36
When using a flame rectification amplifier, a micro-ammeter may be connected in series with the
wire to Terminal S2. Normal flame will produce a meter reading between 4 and 10 micro-amps.
With the test meter on the AC scale, line and load voltages may be measured at the identified test
points on the chassis.
Normal Pilot Flame Test (Programmers with Run/Check Switch)
1.
At pilot trial for ignition (PTFI) place the Run/Check switch in the Check position.
2.
During the pilot flame test and adjustment period, if flame is not detected within 30 seconds, the
control will lock out and require manual reset to initiate another cycle.
3.
Observe the pilot flame signal on the test meter or the ED510 display. If the flame signal is
below 4.0 volts DC or a reading of 10 on a remote display, re-adjust the pilot flame or realign
the flame detector.
4.
When using UV detection, a test is required to verify that UV radiation from the ignition spark
is not being detected. To accomplish this, manually shut off both the pilot and main fuels. Initi-
ate a normal start-up. Observe the test meter which should read no more than 1/2 volt DC. If
higher levels are observed, realign the UV scanner, and/or shield the spark from the scanner’s
view.
5.
Move the Run/Check switch to the Run position, check pilot flame response time by manually
shutting off the pilot fuel and initiate a normal start-up. With no pilot flame present, the control
will de-energize the pilot assembly at the end of the trial for ignition interval (selectable by dip-
switch #4) and go into safety shutdown.
Minimum Pilot Test
This test assures that the flame detector will not sense a pilot flame too small to light a the main
flame reliably. It must be made on every new installation as well as following the repositioning or
replacement of the flame detector. This procedure should not be used on a direct spark burner.
1.
Manually shut off the fuel to the main burner.
2.
Place the Run/Check switch in the Check position. (MEP500 Series Programmers only).
3.
Connect a test meter to the test jacks on the Amplifier Module or observe the reading on the
ED510 display.
4.
Initiate a normal start-up.
5.
Reduce the fuel to the pilot until the DC voltmeter reads 4.0 volts. This is the minimum pilot.
For flame rectification the flame signal for minimum pilot varies depending on the application.
See WARNING below.
6.
Return the Run/Check switch to the Run position (MEP500 Series Programmers only).
7.
Slowly turn on the main fuel and insure the main flame lights off promptly and normally.
Flame Failure Test
1.
Temporarily connect spark ignition and pilot to Terminal #3.
2.
Initiate a normal start-up.
WARNING: Before making a pilot flame test, manually shut off the fuel supply to the main
burner.
WARNING: DO NOT TOUCH a flame rectification rod with power applied.
WARNING: The minimum pilot test must be accomplished by a trained and qualified
burner technician.
WARNING: If light off is delayed, shut off the power to the installation. Realign the flame
detector so a larger pilot flame is required before flame is detected. Repeat this test until
the main flame lights reliably with minimum pilot.
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