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50

MUL

T

I F / MUL

TI F MAX Outdoor Unit Installation Manual

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.

MULTI 

F

MAX

MULTI 

F

INSTALLING MULTI F MAX SYSTEMS

0XOWL)0$;5HIULJHUDQW3LSLQJ&RQQHFWLRQV3LSLQJ5RXWHV

For Multi F MAX outdoor units, piping can be installed in one of four directions: front, side, back, and down (A). If the downward installation is 
chosen, the knockout hole in the base pan must be accessed (B). 
Whatever direction is chosen, plug the access holes with field-provided putty or insulation to fill all gaps (C). 

,QVHFWVRUVPDOODQLPDOVHQWHULQJWKHRXWGRRUXQLWZLOOFDXVHDVKRUWFLUFXLWLQWKHHOHFWULFDOER[ZKLFKZLOOOHDGWR¿UHHOHFWULFVKRFNSK\VLFDOLQMXU\

or death.

Insects or small animals entering the outdoor unit will cause a short circuit in the electrical box, which will lead to unit failure.

Multi F MAX Outdoor Unit System Piping Connections

Outdoor Unit Piping Connections

LMU480HV, LMU540HV, LMU600HV

Liquid Line Connection (in., OD) x Qty.

Ø3/8 x 1

Vapor Line Connection (in., OD) x Qty.

Ø3/4 x 1

Avoid Pipe Damage

• When routing field-provided piping, 

avoid damaging the outdoor unit from exces-

sive vibration.  

• Properly insulate the liquid and gas lines separately up to the point of connection at 

the unit frame.

• See table below for Multi F MAX outdoor unit connection types.

Table 24: Multi F MAX Outdoor Unit Piping Connections.

Figure 48: Multi F MAX Piping Installation.

Correctly route the piping so it does not make contact with mounting bolts. Allow room 

IRU¿HOGLQVWDOODWLRQ

Front

Side

Back

Knockout Hole

Base Pan

Down

Gas Piping

(Bigger Diameter) 

Liquid Piping

(Smaller Diameter)

Putty or Insulation (field-supplied)

Drain Hose

Wire

Connection Pipe

A

B

C

Torque

Wrench

 

When tightening the 
piping connection, 
firmly hold the flare nut.

Figure 49: Multi F MAX Outdoor Unit Refrigerant Pipe 

Connections.

Summary of Contents for LMU18CHV

Page 1: ...MULTI FMAX MULTI F OUTDOOR UNIT INSTALLATION MANUAL Multi Zone Heat Pump Systems 1 5 to 5 Tons Dual and Tri Zone Multi F Quad Zone Multi F Eight Zone Multi F MAX ...

Page 2: ...e for future reference Content familiarity is required for proper installation The instructions included in this manual must be followed to prevent product malfunction property damage injury or death to the user or other people Incorrect operation due to ignoring any instructions will cause harm or damage The level of seriousness is classified by the symbols described by the summary list of safety...

Page 3: ...g Copper Piping 37 Copper Expansion and Contraction 38 40 Piping Handling 41 Refrigerant System Engineering 42 45 Flaring and Brazing Procedures 46 47 Refrigerant Piping System Installation 48 56 Refrigerant Piping Insulation 57 59 Electrical System Installation 60 75 General Information 60 RQQHFWLRQV DQG 6SHFL FDWLRQV 61 64 Installation 65 75 Final Installation Procedures 76 90 Triple Leak Pressu...

Page 4: ...posure to high concentration levels of refrigerant gas will lead to illness or death Periodically check that the outdoor frame is not damaged There is a risk of explosion physical injury or death If the air conditioner is installed in a small space take measures to prevent the refrigerant concentration from exceeding safety limits in the event of a refrigerant leak Consult the latest edition of AS...

Page 5: ...lls Always check for system refrigerant leaks after the unit has been installed or serviced Low refrigerant levels will cause product failure The branch distribution BD unit must be installed indoors Do not install the BD box in a highly humid environment There is risk of product failure and property damage Do not make refrigerant substitutions Use R410A only If a different refrigerant is used or ...

Page 6: ... DQG FDXVH D UH 6HFXUH DOO HOG ZLULQJ FRQQHFWLRQV ZLWK DSSURSULDWH ZLUH strain relief Improperly securing wires will create undue stress on equipment power OXJV QDGHTXDWH FRQQHFWLRQV ZLOO JHQHUDWH KHDW FDXVH D UH DQG SK VL cal injury or death Ensure the system is connected to a dedicated power source that provides adequate power If the power source capacity is inadequate or the electric work is no...

