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Old 10-20-2013, 12:35 PM   #1
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How to set the on/off temperature differential on Dometic Furnace

New (to me) 2013 23D.

Situation is this: when the heat is on (LPG heat) the heater runs until interior air temp is way too hot, then won't cycle on again until you are reaching for your sweater.

For example if the heater is set for 68, the heat runs until the place is about 71+, then won't come on again until the interior temperature is 65 or so. The heater remains quiescent for a very long time.

I'm thinking that it is cycling too infrequently. So I thought to set the differential temperature to 1 degree to see if that made a difference. (I have no idea what the differential temperature is set to now.)

The User's Guide and the Installation Instructions both give the same directions for setting the differential temperature:

"To set the differential, simultaneously press the PROGRAM button and the up button on the CCC 2 thermostat. "diF1" will appear in the display while the buttons are pressed. See (FIG. 45). To set the 2 degree differential, simultaneously press the PROGRAM button and the down button. "diF2" will appear in the display while the buttons are pressed."

However, this operation seems to have no effect whatsoever, "diF1" or "diF2" never appear in the display.

I've attempted this with the CCC displaying OFF, and with the unit turned off (nothing much displayed) and no effect. I performed the Initialize operation and repeated the process with no results.

Can anyone shed some light on this?

Does anyone else find the cycle times to be too long in terms of temperature "swing"?

Has anyone successfully altered the differential temperature?

Thank you everyone!

Best, Steve
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Old 10-20-2013, 12:56 PM   #2
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The differential on my 2014 was set at 2 degrees when delivered. Like you, I found it to be way too variable. I was able to set mine to a 1 degree differential by following the manual, as you have been trying to do.

All I can recall is that it was not easy but when I got it done, it was better than it had been. It still overshoots greatly the first time it is turned on and will drive you out of the place. I have found that setting it first at about 65 F is a help, then as the place gets warmed up and seems too cool, I move it up about 2 degrees at a time until I am comfortable and it cycles ok. It will stabilize in my comfort range of 71 to 72 after a while.

Overall the Dometic CC2 thermostat is not user friendly or intuitive at all, and I wish we could replace it with something better. I guess it is wired in with it's own unique phone cord type connectors directly to the AC unit, and I have not seen any information on how to use any other thermostat on the system.

I do know that I could remove the conventional thermostat wires from the furnace alone. They could then be connected to a more conventional thermostat so the furnace would operate on it's own, but I have not done that yet. It would not be an integrated system, but might be more comfortable.

Sometimes you wonder if anyone at the Dometic factory other than the Geek who designed the system ever operated it in the real world, or had their grandmother try to use it.
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Old 10-20-2013, 06:50 PM   #3
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Your unit came with a heat pump. That should be used in the fall if your pluged in. Why burn propane?
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Old 10-20-2013, 09:07 PM   #4
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Quote:
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Your unit came with a heat pump. That should be used in the fall if your pluged in. Why burn propane?
Because the heat pump is too noisy.
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Old 10-21-2013, 08:49 AM   #5
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Quote:
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Your unit came with a heat pump. That should be used in the fall if your pluged in. Why burn propane?
You answered your own question.
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Old 10-21-2013, 08:56 AM   #6
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Quote:
Originally Posted by idroba View Post
All I can recall is that it was not easy but when I got it done, it was better than it had been. It still overshoots greatly the first time it is turned on and will drive you out of the place. I have found that setting it first at about 65 F is a help, then as the place gets warmed up and seems too cool, I move it up about 2 degrees at a time until I am comfortable and it cycles ok. It will stabilize in my comfort range of 71 to 72 after a while.
Thanks, this was a great help. I too have found setting it to 64 or so at the beginning does help.

Please tell me this... when you finally did get it set to 1-degree differential, did you actually see the display say "diF1" ?

Thanks!
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Old 10-21-2013, 09:55 AM   #7
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Quote:
Originally Posted by warmrain View Post
Thanks, this was a great help. I too have found setting it to 64 or so at the beginning does help.

Please tell me this... when you finally did get it set to 1-degree differential, did you actually see the display say "diF1" ?

Thanks!
I don't recall now, it was a one time thing when I set it and that was several months ago. I am not home now, but when I get back I will play with the thing and let you know what I find.
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Old 11-17-2013, 02:25 PM   #8
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I found the answer for setting the differential temperature... The instructions say that the unit has to be "Off". Well there is a little ambiguity in that statement. The Mode has an "Off" setting (e.g. "Off" is displayed at the top of the screen). But also the entire unit can be powered down. It is in the latter state that you change the differential temperature by pressing the Program and either the "^" or down arrows in unison. You will get a verification very briefly displayed on the screen (e.g. Diff-1).

Thank you everyone.

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Old 01-11-2014, 08:40 PM   #9
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Temp differntial

Having same issue.
WarmRain, how did you get the thermostat to 'power down'?

Thanks!
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Old 01-11-2014, 08:46 PM   #10
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Sounds like you need to re-set your CCC-II.

•Turn the unit OFF. By this, I mean to use the power button in the upper left corner to get a blank screen.

•Then simultaneously press the MODE and ZONE buttons until the upper screen displays 'iNiT'.

•Release the buttons and again press the power button. This should allow you to continue with your programming.
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Old 01-11-2014, 09:02 PM   #11
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wow. Quick reply, lew. As you were writing, I stumbled around and found the diff1 and diff2 option. Don't know which I was originally set to, but chose the diff1 and am testing now.

Regarding your note, does resetting my CCC-II (I'm assuming that's the thermostat) bring it back to default/factory settings?

I'll report back on the Diff-1 setting soon.

Thanks folks.
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Old 01-12-2014, 02:18 AM   #12
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I don't know if this applies to you or not. When using the gas heater, the bedroom was cold enough to make apple-jack while sitting at the dinette in a t shirt would have sweat popping out on my forehead. The solution was a portable fan to keep the air temp the same through out the coach. I'm fixin' to mount a couple of permanent 12 volters on the wall to solve the problem proper like.
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Old 01-12-2014, 11:07 AM   #13
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Quote:
Originally Posted by warmrain View Post
I found the answer for setting the differential temperature... The instructions say that the unit has to be "Off". Well there is a little ambiguity in that statement. The Mode has an "Off" setting (e.g. "Off" is displayed at the top of the screen). But also the entire unit can be powered down. It is in the latter state that you change the differential temperature by pressing the Program and either the "^" or down arrows in unison. You will get a verification very briefly displayed on the screen (e.g. Diff-1).
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Old 01-12-2014, 12:37 PM   #14
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One of the difficulties is where my thermostat is mounted. I've owned 2 Airstreams, a Safari and Classic and in both cases the thermostat is on the wall which houses the refrigerator. The wiring passes through a small hole and enters into the refrigerator compartment. If you use the vent fan in the bathroom for showers or other purposes you can be guaranteed excessive run time of the a/c unit in the summer or excessive furnace activity in the spring and fall. Be sure to caulk this hole to minimize air infiltration to the thermostat.

Jack
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