Mattress Moisture Problem?

[Silver Goose]

Originally Posted by dznf0g

However, be aware that if you disconnect your batteries (I think at the post only...I believe there is a live keep alive circuit if you use the disconnect switch) you will need to reprogram this feature upon reconnecting the batteries.

This may be model dependent. I have the 5-button CCC. The programming on mine was done by some DIP switches and jumper on the board in the ceiling unit. I've had the batteries out and the power off when I replaced the Parallax unit and auto switchover to furnace still worked afterwards.

[dznf0g]

Originally Posted by Silver Goose

This may be model dependent. I have the 5-button CCC. The programming on mine was done by some DIP switches and jumper on the board in the ceiling unit. I've had the batteries out and the power off when I replaced the Parallax unit and auto switchover to furnace still worked afterwards.

Hmmm. mine is also a 5 button, but my manual even spells it out (in very small print). I'll have to look it up again.

[dznf0g]

OK, I have a five button, but apparently all 5 buttons are not created equally.
Mine is part #3109228.001 The manual does not mention dip switches at all, but discusses auto switchover. HOWEVER IT DOES NOT STATE HOW TO PROGRAM IT.

I had forgotten my information came from forum member Lewster, here:

http://www.airforums.com/forums/f427...ion-71069.html

I have a hand written note on Lewster's post #3 which says anytime battery is disconnected OR STORE SWITCH is switched of, I must reprogram.

I must have experimented with this last spring. Sounds like maybe there was a change in the 2008 CCCs???? It would be nice not to have to mess with reprogramming!

[Silver Goose]

Originally Posted by dznf0g

OK, I have a five button, but apparently all 5 buttons are not created equally... anytime battery is disconnected OR STORE SWITCH is switched of, I must reprogram.... Sounds like maybe there was a change in the 2008 CCCs???? It would be nice not to have to mess with reprogramming!

That definitely sounds like a design in need of a change. Apparently Dometic stepped up to the plate and made a revision.

[dznf0g]

Originally Posted by Silver Goose

That definitely sounds like a design in need of a change. Apparently Dometic stepped up to the plate and made a revision.

Are you sure? I think the dip switches in the overhead unit: 1) just activate the signal to the CCC that the minimum temperature has been met and 2) make the CCC recognize the furnace option is available.

I believe in order for the CCC to take that dip switch information and ACTUALLY perform the switchover, the CCC must be programmed per Lewster's info.

Some of my theory is reading between the lines in several of Lewster's diagnosis threads. Maybe he'll chime in.

[Silver Goose]

Originally Posted by dznf0g

Are you sure? I think the dip switches in the overhead unit: 1) just activate the signal to the CCC that the minimum temperature has been met and 2) make the CCC recognize the furnace option is available.
...

I think we're zeroing in on this. The "programming" is done at installation by the DIP switches jumpers and plugging on the control board in the ceiling unit. That tells the system exactly what combination of hardware is installed. There is firmware somewhere (maybe in the CCC or in the control board) that controls what is displayed on the CCC and how the various functions operate. The procedure Lewster outlined in his post is a hard reset, similar to rebooting a PC to reload a fresh copy of the firmware. I've had to do it, but for a different reason. As I recall the fan started to run continuously regardless of settings. The reset fixed it. They may have changed the firmware at some point, but I've not had the experience of losing the Aux Heat function after a total power disconnect.

[lewster]

Originally Posted by dznf0g

Are you sure? I think the dip switches in the overhead unit: 1) just activate the signal to the CCC that the minimum temperature has been met and 2) make the CCC recognize the furnace option is available.

I believe in order for the CCC to take that dip switch information and ACTUALLY perform the switchover, the CCC must be programmed per Lewster's info.

Some of my theory is reading between the lines in several of Lewster's diagnosis threads. Maybe he'll chime in.

Correct! The dip switches tell the CCC what features you have and want to activate (things like furnace, auto generator start or which A/C unit this is; the latter features are normally used on motor homes with integrated generators or multiple A/C units) and the CCC must be re-set every time the dip switches are changed or the DC power is removed from the CCC. It tends to forget what it was told (sort of like most of us as we get on in years!!!)

Anyway, when the furnace option is activated on the relay board via the dip switches of a Duotherm heat pump, the relay board reads the outside ambient temperature via a remote temp sensor located on the upper A/C unit and will tell the relay board to switch from heat pump to furnace when the outside temps drop below the normal operating range of the heat pump.

At least that how Dometic says it should work. YMMV!!!!!