Chapter Ⅱ Installation（4. Design of Water System）
17
Installation Sketch Mpa of Modularized System
Notes：
① When the unit is installed lower than the water tank, then the height difference between
the water tank and the unit should not be larger than 8m, otherwise there should install an
intermediate transitive water tank; if the unit is installed higher than the water tank, pay attention
to the model selection of circulating water pump, ensure that the single unit circulating flow
volume should not be less than the value stipulated in Sheet 3.
② Water temperature in the booster pump, circulating pump, water supply/back water
pump should not be less than 60℃.
③ Generally the inlet water is tap water, the water inlet should be installed with a filter (with
over 30 filter holes) to prevent the impurities from entering into the unit. If the water quality is bad,
then it should install an electronic hydrotreater to ensure the good water quality.
④ Circulating heat insulation: when the temperature detected by the temperature sensor of
water tank is lower than the set temperature, circulating heat insulation function is started up.
⑤ Back water control: when the water system of user side has not been used for long, the
water temperature in water pipe of the system will decrease to a certain back water setting value,
the back water magnetic valve will be started, and user water supply pump is started to push the
hot water in the hot water storage tank into pipeline network to make the water temperature inside
the pipeline increase. When the water temperature is increased to +6℃ over the set temperature
or to a certain temperature that can support the backwater pump to keep operating, the backwater
magnetic valve will be stopped for ensuring the water temperature requirement. The back water
magnetic valve should be controlled by control leading wire of backwater pump.
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