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Posted by HeatPro on February 11, 2005 at 18:53:52:
In Reply to: White-Rodgers Controls? posted by markl on February 01, 2005 at 08:13:28:
1. Why are there 2 controls?
It is a good idea to have a backup safety control if the first one fails. It is so rare that there is a failure that residential systems are allowed to have just one pressure control; but commercial units have to have two, the second one requiring a manual resetting to allow the burner again.
2. What should the setting be? (I've changed them to 2/.5 and 1/.5)
+ If the controls will work well at the new setting, that is even better. Some machanics will leave the settings as in your first numbers just to be able to have them work without fussing with the burner input for a long time to get them to work dependably.
So far I haven't been able to find a steam boiler mechanic to work on this system that seems to have a thorough knowledge of my unit. At the previous settings, I've noticed that when the unit is steaming, it will shut down for...say 15 seconds and then go right back on. This does not seem right to me as a lay person.
+ If the pressure settings are at the original higher settings, it will take longer for the burner to get the steam pressure up, so the installer might have made them that high to ease the cycling problem. When the pressure rises up to shut the burner off quickly, it will probably have the burner go on quickly again. This is a result of having a much larger burner than required to fill the steam system. This will happen more often in a smaller house, as the burner/boiler is more likely to be significantly larger than required to heat the house and piping. A burner that will heat the system gently for a long period is more closely matched to the system requirements.
There are all new adjustable vents on the radiators, new vents on the vertical pipes and no discernable leaks. Water level is at 1/2 up the glass and has been purge regularly. Blown down is also done regularly.
+ That is good practice.
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