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Old 01-31-2007, 08:59 AM   #15
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No heatpump when dry camping

I was just about to respond that I would have to give the heatpump mode a try at the FCU rally and then I woke up and realized we won't be plugged in. Don't think I'll try it on the Honda 2000i. -KL
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Old 02-03-2007, 12:11 PM   #16
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No one has yet mentioned the issue of who pays for your heat.

If you are running the furnace you are burning the LP that you paid for. If you are running the heat pump you are using the campground's electricity. I realize that you are paying for the campground's electricity, but they are not going to give you a rebate if you don't use it.

I also have used a heat pump at low temperatures. In our trailer, the furnace will automatically start to provide supplemental heat when the heat pump senses the need for it. Generally this is a good thing, since at those temperatures there is a possibility that your pipes and tanks may freeze.

Always remember that the heat pump will NOT provide any freeze protection to your pipes and tanks. The furnace will.

I think you'll be happy with a heat pump.

Loren
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Old 02-03-2007, 04:26 PM   #17
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I think that folks think that heat pumps are not working because they feel the outlet air and it isn't real hot like a ceramic heater.

Heat pumps, both residential (I have owned one) and RV, put out a whole lot of air at just a few degrees hotter than the input air. However, because of the large amount of air moved, there are a lot of BTUs added.

This morning there was ice on my windshield, but my heat pump kept the trailer cozy all night and I only heard (and smelled) the furnace come on once in the very early morniing.

I did use the ceramic heater in the bathroom for my shower last night rather than boost the temperature in the entire trailer. Other than that and initial warm-up from cold-soaked trailer, we use the heat pump exclusively.

In a lot of ways, outside of the bathroom, the steady heat from the pump at just above room temperature is more comfortable than the furnace cycling.
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Old 02-04-2007, 01:37 AM   #18
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OK guys, I'm putting together a system with a 15k BTU Penqiun heatpump with the Comfort Control Center that will switch over to the furnace automatically.

Since my trailer is NOT ducted, I'm trying to figure out the ceiling package. I assumed it would look similar to this without the knobs.

However their website shows this one toward the center of the page. But I think that is the same as this which reads like its for ducted systems.

So, anyone who has a heatpump with the CCC package, what does your ceiling peice look like?

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Old 02-04-2007, 07:11 AM   #19
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Not the same!

Hi Tim,

Your links show 2 different lower units which have 2 different install modes. The one from the Dometic web site is strictly for ducted applications and uses the Comfort Control Center which is attached via a 4 conductor phone cable to the PC control board in the upper unit. While it will spill out conitioned air from the adjustable grill at the rear of the unit (the return is just in front), it does not distribute the air horizontally like the non-ducted version.

The other lower is for non-ducted applications andd is not compatible with the CCC, as it has it's own thermostat with a rotary temp control (mechanical with no degree settings) on one side and a selector switch for mode and fan speed on the other side.

AFAIK, the 2 are not compatible, but you can use either unit with your upper 15K heat pump. You could modify the ducted version with a forward and rearward facing set of outlets that drop out of the ceiling, but that would be a lot of work......though not impossible. It might require a dropped plenum on the ceiling as there isn't much depth to an A/S ceiling, but you could make it decorative and use........ALUMINUM (what a concept!)

Let me know if you have any other questions about this, I work on these ducted units on a daily basis and have seen lots of install methods from the MoHo OEMs..............
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Old 02-04-2007, 09:23 AM   #20
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Tim,

I hate to disagree with my friend Lew, but I will.

The Model number for a 15k Heat Pump should be 630516, and it is useable with an 3106615 airbox. Here's the Installation Instructions http://www.dometicusa.com/pdf/3109529.069.pdf

If you read the text next under 'Interchangeable Fit" in your Dometic link, it says it can use either the ducted method or the airbox.

I don't have the heat pump feature on mine, but the installation instructions (link above) doesn't distinguish between the two.

Here is a picture of my airbox installed. I want you to make one IMPORTANT change when you install the airbox.

In the second picture you will see that I added two foam strips just inside the metal ribs in the ceiling template. If you don't do this, air will short circuit between the supply plenum and the return plenum. This is because of the curvature of the roof not matching the flat airbox. The ribs in the airbox seal against the inside of the ribs when it is flat, but there is about a 1/4" gap the full length if the roof is curved.

