Filling Oil Furnace

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Old 05-03-13, 06:43 AM
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Filling Oil Furnace

Hello, I'm new to this forum but I'm a serious DIY'er.

I'm installing a 50 plate flat plate heat exchanger between my outdoor wood fired boiler (Non-pressurized) and my indoor oil furnace (pressurized). To install the flat plate heat exchanger, I need to drain the oil furnace of the water after it cools off. After making the necessary connections to oil furnace, I will need to fill it again with water. How much pressure must there be on the temperature and pressure gauge for it to operate safely? Thanks in advance for your help. Roger
 
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Old 05-05-13, 06:30 PM
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A good starting point is 12 psig cold. If your house is taller than average you may need to increase the pressure a bit.
 
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Old 05-06-13, 11:14 AM
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Grady - Thanks for the reply. After I drained the oil furnace of water, the T&P guage showed 40 psi. I know this is wrong because there was no water in it. I replaced it with a new one and it now reads 12 psi. Again, thanks for your help. Roger
 
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Old 05-06-13, 11:32 AM
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As Grady mentioned, 12PSI is a safe level cold.
I tend to run ~20PSI hot. By boiler is in the basement, and the water has to travel 3 stories.
 
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