Motorized Valve Actuator (MVA), four-wire Zoom

Motorized Valve Actuator (MVA), four-wire

SKU:A3020522

Brand: Uponor (Wirsbo)

Uponor (Wirsbo)
A3020522 has been discontinued.
Direct Replacement:
SKU: A3010522
Brand: Uponor (Wirsbo)
0

Resources

Specs

Application: Zoning
Voltage:
?
24v
24v
Operating Range: 24V +/- 10% VAC
Max Close-Off PSI: 17 psi/39.2 feet of head
Wiring: Four-Wire
Type: Motorized
Max Number of Actuators: 6 MVAs (50VA transformer)
9 MVAs (75VA transformer)
12 MVAs (100VA transformer)
Accessory For: TruFLOW Manifolds
Current Draw Range: 0.29 Amps

Description for Uponor (Wirsbo) A3020522

The Motorized Valve Actuator (MVA) (24VAC) features quick-opening motorized valve head that mounts directly onto 1-1/4" Brass and TruFLOW Valved Manifolds. The open/close indicator allows for easy visual inspection. It provides individual flow control on a multi-zoned manifold (manifold serving more than one zone). MVA includes end switch for activation of relay (pump), heat plant or other auxiliary devices. Power-open, spring-closed, do not mount actuators upside down.
Note: The MVA is not compatible with the Wirsbo Genius control system.

Motorized Valve Actuator (MVA), four-wire

REVIEW SNAPSHOT®

by PowerReviews
Uponor (Wirsbo)Motorized Valve Actuator (MVA), four-wire
 
4.4

(based on 22 reviews)

Ratings Distribution

  • 5 Stars

     

    (15)

  • 4 Stars

     

    (4)

  • 3 Stars

     

    (1)

  • 2 Stars

     

    (1)

  • 1 Stars

     

    (1)

95%

of respondents would recommend this to a friend.

Pros

No Pros

Cons

No Cons

Best Uses

No Best Uses
    • Primary use:
    • Personal (16), Business (5)

Most Liked Positive Review

 

Wirsbo MVA have good track record

We have radiant floor heating in 23 homes. Each home uses one Wirsbo MVA for each heating zone. With an average of 4 per home have a total of about 100 heating zones thus...Read complete review

We have radiant floor heating in 23 homes. Each home uses one Wirsbo MVA for each heating zone. With an average of 4 per home have a total of about 100 heating zones thus 100 valves. The system was installed 11 years ago. Over the last 5 years we have replaced 10 Wirsbo MVA's. I expect to replace a few each season. When they die they tend to stay open so the heat runs constantly. We keep 3 in stock at all times. They take about 10 minutes to install. No need to call the plumber. 90% of the valves have been working for over 10 years. I think that's pretty good. We'll replace as necessary. I'd love it if they would work forever but I guess I need to be real about this.

VS

Most Liked Negative Review

 

Easy to install

I use the product as part of my home heating system. The valves are easy to replace and the price from Pex Supply is the best around. Unfortunately the valves need replacing about every...Read complete review

I use the product as part of my home heating system. The valves are easy to replace and the price from Pex Supply is the best around. Unfortunately the valves need replacing about every two to three years. I don't think they're sealed and internal corrosion makes them malfunction.

Reviewed by 22 customers

Displaying reviews 1-10

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1.0

Be prepared to replace every 2-3 years

By Jim

from PA

Comments about Motorized Valve Actuator (MVA), four-wire:

Works fine but have to replace every 2-3 years.

 
3.0

MVA for Radiant Heating

By donmac

from Whidbey Island, Washington

Verified Buyer

Comments about Motorized Valve Actuator (MVA), four-wire:

Used for zone control in a radiant heating system with 8 MVA valves. All valves have been replaced once. We are now starting to replace the last Wirsbo's with the blue Uponor's. System is 15 years old this October.

