In a 4-pipe system are two independent pre-control circuits, one for heating and one for cooling. In this case, we can provide heating and cooling energy at the same time, when the “HVAC_Mode” input takes the value “auto”.
We need both pre-control macros, this macro and the heating pre-control macro “PRCH_PreCtrlHtg“
For a correct 4-pipe cooling operation, do the following:
With these settings, the heating pre-control will operate as shown in the next table:
Table 1. Pre-control cooling operation
HVAC_Mode |
SYS-01 |
Pre-control Cooling |
0,1 |
1 |
off |
2 |
1 |
off |
3 |
1 |
cool |
4 |
1 |
cool |