Hybrid Car – More Fun with Less Gas

expansion tank question

register ::  Login Password  :: Lost Password?
Posted by on January 1, 2007, 6:01 pm
 
My domestic solar hot water system is a Revere from 1981. Everything is
original except for the differential controls changed back in 1990. When it
was serviced I was outside minding my own business and the service guy had
taken off the expansion tank. Whether or not it needed to be recharged I
don't know. My question is this. Is it necessary to drain the coolant line
to remove the tank?
The tank has a label on it which simply says system pressure 30 lbs and
minimum pressure 15 lbs.
I drained the line yesterday and repressurized the line to 30 lbs being
careful to get as much air out of the line as possible. I don't mind doing
it again if I have to to get at the expansion tank and remove it. Pressure
gauge is reading 30 lbs and the digital temperature probe attached to the
incoming side from the panels shows a really decent temperature for this
time of year.

TIA,
mark_



Posted by DJ on January 2, 2007, 2:51 pm
 

mark_digital wrote:

A closed system, then. Glycol as the fluid?


Straight answer, yes. Flippant answer, if you take it off and DON'T get
glycol all over you, you're low on glycol ;-). BUT, finish reading this
post, because you probably don't have to remove the tank.


Now, the pressure they're talking about is on the inside of the
expansion tank, not the glycol lines. There should be a pressurization
stem there, like the air stem on a car. You pressurize the tank there
with, for instance, a bicycle-pump style compressor and a tire gauge.
But the glycol side of the line has to be zero pressure at the time.


Nope, you shouldn't need to remove it unless there's no pressurization
stem on the expansion tank. And if there ain't, I'd recommend a new
tank that does have one.
 
DJ


Posted by on January 2, 2007, 7:10 pm
 

mark_digital© wrote:

A closed system, then. Glycol as the fluid?


Straight answer, yes. Flippant answer, if you take it off and DON'T get
glycol all over you, you're low on glycol ;-). BUT, finish reading this
post, because you probably don't have to remove the tank.


Now, the pressure they're talking about is on the inside of the
expansion tank, not the glycol lines. There should be a pressurization
stem there, like the air stem on a car. You pressurize the tank there
with, for instance, a bicycle-pump style compressor and a tire gauge.
But the glycol side of the line has to be zero pressure at the time.


Nope, you shouldn't need to remove it unless there's no pressurization
stem on the expansion tank. And if there ain't, I'd recommend a new
tank that does have one.

DJ
_________________________________________

Thanks DJ.  Yes it's a glycol system and the tank does have a valve like you
mentioned. I have an electric air pump (a cheapy from many years ago). I'll
give it a try.

mark_



This Thread
Bookmark this thread:
 
 
 
 
 
 
  •  
  • Subject
  • Author
  • Date
please rate this thread