APC AFX Series Technical Information download pdf (Page 18)

15Remote Air Cooled Condenser

Adjusting the S350A/B

Refer to the following steps for adjusting stage module settings.

Electrical Hazard:

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 power from separate

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 heating/cooling jumper blocks to the desired mode of operation. Position the jumper

blocks vertically for heating or horizontal for cooling.

4. Adjust the differential using the potentiometer marked DIFF to the desired setting (the difference

in degrees [3°F] between energizing and de-energizing the stage module relay).

5. Use the potentiometer marked OFFSET to adjust the offset to the number of degrees from the

System 350 control setpoint at which the stage relay de-energizes.

6. Replace the cover on the stage module and fasten it in place with screws.

7. Restore power to system.

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APC AFX Series Technical Information Page 18