Preferred Instruments
Div. of Preferred Utilities Manufacturing Corp
.
Phone (203) 743-6741, Fax (203) 798-7313
www.preferredinstruments.com
Installation and Operation Manual JC-22-PL2-1006 rev. 6 6-5-17
Page 10 of 12
E. FIELD ADJUSTMENTS
Place the control into “AUTO” Mode after wiring to code and installing the piping
and linkage. Turn power on only after the burner manufacture instructions are
understood and executed.
After main flame has been established in modulation mode, set the following
adjustments:
1.
Setpoint:
Turn set point adjustment to the optimum position.
The factory set range (0” to -2” or 0” to +2”) is indicated on the
label near the adjustment pots.
The range can be changed by following the directions on page 12.
2.
Damping:
Turn clockwise to reduce actuator hunting caused by
flame induced pressure pulsations.
3.
Dead-Band:
Establishes a zone above and below the set point,
within which the actuator does not move.
Turn the dial clockwise to increase the dead band.
Turn the dial counterclockwise to decrease the dead band.
Adjustment range is +-.01to .08” w.c.
4.
Proportional Band:
Adjusts the amount of pressure deviation from
set-point required to cause the actuator to move at full speed.
Pressure deviations smaller than the proportional band cause the
actuator to move more slowly, in proportion to the deviation from
setpoint.
