Calibrating RK2001 Exit Water Temp

[Tennman]

Based on multiple water temp sensors, the RK2001 controller thinks the exit water temp is 10*-15*F high which limits storage capacity. I could move the TC or experiment with an insulator but does anyone know if the RK has a potentiometer or something for TC calibration? Max exit water temp for the RK is 195*F so my boiler deltaT and max energy storage is restricted. Lots of boilers with these controllers so I'm betting someone's solved this. Thx in advance.

 

[91LMS]

the biomass60 only uses one temp sensor input for controller on output temperature. it is actually not even in or on the water jacket. mine indicates 10-12 deg hotter than a manual temp gauge located in the boiler supply pipe.

 

[Tennman]

I wonder if it is a thermistor or thermocouple. Doubt the manual says.

 

[ewdudley]

My Attack came with an RK-2001UA and they list thermistor values for the probe:

http://www.ecoheatonline.com/eco attackmanual 10 09.pdf

Search for "Scheme of dependency of resistance on the temperature of heating water by the thermal probe"

Should be able to remove probe from controller and test in a water bath with a ohm meter and a known-good thermometer to verify that table makes sense, or to make your own table, for that matter.

Then add resistance in parallel to lower the temperature that the controller sees and then figure out what setting you need to have the temperature you want.

 

[Tennman]

Great EW. Thx. Planning on a potentiometer. Will post how it goes.