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Open Roads Forum  >  Truck Campers

 > Thermostat upgrade in my AF811

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deltabravo

Spokane, WA

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Posted: 05/12/10 10:13pm Link  |  Print  |  Notify Moderator

AF Truck campers use a thermostat which only controls the heat, not the heat and A/C, so there's far less wires to figure out where to connect when doing a t-stat upgrade, unlike the DF toy hauler I did a similar upgrade on a few years sgo.

I remember reading Ken Lenger's t-stat upgrade years ago, and eventually did it on my Desert Fox.

The challenge here is most t-stats are too wide to fit in the narrow space where the stock t-stat resides.

I found a Honeywell RTH221B from Home depot. It fits perfect, and it's inexpensive: $19.83. It uses 2 AAA batteries

http://hbctechlit.honeywell.com/Home/Pro........rmostats/1-Week-Programmable/RTH221B.htm

The stock t-stat barely fits between the edge of the wall and the stereo:

[image]


New t-stat:

(someone had bought and returned this one and cut the top of the package off)

I bought the "open package" because I wasn't really sure if this unit would work in this application or not, so if it didn't work, I didn't feel bad about returning something that was "already open from a previous purchase" since the HD store I went to had one that was open. Had they all been sealed, I would have bought one anyway.

[image]


Remove cover from old t-stat

[image]


2009 Silverado 3500HD Dually, D/A, CCLB 4x4 (bought new 8/30/09)
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deltabravo

Spokane, WA

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Posted: 05/12/10 10:13pm Link  |  Print  |  Notify Moderator

Pull it off the wall. Top wire, red, is the R terminal, bottom terminal labeled W has the white wire and a larger black wire.

[image]


Small screw on bottom of new unit holds the unit to the base plate

[image]


Terminals on the base plate:

[image]


Right side: Rh and W terminals - that's what we'll use:

[image]

deltabravo

Spokane, WA

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Posted: 05/12/10 10:13pm Link  |  Print  |  Notify Moderator

I pulled a little more wire out of the wall:

[image]


Connected the red wire to Rh:

[image]


White and black wire to W terminal:

This picture also shows where I drilled a new upper mounting hole, located between the terminal wiring diagram. The object was to "cover the original mounting holes with the new t-stat, but not need to drill NEW holes that could not be concealed if I reinstall the old t-stat years down the road."

[image]


I covered the original holes with foil tape, but anything will work. I just wanted to cover them to eliminate air intrusion from behind the t-stat.

[image]

deltabravo

Spokane, WA

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Posted: 05/12/10 10:14pm Link  |  Print  |  Notify Moderator

I shoved some foam in the hole as I stuff the wires back in to the wall:

[image]


Mounted the base plate:

[image]


Pop the main unit on to the base plate and secure the screw to keep it in place.

Control buttons are on the right side - there's master switch that turns the heat on or off, and a fan control switch that does nothing since we aren't controlling an A/C unit.

The master switch also has a "cool" position, but again, since the truck campers don't have A/C controlled by the t-stat, all we use in campers will be the "heat" function.

It is a "programmable" t-stat, so you can set heat to various temps during the day (wake, leave, return, sleep"

[image]


Done:
Display shows room temp and time of day. When you press an up or down button, then it will show the "set point".

[image]

time2roll

Southern California

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Posted: 05/12/10 10:18pm Link  |  Print  |  Notify Moderator

Cool job [emoticon] I mean it shows 58 so get the heat on already [emoticon]


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deltabravo

Spokane, WA

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Posted: 05/12/10 10:27pm Link  |  Print  |  Notify Moderator

Admins/Mods, could you link this in the TCU?

Steve_in_29

29 Palms (SEMPER FI), CA 92277

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Posted: 05/12/10 11:00pm Link  |  Print  |  Notify Moderator

Nice job.


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sdavis622

Puyallup, WA

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Posted: 05/12/10 11:07pm Link  |  Print  |  Notify Moderator

Very nice! Good work.


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capeangler

Massachussetts

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Posted: 05/13/10 05:49am Link  |  Print  |  Notify Moderator

nice job and great tutorial . thanks for sharing ,
I will be doing this to mine for sure
thanks again


Thanks
capeangler
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capeangler

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Posted: 05/17/10 04:15pm Link  |  Print  |  Notify Moderator

capeangler wrote:

nice job and great tutorial . thanks for sharing ,
I will be doing this to mine for sure
thanks again


Just did my upgrade with the same unit that you purchased. Love the new look and I can actually see the settings with out having to find my glasses. Plus I have a nice clock now [emoticon]
Interesting thing is my existing t-stat only had 2 wires ? What was the big black wire for? Do you think I need it? ,, I tested the system and all seems okay .


Thanks

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