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Topic: Furrion AC refit - Aqua Hot issue (Read 687 times) previous topic - next topic

Furrion AC refit - Aqua Hot issue

I have installed the new Furrion ACs and the Furrion thermostat, and the ACs are working.  But I am having trouble with the Aqua Hot.  I have followed Jeff's excellent procedure and have consulted him personally (Thanks!), but my issue goes beyond his experience.

The AH fans for the living room and bedroom won't come on.  The bathroom, with its separate thermostat, is working fine.  When I set thermostat to heat, the fans do not come on.  When I attach the aqua hot command wire in the AC opening to ground, the fan does not come on.  When I ground the wire at the AH unit, post fuse, the fans operate.

The Foretravel drawing A-6204 shows two relays for bedroom and living room "mounted close to AH unit."  Are these the zone relays inside the AH box?  I have tried switching them, but the problem did not "migrate." 

Are there other relays? Or is this a depiction of the thermostat function?  Is there anything between the fuse inside the AH and the command wire in the AC opening other than the wire itself?

I feel like I am missing something simple and bold.  Any ideas, you wonderful people?
Matt B
1998 u-320

Re: Furrion AC refit - Aqua Hot issue

Reply #1 –
Rudy, are you around today?
Matt B
1998 u-320

Re: Furrion AC refit - Aqua Hot issue

Reply #2 –
Update

I believe I have found the relays shown on A-6204.  They are inside the AH box, attached to a rafter, where I couldn't see them until I stuck my head in the AH box.

Still working and watching for a revelation!
Matt B
1998 u-320

Re: Furrion AC refit - Aqua Hot issue

Reply #3 –
So I get continuity from the fat white wire that comes from the driver side of the front AC box to terminal 86 of one of the relays.  I assume this the living room/ bedroom relay on the wiring diagram A-6204, wire A7.

So maybe I have the function of this wire wrong.

I THOUGHT this wire supplied +12V, and would activate the fan when it is grounded, either directly or through the relay contained in the AC controller box.

Is this wire a RETURN of a +12V provided elsewhere, fed through the relay inside the AC controller box, which activates the relay inside the AH box to activate the fan?  Stepping ahead on that assumption, would I attach one side of the relay inside the AC box to the +12V supply for the AC operation, and use my wire A7 to attach to the "output" of the AC controller box?

This would not be consistent with Jeff's instructions, though his description might be correct for HIS setup.
Matt B
1998 u-320

Re: Furrion AC refit - Aqua Hot issue

Reply #4 –
There are two brown wires for heat (AH) control coming out of the Furrion box.  As I recall I connected one to the white wire from the AH (doesn't matter which one) and the other to the green wire going to ground somewhere towards the front of the roof opening framing.  The Furrion just has a relay the open or closes to control the AH (or furnace).  The AH zone comes on when the +12v wire is connected to ground.  Seems counterintuitive but it works.
Roger Engdahl and Susan Green
2001 U320 3610 #5879 (Home2) - 2014 Jeep Cherokee or 2018 F150
Hastings, MN

Re: Furrion AC refit - Aqua Hot issue

Reply #5 –
Pin 86 is on the coil side of a bosch relay. Could be power or ground. 86 is normally ground side. This circuit gets power( or ground), when the control board ask for power to the pins 30 /87.
 The other 2 large wires should be the controlled circuit , on pins 30 and 87. One should have 12v with key on, possibly all time on)

Re: Furrion AC refit - Aqua Hot issue

Reply #6 –
Quote from: Roger & Susan in Home2 –
There are two brown wires for heat (AH) control coming out of the Furrion box.  As I recall I connected one to the white wire from the AH (doesn't matter which one) and the other to the green wire going to ground somewhere towards the front of the roof opening framing.  The Furrion just has a relay the open or closes to control the AH (or furnace).  The AH zone comes on when the +12v wire is connected to ground.  Seems counterintuitive but it works.
That is consistent with Jeff's procedure, but it didn't work on my coach.  I suspect there is a difference between coaches.

It would seem that the white wire from the AH needs +12V to activate the relay to turn the blower on.  It does not have +12V.  I think the +12V from another source through the wire activates the relay and makes the blower run.  I don't KNOW that yet.  The wiring diagram says "+12VDC from CCC zone going into the relay.

Any idea what "CCC" is?
Matt B
1998 u-320

Re: Furrion AC refit - Aqua Hot issue

Reply #7 –
Pin 85 should be grounding the relay. Pin 86 should be 12v.  But the coil cant tell direction. Check the other pin for ground or 12v. 

Re: Furrion AC refit - Aqua Hot issue

Reply #8 –
Quote from: Protech Racing –
Pin 86 is on the coil side of a bosch relay. Could be power or ground. 86 is normally ground side. This circuit gets power( or ground), when the control board ask for power to the pins 30 /87.
 The other 2 large wires should be the controlled circuit , on pins 30 and 87. One should have 12v with key on, possibly all time on)
Good info.  I will investigate this later today.  The wiring diagram shows 30 and 85 connected to ground, 87 to the AH wiring strip, and 86 to +12VDC  from "CCC Zone 1."  If 86 is power, it suggests my theory is correct.  If 86 is a ground, Jeff's write up would make sense, because the relay in the AC control box would connect this wire to the ground.

