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very high pressure reading on No. 1 ideal red flash boiler

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Posted by Peter on September 04, 2008 at 15:20:50:

We have a very old American Rad. Co. No.1 Ideal Red Flash Boiler. It works and we are not ready to get rid of it. I'm concerned about the pressure reading from the round gauge on top of the unit and have had it turned off since late february -- we need it operational for the coming winter. The pressure guage has two sets of numbers and two metal indicator arms. On the right numbers match hash-marks starting at 40 on up to 260 and there is a long pointed black metal arm swung all the way up to the top, beyond the highest pressure reading. On the left there is a crescent shaped pattern of hash-marks beginning at 0 ranging up to 70 at the top. There is a much smaller red metal indicator for this range that is at 30. My question: Is the pressure dangerously high (with the black arm on the right swung all the way up, exceeding the highest numbers)? What numbers should I be reading (the black or red)? Is it possible the pressure gauges are wrong? How is pressure released from an old system like this (our radiators have been bleed twice w/no change in the gauges)? Thanx for any advise we can get.

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