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Thread: Normally open or normally closed?

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    Normally open or normally closed?

    I'm in the process of adding my pool pump to my home automation system. The technology I use is called Insteon and they have two options for switches. One is normally open and the other normally closed. Which version would I need?
    All I know about my pool at this point:
    Size: 17,000 Gallons - Oval
    Type: Inground - Vinyl - Salt Water
    Filter: Sand
    Controller: Autopilot
    Pump: 1HP Waterway Mustang - Single Speed (MUSTS-110)
    Heater: Aquacal Heat Wave
    Robot: Barracuda G4

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    JasonLion's Avatar
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    Re: Normally open or normally closed?

    Normally open and normally closed tells you what state the switch is in when there isn't power. That shouldn't matter, since if there isn't power the pump is off regardless. The unit will go back to it's previous state as soon as power is restored. I would get normally open, as that is slightly safer, but again it shouldn't make any difference.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Mod Squad Bama Rambler's Avatar
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    Re: Normally open or normally closed?

    You need the normally open contacts.
    Normally open means that in a de-energized state (no signal from the control system) the contacts are open and not passing power.
    Which relay are you planning on getting?

    Most insteon relay devices are only rated for resistive loads. Motors are inductive loads. What I recommend is an appliance module with the ELK relay to power the pump. Here's a link to the relay. It's rated for motor loads and will be better suited for your application. If you decide not to use this one you should use a relay with a snubber to power the motor.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Normally open or normally closed?

    Thanks for the quick feedback. This is the one I ordered:

    http://www.smarthome.com/2477SA1/INSTEO ... and/p.aspx

    Thoughts?
    All I know about my pool at this point:
    Size: 17,000 Gallons - Oval
    Type: Inground - Vinyl - Salt Water
    Filter: Sand
    Controller: Autopilot
    Pump: 1HP Waterway Mustang - Single Speed (MUSTS-110)
    Heater: Aquacal Heat Wave
    Robot: Barracuda G4

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    Mod Squad Bama Rambler's Avatar
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    Re: Normally open or normally closed?

    That's the relay I figured on. While it's not rated for inductive loads it'll probably last a long time running your pump.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Normally open or normally closed?

    Quote Originally Posted by Bama Rambler
    That's the relay I figured on. While it's not rated for inductive loads it'll probably last a long time running your pump.
    Hmmmm.... I just assumed that gray enclosure meant it was the outdoor type but it says in the spec it is indoor rated. Looks like the unit is about 8X8 square. Any suggestions on a box to put it in? I assume it won't fit easily in a 2 gang box. I'd also like a clear door on the front of the unit and preferably the box would be plastic since it is an RF device as well as powerline. A metal box might interfere with the RF, but if there's no other option it'll probably be fine on the powerline.
    All I know about my pool at this point:
    Size: 17,000 Gallons - Oval
    Type: Inground - Vinyl - Salt Water
    Filter: Sand
    Controller: Autopilot
    Pump: 1HP Waterway Mustang - Single Speed (MUSTS-110)
    Heater: Aquacal Heat Wave
    Robot: Barracuda G4

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    Mod Squad Bama Rambler's Avatar
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    Re: Normally open or normally closed?

    The specs are 8" x 5" x 7 3/8"! That's a pretty large device.

    You can get a clear covered enclosure. Your best bet is probably Ebay.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Normally open or normally closed?

    How did you make out installing this product. I am think of purchasing the same item for my pool pump.

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    Re: Normally open or normally closed?

    I just automated my pump with a Z-wave hook up.
    Basically I'm using a Z-wave outlet in a external enclosure. That switch a 24v power adapter that controls a relay which turns the pump on r off. It's wired in before the mechanical timer and I just leave the on/off thingys on the timer off. This way if I'm at the pump I can manually turn it off to back wash or whatever I need to do. Been working great for a month now. I did something similar with the switch for the spa Jet blower. This way if I'm in the spa I can turn the blower on or off with my Droid or G tab or whatever is next to me. It's fun!

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