Piping Insulation - LG LC097HV4 Engineering Manual

Refrigerant Piping System Insulation
All refrigerant piping including connections, field-provided isolation ball valves, service valves, and elbows shall be completely insulated
using closed cell pipe insulation.
To prevent heat loss/heat gain through the refrigerant piping, all refrigerant piping including liquid lines and vapor lines shall be insulated sep-
arately. 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.
Pay special attention to insulating the pipes installed in the ceiling plenum.
The design engineer should perform calculations to determine if the factory-supplied insulation jackets are sufficient to meet local codes and
avoid sweating. Maximum refrigerant piping temperature is +227°F; minimum refrigerant piping temperature is -4°F. Add additional insulation
if necessary. Check the fit of the insulation jacket after the header fitting and all run-out pipes are installed. Mark all pipes at the point where
the insulation jacket ends. Remove the jacket. Install field provided insulation on the run-out and main trunk pipes first. Install the LG-pro-
vided insulation plugs on the ends of all unused header ports. 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 oz. of R410A per foot. The factory charge
accommodates pipe lengths up to the standard length without
requiring refrigerant removal.
Table 44: Charging Capacity.
Capacity
(Btu/h)/Model
Vapor
9k LC097HV4,
3/8
12k LC127HV4
18k LC187HV,
5/8
24k LC247HV
36k LH367HV,
5/8
42k LH427HV
INSTALLATION & LAYOUT BEST PRACTICES
Pipe Size
Standard
Length (ft)
Liquid
1/4 24.6
3/8 24.6
3/8 24.6
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.
Refrigerant Piping System Layout
If you are uncertain of the unit charge, reclaim, evacuate and weigh in
the correct charge using the unit nameplate (capacity) charge adjusting
for line sets longer than 24.6 or 41 ft. This will prevent any interruptions
to the functioning of the unit and possible damage.
Example: A 50 ft line set is used --
9 additional feet x 0.22 oz per ft = Add 1.98 oz
of R410A
Max. Max.
Elevation (ft) Length (ft)
49 66
98.4 164
98.4 246
Min. Additional
Length (ft) Refrigerant (oz/ft)
6.6 0.22
6.6 0.43
6.6 0.43
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