Sunrain YC-007TB1, Installation & Operation Manual, Page: 12 / 32

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6. Installation of optional accessories
6.1 Selection of the water pump
●The circulation pump is needed for the system, the power port is prepared for the pump, (one phase)
NOTE
For the single phase pump, please check the circuitry diagram.
●The head of circulation pump = height difference between water level and main unit + total pipelines
resistance (determined by the hydraulic calculation) + pressure loss of main unit (see the nameplate on
heat pump ).
NOTE
Multiple units installed in parallel, the water pump head is subject to the worst working condition loop.
6.2 Selection of the flow switch
●The selection of the flow switch is based on the actual system, the target flow switch is recommended.
Temperature of fluid: 0-120 °C , max working pressure 13.5 bar.
●The flow switch can be installed on the horizontal pipeline or the vertical pipeline which the fluid flow
direction is upward, but should not be installed on the vertical pipeline which the fluid flow direction is
downward.
● The flow switch must be installed on a straight pipeline, there must be more than five times the length of
the pipe diameter at its two sides. And, the direction of fluid must follow the arrow on the controller. The
terminal block should be in an easy operation position, (Figure 8)
●The pannier is absolutely forbid to touch the flow switch floor, or the switch will be deformed and invalid,
(Figure 9)
●Please be sure that the model of target sheet is determined by the system rated flow, diameter of outlet
pipe and the adjustable range of the target(see the user manual). And the target sheet can not contact the
in wall of pipe or other throttlers in pipe, or will cause the switch can not reset.
A
5A 5A
Figure 8 Figure 9