The MVA's work good for about 5-7 years. Then the small motors begin to fail or the end switch to the pump fails closed.

  • Primary use:
  • Personal
 
5.0

they work like they are supposed to

By swede

from hot springs village arkansas

Verified Buyer

Comments about Motorized Valve Actuator (MVA), four-wire:

easy to use easy to trouble shoot

  • Primary use:
  • Personal
 
5.0

Very good product.

By Mal

from Newaygo, MI

Verified Buyer

Comments about Motorized Valve Actuator (MVA), four-wire:

Product works very well.

  • Primary use:
  • Personal
 
5.0

Quick acting

By Sears6341

from Beecher Il

Verified Buyer

Comments about Motorized Valve Actuator (MVA), four-wire:

Works great, replacement for a MVA with bad end switch so we will see.

  • Primary use:
  • Personal
 
5.0

Valve Actuator

By Hillbilly

from outback Mn.

Verified Buyer

Comments about Motorized Valve Actuator (MVA), four-wire:

simple screw it on, hook up 4 wires. 2 min time floor heat is up and running, floor is worm again, saved a pile of money

  • Primary use:
  • Business
 
4.0

Fills the bill.

By Steve

from Montrose, CO

Verified Buyer

Comments about Motorized Valve Actuator (MVA), four-wire:

One of the motorized valve actuators in our heating system failed. I ordered this part as a replacement and it works perfectly.

  • Primary use:
  • Personal
 
4.0

Just like picture, different color is al

By Vic

from Orcas Island WA

Verified Buyer

Comments about Motorized Valve Actuator (MVA), four-wire:

This was a easy replacement would recommend to any homeowner.

  • Primary use:
  • Personal

(0 of 1 customers found this review helpful)

 
5.0

Purchase process was great...

By Walt

from Ocean City, MD

Verified Buyer

Comments about Motorized Valve Actuator (MVA), four-wire:

The system works great but more important is the quality follow up processes if your need replacement parts. There are real people who talk to you that help you with technical questions, installation adjustments, who will call you back when there are upgrades. All done quickly, they know that time is important and respect you time. They are great....

  • Primary use:
  • Business
 
4.0

PexSupply exceeded ecpectations.

By Fred G. (for great) Sanford

from Loveland, CO

Verified Buyer

Comments about Motorized Valve Actuator (MVA), four-wire:

Installation is simple and straight forward. The directions mention that the manifolds should be balanced. It would have been helpful to have instructions on how to balance the manifolds - I'm a handy homeowner, not an experienced radiant floor installer.

  • Primary use:
  • Personal

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Q&A: Ask the Questions, share answers

Do you have questions about this product?

Get answers from real customers and in-house experts with AnswerBox.

14 Questions | 28 Answers
Displaying questions 1-10Previous | Next »
  • Motorized Valve Actuator (MVA), four-wire

    Q:

    Hi- So I think a couple of these are shot on my setup, the thermostat calls for heat and the actuators don't do anything. My question is, can I unscrew them and put a new one one without water leaking out? like some others - mine are mounted upside down...
    Asked on 10/24/2013 by Nancy the Newbie from Barstow, CA

    4 answers

    • VERIFIED BUYER

      A:

      Yes. The valve is always closed. The actuator pushes it open.

      Answered on 10/24/2013 by Anonymous
    • VERIFIED BUYER

      A:

      I can't get the "simply answer" icon to respond, but yes, you can unscrew the MVA without causing a leak. The valve which the MVA attaches to will remain closed.
      sam

      Answered on 10/25/2013 by Anonymous
    • VERIFIED BUYER

      A:

      No water leaked out when I replaced mine. The valves are sealed, even when
      you manually push down (up in your case I guess) on the valve pin (like the
      actuator would do) to open it with the flat portion of a flat blade
      screwdriver, no water came out. I have about 16 actuators and only a couple
      have gone bad after 10 years, I would make sure you are getting voltage to
      them before you start replacing. I've had more trouble with the internal
      switch in the actuators going bad and not completing the circuit back to the
      circulating pump than the actual actuator not plunging. Good luck.

