I changed my igniter module and now my boiler heats up the house but it won't shut off automatically. I have to manually shut down the entire system. Someone please help.
Ion exchange resins are polymer beads treated to have charges sites that allow ions to attach to them. For example, cation resins have negative sites that cations can attach to. For demineralization purposes, they are charged with acid (H+) ions. Most other cations have a greater affinity for the resin sites than H+, so they displace the H+ and attach to the resins, putting the H+ into the water. The same thing happens with anion resins, except OH- is used instead of H+ to exchange with anions. Cation reaction: R-H+ + Na+Cl- R-Na+ + H+Cl- Anion reaction: R+OH- + Na+Cl- R+Cl- + Na+OH- Actually if you follow the cation reaction with the anion reaction something interesting happens, the anion reaction changes to: R+OH- + H+Cl- R+Cl- + H+OH- The H+OH- is H2O! So the chemicals you use to charge the resins with neutralize one another. To recharge the resins you add an acid (I'll pick HCl) and a base (NaOH). This works because you have a relatively high concentration of a acid and base (2% to 8%) which cases the reaction to go in reverse: R-Na+ + H+Cl- R-H+ + Na+Cl- R+Cl- + Na+OH- R+OH- + Na+Cl-
Everybody seems to be recomending the bearded dragon. Let's get away from that and get you something more interesting. Check out chinese water dragons, as they are inexpensive, and quite cool looking, or if you want something really out of the ordinary, look up a couple species of uromastyx.
