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06-30-2012, 06:28 AM
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#1
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New Member
Join Date: Apr 2012
Location: Montrose
Posts: 3
M.O.C. #12375
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A /C start delay
I have an 2007 3400 rl. Last few times I have started the ac there has been about a 30 to 45 second delay from turning on at the thermostat till the unit turns on. And advice would be great as we are total newbies to rvs.
Thanks in advance
Peter
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06-30-2012, 07:50 AM
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#2
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Montana Master
Join Date: Jun 2004
Location: Benson
Posts: 3,121
M.O.C. #1658
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That's not unusual, Ozz will know the reason for it
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06-30-2012, 03:03 PM
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#3
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Montana Master
Join Date: Oct 2007
Location: Land O Lakes
Posts: 2,751
M.O.C. #7753
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ours usually takes several minutes
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06-30-2012, 03:21 PM
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#4
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Montana Master
Join Date: May 2011
Location: Fayetteville
Posts: 4,200
M.O.C. #11401
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Ours is slow on startup also.
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06-30-2012, 03:59 PM
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#5
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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It should take close to two minutes. The delay is built in so if you have a brief power interruption or turn the AC off and right back on it doesn't start right away. If it did start right away in a situation like that the compressor would be damaged by having to work against the pressure. By waiting a few minutes the compressor can start again without issues. You will find an EMS will do the same thing. Ours waits 180 seconds from the time power comes back on until it sends power to the unit to make sure no damage is done to the AC.
__________________
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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06-30-2012, 04:00 PM
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#6
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Montana Master
Join Date: Apr 2007
Location: South Shore
Posts: 6,009
M.O.C. #7110
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Ours takes a few minutes also. Just when I start to be very concerned, it kicks on.
__________________
2011 GMC 4X4 dually CC, 6.6 Duramax with Allison Transmission. Formally 2001 Montana,2007 3400RL Montana, presently 2018 3401RS Alpine.
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06-30-2012, 04:17 PM
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#7
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New Member
Join Date: Apr 2012
Location: Montrose
Posts: 3
M.O.C. #12375
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Okay thanks all I will learn this stuff.
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06-30-2012, 04:41 PM
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#8
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Montana Master
Join Date: Jul 2006
Location: K.C.
Posts: 11,731
M.O.C. #5980
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Quote:
quote:Originally posted by DQDick
It should take close to two minutes. The delay is built in so if you have a brief power interruption or turn the AC off and right back on it doesn't start right away. If it did start right away in a situation like that the compressor would be damaged by having to work against the pressure. By waiting a few minutes the compressor can start again without issues. You will find an EMS will do the same thing. Ours waits 180 seconds from the time power comes back on until it sends power to the unit to make sure no damage is done to the AC.
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What Dick said..
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07-01-2012, 02:34 PM
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#9
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Montana Fan
Join Date: Oct 2006
Location: East Moriches
Posts: 418
M.O.C. #6436
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Actually the compressor will not be damaged. The delay is to let the pressure on the high and low side equalize. If it started up right away the breaker would probably trip.
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07-01-2012, 03:04 PM
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#10
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Montana Master
Join Date: Jul 2006
Location: K.C.
Posts: 11,731
M.O.C. #5980
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The electric motor in the compressor could be damaged with repeated faults, bottom line it is not a healthy environment for the compressor, but yes, the breaker would trip.
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07-08-2012, 02:54 PM
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#11
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Montana Master
Join Date: Nov 2004
Location: Oak Harbor
Posts: 1,530
M.O.C. #2471
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Ours takes about 2-3 minutes for each from when we tell the thermostat to "GO".
Jack
__________________
Previous:2004 Mountaineer 325FKBS,2010 Montana 3455SA Now:2018 Bighorn 3575EL (SOB's  ) Res. Fridge,W/D,Disc Brakes,Water Softener,Dish Tailgater PRO,LioN Batts, several mods.
2021 RAM 3500 Laramie.... "LOADED", 4x4, SB H.O. 6.7L, Aisin Trans, PullRite Super Glide Hitch, 52 Gallon Titan Fuel Tank.
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07-08-2012, 03:06 PM
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#12
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Montana Master
Join Date: Jul 2006
Location: K.C.
Posts: 11,731
M.O.C. #5980
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Quote:
quote:Originally posted by jackel1959
Ours takes about 2-3 minutes for each from when we tell the thermostat to "GO".
Jack
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Yes, that is a built-in time delay to insure the pressures equalize in the system. With the old mechanical thermostats, people would often bump them, or allow the contacts to be made, then broken, which would blow the breaker, or make the internal 'Klixon', or bi-metal overload to repeatedly try and start. Not good for the system.
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Linear Mode
