Bosch Therm 660 EF makes horrible noise in simple radiant heat system

[beenthere]

Ya I kinda figured that, they must have to use there area for an application, can't remember it's been awhile.

There is an IP icon on my screen on every post anyone makes. Doesn't matter where or what computer you use to make the post, the IP of that computer is recorded with that post.

[Joehvac25]

There is an IP icon on my screen on every post anyone makes. Doesn't matter where or what computer you use to make the post, the IP of that computer is recorded with that post.

Oh ok I get it.

[Greg555]

Why 50/50?

Looking at my handy chart (I deal in industrial chillers at my work):
25% = 14F
30% = 10F
40% = -6F
50% = -28F

Keep in mind the pipe burst rating is much lower temps. Meaning the freezing point is when the liquid is sitting in an open bucket and starts to turn into slush. Slush won't pump, but it won't destroy piping. 24% will get your burst protection to 0F, which is probably all you need.

http://msdssearch.dow.com/PublishedL...romPage=GetDoc

To be honest, most cars probaly don't need 50%, but they are some and operated in such a wide range of location, that they play it safe. FWIM, we use 20-25% in our chilled water system so we can run 32F water temps, keep CW coils in 100% outside air handler from bursting if hte pumps or steam reheat fails, and lastly, I think 15-20% is needed ot prevent bacteria growth... obvisouly not an issue in a hot water boiler that runs over 120F.

Maybe just try dropping the glycol percentage and see what happens.

I guess I didn't think much about it.

Lowest I seen my thermocouple buried in Concrete showed 32F

[motoguy128]

It just depends on what you're trying to accomplish and your location for ground temepratures. But I figured since the glycol might be part of the problem, it wouldn't hurt to reduce it.

[Greg555]

It just depends on what you're trying to accomplish and your location for ground temepratures. But I figured since the glycol might be part of the problem, it wouldn't hurt to reduce it.

I will delute is to 20-25%

Im in Chicago

[Greg555]

Hello again.

I wanna thank everyone for their suggestions (except toocoolforschool )

I changed the pump to 11, diluted the coolant and is been running fine for the last 3 hours.

I hope its gonna be OK. Definitely a lot better. No noise but need to test more. I guess it was a combination of flow and coolant boiling.

Thanks again and hope didn't get anyone in trouble

Greg

[toocoolforschool]

Yea I'll be the bad guy here, even though the op kept insisting for diy instructions, that's why I'm the boss. I know it sounded a little rough but I just put it in plain english no harm intended.