Taco®, 555-050RP, Heat Motor Valves, 24 VAC, 125 psi

Taco 555-050RP Replacement Power Head – 24V Heat Motor Assembly for 570 Series Zone Valves

The Taco 555-050RP is a factory replacement power head designed for use with Taco 570 Series heat motor zone valves. This 24V actuator restores functionality to zone valves without requiring removal or replacement of the valve body, minimizing downtime and eliminating the need to drain the system during service.

The 555-050RP is a direct-fit component that attaches to the existing valve body using the twist-off mounting system. It includes the heat motor, housing, wiring terminals, and mechanical return components necessary for normal operation in hydronic heating applications.

Key Product Features

• Voltage: 24 VAC, 60 Hz
• Power Consumption: Approx. 7.7 watts
• Actuator Type: Heat motor with spring return
• Mounting: Twist-off design compatible with all Taco 570 Series valve bodies
• Function: Normally closed (opens on power, closes on loss of power)

Application and Use

• Compatibility: For use with Taco 570 Series 2-way zone valves, including models 571, 572, and 573
• Installation: Can be installed without draining the heating system
• Service Use: Ideal for actuator replacement due to failed heat motor or wiring damage

Installation Notes

Power must be disconnected before servicing. Align actuator head with valve stem and twist to lock into place. Secure all wiring to appropriate 24V control circuit. Ensure compatibility with control panels or thermostats rated for 24V operation.

Field Considerations

The 555-050RP is commonly used during maintenance on zone-controlled hydronic systems in residential and light commercial buildings. It provides reliable actuation for hot water baseboard, panel radiators, and radiant floor loops using 570 Series valves. Replacement does not affect hydraulic performance, as the valve body remains in place.