MULTI
F
MAX
MULTI
F
Due to our policy of continuous product innovation, some specifications may change without notification.
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INSTALLATION CHECKLIST
PAGE 1
Major Component Rough-In
Description
Check
All Multi F / Multi F MAX outdoor units were connected properly per local code and the product installation procedures.
All literature and bagged accessories have been removed from the fan discharge.
Indoor units and branch distribution unit(s) (Multi F MAX only) are installed, properly supported, and located indoors in a non-
corrosive environment.
Multi F / Multi F MAX gravity condensate drain line was connected and routed where it properly drains away or, if installed in a
mechanical room, was connected and properly routed to a drain terminal.
Piping and Insulation
Description
Check
Copper
Over 5/8 inches—Rigid ACR only.
5/8 inches and under—Can use soft ACR.
15% silver brazing material only.
All refrigerant pipes and valves were insulated separately. Insulation butts up against the walls of the indoor units. No gaps or
cracks. Insulation was not compressed at clamps and hangers.
LG Y-branches were used per manufacturer’s recommendations.
(Optional) Full port ball valves for all indoor units. (Schrader between the valve body and the indoor units.)
Condensate piping installed on indoor units–material used is acceptable under local code. Insulated as necessary to prevent
condensation.
Brazing Practices
Description
Check
Medical grade (there are 4 available) dry nitrogen for purging during brazing was used (constant 3 psi while brazing).
Installation
(For more information on any procedure, refer to the detail provided in the Indoor Unit Installation Manuals.)
Refrigerant Piping
Description
Check
Have in possession a copy of the “As-Designed” LATS Multi F 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 PIPING TREE DIAGRAM. Installer must receive change authori-
zation 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.
All long runs of straight pipe were provided with expansion loops.
Ensure Y-branches are installed with no more than ±5° of horizontal.
Ensure Y-branches are installed with no more than ±3° of vertical.
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 were properly supported and all wall penetrations were sleeved.
Pipe insulation was not compressed at any point.
Y-branches were properly supported per details provided in the installation manual.
Ensure Y-branches are installed in the correct direction. Flow is always from the single end to the double end.
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 network.
Best practice including a minimum of 20″ of straight pipe was installed between each elbow.
