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Cable Lock-Nut
Distributor Valve
Control Cable
Hot Air Hose from Heat Exchanger
Cable Binder
Hot Air Hose
to Passenger
Footwells
Heat Exchanger
To/From Engine Cooling System
Heat Valve
Attaching Bolt
(Bonded in)
Heat Valve Attaching
Nut and Washer
Figure 3: Heat Valve and Distributor Valve Installation.
AIRCRAFT
DA 40 Series
AMM
Air Conditioning
Doc # 6.02.01
Rev. 5 21-01-00 Page 203
20 Sep 2007
B. Install the Heat Valve
Detail Steps/Work Items Key Items/References
(1) Examine the copper seal between the distributor
valve and the firewall.
Replace defective seal. Use selfadhesive
copper tape.
(2) Put the heat valve in position on the firewall. Apply fire resistant sealant. Use PR 812
or equivalent.
(3) Install the 4 washers and nuts which attach the
heat valve to the firewall.
(4) Set the CABIN HEAT control lever to ON. Then
move it up about 3 mm (1/8 in).
(5) 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
right side of the valve.
S Tighten the screw in the swivel fitting.
(6) Do a test for correct operation of the heat valve. Refer to Paragraph 3.
(7) Connect the flexible hose to the heat valve.
Tighten the worm drive clamp.
(8) Install the engine cowlings. Refer to Section 71-11.
AIRCRAFT
Air Conditioning DA 40 Series
AMM
Page 204
20 Sep 2007 21-01-00 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 71-11.
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 and then
disconnect the hose from the heat valve.
Refer to Figure 3.
(3) Set the CABIN HEAT control lever in the cockpit
to ON.
The flap should be hard against the
right wall of the valve.
(4) Set the CABIN HEAT control lever in the cockpit
to OFF.
There should be 'bounce' of about
3 mm (1/8 in) between the back of the
lever and the cockpit stop.
(5) Make sure that the flap fully closes the outlet to
the distributor valve.
Access through the front of the valve.
(6) 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 to adjust it.
S Tighten the screw in the swivel fitting.
Access through the front of the valve.
If there is no bounce, move the flap to
the left. If there is too much bounce,
move the flap to the right.
(7) Set the CABIN HEAT control lever in the cockpit
to OFF.
There should be 'bounce' of about
3 mm (1/8 in) between the back of the
lever and the cockpit stop.
(8) Do items 6 and 7 as necessary to get the correct
adjustment.
(9) Connect the flexible hose to the heat valve and
tighten the worm-drive-clamps.
(10) Install the engine cowlings. Refer to Section 71-11.
AIRCRAFT
DA 40 Series
AMM
Air Conditioning
Doc # 6.02.01
Rev. 5 21-01-00 Page 205
20 Sep 2007
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 71-11.
(2) Disconnect the battery. Refer to Section 24-34.
(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) Remove the 2 screws which attach the distributor
valve to the side walls of the floor panel.
In the cockpit.
(8) Remove the copper seal between the distributor
valve and the firewall.
(9) Move the valve forward through the firewall. To give access to the rear of the valve.
(10) Remove the bottom locknut from the control
cable for the heat valve.
Where the cable outer sheath attaches
to the distributor valve.
(11) Move the heat valve control cable clear of the
distributor valve.
　
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