I am a fairly handy home-owner and as stated I have a 17 year old Burnham Series 2 Gas boiler with 2 zones run off of circulator pumps (no zone valves). It is a hydronic system with baseboard and radiators.I noticed my tridicator is dead and have ordered a replacement. I was also looking to replace the amtrol #30 Expansion tank (replacement ordered) and possibly a taco hy-vent which is atop a taco air separator (vortex).My contracted provider quoted me 500 to do the gauge and states they have to do that to move forward with anything elseThey quoted me 500 for the expansion tank and I'm not sure for the hyvent replacement cost. The hyvent was leaking a lot of water until they pumped the current expansion tank up to 20PSI.As you might imagine, this is ludicrous and for at least $1000 in savings I can replace the gauge and the expansion tank myself . This all started after I attempted a hasty wet-change of the gauge with a gauge I bought that had a probe that was too long. I replaced the old one and the hyvent leak started. Had I had the right part, I would have gotten their $500 change done in 5 minutes and a couple minutes of mopping.Question is as follows:1.) Gauge - if I shut off the boiler, close the water supply, close the valves by the circulator pumps, and then let the boiler cool down and then let off pressure via the drain or pressure relief can I just unscrew and put in the new gauge?2.) Amtrol tank - there is an isolation valve immediately 1 inch above the connection for the expansion tank with no other piping. If I close this valve and air down the tank can I just spin it off and spin on the new one with Teflon tape? This seems far too easy to pump to 12 psi and screw on for $500. Is there an equation to determine tank pressure based on boiler pressure?3.) Hy-vent on air separator- I have no idea what size to buy until I can remove it and take it to the supply house, but if after letting off the pressure while doing the gauge, can I just unscrew this with channel locks, go to the store and screw the new one on? I assume that would get Teflon tape as well? (There would be male and female threads as I gather) Further, it isn't currently leaking but I figured while I was at it, It couldn't hurt.After doing all this I planned on bleeding the system of air to the best of my ability and if any issues, call another professional to double check my work and start new with a new company I can trust.I can take pics, but currently I am not home. Any advice is greatly appreciated. via /r/DIY http://ift.tt/2Aniph7
