Danfoss TWA-Z Data sheet

Data sheet

Thermal Actuator TWA-Z

Description					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
Ordering
	Type		Supply voltage			Cable length		Code No.
	TWA-Z NO		24 V AC/DC					082F1260
	TWA-Z NC					1.2 m		082F1262
	TWA-Z NO		230 V AC					082F1264
	TWA-Z NC							082F1266
	TWA-Z NC		24 V AC/DC			5 m		082F1268
	TWA-Z NC		230 V AC					082F1272
	TWA-Z NC		24 V AC/DC			10 m		082F1270
	TWA-Z NC		230 V AC					082F1274
	Service kits - combination with old AB-QM
	Type							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
Technical Data
	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 time1)	min.		3
	Max. medium temperature			120
	Ambient temperature	° C		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 actuator full stroke time increases up to some minutes – it depends on the ambient temperature.

Operation	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:

•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