Major Component Rough-In; Piping Material, Components, And Insulation; Brazing Practices; Installation Checklists And Worksheets - LG MULTI F Series Installation Manual
Multi-zone heat pump systems with lgred 1.5 to 3.5 tons
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Also See for MULTI F Series:
- Engineering manual (392 pages) ,
- Installation manual (104 pages) ,
- Owner's manual (234 pages)
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Major Component Rough-In
Description
Multi F / Multi F MAX with LGRED outdoor unit was 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 branch distribution unit(s) (Multi F MAX with LGRED 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
Multi-zone duct-free split systems: ACR copper piping rated at the system working pressure was used.
LG Y-branch fitting was used per manufacturer's recommendations.
All refrigerant pipes and valves were insulated separately. Insulation is positioned up against the walls of the indoor units and
branch distribution units (Multi F MAX with LGRED 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.
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.
Pipe segments and Y-branch fittings are secured to the structure using a combination of fixed and floating clamps, and all wall
penetrations were sleeved.
Pipe insulation was not compressed at any point.
Y-branch fittings were properly INSTALLED per details provided in the Multi F / Multi F MAX with LGRED Outdoor Unit Installation
Manual.
Y-branch fittings were properly SUPPORTED per details provided in the Multi F / Multi F MAX with LGRED Outdoor Unit Installa-
tion Manual.
No oil traps, solenoid valves, sight glasses, filter driers, or any other unauthorized refrigerant specialties were 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.
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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