Refrigerant Piping - LG MULTI V ARNU073TUD4 Installation Manual

Ceiling cassette indoor unit

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Engineering manual (136 pages)

Installation manual (75 pages)

Engineering manual (108 pages)

Table Of Contents

Table of Contents

For Existing Ceilings

1. Use anchors when installing the indoor unit in an existing ceiling.

2. Ceiling height is shown on the side of the installation guide (template). Adjust the height of the unit accordingly. Adjust the clearance

before hanging the indoor unit.

3. Remove the temporary washer plate and position the indoor unit hanger brackets on the bolts. Secure with nuts and washers on the top

and bottom of the hanger brackets.

4. Ceiling-cassette indoor units are equipped with a built-in drain pump and float switch, therefore, the unit must be installed horizontally or

condensate will drip out and cause product malfunction. Measure the unit at each corner to verify that it is level.

5. Remove the installation guide (template).

Piping Materials and Handling

Pipes used for the refrigerant piping system must include the specified thickness, and the

interior must be clean.

While handling and storing,

contaminate the interior with dust, moisture, etc.

Keep refrigerant pipe dry, clean, and airtight.

No moisture should be inside the piping.

- Significant hydrolysis of refrigerant oil.

Possible

- Refrigerant oil degradation.

Problems

- Poor insulation of the compressor.

- System does not operate properly.

- EEVs, capillary tubes are clogged.

Solutions - Remove moisture from the piping.

- Piping ends should remain capped until

connections are complete.

Do not install piping on a rainy day.

- Connect piping properly at the unit's side.

- Remove caps only after the piping is

cut, the burrs are removed, and after

passing the piping through the walls.

- Evacuate system to a minimum of 500

microns and insure the vacuum holds at

that level for 1 hour.

do not bend or damage the pipes, and take care not to

No dust should be inside the piping.

Moisture

- Refrigerant oil degradation.

- Poor insulation of the compressor.

- System does not operate properly.

- EEVs and capillary tubes become

clogged.

- Remove dust from the piping.

- Piping ends should remain capped until

connections are complete.

- Connect piping properly at the side of

the unit.

- Remove caps only after the piping is cut

and burrs are removed.

- Retain the cap on the piping when

passing it through walls, etc.

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