LG MULTI V HYDRO KIT ARNH963K2A4 Installation Manual page 41

The water circuit guidelines and diagrams are for illustrative purposes and are to be used for references only; not all components and accessories
local, state, and federal codes.
Installing Third-Party Accessories
For Hydro Kit terminal connection information on third-party valves, relays, and other control devices like thermostats, see the Wiring section.
Also, review the instructions provided with the third-party components.
Domestic Hot Water Tank
When selecting a water tank, ALWAYS use an INDIRECT tank where the Hydro Kit water circuit is isolated from the domestic water system. Failure
to follow instructions will result in product malfunction.
• The domestic hot water tank is for sanitary applications and uses the indirect heat exchange method for heating;
like ethylene glycol to its water.
• The tank must be installed at a level location.
• Water quality must comply with all local, state, and federal require-
ments.
• The water supply and drain must be located near the domestic hot
water tank for easy access and maintenance.
• To remove any impurities and ensure clean hot water, thoroughly
wash out the inside of the domestic hot water tank before and after
installation.
When using the Hydro Kit in domestic hot water tank applications,
a recirculation pump is recommended for install. A recirculation
pump helps prevent cold water at the end of the hot water supply
from infiltrating the water piping, and stabilize the water temperature
inside the tank.
The recirculation pump must operate before there is a demand for
domestic hot water and not during; therefore, install an external timer to determine when the recirculation pump must turn on and off.
Calculate the Operating Duration of the Recirculation Pump as follows:
Duration Time (minute) = k * V / R
k: 1.2 ~ 1.5 is recommended. (If the distance between the pump and tank is long, choose the higher number.)
V: Volume of the Domestic Hot Water Tank (gallon [liter])
R: Water Flow Rate of Pump (gallon per minute [liter per minute]), which is determined by the pump performance curve.
Three-Way Valve - for Diverting Hot Water Between Domestic Hot Water and Space Heating / Cooling or Floor Heating
Refer to valve manufacturer's installation instructions.
Two-Way Isolation Valve - for Floor Heating
Refer to valve manufacturer's installation instructions.
Three-Way Valve (Solar Heating Kit) - for Diverting Hot Water Between Domestic Hot Water and Space Heating / Cooling
or Floor Heating
Refer to valve manufacturer's installation instructions.
INSTALLING THE WATER CIRCUIT
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 Life's Good" is a registered trademark of LG Corp.
Water Circuit Components
Figure 23: Recirculation Pump with Domestic Hot Water Tank.
Hot Water
Water Out
Water In
Domestic Hot
Water Tank
do not add antifreeze
Shower
(Using the
Hot Water)
Recirculation
Pump
External
Timer
Water Supply
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