Danfoss TWA-ZL Data sheet

Data sheet

Thermal actuator
TWA-ZL

Description

Ordering

Danfoss thermal actuator TWA-ZL is used with
Danfoss valves type VZL. The actuator can be
controlled with a on/o controller or switch.

Type Power supply Code No.

TWA-ZL NC 24 V AC/DC 082H3100

TWA-ZL NO 24V AC/DC 082H3101

TWA-ZL NC 230 V AC 082H3102

TWA-ZL NO 230 V AC 082H3103

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

Features:

• Position indicator

• Normaly opened (NO) or normaly closed (NC)

version

• Cable included

Main data:

• Nominal voltage:

- 24 V AC/DC or 230 V AC ; 50/60 Hz

• Control input: on/o

• Force: 105 N

• Stroke: 2,8 mm

• Full stroke travel time: 3 min

• Max. medium temperature: 120 °C

Technical data

DEN-SMT/SI

Power supply V 24 AC/DC or 230 AC

Power consumption VA 2

Frequency Hz 50/60

Control Input on/o

Closing force N 105

Max. stroke mm 2,8

Full stroke travel time min 3

Max. medium temperature

Ambient temperature 2 … 60

Storage and transport temperature -40 … +70

Protection Class II

Grade of enclosure IP 41

Weight kg 0,5

Cable length m 1,2

1)

When heating th e actuator full stroke time i ncreases up to some minutes – it dep ends on the ambient temperat ure

VD.LE. R2.02 © Danfoss 05/2012

1)

120

°C

1

Data sheet Thermal actuators TWA-ZL

Operation

TWA-ZL 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-ZL NC version, in the non-energized
state actuator’s stem is retracted

- TWA-ZL NO version, in the non-energized
state actuator’s stem is extracted

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

The TWA-ZL NO has an internal spring, which is
factory xed with a split ring (g.1) to hold the
spring retracted in its o -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.

Remark:

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 (g.2).

Fig. 1 Normaly opened (NO) version

Actuator stem up Actuator stem down

Fig. 2

Blue/Brown

VZL valve has closed AB port in stem up position.
This is done by means of valve internal spring in
case of no actuator force.

TWA-ZL & VZL combinations

TWA-ZL NC & VZL:

- in the non-energized state valve path A-AB is
closed (g.3)

- in the energized state valve path A-AB is
opened

TWA-ZL NO & VZL:

- in the non-energized state path A-AB is
opened (g.4)

- in the energized state path A-AB is closed

Remark for 3-port or 4- port VZL valves:

Due to shorter actuator stroke in compare to the
valve stroke port B can not be closed. Therefore this
combination can not be used as a switch over valve.

Disposal The actuator must be dismantled and the

elements sorted into various material groups
before disposal.

Normaly Closed (NC)

Fig. 3 TWA-ZL NC & VZL

Blue/Brown

Normaly Opened (NO)

Fig. 4 TWA-ZL NO & VZL

2

VD.LE. R2.02 © Danfoss 05/2012

DEN-SMT/SI