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Date:  5-3-2008
Number of Hours:  3.50
Manual Reference:  
Brief Description:  Heat Box

For a heat box, I chose an AviaComp International Tri-Box, which is lightweight, simple and all stainless steel. Unfortunately, I'm an advocate of the heat coming on when you pull on the heat control. As configured, the Tri-Box does the exact opposite, namely pulling on the heat control shuts the heat off. Accordingly, I fabricated a bellcrank to reverse the action using an existing nutplate hole. Inside the cabin, I expanded the inside of a 2 inch 6061 tube with an exhaust pipe expander so it would fit over the Tri-Box outlet and TIG welded a 1.25 inch 6061 tube at an angle so as to catch outlet air for a defroster. SCAT tubing will connect with a salvage Twin Comanche defroster valve to which I fit to some aluminum angle and which will bolt to the firewall with a pair of 10-32 screws. I'll figure out the defroster valve location after all the other firewall installations are done.
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Heat Box side view showing bellcrank.

Heat Box side view showing bellcrank.

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Heat Box outlet with defroster takeoff.

Heat Box outlet with defroster takeoff.

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Defroster valve top and bottom.

Defroster valve top and bottom.

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