Quote:
Originally Posted by lwmcguir
Mike, sorry about your wife passing
Zone 2 is really the recirculation loop to act as a stir pump since the 400 doesn't have a dedicated unit. You should feel heat in the exchanger but no fan when the unit is recirculating after you turn it on and it warms up. 450D units have a dedicated stir pump.
And you should have two thermostats and two exchangers in the basement, any way the 43 foot and up do
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I have a regular thermostat AND a turn dial next to it in basement. But it doesn't seem like the one for the tanks turns on, not sure which one controls that. Or if the one by tanks is even working, there is a sensor with an orage cap on it near tanks, but I don't hear that heat exchanger run. Need to do some testing
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