3. DESCRIPTION
A. Heat exchanger (Figure 2)
The heat exchanger, installed on the exhaust pipe, heats the air coming from the air intake located on the left, under the propeller spinner dome.
B. Cabin air mixer (Figure 3)
The cabin air mixer mixes the hot air coming from the heat exchanger with the cold air coming from the R.H. NACA air intake.
Hot air / cold air adjustment is ensured, for hot air, by a fire cut-off shutter integrated into the cabin air mixer, and, for cold air, by the R.H. NACA air intake shutter.
Both shutters are controlled from the cabin via a control panel located on the R.H. side of the instrument panel strip.
The cabin air mixer is located aft of the firewall, at front passenger feet level.
C. Control box (Figures 3 and 4)
The control box is equipped with three knobs which make it possible to adjust the flow and temperature of the air entering the cabin.
The knobs control the opening of the different shutters via sheathed control cables. The control box is located on the R.H. instrument panel strip.
D. Distribution hoses and diffusers (Figures 1 and 3)
Regulated air distribution is ensured by flexible, reinforced hoses.
For the demisting function, a diffuser is installed at the bottom of the windshield and supplied by a hose connected to the cabin air mixer.
For the heating function, a diffuser (supplied by a hose) is installed between the rear passengers, at floor level. A deflector is integrated into the cabin air mixer for the front passenger feet, and a hose is directed towards the pilot feet. Both hoses are connected to the cabin air mixer.
4. OPERATION
A. Air regulation (Figure 3)
The cabin air mixer is supplied with hot air coming from the heat exchanger and with cold air coming from the R.H. NACA air intake.
Regulation is obtained by moving the upper knob (hot air) and the central knob (cold air).
The air mixed in the cabin air mixer is distributed in the cabin to the pilot feet and the front and rear passengers feet.
The diffused air flow can be adjusted using the lower knob which controls a shutter inside the cabin air mixer.
B. Control box (Figures 3 and 4)
Hot air flow knob (A) controls the hot air flow coming from the cabin air mixer.
Cold air flow knob (B) controls the cold air flow coming from the R.H. NACA air intake.
Regulated air flow knob (C) controls the regulated air flow to the front and rear passengers (knob in R.H. position) and to the windshield (knob in L.H. position).
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本文链接地址：TB20 MAINTENANCE MANUAL 21 AIR CONDITIONING TB20飞机维护手册 21 空调(10)
