Honeywell SDC Service Manual page 177

SDC / DHC Hydraulic Components
Switch-on: Flow setpoint < (current room setpoint + heating limit
setting + 2 K)
Example:
Room setpoint = 22°C, heating limit setting = 2 K
Switch-off at flow setpoint 24°C (22°C + 2 K)
Switch-on at flow setpoint 26°C (22°C + 2 K + 2 K)
Boundary conditions The SUMMER SWITCH-OFF function ("System Parameters"
menu, parameter 04) has priority over the HEATING LIMIT
function.
The FROST PROTECTION function ("System Parameters" menu,
parameter 05) has priority over the HEATING LIMIT function.
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