3/4" Thermal Zone Valve, four-wire Zoom

3/4" Thermal Zone Valve, four-wire


Brand: Uponor (Wirsbo)

Uponor (Wirsbo)
A3010525 has been discontinued.
Please contact customer service at
(888) 757-4774 for help finding an alternative.



Type: Zone Valve
Size: 3/4"
Connection Type: Sweat
End Switch: Yes
Height: 4"
Width (Inches): 3.3"
Weight (lbs): 1.75 lbs
Flow Capacity (Cv): 5.8
Body Pattern: 2-Way
Type: Thermal
Application: Zoning
Material: Bronze
Max Water Temp (°F): 239°F
Max Pressure (PSI): 125
Max Close-Off PSI: 17.5 psi
Connection Type: Sweat
Operating Current: 250 mA
Operating Voltage: 24 VAC Nominal
Time to Open/Close: 3 to 5 Minutes
End Switch: 24 VAC
2A Resistive
Wiring: Four-Wire
Position: Normally Closed

Description for Uponor (Wirsbo) A3010525

Four-wire Zone Valve (24 VAC) features 3/4- and 1-inch sweat connections. It provides flow control for a single-zoned manifold (manifold serving one zone), and has a built-in flow-balancing feature. The zone valve includes end switch for activation of relay (pump), heat plant or other auxiliary devices. Do not mount actuators upside down.

3/4" Thermal Zone Valve, four-wire


by PowerReviews
Uponor (Wirsbo)3/4" Thermal Zone Valve, four-wire

(based on 1 review)

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Reviewed by 1 customer

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Good zone valve

By Doc

from Brush, CO

Verified Buyer

Comments about 3/4" Thermal Zone Valve, four-wire:

Good valve control. Shuts down water flow with no leaking or sticking.

  • Primary use:
  • Personal

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1 Question | 2 Answers
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  • 3/4" Thermal Zone Valve, four-wire


    I cannot get the valve to "unlock". I connected the 2 red wires to a 24V source for 6+ minutes then disconnected the power. The switch did not close. Tried it several times w/ no luck.
    Asked on 5/20/2011 by Don from Marion, MT

    2 answers



      It sounds to us like the power head is bad and may need to be replaced.

      Answered on 5/24/2011 by PexSupply Staff from NY
    • A:

      Sounds to me like the little shiny metal pin under the actuator might have gotten stuck from not moving for a long time. Try to take of the actuator and push on the pin with a flat hard object. careful not to scratch the pin as that could rouin the valve. Hope it helps.

      Later Kasper

      Answered on 10/15/2012 by 3Cubed from portland, ME
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