We previously discovered multiple superconducting phases in the ammoniated Na-doped FeSe material, (NH3)(y)NaxFeSe. To clarify the origin of the multiple superconducting phases, the variation of T-c was fully investigated as a function of x in (NH3)(y)NaxFeSe. The 32 K superconducting phase is mainly produced in the low-x region below 0.4, while only a single phase is observed at x = 1.1, with T-c = 45 K, showing that the T-c depends significantly on x, but it changes discontinuously with x. The crystal structure of (NH3)(y)NaxFeSe does not change as x increases up to 1.1, i.e., the space group of I4/mmm. The lattice constants, a and c, of the low-T-c phase (T-c = 32.5 K) are 3.9120(9) and 14.145(8) angstrom, respectively, while a = 3.8266(7) angstrom and c = 17.565(9) angstrom for the high-T-c phase (similar to 46 K). The c increases in the high T-c phase, implying that the T-c is directly related to c. In (NH3)(y)LixFeSe material, the T-c varies continuously within the range of 39 to 44 K with changing x. Thus, the behavior of T-c is different from that of (NH3)(y)NaxFeSe. The difference may be due to the difference in the sites that the Na and Li occupy.