Low water pressure in boiler

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  #1  
Old 11-26-16, 12:18 PM
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Low water pressure in boiler

My expansion tank was leaking and I changed it. I could not find the valve in the return line so I drained the whole system. I changed the expansion tank and now I have low pressure in the system. I also made a mistake of turning on the system assuming that pump will fill the water in the system. I opened by the radiator valve on the second floor. The furnace is in the basement

Looks like I made many mistakes so need help. Currently I switched off the thermostat. Please see attached pictures and advice how I can raise water pressure in the furnace.

Please help. Thank you.

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Old 11-26-16, 12:40 PM
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Welcome to the forums.

The boiler shouldn't fire until pressure is back up. You may need to turn off AC power.

In the picture.... the valve on the left is the pressure fill valve and the valve on the right is the shutoff valve. Make sure the green valve is turned on or you won't get any water.

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Old 11-26-16, 01:11 PM
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Thank you, Pete.

I did that and the pressure is still not coming up. Just on a side note, the green valve is to be kept open at all times - correct?

Appreciate the help.
 
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Old 11-26-16, 02:56 PM
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Tek,
Yes you can leave that valve open. There is a lever on top of your feed valve. Manually lift that lever and see if you can hear water entering the system and if the pressure rises. You may have a defective gauge. Those feed valves are factory set at 12 to 15 PSI.
On a side note when you do get pressure restored you still will have no heat until your system is bled. This may seem like a useless statement but depending on the experience one has with a hot water system it bears repeating.
 
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Old 11-26-16, 04:26 PM
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I don't see a manual fill on that pressure regulator valve.
 
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Old 11-26-16, 06:07 PM
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I don't see a manual fill on that pressure regulator valve.
I don't either, but is it rotated out of sight behind the PRV's stem? If not, grab the stem with vise-grips, and lift it to increase pressure. Otherwise, replace the pressure reducing valve.
 
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Old 11-26-16, 06:22 PM
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I don't see a manual fill on that pressure regulator valve.
Its there..... .
 
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Old 11-26-16, 07:29 PM
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PJ,
Not visible, facing the wall but that valve has a lever that you can lift up to fast fill the boiler. It screws on the top and there's a stem under it that pushes down on the diaphragm to feed the water to bypass the factory setting.
 
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