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Generac — Checking Automatic Operation

Operation · Generator / transfer switch system

From a Generac service manual — check it applies to your exact model before use.

Applies to: Generac GH-410 engine, Generac GT-530 engine, Generac GT-530 engine, Generac GT-990 engine

Procedure

  1. Set generator main circuit breaker to its OFF (or open) position.
  2. Check that the AUTO-OFF-MANUAL switch is set to OFF.
  3. Turn off the utility power supply to the transfer switch using means provided.
  4. Manually set the transfer switch to the UTILITY position.
  5. Turn on the utility power supply to the transfer switch.
  6. Set the AUTO-OFF-MANUAL switch to AUTO. The system is now ready for automatic operation.
  7. Turn off the utility power supply to the transfer switch. The engine should crank and start and the transfer switch should connect load circuits to the standby side.
  8. With the generator running, turn ON the utility power supply; after about fifteen seconds the switch should transfer loads back to the utility power source.
  9. About one minute after retransfer, the engine should shut down.

Specs & values

  • Retransfer time delay about 15 seconds; engine cool-down about 1 minute.

Source: Generac 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.

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