Johnson Controls System 350, S350As, S350Cs, S350P, S351A Technical Bulletin
...
System 350™
S350A Temperature, S351A Humidity,
and S352A Pressure Stage Modules
The S350A, S351A, and S352A Stage Modules are
intended to be used with System 350™ controls. Each
of these stage modules plugs into the respective
control module to add multiple-stage capability. These
stage modules have Single-Pole, Double-Throw
(SPDT) relay output with Light-Emitting Diode (LED)
indication.
As are all System 350 products, the stage modules are
housed in NEMA 1, high-impact thermoplastic
enclosures. The modular design provides easy,
plug-together connections for quick installation and
future expandability.
FANs 930, 125
Product/Technical Bulletin S350
Issue Date 0300
Modular Design
❑
Plug-together Connectors
❑
and 35 mm DIN Rail
Mounting
Selectable Mode of
❑
Operation
Adjustable Differential
❑
Adjustable Offset
❑
Figure 1: System 350 Stage Module
Features and Benefits
Permits system to be configured to
equipment, with convenient, future expansion
made easy
Eliminates wiring between modules and
reduces installation costs
Provides independent relay energization,
either above or below setpoint, for
cooling/heating (S350A),
dehumidification/humidification (S351A), or
direct acting/reverse acting (S352A)
Enables user to match the range of
temperature, humidity, or pressure stage
modules to specific application requirements
Allows multiple stage sequencing of 1-30F°
(0.5-17C°) (S350A), 2-30% RH (S351A), or
2-50 psi (S352AA-2)
© 2000 Johnson Controls, Inc.
Part No. 24-7664-1, Rev. D www.johnsoncontrols.com
Code No. LIT-930080
1
pplication
A
The S350A, S351A, and S352A Stage Modules
receive power, setpoint, and sensor input from the
respective System 350 control modules. When
connected, the individual modules act as a multistage
control system.
The maximum number of stages that can be used in a
system varies with the control module type
(temperature, humidity, or pressure) and stage module
design.
Refer to Table 1 or Table 2 to determine the maximum
number of stages that may be used with each control
module. When mixing stage module designs, always
use the lower number.
Note: When using an external transformer, the
Y65 Series or other 40 VA Class 2
transformers are recommended.
Table 1: Maximum Number of Add-on
Modules when Powered by a Y350R
Power Module
Control
Module
A350A
A350B
A350E
A350P
A350R
A350S
W351A
W351P
P352AB
P352PN
Stage
Module
No. Model
Numbers
9
S350As or S350Cs
6
S350As or S350Cs
with 1 S350P
S350As or S350Cs
4
with 2 S350Ps
42S350As or S350Cs
S350As or S350Cs
with 1 S350P
9
S350As or S350Cs
6
S350As or S350Cs
with 1 S350P
S350As or S350Cs
4
with 2 S350Ps
5 S351As 1 D351
4 S351As 1 D351
5 S352As 1 D352A
4 S352As 1 D352A
Display
Module
No. Model
Number
1 D350
1 D350
2 D350s
Table 2: Maximum Number of Add-on
Modules when Powered by an External
Transformer
Control
Module
Stage
Module
No. Model
Numbers
A350A
A350B
A350E
A350P
A350R
A350S
W351A
W351P
P352AB
P352PN
9
S350As or S350Cs
8
S350As or S350Cs
with 1 S350P
S350As or S350Cs
7
with 2 S350Ps
9
S350As or S350Cs
8
S350As or S350Cs
with 1 S350P
S350As or S350Cs
7
with 2 S350Ps
9
S350As or S350Cs
8
S350As or S350Cs
with 1 S350P
S350As or S350Cs
7
with 2 S350Ps
9 S351As 1 D351
9 S351As 1 D351
9 S352As 1 D352A
9 S352As 1 D352A
Notes: This bulletin only refers to the S350A, S351A,
and S352A Stage Modules.
For information on the S350C refer to the
System 350
TM
S350C Temperature Slave
Stage Module Product/Technical Bulletin
(LIT-930084).
For information on the S350P refer to the
System 350
TM
S350P Proportional Plus
Integral Temperature Stage Module
Product/Technical Bulletin (LIT-930086).
For information on the D350, D351 and D352
refer to the
System 350
TM
D350 Display
Modules Product/Technical Bulletin
(LIT-930070)
.
Display
Module
No. Model
Number
1 D350
1 D350
2 D350s
2
S350A Temperature, S351A Humidity, and S352A Pressure Stage Modules Product/Technical Bulletin
O
peration
The S350A, S351A, and S352A Stage Modules
provide SPDT relay output. A front panel LED lights to
indicate when the relay is energized.
IMPORTANT: The System 350 Stage Modules
are intended to control
equipment under normal
operating conditions. Where
failure or malfunction of the
System 350 Stage Modules
could lead to an abnormal
operating condition that could
cause personal injury or damage
to the equipment or other
property, other devices (limit or
safety controls) or systems
(alarm or supervisory systems)
intended to warn of or protect
against failure or malfunction of
the System 350 Stage Modules
must be incorporated into and
maintained as part of the control
system.
Offset Adjustment
The offset adjustment determines the amount of offset
from the control module setpoint at which the stage
module relay de-energizes.
With the jumpers positioned vertically, the stage
module is set for Heating (S350A), Humidification
(S351A), or Reverse Acting (RA) (S352A) operation. In
this mode, the relay and LED indicator de-energize
when the sensed temperature, humidity, or pressure
rises to the setpoint
minus
offset value.
Note: The S350A, S351A, and S352A Stage
Modules are configured with the jumpers in
the horizontal position at the factory.
Refer to Figures 6, 7, and 8 for examples of S350A,
S351A, and S352A applications.
imensions
D
Mounting Slots
For No. 6 Screws
1-1/2
(40)
1/8 (4)
2-15/16
(75)
7/16
(11)
DIN Rail
Mount
5 (127)
1-3/16
(31)
ON
JOHNSON
CONTROLS
CONTROLS
2-3/8
(61)
S350
O
O
Differential Adjustment
Differential is defined as the difference in degrees,
% RH, or psi between energization and
de-energization of the stage module’s relay.
Operation Mode Selection
The S350A, S351A, and S352A utilize jumpers (at
jumper terminal J2) to select the operation mode. (See
Adjustments
With the jumpers positioned horizontally, the stage
module is set for Cooling (S350A), Dehumidification
(S351A), or Direct Acting (DA) (S352A) operation. In
this mode the relay and LED indicator de-energize
when the sensed temperature, humidity, or pressure
drops to the setpoint
section and Figures 3, 4, and 5.)
plus
offset value.
2-3/8
(61)
7/8 (22)
Conduit
Hole
7/8 (22)
Figure 2: System 350 Stage Module
Dimensions, in. (mm)
ounting
M
Each System 350 Stage Module is housed in a
compact NEMA 1 plastic enclosure designed for
standard 35 mm DIN rail mounting. Four key-slot
mounting holes on the back of the control case are
provided for surface mounting. (See Figure 2.) The
modules are not position sensitive, but should be
mounted for convenient access to wiring and
adjustments.
Note: When mounting any System 350 module to
rigid conduit, attach the hub to the conduit
before securing the hub to the control
enclosure.
S350A Temperature, S351A Humidity, and S352A Pressure Stage Modules Product/Technical Bulletin
3
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