I have a 22kW Generac Guardian Standby Generator model 70422, serial 3001330170 that has been operating for two years now (from Ziller). It worked fine with our old Trane 3.5 ton A/C outdoor unit. (I do have load shed connected to the transfer switch although it never sheds.) We recently had our A/C outdoor unit replaced with a Trane XR 4TTR6042J1000A with a 3.5 ton Climatuff Scroll Compressor. RLA is 16.7. In the interest of being proactive do you think I should install a Sure Start or will I be okay without it? (I could do an experiment by disconnecting service and letting the generator take over but I don’t want to risk damaging my new A/C unit.) If you think a Sure Start is needed, with a RLA of 16.7, should I use the 8-16 RLA or the 16-32 RLA Sure Start? In my mind 16.7 is borderline between the two Sure Start sizes so I want to choose the correct size since the documentation states that incorrect sizing will result in damage to the Sure Start and/or Air Conditioning unit. Thanks for your input.