background image

3

Typical Cassette Unit Installation

Installing the Indoor Unit

Mounting the IDU Chassis
•  The ceiling should be strong and solid enough to prevent indoor unit vibration.

•  Install the unit with a slight slope towards the drainage point to ensure condensate drains 

easily.

•  Select and mark the areas where the hanging bolts should be placed.

WARNING

The threaded rod hangers (bolts) and hardware must be securely tightened to prevent the 

unit from falling from its installation location.

There is a risk of personal injury or death from falling equipment.

•  Drill the holes and install the hanging bolts (threaded rods).

•  Position the IDU and secure to the hanging bolts. Use a level to ensure the IDU is level with 

a slight slope to the drainage point.

Flat washer for M10

(accessory)

Flat washer for M10

(accessory)

Hanging bolt

(W3/8 or M10)

Nut

(W3/8 or M10)

Nut

(W3/8 or M10)
Spring washer

(M10)

Drill Holes for Threaded Rods

Hang Indoor Unit on Threaded Rods

Connecting Refrigerant Pipes

Refrigerant Pipe Connections

Indoor units come with flare type connections.  It is the installer’s option to use the flare fittings provided or braze the indoor unit to the  

refrigerant piping system.

Flare Fittings
•  All unit flare fittings are 45° and are rated for high-pressure R410A refrig-

erant.

•  Properly form all flare fittings using best practices.

•  Place a drop of PVE oil on the outside of flare fitting before tightening.

Note:

Multi V refrigeration system components contain very small capillary tubes, small 

orifices, electronic expansion valves, oil separators, and heat exchangers that can 

easily become blocked. 

Note:

•   Do not use any other type of oil (including traditional POE refriger-

ation oil) as a lubricant. Failure to follow this procedure may lead to 

restrictions in the refrigeration components.

•   Do not over-tighten flare nuts. Excessive tightening will cause 

fittings to crack.

Insulate Refrigerant Pipes

Sufficiently insulate all cold surfaces to prevent moisture forming. All pipes must be insulated and each pipe must be separately 

wrapped. Use field-provided one-half (1/2) inch thick (or thicker) closed-cell insulation. The thickness may need to be increased 

based on ambient conditions and local codes.

Wrap all refrigerant and condensate piping. Glue all insulation joints with no air gaps between insulation segments, and between 

insulation segments and the unit case. Ensure insulation material fits snugly against the refrigeration pipe with no air space be-

tween the pipe surface and the surrounding insulation.

Protect insulation inside hangers and supports with a second insulation layer. Ensure insulation on all pipe passing through pipe 

hangers, inside conduit, and/or sleeves is not compressed.

Typical Refrigerant Line Flare Fitting Insulation Detail

No Clearance

Overlap Insulation Where the

Port and the Piping Meet 

Insulation for Indoor Unit Port

(Field Supplied) Insulation for Refrigerant

Piping (Field Supplied)

Insulation Clip (Field Supplied)

Brazing
•  Use a dry nitrogen purge operating at a minimum pressure of three (3) psig 

and maintain a steady flow.

•  Use a 15% silver phosphorous copper brazing alloy to avoid overheating and 

produce good flow.

•  Protect isolation valves, electronic expansion valves, and other heat-sensi-

tive components from excessive heat with a wet rag or heat barrier spray.

Set screw (4)

for paper pattern

Paper pattern

Ceiling board

Ceiling 

Distance of bolt

from bracket: 1-1/2

Open ceiling board

along outer edge

of paper pattern

Ceiling Cassette

Chassis

Ceiling board

Distance between chassis

and ceiling surface:

19/32 for TM/TN/TP chassis

1-7/32  to 1-11/32 for TQ/TR chassis

Unit: inch

5-7/8 (TM/TN/TP/TQ/TR chassis)

3-9/16 (TL chassis)

2-3/16 (TU/TT chassis)

Содержание LCN188HV4

Страница 1: ...em malfunction Do not install the unit in a noise sensitive area Periodically check that the frame is not damaged There is a risk of equipment damage Install the unit in a safe location where nobody can step on or fall onto it Do not install the unit on a defective stand There is a risk of unit and property damage Install the drain hose to ensure adequate drainage There is a risk of water leakage ...

Страница 2: ...ilation products on the chassis of the unit Do not install the unit near high frequency generator sources Do not install in an area where the unit will be exposed to volatile organic compounds Installing in an Area Exposed to Unconditioned Air In some installation applications areas floors walls in some rooms may be exposed to unconditioned air The room may be above or next to an unheated garage o...

Страница 3: ...strictions in the refrigeration components Do not over tighten flare nuts Excessive tightening will cause fittings to crack Insulate Refrigerant Pipes Sufficiently insulate all cold surfaces to prevent moisture forming All pipes must be insulated and each pipe must be separately wrapped Use field provided one half 1 2 inch thick or thicker closed cell insulation The thickness may need to be increa...

Страница 4: ...fire electric shock explosion physical injury or death WARNING The information contained in this manual is intended for use by a trained electrician familiar with applicable local codes and the U S National Electric Code NEC and who is equipped with the proper tools and test instruments Failure to carefully read and follow all instructions in this manual can result in personal injury or death Conn...

Страница 5: ...d Communications Cable Terminals Optional Wired Wall Controller Installation Since the room temperature sensor is inside the remote controller to maintain proper space temperature install the remote controller in a place away from direct sunlight high humidity and direct supply of hot or cold air Install the remote controller about 5 ft above the floor in an area with good air circulation and an a...

Страница 6: ...trations data information and other materials are the property of LG Electronics U S A Inc and are disclosed by LG Electronics U S A Inc only in confidence 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 ...

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