I don't know if Airstream does this when they retrofit Penguins to vintage units, but if they don't it could explain some of the poor performance issues that have been reported .
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Old 02-04-2007, 10:57 AM   #21
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I had to replace the Penguin heat pump on my 2000 AS. Apparently the PO had tried to run it on low voltage and burned it up. It's a great unit - but awfully expensive for the "heat pump" convenience and auto "switch-over function. Its' cost was over 2.5 times the cost for a standard 13.5 rooftop Dometic - which I replaced on my previous motorhome. For the record, the MH A/C had the heat strips and I would judge them as being equally effective. Some of the cost differential may have been the result of replacing the heat pump at Jackson Center vs replacing the standard A/C at a local RV dealer.
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Old 02-04-2007, 11:51 AM   #22
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Thanks guys.

Dometic sent me the Quick Cool ceiling package like this. I did tell them it was for a non ducted trailer.

But I could not find that pdf Don found. Thanks. That shows the airbox I thought I needed which looks just like the one you pictured with the vents on the ends and the return on the bottom.

I'll call them Monday and double check. They need a chart on their website so you can see this stuff more easily.
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Old 02-04-2007, 12:14 PM   #23
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Mark,

Perhaps you misunderstood my post (or maybe I did). The ADB (air distribution box) sends that cooled (or heated) air forward and back thru the horizontal vents and has mechanical controls.

The ducted Quick Cool ceiling package that's used with the Comfort Control digital T/stat will send the air in only one direction......DOWN thru the only vent that it has (Dometic calls it an air shower.....oops, that's Carrier that calls it an air shower anyway, you get the picture! ) if there are no other ducts to distribute the air and will not send it forward and aft like the ADB will. It is located directly under the evaporator's blower and puts out quite a bit of air, but it will only blow in the downward direction or slightly to either side. Just a matter of choice as to how you want the air distributed in your trailer .

Tim, I hope they told you that you need a remote temperature sensor with the CCC. It should come in your electrical package and there should be instructions as to it's placement for best operation.
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Old 02-04-2007, 12:26 PM   #24
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Quote:
Originally Posted by lewster
Mark,

The ducted Quick Cool ceiling package that's used with the Comfort Control digital T/stat will send the air in only one direction......DOWN thru the only vent that it has
Lew,

What I'm saying is that you can get the Comfort Control Center electronic digital thermosat with the ADB also. That's the only point we dispute, I think.

The CCC thermostat will work by itself, without the remote temp sensor. You do need to have a 'good' location for mounting, on a interior partition, away from windows, out of direct airflow, near the return, etc. I think it might be easier to use the remote sensor.
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Old 02-04-2007, 01:52 PM   #25
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My question was pretty convilouted (sp?).

What I wanted to know is if Dometic sent me the wrong part. They sent the Quick Cool celiing peice and I was pretty sure I needed an Air Duct Box (ADB) since my trailer is NOT ducted.

I just could not find the ADB for the Heatpump model until Don sent that PDF.
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Old 02-04-2007, 06:37 PM   #26
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I Stand Corrected!

Ok, Dometic pulled a fast one on me and never notified me in my regular dealer correspondence and tech updates about the 'NEW' ADB that is compatible with the CCC (they blanked out the 2 sections where the old manual controls go!). In the past (like last year) this was not a possible combination and could not be ordered as such.

I see that you can now get the same combination as an option on your NEW Airstream....direct from the factory as a mid-year upgrade.

NICE!!!!!!!
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Old 02-04-2007, 07:52 PM   #27
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I am looking at gen sets and wondering about efficiencies of the heat pump compared to reg AC any comments? I am considering the Yamaha 2400. it is rated at 2000 continuous and 2400 for 20 minuets and will handle 6000 for a few seconds. I may be able to get away with putting a hard start capacitor on my existing AC but I am thinking that a more efficient AC may be better than spending more for a larger Gen set?
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Old 02-04-2007, 08:47 PM   #28
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Tim,
I have the Combo Heat Pump/AC with heatstrip. I like it. At campground where I have Electric it saves on Propane for those chilly but not cold days.
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