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Posted by HeatPro on May 20, 2006 at 23:54:10:
In Reply to: copper tube boiler groaning/vibrating posted by Dave on May 20, 2006 at 21:09:23:
The pressure is low because the rest of the system is not at heating temperature, so it has 'shrunk' in volume, birnging the pressure down.
The groaning is the same problem wou've been working on for two years now. The large-input boiler is putting heat into the system at the rate of 140,000 btuh, while the domestic water heater is absorbing 60 gallons worth of heat at about 40,000 btuh. That is way too much heat for the boiler's water volume to handle with that large input. If you set the domestic water's controller to only turn on the circulater to heat the water with the ErgoMax tank volume and the boiler only heats the Ergomax on demand, the problem will go away. In actuality, the ErgoMax is all the water heater you need; but you don't have it hooked up for domestic water as yet.