Circulating Air Source Heat Pump Water Heater
9
3.6 Install the water flow switch
The water flow switch is used for measuring water flow of the circulating water side. When the
circulating flow reaches its closed flow, it is used to output closed loop circuit; and when water flow is
smaller than a certain flow, water flow switch will send out a break-off signal to stop the units and thus
protect compressor, water pump and other important components.
（
1
）
Usually water flow switch contains detachable paddles that are 45mm, 65mm, 75mm or
85mm’s long and 16mm’s wide. The paddle can be trimmed conditionally during installation.Please
make sure the rear part forms an arc that matches the pipe and the bottom of the paddle should be
10%-20% above the pipe central line, thus avoiding collision between the paddle and the inner surface
of pipes as well as other objects inside.
water flow switch
other valve
fluid direction
Installation diagram for the water flow switch
（
2
）
Please make sure that the flow direction is consistent with marks on the water flow switch box
cover;
（
3
）
Water flow switch should be installed on horizontal pipes, and make sure that size of A in above
diagram is at least 5 times larger than pipe caliber;
