Best I can determine from a service supplement that covers the 5500B and 7500 ... 5500B (LED panel) is ATC 65°F for cold, 105°F for warm, and tap-hot for hot (or maybe 130°F if same as the 7500).
5500A (mechanical panel) is ATC 70°F for cold, 105°F warm (and presumably tap-hot) per the user manual.