How to set main host for Adapter Engine in the HA enviroment

Hi, all.

Our XI env. is like the following.

XI 3.0 SP11 on Windows 2003 + SQL Server.

Central Instance(ABAP + J2EE Addon) is running on Host A,

Dialog Instances(ABAP + J2EE Addon) are running on Host B and Host C.

Our design was to have J2EE Adapter engine mainly running on Host A(CI). But after installation, Adapter Engine is running on Host C(one of DIs). When we check from the Runtime WorkBench. It shows Adapter Engine is running on Host C while IS is running on the Host A(CI).

Where can we change this configuration? We want the J2EE AE running on the Central Instance Host.

Any advice appreciated.

Best Regards.