AC Thermostat Bypass - Short Cycle |
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fwunder
Senior Member Joined: 04 Oct 2013 Location: New Jersey Online Status: Offline Posts: 1676 |
Topic: AC Thermostat Bypass - Short Cycle Posted: 20 Jul 2021 at 10:43am |
HVAC tech just left. Crawled all over taking measurements. Of course, the unit was running perfectly while he was here. Wiring all "looks" good. He measured compressor drawing 10 amps. He thought that might be a little hi. I think that's about spec.
His suggestions: Replace run capacitor Replace overload switch Double check all connections...again. He was not familiar with EasyStart, but as I said, I had issue before EasyStart. Down a bit of a rabbit hole, but I don't mind replacing a few cheap parts if it fixes it. The advice cost me $122.00 |
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2014 RPod 178 => MyMods and Buying Habits
2008 4Runner Limited 4.0-liter V6 Yes, those are wild ponies dining on grass while dumping tanks! |
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campman
Senior Member Joined: 26 Mar 2021 Location: La Salle, MB Online Status: Offline Posts: 209 |
Posted: 20 Jul 2021 at 9:20am |
Hello fwunder, thanks for documenting all the work you have been doing on this a/c cycling issue. I know I can't be the only one watching this thread (and pulling for you that you can isolate and solve the issue).
When you said you were talking to the easystart people I really perked up as I just installed my easystart yesterday and trained it as per instructions...just in case there was something up with the magic little box. I was wondering if you have a EPO hooked up in your electrical system and if that would help with your diagnosing/preventing the cycling when your heavier power load comes on? OG might have provided a temporary work around...Can't hurt in a pinch! ;-) Good luck with finding this obnoxious electrical gremlin. Andy |
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Andy and Laurie
'16 F150 5.0 4X4 w/factory tow pkg '21 RP192 "If the women don't find you handsome...at least let them find you handy!" Red-Green |
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offgrid
Senior Member Joined: 23 Jul 2018 Online Status: Offline Posts: 5290 |
Posted: 19 Jul 2021 at 12:36pm |
Just find the easiest part to take off and have the necessary tool handy. Then as soon as it starts acting up take the part off and put it right back. Problem solved!
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1994 Chinook Concourse
1995 RV6A Experimental Aircraft 2015 Rpod 179 - sold |
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fwunder
Senior Member Joined: 04 Oct 2013 Location: New Jersey Online Status: Offline Posts: 1676 |
Posted: 19 Jul 2021 at 11:52am |
Just to followup before HVAC tech arrives. I contacted local HVAC company. They reluctantly agreed to send a tech with no guarantee. I explained I just need someone to look at it and give me an opinion.
Anyway, short cycled on start this morning. One last check, I removed evaporator covering to inspect and check junction box wiring. All looks good. Of course, when I put it all back together AC is working great. LOL. Seems all I got to do is take something apart and put it back together, it works...for a little while. |
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2014 RPod 178 => MyMods and Buying Habits
2008 4Runner Limited 4.0-liter V6 Yes, those are wild ponies dining on grass while dumping tanks! |
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fwunder
Senior Member Joined: 04 Oct 2013 Location: New Jersey Online Status: Offline Posts: 1676 |
Posted: 18 Jul 2021 at 11:55am |
I did check line voltage earlier and it checked fine at the time - 118v @ RV plug onto garage. The only thing I changed was shore power cord and outlet and it came back on ( no short cycle ).
