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I am reading this right.....

Spring Return Valve Actuator w/ 135 lbf force, Stem down on power failure
Honeywell ML6425A3022

Shouldn't this operator be power open and then close on its own. We received 3 of these and they were all power open and power close. Had to spend another day adding relays and rewiring to get them to close.
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Comments

  • retiredguy
    retiredguy Member Posts: 682
    edited February 2020
    According to Honeywell the ML6425A 3022 drives up with power and drives down when the power is removed. Make sure you got the right ones and if you have questions call the listed phone number for help.
  • ScottSecor
    ScottSecor Member Posts: 642
    Since I've been in the business, it's been normally open for commercial valves, and normally closed for residential valves. Maybe Honeywell has changed things?

    I was under the assumption that in a commercial application (public school for example) that if a hot water zone valve failed over the weekend that it would fail in the open position, preventing the coil in the classroom from freezing. Along these same lines, on a residential application (house) that the homeowner would notice a cold living room and call a contractor.

    I suspect your actuator is for a commercial job, so no it doesn't make sense to me why it normally closed.
  • The Steam Whisperer
    The Steam Whisperer Member Posts: 1,084
    I thought I was reading the spec right....they are supposed to power open only and then the spring closed. These actuators are power open and power closed.... 3 wire. Another Honeywell screw up that cost us about $1200.00 in labor and additional materials. So far this fall/winter, 2/3 of the boilers/boiler burners we installed had defective components. Castings, flame sensors, flame control modules ( Honeywell), pressuretrols ( Honeywell), low pressure gas safety valves, mis labeled control valves..... It seems that quality control is reaching all time lows.
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  • ratio
    ratio Member Posts: 3,332
    They're floating spring return. As long as T1 (common) & T5 (hot) have 24 VAC power, it responds to 24 VAC applied to B by stroking open & W by stroking closed. Loose the power to T5 & it'll spring shut.

    To use it as a power open spring closed actuator, power T5 & B together via a jumper to open; it'll spring closed when power is removed.

    Assuming, mind you, that stem down is closed. NB: I can never remember which direction is B & which is W, so I always have to verify in the field.

  • Gordo
    Gordo Member Posts: 826
    Problems with Honeywell? I was told that Moneywell was split in two recently, one side residential, one side commercial. The residential side seemed to stay on course and got their products out the door more or less on time and seemed to maintain their "quality standards" such as they are.

    The commercial side was another matter, or so I was told. Details are sketchy, but suffice it to say it was a disaster. Little went right, the upshot being that product (you name it) was in some cases months behind. It is not difficult to imagine that quality standards suffered a tiny bit in the interim.
    All Steamed Up, Inc.
    "Reducing our country's energy consumption, one system at a time"
    Steam, Vapor & Hot-Water Heating Specialists
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    ratio
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 13,112
    There's some weird stuff around. I had a couple of Belimo actuators the service manager ordered them I told him i wanted power open --spring closed. The ones he ordered were throwing me for a loop. They were 2 wire 24v hot and common from the thermostat, supposed to be power open-spring closed......but they had no spring.

    Turns out they were ok. You power it open on a call for heat and it stores power in a internal capacitor. When the stat opens the capacitor drives them shut.

    You could also set them to fail open or closed
  • ch4man
    ch4man Member Posts: 288
    ratio said:

    They're floating spring return. As long as T1 (common) & T5 (hot) have 24 VAC power, it responds to 24 VAC applied to B by stroking open & W by stroking closed. Loose the power to T5 & it'll spring shut.

    To use it as a power open spring closed actuator, power T5 & B together via a jumper to open; it'll spring closed when power is removed.

    Assuming, mind you, that stem down is closed. NB: I can never remember which direction is B & which is W, so I always have to verify in the field.

    blue=BTU ie: heat, white, W=cool
    yeah backwards from series 80 controls..
    i drive by Residio, err i mean Honeywell here and there in the Mpls area and yeah, Residio.... not the same company