Resideo - Honeywell Home YTHM5421R1010 Heat Pump Thermostat Interface Module Kit

Heat Pump Thermostat Interface Module Kit connects with Honeywell Home VisionPRO and Prestige programmable thermostats to extend reliable control of multi-stage systems. This vertical-mount, gray interface is designed for compatibility with THX9421R5021 and supports 18–30 VAC power. It accommodates up to 4 heat / 2 cool for heat pumps or up to 3 heat / 2 cool for conventional setups, delivering flexible performance for diverse climates.

Key specifications and compatibility ensure seamless integration with existing equipment. The kit features a robust terminal design, including R, RC, RH, C, U1, U2, A, B, C, D, and is suitable for a wide range of applications.

• Vertical mounting in a gray finish for easy installation
• Compatible with VisionPRO and Prestige thermostats
• Supports up to 4H/2C heat pump or 3H/2C conventional systems
• Terminal designations R, RC, RH, C, U1, U2, A, B, C, D
• Voltage and current 18–30 VAC, 50/60 Hz; 1 A (cool/heat), 0.5 A (fan)
• Operating range -40 to 165°F; 5–95% RH non-condensing
• Broad compatibility with THX9421R5021 and diverse fuel types
• Applications Gas, Oil, Electric, Heat Pump, Forced Warm Air, Hot Water, Steam or Gravity