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% Section 21-01 % Air Conditioning - TAE 125 Diesel Engine % 1. General
% This Section gives you the system description and operation of the air conditioning system for % airplanes with the TAE 125 Diesel engine installed. It also gives the trouble-shooting. Refer to Section % 75-01 for more maintenance data on the coolant heat-exchanger.
% 2. Description and Operation
% The DA 40 with the TAE engine installed has 2 separate systems for heating and cooling/ventilating % the cockpit. Figure 1 shows the heating system. Figure 2 shows the cooling and ventilation system.
% A. Cabin Heating
% Cold ambient air enters the system through an intake at the front right of the engine cowling. The % air flows through a duct to a heat-exchanger.
% The heat exchanger attaches to the lower right part of the engine mount. Two pipes connect the % heat exchanger to the engine cooling system. Hot coolant from the engine cooling system goes % to and from the heat exchanger through these pipes.
% Heat from the coolant makes the air hot. A glass-fiber shroud round the air outlet from the heat % exchanger connects to an outlet hose. The hose connects to the heat valve on the forward face % of the firewall.
% A flap inside the heat valve can connect the heat valve outlet to atmosphere or to a distributor % valve on the rear face of the firewall. A lever in the cockpit controls the flap. The lever is marked % ‘CABIN HEAT, ON OFF’.
% The distributor valve also has a flap. The flap can connect the valve inlet to the pilot and % passenger floor areas or the front of the canopy. A lever in the cockpit controls the flap. The lever % is marked ‘DEFROST - FLOOR'.
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Control Flap
in Distributor Valve
STATUS: STATUS:
Cabin Heat ON. Cabin Heat OFF.
Distributor Control ValveDistribution Control Lever in
in Mid Position. Defrost (
) Position (Between
and
)
% Figure 1: Cabin Heat Schematic Diagram %
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% If the heat valve is set to OFF, the flap sends the air overboard at the bottom of the engine % cowling. If it is set to ON, the hot air goes through the firewall to the distributor valve. The valve % can be set to any position between OFF and ON. If the valve is set to a middle position, only part % of the airflow goes to the distributor valve.
% If the distributor valve is set to FLOOR, air flows to the pilots' and passengers' footwells. If it is set % to DEFROST, the air flows to the front of the canopy. This prevents mist or frost from forming on % the canopy. The valve can be set to any position between FLOOR and DEFROST. If the valve is % set to a middle position, part of the airflow goes to the footwells and part to the canopy.
% B. Cooling and Ventilation
% Figure 2 shows the cooling and ventilation system.
% (1) Pilots' Cabin Air
% Air enters the system at two NACA air inlets in the front fuselage on the left and right side. % Hoses connect the air inlets to two adjustable outlets in the bottom instrument panel.
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