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Rob's REBVAIR Project
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Date:  5-26-2015
Number of Hours:  4.00
Manual Reference:  
Brief Description:  Cabin heat control

Here are some details regarding the cabin heat box and control. The box itself is the stainless model from ACS that includes the SCAT hose flange protruding into the cabin, and the control linkage on the firewall side. I opted for this more expensive version because I really wanted the control routed on the firewall side. I simply saw no room on the cabin side for a cable from the panel to near-the-floor. Secondly, this version has the flange on the cabin side, which greatly simplifies the attachment of a diffuser (Image 3). This is just some 0.032"scrap I bent-up and is held on to the flange with a stainless hose-clamp. It's modeled after something I saw somewhere. The 'wings' re-direct the hot air sideways so it doesn't just 'blast' straight out at the passenger's feet.

Image 1 shows the box's position on the Rebel firewall, strategically located to be able to accept a short length of SCAT hose that runs from the heat muff that will sit on the right-side exhaust (you can see one of the two 'ends' of this muff on the lower right side of the photo. I'll literally only need about 12" of hose to connect the two.

On the cabin-side, I have a fairly 'fancy' McFarlane control that regulates the flapper opening, and hopefully metering the amount of heat entering the cabin. The throw of the control is only about 1.5", so it may be more of an 'on-off' switch, rather than a fine-tuning of the temperature.

I installed nutplates on the cabin-side backing plate, so it can be replaced fairly easily (let's hope that never has to be the case).
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position on firewall

position on firewall

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cable attach

cable attach

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cabin-side diffuser

cabin-side diffuser

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