Posted by Paul on December 28, 2001 at 14:51:57:
In Reply to: Crane Sunnyday 5 boiler problems HELP posted by JC on December 25, 2001 at 15:44:38:
Several thoughts. I've little experience with home heating boilers, mostly industrial and ship's. However here's my two cents.
If you are getting 17 psi on the boiler gauge the tea kettle sound is probably the safety blowing off. Check the tally plates on the boiler and the valve to see what your M.A.W.P. is. If it's 15 psi or lower, then it's likely your high pressure cut out not working or set wrong. If it is the safety opening up then that's where your water is going. As for air in your system, most likely you're putting it in with the city water. This is especially true if your make-up is cold. Use pre-heated water for make-up,saves on fuel and thermal shock as well. You can pre-heat with a small economiser, which can be as simple as a coil wrapped around your stack or a heat exchanger in your return. If you're having to vent your radiator traps a lot try installing some automatic bellows or disk type traps. You could also install a return trap by the boiler. Or if you're really ambitious and have the room an air seperating tank. All these things would have to comply with your local Codes as well because your local inspectors WILL insist on it.
Hope it helps.
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