Page 7: ... death If refrigerant leaks out ventilate the area before operating the unit If the unit is mounted in an enclosed low lying or poorly ventilated area DQG WKH V VWHP GHYHORSV D UHIULJHUDQW OHDN LW ZLOO FDXVH D UH HOHFWULF shock explosion physical injury or death To avoid physical injury use caution when cleaning or servicing the air conditioner There is risk of electric shock physical injury or de...

Page 8: ...ling Concealed Duct Low Static Indoor Unit HN Ceiling Concealed Duct High Static Indoor Unit QN Low Wall Console Indoor Unit VN Vertical Horizontal Air Handling Indoor Unit U Outdoor Unit L LG 07 7 000 09 9 000 12 12 000 15 15 000 18 18 000 24 24 000 30 30 000 36 36 000 48 48 000 54 54 000 L Type M Multi Zone Voltage for all equipment is 208 230V 60 Hz 1 phase All indoor units are compatible with ...

Page 9: ...246 1 246 1 Maximum Outdoor Unit to Indoor Unit Piping ft 82 0 82 0 82 0 82 0 Piping Length No Additional Refrigerant ft 49 2 73 8 98 4 98 4 Maximum Elevation between Outdoor Unit and Indoor Unit ft 49 2 49 2 49 2 49 2 Maximum Elevation between Indoor Unit and Indoor Unit ft 24 6 24 6 24 6 24 6 Table 1 0XOWL 2XWGRRU 8QLW 6SHFL FDWLRQV 1 Rated capacity applied with non ducted indoor units and is ra...

Page 10: ...4 0 09 0 59 2 00 2 5 LMU30CHV 16 6 25 1 10 8 0 12 0 73 2 40 3 LMU36CHV 17 9 25 1 11 2 0 12 0 73 3 20 Voltage tolerance is 10 Maximum allowable voltage unbalance is 2 RLA Rated Load Amps MCA Minimum Circuit Ampacity Maximum Overcurrent Protection MOP is calculated as follows Largest motor FLA x 2 25 Sum of other motor FLA rounded down to the nearest standard fuse size Indoor Fan Motor FLA is based ...

Page 11: ...uld be grounded in accordance with the local regulations or applicable national codes 3 All electrical components and materials to be supplied on the site must comply with the local regulations or international codes 4 Electrical characteristics chapter should be considered for electrical work and design Especially the capacity of power cable and circuit breaker for outdoor unit should be more tha...

Page 12: ...oduct box 2 Unit should be grounded in accordance with the local regulations or applicable national codes 3 All electrical components and materials to be supplied on the site must comply with the local regulations or international codes 4 Electrical characteristics chapter should be considered for electrical work and design Especially the capacity of power cable and circuit breaker for outdoor uni...

Page 13: ... product box 2 Unit should be grounded in accordance with the local regulations or applicable national codes 3 All electrical components and materials to be supplied on the site must comply with the local regulations or international codes 4 Electrical characteristics chapter should be considered for electrical work and design Especially the capacity of power cable and circuit breaker for outdoor ...

Page 14: ... Unit Pipe Length ft 229 6 229 6 229 6 Max Main Piping Length No Additional Refrigerant ft 16 16 16 Max Branch Piping Length No Additional Refrigerant ft 131 131 147 6 Maximum Elevation between Outdoor Unit and Indoor Unit ft 98 4 98 4 98 4 Maximum Elevation between Indoor Unit and Indoor Unit ft 49 2 49 2 49 2 Maximum Elevation between BD Unit and Indoor Unit ft 32 8 32 8 32 8 Maximum Elevation b...

Page 15: ...LMU540HV 60 208 230 187 253 29 4 40 1 18 5 2 x 0 12 0 73 x 2 4 8 5 0 LMU600HV 60 208 230 187 253 32 2 45 1 20 4 2 x 0 12 0 73 x 2 5 2 Voltage tolerance is 10 Maximum allowable voltage unbalance is 2 RLA Rated Load Amps MCA Minimum Circuit Ampacity Maximum Overcurrent Protection MOP is calculated as follows Largest motor FLA x 2 25 Sum of other motor FLA rounded down to the nearest standard fuse si...

