Rhella 4-Wire Thermal Actuator

Rhella 4-Wire Thermal Actuator

In stock

SKU: TAC424 Category:


Rhella TAC424 thermal 4-wire manifold valve actuator

The TAC424 is designed to work with Rhella Radiant Manifolds. It provides individual loop flow control on a multi-zoned manifold.


  • Status Indicator
  • 4-wire
  • Normally Closed
  • Hand-tight installation onto the manifold.
Actuator       TAC424  Four Wire Normally Closed
Voltage 24VAC
Switch-on current max 250 mA
Operating current 75 mA
Operating capacity  3 W
Closing and opening times 3 minutes
Displacement 4 mm
Pulling Load 100 N +/- 5 %
Ambient temperature 0°C up to +65 °C
Operating range -58 to 140℉ (-50 to 60 ℃)
Weight 100 g with cable


Components may become damaged during transportation and storage.

  • Check all parts.
  • Replace damaged actuators.
  • Do not attempt to repair.
  • Mount the actuator so that it is aligned horizontally or facing up. If you align the actuator facing down, its useful life may be shorter due to contamination
Wire on Actuator Uponor Zone Control Module TACO Zone Valve Controller
Blue (24 VAC) R1 1
Brown (24 VAC) R2 2
Black (End Switch) Y1 3
Black (End Switch) Y2 4

Connect 24 VAC power from a thermostat or zone control module to the brown and blue wires of the actuator. When 24 VAC power is applied to the actuator, it will take 3-4 minutes for the actuator to fully open. When power is cut, it will take 3-4 minutes for the actuator to fully close. A dry-contact end switch is built in to the actuator. When the actuator fully opens, the end switch will close. If required, connect the two black end switch wires to a suitable 24 VAC-powered relay, to activate a device to be operated by the actuator’s end switch. If the end switch is not needed, it is not necessary to use the black wires, and they may be trimmed.

Additional information

Weight 0.25 lbs