1. The water supply temperature of the heat exchange unit is higher than the return water temperature, and the water supply pressure is higher than the return water pressure.
2. The difference between the primary water supply pressure and the return water pressure should be greater than or equal to 0.05MPa.
3. The difference between the inlet and outlet pressure of the secondary side of the heat exchange unit should be less than or equal to 0.15MPa.
4. If the primary side is high temperature water, the temperature difference between the water supply temperature and the return water temperature of the heat exchange unit cannot be higher than 40 degrees.
5. If the primary side is low temperature water, the temperature difference between the water supply temperature and the return water temperature cannot be higher than 25 degrees.
6. If the secondary side is heated by a radiator, the temperature difference between the water supply temperature and the return water temperature of the heat exchange unit cannot be higher than 25 degrees.
7. If the secondary side is underfloor heating or air conditioning heating, the temperature difference between the water supply temperature and the return water temperature of the heat exchange unit cannot be higher than 14 degrees.
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