B. Install the Heat Valve
DA 40 Series
Detail Steps/Work Items Key Items/References
(1) Put the heat valve in position on the firewall.
(2) Install the 5 washers and bolts which attach the valve to the firewall.
(3) Set the CABIN HEAT control lever to ON. Then move it up about 3 mm (0.1 in).
(4) Attach the control cable: S Put the control cable through the hole in the swivel fitting. S Make sure that the flap is hard against the bottom of the valve. S Tighten the screw in the swivel fitting.
(5) Do a test for correct operation of the heat valve. Refer to Paragraph 3.
(6) Connect the flexible hose to the heat valve. Tighten the worm drive clamp.
(7) Install the engine cowlings. Refer to Section 71-10.
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AMM
3. Test/Adjust the Heat Valve
WARNING: MAKE SURE THAT THE FLAP ON THE HEAT VALVE FULLY CLOSES THE FIREWALL OUTLET WHEN YOU SET THE CABIN HEAT CONTROL LEVER TO OFF. THIS IS TO STOP FIRE OR EXHAUST FUMES FROM GOING INTO THE COCKPIT IN AN EMERGENCY.
Detail Steps/Work Items Key Items/References
(1) Remove the engine cowlings. Refer to Section 71-10.
(2) Set the CABIN HEAT control lever in the cockpit to OFF. There must be 'bounce' of about 3 mm (0.1 in) between the back of the lever and the cockpit stop.
WARNING: IF THE ENGINE HAS BEEN RUNNING, TAKE CARE WHEN YOU TOUCH THE HEAT VALVE. THE HEAT VALVE GETS HOT.
(3) Release the worm-drive-clamps which holds the flexible hose to the heat valve and then disconnect the hose from the heat valve. Refer to Figure 3.
(4) Make sure that the flap fully closes the outlet to the distributor valve. Access through the front of the valve.
(5) If necessary, adjust the control cable in the swivel fitting to give the correct bounce: S Set the CABIN HEAT control lever to ON. S Loosen the screw in the swivel fitting. S Move the flap a small distance. S Tighten the screw in the swivel fitting. Access through the front of the valve. If there is no bounce, move the flap up. If there is too much bounce, move the flap down.
(6) Set the CABIN HEAT control lever in the cockpit to OFF. There must be 'bounce' of about 3 mm (0.1 in) between the back of the lever and the cockpit stop.
(7) Do items 5 and 6 as necessary to get the correct adjustment.
(8) Connect the flexible hose to the heat valve and tighten the worm-drive-clamps.
(9) Install the engine cowlings. Refer to Section 71-10.
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Air Conditioning
AMM
4. Remove/Install the Distributor Valve
Refer to Figure 3.
A. Remove the Distributor Valve
Detail Steps/Work Items Key Items/References
(1) Remove the engine cowlings. Refer to Section 71-10.
(2) Disconnect the battery. Refer to Section 24-31.
(3) Remove the instrument panel cover. Refer to Section 25-10.
(4) Remove the pilots' seats. Refer to Section 25-10.
(5) Disconnect the 2 hot air hoses from the passengers' footwells. Cut the cable binders.
(6) Remove the heat valve. Refer to Paragraph 2.
(7) Loosen the screw which holds the control cable to the swivel fitting in the distributor valve. Access through the front of the valve.
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