AB
Figure 1-1 Pilot Assembly, Flame Adjustment
a.This test requires a DC millivolt meter set to a scale of 0-1000mv. Using test leads with sharp probes will help in taking the required reading.
b.Locate the thermopile wires coming from the thermostat/limit box going to the gas valve. The wire insulation size decreases near the gas valve connections.
c.Using the positive (+) test probe, connect the probe to High Limit wire terminal. On UFM systems pierce High Limit wire insulation at the gas valve safety magnet connection.
d.Connect the negative (-) test probe to pilot tubing.
e.Remove the pilot flame adjustment cover.
f.Turning the flame adjusting screw clockwise lowers the flame and the millivolt output. Turning the screw counterclockwise increases flame size and millivolt output.
g.Rotate the screw in the direction to achieve a reading of 400 ±50 mv.
NOTICE