[Technical] NC x NA x NC/NA

Nizza

Nizza

Well-Known Member
I like the little giant brand pumps for what I do in hvac. They seem to be our industry standard, and they do have a 240v model.

Not sure what that NC in my world means normally closed but I don't know what the NA would mean.. as long as you get a pump with the correct voltage
 
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pakist0ned

Well-Known Member
Little Giant is not that easy to find in the EU.

Guess we have too many regulations for US brands :p

But we also have good manufacturers here, being Sauermann one of them ;)
 
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pakist0ned

Well-Known Member
Nizza said:
I like the little giant brand pumps for what I do in hvac. They seem to be our industry standard, and they do have a 240v model.

Not sure what that NC in my world means normally closed but I don't know what the NA would mean.. as long as you get a pump with the correct voltage
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It should be:
NC - Normally closed
NA - Normally open
NC/NA - I have no idea

But what do these mean?? Do I want normally closed? Or normally open? Or the last one?
 
Nizza

Nizza

Well-Known Member
pakist0ned said:
It should be:
NC - Normally closed
NA - Normally open
NC/NA - I have no idea

But what do these mean?? Do I want normally closed? Or normally open? Or the last one?
Click to expand...
Does your dehumidifier have a terminal with a jumper wire on it called FLOAT?

The pump operates like this-- it has a primary float switch that energizes the pump when it goes up, and shuts off when it drops.

The secondary float above that is usually a normally closed 2 wire 24vac for low voltage. If the pump were to shut off or break, this float now goes up and breaks (opens) the circuit. You take the 2 wires from that float (which will be sticking out and have no voltage coming from them) and remove the float jumper from the dehu and put the 2 wires on those two terminals. Sometimes there is a switch too on the dehu that allows u to set it to normally closed or open as well.

To test it just wire up the low voltage on the pump and turn the dehu on. Flip the pump upside down with no water in it and see if the dehumidifier shuts off

I'd go with the normally closed one. I bet the last one you can change if it's normally closed or open
 
Nizza

Nizza

Well-Known Member
On a side note I have installed these Sauer pumps and I didn't like the 1/4 turn check valve ejection port. It is such a bad fail point on the pump and is easy to set the nipple in there wrong to me it could be alot of water spraying out.

Just leave a pigtail on the vinyl tube and cut it off if you can't get the hose off the barb. Little giants are made better IMO
 
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pakist0ned

Well-Known Member
Nizza said:
Does your dehumidifier have a terminal with a jumper wire on it called FLOAT?

The pump operates like this-- it has a primary float switch that energizes the pump when it goes up, and shuts off when it drops.

The secondary float above that is usually a normally closed 2 wire 24vac for low voltage. If the pump were to shut off or break, this float now goes up and breaks (opens) the circuit. You take the 2 wires from that float (which will be sticking out and have no voltage coming from them) and remove the float jumper from the dehu and put the 2 wires on those two terminals. Sometimes there is a switch too on the dehu that allows u to set it to normally closed or open as well.

To test it just wire up the low voltage on the pump and turn the dehu on. Flip the pump upside down with no water in it and see if the dehumidifier shuts off

I'd go with the normally closed one. I bet the last one you can change if it's normally closed or open
Click to expand...
- I don't think my dehumidifier has such a jumper. It is an Infiniton DHM-W20L.

- I'm hoping that if the pump is full (2liter) and can't drain for some reason, the dehumidifier stops as well. Am I hoping wrong? Will it flood my room without that jumper??

Thanks a lot for all your input so far! Huge help!
 
Nizza

Nizza

Well-Known Member
pakist0ned said:
- I don't think my dehumidifier has such a jumper. It is an Infiniton DHM-W20L.

- I'm hoping that if the pump is full (2liter) and can't drain for some reason, the dehumidifier stops as well. Am I hoping wrong? Will it flood my room without that jumper??

Thanks a lot for all your input so far! Huge help!
Click to expand...
I wonder if you could modify it.. there is a switch the tank flips to shut off the unit when the bucket fills up. If I had to guess you could dissasemble this switch and wire it to the NC wires from the pump. The way you could check this is by using a multimeter

set the multimeter to ring out mode (ohms i think)

put the two leads from the multimeter together, it should make a ringing noise. This is what happens if the circuit is closed.

with the dehu unplugged, find where the secondary switch ties into the dehu and put the leads from the multimeter on each side. if it is ringing that means it is normally closed, and then flip the tank float up and see if the ringing stops. This will mean you need a NC style safety switch built into your condensate pump.

Like I said I'd really go with a little giant pump with the built in safety switch over the sauremann. Probably cheaper and definitely better.

Tying the safety switch in is a great idea. The dehu will keep running if the pump fails or something and it will make a big mess. If you don't wanna do all that stuff you could also get a wet alarm that will notify you if water gets on the floor for any reason. Lots of companies make them, I think Inkbird is coming out with one soon
 
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