Soooooooo This AM I go out and fire it up. Ambient around 72. Set tstat @ 65. Short cycled from get go!! About 15 seconds of compressor time ( cooling ), shutdown and repeat. Today, with voltmeter @ pod 20 amp breaker (during short cycle) - 118 rest. 114 when fan kicks on. 110 when compressor kicks in. Compressor runs for 15 secs and then shuts down. I went on to different projects, came back and put old tstat back on. Checked continuity of three tstat wires back to control box. Also double checked all connections from EasyStart wiring before starting up again. Turned it on auto with temp set @ 68 - of course it's working perfectly again!! So it wasn't shore power cord or voltage. It's not heat (ambient) related. I do need to check voltage @ compressor next. I think I'm going to contact some local HVAC guys tomorrow and see if I can talk them into climbing a ladder to check it out. Hopefully, it will short cycle while they are here!! f
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2014 RPod 178 => MyMods and Buying Habits
2008 4Runner Limited 4.0-liter V6 Yes, those are wild ponies dining on grass while dumping tanks! |
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offgrid
Senior Member Joined: 23 Jul 2018 Online Status: Offline Posts: 5290 |
Posted: 18 Jul 2021 at 10:48am |
I thought you'd already checked the line voltage earlier? Where did you check it and was the a/c on when you did it? There can be a significant resistive drop between the home panel and the a/c so you need to measure at the a/c itself while it's running.
I don't know of anything other than low line voltage to the a/c compressor that would cause it to overheat that a bad cord or connector could cause without also tripping a breaker. I've overheated a connectorsll before running the a/c from a 15A circuit without tripping a breaker. The a/c takes so close to the breaker trip point that it's kinda a race between what will overheat first. That's why it's so much better to put in a 30A dedicated circuit for the trailer. |
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1994 Chinook Concourse
1995 RV6A Experimental Aircraft 2015 Rpod 179 - sold |
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fwunder
Senior Member Joined: 04 Oct 2013 Location: New Jersey Online Status: Offline Posts: 1676 |
Posted: 17 Jul 2021 at 4:10pm |
Ya know, I just thought...maybe it's the rPod shore power inlet? Could be changed cords wiggled something. Hmmm. Lot's to check out.
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2014 RPod 178 => MyMods and Buying Habits
2008 4Runner Limited 4.0-liter V6 Yes, those are wild ponies dining on grass while dumping tanks! |
|
fwunder
Senior Member Joined: 04 Oct 2013 Location: New Jersey Online Status: Offline Posts: 1676 |
Posted: 17 Jul 2021 at 4:09pm |
Electrical Demons!!
So storms passed, sun came out and started warming up again. About 4:00 PM I noticed on remote the interior humidity and temp rising. Humidity rising fast. Ruh Rho! Damn. Yep, it was short cycling. OK, so this time, just for grins I pulled out the 25 foot shore power cord I keep in the locker. I have a home set and a camping set so I don't have to keep packing and unpacking (poor man's pedestal). Anyway, I hook it up and plug into different garage circuit. You guessed it! When I tuned on AC, it got cold fast and has been working as expected for last hour. Wow, if that has been the problem it's really a big time gotcha! If it keeps working, I really want to figure out if it is cord, cord end(s), wall plug, etc. BTW, this little Govee WiFi temp/hygrometer is really handy. I see the inside temp is now 72.1 and humidity is 49 and dropping. f
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2014 RPod 178 => MyMods and Buying Habits
2008 4Runner Limited 4.0-liter V6 Yes, those are wild ponies dining on grass while dumping tanks! |
|
fwunder
Senior Member Joined: 04 Oct 2013 Location: New Jersey Online Status: Offline Posts: 1676 |
Posted: 17 Jul 2021 at 1:09pm |
Micro-Air still thinks it is a line voltage problem somewhere. Just happens to be heat related.
No more testing today cuz big storms rolling through. Gave us a nice 20 degree temp drop! Until then, AC was work fine all day. The EasyStart is supposed to catch compressor overload - D21 led on. Very frustrating problem. |
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2014 RPod 178 => MyMods and Buying Habits
2008 4Runner Limited 4.0-liter V6 Yes, those are wild ponies dining on grass while dumping tanks! |
|
offgrid
Senior Member Joined: 23 Jul 2018 Online Status: Offline Posts: 5290 |
Posted: 17 Jul 2021 at 8:54am |
Probably the switch will close again pretty quickly as it cools, it's just a little poppet sensor. If it's open when you get the short cycle then either it's bad or it's doing its job and your compressor is overheating. If it's bad then it's a cheap fix but if the compressor is overheating and the condenser coils are clean then you have $$$ issues.
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1994 Chinook Concourse
1995 RV6A Experimental Aircraft 2015 Rpod 179 - sold |
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