LG ARUM072BTE5 Installation Manual page 172

Major Component Rough-In
Description
All Multi V outdoor units are connected properly per local code and the product installation procedures.
All literature and bagged accessories have been removed from the fan discharge (ducted and cassette model indoor units).
All indoor units and heat recovery units (for Heat Recovery systems only) are installed, properly supported, and located indoors in
a non-corrosive environment.
Duct work installation completed (ducted indoor units only).
Piping Material, Components, and Insulation
Description
Heat recovery systems: LG prefers the use of ACR hard drawn copper on pipe segments located between heat recovery units and
outdoor units, between heat recovery units piped in series, and between heat recovery units and multiple indoor units sharing an
heat recovery unit port.
Heat pump systems: LG prefers the use of ACR hard drawn copper for all pipe segments in the piping system except segments
located between Y-branch fittings (or header fittings) and indoor units.
DOAS Units: LG prefers the use of hard drawn copper in pipe segments connecting a DOAS products and an outdoor unit.
LG Y-branch fittings or headers were used as per LATS Multi V report.
All refrigerant pipes and valves were insulated separately. Insulation is positioned up against the walls of the indoor units and heat
recovery units (for Heat Recovery systems only). No gaps shown. Insulation was not compressed at clamps and hangers.
Brazing Practices
Description
Use medical grade dry nitrogen for purging during brazing (constant 3 psig while brazing).
15% silver brazing material only.
Minimum 3/4 inch, maximum 1 inch condensate piping installed on indoor units – material used is acceptable under local code.
Insulated to prevent condensation.
Refrigerant Piping Design and System
Description
You must have in your possession a copy of the "As-Designed" LATS Multi V piping tree diagram. BEFORE ANY FIELD PIPE SIZE
OR LENGTH CHANGES ARE MADE, PROPOSED CHANGES MUST BE FORWARDED TO THE DESIGN ENGINEER SO THAT
THEY CAN INPUT THE CHANGES INTO LATS and RE-ISSUE A NEW LATS MULTI V PIPING TREE DIAGRAM. Installer must
receive change authorization from the design engineer, because any change made requires the review of the entire tree diagram
and verification that the change did not impact the size of piping segments in other parts of the system.
All pipe materials were properly stored, capped, and clean. All burrs were removed after cutting and pipe ends were reamed before
brazing.
During refrigerant pipe installation, for each segment of pipe, a record was made of the pipe length (including expansion loops,
offsets, double-back sections), and sizes, as well as the quantity and type of elbows used.
Expansion loops, coils or other acceptable measures are provided where necessary to absorb temperature-change based pipe
movement.
A torque wrench and backup wrench were used to tighten all flare connections.
The back side of all flares were lubricated with a small drop of PVE refrigeration oil before tightening flare fittings.
Ensure all field made flares are 45°. Use factory-supplied flare nuts only.
Pipe segments, Y-branches, and/or header fittings are secured to the structure using a combination of fixed and floating clamps,
and all wall penetrations were sleeved.
All pipe insulation is not compressed at any point.
Y-branch and header fittings were properly INSTALLED per details provided in the Multi V Outdoor Unit Installation Manual.
Y-branch and header fittings were properly SUPPORTED per details provided in the Multi V Outdoor Unit Installation Manual.
No oil traps, solenoid valves, sight glasses, filter driers, or any other unauthorized refrigerant specialties are present.
(Optional) High quality R-410A rated full port ball valves (Schrader between the valve body and the indoor units) used at all indoor
units and at will in the refrigerant piping network.
Best practice includes a minimum of 20" of straight pipe was installed between each elbow, and Y-branch or header fitting, and
between two Y-branch fittings.
Inverted traps on vapor lines installed if required per installation manual.
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.
INSTALLATION CHECKLIST
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