Per Tim Small:
in heating mode, the damper would open, but boiler will
not switch on.
Probable cause: in the zone controller, the thermostat
signal value gets adjusted for the mode (1 for heating,
-1 for cooling) twice - first time before being
submitted for consideration, second time - when
actually calculating demand. Therefore, demand is
proportional to the summary error, regardless of the
mode. Since the HVAC is switched on when demand is
positive, this won't happen because the sign of the
signal is wrong.
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