Piping System Specifications - LG MULTI V WATER MINI Engineering Manual

WATER CIRCUIT INSTALLATION

Piping System Specifications

Piping System
As shown on the "Typical connections for water cooled units" diagram below, the following components must be installed at each Multi V
Water Mini unit (field supplied):
• Flow switch or differential pressure switch at the outlet in the horizontal pipe. Wire the flow switch to communication terminals and set to
shut off the water-source unit if flow falls below 50% of water-source unit design flow. The flow switch must be the normally open (closed
on increase of flow) 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 water-source unit.
• 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 water-source unit.
• Condensate drain trap per local code.
• Service port with hose connections at inlet and outlet to flush the water-source unit heat exchanger when isolated from the water loop
system.
• Modulating water valve, pressure independent type.
Other considerations:
• Inhibitors must be used in the water loop, especially if water temperature operates above 104°F.
• Maintain water quality requirements.
Figure 18: Typical Connections for Water Cooled Units (All Components Shown Here are Field-supplied).
Gate Valve
Pressure
Gauge
Temperature
Gauge
PT Service Port
(For Cleaning
Heat Exchanger)
Strainer
(50 Mesh)
Gate Valve
Note: Before startup, remove the factory jumper at the flow switch
terminals and install a field supplied flow switch.
44 | WATER CIRCUIT
Water Inlet Water Outlet
Pipe Pipe
M
Flow Switch
Due to our policy of continuous product innovation, some specifications may change without notification.
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Water Balancing Valve
Modulating Valve
Pressure
Gauge
Temperature
Gauge
Dielectric
Pipe Union
Flex
Connector
Flex
Connector
Dielectric
Pipe Union
Refrigerant
Pipes