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Posted by HeatPro on September 15, 2008 at 00:20:57:
In Reply to: Heatmaker M2 HW 130 posted by Cameron Greener on September 14, 2008 at 23:16:26:
: This boiler seems to operate correctly until it reaches its high control setting and the burner shuts down.
+++ When a boiler shuts down only on the high limit control, it is malfunctioning from incorrect wiring and design. There should be enough radiator to get rid of all the heat the boiler can make before it gets near a high limit.
The burner doesn't come back on unless the low limit tells it to, or the operating control tells it to via the house thermostat.
+++ That is a proper function.
the low limit not shutting the burner down even near the high limit.
+++ It is not the job of a low limit control to shut the burner down; it turns the burner on to satisfy a minimum water temperature. and shuts the burner off when the water is warm enough to make hot water. The burner should turn off due to the rooms not needing heat any longer or the hot water demand is ended. If it doesn't allow the burner to shut down, it is miswired.
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