LG ARNH963K2A2 Installation Manual page 28

rouGHING-IN
Water Piping
Water Piping Procedure Installation
For the water pipe system, use the closed loop type. Refer to Figure 18 on page 27 when following the procedure below.
1. Select parts that exceed water pressure specifications needed for the Hydro Kit.
2. Use anti-corrosion, steel pipe or copper pipe for water piping.
• For K3 Chassis Hydro Kit: It is recommended that non-ferrous piping be used to reduce the frequency of strainer maintenance and heat
exchanger cleaning.
3. Install a die-electric union fitting where "dissimilar" pipe materials are used. Otherwise install a standard union joint.
4. Install the hose bib fittings.
5. Always, install a Water Circuit Strainer which is provided with the Hydro Kit and place it on the water inlet pipe. For specific steps on
installation, see "Strainer Installation" on page 30 of this installation manual.
• If a replacement strainer is needed, we recommend purchasing an OEM replacement from LG. See specifications for the strainer in the
Installation Parts section in Table 3 on page 13 of this installation manual.
6. Install the air vent in the section of the pipe with the highest elevation. This prevents air from gathering in the pipe system that could po-
tentially impede the flow of water in the system. If the water flow drops, an error code will appear on the Hydro Kit Wall Mounted Controller
display.
7. Use proper size insulation as outlined by insulation manufacturer.
8. Install a pressure relief valve that meets the design water pressure to prevent unit or water pipe damage as the pressure increases inside
the water pipe system.
9. Install isolation valves on the inlet pipe upstream of the strainer and to the outlet pipe of the heat exchanger in order to facilitate heat
exchanger and strainer cleaning.
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