Johnson Controls System 350T A350P Manual page 2

A
pplication
The A350P Temperature Control can be used as a
standalone device or in conjunction with plug-together
accessory modules. The addition of S350 Stage
Modules allows for the control of multiple stage
HVAC/R applications. Typical application for the
A350P includes:
•
proportional heating control with staged direct
expansion cooling
•
simple temperature control for air handling units
•
modulating damper actuators for mixed air control
•
simple proportional mixed air control
A typical System 350 Temperature Control setup
includes the following:
•
A350P Temperature Control
•
A99B Series Temperature Sensor
•
Y350R Power Module (or 24 VAC Class 2
transformer)
•
S350 Stage Modules
•
D350 Digital Temperature Display Module
(One of Four)
Throttling Range
Potentiometer
Minimum Output
Potentiometer
LED Indicator
(Percent of Output)
2 System 350 A350P Electronic Proportional Plus Integral Temperature Control Product/Technical Bulletin
Cover Screw
Setpoint
Dial
THROT
RANGE
V: 0-10 VDC Output
I: 0-20 mA Output
SN: Sensor Input
Figure 2: Interior View Showing A350P Control's Features
O
peration
The A350P control operates on 24 VAC/VDC and
provides two simultaneous analog outputs:
0 to 10 VDC and 0 to 20 mA. A cover-mounted,
10-segment Light-Emitting Diode (LED) bar graph
indicates percentage of output.
Features include:
•
adjustable setpoint
•
adjustable minimum output
•
adjustable throttling range (proportional band)
•
selectable integration time constant
•
selectable Reverse Acting (RA) or Direct Acting
(DA) mode of operation
IMPORTANT:
Module
Connector
MIN
OUTPUT
shown in proportional-only position.
Operation Mode
Jumper Positions
24V: 24 VAC (+)
C: Common (-)
VDC: +5 VDC (not used)
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.
Integration
DIP Switch
Fast
Medium
Slow
Off
On
Integration DIP switch is
Reverse
Acting (RA)
Direct
Acting (DA)