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out of adjustment.
Distributor valve control cable
broken.
Adjust the distributor valve
control cable.
Replace the distributor valve
control cable.
No hot air flows to the
footwells.
Distributor valve control cable
out of adjustment.
Distributor valve control cable
broken.
Adjust the distributor valve
control cable.
Replace the distributor valve
control cable.
No cool air from 1 outlet. Other
outlets operate correctly.
Outlet defective. Replace the cool air outlet.
AIRCRAFT
Air Conditioning DA 40 Series
AMM
Page 102
20 Sep 2007 21-00-00 Doc # 6.02.01
Rev. 5
Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Air Conditioning
Doc # 6.02.01
Rev. 5 21-00-00 Page 201
20 Sep 2007
Maintenance Practices
1. General
This Section gives you the maintenance practices for the cabin heating system and tells you how to
replace outlets for the cooling system. Refer to Section 78-00 for maintenance data on the exhaust
muffler part of the heat-exchanger.
2. Remove/Install the Heat Valve
Refer to Figure 3.
A. Remove the Heat Valve
Detail Steps/Work Items Key Items/References
(1) Remove the engine cowlings. Refer to Section 71-10.
WARNING: IF THE ENGINE HAS BEEN RUNNING, TAKE CARE WHEN YOU
TOUCH THE HEAT VALVE. THE HEAT VALVE GETS HOT.
(2) Release the worm drive clamp which holds the
flexible hose to the heat valve. Then disconnect
the hose from the valve.
(3) Set the CABIN HEAT control lever to ON.
(4) Loosen the screw which holds the control cable
to the swivel fitting in the heat valve.
Access through the front of the valve.
(5) Remove 5 bolts and washers which attach the
heat valve to the firewall.
(6) Remove the heat valve from the firewall.
AIRCRAFT
Air Conditioning DA 40 Series
AMM
Page 202
20 Sep 2007 21-00-00 Doc # 6.02.01
Rev. 5
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Figure 3: Heat Valve and Distributor Valve Installation
AIRCRAFT
DA 40 Series
AMM
Air Conditioning
Doc # 6.02.01
Rev. 5 21-00-00 Page 203
20 Sep 2007
B. Install the Heat Valve
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.
AIRCRAFT
Air Conditioning DA 40 Series
AMM
Page 204
20 Sep 2007 21-00-00 Doc # 6.02.01
Rev. 5
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
　
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