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Installation of Outside Unit
8. Water Piping System
8.3 Flow switch work
Picture 1
■ The flow switch must be installed at the horizontal pipe of the heat water supply outlet of the product and check the
direction of the heat water flow before the installation. (Picture 1)
(Flow switch acts as the 1st protection device when the heat water is not supplied.
If a certain level of water does not flow after installing the flow switch, an error sign of CH24 error will be displayed on the
product and the product will stop operating.)
■ When connecting the flow switch to the product, remove the jump wire to connect to the communication terminal (5(A) and
5(B)) of the outside unit control box. (Picture 2, 3) (Open the cover of the flow switch and check the wiring diagram before
connecting the wires. The wiring method can differ by the manufacturer of the flow switch.)
■ It is recommended to use the product with default set value to satisfy the minimum flow rate of product.
■ If necessary, adjust the flow rate detection screw after consulting with an expert and adjust to the minimum flow rate range.
(Picture 4)
- Minimum flow rate range is 50% of product rated water flow. Refer to the specification of each model.
- Adjust the flow switch to touch the contact point when the flow rate reaches 50% of the flow rate.
<CAUTIONS>
■ Select the flow switch with the permitted pressure specification considering the pressure specification of the heat water
supply system. (Control signal from outside unit is AC 220V.)
If the set value does not satisfy the minimum flow rate or if the set value is changed by the user arbitrarily, it can result in
product performance deterioration or serious product problem.
■ If the product is operated with the heat water supply not flowing smoothly, it can damage the heat exchanger or cause
serious product problems.
■ In case of CH24 or CH180 error, there is a possibility that the plate type heat exchanger is partially frozen inside. In this
case resolve the issue of partial freezing and then operate the product again. (Cause of partial freezing : Insufficient heat
water flux, water not supplied, insufficient coolant, alien particle penetrated inside plate type heat exchanger)
■ When the product operates while the flow switch touches the contact point at the flow rate range out of the permitted range,
it can cause product performance deterioration or serious product problem.
■ Must use the normal closed type flow switch.
■ Circuit of outside unit is normal closed type.
Picture 2
Picture 3
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Installation
Picture 4
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