Diamond Aircraft DV 20 E 2022, Airplane Maintenance Manual

Page: 206 / 903

AIRCRAFT
Heating and Ventilation
DV 20 E AMM
Page 2
15 Mar 2022
21-00-00
Doc # 4.02.25
Rev. 2
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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.
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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
and the coolant radiator. 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. Each nozzle
can adjust to point the airflow as necessary. Turning the nozzle flap controls the amount of air
flowing into the cockpit.