replacing my rear A/C

[shepardmike]

Trying to get ahead of this before the new ac arrives. I am not sure if I am fortunate that the same Penguin unit is still available or not, but I bought it anyways. So I am trying to figure out what mods were made by FR. I see the module screwed into the front plastic shroud that looks like the interface to the inside control panel (circled in red). When I first got the coach the ac would freeze up so I installed the freeze sensor (circled in yellow) and purchased a new one for the new install. So what else do I need to address?

Notes -

Look for DIP switch settings
Look for ambient temp sensor
Use Dicor on AC mounts
Seal any holes gaps

[Eric B FR Diesel]

what year is your coach? my guess is it has Dometic AC units on it as the box circled in red looks like a analog to digital convert that was used as the Dometic A/C could not operate with a digital signal. Try Precision Circuits, as they supplied the digital to analog boxes.

https://www.precisioncircuitsinc.com...hvac-module-2/

[shepardmike]

Eric - the 34QS is a 2019 but actually built in late 2018. According to Dometic, the AC's were manufactured in 2017.

I'll reach out to Precision. Thanks!

[shepardmike]

The new AC came today and it's missing a part? Not sure if this is a Dometic part (support closed now) or a Berkshire part? Looks like the new pigtail would plug into this box. Is this also a swap over item?

[Lincman983]

What is missing is the D/A converter box that Eric mentioned further up the thread. Contacting Precision Circuits would be your best bet as they were the OE supplier of the D/A box

[shepardmike]

So I am missing the Dometic Analog Control board that's in this zoomed picture. I have since ordered a new one which comes with a thermostat that I wont need, but ok. There is a wiring harness from the Precision A/D converter that goes to the control board, and I can see red, white and blue wires that look taped together and don't go anywhere. The red say "TO TSTAT".

@Lincman983 - do you have a wiring diagram for this interface?

Vin - CKN7815

[Lincman983]

Originally Posted by shepardmike

So I am missing the Dometic Analog Control board that's in this zoomed picture. I have since ordered a new one which comes with a thermostat that I wont need, but ok. There is a wiring harness from the Precision A/D converter that goes to the control board, and I can see red, white and blue wires that look taped together and don't go anywhere. The red say "TO TSTAT".

@Lincman983 - do you have a wiring diagram for this interface?

Vin - CKN7815

Here are some prints of the a/c controller, multiplex harness. Not dure if that model of a/c has the heat pump but I attached a print for it as well.

[shepardmike]

Originally Posted by Lincman983

Here are some prints of the a/c controller, multiplex harness. Not dure if that model of a/c has the heat pump but I attached a print for it as well.

That looks like them! Thanks...

[shepardmike]

Originally Posted by shepardmike

So what else do I need to address?

Darn, nobody mentioned the Dometic drain kit

[Eric B FR Diesel]

are you referring to the drainage pump?

[shepardmike]

No. It's not mechanical. It attaches to the bottom.


https://www.bzbproducts.com/dometic-...75bd64ee22b564

[shepardmike]

So I got the drain kit installed and now I am struggling with the wiring. The connector coming off the Digital/Analog control board has 5 wires, AFH, AFL, COMP, AHT and GND. The Dometic control box has 4 wires, +12 V to T-STAT, +12 From Supply, -12V from Supply and to T-STAT, and COMM.

Do I have to open the controller and try to find AFH (Fan High), AFL (Fan Low) and splice into them?

Dometic controller = 3316230.700

Maybe there is a specific controller to install?

[shepardmike]

Eric or Linc,

I am trying to call FR Parts Dept. I have in my notes, Jackie Grey @ 574-522-1747.

Is that still valid? All I get is an answering machine .

[Lincman983]

Yes, that is the correct phone number. I believe the parts dept was closed due to inventory Tuesday.