Reply
 
Thread Tools Display Modes
Old 08-21-2019, 10:39 AM   #1
Junior Member
 
Join Date: Nov 2016
Posts: 22
Rockwood Mini Lite AC issue

Hello! We have a Rockwood Mini Lite 2304 with a Coleman Mach AC. We're having a wickedly hot & humid spell in the NE - and we're suffering in our RV.
Here's the situation: on Low Cool, and the right knob turned halfway to the coolest setting, it begins to work - lowering the humidity a bit, then just blows cool air, with the humidity indoors steadily rising. If I turn the knob all the way to the coolest, immediately it starts taking the humidity down...for about 5 minutes; then, again, the humidity goes back up. The last couple of days the humidity outdoors is around 85% - inside 88%!
When we use High Cool, the same thing happens - but we get frozen out. The temp goes down to 67-68, with the humidity soaring inside. We're totally confused because it shouldn't be blowing cold, humid air - it should be DRYING the air as well. If seems that it should not be cooling the air either, but it is.
Any ideas? Is it freezing up? Thanks in advance for your advice!
__________________

mlleelise is offline   Reply With Quote
Old 08-21-2019, 10:48 AM   #2
Senior Member
 
Join Date: Jun 2012
Posts: 10,398
Sounds like it's freezing up. There's a freeze sensor somewhere on the evaporator. It may have shifted or fallen off. Also, keep the fan on high.

Low freon can also cause freezing. If that's the case, you'll probably need a new one, as these AC units are not built for recharging.
__________________

__________________
1988 Coleman Sequoia - popup (1987-2009) - outlasted 3 Dodge Grand Caravans!
2012 Roo19 - hybrid (2012-2015)

2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado 1500 Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10
rockfordroo is offline   Reply With Quote
Old 08-21-2019, 11:38 AM   #3
Junior Member
 
Join Date: Nov 2016
Posts: 22
When you say "Keep the fan on high," do you mean on "High Cool" or "High Fan"? High fan only is pushing in outside air, right?
It sounds like we should not run it on Low Cool until we find out if the sensor is bad or the freon is low.
mlleelise is offline   Reply With Quote
Old 08-21-2019, 03:47 PM   #4
Senior Member
 
Join Date: Jun 2012
Posts: 10,398
Quote:
Originally Posted by mlleelise View Post
When you say "Keep the fan on high," do you mean on "High Cool" or "High Fan"? High fan only is pushing in outside air, right?
It sounds like we should not run it on Low Cool until we find out if the sensor is bad or the freon is low.
Don't know your specific unit, but I highly doubt that either position brings in "outside air."

"High cool" is probably AC compressor providing cooling and circulating fan is on high speed. "High fan" is probably AC compressor NOT running, just the fan running on high to move air around.

I have a Coleman Mach, but it's ducted and runs off a thermostat, not from switches on the unit. In fact, I have pics of a 2304, circa Jan 2015, that has ducted AC, hence it's operated by a thermostat on the wall. So I"m not sure what you mean by "turning the knob."

My thermostat looked like this one, only black:


Name:   Analog Coleman-Mach.jpg
Views: 430
Size:  15.5 KB

Mine does not pull in any "outside air." I'm not aware of any AC unit that does that.
__________________
1988 Coleman Sequoia - popup (1987-2009) - outlasted 3 Dodge Grand Caravans!
2012 Roo19 - hybrid (2012-2015)

2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado 1500 Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10
rockfordroo is offline   Reply With Quote
Old 08-22-2019, 01:57 PM   #5
Senior Member
 
rlh1957's Avatar
 
Join Date: May 2017
Location: Southeast
Posts: 1,047
You do have your windows and roof vents closed I assume. If you have any condensation forming on roof vent or around window you can crack open a roof vent or window and see if that helps that.
Running the fan on high helps to circulate the air better and help the cooling efficiency. If you are getting a temp of 67-68 degrees with these units on hot and humid day, I say WOW.
The temperature coming down and then humidity climbing sounds like the compressor is shutting down or the air flow is becoming restricted because it is freezing up. Do you notice an air flow decrease then this is happening?
I am thinking this is low Freon or maybe other compressor issues. Might be as simple as the temperature probe coming off the evaporator coils.
Unscrew and totally remove the unit on your ceiling and look for a metal tube looking thing that attaches to the fins. You can even remove the cover during operation and maybe even see the freeze up. Does your unit have the ducted air or just the ceiling mounted unit?
__________________
2018 Forest River Rockwood Roo
24WS

