RK2001U CONTROLLER

[91LMS]

so the boiler is fired and now to fight my way through programming my control. I want my fans and circ pump to shut off after a burn, from what see the would be set in the fb30 parameter?

 

[stee6043]

I don't recall my model # correctly but I assume this is the same controller that's been shipping with EKO's for the last decade or so.

With storage the only way to control your fan/circ after a burn is with third party gear. Myself and many other users on this site use a $10 mechanical 12 hour timer to force our fans to shut down after a burn.

Getting your circ to shut down above your pump-on temp is more challenging. It requires a controller. Many have used a setpoint/differential controller and you can find instructions here for how to do that. I myself just simply let the pump run overnight and on most mornings I'll shut the boiler off before I leave for work to stop the pump.

 

[91LMS]

same controller. what is the purpose of this function?

No-fuel testing time during work mode [Fb30] - in WORK mode, if
temperature of water in the boiler decreases below temperature set with
the thermostat, by hysteresis value, and don't reach temperature set with
the thermostat in programmed time, the control process will be turned off
and the display will show the message: [FUEL]. You can cancel the alarm
by pressing STOP button.

 

[Mike Fromme]

With the rk2000 the boiler needs to reach the setpoint on the controller to trigger the shutdown timer.

Since I have storage my boiler almost never reaches the setpoint and idles... To get the fans to shut off once the fire is going well I turn the dial down to 150 for a second and then back up to 195. That triggers the shutdown timer which I have set to four hours. Works for me since I burn pine and fours is plenty of time for a load to burn down.

 

[Medman]

I hope this is clear:

On the RK2001U, you dial in your desired boiler temp, let's say 180, light the fire and press start. Fans come on, and once the water reaches the set temp (say, 150) the circulator pump comes on.

Once the boiler is firing and the temp reaches 180, the fan shuts down and idles. As the fire burns down, the temp will drop below 180 to the hysteresis value and the fans come back on. If hyst. is set to 10 degrees, the fans will come back on at 170. The fb30 parameter determines how long the fans will run without reaching the set point of 180 before the controller turns them off and displays the FUEL message - say, 1 hour.
The circulator will continue to run until the water temp is lower than the set temp minus the hysteresis value. If hyst. is set to 5 degrees, then the pump will shut off at 145 in this case.

 

[stee6043]

I hope this is clear:

On the RK2001U, you dial in your desired boiler temp, let's say 180, light the fire and press start. Fans come on, and once the water reaches the set temp (say, 150) the circulator pump comes on.

Once the boiler is firing and the temp reaches 180, the fan shuts down and idles. As the fire burns down, the temp will drop below 180 to the hysteresis value and the fans come back on. If hyst. is set to 10 degrees, the fans will come back on at 170. The fb30 parameter determines how long the fans will run without reaching the set point of 180 before the controller turns them off and displays the FUEL message - say, 1 hour.
The circulator will continue to run until the water temp is lower than the set temp minus the hysteresis value. If hyst. is set to 5 degrees, then the pump will shut off at 145 in this case.

The challenge with storage is that the highest "pump off" temp you can set is 168 if I recall correctly. Pump on of 170 with hysteresis of 2. When we get storage temps exceeding 168 (which happens regularly) the pump will never shut off even after all fuel has been burned. In my case my boiler tends to think it's in idle mode when this happens and the fan will run as well. Heretoforewith, my original post above about switches and whatnot.