Chevy & GMC Vans

Cobra,

I converted my house to hot water heat from forced air back in '85. I installed a used boiler originally and had to replace it 3 years ago with a new one. In both systems the circulation pump returned the cooled water to the boiler; it's just the opposite of what you'd think it would do. The original pump was a Bell and Gossett--it was a motor coupled via springs to the pump. The springs went belly-up shortly after I installed the boiler, so I replaced the whole thing with a Grundfos 1 piece pump. Although the Grundfos was tiny compared to the Bell and Gossett, the distance between the pump flanges is the same for both pumps, so the new pump bolted right in with no problems.

The Grundfos pump has an arrow cast into the pump convolute to indicate the direction of water flow. I seem to recall the the Bell and Gossett did too. You could verify pumping direction if you can find the arrow (assuming your pump has one). But, like I said, both of my boiler setups returned the water to the boiler. I pretty sure that yours is the same.

funny a lot of the system diagrams i've seen the specified flow direction showed the pumps pulling the water from the boiler (oh well) mine is pulling the cold water from the two zones like yours.
I still need to know what that stupid control box is called i couldn't find it on the net anywhere. Oh while i was typing this i found the cover for it there is some info on it lets see if i can use it...

Cobra,

What I see in the photo you posted is the 24v transformer and the pump relay. The transformer reduces the 120 vac from the house down to the 24 vac that the thermostat, zone valves, and boiler gas control uses. Let me get into my hydronic books tomorrow and I'll post what I find.

SafariRob: you are right on the money the one that is still working is a honeywell ra89a1116, i believe the one that burnt out was a r184. i now know what i have now the hunt begins for either a ra89a (wish i knew what those last 4 numbers mean) or the heavy duty r847a

Sounds like you're on to it, Cobra. I didn't get a chance to dig into my hydronic books tonight due to work. Hey, I'm an old guy and it's past my bedtime!

anyone who still wrenches on a stro can't be THAT old.

only thing that worries me is if i can replace the ra89a with the r847a looks like it will work no problem and will have an extra terminal open to supply power to another pump if required it's voltage is rated the same just it's max amps are higher