Voltage Change : Sentra Temperature Control Units Manufactured After January 1, 2011

• A qualified field technician can convert the voltage on most standard Advantage Sentra "SK" temperature control units. Contact the Advantage Service department with your unit serial number to confirm that your unit can be converted. After confirming that your unit can be converted use this document as a guide to making the voltage change.
• This document outlines the steps required to change the voltage from 240 to 480 or from 480 to 240 volts for units manufactured after January 1, 2011. Refer to FYI #218 for voltage conversion instructions for units manufactured prior to January 1, 2011.
• Assistance is available during business hours from the Advantage Service department at 317-887-0729. Contact Advantage for other power supply requirements.

For a field voltage change, the following items will required replacement or rewiring:

• Heater (rewiring)
• Motor (rewiring)
• Transformer (rewiring)
• Replace unit data tag with tag showing new voltage and amp rating.

Typical conversions for ½ to 7½ horsepower motors and 10 to 16 kW heaters are shown on this page. Consult the factory for other units:

• 240/3/60 to 480/3/60
• 480/3/60 to 240/3/60
• 180/3/60 to 208/3/60

A qualified technician should follow this procedure to complete a field voltage change.

1. Disengage operations. Verify all system pressure is relieved and the unit"s pressure gauges read "0".
2. Disengage main electrical supply. Follow proper lock-out/tag-out procedures.
3. Remove the lift-off access panel and set aside.
4. Rewire the heater to the new voltage.
5. On some models, remove the thermoformed front panel and open the electrical cabinet panel door. On other models, unplug the instrument connectors to fully extend the hinged panel.
6. Rewire the pump motor for the new voltage. Most Sentra pump motors are dual voltage.
7. Rewire the transformer to the proper voltage as shown by the schematic on the transformer.
8. Replace the motor starter and overload block. Adjust the overload block settings for the current draw at the new voltage.
9. Replace the motor starter and overload block. Adjust the overload block settings for the current draw at the new voltage.
10. Once a voltage change is complete, be certain the unit is proberly connected to the new voltage supply as outlined in Section 2.5 of the Operations manual. Restart unit operations according to section 3 of the manual.