Facts About Generators
GeneratorsDirectoryCompareRepairEnginesControllersPartsManufacturersGuides
Search models or part #
Home›Repair guides›Before starting, complete the following:

Generac 20kW — Before starting, complete the following:

For the Generac 20kW.

Browse Generac generators & specs →

Procedure

  1. 10. Connect an accurate AC voltmeter and a frequency meter across transfer switch terminal lugs E1 and E2. Voltage should be 238-242 at a frequency of 59.5-60.5 Hertz.
  2. 11. Connect the AC voltmeter test leads across terminal lugs E1 and neutral; then across E2 and neutral. In both cases, voltage reading should be 119-121 volts AC.
  3. 12. Set the generator’s main circuit breaker to its OFF (or OPEN) position. Let the engine run at no-load for a few minutes to stabilize internal engine generator temperatures.
  4. 13. Set the generator's AUTO/OFF/MANUAL switch to OFF. The engine should shut down.

Source: manual:9f84685f-0bec-42e0-a4e9-5c2c50b4b67b.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.