Kohler G, GN, GLN, GLS, GTN, GTS Automatic Transfer Switch Operation and Installation Manual (tp5991)

These Kohler automatic transfer switches are what keep power flowing smoothly between utility and generator in places like commercial buildings, farms, data rooms, and larger homes. This manual is what I keep handy when I’m installing a new ATS, verifying wiring during a service call, or chasing down why the load isn’t transferring cleanly. For example, if a customer complains that the generator starts but the building never picks up on backup power, I use this document to trace the control logic, confirm settings, and verify the switch is installed and adjusted the way Kohler intended.

Applications & Use Cases

• Install a new Kohler G/GN/GLN/GLS/GTN/GTS ATS and route power/control wiring correctly the first time.
• Verify field connections when troubleshooting nuisance trips, no-transfer, or no-retransfer complaints.
• Check control functions and settings so the switch senses utility and generator power the way it should.
• Confirm compatibility and mounting details before ordering parts or committing to a retrofit.
• Use diagrams and descriptions to isolate whether a fault is in the switch, wiring, or generator controls.

FAQ

Q: Can I keep this manual on a tablet or phone in the field?

A: Yes, it’s practical to use digitally so you can zoom in on diagrams and search terms while you’re at the switch.

Q: Should I still print parts of it?

A: I’d print the key wiring and setup pages you use often, so they’re right in front of you when the power is off and space is tight.

Safety Note

Always de-energize and lock out all sources before opening or servicing an automatic transfer switch.