Johnson Controls P70 Mode D'emploi page 8

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djustments
Adjustment of the P70, P72, and P170 low-pressure
controls vary, depending on the model. The following
guidelines and diagrams illustrate the procedures for
adjusting these controls. Refer to the product label
inside the control cover for model number and switch
action, and check the front of the control cover to
determine if the control is All-Range or MICRO-SET.
(Refer to Table 1 for switch action, low event and high
event of the various control models.)
All-Range Controls
All-Range pressure controls have a scaleplate that
displays the CUT IN and CUT OUT setpoints. (See the
visible scale on control.) Turning the range screw
adjusts the CUT IN and CUT OUT setpoints up or
down simultaneously, while maintaining a constant
pressure differential. Turning the differential screw
adjusts only the low event on the left side of the scale,
and changes the pressure differential.
Figure 9: Adjusting P70, P72, and P170 Controls for Low Pressure Applications
P70, P72, and P170 Controls for Low Pressure Applications Product/Technical Bulletin
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MICRO-SET Controls
MICRO-SET low-side pressure controls have a
scaleplate that displays the CUT IN setpoint and
DIFFERENTIAL setting. (See visible scale on control.)
Turning the range screw adjusts the CUT IN setpoint
on the right side of the scale. Turning the differential
screw adjusts the DIFFERENTIAL setting on the left
side, which changes the resulting cut-out pressure.
IMPORTANT: Do not adjust pointers beyond
the highest or lowest indicator
marks on the control's pressure
scale. Adjusting pointers beyond
indicator marks may damage
screw threads and cause
inaccurate control operation.
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