Circulator Pump runnin in Short Bursts

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Old 12-05-12, 02:07 PM
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Circulator Pump runnin in Short Bursts

hello again...

my furnace's [boiler's] circulator pump has been running in short bursts only lately...as opposed to full length cycles.

it's a gas-fired hydronic system...a high efficient one w/ a peerless pinacle furnace [boiler].

never experienced this before...anyone have any ideas...???

thanx,


mark4man
 

Last edited by NJT; 12-07-12 at 03:33 PM.
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Old 12-06-12, 07:08 AM
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Have you confirmed that your t-stat is not calling for heat in short bursts?
If it's a digital t-stat, it may be due for battery replacement.

It could be your relay box/aquastate, but start with the simplist fix first.

btw, how many zones on this system? If more then one, are they pump controlled or valve controlled?
Is the pump in question controlled by a seporate relay box or by the a-stat?
 
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Old 12-07-12, 12:02 AM
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thanx...

Have you confirmed that your t-stat is not calling for heat in short bursts?
why would it do that...???...I am also assuming that the furnace [boiler] itself runs in a full length cycle

now u have me thinking...IS in fact the furnace [burner] AND the pump running correctly, in full length cycles...& then the pump is running itself, in short bursts, after that cycle...as a supplementary thing...???

oh man

btw, how many zones on this system?
1

ill check the t-stat batteries (AND confirm an answer to my own 2nd question)...& then come back.

thanx,


mark4man
 

Last edited by NJT; 12-07-12 at 03:25 PM.
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Old 12-07-12, 05:59 AM
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I mentioned the t-stat batteries as they are the cheapest and easiest to replace, and often forgotten.
I noticed with my one t-stat that when the batteries where on their way out, I could hear the internal relay (in the t-stat) click on and off occationally while the heat call wasn't yet satisfied.

General rule of thumb in my house is change the batteries in the smoke detectors and the t-stats the same weekend we change the clocks (day light savings adjustments).
 
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Old 12-07-12, 03:29 PM
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assuming that the boiler itself runs in a full length cycle
Mark, not sure what you mean by a 'full length cycle'.

It's only going to do what the thermostat 'tells' it to do.

In other words, if the thermostat is actually kicking in and out for some reason, so will the boiler.

It would not be unusual for a system to have controls which run the circulator for a period of time after the heat call has ended, but what you are describing... 'short bursts' ... doesn't sound normal.

Are you getting no error codes on the display?

Please also take a look at the pressure and temperature gauge (display) and report what you see there at the time that the pump is 'acting up'.

Yeah, observe it a bit more and see if you can come up with a more complete scenario.
 

Last edited by NJT; 12-07-12 at 03:45 PM.
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Old 12-07-12, 03:31 PM
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All manuals for Pinnacle here for reference:

Peerless® Pinnacle®

Mark, what's the full model of the boiler?
 
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