Drain & Refill Gas Residential HWBB

Docfletcher

Acidic condition of Cryro-Tec solution forces the need for drain & refill. Six zone valves and Two circulators with drains above each circulator.

My thought is to drain directly from the gas boiler while forcing water out through one zone at a time by way of the drains above each circulator. In this manor each zone will be left with a full charge of clean water minimizing air. I will not be using Cryo-Tec anymore.

Is this a good way to do it?

I have no way of knowing how much damage the Cryo-tec caused but I am sure it's been acidic for at least six years. Cryotec test strip test came out quite yellow.

Al Letellier_9

draining A/F from system

The only way to do it is to drain and flush every part of the system, and it can take longer than you think. Leaving in just a little can cause contamination and possible growth build up in your system. I would drain and flush and seek out a chemical to add to the system to kill the rest of it. I don't recall who makes it but I seem to remember from my commercial HVAC days that it was available. Also check carefully with local authourity before dumping your anti-freeze down the drain. It may be biodegardable, but may be considered hazardous waste in your area...be careful.

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Docfletcher

Well, I'm thinking each circulator drives 3 zones. Forcing fresh water through each zone by opening, then closing each zone valve in succession should drive all the fluid from the system, about 140 gallons.

I'll add 40oz of Cryo-Tek inhibitor. I'd like to get the PH up to 8.5.

I'd like to know if there is a better way to purge all the old
fluid out. Thanks for your help.