Johnson Controls P70 Serie Instrucciones De Instalación página 5

Figure 8: Adjusting P70, P72, and P170 Controls for Low Pressure Applications
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.
P70, P72, and P170 Series Controls for Low Pressure Applications Installation Instructions
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.
Adjustment Knob with Set Screw
Indicator Plate
Range Screw
Range Screw
Differential Screw
Installation of Knob Kit to
Lock Differential Screw and
Allow Limited Adjustment of
Range Screw
*On MICRO-SET controls, place spacer on same adjustment
screw as knob.
On All-Range controls, always place spacer on range screw.
Figure 9: Installing Limited Knob Adjustment Kit
Spacer*
Installation of Knob Kit to
Lock Range Screw, and
Allow Limited Adjustment of
Differential Screw
5