CG400 tied to an old MM Feeder, glitch

GW · December 2018

Hey all i'm perplexed, changed a boiler today, told the gentleman i would connect to the existing old school 24v feeder.

I set up a relay and a trans, in order to separate the lwco from the old feeder- I don't want the boiler sending power to the old dog.

Inside the CG400 I grabbed 2 and A for the relay. It's a RIB, I love the tiny light bulb.

The issue is the lwco won't drop out the A when the water level has been met/re-filled. The light on the CG400 does indeed go out, but the RIB light stays on (getting power from A) and the boiler overfills by a large margin.

Thanks for any tips. I did the same thing a few years ago--I didn't really any glitches. Although, that job 3 years ago was a 110v feeder, and this one is a 24v feeder. That doesn't matter anyway, it's still a RIB on both jobs.

EBEBRATT-Ed · December 2018

Don't know. Hydrolevel says not to use a solenoid type feeder why I don't know. Plus you have it isolated it with a RIB. Seems like it should work.

Just thinking out loud your 24 v comes from 2 common and A hot to the coil of the RIB which would be yellow/white common and blue/white hot. I am sure you have the black/white coil wire taped up.

The 1 leg of your 24v runs through yellow and orange contacts to the feeder.

I am sure it would be worth a phone call to Hydrolevel.

Boiler grounded?

GW · December 2018

Yes to all of that, RIBs are the bees knees. I don’t remember the wire coloring very well (yes I have two wires capped off independently). But I’m quite positive it’s wired properly. I’ll give Hydrolevel a buzz tomorrow unless anyone else can chime in

Steamhead · December 2018

It'll never work that way. Problem is, probe LWCOs have a delay when they sense water after a low-water shutdown, to verify that the water isn't going away. Also, when you power up a probe LWCO, it self-tests, which energizes the feeder terminal.

There are two solutions:

1- install a delay-on relay between the LWCO and the feeder, setting the delay for at least 30 seconds, or

2- replace the feeder with a VXT.

I prefer the latter, because the VXT has the digital display that tells how many times it has fed water.

GW · December 2018

Ok but it’s the overfill that’s getting me.

Steamhead · December 2018

That's what's causing the overfill. You need to delay the feeder coming on to avoid it.

GW · December 2018

i'll give that a try

CG400 tied to an old MM Feeder, glitch

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