Weil Mclain Boiler Banging After Water Circulator Swap
I am need of dire help, let me first introduce myself as a very novice handy man, that can do basic home improvement projects but by no means would I have the experience of the board members.
Now my problem, I recently replaced my Bell & Gossett water circulator with a Taco circulator, the Taco circulator is 1/4 of the size and weight of the Bell & Gossett circulator but the guy at home depot told me that the Taco circulator is an equal replacement part (I doubt this now).
So I swap out the water circulator no problem, then I go to start up my Weil Mclein boiler and proceed to bleed the system by going to each radiator and opening up the valve to get all the air out. About 10 minutes into the job I hear loud banging in the pipes, as if the pipes are going to explode, so I figure that this must be air in the system and continue to bleed. The banging noise subsides a bit, in that it would only happen evey few hours instead of every ten minutes, it is late at night now and cold so I let it be. In the morning I get up to leave for work and I hear the banging again, so I turn off the boiler by bringing my thermostat down to 60. As soon as I do this the pressure release valve in the boiler engages and water starts to pour out.
Now I feel that my heating system is not heating as well as it should be (i.e. it takes longer for the house to heat up), but really I could care less as long as it eventually does heat up. Here is my question, what have I done wrong? Why would the pressure release valve start going off now and not before the swapping of the circulators, also why all of a sudden all this banging noise in my pipes? I am perplexed, I feel that simply unscrewing 4 bolts and 2 electrical wires to swap in a new circulator should not be that hard but now I have created 2 new problems.
Any suggestions would really be appreciated.