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THERMOSTATS & CONTROLLERS
22
THERMOSTATS & CONTROLLERS
SYSTEM 350 SETPOINT CONTROLLERS
A350, W351, P352, R353 SERIES
957
3/22/2011
DESCRIPTION
System 350 Setpoint Controllers can be used in con-
junction with plug-in accessory modules to control a wide
v
ariety of single or multistage and proportional control
applications. Plug-in modules allow for sequencing, digi-
tal displays, and reset control applications.
FEATURES
• Proportional plus Integral (PI) control
• Plug-in digital display
• Models in °F or °C
• Surface or DIN rail mounting
• Electronic accuracy and repeatability
• Slave modules for reset and sequence staging
• Setpoint modules for alarm and control
• One-year warranty
CONTROLLERS
A350A is an on/off differential temperature controller with
SPDT relay output and LED indication. This control comes with
one temperature sensor.
A350P is an electronic proportional or PI temperature control
with proportional output of 0-10 VDC and 0-20 mA. This control
comes with one temperature sensor.
A350R is an electronic temperature reverse-reset controller
with an SPST (N.O.) relay, as well as LED indication, setback,
and warm weather shutdown. The A350R raises or lowers
(resets) the setpoint of the controlled variable (water or air)
based on the OSA temperature. This controller comes with two
temperature sensors.
A350SS is an electronic temperature reset module and is used
in conjunction with stage modules. The A350SS has both
reverse-reset and direct-reset capability for water or air. This
controller comes with two temperature sensors.
W351AB is a humidity controller with an SPDT relay and LED
status for control of humidification or dehumidification equip-
ment. The W351AB may have a setpoint of 10% to 90% RH
with an adjustable differential of 2% to 10% RH.
W351PP is a proportional or PI humidity controller with propor-
tional outputs of 0-10 VDC and 0-20 mA for control of humidifi-
cation or dehumidification equipment. The W351PP may have
a setpoint of 10% to 90% RH.
P352AB is a pressure controller with an SPST relay and LED
status for control of compressor loading or pumps.The P352AB
may have a setpoint of 90-250 psig (621-1724 kPa) with an
adjustable differential of 10-100 psig (69-690 kPa) and can be
direct or reverse acting.
P352PQ is a pressure proportional or PI controller with propor-
tional output of 0-10V or 0-20 mA for duct pressure fan control.
It has a setpoint of 0.5" to 5" W.C., -0.25" to 0.25" W.C., or
0.025" to 0.25" W.C., and it can be direct or reverse acting.
++
++
Back
in
(cm)
Side Front
1.56
(3.96)
DIN Rail
Clips
NEMA-1
Weight
≈ 0.8 lb each
(0.36 kg)
2.94
(7.54)
DIN Rail
Mount
2
.40
(6.10)
0.43
(1.09)
2.0
(5.08)
1.20
(3.09)
4.00
(10.16)
5.00
(12.70)
0.42
(1.07)
DIMENSIONS
A350PS-1C
Temperature Control
W351AB-2C
Humidity Control
ADD-ON MODULES
Y350 is a 24 VAC half-wave rectified power module required
for use with all of the controllers.
S350CC is an electronic slave module with its own concealed
temperature setpoint and an SPDT relay with LED status for
control. This module uses the sensor from the accompanying
A350 controller.
S350PQ is an electronic proportional or PI stage module with
its own differential, offset, and analog control outputs. This
module uses the sensor and setpoint from the accompanying
A350 controller.
S35xAA is an electronic stage module with an independent dif-
ferential and offset adjust from setpoint. This sequencing mod-
ule has an SPDT relay with LED status for control.
D35x is a digital module with a button to display the setpoint.
This module comes in many models, including temperature,
humidity, and pressure.
Enclosure NEMA 1
Weight 0.8 lb (0.36 kg)
SPECIFICATIONS