  We report the discovery of a new eclipsing EL CVn-type binary, consisting of
a $\delta$ Sct-type pulsator and a thermally bloated low-mass pre-He white
dwarf (WD). Spectroscopy and time-series $BV$ photometry of V1224 Cas were
carried out. The spectroscopy reveals a spectral type of A3 for the star.
Light-curve modelling indicate that V1224 Cas is a short-period detached system
containing a possible low-mass WD with an effective temperature of about 9516
K. Based on the effective temperature and the surface gravity of the A-type
primary star from the spectroscopic results, the absolute parameters of the
components were estimated as: $M_{P}$=2.16$\pm$0.22$M_{\sun}$,
$R_{P}$=3.54$\pm$0.12$R_{\sun}$, $L_{P}$=55.9$\pm$6.9$L_{\sun}$,
$M_{S}$=0.19$\pm$0.02$M_{\sun}$, $R_{S}$=0.97$\pm$0.04$R_{\sun}$, and
$L_{S}$=6.9$\pm$0.6$L_{\sun}$. We therefore introduce V1224 Cas as a new EL
CVn-type binary candidate. The light curves in both filters all show
multi-periodic pulsations, superimposed on binary effects. We performed a
preliminary frequency analysis of the light residuals after removing the
synthetic eclipsing curve from the original observational data. The results
suggest that the rapid light variations among the light curves could be
attributed to the $\delta$ Sct-type primary component. We therefore conclude
that V1224 Cas is very likely a WD+$\delta$ Sct binary.
