I have the Coleman Mach 8 in my wolf creek. This weekend is the first I have played with the AC.The AC definitely works for the small space, I can cool temps from 100 down to the lower 70's in an hour or so. Humidity drops right along with temps. This Coleman has the controls on the unit.Once the compressor shuts off the fan continues to run inside, the humidity will rise fast. I mean from 50% to 90% in 10 minutes.As soon as the compressor comes back on the humidity lowers again.High or low fan has the same problem.I feel that as the fan blows over the coil it must be evaporating any moisture remaining on the cooling coil which raises the humidify inside the camper.Everything is new, purchased this spring. I pulled AC cover and coil cover, yes the water is running out through the foam that they put in the tray. (and it has the REV B fan for those of you following the cracked fan thread)Is this just how these units with the overhead controls work?I am ready to install a 20amp relay that is controlled by a low voltage circuit and a wall thermostat that will turn Electric off to the AC instead of leaving the fan running when not calling for heat. NOTE: Thermostat will have 5 min delay so it can't turn AC back on until delay expires. than you control the fan speed on the overhead unit. I did this to my last truck camper but it was because the temp swing using the AC overhead controls was driving me crazy.

Now that you mention it I think I am experiencing the same thing. I guess I need to check mine as I don't think I've even seen any water come off the roof. I rarely use the a/c so I haven't got around to it... also hate heights :(

what size, whats the BTU rating on your unit?

I am dumber than a boot when it comes to A/C. If it is of any value to you, I have the Polar Cub 9200 btu. It definitely has water coming off the roof.Wayne

You WANT that water to run off the roof away from your AC. If it's running water off with high humidity outside it's working. If the drain becomes clogged water will back up into the camper thru the unit itself. If is humid outside and no water is running inside or outside then the unit is freezing up. It's not running fast enough to stay thawed. Run on high fan for a while to circulate enough warm air to thaw it out then set it on high cool. My AC tech told me a long time ago when we had this problem in a 5er to always run the AC on high in high humidity, just turn the cold control to warmer if it's too cold in the camper. Only run on low fan when the humidity outside is low. Since I've followed that rule we've had no further problems in any camper we've owned. I always check the drain for bug obstructions frequently if there's no water running and after each long term storage time. Keeping the filters really clean on your inside part of the unit makes a difference as well. At least that's our experience with 13,500s and now the 9200s and 16 years with camper ACs.

I have the same problem humidity goes up and down with the cycle of the compressor. The moisture is evaporating back in the air. Only fix is to cycle the fan on and off with the compressor. I have plans to set it up to do it but just haven't done it yet.

AC and humidity problems. | Good Sam Community

towpro
Explorer
Aug 09, 2015
hard start device showed up, installed it and now the AC makes even more noise starting, and Honda still starts it on eco but it struggles more now.

But there is no schematics around that I can find that shows if this already has a hard start device. There is 2 CAPs in the electrical box for the compressor, and some kind of relay down in there. I wired it like it says "one wire to each side of startup CAP.

Going back up top now to remove hard start device.

Edit: Hard Start removed, it AC now starts much easier :(

Edit 2: Found schematics under the lid I took off 3 or 4 times :(.
Unit already has a hard start cap, but the one I bought has 2X the capacitance, so I figured lets replace the factory one with aftermarket one.

Results: Much worse groan from AC as it starts, so I put stock stuff back in and decided "leave it stock".
dave17352
Explorer
Aug 07, 2015
As it gets hotter and hotter during the afternoon I wonder if it will still start on ECO mode. My honda eu3000 works fine on our 15k ac until it really gets hot the I have to put it on full throttle or overload kicks out the power.
towpro
Explorer
Aug 07, 2015
popeyemth wrote:
Thanks for the feedback!
Can you tell us what size (BTU) air conditioner you have?
Thanks,Mike

Its the new Coleman mach 8 (low profile) 9200.
The starter capacitor will be hear soon (Amazon take forever to ship stuff if you pick free shipping)

before I install the capacitor I plan to do a test with a Kill-A-Watt meter. I will post results
jmcgsd
Explorer
Aug 07, 2015
towpro wrote:
FYI: Yesterday I was test running my generators. To run them under load I just hook them to the Pickup camper. Anyway, with the AC being turned on and off by a relay that is fired by a thermostat, using the Honda 2000, the AC still starts and runs even with the Generator on Eco mode.
on Eco mode, the overload light does flash for a second during startup but generator RPM climbs, AC starts and overload light goes out.

My EU2000i runs the A/C in my 28' TT just fine even at altitude (6700'$
popeyemth
Explorer
Aug 07, 2015
Thanks for the feedback!
Can you tell us what size (BTU) air conditioner you have?
Thanks,Mike
towpro
Explorer
Aug 07, 2015
FYI: Yesterday I was test running my generators. To run them under load I just hook them to the Pickup camper. Anyway, with the AC being turned on and off by a relay that is fired by a thermostat, using the Honda 2000, the AC still starts and runs even with the Generator on Eco mode.
on Eco mode, the overload light does flash for a second during startup but generator RPM climbs, AC starts and overload light goes out.
towpro
Explorer
Aug 03, 2015
thanks everyone, at least for PA 98 deg, 98% humidify summers, turning the AC internal fan off between compressor cycles fixed my problem. the inside humidify stayed down around 50% all weekend inside RV.
Airstreamer67
Explorer
Aug 03, 2015
I always have a dehumidifier with me for extra air drying when the air conditioning or heating does not keep humidity levels where I like it. I also have a separate AC line that can be plugged into the campground dedicated to the dehumidifier should the load be too much for the OEM 30-amp system.
popeyemth
Explorer
Jul 30, 2015
Yes,the start capacitor is still in the circuit.
towpro
Explorer
Jul 30, 2015
new thermostat installed, which triggers relay, which completes circuit to turn AC on. Humidify problem gone.

But I still want to look into a delay start for the fan as we discussed, when starting it sounds like there is more load starting both fans and compressor all the same time.

I need to talk to my EE buddy (he specialized in AC and motors, I specialized in Digital). Will startup capacitor still function if your starting compressor and fan from no power condition?

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