LG Multi V Water IV Installation Manual page 76

WATER CIRCUIT INSTALLATION
Water Circuit Design
Figure 60: Open-Type and Closed-Type Tower Design Schematic.
Open-Type
Cooling Tower
First Side
Heat Exchanger
Open-Type Cooling Tower with Heat Exchanger
A heat exchanger is installed between the cooling tower and water
source unit system piping, and the temperature difference between
the first and second sides is maintained constantly.
Note:
When using an open cooling tower or open geothermal wells, using an intermediate heat exchanger is recommended to protect the water
source unit from contamination.
Expansion Tank
All closed loop systems should have a bladder type expansion tank installed. The expansion tank protects the equipment from excess
pressures due to expansion and contraction of water in the loop as the temperature changes.
Heat Source
There are several sources for heat that can be used for this system including:
• Electric boiler
• Gas boiler
• Solar heat with storage tanks
• Ground source heat
• Steam heat from remote central plant
Geothermal Water Circuit Design
Instead of a cooling tower / boiler, Multi V IV Water Source Units may use a geothermal system that is properly sized to match the WSU's ca-
pacity. This year round heating and cooling system uses a two (2) pipe closed loop water circuit that circulates water continuously, maintain-
ing water temperatures between 23°F and 113°F for heating, 23°F and 113°F for cooling. When the WSU is in cooling mode, heat is rejected
to the geothermal system. When the WSU is in heating mode, heat is absorbed from the geothermal system.
Multi V IV WSUs have factory-installed stainless steel plate heat exchangers. To protect these heat exchangers, it is recommended to use closed
geothermal water loops. Should open geothermal systems be used, an intermediate heat exchanger should be installed to isolate the water
source unit from contaminants in the water system. Open geothermal loops may contain minerals, biological contaminants, corrosive agents,
or other scale, fouling or corrosion-causing substances that could degrade performance or shorten the life of the heat exchanger and WSU.
Antifreeze can be used for all geothermal applications. Refer to "Freeze Protection" on page 78 for recommended levels of antifreeze and
correction factors.
76
Second Side
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.
Closed-Type
Cooling Tower
Closed-Type Cooling Tower
Heat-source water of the cooling tower is supplied directly to the
water source unit system.