Installation Checklist - LG Multi V water mini Series Installation Operation & Maintenance

Table of Contents

Major Component Rough-In

Description

All Multi V water source 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).

Indoor units are installed, properly supported, and located indoors in a non-corrosive environment.

Duct work installation completed (ducted indoor units only).

Water source unit's gravity condensate drain line was connected and properly routed to a drain terminal.

Piping and Insulation

Description

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 are 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-branch fittings or headers were used as per LATS Multi V report.

(Optional) Full port ball valves for all indoor units. (Schrader between the valve body and the indoor units.)

Brazing Practices

Description

Use medical grade (there are 4 available) dry nitrogen for purging during brazing (constant 3 psi while brazing).

Minimum 3/4", maximum 1" condensate piping installed on indoor units–material used is acceptable under local code. Insulated

as necessary to prevent condensation.

Installation

(For more information on any procedure, refer to the detail provided in the Water Source and Indoor Unit Installation Manuals.)

Refrigerant Piping

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.

All long runs of straight pipe were provided with expansion loops.

Insure Y-branch fittings are installed with no more than ±10° of horizontal.

Insure Y-branch fittings are installed with no more than ±3° of vertical.

Insure all Header fittings are installed horizontal at an elevation above all connected indoor units.

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.

Insure all field made flares are 45°. Use factory-supplied flare nuts only.

All pipe segments were properly supported and all wall penetrations were sleeved.

All pipe insulation is not compressed at any point.

Y-branch and headers fittings were properly supported per details provided in the Water Source Unit Installation Manual.

Insure Y-branch fittings 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 specialities are present.

(Optional) High quality R410A rated full port ball valves with a Schrader port were used at all indoor units and at will in the

refrigerant piping network. (Recommended for serviceability.)

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.