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Posted by Harold hydronicnetwork.net on January 11, 2004 at 09:04:12:
In Reply to: Steam boiler stuttering when shutting down posted by george on January 11, 2004 at 03:52:44:
In the cold weather (lately) the probability that the water is up to the high limit temperature is high, so the burner would go on and off as the high limit opens and closes a few times until the thermostat is satisfied. This indicates that the boiler water input is probably a bit higher than the baseboard output. You could possibly reduce the nozzle input, or add more baseboard to the system to compensate; but it is not threatening until it overworks the high limit.
The high limit is a safety device and should not be used until an emergency. It should not be going on and off on each cycle. However, install a second manual-reset high limit set a little higher and you will be secure if the only high limit you have, the Honeywell 7" by 2" switch, fails.