- This topic has 3 replies, 4 voices, and was last updated 21 years, 3 months ago by jack spotz.
6 Apr 2000 at 12:44 pm #272796MasterPlumbersKeymaster
Over the past 6 Years I have had to replace 3 valves in a 8 year old boiler system (there are two zones). The motors keep burning out. I have been told it’s the power and/or the hard water (there is no water softener). What are my options? I checked into a boiler additive. In a sealed system, how do you get the additive in the system?
6 Apr 2000 at 1:51 pm #286328hj
Hard water is only hard until it is heated and then the minerals precipitate out inot the boiler. And in a closed system, the initial water is the main contributor, since makeup water is a minor factor. If you are replacing motors, maybe you should be checking the valves to see if they are binding and overloading the motors. To get an additive into a closed system, you either have to inject it under pressure or drain the system down to a level where you can pour it into an opening on the boiler.
6 Apr 2000 at 9:26 pm #286329SylvanLMP
Most residencial zone valves are GARBAGE. I would opt for a B&G /Armstrong series 100 circulator and use NON Electric Zone valves to fine tune each radiator if your lucky enough to have Cast Iron radiators/ baseboard and a two pipe system .
If you have that cheap copper fin stuff your still better off with a seperate circulator for each zone BUT figure your velocity as to not cause any erosion as hot water above 180 degrees should have a max velocity of 2-3 FPS.
The only way for HARD water to make any difference in your hydronic system is if you bleed the system alot ( not a good thing to do) OR you have some leaks going undetected.
Normally once the water is heated the oxygen is boiled out and any mineral deposits stick to the hottest part of this system (boiler).
If your area is prone to erotic voltage drops/increases AND your zone valves are line voltage this could be a problem. You may want to check your step down transformer to make sure your getting the recommended voltage your valves require if your using low voltage valves actuators.
A loose wire could also account for this type of valve failure.
Before you even think of adding any additives you had better check with the boiler Manufacturer as some chemicals have an adverse reaction to the elastic seals some boilers manufacturers use today
(“O” rings corroded)
If you indeed have hard water that is destroying your zone valves YOU HAD BETTER CHECK YOUR RELIEF VALVE ASAP for proper operation, See ASME section IV for details good luck.
[Edited by SylvanLMP on 06 April 2000]
7 Apr 2000 at 3:27 am #286330jack spotz
boy that guy gives me a headache! honeywell does sell just the replacement motor for this valve, it’ll save you $$. some of those motors last 15 years and some only a couple, it’s alot cheaper than repiping the whole mess though. i dont have the part# for the motor but if you want it, e-mail me.
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