      Answered on 10/28/2013 by Anonymous
    • VERIFIED BUYER

      A:

      I bought a couple of these and yes I replaced them without any water coming out. However, it might depend on your system. Might want to have the boiler off when attempting to be sure.

      Answered on 10/29/2013 by Anonymous
  • Motorized Valve Actuator (MVA), four-wire

    Q:

    I have a Wirsbo Valve Actuator part number A 4024F NC that has failed and I need to replace it. Is this one the replacement part now?
    Asked on 7/3/2013 by Brian from Breckenridge CO

    2 answers

    • VERIFIED BUYER

      A:

      It sure looks like the same actuators in my Wirsbo system.

      Answered on 7/3/2013 by Anonymous
    • VERIFIED BUYER

      A:

      After 7-8 years & 2 failures, I've changed my original MVAs to p/n A3020522 which works great with my system.
      Sam
      Oriental, NC, US

      Answered on 7/5/2013 by Anonymous
  • Motorized Valve Actuator (MVA), four-wire

    Q:

    I would like to controll 2 MVA with 1 thermostat is this possiable
    if so How
    Asked on 3/12/2012 by Anonymous

    1 answer

    • CUSTOMER CARE

      A:

      It is possible. You would need to tie (or "piggyback") the wires of the two actuators together and plug them into the same port on your zone control.

      Answered on 3/13/2012 by PexSupply Staff from NY
  • Motorized Valve Actuator (MVA), four-wire

    Q:

    I need to replace my Wirsbo MVA. The one I have is green in color part # A3020522. Isee the one on your web site is blue in color with the same part #is this the same part?
    Asked on 3/7/2012 by Buddy from Hawley Pa.

    7 answers

    • VERIFIED BUYER

      A:

      We replaced our original green-covered valves with the blue ones about 18 months ago. They are the same in function & are doing fine.
      Sam Myers
      Oriental, NC

      Answered on 3/7/2012 by Another PexSupply Customer
    • VERIFIED BUYER

      A:

      Yes it is the same one. Change in color might be the updated model.

      Answered on 3/7/2012 by Another PexSupply Customer
    • VERIFIED BUYER

      A:

      I've replaced several, they've gone from green to blue now. They appear to be the same......Lake City, MI

      Answered on 3/7/2012 by Another PexSupply Customer
    • VERIFIED BUYER

      A:

      I have replaced several of the Wirsbo MVA (green) controllers with the newer
      model that is blue in color. The replacement was easy and the new units
      functioned equally as well as the original.

      Answered on 3/7/2012 by Another PexSupply Customer
    • VERIFIED BUYER

      A:

      I just replaced my green colored MVA with Blue colored ones and they seem to
      be exactly the same and working fine.

      Answered on 3/9/2012 by Another PexSupply Customer
    • VERIFIED BUYER

      A:

      Yes.
       

      Answered on 3/9/2012 by Another PexSupply Customer
    • VERIFIED BUYER

      A:

      I believe that it is the same - we replaced several and these have worked great !
       
      .

      Answered on 3/9/2012 by Another PexSupply Customer
  • Motorized Valve Actuator (MVA), four-wire

    Q:

    Is there an approved solution for mounting actuators upside down? The manifold in my house has the fittings mounted that way, and it would be very difficult to change it.
    Asked on 12/24/2011 by Anonymous

    1 answer

    • CUSTOMER CARE

      A:

      We don't see how you'd be able to mount the actuators upside down without having water running over the actuators (which is a safety hazard).

      Answered on 1/20/2012 by PexSupply Staff from NY
  • Motorized Valve Actuator (MVA), four-wire

    Q:

    what happens if the actuators are installed upside down
    Asked on 12/13/2011 by johnnymack from new york

    2 answers

    • A:

      The manual says nothing about what happens when the MVA is installed upside down, but explicitly says to only install it on it's side or upright. Seeing as it is motorized, it seems it will not function properly and will degrade the time in which it lasts.

