What power supply specifications does the Pro 5000 require?
The NA version requires a 16.5 VAC 40 VA wall transformer with 115 VAC/60Hz input, providing 12 VDC 2-amp continuous power with backup battery charging. The European version requires a 230VAC/50-60Hz input with a 24 VDC 2.5A output CE certified AC-DC power supply (Honeywell part number PSX220LPS recommended). All power connections should use 18 gauge or larger wiring.
From the official Honeywell Pro 5000 Thermostat manual, page 14
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