Submittal Sheet

Application
The Uponor Thermal Actuator
(four-wire) is a thermally activated,
slow-opening operator that provides
individual flow control (per loop) on
a multi-zoned manifold (manifold
serving more than one zone).
Part Number
A3010522
Voltage
24VAC +/-10%
Current Drain
70mA/2w (brown and blue leads)
3.5VA
End Switch
Maximum 2A/24V dr
y contact
(green leads)
Installation
The Thermal Actuator mounts
directly onto Uponor brass valved
manifolds (manifold must be
mounted in the return position).
The quick-release feature of the
actuator enables balancing of the
manifold valves at any time. Refer
to the Uponor Radiant Floor
Heating Installation Handbook
for valve balancing instructions.
Refer to the following instructions
to install the Thermal Actuator.
1. Secure the green ring onto
the manif
old valve
(hand tighten only).
2. Attach the actuator to the ring by
pressing the buttons on the sides
of the actuator.
3. Push the actuator onto the ring
and release the buttons.
4.
Connect the 24-volt
electrical wiring.
5. Initialize the actuator
(see Initialization section).
Initialization
Since the actuator ships in a partially
open position to protect it during
shipment, the actuator needs to be
fully cycled (opened and closed) to
operate. This also closes the end
switch in a powered-down state.
Refer to the following instructions
to initialize the Thermal Actuator.
1. Power up the system.
2. Turn up the thermostat to create
a call for heat. This will fully open
the valve. You will hear a click on
the first open cycle. This first cycle
may tak
e six to 10 minutes.
3. Turn down the thermostat.
4. The actuator is now ready for
normal operation.
Note: Failure to initialize the
actuator may result in a continuous
call for heat because the end switch
is closed in the powered-down state.
Maximum Number of
Thermal Actuators
12 Thermal Actuators — 50VA
19 Thermal Actuators — 75VA
25
Thermal
Actuat
ors — 100VA
(Computed with a 10% line loss)
RADIANT HEATING
SYSTEMS
THERMAL ACTUATOR
TECHNICAL BULLETIN