Ionic Refresher startY


Can you tell me how to use startY with the Ionic refresher? I have used like below.But it is not working?

My use case:

At this moment where pull to refresh can be triggered from anywhere on the screen. is there an option on Ionic that the gesture used to trigger pull ONLY works when pulling down is done from the very upper part of the screen?

<ion-refresher (ionRefresh)="getData($event)" [pullMin]="180" startY="80">
    <ion-refresher-content pullingIcon="arrow-dropdown" pullingText="Pull to refresh" refreshingSpinner="crescent" refreshingText="Refreshing...">