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6.3 Water Flow Control
Water source unit is damaged if it is operated with no water circulating through the water piping.
It is necessary to provide the water flow switch (field-supplied) on water outlet side of water piping
within approximately 1~2m from each water source unit to realize stop protection.
If water flow switch is open while the water source unit is operating, “A2” alarm occurs
.
Water flow switch should be turned ON in 240sec. or less after water source unit starts operation
Refer to Section 8.3 for the details of wiring to electrical box.
NOTICE:
● Select water flow switch (field-supplied) which output close signal when minimum flow rate is satisfied for
each water source unit. Refer to the table at Section 6.2.
● Install water flow switch by following their installation procedure.
● If water flow switch is N
OT
proper (non-detectable), plate heat exchanger may burst due to water freeze or
compressor may damage due to increased pressure. On the other hand, if the water flow switch
detection is easy, then the water source unit is forced to stop frequently.
● Water flow switch is not required to detect overflow rate.
However overflow rate may cause refrigerant cycle trouble
Water
Source
Unit
Water
Source
Unit
F
Water Flow
Switch
CORRECT
F
Water Flow Switch
INCORRECT
Summary of Contents for AVWW-114FKFW
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