Hello. I have had this problem for two days now. I have a Crane Gas Boiler in a Ranch. For weeks we had banging in the pipes and now when the heat is turned off we still are sweltering at about 80 degrees. We have two thermostats. One in cellar and one upstairs. The cellar is working properly so I have taken alot of voltages, or other readings at transformers and so on. The stat upstairs tested defective so I replaced it with a digital pre- programed thermostat. It used to have a round low voltage Honeywell. I drained and refilled the water in the system because there seemed to be no water there. I opened the bleeder valves on top of the returns and flow valve and got all hot air. The thermostat at the boiler reads 180 degrees and this seems to be the last possible problem? How do I test this stat and the tramsformer its attached to and does anyone have any other possibilities to resolving this that I have not thought of? Please help as soon as possible, thanks.

 

Is the burner still burning all the time?? If so, you may of hooked up the new t-stat wrong.. Remove wires hooking up to the t-stat and tell us what wire is hooked up to what.. Make/Model of the t-stat?


When the wires are removed, the burners shouldn't be running anymore.. If it still is burning, check your other t-stat, and see if that is turned up by mistake.. again, remove the wires on that t-stat and inform us.. does the boiler stop burning when you remove the t-stat from the wire??

Is your pump still running at all times too??

 

The wire hook-up is as follows. White wire which was hooked up to W on the old honeywell is now on W of new digital Stat Heating Control). The R or K wire (Black) on the old Honeywell is now hooked up to RH, RC, (Heating transformer). As specified in the wiring diagrams. There are only two wires, white and black. I believe the wireing is correct and that it has something to do with the stat attached to the boiler for the Hot water heater? The boiler is not running all the time but I'm still getting constant heat. The motors to the stats only run when I turn the stats up to call for heat and shut back off when I turn them off. But I still get constant heat. Someone told me that because there was almost no water in the pipes that there would be no control. So I filled the pipes and flushed again. They are filled, stats working properly, transformers working, still constant heat on the up stairs level. There are five connections to this new thermostat, 1-Fan relay, 2-cooling compressor, 3-heating control (W-White wire hook to), 4-Heating Transformer (RH-Black wire hooked to, and RC), 5-Cool Transformer. These last two connections are wired together. A note on the bottom of the instructions read: *If replacing a Honeywell TM-11, tape off wire "R"; connect wire "B" to terminal "RH". Seeings I only have two wires and one being "R" (Black) I applied to "RH", "RC". And The white wire "W" to "W". Hope this is not too confusing and bored your eyeballs shut. I need to know how to measure the Thermostat and transformer on the boiler. What readings I should possible get. Thanks for hanging in there.

 

What do the thermostats operate? do they tunr a circulating pump on/off for each zone or do they open/close a small motorized valave?

 

The thermostats turn on circulating pumps when the transformers are ingaged. But thanks anyways guys I have now had to shut down the boiler due to a pressure relief valve pipe that got so hot and blew off its soldered joint. Apparently the water I put in last night also burned off. When the pipe blew a long spray of what appeared to be white smoke sprayed foe about 1 and 1/2 minutes. Stunk up the place real bad. The co2 detector did not go off so I assume its not co2? I had to call someone for tommorro but in the mean time we have no heat and its supposed to be in the teens tonight. Thanks anyway guys and I will keep you informed as to the problem.

 

boilers are dangerous, and not your typical diy fix.

 

I have a bad feeling about this one. Red hot cast iron is what you were probably smelling and I hope you don't need a boiler but I'd be surprised if you don't. You were obviously making steam and thats not what your boiler was meant to do. Good Luck.