Water Circuit Installation - LG MULTI V WATER MINI Engineering Manual

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WATER CIRCUIT INSTALLATION

Water Circuit Design

Design Steps

The Multi V Water Mini unit requires a water cooling / heating source. This year-round heating and cooling system uses a two (2) pipe closed

loop water circuit that circulates water continuously and maintains water temperature between 23°F and 113°F for cooling mode, 23°F

and 113°F for heating mode. Variable water flow control kit (PRVC1) is required for all entering water temperatures; one kit per frame. See

capacity tables for performance at different entering water temperatures. At the high end of this temperature range, heat is rejected through a

cooling tower (dry cooler or geothermal well), while at the low end of the temperature range an auxiliary heat source like a boiler, solar panel,

or geothermal well adds heat. If entering water temperature falls below 42°F, glycol must be added to the system.

Piping, pumps, and accessories must be sized to provide adequate water flow to the water cooled unit based on nominal flow rates listed per

model number.

Design Schematic

The Multi V Water Mini units have factory installed stainless steel plate heat exchangers. To protect these heat exchangers, it is

recommended to use closed cooling towers. If open cooling towers or other open loop systems are used, an intermediate heat exchanger

must be added to protect the water cooled unit from contaminants and debris in the water system that may clog the heat exchanger. Open

loop systems without an intermediate heat exchanger are not recommended due to risk of freezing, reduction of flow due to scaling or

clogging, or other potential problems caused by improper water quality.

Figure 15: Cooling Cycle Diagram with Cooling Tower.

Figure 16: Heating Cycle Diagram with Boiler.

Due to our policy of continuous product innovation, some specifications may change without notification.

42 | WATER CIRCUIT

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