Heating and cooling
In 4-pipe applications, the thermostat controls 2 valves in heating and cooling mode, heating/cooling mode by manual selection. Heating and cooling mode (P02 = 4) is factory-set.
4-pipe application with manual changeover
The heating or cooling output can be released via operating mode button if P02 is set to Manual (P02 = 3).
On/Off control
The diagrams below show the control sequence for On/Off control.
Heating and cooling mode (P02 = 4) | |
Heating mode with manual selection (P02 = 3) | Cooling mode with manual selection (P02 = 3) |
T[°C] Room temperature | YH Control command "Valve" |
w Room temperature setpoint | YC Control command "Valve" |
Xdz Dead zone (P42) | SDH Switching differential "Heating" |
SDC Switching differential "Cooling" |