In a 4-pipe system we have 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 cooling pre-control macro “PRCC_PreCtrlClg“.
For a correct 4-pipe system operation:
With these settings the heating pre-control will operate as shown in the next table:
Table 1. Pre-control heating operation
HVAC_Mode |
SYS-01 |
Pre-control Heating |
0,1 |
1 |
off |
2 |
1 |
heat |
3 |
1 |
off |
4 |
1 |
heat |