Peerless Boiler, Controller Temp Lower then Boiler Temp

Paul986

New User

Peerless Boiler WBV-E-04 with Indirect Hot water Heater, 5 Zones with Baseboard Heat. New install in Feb 2022.

Problem;

The Controller seems to be reading a good 12 degrees or so Lower then the Boiler Gauge. Don't know which is correct. The installer says I'm over thinking it and not to worry cause all Peerless Boilers do this.

This came up cause we're having trouble heating the Home when the outside temp gets below 25F or so.

I know it could be other issues but I thought if the controller is calling for 190 and the boiler is only putting out 178 +/- the base boards aren't really heating as they should.

Thanks for any help
Paul

HVACNUT

Is the control a Hydrostat 3250 Plus? If the probe is in correctly, I would trust it over the tridicator gauge. 
What's the economy setting? If High, lower it to 5. If it's on 5, lower it to 4, etc.

EBEBRATT-Ed

It can be several problems or nothing.

Aquastat sensor may not be pushed in the well all the way or it may need heat conductive compound

If the circulators are not running the boiler water may stratify (cooler water at the bottom and hotter water at the top) may cause gauge to differ from aquastat.

Not uncommon for gauge to read 10 degrees or so different from aquastat

But if the house is not heating the contractor needs to come back and figure out why?

Could be airbound

Paul986

HVACNUT said:

Is the control a Hydrostat 3250 Plus? If the probe is in correctly, I would trust it over the tridicator gauge. 
What's the economy setting? If High, lower it to 5. If it's on 5, lower it to 4, etc.

Yes Hydrostst 3250 Plus, going to check out the Economy modes, Soon as I figure out how to change them. Thank you

Paul986

EBEBRATT-Ed said:

It can be several problems or nothing.

Aquastat sensor may not be pushed in the well all the way or it may need heat conductive compound

If the circulators are not running the boiler water may stratify (cooler water at the bottom and hotter water at the top) may cause gauge to differ from aquastat.

Not uncommon for gauge to read 10 degrees or so different from aquastat

But if the house is not heating the contractor needs to come back and figure out why?

Could be airbound

Thank you, The house is heating, all zones are working, just not getting past 68 degrees when real cold out, I'm going to get him back.

EdTheHeaterMan

I used to call the difference between two different thermometers “allowing for Kentucky Windage”

if you purchase a thermometer for scientific testing in a laboratory, don’t expect to pay less than $500.00 for the economy model.  When a boiler manufacturer buys a thermometer for a boiler to meet minimum code specifications, they pay less than $7.00 purchased in bulk.  

If you tell me you believe that both thermometers are just as accurate, I have a bridge for sale in Brooklyn that may interest you 

And what @hv@HVACNUT and @eb@EBEBRATT-Ed said above

Mr Ed

HVACNUT

Paul986 said:

Is the control a Hydrostat 3250 Plus? If the probe is in correctly, I would trust it over the tridicator gauge. 
What's the economy setting? If High, lower it to 5. If it's on 5, lower it to 4, etc.

Yes Hydrostst 3250 Plus, going to check out the Economy modes, Soon as I figure out how to change them. Thank you

Toggle through the red button on top of the Hydrostat. It'll list hi limit, low limit, economy, etc.
There is a dial inside to adjust the setting.