Figure 14. Flame scanner.

Checking the flame scanner (Fig. 14)

1. Make sure that the HEATER CONTROL switch (Fig. 5) is set to OFF.

   

2. Turn on power to the control panel while the front panel is open.

3. With no flame present, check for 560 Vac between terminals S1 and S2 using an ac voltmeter.

4. Remove the flame scanner.

5. Create a flame using a cigarette lighter, a torch or a match. Hold the flame in front of the scanner eye. The voltage should drop to about 340 Vac and the Fireye Flame monitor should show the message FALSE FLAME and should indicate a signal number. Otherwise, either the flame scanner or its amplifier is defective.

Adjusting pilot gas pressure regulator
(Fig. 10)

1. Connect a manometer to the tee of the pilot gas line where it enters the burner.

2. Open the control panel and gain access to the flame monitor.

3. Turn on power to the control panel while the front panel is open.

4. Set HEATER CONTROL switch to ON and let the heater start through its purge cycle.

5. Without delay, remove red cover from Fireye flame monitor. Wait for the flame monitor to display the words IGNITION TIMING. Quickly place the switch on Flame monitor programmer marked CHECK/RUN to the position marked CHECK. This will hold the timing sequence while you adjust the regulator.

6. Adjust screw on regulator so that manometer indicates 3-inches W.C. or as specified for your burner in the burner manual.

7. Place flame monitor switch back to RUN. The timing sequence should continue and operation should be normal.

Cleaning the helical coil

1. Make sure that the HEATER CONTROL switch (Fig. 5) is set to OFF and the heater has cooled down.

2. Turn off main circuit breaker (Fig. 12) and lock it off.

3. Remove the heater end cover plate (C, Fig. 9) from the end of the heater opposite the burner.

4. Use compressed air to blow soot off all exposed surfaces of the coil, including surfaces next to the insulation on the walls of the heater shell. Be careful not to damage insulation inside the shell.

   Note: To accomplish this you will need a long pipe connected to the end of your compressed air hose. The pipe should have a series of holes along its length. The end of the pipe must be plugged.

5. Vacuum out the soot from inside the helical coil.

6. Replace the end plate.