Originally Posted by travelingjw
Thanks to all of you. I ran it down the vent on the opposite side of the heater stack.
There were a couple of runs of Romex down the side opposite the boiler/burner stack including the run that powers the fridge on 120v so I figured bundling my coax cable with those would certainly be fine. As long as you are clear of the cooling assembly and boiler/burner stack it will be fine.
To give you an idea of the temps at the boiler tube - normal operating temp of the boiler is ~180C (~350F) +/- 10C. When I installed my ARP Fridge Defend I had to pack some extra fiberglass insulation around the temperature sensor that gets clipped to the boiler tube to prevent heat from the burner flue from influencing the sensor when operating on propane. If the boiler tube reaches ~250C (~480F) the Fridge Defend turns the fridge off before any damage is done.
There is also a temperature sensor on the bottom absorption coil that controls the fan mounted to the bottom vent cover. That sensor turns the fan on when the coils hit ~115F and turns it off when the coil temp drops below ~90F. So under normal operation the absorption coils can be a bit hot to the touch as well.
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