P70, P72, and P170 Series Controls for Low Pressure Applications Installation Instructions
7
Limited Knob Adjustment
Some models are supplied with a Limited Knob
Adjustment Kit which limits adjustments to the pressure
control and helps to deter over-adjustment or
tampering.
To lock the differential setting and allow limited
adjustment of the low event and high event setpoints,
install the knob on the range screw.
To lock the high event setpoint and allow limited
adjustment of the low event setpoint (on All-Range
controls) or differential setting (on MICRO-SET®
controls), install the knob on the differential screw.
To install the Limited Knob Adjustment Kit:
1.
Adjust control pointers to desired high event and
low event setpoints (on All-Range controls) or
differential setting (on MICRO-SET® controls).
2.
Place spacer on the proper adjustment screw.
•
All-Range controls (with Limited Knob
Adjustment Kit) have round and knurled
adjustment screws; the spacer must always be
placed on the range screw.
•
MICRO-SET® controls have square
adjustment screws. Always place the spacer
on the same adjustment screw as the knob.
3.
Place the indicator plate, as shown in Figure 9, to
lock either the range screw or differential screw in
the desired setting.
4.
Install the knob on the other adjustment screw and
tighten the setscrew. A stop on the bottom of the
knob limits screw adjustment to less than one turn.
Figure 8: Adjusting P70, P72, and P170 Controls for Low Pressure Applications
Figure 9: Installing Limited Knob Adjustment Kit
