. Replies
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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...
  39. Replies
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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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    Never mind...:oops:

    Never mind...:oops:
  41. 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....
  43. 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:
  44. 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...
  45. 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...
  46. 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...
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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.
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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".
  50. 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...
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