I am thinking power applied to 86 would cause 87 to be connected to ground.  THEN with the wire from the Aqua Hot grounded, the blower would operate.  I think!
Matt B
1998 u-320

Re: Furrion AC refit - Aqua Hot issue

Reply #9 –
Sorry the pin numbers were reveresed . pin 86 -12v
 pin 85 , grounded to energize the other 2 pins,

Re: Furrion AC refit - Aqua Hot issue

Reply #10 –
Here is the page with the wiring diagram, A-6204.

Going theoretical here, what would the difference be between the wiring shown, and just grounding wire A7A?  The result is the same best I can tell - I don't get the need for the relay, and I am suspecting that some of you don't have it, and your system DOES connect wire A7A directly to ground through the AC controller box, within the AC ceiling cavity.
Matt B
1998 u-320

Re: Furrion AC refit - Aqua Hot issue

Reply #11 –
Quote from: Protech Racing –
Sorry the pin numbers were reveresed . pin 86 -12v
 pin 85 , grounded to energize the other 2 pins,
I am assuming the "-" is punctuation, and not meaning that a negative 12 volts is applied to pin 86.
Matt B
1998 u-320

Re: Furrion AC refit - Aqua Hot issue

Reply #12 –
Quote from: oldmattb –
That is consistent with Jeff's procedure, but it didn't work on my coach.  I suspect there is a difference between coaches.

It would seem that the white wire from the AH needs +12V to activate the relay to turn the blower on.  It does not have +12V.  I think the +12V from another source through the wire activates the relay and makes the blower run.  I don't KNOW that yet.  The wiring diagram says "+12VDC from CCC zone going into the relay.

Any idea what "CCC" is?

CCC = comfort control center = thermostat.  So on your coach if there is no +12v on the white wire, just continuity to a contact on the relay that turn on and off the AH zone, then yours must need +12v applied to the white wire at the AC end of things to enable the AH zone to turn on.  In that case one of the brown wires gets connected to a +12v source in the AC wiring and the other brown wire gets connected to the white wire.  Thermostat calls for heat, control relay closes, +12v gets applied to the white wire, relay at the other end closes, AH comes on.


Roger Engdahl and Susan Green
2001 U320 3610 #5879 (Home2) - 2014 Jeep Cherokee or 2018 F150
Hastings, MN

Re: Furrion AC refit - Aqua Hot issue

Reply #13 –
That circuit takes a 12v signel and grounds the other line, like you said.

Re: Furrion AC refit - Aqua Hot issue

Reply #14 –
I think we have it!  I am emboldened to where I will rewire it and see what happens.  I will of course report to you fine people.

Any ideas why the relay is used?  Would grounding the wire next to the AH be much different than at the end of (estimated) 20 feet of wire?
Matt B
1998 u-320

Re: Furrion AC refit - Aqua Hot issue

Reply #15 –
It turns a 12 v signal into a ground .

Re: Furrion AC refit - Aqua Hot issue

Reply #16 –
The 1998 Aqua Hot uses ground signals to active the heating zones, pumps and fans.  Most new A/C installs result in no AH function.  The interior thermostats talk to a board up in the A/C which sends the request on to the AH.  This signal must become a ground signal to turn on a heating zone.

If you are now getting a 12 vdc signal at the heater thermostat wires, use a cube relay to convert them to a ground signal.
Rudy Legett
2003 U320 4010 ISM 450 hp
2001 U320 4220 ISM 450 hp
1995 U320 M11 400 hp
1990 Granvilla 300 hp 3208T
Aqua Hot Service Houston and Southeast Texas

Re: Furrion AC refit - Aqua Hot issue

Reply #17 –
Quote from: Rudy –
The 1998 Aqua Hot uses ground signals to active the heating zones, pumps and fans.  Most new A/C installs result in no AH function.  The interior thermostats talk to a board up in the A/C which sends the request on to the AH.  This signal must become a ground signal to turn on a heating zone.

If you are now getting a 12 vdc signal at the heater thermostat wires, use a cube relay to convert them to a ground signal.
Thanks, Rudy.  I guess the other side is - if I have a cube relay already wired and (apparently) factory-installed, I WANT 12 VDC so I can complete the ground connection at the relay.
Matt B
1998 u-320

Re: Furrion AC refit - Aqua Hot issue

Reply #18 –
Any way works so long as the connection at the top of the heater is a ground signal.
Rudy Legett
2003 U320 4010 ISM 450 hp
2001 U320 4220 ISM 450 hp
1995 U320 M11 400 hp
1990 Granvilla 300 hp 3208T
Aqua Hot Service Houston and Southeast Texas
 

Re: Furrion AC refit - Aqua Hot issue

Reply #19 –
I wired the +12VDC through the brown wires of the AC controllers, and into the "demand for heat" wire in the AC opening.  All is good, all works!
Matt B
1998 u-320