The main deity is Prasanna Venkatachalapathy[3] who faces towards Southern direction.
Normally, in Vaishnavite temples, main deity faces Eastern direction.
During the reign of King (Mannar) Thirumalai Naicker, he was a devotee of Lord Vishnu (Shri Venkatachalapathy) in Tiruppathi.
And on hearing the sound of the last bell in Madurai, King Thirumalai Naicker to finish his pooja and thereafter to have had his breakfast.
He stopped for a while and found an immediate darshan (Prasanna) of Lord Venkatachalapathy there (now called Tallakulam).