Dual Pressure Controls (High Side) - Johnson Controls Serie Instrucciones De Instalación

Dual Pressure Controls (High Side)

The high side scaleplate of the P70, P72, and P170
dual pressure controls displays only the CUT OUT
setpoint. Turn the range screw to adjust the cutout
setpoint. The differential is fixed at about 65 psi.
For controls with Manual Reset Lockout option, see
Manual Reset Operation. For P70S and P170S
controls, see Convertible High Pressure Reset
Mechanism on P70S and P170S Controls.
To adjust the dual pressure controls:
1. Set the low side cut in setpoint by adjusting the low
side range screw.
All-Range Controls: Turn the screw clockwise to
raise the cut in setpoint.
MICRO-SET Controls: Turn the screw clockwise to
lower the cut in setpoint.
2. Adjust the differential screw.
All-Range Controls: Turn the screw clockwise to
raise the cut out setpoint.
MICRO-SET® Controls: Turn the screw clockwise
to increase the differential value.
3. Set the high side cutout setpoint by adjusting the
high side range screw. Turn the screw clockwise to
raise the cutout setpoint. (The high side differential
is fixed.)
8 P70, P72, and P170 Series Controls for Dual Pressure Applications Installation Instructions
4. Set the reset operation (on P70S and P170S
models only) for high side automatic reset or
manual reset lockout. See Convertible High
Pressure Reset Mechanism on P70S and P170S
Controls and Figure 9.
Figure 9: Adjusting the Dual Pressure Controls
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, may cause
inaccurate control operation, and will void the
warranty.
Manual Reset Operation
Pressure controls, with the Manual Reset option, lock
out when they reach the cutout pressure setpoint and
must be manually reset by the user to restart the
controlled equipment. The manual reset mechanism is
trip-free and cannot be overridden by blocking or tying
the reset button down.
On locked-out equipment, first determine and remedy
the cause of the lockout before proceeding.
• When lockout is caused by the control's low side
cutout, allow the sensed pressure to rise to the cut
in setpoint.
• When lockout is caused by the control's high side
cutout, allow the sensed pressure to drop at least
70 psig below the cutout setpoint.
After the sensed pressure has reached the desired
pressure, press and release the Reset button to restore
operation of the controlled equipment.