User Guide

8 System 350 P352P Electronic Proportional Plus Integral Static Pressure Controls
C
heckout Procedure
1. Before applying power, make sure installation and
wiring connections are according to job
specifications.
2. After necessary adjustments and electrical
connections have been made, put the system in
operation and observe at least three complete
operating cycles to determine that the system is
stable.
3. If integration is required, select the C1, C2, or C3
integration constant. C3 is the recommended initial
setting. (Refer to the Integration Constant section.)
4. Put the system back into operation. Observe system
operation and make additional adjustments to obtain
stable control (if necessary).
T
roubleshooting
If the control system does not function properly, verify
that the proper mode is selected on each module (e.g.,
RA/DA) and then use the following procedures to
determine the cause of the problem:
1. Check for the proper voltage source applied to the
P352P Control.
a. Connect a Digital Voltmeter (DVM) between
the “24 V” (+) and “C” (-) terminals located on
the P352P’s terminal block (Figure 2).
If an external transformer is used, select
AC volts on the DVM and verify that the
voltage is between
20 and 30 VAC.
If a Y350R Power Module is used,
select DC volts on the DVM and verify
that the voltage is between
16 and 38 VDC.
If an external DC power supply is used,
select DC volts on the DVM and verify
that the voltage is between
22 and 29 VDC.
b. If the DVM reading is within the indicated
voltage range, select DC volts on the DVM
(DVM must be accurate to +/- 0.1 VDC)
Connect the (+) lead to the “VDC” terminal and
the (-) lead to the “C” terminal.
If the DVM voltage is between
13.9 and 14.1 VDC, proceed to Step 2.
If the DVM voltage is above 14.1 VDC,
replace the P352P.
c. If the DVM voltage is below 13.9 VDC, then
disconnect the pressure transmitter completely
and disconnect power to the main blower.
IMPORTANT: Removing the sensor will either turn
the blower off or on, depending on
mode selected on the P352P.
d. Check the voltage again.
If the DVM voltage rises to a value
between 13.9 and 14.1 VDC, then replace
the transmitter.
If the DVM voltage is still below
13.9 VDC, then replace the P352P.
2. Check the P352P for proper operation.
Note: Step 1 must be performed first.
a. Select the RA mode.
b. Adjust the setpoint until it equals the throttling
range.
Note: The right-most LED in the bar graph
should be on.
c. Adjust the setpoint to minimum (turn
completely counter-clockwise).
Note: The illuminated LED should move
from right to left, two or more
positions.
d. Select DA mode.
Note: All LEDs should be off and the VDC
output should be 0.1 VDC.