  We perform relativistic configuration-interaction calculations of the energy
levels of the low-lying and core-excited states of beryllium-like iron,
Fe$^{22+}$. The results include the QED contributions calculated by two
different methods, the model QED operator approach and the screening-potential
approach. The uncertainties of theoretical energies are estimated
systematically. The predicted wavelengths of the K\alpha transitions in
beryllium-like iron improve previous theoretical results and compare favorably
with the experimental data.
