Pump direction

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  #1  
Old 09-29-13, 03:21 PM
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Pump direction

What are the problems with wrong pump direction? I got my new boiler all hooked up, and even fired it for the first time today, when I realized I have the pump pumping into the supply side of the boiler. I am ASSuming I should change the direction immediately, but what is the harm? (not trying to be defiant, just like to know)
https://plus.google.com/photos/11215...85595049655957
 
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Old 09-29-13, 03:30 PM
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You need to have the return and supply connections as prescribed by the boiler manufacturer. Water in the boiler will tend to stratify - with the warmest water near the top, where the supply connection normally is. The coolest water is near the bottom, where the return connection normally is. The heat exchanger needs to be near the hottest water to help prevent damaging condensation in the boiler and flues.
 
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Old 09-29-13, 03:35 PM
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P.s.

I couldn't view the photo - it tells me that I do not have authority to access it.

In addition to the flow direction issue, many wet-rotor pumps, such as Taco, have prescribed orientations for either horizontal or vertical installations. Instructions should have come with the pump.
 
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Old 09-29-13, 03:46 PM
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ok I think link works now, someone please confirm.
 
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Old 09-29-13, 04:40 PM
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ok I think link works now
I still get a message from Google that I don't have authority to view the photo. But it does give me the option of requesting access approval from the owner, undoubtedly you - which I did. Can you just open it up to the public? There other freebie photo hosting sites other than Google.
 
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Old 09-29-13, 04:50 PM
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give it a try one more time. "Computers make extremely complex problems simple, and simple problems extremely complex"
 
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Old 09-29-13, 04:55 PM
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Parnellk, you must turn the pump around before using the boiler.

Boilers are ENGINEERED for proper flow direction. Even if it doesn't ultimately 'damage' the boiler (and I believe that it could) the boiler will not work properly, and it is HIGHLY likely that you will hear all sorts of awful noises coming from inside... (it has happened to several posters to this forum over the years)

Don't try to second guess... just turn the pump around.
 
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Old 09-29-13, 07:08 PM
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OK, the photo worked for me now. The pump is a 3-piece, dry-rotor type, not wet-rotor type like I discussed the orientation requirements.

Are you sure the pump is installed in the wrong direction? I looks to me from the arrangement of the volute, the pump may be pumping away from the boiler - which is correct if it is connected to the hot-water supply from the boiler. I can't be sure from the photo.

I have never seen a flexible metallic gas connector used for a boiler - always solidly piped. It may be in accordance with your code, though. I don't see a manual shutoff valve ahead of the gas fuel valve - it is required. Sooner or later, you might wish you have a ball valve on each side of the pump - so you don't have to drain the system for pump repairs.
 
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Old 09-30-13, 06:31 AM
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Just out of curiousity, this was a 'self install', right?

Did you pull permits and did it pass inspection?
 
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Old 09-30-13, 07:27 AM
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OK I switched pump direction, it was for sure wrong direction. I do have gas shut off valve, and flex was there before (doesn't make it right) and yes I have ball valve shut off on both sides of boiler (just out of the picture) which made it real easy to change out that pump!
 
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Old 09-30-13, 10:15 AM
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That pump has oilers, right? I hadn't thought of this before - but after flipping the pump, will the oilers will be on the bottom side?
 
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Old 09-30-13, 11:19 AM
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Hmmm...Clearly that is too much pump for that system IMO...



 
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Old 09-30-13, 12:33 PM
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Yes, I kept motor and oilers right side up.
 
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Old 09-30-13, 12:39 PM
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Is that the s 34????

I am curious to how that boiler functions with regards to controls.. I read that control monitors t stat cycles...

What type of heat emmitters do you have if you dont mind me asking?
 
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Old 09-30-13, 01:40 PM
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Disregard and delete this post thanks
 
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Old 09-30-13, 01:53 PM
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SE70 boiler cast baseboard upstairs and cast radiators down. I have a good old fashioned Honeywell thermostat. Now that I have changed direction on the pump, I notice the supply is feeding into the bottom of the radiators and out the top, is that the correct direction? Also because I have concerns about the flame adjustment/gas pressure I have a boiler repair man coming tomorrow to check everything out. (one of the few licensed in Oregon)
 
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Old 09-30-13, 04:25 PM
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I have a good old fashioned Honeywell thermostat.
If it's the round-dial mercury type, hang onto it until the EPA agents come and take it away. Honeywell now makes two other round-dial 'stats to replace the mercury type: one is mechanical, and is lousy, and one is digital, which is fine - just as good as the old mercury 'stats.
 
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Old 09-30-13, 06:48 PM
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cast baseboard upstairs and cast radiators down.

Hmm... big issue. You have no boiler protection... Check your return temps or you will turn that boiler into a hunk of rust in no time...


read here on bypass piping...

http://www.comfort-calc.net/Bypass_P...laination.html
 
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