Grundig GHPH-MM08 Manuel D'utilisation page 86

9 Overview of the unit
8) For smart grid:
The unit has smart grid function, there are two
ports on PCB to connect SG signal and EVU signal
as following:
SMART GRID
86 / 276 EN
1. when EVU signal is on, the unit operate as
below:
DHW mode turn on, the setting temperature
will be changed to 70°C automatically, and
the WTH operate as below: TW < 69°C, the
WTH is on, TW ≥ 70°C, the WTH is off. The
unit operate in cooling/heating mode as the
normal logic.
2. When EVU signal is off, and SG signal is on,
the unit operate normally.
3. When EVU signal is off, SG signal is off, the
DHW mode is off, and the WTH is invalid,
disinfect function is invalid. The max running
time for cooling/heating is "SG RUNNIN
TIME", then unit will be off.
Heat Pump Monobloc Inverter / User Manual