Page 16: ... LG is a registered trademark of LG Corp Supporter 4 holes for anchor bolts No 1 2 3 4 Part Name Air discharge grille Gas pipe connection Liquid pipe connection Power transmission connection 4 19 9 32 21 1 20 53 3 8 54 11 32 15 3 4 6 1 2 6 1 2 24 13 32 14 3 16 13 6 5 8 14 1 20 37 13 32 Unit inch Center of Gravity Figure 4 LMU480HV LMU540HV and LMU600HV Multi F MAX Outdoor Unit External Dimensions ...

Page 17: ...por in OD x Qty Ø3 8 x 2 Ø3 8 x 3 Ø3 8 x 4 Ø3 8 x 3 Ø1 2 x 1 Piping Lengths Maximum Total System Piping ft 4 475 7 475 7 475 7 475 7 Maximum Main Pipe Length Outdoor Unit to Branch Distribution Units ft 180 4 180 4 180 4 180 4 Total Branch Piping Branch Distribution Units to Indoor Units ft 295 3 295 3 295 3 295 3 Maximum Branch Pipe Length Between Branch Distribution Unit and Each Indoor Unit ft ...

Page 18: ...pe Service Space EEV Service Controller Service Inspection Opening Minimum 12 Minimum 12 11 23 32 9 27 32 Ø3 4 Ø3 8 Suspension Bolt Pitch 9 21 32 13 9 32 Indoor Unit Piping Direction Unit Inch Minimum 24 Minimum 24 Bottom View Minimum 15 3 4Mininum 15 3 4 Side View 5 29 32 2 27 32 11 13 16 2 3 8 1 3 16 1 31 32 4 3 8 A C and PMBD3640 D Connections Liquid Pipe Ø1 4 Gas Pipe Ø3 8 PMBD3641 D Connectio...

Page 19: ... apart and throw away plastic packaging bags so that children will not play with them and risk suffocation and death Use caution when using a forklift to transport an unpackaged unit The forklift arms must pass through the openings at the bottom Do not drop the unit when carrying it with a forklift There is a risk of the product falling and causing physical injury Consider the unit s center of gra...

Page 20: ...ironment near an ocean lake etc ensure that the site is well ventilated and has a lot of natural light Example Install on a rooftop Do Not s Where it will be subjected to direct thermal radiation from other heat sources or an area that would expose the outdoor unit to heat or steam like discharge from boiler stacks chimneys steam relief ports other air conditioning units kitchen vents plumbing ven...

Page 21: ...on a location to place the outdoor unit be sure to choose an area where run off from defrost will not accumulate and freeze on sidewalks or driveways which will create unsafe conditions Properly install and insulate any drain hoses to prevent the hose from freezing cracking leaking and causing unsafe conditions from frozen condensate PLACEMENT CONSIDERATIONS Planning for Snow and Ice continued Tie...

Page 22: ...es at the right side of the unit for service If the outdoor unit discharge side faces a wall include a minimum of 19 11 16 inches between the outdoor unit and the wall Install the outdoor unit so that the discharge port is set at a right angle to the wind direction Outdoor Unit Service Access and Allowable Clearances Appropriate airflow through the outdoor unit coil is critical for proper unit ope...

Page 23: ...IONS 6HOHFWLQJ WKH HVW RFDWLRQ IRU WKH 2XWGRRU 8QLW Minimum 12 Minimum 20 Minimum 40 Minimum 12 Maximum 20 Minimum 12 Minimum 40 Minimum 24 Obstacles above and on the air intake side Obstacles above on the air intake side and on both left and right sides Minimum 20 Minimum 20 Minimum 20 Minimum 40 Obstacle just on the air discharge side Obstacles above and on the air discharge side Clearance Requi...

Page 24: ...charge sides discharge side obstacle is lower than the outdoor unit Minimum 20 Minimum 12 H Minimum 12 Minimum 79 Minimum 24 Minimum 40 Series installation PXVW EH ORZHU WKDQ I D stand is necessary it must be contained not open frame to prevent the discharge air from short cycling Where there are obstacles on both suction and discharge sides discharge side obstacle is higher than the outdoor unit ...

Page 25: ...he ambient air temperature will allow the Multi F Multi F MAX system designer to elimi nate oversizing The outdoor unit to compensate for loss of capacity at low ambient temperatures Will also curtail the need to provide inefficient redundant zone heating devices such as wall fin radiators and second stage ancillary heating devices Design Considerations Include Enclosure types and elements such as...

