fan delay on make timer to help start up for ac generator

Received the ICM Controls ICM102B timer and it works. Took about 5 minutes to install, moved the thermostat fan low connector to the relay, made up a short jumper back the the control panel. Secured with a screw to the interior of the air filter plenum. Set at minimum, I get 2.5 seconds of delay, the adjustment is not linear, a small increase jumps the delay to 20 seconds. Maybe a bad unit. I turned off the converter and ran the batteries down to 11.35 volts and it still timed and latched reliably.

WDP