Posted by jtown on February 01, 2000 at 08:20:59:
In Reply to: replacing taco 007 circulator cartridge posted by rick ratta on February 01, 2000 at 05:57:53:
If you have shut-offs for the supply and returns of each zone you can isolate the water that you need to drain. Shut off make-up line and then open the blowdown to remove pressure and drain it down. You may need to open some air vents up above to help water drain. If you are not soldering in valves etc, a trickle shouldn't matter. When refilling, open all the valves you closed and close the air vents. Open the makeup valve. Look for a by-pass around the make-up to fill it faster. Your make-up may have a lever etc to "rapid fill" it. Just open that until pressure climbs. You don't want to put the higher city pressure on the heating system. Then bleed air out of circuits until it is all out. It can take a while, especially if you don't have a by-pass or rapid fill. Have the boiler shut off of course.
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