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11-29-2017, 08:39 PM
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#1
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Junior Member
Join Date: Sep 2017
Posts: 4
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3 AC unit question
I am getting ready to order a new Jayco NP fifth wheel. I am considering getting the third AC unit installed. I was told by a Jayco rep that only two compessors would run at a time but all three fans would run. They each have a separate thermostat. What would control this cycling of the front and rear AC unit? Can it be bypassed when needed? I know some will say three units are not needed but not really wanting to debate that in this thread. Thanks.
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11-29-2017, 08:48 PM
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#2
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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The 5th wheel must just have a 30 amp system otherwise it would run all 3 with a 50 amp system.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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11-29-2017, 08:54 PM
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#3
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Junior Member
Join Date: Sep 2017
Posts: 4
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Quote:
Originally Posted by Mr_D
The 5th wheel must just have a 30 amp system otherwise it would run all 3 with a 50 amp system.
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It is 50 amp. I realize there is enough current to run all three but for some reason their technology shuts one down. Wondering how they do this?
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11-29-2017, 09:01 PM
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#4
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Registered User
Join Date: Sep 2014
Location: Tucson
Posts: 1,419
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Don't believe everything you read. 30 amp will not run 2 a/c's without popping breakers. You need 50 amp to run two or three a/c's. There is a control unit that switches between the 3 a/c's compressors running only two at a time. It's pretty seemless. I run all 3 in my rig and it's hard to tell which 2 compressors are running while all 3 fans are running at the same time. If you plan on being in the desert southwest in the heat of summer then get all 3 a/c's.
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11-29-2017, 09:10 PM
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#5
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Senior Member
Join Date: Oct 2017
Posts: 326
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I have three a/c units in my TT. It came with two and I installed the third. Mine are not controlled by any device; they are all independent and can run all at the same time — which we do when camping in upper 90 degree weather (and higher).
My TT is 50 amp, and requires that service to run all three. However, I often run two when plugged into 30 amp service (when 50 is not available). You can’t run a whole lot else when running two a/c units on 30 amp, but it can be done. I do it all of the time.
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11-29-2017, 09:25 PM
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#6
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Senior Member
Join Date: Jul 2017
Posts: 434
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Mine has 3 a/c and each has its own temp settings and sensors in coach. Will display set temp and actual temp in each zone
__________________
Mike & Kelly
2017 Discovery 40E Freightliner Cummins 380hp
2017 Jeep Wrangler Unlimited
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11-30-2017, 07:28 AM
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#7
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Senior Member
Holiday Rambler Owners Club
Join Date: Oct 2012
Location: Tampa FL
Posts: 679
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Yes we can run all 3 on 50A but...
We only have one thermostat/controller and several zone sensors. The controller will prevent multiple compressors from "starting" at the same time. They can run at the same time but the initial starting is a significant surge of electricity.
Also depends on if you have (3) 1250s or (3) 1500s or some combination of.
__________________
2006 HR Scepter 42DSQ
Holiday FL
RVIA Certified RV Service Technician
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11-30-2017, 01:36 PM
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#8
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Senior Member/RVM #90
Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 54,626
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Hi ! Welcome to IRV2! We're sure glad you joined the gang!
Never had a rig with 3 A/C's so can't help with the question! Keep her between the ditches!
Good luck, happy trails, and God bless!
__________________
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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11-30-2017, 03:42 PM
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#9
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Senior Member
Monaco Owners Club
Join Date: Jun 2011
Location: CA
Posts: 4,457
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Quote:
Originally Posted by Scidlik
I am getting ready to order a new Jayco NP fifth wheel. I am considering getting the third AC unit installed. I was told by a Jayco rep that only two compessors would run at a time but all three fans would run. They each have a separate thermostat. What would control this cycling of the front and rear AC unit? Can it be bypassed when needed? I know some will say three units are not needed but not really wanting to debate that in this thread. Thanks.
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To answer your question, a EMS (energy management system) would monitor and shed electrical loads in order to not overload the system. The fans themselves use very little power, that's why he said all 3 of those can run simultaneously. It's the compressors that take the power. And for sure you can't have 2 compressors starting at the same time, especially on 30 amps. There is a big surge when compressor starts up.
But with 50 amps power I would think you could run all 3 at the same time. You actually have 2 legs of 50 amps each. I'd ask the dealer to elaborate on why you can't run 3. Maybe it's a Jayco thing.
I'd definitely get the 3rd unit. You'll never say "I wished I only got 2 A/C's".
__________________
Bill & Brigitte
06 Windsor PEQ, Cummins 400 ISL
2014 Honda CRV or 2012 Jeep
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