Data sheet
Thermal Actuator TWA-Z
Description |
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Danfoss thermal actuator TWA-Z is used with |
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Danfoss automatically balanced combination |
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valves type AB-QM. |
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The actuator can be controlled with an on/off |
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controller, pulse width modulation (PWM), or |
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switch. |
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These provide a cost effective solution for |
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the control of hot and /or chilled water for |
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fan coil units, small reheaters and recoolers in |
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temperature control systems. |
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Main features: |
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• 24 V AC/DC or 230 V AC supply |
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Position indicator |
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• Normally opened (NO) or normally closed |
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(NC) version |
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• Max. medium temperature 120 °C |
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Cable included |
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Ordering |
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Type |
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Supply voltage |
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Cable length |
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Code No. |
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TWA-Z NO |
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24 V AC/DC |
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082F1260 |
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TWA-Z NC |
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1.2 m |
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082F1262 |
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TWA-Z NO |
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230 V AC |
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082F1264 |
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TWA-Z NC |
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082F1266 |
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TWA-Z NC |
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24 V AC/DC |
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5 m |
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082F1268 |
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TWA-Z NC |
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230 V AC |
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082F1272 |
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TWA-Z NC |
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24 V AC/DC |
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10 m |
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082F1270 |
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TWA-Z NC |
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230 V AC |
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082F1274 |
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Service kits - combination with old AB-QM |
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Type |
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Code No. |
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TWA-Z adapter for AB-QM, DN 10-32 |
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003Z0239 |
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Disposal |
The actuator must be dismantled and the |
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elements sorted into various material groups |
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before disposal. |
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© Danfoss | 2019.05 |
VD.HP.B2.02 | 1 |
Data sheet |
Thermal Actuator TWA-Z |
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Technical Data |
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Power supply |
V |
24 AC/DC, ± 25% |
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230 AC, ± 25% |
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Max. inrush current |
mA |
< 350 |
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< 250 |
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Power consumption |
W |
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2 |
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Frequency |
Hz |
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50/60 |
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Control input |
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On/off and PWM |
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Closing force |
N |
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90 |
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Min. stroke |
mm |
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2.8 |
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Full stroke time1) |
min. |
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3 |
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Max. medium temperature |
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120 |
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Ambient temperature |
° C |
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2 … 60 |
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Storage and transport temperature |
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-40 … 70 |
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Ambient humidity |
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95% r.h., non-condensing |
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Protection class |
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III |
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II |
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Grade of enclosure |
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IP 41 |
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Cable length |
m |
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1.2, 5 or 10 |
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Weight |
kg |
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0.15 |
1) When heating the actuator full stroke time increases up to some minutes – it depends on the ambient temperature.
Operation |
TWA-Z actuator works on the thermal expansion |
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principle: |
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• moves actuator stem in one direction in case |
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of heating of the actuator and |
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• moves actuator stem in another direction in |
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case of no heating of the actuator |
Two versions of actuators are available:
•TWA-Z NO version, in the non-energized state actuator’s stem is retracted
•TWA-Z NC version, in the non-energized state 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. 1: NC version
Actuator stem up |
Actuator stem down |
Fig. 2
Blue/Brown
Max.. NO
60°˚ C
Fig. 3: TWA-Z NO & AB-QM
Blue/Brown
Max.. NC
60°˚ C
Fig. 4: TWA-Z NC & AB-QM
2 | VD.HP.B2.02 |
© Danfoss | 2019.05 |