Product Overview

S350A Temperature, S351A Humidity, and S352A Pressure Stage Modules Product/Technical Bulletin
5
Setpoint
Temperature
Cooling
Heating
A350
Stage 1
S350A
Stage 2
S350A
Stage 3
S350A
Stage 4
S350A
Stage 5
ON = Energized
OFF = De-energized
ON
OFF
OFF
OFF
OFF
ON
ON
ON
ON
Differential
Differential
Differential
OFF
Higher
Temperature
Lower
Temperature
OFFSET
Differential
OFFSET
OFFSET
Differential
OFFSET
Figure 6: Example of a Heating/Cooling
Application Using One A350 and Four S350As
Higher
Humidity
Setpoint
Relative
Humidity
Dehumidify
Humidify
W351
Stage 1
S351
Stage 2
S351
Stage 3
S351
Stage 4
ON
Differential
OFF
Lower
Humidity
OFF
ON
Differential
OFFSET
OFF
ON
Differential
OFFSET
OFF
ON
Differential
OFFSET
ON = Energized
OFF = De-energized
Figure 7: Example of a
Humidification/Dehumidification Application
Using One W351 and Three S351As
Setpoint
Pressure
Direct
Reverse
P352AB
Stage 1
S352A
Stage 2
S352A
Stage 3
S352A
Stage 4
ON = Energized
OFF = De-energized
OFF
OFF
OFF
ON
ON
ON
ON
Differential
Differential
Differential
Differential
OFF
Higher
Pressure
Lower
Pressure
OFFSET
OFFSET
OFFSET
Figure 8: Example of a Reverse Acting/Direct
Acting Application Using One P352AB
and Three S352As
W
iring
Refer to the following guidelines and wiring diagrams
for proper wiring and terminal designations (See
Figures 9, 10, and 11.)
Note: For information on connecting to an external
transformer refer to the applicable control
bulletin.
!
WARNING:
Risk of Electrical Shock.
Disconnect power to avoid
possible electrical shock or
equipment damage. More than
one disconnect may be required
to completely de-energize
equipment.
IMPORTANT: Make all wiring connections in
accordance with the National
Electrical Code and all local
regulations. Use copper
conductors only. Do not exceed
the control’s electrical ratings.
The stage modules plug into the control and other
add-on modules via 5-pin connectors located on either
side of each module. Wiring is made at the Normally
Open (N.O.)/Normally Closed (N.C.) relay terminal
strip. (See Figures 3, 4, and 5.)