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A
djustments
Refer to the following steps for adjusting stage module
settings. (See Figures 3, 4, and 5.)
!
WARNING: Risk of Electrical Shock.
Disconnect power supply to
avoid possible electrical shock or
equipment damage. More than
one disconnect may be required
to completely de-energize
equipment.
1. Ensure all power to system is off.
Each stage module may be receiving separate
power sources. Make sure all power sources to
each stage module are off.
2. Remove the stage module cover by loosening the
four captive cover screws.
3. Set the mode of operation by positioning the
jumpers (at jumper terminal J2) for Cooling,
Dehumidification, or Direct Acting mode. Position
the jumpers vertically for Heating, Humidification,
or Reverse Acting mode.
Note: The S350A, S351A, and S352A Stage
Modules are configured with the jumpers in
the horizontal position at the factory.
4. Adjust the differential using the potentiometer
marked DIFF to the desired setting (the difference
in degrees, % RH, or psi between energization
and de-energization of the stage module's relay).
5. Adjust the offset using the potentiometer marked
OFFSET to the number of degrees, % RH, or psi
from the System 350 control's setpoint at which
the stage relay de-energizes (above setpoint with
Cooling, Dehumidification, or Direct Acting mode
selected, or below setpoint with Heating,
Humidification, or Reverse Acting mode selected).
6. Replace the cover on the stage module and fasten
in place with screws.
7. Restore power to system.
4
S350A Temperature, S351A Humidity, and S352A Pressure Stage Modules Product/Technical Bulletin
Offset
Potentiometer
Module
Connector
Relay Energized
LED Indicator
Relay
Cover Screw
1 of 4
N.C.
COM
Relay
Output
Figure 3: Interior View of S350A Stage Module
Offset
Potentiometer
Module
Connector
Relay Energized
LED Indicator
Relay
Cover Screw
1 of 4
N.C.
COM
Relay
Output
Figure 4: Interior View of S351A Stage Module
Offset
Potentiometer
Module
Connector
Relay Energized
LED Indicator
Relay
Cover Screw
1 of 4
N.C.
COM
Relay
Output
Figure 5: Interior View of S352A Stage Module
Differential
Potentiometer
Module
Connector
Jumper
Position at J2
Heating
Cooling
N.O.
Terminals
Differential
Potentiometer
Module
Connector
Jumper
Position at J2
Humidification
Dehumidification
N.O.
Terminals
Differential
Potentiometer
Module
Connector
Jumper
Position at J2
Reverse
Acting
Direct
Acting
N.O.
Terminals
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