Refrigerant Piping System Layout - LG LS090HSV4 Engineering Manual

Single zone high efficiency wall mount

Installation manual (56 pages)

Installation manual (56 pages)

Table of Contents

inSTAllATion & lAyoUT beST PrAcTiceS

installation of refrigerant Piping / brazing Practices

It is imperative to keep the piping system free of contaminants and debris such as copper burrs, slag, or carbon dust during installation.

All joints are brazed in the field. Duct-free Split Single Zone Inverter refrigeration

system components contain very small capillary tubes, small orifices, electronic

expansion valves, oil separators, and heat exchangers that can easily become

blocked. Proper system operation depends on the installer using best practices

and utmost care while assembling the piping system.

• While brazing, use a dry nitrogen purge operating at a minimum pressure of three

(3) psig and maintain a steady flow.

• Blow clean all pipe sections with dry nitrogen prior to assembly.

• Use a tubing cutter, do not use a saw to cut pipe. De-burr and clean all cuts

before assembly.

• Store pipe stock in a dry place. Keep pipe capped and clean.

• Use adapters to assemble different sizes of pipe.

• Do not use flux, soft solder, or anti-oxidant agents.

• Use a 15% silver phosphorous copper brazing alloy to avoid overheating and produce good flow.

• Protect isolation valves, electronic expansion valves, and other heat-sensitive control components from excessive heat with a wet rag or a

heat barrier spray product.

refrigerant Piping System insulation

All refrigerant piping including Y-branch and header connections, field-provided isolation ball valves, service valves, and elbows shall be

completely insulated using closed cell pipe insulation. The liquid and vapor lines must be insulated separately.

To prevent heat loss/heat gain through the refrigerant piping, all refrigerant piping including liquid lines and vapor lines shall be insulated

separately. Insulation shall be a minimum 1/2" thick, and thickness may need to be increased based on ambient conditions and local codes.

All insulation joints shall be glued with no air gaps. Insulation material shall fit snugly against the refrigeration pipe with no air space between

it and the pipe. Insulation passing through pipe hangers, inside conduit, and/or sleeves must not be compressed. Protect insulation inside

hangers and supports with a second layer. All pipe insulation exposed to the sun and outdoor elements shall be properly protected with PVC,

aluminum vapor barrier, or alternatively placed in a weather-resistant enclosure such as a pipe rack with a top cover, and meet local codes.

The design engineer should perform calculations to determine if the factory-supplied insulation jackets are sufficient to meet local codes and

avoid sweating. Add additional insulation if necessary. Mark all pipes at the point where the insulation jacket ends. Remove the jacket. Install

field provided insulation on the run-out and main truck pipes first. Peel the adhesive glue protector slip from the insulation jacket and install

the clam-shell jacket over the fitting.

charging

Each outdoor unit is factory charged (nameplate charge) for the

evaporator as well as a standard 25 ft line. Any time a line set is

used longer then the standard 25 ft line set length, the refrigerant

charge has to be adjusted.

You must adjust the charge based on how many feet of piping are

added based on 0.22 or 0.38 oz of R410A per foot. The factory

charge accommodates pipe lengths up to the standard length without

requiring refrigerant removal.

Table 24: Charging Capacity

Capacity

(Btu/h)/Model

Vapor

9k, 12k/HSV4

3/8

18k/HSV4

5/8

Pipe Size

Standard

Length (ft)

Liquid

1/4

3/8

24.6

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