Page 26: ...ddition to rainwater that infiltrates the inlet louver enclosed area Install a field provided drain pan under the outdoor units and provide a path to a nearby floor drain I WKH DPELHQW DLU WHPSHUDWXUH LV H SHFWHG WR GURS EHORZ LQ WKH HQFORVXUH KHDW WKH ERWWRP VXUIDFH RI WKH SDQ GUDLQ OLQH DQG IORRU drain so that the condensate does not freeze before reaching the drain Louver Recommendations for Ou...

Page 27: ...uide Duct Louver Dimensions Air Guide Duct on Outdoor Unit Outdoor Unit Dimensions Formula Total Louver Dimension Excluding Frame A 3 9 feet x 6 2 feet 24 2 ft 2 Louver Shield Dimension by Product B 3 12 feet x 2 74 feet 8 55 ft 2 Inlet Louver Dimension A B 15 7 ft 2 Equivalent Inlet Dimension Open Rate 80 15 7 ft2 x 0 8 12 56 ft 2 Equivalent Inlet Air Volume 12 56 ft 2 x 8 2 ft s x 60 sec min 6 1...

Page 28: ...nit s refrigerant piping and wire lengths must not exceed amounts specified by LG Electronics U S A Inc Condensate drain piping is not required Ensure there is enough space in the installation area for service purposes minimum 24 inches install the refrigerant piping and electrical wiring system in an easily accessible location Level where there is enough strength to bear the weight of the branch ...

Page 29: ...pension Bolt Pitch 9 21 32 13 9 32 Indoor Unit Piping Direction Unit Inch Minimum 24 Minimum 24 Bottom View Minimum 15 3 4Mininum 15 3 4 Side View 5 29 32 2 27 32 11 13 16 2 3 8 1 3 16 1 31 32 4 3 8 A C and PMBD3640 D Connections Liquid Pipe Ø1 4 Gas Pipe Ø3 8 PMBD3641 D Connections Liquid Pipe Ø1 4 Gas Pipe Ø1 2 Notes 1 For PMBD3620 Unit Ports A and B are Available 2 For PMBD3630 Unit Ports A B a...

Page 30: ...sert Suspension Bolt Polyblock Anti Vibration Material Nail Securing Polyblock Figure 13 Close up of Bolt Attachment Outdoor Unit Platform Concrete Specifications Concrete foundations must be made of one part cement two parts sand and four parts gravel The surface of the foundation must be finished with mortar with rounded edges and weatherproofed See table and figures for height width etc require...

Page 31: ... hanging bolt as shown at right 5 Hang the branch distribution unit on the hanging bolts ceiling side up and after checking for level 5 degrees securely tighten all nuts BD unit Nu t M10 or M8 Nut M10 or M8 Flat washer Flat washer Hanging bol t Hanging bolt M10 or M8 Figure 17 Branch Distribution Ceiling Mount Installation If a screw has been installed on the frame of the branch distribution unit ...

Page 32: ...rt End Facing Right Figure 21 Unacceptable Branch Dis tribution Unit Wall Mount Orientations 1 Attach the factory supplied hangers with two 2 screws each at the designated four 4 areas on the frame of the branch distribution unit 2 Install the branch distribution unit to the wall using two screws on each of the hang ers Unit must be 5 degrees of level 3 Cover parts of the hanger holes with polyeth...

Page 33: ...irectly into CAD drawings LATS Revit integrates the LG LATS program with Revit software It permits engineers to layout and validate Multi V VRF systems directly into Revit drawings AutoCAD and Revit are both registered marks of Autodesk Inc Features All LG product design criteria have been loaded into the program making LATS simple to use double click or drag and drop the component choices Build s...

Page 34: ...e originally intended Structural elements prevent routing the piping as planned Air conditioning system conflicts with other building systems plumbing gas lines etc The contractor must mark any deviation from the design on the Shop Drawing including as built straight lines and elbows This Mark Up drawing must be returned to the design engineer or Rep who must input contractor changes into the LATS...

Page 35: ... 6 7 67 1 5 6 DEVICE CONNECTION LIMITATIONS h2 h1 A B Multi F Outdoor Unit Piping Length and Elevation Limitations One of the most critical elements of Multi F and Multi F MAX systems is the refrigerant piping See below and the following pages for pipe length limits that must be followed in the design of Multi F and Multi F MAX refrigerant pipe systems Figure 24 Multi F Refrigerant Piping System L...

