Finally got new boiler installed

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  #1  
Old 11-13-13, 06:27 AM
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Finally got new boiler installed

They came and installed my new boiler and its been running for about a week. Its a Peerless Purefire PF-50. I have it set to run 120 water temp for now. Its been running for 1 week I noted today that there have been 22 ignitions and the total run time is 52 hrs. Its been in the low 40s and 30s here last night it got down in the teens. This morning it was chugging away at 50% output and 120. House toasty warm at 72. Are the burns too long at around 2 hrs+?
I have used 2500 cubic feet 0f gas according to the meter.
 
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Old 11-13-13, 05:01 PM
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I have used 2500 cubic feet 0f gas according to the meter.
Initial reaction is that is seems high... that's 2557500 BTU ... let's say 7 days = 1 week ...

that's 168 hours... 2557500 / 168 = about 15K BTUH average.

Seems high for VA this time of year.

How many sq ft you said your home is?
 
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Old 11-13-13, 05:31 PM
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seems high... that's 2557500 BTU
That's 25.6 therms. Here in the Midwest, for most of October and the first week of November 2013, I paid about $0.56 per therm, which includes gas cost, delivery charge, fixed customer charge, taxes, fees, etc. So, at my rates, that usage would amount to 25.6 x $0.56 = $14. The less I burn per month, the higher the cost per therm, due to fixed charges - so that latest period's cost per therm is above average. (I used to live in Virginia, too, but like Toto, I moved west to Kansas at one time.)

My 29-day bill for the period ending November 7 was $82.13 for 144.56 therms. In addition to space heating, I also use gas for grilling, cooking, water heating, and clothes drying.

1 therm = 100,000 Btu.
 

Last edited by gilmorrie; 11-13-13 at 05:58 PM.
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Old 11-14-13, 04:22 AM
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1516 sq ft.
so now if it seems high how do I tweak it? I just lowered the output temp to 120 2 days ago to see if I could heat at that temp which it does. Delta T may be low as this am, it was showing 120 supply at 51% input and return of 109.

I wonder if the old thermostat may need replaced or the anticipator adjusted. It is overshooting a few degrees before shutting down the heat.
 

Last edited by Frank_S.; 11-14-13 at 05:22 AM.
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Old 11-14-13, 05:22 AM
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2557500 / 168 = about 15K BTUH average.
1516 sq ft.
Well... that's only 10 BTU/SQ FT, so probably not far from correct...

Initially you said "... running for about a week ..." If more than the 7 days I calculated, better even...

Delta T may be low as this am, it was showing 120 supply at 51% input and return of 109.
The lower you run the supply water, the smaller the Delta T gets. You'll only get a 20 DT at the water temperature which the system was designed for.

Consider that if you were to run room temperature water through the system, your DT would be 0 because there would be no 'motivation' for that water to give up any heat. The hotter the water is, the more 'driving force' there is, and the more heat is given up, and the DT increases.

So, that part seems normal to me.

I need to look at the manual for your boiler and see what settings you have and what you may be able to 'tweak' to fine tune... will do that later... or sooner if you can find a link to the manual so I don't have to look for it!
 
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Old 11-14-13, 05:38 AM
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http://s3.pexsupply.com/manuals/1316..._PROD_FILE.pdf

Try this Trooper. And Thanks in advance.

By the way the boiler is piped direct. No pri/sec. Peerless said it was OK as there is no zoning.

B&G NRF-22 circ pump on return side.
 
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Old 11-15-13, 02:55 PM
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Here are the parameters as set
Boiler settings
1 Pump mode -1 (CH)
2 Location -USA
3 Vent material PVC
4 Freeze protection 40
5 Blower Post purge-30 sec.
6 additional Safety - LWCO not installed

1 CH settings mode -1 thermostat and ODR
2 CH pump purge- 20 Min
3 Gen circ purge-0
4 Pump delay step modulation-OFF
5 system Type- User Defined
6 wwsd-70
7 reset curve design- Boiler 140, outdoor 16
8 Reste curve mild weather- 80 @65
9 Reset curve boiler min-80 max 145
10 Boost function-Temp 18,Time 20
11 Anti cycling-10
12 CH response time was 60 now 40
13 CH rate100%
 
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