User Guide

2 System 350 P352P Electronic Proportional Plus Integral Static Pressure Controls
A
pplication Overview
The P352P Pressure Controls can be used as stand alone
devices or in conjunction with plug-in accessory modules to
control variable speed drives, motor actuators, or other
devices. The P352P Static Pressure Controls are not
typically used with staging modules. Consult Johnson
Controls Application Engineering for specific information
if a question regarding a specific application arises.
Typical applications include:
• duct static pressure control
• building pressurization
A typical System 350 static pressure control scheme
includes the following:
P352P Pressure Control
Y350R Power Module (or 24 VAC transformer)
D352CA Digital Pressure Display Module
(in. W.C.)
DPT-2640 Pressure Transmitter
O
peration
IMPORTANT: All System 350 Controls are designed
for use only as operating controls.
Where an operating control failure
would result in personal injury and/or
loss of property, it is the responsibility of
the installer to add devices (safety, limit
controls) or systems (alarm, supervisory
systems) that protect against or warn of
control failure.
The P352P operates on 24 VAC/VDC and provides two
simultaneous analog outputs: 0 to 10 VDC and
0 to 20 mA. A ten segment front panel LED bar graph
indicates percentage of output. Adjustable features include:
• setpoint
• minimum output
• throttling range (proportional band)
• integration constant
• reverse or direct acting mode of operation
Direct Action
Reverse Action
Module Connector
Percent of Output LED Indicator Lights
Minimum Output Potentiometer
Throttling Range Potentiometer
0 to 20 mA Output
0 to 10 VDC Output
V
I
SN VDC
C
24V
Setpoint Potentiometer
43
21
C1
C2
C3
Off
Integration
DIP Switch
Positions
Operational
Mode Jumper
Positions
Setpoint Potentiometer
OUT
EXC
COM
DPT-2640*
Use the 0-5 V output
of the DPT-2640
as the input to the
P352P.
*
O
N
Figure 2: Interior View Showing P352P Features