Page 36: ...nected ODU Outdoor Unit IDU Indoor Unit BD Branch Distribution Unit s Ȉ 0DLQ 3LSH Ȉ UDQFK 3LSH UDQFK LVWULEXWLRQ 8QLW V WR QGRRU 8QLW V B A h2 49 2 feet A h3 32 8 feet h4 49 2 feet h1 98 4 feet BDU Y Branch BDU IDU A ODU IDU IDU IDU IDU IDU IDU B B B B B B Pipe Length ELF Equivalent Length of pipe in Feet 7RWDO SLSLQJ OHQJWK ȉ ȉ IHHW Main pipe Outdoor Unit to Branch Distribution Units ȉ Minimum 9 ...

Page 37: ... Prevent dust water or other contaminants from entering the piping during installation For Multi Zone Split Systems Use ACR copper piping rated at the system working pressure rated for R410A refrigerant Approved piping for use with LG HVAC products will be marked R410 RATED along the length of the pipe Piping wall thickness must meet local code requirements and be approved for a maximum operating ...

Page 38: ...using the following formula 1 From the table Linear Thermal Expansion of Copper Tubing in Inches find the row corresponding with the actual length of the straight pipe segment 2 Estimate the minimum and maximum temperature of the pipe Typical pipe temperature change ranges High Pressure Vapor DPELHQW WHPSHUDWXUH WR RZ 3UHVVXUH 9DSRU DPELHQW WR LTXLG SLSH DPELHQW KRRVH WKH WZR PRVW extreme In the c...

Page 39: ... 0 56 0 56 0 70 0 84 0 91 0 98 1 05 1 12 1 19 1 26 1 33 1 40 1 47 1 54 1 51 1 61 1 82 1 96 2 03 2 10 160 0 64 0 64 0 80 0 96 1 04 1 12 1 20 1 28 1 36 1 44 1 52 1 60 1 68 1 76 1 73 1 84 2 08 2 24 2 32 2 40 180 0 72 0 72 0 90 1 08 1 17 1 26 1 35 1 44 1 53 1 62 1 71 1 80 1 89 1 98 1 94 2 07 2 34 2 52 2 61 2 70 200 0 80 0 80 1 00 1 20 1 30 1 40 1 50 1 60 1 70 1 80 1 90 2 00 2 10 2 20 2 16 2 30 2 60 2 ...

Page 40: ... 66 77 86 101 115 127 138 2 R1 12 14 16 19 21 23 25 L2 77 89 99 117 133 147 160 2 1 2 R1 14 16 18 21 24 26 29 L2 86 99 111 131 149 165 179 3 R1 15 17 19 23 26 29 31 L2 94 109 122 143 163 180 196 3 1 2 R1 16 19 21 25 28 31 34 L2 102 117 131 155 176 195 212 4 R1 17 20 22 26 30 33 36 L2 109 126 140 166 188 208 226 1 R Centerline Length of Pipe 2 L Centerline Minimum Radius inches Table 18 Radii of Co...

Page 41: ...rtages Refrigerant oil degradation Poor insulation of the compressor System does not operate properly Solutions Remove moisture from the piping Piping ends should remain capped until connections are complete Do not install piping on a rainy day Connect piping properly at the unit s side Remove caps only after the piping is cut the burrs are removed and after passing the piping through the walls Ev...

Page 42: ...erify the refriger ant piping system is free of traps sagging pipes sight glasses filter driers etc Field Provided Isolation Ball Valves LG maintains a neutral position on using isolation valves in LG HVAC refrigerant piping systems LG does not endorse any manufacturer of isolation valves It is recognized that installing isolation valves will simplify future maintenance requirements and if used co...

Page 43: ...llowed by code use fiber straps or split ring hangers suspended from the ceiling on all thread rods fiber straps or split ring hangers can be used as long as they do not compress the pipe insulation Place a second layer of insulation over the pipe insulation jacket to prevent chafing and compression of the primary insulation in the confines of the support clamp A properly installed pipe system wil...

Page 44: ...ressing and lagging use a cover Sheathing Sheathing O Ring Band Lags Do not compress the insulation with the saddle type support If the insulation is compressed it will tear open and allow condensation to generate during product operation Welding Refrigerant Pipe Insulated Support Band Insulated Support Band Down Stop Welding Plate Nut Hexagonal Nut O ring Band Support at Intervals Between 5 and 6...

