Refrigerant Pipe Connections - LG Multi V water mini Series Installation Operation & Maintenance

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Table Of Contents

Table of Contents

Before connecting the piping:

• Remove the front panel.

• Check all pipes (liquid and vapor).

Water Mini Unit Service Valves

1. Field piping.

2. Flare nut.

3. Ball type service valves.

Note:

Do not expose the service valves of the water source unit to heat. Protect the service valve with a

wet towel during brazing.

Operating the Service Valves

1. Loosen or tighten the flare nut by using a torque wrench and backup wrench. Coat the flare

connection with polyvinyl ether (PVE) refrigeration oil.

2. Remove service valve cap. To operate the shutoff valve, turn ball valve stem 90° using an

open-end wrench. Always backseat the valve. After operation, always replace the caps (Tight-

ening torque of service valve cap: =18.0 lb-ft).

3. Evacuate the system, and then charge the refrigerant using the Schrader valve. Reattach the

Schrader valve cap after servicing is complete. (Tightening torque of service cap: =10.0 lb-ft).

• The unit ships with a factory charge of

refrigerant. When connecting and braz-

ing the vapor line, protect the service

and Schrader valves from excessive

heat using a wet rag or cooling gel

product.

• After connections are complete, verify

that the service ports and caps are

securely tightened to prevent leaking

refrigerant gas.

Note:

• When connecting the refrigerant piping, make sure the service valves of the water source unit are completely closed (factory setting). Do not open the service valves or

attempt to operate the system until the refrigerant pipe system installation has been completed. Never open the valves before a pressure test is performed, the system is

evacuated, a leak test performed, and the Commissioning Agent provides authorization to do so.

• Do not use polyolester (POE) or any other type of mineral oil as a thread lubricant. If introduced to the refrigerant circuit, will create oil sludge leading to system malfunction.

• Use steel wool or comparable material to fill gaps between the unit case and the refrigerant and electrical connections to prevent rodent and animal entry.

• Always take extreme caution to prevent refrigerant gas (R410A) from leaking during use, around fire or flame, and during brazing. If the refrigerant gas comes in contact

with a flame from any source, it may break down and generate a poisonous gas. Never braze in a room that is not ventilated. After refrigerant piping work is complete,

securely tighten both service and Schrader valves to help prevent refrigerant gas from leaking. Verify the system is free of leaks after refrigerant piping installation is

complete.

• Do not attempt to remove the service valve stem and packing or Schrader valve core. Physical injury or death may occur from the uncontrolled rapid release of refrigerant.

4. Schrader valves.

5. Liquid pipe.

6. Vapor pipe.

Figure 31: Service Valves - Open and Closed Positions.

Indicates "open" when the pipe and

the "flats" of the valve stem are parallel.

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

REFRIGERANT PIPING DESIGN

Figure 29: Water Mini Unit Front Panel.

Capped

3/4 Vapor Pipe

3/8 Liquid Pipe