Re: furnace expansion tank replacement
Posted by hj on September 22, 1999 at 14:43:05:
In response to Re: furnace expansion tank replacement
Heating water will always cause a fluctuation. The relief valve should be set for 30#, which is more than the max 22# you are getting. Replace the relief valve and also be sure that you are completely draining the expansion tank. If it is not leaking, unless it is a bladder type, then there is no reason to change it. If it is a bladder type, but the air pressure does not leak out, or water does not come out of the air inlet, then it is also probably Okay.
: Terry,

: I have noticed the pressure in my furnace is causing the
: relief valve to work. The fluctuation of temp/pressure is:
: @160 8lbs - @190 22 lbs. I have drained the expansion
: tank and recharged it..and I still have these fluctations.
: Is it time for a new expansion tank?

: Thanks,
: Bob

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