[Elecraft] Maximum SWR for KPA-500 Amplifier without Tuner

[Byron Peebles]

The external amplifier that I am planning to replace handles an SWR of 
3:1 without a tuner.
What is the recommended SWR maximum without tuner for the Elecraft KPA-500?

The only mentions of SWR in the manual are "connect to load of 1.5SWR or 
less" and the hard fault 9.
Does this imply the amp will fault at an SWR of 2.0-3.0 without an 
external tuner?

73, Byron