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TROUBLE-SHOOTING...............................................................................................................101
1. General .........................................................................................................................101
MAINTENANCE PRACTICES ....................................................................................................201
1. General .........................................................................................................................201
2. Remove/Install the Heat Control Valve.........................................................................201
3. Test/Adjust the Heat Control Valve ..............................................................................203
4. Remove/Install The Distribution Box ............................................................................204
5. Test/Adjust The Distribution Box Valve ........................................................................208
6. Remove/Install the Heat Exchanger Shroud ................................................................211
7. Inspect the Heat Exchanger .........................................................................................213
Heating and Ventilation
DA20-C1 AMM
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19 Dec 1997 21-CONTENTS Doc # DA 201-C1
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DA20-C1 AMM
Heating and Ventilation
Doc # DA 201-C1
Rev. 0 21-00-00 Page 1
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CHAPTER 21-00
HEATING AND VENTILATION - GENERAL
1. General
The DA20-C1 has separate systems to supply hot air and cold air. The hot air system can supply
air from ambient temperature to warm. The system supplies the footwells or the windscreen. The
cold air system can supply ambient air to adjustable vents at each side of the instrument panel.
Cold air also cools the avionic equipment in the instrument panel.
2. Description and Operation
Figure 1 shows the heating and ventilation system schematic diagram.
A. Cabin Heat System
The cabin heat system has these components:
− An air intake at the front of the bottom cowling.
− A heat-exchanger. A shroud around the exhaust muffler makes the heat exchanger. The
shroud has an air inlet connection at the front on the right. It also has a warm air outlet
connection at the back on the left.
− A heat control valve. The heat control valve attaches to the front face of the firewall at the
bottom. The cabin heat valve has two outlets. One outlet lets hot air flow into the engine
compartment. The other outlet lets the hot air flow through the firewall into the distribution
box.
A flap in the heat control valve controls the flow of warm air to the outlets. It closes one
outlet as it opens the other outlet.
− A distribution box. The distribution box attaches to the sides of the center console at the
front. The distribution box has four outlets. Two outlets let hot air flow to the canopy
windscreen. And the other two outlets let hot air flow to the floor at each side of the
center console.
A flap in the distribution box controls the flow of warm air to the outlets. It closes two of
the outlets as it opens the other two outlets.
Heating and Ventilation
DA20-C1 AMM
Page 2
19 Dec 1997 21-00-00 Doc # DA 201-C1
Rev. 0
Figure 1: Heating and Ventilation Schematic Diagram
DA20-C1 AMM
Heating and Ventilation
Doc # DA 201-C1
Rev. 0 21-00-00 Page 3
19 Dec 1997
− A CABIN HEAT control lever at the front of the center console. A bowden cable connects
the lever to the flap of the heat control valve.
− A DEFROST/FLOOR control lever at the front of the center console. A bowden cable
connects the lever to the distribution control valve.
Ambient air goes into the engine compartment through the intake at the front of the bottom
cowling. A large flexible hose connects the intake to the front of the heat exchanger. The hot
exhaust muffler makes the air hot. The air flows out of the heat-exchanger through a large
flexible hose to the heat control valve.
The CABIN HEAT control lever moves the flap in the heat control valve. In the OFF position
(fully forward) no hot air can flow into the cockpit. Move the lever aft (towards the ON position)
to let gradually more hot air flow into the cabin.
The DEFROST/FLOOR control lever moves the flap in the distribution box. In the DEFROST
position (fully forward) the hot air flows to the windscreen. Move the lever aft (towards the
FLOOR position) to let the hot air flow to the floor.
B. Cold Air System
Ambient air enters the cockpit through a NACA duct on each side of the forward fuselage.
Flexible hoses connect the ducts to ventilation nozzles on each side of the instrument panel.
　
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