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Old 07-22-2022, 09:10 PM   #1
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Second Air Conditioner for ST33FR

My ST33FR came wired for a second AC unit. I think that the factory option was for a 13.5. Can anyone confirm?

Anyone know if I'll also need a control board? Anything else I'll need?

https://www.trekwood.com/products/66...lack-48253C969

The 15k unit that I have just isn't cutting it in 105 degree heat.
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Old 07-27-2022, 07:49 AM   #2
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So.. I guess nobody has a second AC unit in a similar setup?
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Old 07-27-2022, 08:28 AM   #3
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looked up the specs for your camper and under options it lists "Second AC 13500 BTU in bedroom" The part about a control do not know. Check with the manufacturer of your current AC and the brand you want to install and ask what would be needed to make it work.

The easiest way would be to install a 13500 or whatever size you want that has the control's on the AC itself.

Our camper is a 2009 and it has 2 AC's 13500 in the front and 15000 in the main part. Both have control boards. The rear control board also controls the furnace. There is a 5 button CCC - Comfort Control Center Thermostat. But this is my camper yours will probably be different.

Sorry I could not be more specific.
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Old 07-27-2022, 11:03 AM   #4
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Just speaking about my Rv, if I install a second A/C, it does not connect to the central venting system. It is a stand alone A/C that only dumps the air into the bedroom where it would be installed.
Your setup may be different.
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Old 07-27-2022, 03:34 PM   #5
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Thanks everyone.

I pulled down the surround on the roof vent and it does have a duct that connects it to the other system. I'm not sure why that is.. if they're meant to blow into the same ducting system or if the AC unit is meant to block off the duct and then just blow directly in that room.. Right now, the opening is covered by aluminum tape.

Think I should do a ducted one?
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Old 07-27-2022, 05:10 PM   #6
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HVAC air flow is a science. Supply and returns (returns are usually sized 25% larger than supply for moisture evaporation) must work together. RV's, I think are closed systems, meaning all air movement is circulated internally. I am of the belief that if you were to feed air from the 2nd unit into ducting that was opposed to the other AC outflow - that might be counterproductive for circulation and moisture issues. Only my 2 cents. Perhaps an HVAC technician with RV experience would chime in here.
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Old 07-27-2022, 05:32 PM   #7
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When you pulled the vent surround were there any other wires there besides the power wires? If you install one with a stand alone thermostat than you would have to pull those wires.

On ours the front AC and the rear AC are all on the same ductwork. If the front AC is off you can still feel a small amount of air from the rear AC. They share the same thermostat control but the front has a temperature sensor on the wall. The thermostat has control's for both AC's - on ,off. and fan speed as well as heat.

Just saying that is how mine is yours could be different.
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Old 07-27-2022, 06:34 PM   #8
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Dan, Have you ever run just the front AC and checked to see if you can feel any air flow down stairs on those vents?
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Old 07-27-2022, 07:13 PM   #9
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Yes. Just like the front you can still feel some at the back. With the second AC being a option if you did not get it the rear would have to cool the front also. This is the first one we have had with the second AC so it may be it is not supposed to be connected. But if the owner added the second one later they would be connected. It is probably 30 feet from one AC to the other. Sometime when I get ambitious I have a endoscope and I may pull a vent down just to have a look.
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Old 07-29-2022, 09:57 AM   #10
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My camper has been pre-wired. There is a thermostat sensor in that room on the wall and the thermostat is a dual-zone. There is power there by the "future" second unit.

In the fuse panel, it's marked "Second AC"

I'm thinking that maybe I will go with the ducted unit. I'm hoping I can get the same interior kit as the main unit yet.
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Old 07-31-2022, 02:49 PM   #11
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I would think it's should be all plug and play. The hardest part will be cutting a hole in the roof.
Good Luck!
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Old 07-31-2022, 06:38 PM   #12
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I would think it's should be all plug and play. The hardest part will be cutting a hole in the roof.
Good Luck!

If he already has a roof vent over the bed, there shouldn't be any need to cut a hole. It will be there.
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Old 08-02-2022, 09:08 AM   #13
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It is.. I'll take down the vent shroud later today and post a picture of what I have.
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