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Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
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MAX
MULTI
F
MULTI
F
Major Component Rough-In
Description
Check
The 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 only, with or without LGRED) are installed, properly supported, and
located indoors in a non-corrosive environment.
Piping Material, Components, and Insulation
Description
Check
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 only, with or without LGRED). No gaps shown. Insulation was not compressed at clamps
and hangers.
Brazing Practices
Description
Check
Use medical grade dry nitrogen for purging during brazing (constant 3 psig while brazing).
15% silver brazing material only.
Refrigerant Piping
Description
Check
You must have in your possession a copy of the “As-Designed” LATS 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 F 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 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 or without LGRED) Outdoor Unit
Installation Manual.
Y-branch fittings were properly SUPPORTED per details provided in the Multi F / Multi F MAX (with or without LGRED) Outdoor
Unit Installation Manual.
No oil traps, solenoid valves, sight glasses, filter driers, or any other unauthorized refrigerant specialties were present.
(Optional) R410A rated full port ball valves were used at all indoor units and wherever appropriate in the refrigerant piping net-
work.
INSTALLATION CHECKLIST
System ID No.: _________________________________________________ Indoor Unit ID.: ____________________________________
Checked by: __________________________________ Date:__________________ Signature: ___________________________________
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