2019 Ford SD F-350 SRW Lariat
Tow & Gooseneck Prep
FX4 Off Road (4X4)
rlh1957 is offline   Reply With Quote
Old 08-22-2019, 04:43 PM   #6
Junior Member
 
Join Date: Nov 2016
Posts: 22
It is a ceiling unit (see attached photo). No condensation on windows - Yes, it DOES cool it down beautifully, but everything inside is damp. The humidity makes everything feel wet.
Attached Thumbnails
Click image for larger version

Name:	20190821_102842.jpg
Views:	34
Size:	264.1 KB
ID:	213105  
mlleelise is offline   Reply With Quote
Old 08-22-2019, 04:54 PM   #7
Site Team
 
bikendan's Avatar
 
Join Date: Jan 2007
Location: Camano Island, Washington
Posts: 19,972
Quote:
Originally Posted by mlleelise View Post
It is a ceiling unit (see attached photo). No condensation on windows - Yes, it DOES cool it down beautifully, but everything inside is damp. The humidity makes everything feel wet.
Ahhh, the old Blast from the Center non-ducted a/c.
Quite the noisemaker.
__________________
Dan-Retired California Firefighter/EMT
Shawn-Musician/Entrepreneur/Wine Expert
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package
Equalizer WDH
bikendan is offline   Reply With Quote
Old 08-23-2019, 10:42 AM   #8
Senior Member
 
rlh1957's Avatar
 
Join Date: May 2017
Location: Southeast
Posts: 1,047
You have a wall thermostat and a through the ceiling non ducted unit that has knobs for control on it? Are you sure that wall thermostat is connected? Seems odd for a wall mount and a chassis mounted control.

It is possible to drop the temperature and humidity still not be down where you want it. I was in a resort hotel in Jamaica and had the room at 71 degrees but the humidity just wouldn't come down. Every thing felt damp, I had request all new towels whether I used them or not everyday because they were damp the next day. It was more like a water chiller system than Freon evaporative AC. Just making a comparison.

Maybe others have an idea. Usually in our campers the temp never comes down that far without some humidity reduction.
__________________
2018 Forest River Rockwood Roo
24WS

2019 Ford SD F-350 SRW Lariat
Tow & Gooseneck Prep
FX4 Off Road (4X4)
rlh1957 is offline   Reply With Quote
Old 08-23-2019, 10:50 AM   #9
Senior Member
 
cavie's Avatar
 
Join Date: Apr 2016
Location: Port Charlotte Fl/Hinsdale Ma
Posts: 4,443
I agree with post #8. This unit would not have a wall stat. I'll bet the wall stat is for the furnace. You running both at the same time? That would be my guess. A/C cooling to 67 degrees can not produce high humidity.

My house in Florida is set to cool to 84 while I'm gone for the summer. Humidity stays below 55%
__________________
2011 Keystone Sprinter 323BHS
Port Charlotte Fl/Hinsdale Ma
Retired Master Electrician.

I know you believe that you understand what you think I said but I'm sure you realize that what you heard is not what I meant
cavie is offline   Reply With Quote
Old 08-23-2019, 11:33 AM   #10
Senior Member
 
Join Date: Jun 2012
Posts: 10,398
Quote:
Originally Posted by rlh1957 View Post
You have a wall thermostat and a through the ceiling non ducted unit that has knobs for control on it? Are you sure that wall thermostat is connected? Seems odd for a wall mount and a chassis mounted control.

It is possible to drop the temperature and humidity still not be down where you want it. I was in a resort hotel in Jamaica and had the room at 71 degrees but the humidity just wouldn't come down. Every thing felt damp, I had request all new towels whether I used them or not everyday because they were damp the next day. It was more like a water chiller system than Freon evaporative AC. Just making a comparison.

Maybe others have an idea. Usually in our campers the temp never comes down that far without some humidity reduction.
OP never said he had wall mounted T-stat. I brought that up.
__________________
1988 Coleman Sequoia - popup (1987-2009) - outlasted 3 Dodge Grand Caravans!
2012 Roo19 - hybrid (2012-2015)

2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado 1500 Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10
rockfordroo is offline   Reply With Quote
Old 08-23-2019, 09:01 PM   #11
Junior Member
 
Join Date: Nov 2016
Posts: 22
There is no wall thermostat for the AC - only for the furnace, which is turned off. We would not be running the furnace AND the ac. We have an appt with the rv guy to come figure it out. Thanks for all the advice!
__________________

mlleelise is offline   Reply With Quote
Reply

Tags
lite, mini lite, rockwood, rockwood mini lite

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



» Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by Forest River, Inc. or any of its affiliates. This is an independent, unofficial site.



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 01:38 AM.


×