      Answered on 1/3/2012 by Anonymous from None
    • CUSTOMER CARE

      A:

      The actuators would still work, but installing them upside down is not recommended. Water should never run on top of electric because any leaks could result in a fire.

      Answered on 12/16/2011 by PexSupply Staff from NY
  • Motorized Valve Actuator (MVA), four-wire

    Q:

    I have a number of these valves in my residence that have the Wirsbro name on them, but otherwise functionally identical. I have had to open every one of them due to corrosion on the contacts of the end-switch contacts. It makes just enough contact to light the LED in the Zone controller, but not enough to trigger the remote end-switch at the pump controller. (You can actually see the LED in the zone controller glowing slightly dimmer.)
    Is there any upgrade to a better switch inside these valves? Although the switches are rivited to the chassis, I have been able to drill out the rivit and open the small switch in order to clean the contacts. Happens about every other year.
    Anyone have any ideas?
    Asked on 11/20/2011 by Dennis from Saranac, NY

    2 answers

    • CUSTOMER CARE

      A:

      We have never heard of this issue before. We know that you have to make sure your transformer is strong enough to power all your units. If you do not have enough power, it will cause the units not to work correctly and the control boards to go dim.

      Answered on 11/23/2011 by PexSupply Staff from NY
    • A:

      I have the same problem. Good switches read close to 0 ohms when closed. Bad switches read between 5K and 30K. At least 3 out of 5 in my system are bad right now.

      Answered on 12/28/2011 by Alan from Bethlehem, PA
  • Motorized Valve Actuator (MVA), four-wire

    Q:

    I seem to have about 3 of these MVAs fail each year. They seem to snap back at the base so that the threads are still on the pipe but the main body of the MVA is hanging back off the pipe...
    Asked on 11/19/2011 by Keith from NJ

    1 answer

    • CUSTOMER CARE

      A:

      We recommend that you follow the directions when installing the actuators. You can over-tighten the actuator and cause it to snap.

      Answered on 11/23/2011 by PexSupply Staff from NY
  • Motorized Valve Actuator (MVA), four-wire

    Q:

    Is there any functional difference between A3020522 and SKU:MZV520-RP?
    Asked on 10/10/2011 by Chuck from Minnesota

    1 answer

    • CUSTOMER CARE

      A:

      There is no functional difference between the two actuators.

      Answered on 10/18/2011 by PexSupply Staff from NY
  • Motorized Valve Actuator (MVA), four-wire

    Q:

    Are these MVA's the correct replacement parts for the old Wirsbo thermal telestats (installed 1995). The screw on adaptor on these MVA's looks the same as the old telestats adaptor. Also do I need to drain any or all of the water out of my system before removing the old telestats off of the mainfold and can a 3 valve mainifold still work with 1 broken telestat removed from the manifold as I get no flow through the broken telestat?
    Asked on 4/22/2011 by Vic from Abq, NM

    2 answers

    • CUSTOMER CARE

      A:

      If your manifold is from 1995, it more than likely has 'Wirsbo' stamped on the cast brass body. If this is so, then you can replace with either the A3020522 Motorized Valve Actuator or the A3010522 Thermal Actuator. You will need to drain the water out of your system.

      Answered on 4/26/2011 by PexSupply Staff from NY
    • VERIFIED BUYER

      A:

      They are direct repacement parts for the old Wirsbo telestats.You do not have to drain any water from system.Just disconnect old telestat and install new one.
      The system will work with the broken telestat removed. Water will
      flow when the working telestats call for heat. You will not be able to contol the temperture of the disconnected zone but it will
      work when the other zone do.

      Answered on 6/3/2011 by mikey from Chicago, IL.
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