It depends on the game you are playing.

TOURNAMENT OR SATELLITE: If playing a Tournament or Satellite and you time out, you will lose the current pot then continue to be antied away until you have no more chips.

RING GAME: If playing a Ring Game and you cannot return in time you are deemed to be all-in for the current amount of chips in the pot. If you have already used your one per day all-in protection, your hand will either be checked or folded if someone bets into them. If you are still not able to reconnect, after ten minutes, you will be removed from the table and your remaining chips will be returned to your account [you will only have 2 such all-ins in a 24 hour period].

Players who try to use the all-in due to disconnection rule to gain an unfair advantage will have their account terminated.

Note: Refunds are not issued for disconnects, only if the server crashes.