Momentum 348M AC

[jdmuth]

I picked up a new Momentum 348M yesterday. While I was running the AC units to see how they worked I noticed the air was not coming out of the ceiling vents as it should. Having read about a few of the holes from the AC to the duct work being sealed, I removed the AC grills and found;

1. The Garage AC was hooked up to the duct correctly.
2. The Main AC was blocked to both ducts, running fore and aft.
3. The Bedroom AC was blocked, and the duct was not open on that side.

I cut the foil tape and folded it back to allow the air flow into the duct work on the main AC. So the Main AC, and the Garage AC are working properly now.

Is the Bedroom duct normally hooked up to the duct work?

Jeff

 

[JCR GD]

My understanding was the ducts run on both sides of the AC units all the way from front to back. Mine does. Not sure about the newer models but I would think they should all be hooked in to the ducts.

It is very nice to be able to run the AC units in the areas you are not in and allow the ducting to distribute cool air so you don't have the noise in the same space you are trying to sleep or watch TV etc. so hopefully you can get it fixed up to work properly.

 

[Brentalive]

My Bedroom AC is only for the bedroom no ducting! Thats on my unit Jd same as yours 348m

 

[RamGunner]

On ours, the garage A/C can be felt in the bedroom, although it's pretty weak airflow after passing all of the other vents.

 

[jdmuth]

My Bedroom AC is only for the bedroom no ducting! Thats on my unit Jd same as yours 348m

I know that Grand Design installs two different styles of AC units. One independent style with control knobs on the unit, and vents to the sides. I believe this style just cools the bedroom.

And the other style that is controlled with the thermostat, and it has no control knobs, nor vents in the cover plate. In fact the cover plate is the same as the main AC units cover plate. It should be tied into the duct work as there are no vents in the cover. Except the sliding dump gate for cooling the area below the AC fast.

The units that are tied to the thermostat they call The Energy Management System, with a 3 zone thermostat. The style that I have is controlled thru the 3 zone thermostat, and should be tied into the duct work.

 

[Brentalive]

I know that Grand Design installs two different styles of AC units. One independent style with control knobs on the unit, and vents to the sides. I believe this style just cools the bedroom.

And the other style that is controlled with the thermostat, and it has no control knobs, nor vents in the cover plate. In fact the cover plate is the same as the main AC units cover plate. It should be tied into the duct work as there are no vents in the cover. Except the sliding dump gate for cooling the area below the AC fast.

The units that are tied to the thermostat they call The Energy Management System, with a 3 zone thermostat. The style that I have is controlled thru the 3 zone thermostat, and should be tied into the duct work.

Yes your right! I just have the one with the knobs on the AC to control it!

 

[james quinn]

Yes your right! I just have the one with the knobs on the AC to control it!

Could be wrong but my guess is that the ones with the controls on the unit itself are non ducted and were likely installed by the dealer. I had two a/c's installed at factory (one in bedroom) on my 313 TT and both had wall thermostats and both were connected to ducts (they call it racetrack ducting). When looking before I bought my trailer dealers were telling me the unit in the bedroom they would put in had controls on unit and just blew into bedroom. I believe ducted units are more expensive than non ducted

 

[jdmuth]

On the Energy Management System, with a 3 zone thermostat, shouldn't the Bedroom AC normally be hooked up to the duct work?

 

[RamGunner]

I would believe so, but Janice could give you a conclusive answer.

 

[jdmuth]

I talked to Jerry at Grand Design Customer Service this morning. He stated that the AC units that are tied into the thermostat with the Energy Management System, should be tied into the duct work on the trailer. Somehow my unit didn't get hooked in during the install.

 

[GDRV Service]

I talked to Jerry at Grand Design Customer Service this morning. He stated that the AC units that are tied into the thermostat with the Energy Management System, should be tied into the duct work on the trailer. Somehow my unit didn't get hooked in during the install.

