Overview of Primary Product

TEST PROCEDURES

INTRODUCTION

This section describes the test procedures that must be performed after installation to insure that the

Multi-Burner Control is operating properly; these procedures are mandatory.

LIMITS AND INTERLOCK TESTS

Periodically check all interlock and limit switches by manually tripping them during burner opera-

tion to make sure they cause the system to shut down.

— The burner at which a flame fails will be identified by a red “Flame Failure” LED on the corre-

sponding MB-600PF flame sensing module.

FLAME SIGNAL STRENGTH

Insert the positive probe of a 0-15 VDC, one megohm/volt

(minimum) meter into the test point on the MB-600PF as

applicable, shown in the photo at left. Connect the negative

probe to ground. A good flame signal strength will read

between 6 and 11 VDC; anything below 4 VDC is inadequate.

MINIMUM PILOT TEST

Run the following test procedures to ensure that the sensor

will not detect a pilot flame too small to reliably light the main

flame:

1.Manually shut off the fuel supply to the burner, but not to the

pilot.

2.Start the system normally.

3.To enter the pilot test mode, press the RESET and ENTER

buttons simultaneously. Then release the RESET button but

keep the ENTER button depressed for another 10 seconds. The

Limits LED will blink, signaling that the system is in the pilot

test mode.

4. The control will hold the operating sequence at the pilot flame step. Measure signal strength as

described above.

5. Reduce pilot fuel until the flame relay drops out. Increase pilot fuel until the flame signal is

greater than 4 VDC, and flame relay just manages to pull in. This is the minimum pilot. If you

don’t think this flame will be able to safely light the main burner, realign the sensor so that it

requires a larger pilot flame and repeat steps 2 through 5.

6. Push the RESET button to exit the test mode and begin the normal start-up sequence again.

7. When the sequence reaches the main flame trial for ignition, smoothly restore the fuel supply to

the burner. If the main burner does not light within five seconds, immediately shut off the burner

supply to shut down the system. Realign the sensor so that it requires a larger pilot flame. Repeat

steps 1 through 6 until the main burner lights off smoothly and reliably.

WARNING: Never operate a system that is improperly adjusted or has faulty interlocks or

limit switches. Always replace faulty equipment with new equipment before resuming oper-

ation. Operating a system with defective safety equipment can cause explosions, injuries,

and property damage.

FIGURE 7.

Voltmeter Hookup to Measure