Euro-Tech Thermal Equipments air/oil ratiotrol -7052 proportion oil flow to combustion air flow in cross-connected control systems. Outlet oil pressure from the ratiotrol is proportional to the impulse air signal:

7052-01: Outlet pressure is 10 times impulse pressure.

7052-0: Outlet pressure is 12 times impulse pressure

Therefore, as combustion air is turned up or down the ratiotrol causes oil to follow it in proportion. Desired air/oil ratio is set with a manual – valve (1813 Sensitrol Oil Valve) at the burner.