LG MULTI V WATER MINI Engineering Manual page 49

• The flow switch is a required installation component on the horizontal pipe of the water
source unit's heat water-supply outlet. Verify the direction of the water flow before
installation. The flow switch must be the normally open (closed on increase of flow) type.
(Picture 1)
• Remove the jumper wire and connect to the communication terminals (4[A] and 4[B]) of
the water source unit's control box. (Pictures 2, 3) Open the flow switch cover and check
the wiring diagrams before connecting the wires. Wiring methods can vary by flow switch
manufacturer.
• When setting the flow switch, it is recommended to use the default set value of the water
source unit to satisfy the minimum flow rate. (Minimum flow rate range is 50%; Refer-
ence flow rate: 4.4-ton - 15.9 gpm.) When the Variable Water Flow Control kit is also
installed, set the flow switch minimum flow rate to 40% of the nominal flow rate instead
of 50%.
• If the product operates while the flow switch contact point is out of the permitted range,
it can result in performance deterioration or system failure.
• The flow switch must be the normally open (closed on increase of flow) type.
Solenoid Valves (Optional)
Solenoid valves may be installed to shut off water flow to the water source unit when the
unit turns off. Solenoid valves are field supplied, must be rated for 208-230V, and must be
wired to terminals L1 and L2 on the water source unit PCB.
Field-supplied solenoid valve must be the normally open (closed on increase of flow) type.
WATER CIRCUIT INSTALLATION
Due to our policy of continuous product innovation, some specifications may change without notification.
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Flow Switches and Solenoid Valves
Picture 1
Picture 1
Picture 2
Picture 2
3(B) 4(A)
Picture 3 Picture 3
Picture 4
4(B)
WATER CIRCUIT | 49