Hydronic accessories
Thermal Actuator
Two-wire 24V slow opening thermal actuator (without end switch) for radiant cooling and heating manifolds.
It is compatible with most common manifolds using a standard threaded ring adapter. It comes with a VA10 ring adapter that also works with the Messana manifold (other adapters are available).
The actuator mounts on the manifold loop by snapping onto the pre-installed ring adapter. It is normally closed (NC), when energized, it opens the loop valve to activate the related zone.
The actuator mechanism is based on a PTC resistor-heated elastic element and a return compression spring. When the elastic element is heated by applying the nominal 24V voltage to the PTC resistor, it expands and moves an integrated plunger to open the valve. When the PTC resistor is no longer energized, the elastic element shrinks and
the return compression spring moves the plunger back and closes the valve.
Technical specifications
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Model |
Two-wire thermal actuator (without end switch) |
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Part number |
MTANC524 |
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Features |
Easy snap-on installation on standard ring valve adapter (VA10 adapter included) |
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360° installation position and rotation |
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Compatible with the majority of manifold on the market |
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Normally closed (NC) 5 ft of cable compared to standard 3ft |
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Visible blue ring to visually indicate the actuator status (blue ring is shown when open) |
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First-open function (actuator comes partially open, until the first activation, for 6 minutes minimum) |
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5 ft of cable (compared to standard 3 ft) |
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Compact modern design and quite operation |
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Superior reliability with long life expectancy and maintenance-free |
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Over-voltage protection |
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Size and weight
Nominal size (closed)
W17⁄8" [48.4 mm]
L8′ [2438 mm]
H2" [38 mm]
With VA10 adapter (closed)
H 2 3⁄16" (55.2 mm)
With VA10 adapter (opened)
H 2 3⁄16" (55.2 mm)
H +1⁄4" (7 mm)
Weight:
0.27 lbs (123 g) with connection cable
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Valve adapter |
VA 10 spacer ring (M30x1.5) (included with the product) |
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Material |
Polyamide |
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Color and finishing |
Light gray (RAL 7035) |
Power cable
Pop-up blue ring
status indicator
Ring valve adapter
VA 10 (M30x1.5)
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Operating voltage |
24V AC/DC, +20%…-10%, 0-60Hz |
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Electrical connection |
20 AWG (0.75 mm2) 2 conductors, blue (0 V) and brown (24 V) with 5 ft gray cable |
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Operating power |
1 W (to maintain the valve open) |
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Max. inrush current |
< 300 mA during max. 2 min. (Max power 6W) |
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Max temperature |
200 °F @ 40 psi [90 °C @ 3 bar] |
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Voltage surge strength |
15 – 60 psi [1-4 bar]2.5 kV (according to EN 60730) |
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Stroke |
1⁄4″ (7.0 mm) |
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Actuation force |
100 N +5% |
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Closing and opening times |
Approximately 3 minutes |
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Fluid temperature range |
36 °F to 210 °F (2 °C to +100 °C) |
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Flow gauge range: |
0 to 1.32 gpm [0 to 5 l/min] with marks every 0.25 gpm [1 l/min] |
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Storage temperature |
0 °F to 140 °F (-18 °C to 60 °C) |
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Operating temperature |
32 °F to 140 °F (0 °C to +60 °C) |
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Min. height clearances |
2 1⁄2 (65 mm) |
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Ingress protection |
IP 54 (class III) in all installation positions (equivalent to Nema 3s) |
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Packaging |
Size (LxWxH): 3″ x 2″ x 31⁄2 (75x50x90 mm) Weight: 0.3 lb (140 g) Instruction are printed inside the box |
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Notes |
Size, weights and technical characteristics may vary without prior notice. |
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