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2.  Cleaning and Inspection:
A.  Brush off any dust or lint from the switch operating mechanism (exposed inside the duct) and wipe the external surfaces with a clean cloth.
3.  Installation:
A.  Insert the switch carefully with gasket (if used) into the ventilating duct opening and secure with the two attaching screws and washers.
B.  Connect the two electrical leads to their respective terminals on the face of the switch as marked during removal.
C.  Operate the heater with the duct switch set above ambient temperature to check operation.
21-40-00 Page 21-37 Revised: February 28, 2002
OVERHAUL INSTRUCTIONS.
The heater assembly shall be overhauled after 1000 hours or whenever the pressure decay test requirement cannot be met. The heater should be removed from the aircraft disassembled, all parts thoroughly inspected and necessary repairs and/or replacements made prior to reassembly.  Detailed step-by-step instructions are included for a complete heater overhaul.  In some instances, however, inspection may reveal that it is unnecessary to remove certain parts.  If so, those portions of the overhaul procedures may be eliminated.
DISASSEMBLY OF HEATER. (Refer to Figure 21-18)
1.  
Remove the screw and slide the elbow adapter off the combustion air inlet tube.

2.  
Disconnect and remove electrical wiring and individual wires from the various components on the heater. If wires appear to be in good condition, it may be desirable to remove wire harness assembly intact.  First disconnect wires at terminal strip and components.

— Note —
It is advisable to label all wires, prior to removal, to insure correct connections during reassembly.  Cable straps and clips must be replaced if removed, as they cannot be reused.
3.  
Carefully disconnect the high voltage ignition lead at the spark plug.  Handle the spring connector on the end of this lead with care to prevent fouling or damage.

4.  
Remove the four screws and cable straps to free the ignition assembly from the heater jacket and remove the ignition assembly. The vibrator may be removed by releasing the clamp and exerting a firm pull straightaway from the ignition assembly case.

5.  
Remove the grommet from the jacket and remove the spark plug with a 7/8 inch deep socket.  Make sure the spark plug gasket is removed.

6.  
Remove the two screws and lift out the overheat (limit) switch and spacer gaskets.

7.  
Remove the two screws and lift out the cycling switch.

8.  
Remove the four screws to release the terminal strip and insulator from the jacket.

9.  
Disconnect the tube fitting at the cover of the combustion air pressure switch. Take precaution when bending tube. Unscrew and remove the combustion air pressure switch from the combustion air inlet tube.

10.
Remove vent air inlet adapter from the blower housing by removing the three screws.

11.
Loosen the four screws and rotate the blower and motor housing to disengage the notched end from the four screws in the end of the heater jacket.  Disconnect the motor wiring quick-disconnect.

12.
Remove the upper fuel shroud box cover by removing the screws.

13.
Remove the grommet from the fuel shroud and carefully pull the fuel solenoid wires through the hole in the shroud.

14.
With an open end wrench, remove the fuel solenoid assembly being careful not to damage the wires on the solenoid.

21-40-00 Page 21-38 Revised: February 28, 2002
1I12
15.
Reach inside the inlet end of the jacket assembly with a 3/4 inch open-end wrench, and while holding the fuel-tube fitting at the jacket, use a 3/4 inch deep socket to remove the elbow, nut, washer, gasket and fuel shroud.

16.
Remove the two screws and carefully withdraw the nozzle holder from the combustion head assembly, remove gasket.

17.
Remove the six screws and withdraw the combustion head assembly from the combustion tube assembly. Remove gasket.

18.
Remove the screws and remaining cable straps, if not previously removed, from the seam of the jacket assembly.  Note the position of the cable straps as they are removed.  Spread the jacket at the seam and remove it from the combustion tube assembly.  This will free the asbestos gasket which can be removed from the particular part to which it remains attached.

19.
Carefully unscrew and remove the spray nozzle from the nozzle holder.  Remove the gasket.

— CAUTION —
HANDLE THE NOZZLE WITH CARE TO AVOID DAMAGE TO THE TIP. THE MATERIAL AROUND THE ORIFICE IS VERY THIN AND ANY SHARP BLOW ON THE FACE OF THE NOZZLE CAN DISTORT THE SPRAY PATTERN AND CAUSE IRREGULAR IGNITION OR IMPROPER COMBUSTION.
　
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