TM 9-2320-209-34-2-3 (3) Burn test. FRAME 1 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Be sure control switch (1) is in OFF position. Flip HI-LO switch (2) to HI. Start timing and hold control switch (1) in START position. Heater (3) should start in 40 seconds. Flip control switch (1) to RUN. If heater (3) does not start, replace igniter. Refer to para 21-6c, and para 21-6e. Look inside heater (3) for fuel leaks. If leaks are found, stop testing. Repair leak, refer to para 21-6c, para 21-6d, and para 21-6e. Flame detector switch should transfer in 200 seconds. Pilot lamp (4) will glow when transfer takes place. If transfer does not take place, adjust or get new flame detector switch. Re- fer to para 21-6c, 21-6d, and 21-6e. Let heater (3) burn on HI heat for about a minute. Flip HI-LO switch (2) to LO. Burning should be less and blower motor should run slower. If heater (3) goes out, a new fuel control valve must be put on. Refer to para 21-6c and 21-6d. Then do this frame again. Flip control switch (1) to OFF position. Fuel flow should stop; burning should stop in 30 seconds. Blower should still run for more than one minute, but less than three minutes. Blower should stop all by itself. If blower does not run as in step 9, do step 6. END OF TASK 21-11