If I enable remi repo to install PHP-FPM it upgrades my PHP version from 5.3.3 to 5.4.18. So, I downgraded it back to PHP 5.3.3 using command "yum -x php5-ioncube-loader downgrade php\*"
It looks like plesk installer needs either atomic or remi repo to install PHP-FPM, but this upgrades PHP...