I live in Yukon and have radiant floor heating in a lightweight concrete slab. My Tekmar 361 controller is about 18 years old and has performed flawlessly. I recently changed from a Weil McLain Gold oil-fired boiler to an IBC , model SL10-85 G3, propane boiler. My heating system is basically like this:
The boiler is doing a fine job of keeping the high temp loop hot. But the injection pump is not pumping into the low temperature loop, even though I raise the desired room temperature on the Tekmar.
I thought the injection pump was toast and had a plumber come in to replace it today, but still no joy. The only time I can get the pump to work is by turning the breaker off and then on - the variable speed indicator slowly climbs: 10%, 30%, 50%, 70% (feeling some heat in the pipe for a few seconds), 90% (pipe is very hot for a few seconds), then the burner icon comes on, the percentages quickly drop to nothing, and the pump shuts down and the pipe cools off again. This all happens in about a minute.
With the old boiler, the burner icon (boiler relay indicator) on the Tekmar would come on when the high temperature loop temperature fell below a set threshold and would turn on the boiler. Since the changeover to the IBC boiler, the burner icon on the Tekmar control is ALWAYS on. The old WM boiler didn't have a brain - it just did what the Tekmar controller told it to do. But the IBC boiler has it's own controls built in. I suspect that it has some kind of conflict with the Tekmar controller.
Any ideas? I have feelers out, but it's hard to find anyone up here with Tekmar knowledge.