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Old 02-04-2009, 10:11 AM   #1
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Furnance question


I am first time home buyer and lived in warm weather where a furnance was never required till now so have no knowledge of any kind.

i have a tranco heatmaker in the house with 78% efficeny at last service. the house is 1400 sq ft and this one does a good job.now to the problems.
In the morning i turn on the heat and take a shower and have plentifull hot water. on cold days we have hot water.

now in the evening it is a different story .last night i was trying to give my daughter her bath . luke warm water [happens everyday] i went to check the gauges and it said 140 F[corrected] and 18 Psi of pressure. usually i am used to seeing 180 C. Now i turn the basement zone which i leave at 50 to 60. The furnance comes on than the water temp dropped in the gauge to 80 and furnace kicked on.10 minutes later extremely hot water - my daughter is 1 1/2 and i fear she is going to burn her hands one day because of this .HELP ME WITH THIS PROBLEM

the mix valve is set to max and as i said when its hot its freaking hot and luke warm when cold.the honeywell box and honewell switch look brand new and was told was changed last year. the firing thing is a beckett.

now where can i find a schema for me to understand what each part is and how they work. i found the original manual but that thing assumes you know the basics.
also , my furnance was last serviced 14 months ago so i am going to call some one do it but do they clean the chimney or not?.


Last edited by satz; 02-04-2009 at 12:23 PM.
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Old 02-04-2009, 11:52 AM   #2
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Are you sure thats not 140F.
Since 140C way over waters boiling tamp at atmosheric pressure.

Tanless voil may be getting coated, and need either cooked out or changed.

The mix valve being turned up, generally indicates its been giving trouble for a long time.
And instead of correcting the problem.
The mix valve was turned higher, to correct the symptom.

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Old 02-04-2009, 12:25 PM   #3
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It is F i fixed that.

Mixing valve - I turned it up . it was set way low when i moved in. as i mentioned the temp is constant i can turn it down too as its comeout very very hot when turn to max.

from what i infer their has to be a relay that trips when hot water is requested or temp falls. this is not working correctly.as once the furnance fires we have extremely hot water which means the tankless heater is working fine.some where their is a relay i just do not know where to find it. i am looking for some help as to where it is and how to change it.
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Old 02-04-2009, 02:29 PM   #4
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The low limit temp may be set too low, and the differencial may be set too high.

If its set to 140, you might want to ty 160.
And if the differencial is set to 20 or 25, you might want to try 10.
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Old 02-04-2009, 02:54 PM   #5
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How and where to set this....
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Old 02-04-2009, 03:17 PM   #6
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Rectangular box, labeled Honeywell.
Probably right where your 1/2" hot and cold water lines go into the coil.

Turn power off, remove cover, red dial onbottom righ tis low limit, black dial above it is low limit differencial.
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Old 02-04-2009, 08:14 PM   #7
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Set high and low a minimum of 20f apart and diff all the way up. For more info on this control see link.
http://www.comfort-calc.net/Service/Domestic_Coils.html
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Old 02-05-2009, 05:35 AM   #8
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Setting the diff at max, just makes the domestic water temp vary more. Especilly when the circ first comes on for heat.

A tighter diff setting keeps the water temp more consistant.
It does use more fuel. But, the hot water temp is more consistant.
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Old 02-05-2009, 07:44 AM   #9
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I forgot to add that i brought the house 2 months ago, the previous owner said the furnance is all set for a year as far maintenance goes.

last night the house was full of smoke and fire dept shut the thing down. i called emergency service after a 156$ tag i saw what happened. the entire furnance was full of soot .every thing was clogged .

a new nozzle and vaccuming helped alot.It was clogged so bad. she suggested a full tune up which i am going to do in a week or 2 .anyway ,now we have hot water and had since turned the mixing valve down a bit.


Last edited by satz; 02-05-2009 at 07:50 AM.
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