The Texas heat is coming! We have a Momentum 320G. Has anyone had a third a/c successfully added to their garage on a unit that came prepped for it from the factory? What all is involved? The more research I do, the more confused I get. The more answers i get, the more questions I have. According to the build sheet the unit is prepped for a 3rd a/c but apparently that doesn’t include the EMS. Some are of the opinion it’s no longer necessary on 2020 models. Hearing also that if the existing 2 units are wired to one leg of the breaker panel, that the 3rd unit should be pre-wired on the opposite leg and that you can plug and play if so. Have also heard the added unit will have its own EMS built in. Need expert advice here as this needs to be done sooner than later. Just can’t get a straight answer on how it needs to be done. The how determines the cost. Was told by dealer to add EMS system to make everything work correctly could cost upwards of $5K 😳. There has to be an easier way, especially if I’m prepped for it already. Right?
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Originally posted by Fire Marshal Bill View PostThe Texas heat is coming! We have a Momentum 320G. Has anyone had a third a/c successfully added to their garage on a unit that came prepped for it from the factory? What all is involved? The more research I do, the more confused I get. The more answers i get, the more questions I have. According to the build sheet the unit is prepped for a 3rd a/c but apparently that doesn’t include the EMS. Some are of the opinion it’s no longer necessary on 2020 models. Hearing also that if the existing 2 units are wired to one leg of the breaker panel, that the 3rd unit should be pre-wired on the opposite leg and that you can plug and play if so. Have also heard the added unit will have its own EMS built in. Need expert advice here as this needs to be done sooner than later. Just can’t get a straight answer on how it needs to be done. The how determines the cost. Was told by dealer to add EMS system to make everything work correctly could cost upwards of $5K 😳. There has to be an easier way, especially if I’m prepped for it already. Right?
For clarification, are you using the acronym "EMS" for "Electrical Management System"? To (most of) us here, that is a component like a Progressive Industries EMS-HW50C:
If "EMS" means something else, can you please clarify?
Again, welcome!
HowardForum moderators are not GD employees--we are volunteers and owners presumably just like yourself. Unless specifically mentioned otherwise, we have nothing to gain should you choose to purchase a product or engage a service we discuss on this forum.
2017 Ford F-350 DRW, '19 315RLTSPlus
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Sorry, the Power Control System. I am prepped for third a/c but do not have the panel that comes in the cabinet with my main controls. I’m not sure that adding a 3rd a/c will work without this. There is much confusion surrounding this. I was assuming that since my unit is prepped for a 3rd a/c unit that it would be a fairly straightforward process to add one.1 PhotoLast edited by Fire Marshal Bill; 04-27-2020, 08:12 AM.
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Originally posted by Fire Marshal Bill View PostSorry, the Power Control System. I am prepped for third a/c but do not have the panel that comes in the cabinet with my main controls. I’m not sure that adding a 3rd a/c will work without this. There is much confusion surrounding this. I was assuming that since my unit is prepped for a 3rd a/c unit that it would be a fairly straightforward process to add one.
I do not know if it specifically applies to your Momentum, but the diagram does give a clue as to it's purpose. Specifically, the Power Control System (PCS) is a load-shedding device, meaning that when it senses too much simultaneous demand it will "shed" one of the loads to keep from overwhelming the capability of the trailer's electrical capacity.
GDRV-Megan or GDRV-Emily:
1) Does GD consider the PCS a required piece of equipment in conjunction with the installation of the third air conditioner in a 320G?
2) What is the PCS model used in the 320G? http://precisioncircuitsinc.com/category/all-products/ has "Midi PCS", and "Midi-Power Control System" that all look similar to Fire Marshal Bill's picture.
TIA!
HowardForum moderators are not GD employees--we are volunteers and owners presumably just like yourself. Unless specifically mentioned otherwise, we have nothing to gain should you choose to purchase a product or engage a service we discuss on this forum.
2017 Ford F-350 DRW, '19 315RLTSPlus
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howson GDRV-Megan Fire Marshal Bill
I would recommend contact our support team to get the most accurate info in regard to this question. They would be best suited to find an immediate answer. You can email them at customerservice@granddesignrv.com or you may call t hem at 574-825-9679 Mon thru Fri 8-5 EDT
I would encourage you to post the info here that they provide so that others can have access to the info!
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I called Grand Design as suggested. We double checked by VIN that my 320G was prepped at the factory for a third a/c. It was. I was told by the tech that I would need to use a dump type a/c as a stand alone unit which won’t be tied into the 320G’s ductwork. It would be controlled at the unit itself, by way of a step stool in my case. Was told a prepped unit has wiring up in ceiling at the location of the garage power fan. Removal of this fan will leave a 14”x14” opening which is standard for rv air conditioners. There is also a breaker already installed in the panel for a third unit (see pic). So the good news is it’s basically a plug and play deal! If I can locate an a/c unit with a remote control I’ll be set 😂.1 Photo
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Originally posted by Fire Marshal Bill View PostI was told by the tech that I would need to use a dump type a/c as a stand alone unit which won’t be tied into the 320G’s ductwork.
Forum moderators are not GD employees--we are volunteers and owners presumably just like yourself. Unless specifically mentioned otherwise, we have nothing to gain should you choose to purchase a product or engage a service we discuss on this forum.
2017 Ford F-350 DRW, '19 315RLTSPlus
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Originally posted by TriplethreatSo, they didn't mention that as part of the "prep" package that it had a thermostat cable already pulled in and ready to hook up at both ends? It seems to me that any A/C prep package should also include that multi-conductor cable from where the unit goes, to a location on a wall for the thermostat. With my Keystone trailer, it did.....maybe not so much with Grand Design. It might be worthwhile to check with them again or see if Emily can find out for you. Having to climb up on a stool or short ladder would be unacceptable to me.
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Originally posted by Fire Marshal Bill View Post
I called back and was told there was a thermostat wire in the wall. I will have to investigate to confirm. I hope so!
BrianBrian & Michelle
2018 Reflection 29RS
2022 Chevy 3500HD
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