2
System 350
A350P Electronic Proportional Plus Integral Temperature Control Product/Technical Bulletin
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
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:
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.
Cover Screw
(One of Four)
Setpoint
Dial
Throttling Range
Potentiometer
Minimum Output
Potentiometer
LED Indicator
(Percent of Output)
V: 0-10 VDC Output
I: 0-20 mA Output
SN: Sensor Input
24V: 24 VAC (+)
C: Common (-)
VDC: +5 VDC (not used)
Operation Mode
Jumper Positions
Reverse
Acting (RA)
Direct
Acting (DA)
Module
Connector
Integration DIP switch is
shown in proportional-only position.
THROT
RANGE
MIN
OUTPUT
V
I
S
N
V
D
C
C
2
4
V
Fast
Medium
Slow
Off
On
1
2
3
4
Integration
DIP Switch
Figure 2: Interior View Showing A350P Control’s Features
