hydronic water quality

ScottMP

Of this circulator.

This is about six years old, Peerless gas fired, power vented, with four zone valves.

Customer said the circulator was making a whining noise. This is what we found. If you look close you can see the shiney spots where the impellor was hitting the build up, of what I assume is a iron sludge.

Scott

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This is why

I hammer so much about water quality and treatment.

What type of distribution system? Piping material? Operating temperatures? Fill system on, or off?

Check for leaks, sure looks like a problem caused by continous make up water. But if the system ran without a good purger, the O2 could cause this much damage even without additional fresh water.

Clean em and treat em, or be prepared for a lot more of this. Especially on lower temperature systems.

Fairly typical fill water ay 60°F has an O2 of 10ppm. At 140°F 4.72. At 180°F look for 2.7.

A good inhibitor needs O2 scavangers, ph buffers, azoles for copper and brass protection, a plating chemical, and a dispersant for scale and sludge control.

A good cleaner before final fill will get rid of oils and flux residue and remove any food source for bacteria to get a hold of.

I have a shelf full of components that look like that. Some after only two years service!

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The boiler

wonder what it looks like inside? Efficiency? Good thing you didn't mention the serial number

Sure like to see the boiler mans recommend some adequate cleaning methods and product choices. What %s of the residential boilers out there are looking like this, do you suppose.

Give them a new boiler and split that old one open! We'd all like to see that innards.

Tick, tick, tick

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ScottMP

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This is a copper finned baseboard system with no reset. Three zones of heat and one indirect, so this unit does not have a long down period. That means this build up happened with a running circulator. I know I was shocked to see it.

Not only could you here the pump screaming but I could feel poor circulaton when I first got the call. My thoughts also went to the cast iron block and its condition.

How sad.

Scott

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Like I always say

it didn't ship from the factory looking like that

If you haven't found something wrong, something ain't right.

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