Johnson Controls System 350 Technical Bulletin page 5

Higher
Temperature
ON
OFF
OFFSET
Setpoint
OFF
Temperature
ON = Energized
OFF = De-energized
Lower
Temperature
A350 S350A
Stage 1 Stage 2
Cooling
Figure 6: Example of a Heating/Cooling
Application Using One A350 and Four S350As
Higher
Humidity
ON
Setpoint
Relative
OFF
Humidity
ON = Energized
OFF = De-energized
Lower
Humidity
W351
Stage 1 Stage 2
Dehumidify
Figure 7: Example of a
Humidification/Dehumidification Application
Using One W351 and Three S351As
S350A Temperature, S351A Humidity, and S352A Pressure Stage Modules Product/Technical Bulletin
ON
OFFSET
OFFSET
OFF
OFF
OFFSET
OFF
ON
ON
S350A S350A
S350A
Stage 3
Stage 4 Stage 5
Heating
ON
OFF
OFFSET
OFFSET
OFFSET
OFF
OFF
ON
ON
S351
S351 S351
Stage 3 Stage 4
Humidify
Higher
Pressure
Setpoint
Pressure
Lower
Pressure
ON
Figure 8: Example of a Reverse Acting/Direct
Acting Application Using One P352AB
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.
IMPORTANT:
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.)
ON
ON
OFF
OFFSET
OFF
OFFSET
OFF
ON = Energized
OFF = De-energized
S352A
P352AB S352A
Stage 3
Stage 1 Stage 2
Direct Reverse
and Three S352As
Disconnect power to avoid
possible electrical shock or
equipment damage. More than
one disconnect may be required
to completely de-energize
equipment.
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.
OFFSET
OFF
ON
ON
S352A
Stage 4
5