Submittal Sheet

ManualsBrandsDanfoss ManualsHeating SuppliesTWA Actuator, 24V, w/ End Switch

Data sheet TWA

Electric Valve Actuator

VDSBA122 © Danfoss 06/09

Features:

Ordering Information:

Speciﬁcations:

The TWA (thermal wax actuator) is a 24 volt

ac thermo-hydraulic actuator used with on/

oﬀ controls to activate several types of valves

and ﬂoor heating manifolds. When the TWA is

energized, an internal wax element gradually

heats up opening or closing the valve. TWA can

be used with Danfoss RET-B, RET-24 or FH-WS

low voltage thermostats.

Typical applications:

Hot water radiator / baseboard / ﬁn tube

•

heating systems

Hydronic ﬂoor heating systems (zone •

controls)

Hot water service systems•

Hot/chilled water for air handlers•

Slow acting wax element eliminates water •

hammer associated with motorized valves.

Silent operation•

Proven reliability•

Visual position indicator to show the open or •

closed position of the valve

Low power consumption•

Compact size•

Code No. Type suitable Valve Actuator Position Replaces

088H3110

TWA-A RA 2000, RA-C

NC 082F1043 (ABNR)

088H3111 NO 082F1143 (ABNR)

088H3114 NC, w/ end switch -

088H3120

TWA-V RAV, VMT*

NC 082F1042 (ABNV)

088H3121 NO 082F1142 (ABNV)

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

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 - 40°F (0 - 60°C)

Wire lead length 4ft (1200 mm)

End switch, max. Output 24VAC / 2 A

Maximum ∆p (TWA-A) (TWA-L) 8.7 psi (0.6 bar)

Maximum ∆p (TWA-V) 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-liqueﬁed state causing the valve to falsely

operate and the regulation to be lost.

Summary of content (4 pages)

PAGE 1
Data sheet TWA Electric Valve Actuator Features: energized, an internal wax element gradually heats up opening or closing the valve. TWA can be used with Danfoss RET-B, RET-24 or FH-WS low voltage thermostats. The TWA (thermal wax actuator) is a 24 volt ac thermo-hydraulic actuator used with on/ off controls to activate several types of valves and floor heating manifolds. When the TWA is Ordering Information: Code No.
PAGE 2
Data sheet TWA Electric Valve Actuator Electric Connection & Mounting Orientation: 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.
PAGE 3
Data sheet TWA Electric Valve Actuator Dimensions: TWA-A, RA 2000 Straight Valve, Double Solder Union Code No. Size L1 L2 H 013G8042 1/2" 2-5/8" 3-15/16" 3-25/32" 013G8044 3/4" 2-15/16" 4-5/8" 3-29/32" Straight Valve, NPT Code No. Size 013G8015 1/2" 2-5/8" L1 3-1/4" L2 3-19/32" H 013G8020 3/4" 2-29/32" 4-13/16" 3-13/16" 013G8025 1" 3-17/32" 5" 3-3/4" 013G8032 1-1/4" 4-1/4" 5-9/32" 3-7/8" Side Mounted Angle Valve Code No.
PAGE 4
Data sheet TWA Electric Valve Actuator Danfoss can accept no responsibility for possible errors in printed materials and reserves the right to alter its products without notice. All trademarks in this material are property of the respective companies. Danfoss and Danfoss logotype are trademarks of Danfoss A/S. All rights reserved. Danfoss Inc. Danfoss Inc. Toronto, ON Tel.: 905-285-2050, Fax: 905-285-2055 www.na.heating.danfoss.com Baltimore, MD Tel.: 443-512-0266, Fax: 443-512-0270 www.na.heating.