Danfoss TWA-A, TWA-V Data sheet

Data Sheet

TWA Electric Valve Actuator

Features:

Ordering Information:

the TWA is energized, an internal wax element gradually heats up opening or closing the valve. TWA can be wired with Danfoss RET-B, RET-24 or FH-WS low voltage thermostats.

• Hot water radiator / baseboard / n tube

heating systems

• Hydronic oor heating systems (zone

controls)

• Hot or chilled water applications

• Slow acting wax element eliminates water

hammer associated with motorized valves.

• Silent operation

• Visual position indicator to show the open or

The TWA (thermal wax actuator) is a 24 volt ac/ dc thermo-hydraulic actuator used with on/o controls to allow ow through the system. When

Code No. Typ e suitable Valve Actuator Position Replaces

088 H 3110

088 H 3111 Normally open 082F1143 (ABNR)

088 H 3114

08 8H3120

08 8H3121 Normally open 082F1142 (ABNV)

* TWA-V is not to be used with VMT valves having Cv > 2.7 GMP

TWA-A RA 2000, RA-C

TWA-V RAV, VMT*

closed position of the valve

• Low power consumption

• Compact size

Normally closed 082F1043 (ABNR)

Normally closed w/ end

switch

Normally closed 082F1042 (ABNV)

Specications:

Suitable systems Hot water applications*

Supply voltage 24V ac/dc (Class II, SELV)

Frequency 50 - 60 Hz

Avg. power consumption 2W

Travel time of spindle ~3 min

Ambient temperature 32 - 140°F (0 - 60°C)

Wire lead length 4ft (1200 mm)

End switch, max. Output 24VAC / 2 A

TWA-A (Maximum ∆p for quiet operation) 8.7 psi (0.6 bar)

TWA-V (Maximum ∆p for quiet operation) 11.6 psi (0.8 bar)

*TWA's are not recommended for steam valves or inside tight enclosures. Excessive ambient temperatures past 140°F (60°C) can place the wax in a semi-liqueed state causing the valve to falsely operate and the regulation to be lost.

Data Sheet TWA Electric Valve Actuator

Electric Connection & Mounting Orientation:

Identifying Mounting Valve Type:

When 24 volts is applied to the actuator, the internal wax element heats up allowing the valve to actuate. Unlike valves that open and close quickly, the actuation of the TWA is slow, reducing water hammer and as a result performs similar to a modulating valve in certain situations.

Valve Style Distinguishing Dimension

RA 2000

RAV / VMT

When the TWA is used on systems with excessive temperatures, the orientation of the actuator should be horizontal to ensure proper airow across the actuator. If it is mounted within an enclosure, proper airow through the enclosure is essential to oset the increased ambient temperature's inuence on the actuator.

7/8” (22.5 mm) outside diameter

1 - 5/16" (34 mm) outside diameter

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