Quick Setup Guide

9
Installation Checklist
Major Component Rough-In
Description Check
Multi F / Multi F MAX 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 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
heat recovery units (for Heat Recovery systems only). 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 psi while brazing).
15 % silver brazing material only.
Refrigerant Piping Design and System
Description Check
You must have in your possession a copy of the “As-Designed” LATS Multi F / Multi F MAX 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 / Multi F
MAX PIPING TREE DIAGRAM. Installer must receive change autho- rization 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, off-sets, 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.
Pipe insulation was not compressed at any point.
Y-branch and header fittings were properly INSTALLED per details provided in the Multi F / Multi F MAX
Outdoor Unit Installation Manual.
Y-branch and header fittings were properly SUPPORTED per details provided in the Multi F / Multi F MAX
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 inches of straight pipe was installed between each elbow, and Y-branch or header
fitting, and between two Y-branch fittings.
Condensate Pump / Drain Installation
Description Check
Condensate piping installed correctly on indoor units. Material used is acceptable under local code. Insulated as necessary to
prevent condensation.
Minimum 3/4 inch, maximum 1 inch condensate piping installed on indoor units – material used is acceptable under local
code. Insulated to prevent condensation.
All condensate vertical risers are equal to or less than 27-1/2 inches from the bottom of the indoor unit.
Indoor units with condensate pumps were level. Units with gravity drains were level or slightly canted toward the drain
connection and are supported properly.
Pumped condensate drain lines were properly connected (do not have traps, and connect to the top surface of the main drain
line).
All condensate lines were properly insulated to prevent condensation.
Outdoor unit’s gravity condensate drain line is connected and routed where it properly drained away or, if installed in a
mechanical room, is connected and properly routed to a drain terminal.