How to install fan center for gas heating system with circulator pump
Any technical material available on installing fan centers besides manufacturers instruction

When you have a regular furnace you use a fan center. When you have a boiler you have a aquastat or controls for water temperature that turn on the circular.

Can you give more information. What are you working on (brand name) and what are you trying to do. In the past there has been fan centers used for water pump applications but they are rare.