Author Topic: Replacement roof AC  (Read 467 times)

Joe DeWeese

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Replacement roof AC
« on: February 17, 2022, 05:21:50 PM »
I own an ‘06 Monterey Laguna iV.  My front roof AC is slowly dying.  I’m looking for a replacement.  Based on the info label inside it is a Dometic Duo-Therm 630516.  However, it appears that model is no longer made.  I contacted Dometic looking for a replacement part number.  The customer support rep. sent me a Model #651816.  However this appears to be a heat pump/air conditioner.  The customer support said that this is the replacement model.  I don’t need or want a heat pump, just an AC.  Is here another AC part that would be a direct replacement for my current model?
Thanks, Joe D.
06 Monterey
CAT C9

Bill Lampkin

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Re: Replacement roof AC
« Reply #1 on: February 17, 2022, 05:37:29 PM »
Joe, the heat pump is just an A/C running in reverse; other than one valve, there is no difference betwixt the two units. Go with the heat pump unit, you do not have to use the heat pump feature, it will work as AC only just fine.
2005 Patriot Thunder Lexington, 3 slides
40' tag axle (short wheelbase)
525 hp C13

"Goin where the weather suits my clothes..."
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Bryan Beamon

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Re: Replacement roof AC
« Reply #2 on: February 17, 2022, 11:23:17 PM »
Joe, you probably know this but as a reminder you will need to order an adapter for your thermostat if you have the 5 button thermostat for it to function with your new AC.
C & Bryan Beamon
2006  to present
2007 Contessa 42ft Cat C-9 400hp
1996 to 2006 97 Beaver Patriot Camden

Joe DeWeese

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Re: Replacement roof AC
« Reply #3 on: February 17, 2022, 11:48:57 PM »
Hi Bryan,
     No I did’t know that.  I assumed that since I was told by a Dometic customer support rep that this new Dometic (Model 651816) is a direct replacement for my current one (Model 630516) replacement would only require the AC unit and a new gasket. 
     Thanks for the heads up.
Joe D
06 Monterey
CAT C9

Joel Ashley

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  • OSU Class of '73, Oregon Native. RVing 37 years
Re: Replacement roof AC
« Reply #4 on: February 17, 2022, 11:54:04 PM »
We have the original Duo-therm roof units too and one’s AC is gone.  If lucky, all it may need is a start capacitor, so think about having a trustworthy tech check that possibility before spending on a whole new unit;  there are YouTube videos that describe checking it yourself.   And, yes, a model change requires a thermostat adapter.  There’s been much angst expressed in forums about that and incorrect or negligent tech work regarding it.  It’s one place, since absorbing Duo-Therm, that Dometic hasn’t necessarily helped replacements be easy.

Unfortunately, the units’ shells are now so brittle that they crumble during removal to access the roof parts.  Replacement shells are ~$136 but are touted to be of better materials than were used in 2006. 

Regarding the heat pump aspect, ours both have that feature and we’ve found them useful.  When watching TV in either the bedroom or the living area, the hydronics system’s heat exchangers are annoyingly loud.  By running roof heat in the opposite end of the rig instead, and aiming the roof ports appropriately, interfering heating noise is effectively limited.  Of course the limitation is that heat pumps don’t work in outside ambient temps much below 40F.  I’d rather have the option than not, and the thermostat should already be set up for it if techs are well versed in the update parameters.

Joel
Joel and Lee Rae Ashley
Clackamas, Oregon
36.9 ft. 2006 Monterey Ventura IV, aka"Monty Rae"
C9 400HP Cat
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