Kohler — Bypassing and Isolating, 600- to 1200-Amp Switches
Maintenance · Bypass/isolation switch and ATS
From a Kohler service manual — check it applies to your exact model before use.
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Before you start
- Bypass and isolate the transfer switch before removing it from the enclosure. The bypass/isolation switch is energized; do not touch the isolation contact fingers or control circuit terminals.
- Do not use excessive force on the mechanical handles.
Procedure
- Check that the manual bypass handle is in the OPEN position, the disconnect switch is in the AUTO position, and the ATS is supplying the load.
- Open the bottom cabinet door and turn the disconnect switch to the INHIBIT position.
- Position the bypass-selector switch to the same power source as the ATS.
- Move the manual-bypass handle to the BYPASS POSITION.
- For testing: rotate the crank mechanism counterclockwise until the ATS location pointer is aligned with test; the ATS TEST position lamp illuminates.
- Turn the disconnect switch to AUTO and run an automatic operation test as described in Section 6.5; end the test before proceeding.
- For isolating: rotate the crank mechanism counterclockwise until the ATS location pointer is aligned with isolate; the ATS ISOLATE position lamp illuminates.
- For removal, disconnect the multipin plugs and external connections from the ATS.
- Rotate the four panel latches to the vertical position.
- Slide the ATS forward and lock the mechanism into place, then remove the ATS from the cabinet.
- To reconnect, place the ATS on the slide mechanism and unlock the slide mechanism.
- Slide the ATS over the power panel latches and rotate the latches to the horizontal position.
- Turn the disconnect switch to INHIBIT and manually operate the ATS to the same position as the bypass switch.
- Reconnect the multipin harness plugs and external connections and rotate the crank mechanism clockwise until the ATS TEST light is illuminated.
- Turn the disconnect switch to AUTO, run an automatic operation test, then turn to INHIBIT and rotate the crank mechanism until the ATS is in AUTO; move the bypass handle to OPEN.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Source: Kohler service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.