Hi Jeff & Lee (@jdmuth),

Just to clarify - Jerry advised you the ducting on your RV runs from the center air conditioner to the front and rear, and that the bedroom air conditioner is not ducted (it is a direct dump). Sounds like your air conditioning is working correctly now but if you have further questions, please contact Jerry W. in Customer Support to discuss. He can be reached at (574) 825-9679.

Best regards,
~ Janice

 

[jdmuth]

Janice,

Domestic makes two styles of the AC unit that is on my trailer. They make Non-ducted models that are available with ceiling-mounted air distribution box (AD. These have manual AC unit controls mounted on the ceiling faceplate. These would come with the Dometic Brisk Air II Non Ducted Ceiling Kit.

And they make ducted models that are controlled with the Single Zone LCD thermostat or Comfort Control Center II, and use the Quick Cool Return Grill face plate. I have the Comfort Control Center II thermostat in my trailer.

The AC unit has the Quick Cool Return Grill face plate, which gives me the option to use the slide gate to dump air into the room for quick cooling, but is not designed for that slide gate to be the only source of cooling. With the slide gate closed and the AC unit not hooked up to the ductwork, the unit deadheads, which is just circulating cool air in a closed space. It does nothing to cool the bedroom down.

From Dometic website: The Brisk II’s new air distribution box and return-air grille incorporate exclusive Cold ShotTM technology. This feature temporarily circumvents the RV’s air duct to deliver a sturdy blast of cold air directly into the immediate interior and optimizes air flow and capacity.

The Dometic AC unit in my bedroom was not hooked into the ductwork, as it is designed for.

Jeff

 

[GDRV Service]

Janice,

Domestic makes two styles of the AC unit that is on my trailer. They make Non-ducted models that are available with ceiling-mounted air distribution box (AD. These have manual AC unit controls mounted on the ceiling faceplate. These would come with the Dometic Brisk Air II Non Ducted Ceiling Kit.

And they make ducted models that are controlled with the Single Zone LCD thermostat or Comfort Control Center II, and use the Quick Cool Return Grill face plate. I have the Comfort Control Center II thermostat in my trailer.

The AC unit has the Quick Cool Return Grill face plate, which gives me the option to use the slide gate to dump air into the room for quick cooling, but is not designed for that slide gate to be the only source of cooling. With the slide gate closed and the AC unit not hooked up to the ductwork, the unit deadheads, which is just circulating cool air in a closed space. It does nothing to cool the bedroom down.

From Dometic website: The Brisk II’s new air distribution box and return-air grille incorporate exclusive Cold ShotTM technology. This feature temporarily circumvents the RV’s air duct to deliver a sturdy blast of cold air directly into the immediate interior and optimizes air flow and capacity.

The Dometic AC unit in my bedroom was not hooked into the ductwork, as it is designed for.

Jeff

Hi Jeff & Lee (@jdmuth),

The description I provided you in post #11 is how Grand Design RV designed the heating and cooling in your RV to operate. If you have further questions, please contact Jerry W in Customer Support to discuss them with you one-on-one. He can be reached at (574) 825-9679.

Best regards,
~ Janice

 

[ADIRKS30]

So momentum and Solitude are different there. Our bedroom AC is connected to the ductwork

Sent from my SM-G900V using Tapatalk

 

[JCR GD]

Doesn't sound right to me... they should all be connected unless it is one with controls right on the AC unit.

 

[Ccollondrez]

We just got one and still have not pick it up yet but we w I'll have 3 A/C units will it have ducting

 

[jdmuth]

We just got one and still have not pick it up yet but we w I'll have 3 A/C units will it have ducting

It should be hooked up to ducting.

 

[GDRV Service]

We just got one and still have not pick it up yet but we w I'll have 3 A/C units will it have ducting

Hi @Ccollondrez,

Please add your 17-digit RV VIN to the "About Me" section of your forum profile, and then reply back to this message to let me know when that is done.

Thank you in advance...

Best regards,
~ Janice