Product Overview

10 P—
P470 Electronic Pressure Control with Display Product/Technical Bulletin
e. (Refer to Figure 12.)
If the control is
operating as an open-high control and:
The LED is Off.
Increase cutout setpoint
above the displayed pressure by the minimum
differential pressure (for the selected operating
pressure range) plus 10 psi. Then increase the
cut-in setpoint above the displayed pressure
by 5 psi. The LED should go On (and the N.O.
contacts close).
The LED is On.
Decrease cut-in setpoint
below the displayed pressure by the minimum
differential pressure plus (for the selected
operating pressure range) 10 psi. Then
decrease the cutout setpoint below displayed
pressure by 5 psi. The LED should go Off
(and the N.O. contacts open).
Maximum psi for
Selected Operating
Range
Displayed Pressure where
LED may be ON or OFF
Displayed Pressure where
LED should be ON
Displayed Pressure where
LED should be OFF
Cutout
Setpoint
Cut-in
Setpoint
Setpoint
Differential
Minimum psi for
Selected Operating
Range (0 or 50 psi)
Figure 12: LED Status for Open-high Controls
For example, if the control and transducer are
setup for a 0 to 100 psi pressure range with a
40 psi cut-in setpoint and a 50 psi cutout, and
the displayed pressure is 47 psi, the LED may
be On or Off. Adjust the cutout up to 62 psi (or
higher) and the cut-in up to 52 psi (or higher).
The LED should be On. Then adjust the cut-in
down to 32 psi (or lower) and the cutout down
to 42 psi (or lower). The LED should go Off.
This procedure, in effect, moves the
crosshatched areas shown on the graphs in
Figures 12 and 13 above or below the
displayed pressure, and forces the LED to go
On or Off (and output relay to close or open)
and verifies the control is functioning properly.
f. (Refer to Figure 13.)
If the control is
operating as an open-low control and:
The LED is Off.
Decrease cutout setpoint
below the displayed pressure by the minimum
differential pressure (for the selected operating
pressure range) plus 10 psi. Then decrease
the cut-in setpoint below the displayed
pressure by 5 psi. The LED should go On (and
the N.O. contacts close).
The LED is On.
Increase cut-in setpoint
above the displayed pressure by the minimum
differential pressure (for the selected operating
pressure range) plus 10 psi. Then increase the
cutout setpoint above displayed pressure by
5 psi. The LED should go Off (and the N.O.
contacts open).
Minimum psi for
Selected Operating
Range (0 or 50 psi)
Maximum psi for
Selected Operating
Range
Displayed Pressure where
LED may be ON or OFF
Displayed Pressure where
LED should be ON
Displayed Pressure where
LED should be OFF
Cutout
Setpoint
Cut-in
Setpoint
Setpoint
Differential
Figure 13: LED Status for Open-low Controls
If the LED does not respond as indicated
above, replace the control.
IMPORTANT: The P470 control is not repairable.
Do not attempt to repair the
control if it is defective or
functioning improperly. Contact a
Johnson Controls/PENN sales
representative to order a new
control. See
Ordering Information
.