Sunrain BYC-007TF1, Installation & Operation Manual, Page: 13 / 28

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6. Installation of optional accessories
6.1 Selection of the water pump
●The circulation pump is required for the system to operate, there is a terminal connection for the pump
(single phase)
NOTE
For single-phase water pumps, please check the wiring diagram.
●Head of circulation pump = height difference between water level and main unit + total pipeline
resistance (determined by the hydraulic calculation) + pressure loss of main unit (see nameplate on heat
pump).
NOTE
Multiple units are installed in parallel place more demand on the water pump requirement.
6.2 Water pipe selection
●The selection of the water pipe should be based on the actual system specifications
●The flow switch can be installed horizontally or vertically. If installed the direction of the water flow must
be upwards and NOT downwards.
● The flow switch must be installed on a straight pipeline, and there must be more than five times the
length of the pipe diameter on either side of the flow switch (see Figure 9 below). The direction of fluid
must follow the arrow on the controller. The terminal block should be installed in a position that is easy to
operate.
A
5A 5A
Figure 9