Danfoss TWA-Z Data sheet

Data sheet

Thermal Actuator TWA-Z

Description

Ordering

Danfoss thermal actuator TWA-Z is used with
Danfoss automatically balanced combination
valves type AB-QM.

The actuator can be controlled with an on/off
controller, pulse width modulation (PWM), or
switch.

These provide a cost effective solution for
the control of hot and /or chilled water for
fan coil units, small reheaters and recoolers in
temperature control systems.

Main features:

• 24 V AC/DC or 230 V AC supply

• Position indicator

• Normally opened (NO) or normally closed
(NC) version

• Max. medium temperature 120 °C

• Cable included

Typ e Supply voltage Cable length Code No.

TWA-Z NO

TWA-Z NC 082F1262

TWA-Z NO

TWA-Z NC 082F12 66

TWA-Z NC 24 V AC/DC

TWA-Z NC 230 V AC 08 2F1272

TWA-Z NC 24 V AC/DC

TWA-Z NC 230 V AC 08 2F1274

24 V AC/DC

1.2 m

230 V AC

5 m

10 m

08 2F1260

08 2F1264

08 2F1268

08 2F1270

Service kits - combination with old AB-QM

Typ e Code No.

TWA-Z adapter for AB-QM, DN 10-32 003Z0239

Disposal

The actuator must be dismantled and the
elements sorted into various material groups
before disposal.

© Danfoss | 2019.05 VD.HP.B2.02 | 1

Data sheet Thermal Actuator TWA-Z

60˚

Blue/Brown

60˚

Blue/Brown

Technical Data

Operation

Power supply V 24 AC/DC, ± 25% 230 AC, ± 25%

Max. inrush current mA < 350 < 250

Power consumption W 2

Frequency Hz 50/60

Control input On/off and PWM

Closing force N 90

Min. stroke mm 2.8

Full stroke time

Max. medium temperature

Ambient temperature 2 … 60

Storage and transport temperature -40 … 70

Ambient humidity 95% r.h., non-condensing

Protection class III II

Grade of enclosure IP 41

Cable length m 1.2, 5 or 10

Weight kg 0 .15

1) When heating the act uator full stroke time increas es up to some minutes – it depends o n the ambient temperature .

1)

min. 3

120

° C

TWA-Z actuator works on the thermal expansion
principle:

• moves actuator stem in one direction in case
of heating of the actuator and

• moves actuator stem in another direction in
case of no heating of the actuator

Two versions of actuators are available:

Fig. 1: NC version

• TWA-Z NO version, in the non-energized state
actuator’s stem is retracted

• TWA-Z NC version, in the non-energized state

Actuator stem up Actuator stem down

actuator’s stem is extracted

Both versions are available in 24V (SELV) or 230V.

The TWA-Z NC has an internal spring, which is
factory fixed with a split ring (Fig.1) to hold the
spring retracted in its off -the-shelf state.
The use of split ring allows the actuator to be
mounted to the valve. Once mounted, the split
ring has to be removed.

Note:
In case the actuator has been dismounted and split
ring removed, split ring can be added back to the
actuator after the heating of the actuator.

The actuator is equipped with a position
indicator to show the position of the actuator
stem (Fig.2).
The AB-QM valve is closed in stem down
position. Without actuator force the internal
spring opens the valve.

Combination, TWA-Z NO & AB-QM (Fig.3)

• in the non-energized state the valve is open

• in the energized state the valve is closed

Combination, TWA-Z NC & AB-QM (Fig.4)

• in the non-energized state the valve is closed
in the energized state the valve is opened.

Fig. 2

Max.

Max.

C

60° C

Fig. 3: TWA-Z NO & AB-QM

Max.

Max.

C

60° C

Fig. 4: TWA-Z NC & AB-QM

NO

NC

Blue/Brown

Blue/Brown

2 | VD.HP.B2.02 © Danfoss | 2019.05