TM 5-4520-241-14
KEY to fig. 5-6:
1.
Nut
15.
Frame cap
2.
Lock washer
16.
Loading spring
3.
Suppression capacitor
17.
Nut
4.
Motor housing
18.
Washer
5.
Wire
19.
Armature
6.
Wire
20.
Field
7.
Thermal cutout
21.
Ball bearing
8.
Connector
22.
Housing frame assembly
9.
Ty-rap
23.
Spacer
10.
Screw
24.
Fan assembly
11.
Clamp
25.
Spacer spool
12.
Brush assembly
26.
Upper chamber
13.
Screw
27.
Fan assembly
14.
Ground strap
28.
Lower chamber
Table 5-1. Direct Support and General Support Troubleshooting - Continued
MALFUNCTION
TESTING OR INSPECTION
CORRECTIVE ACTION
4.
HEATER FAILS TO IGNITE, BUT RED INDICATOR LIGHT DOES NOT COME ON.
Step 1.
Check time delay transformer output. Disconnect power plug. Remove the control box and
disconnect male plug. Install a jumper from pin 1 to pin 6 in the female receptacle in the heater
case. Open access doors and disconnect the brown lead to the flame switch at terminal strip
terminal G. Connect the power plug and measure voltage at pins 2 and 3 of the female receptacle.
Voltage should be 23 to 30 VAC.
If there is no voltage, or incorrect voltage, replace the time delay transformer assembly.
Disconnect the power plug. Disconnect the 4 leads at the time delay transformer (below the
terminal strip near the carburetor). Remove the screws and washers which secure the
transformer to the heater case, and remove the transformer. Install a new transformer and
secure to the heater case with screws and washers. Connect the four leads and recheck
operation. If this corrects the problem, reconnect the brown wire to terminal strip terminal G.
5-14
