LG Multi V Water IV - Water Circuit Installation: Field-Supplied Components; Piping System Components and Requirements

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Water Circuit Installation
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WATER CIRCUIT INSTALLATION
Piping System
The following field supplied components must be installed at each Multi V Water IV Water Source Unit. Refer to Figure 61.
• Flow switch at outlet in the horizontal pipe. Wire the flow switch to communication terminals and set to shut off the WSU if flow falls be-
low 50% of WSU design flow. The flow switch must be the normally-closed type. The flow switch must be installed within at least five (5)
pipe diameters downstream and at least three (3) pipe diameters upstream of elbows, valves, or reducers which can cause turbulence
and lead to flow switch flutter.
• Strainer with minimum 50 mesh screen at inlet. Clean the mesh screen twenty-four (24) hours after startup, and then clean regularly to
prevent water flow blockage.
• A water balancing valve, circuit setter, or flow control valve to regulate proper water flow to each WSU.
• Dielectric pipe unions to prevent the possibility of galvanic corrosion.
• Pressure gauges at inlet and outlet.
• Thermometers at inlet and outlet.
• Flexible connectors at inlet and outlet.
• Shutoff valves at the inlet and outlet to permit service of the WSU.
• Condensate drain trap per local code.
• Service port with hose connections at inlet and outlet to flush the WSU heat exchanger when isolated from the water loop system.
Other considerations:
• Inhibitors should be used in the water loop, especially if water temperature operates above 104°F.
• Maintain water quality requirements.
Figure 61: Field-Supplied Components and Connections for Multi V Water IV WSU.
Field-Supplied Components for WSU Installation
Gate Valve
Pressure
Gauge
Temperature
Gauge
PT Service Port
(For Cleaning
Heat Exchanger)
Gate Valve
Strainer
(50 Mesh)
Refrigerant Pipes
Water Inlet
Pipe
Flow Switch
Water Outlet
Pipe
Water Balancing Valve
Dielectric
Pipe Union
Dielectric
Pipe Union
Pressure
Gauge
Temperature
Gauge
Flex
Connector
Flex
Connector
Note: Before startup, remove the factory jumper at the flow switch
terminals and install a field supplied flow switch.