Diamond Aircraft DV 20 E 2022, Airplane Maintenance Manual

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AIRCRAFT
DV 20 E AMM Heating and Ventilation
Doc # 4.02.25
Rev. 2
21-00-00
Page 1
15 Mar 2022
CHAPTER 21
HEATING AND VENTILATION
1. General
The DV 20 E airplane 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 the following components:
)
An air intake at the front of the bottom cowling.
)
A coolant radiator. A part of the air that goes through the coolant radiator is guided into the
cabin heat system.
)
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.