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Water may enter into the flow switch and cannot be drained out, it may freeze when the temperature is low enough. The
flow switch should be removed and dried, then can be reinstalled in the unit.
NOTE
CAUTION
Be careful not to deform the unit’s piping by using excessive force when connecting the piping. Deforming the piping may
lead to malfunction of heat pump.
If air, moisture or dust gets in the water circuit, problems may occur. Therefore, always take into account the following when connecting
the water circuit:
Use clean pipes only.
Hold the pipe end downwards when removing burrs.
Cover the pipe end when inserting it through a wall to prevent dust and dirt entering.
Use a good thread sealant for sealing the connections. The sealing must be able to withstand the pressures and temperatures
of the system.
When using non-copper metallic piping, be sure to insulate two kind of materials from each other to prevent galvanic corrosion.
As copper is a soft material, use appropriate tools for connecting the water circuit. Inappropriate tools will cause damage to the pipes.
NOTE
The unit is only to be used in a closed water system. Application in an open water circuit can lead to excessive corrosion of the
water piping:
Never use Zn-coated parts in the water circuit. Excessive corrosion of these parts may occur as copper piping is used in the
unit's internal water circuit.
When using a 3-way valve in the water circuit. Preferably choose a ball type 3-way valve to guarantee full separation between
the domestic hot water and floor heating water circuit.
When using a 3-way valve or a 2-way valve in the water circuit. The recommended maximum changeover time of the valve
should be less than 60 seconds.
1.Counterclockwise rotation, remove the flow switch.
2.Dry the flow switch completely.
1
2
There need drying
Fig. -7
16
19


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