34
EXTERNAL METER CONNECTIONS
The test jacks are located on the amplifier card. If external access is desired for a panel meter the
shown below will assist you in locating the position to drill through on the front cover. The hole sizes
should be large enough to accommodate the body of the meter probes. The tests accept meter probes
up to .080” or 2mm diameter.
INSTALLATION TESTING
Use of Test Meter (All Controls)
Testing the Fireye MicroM Controls requires the use of a test AC/DC multimeter, with a minimum
1000 ohm/volt AC scale and 20,000 ohm/volt DC scale.
With the test meter on the DC scale, and the test meter leads inserted into the test jacks on the ampli-
fier (Red for positive (+) polarity, Black for minus (-) polarity), a DC voltage reading of 4.0 to 10
volts for all amplifier types should be obtained when the control is detecting flame and 0 volts when
no flame is present. Wildly fluctuating readings are an indication of an unstable flame or flame sensor
requiring maintenance. Inadequate flame signal may be improved by:
1.
Assuring that the flame detector and wiring installations have followed the instructions begin-
ning on page 47.
2.
Assuring that the flame detector is clean and within the ambient temperature limits.
3.
Assuring that the flame is sufficiently large to detect.
4.
Assuring that the flame quality (fuel to air ratio, combustion air velocity) is satisfactory.
5.
Trying a shorter sight pipe or increasing the sight pipe diameter. (The burner manufacturer
should be consulted before mechanical changes are made).
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.
µ
Μ
RECOMMEND
5/16” TO 3/8” HOLES
TO ACCOMODATE
METER PROBES
2.963
2 31/32
1.759
1 3/4
3.134
3 1/8
ADDING HOLES IN COVER TO ACCESS TEST JACKS
WARNING: Before making a pilot flame test, manually shut off the fuel supply to the main
burner.