Page 45: ...nstalled inside underground casing must be continuous without any joints Underground refrigerant pipe must be located at a level below the frost line Figure 41 Typical Arrangement of Refrigerant Pipe and Cable s in a Utility Conduit Table 19 Utility Conduit Sizes 1 OD pipe diameter in inches Values in parenthesis indicate OD of pipe with insulation jacket 2 Diameter of pipe with insulation Thickne...

Page 46: ...ipe end Compare the geometry with the figure to the right If the flare is defective cut it off and re do procedure If flare looks good blow the pipe clean with dry nitrogen 90 45 A R 0 4 0 8 Dimensions of the Flare Pipe Size in O D A Dimension mm in 1 2 1 4 5 8 3 8 3 4 Flared Connection Dimensions Tightening Torque Handle Incorrect Flare Even Length Cracked Yoke Inside is shiny with no scratches S...

Page 47: ... braze in an enclosed location Do not allow the refrigerant to leak during brazing Always test for gas leaks before and after brazing If the refrigerant combusts it generates a toxic gas the will cause physical injury or death Braze the pipes to the service valve pipe stub of the outdoor unit 1 All joints are brazed in the field LG HVAC refrigeration system components contain very small capillary ...

Page 48: ...ction types Main gas valve Main liquid valve Gas Piping Connections Liquid Piping Connections A UNIT B UNIT C UNIT D UNIT Indoor Unit Capacity Vapor in OD Liquid in OD A B A B 18 000 Btu h Wall Mounted ĺ ĺ Ø5 8 ĺ 15 000 Btu h Console 18 000 Btu h Low Static Duct Four Way Cassette ĺ N A 24 000 Btu h ĺ N A Multi F Outdoor Unit to Indoor Unit Piping Connections Outdoor Unit Piping Connections LMU18CH...

Page 49: ...uded as a factory supplied accessory with the indoor units To install 1 Align the center of the piping sections as seen in the diagrams at right and below 2 Follow the Tightening the Flare Nuts procedure above Figure 44 Close Up of the Field Piping to the Outdoor Unit Piping Connection Figure 45 Connection Socket Diagram External View 13 0 18 0 24 6 30 4 39 8 47 7 Tightening Torque for Flare Nuts ...

Page 50: ...or unit will cause a short circuit in the electrical box which will lead to unit failure Multi F MAX Outdoor Unit System Piping Connections Outdoor Unit Piping Connections LMU480HV LMU540HV LMU600HV Liquid Line Connection in OD x Qty Ø3 8 x 1 Vapor Line Connection in OD x Qty Ø3 4 x 1 Avoid Pipe Damage When routing field provided piping avoid damaging the outdoor unit from exces sive vibration Pro...

Page 51: ...unit s refrigerant piping liquid vapor which branch distribution port it is connected to A B C D Outdoor Unit Piping Connections LMU480HV LMU540HV LMU600HV Liquid Line Connection in OD x Qty 3 8 x 1 Vapor Line Connection in OD x Qty 3 4 x 1 Avoid Pipe Damage When routing field provided piping avoid damaging the outdoor unit from excessive vibration Properly insulate the liquid and gas lines separa...

Page 52: ...OE or any other type of mineral oil as a thread lubricant These lubricants are not compatible with the PVE oil used in this system and create oil sludge leading to equipment damage and system malfunction Pipe Size in O D Tightening Torque ft lbs 1 2 1 4 5 8 3 8 3 4 Outside Diameter mm 6 35 9 52 12 7 15 88 19 05 45 4 59 3 71 5 87 5 Do not add any contaminants inside the refrigerant piping Using the...

Page 53: ... side to indoor unit Ø3 8 in Flare side to indoor unit Ø1 2 in Connection socket Flare nut Piping Ø3 8 in Ø3 8 in 3 1 2 in to 5 8 in Connection Ø5 8 in Connection socket Flare nut Piping Ø1 2 in 4 1 4 in to 3 8 Connection Flare side to indoor unit Ø3 8 in Connection socket Flare nut Piping Ø1 4 in Flare side to branch distribution unit or outdoor unit Flare side to indoor unit Flare side to branch...

Page 54: ...or unit and the two port end facing the branch distribution units Do not install Y branches backwards as refrigerant flow cannot make U turns The Y branch kit must be located at least three 3 feet from the outdoor unit Provide a min imum of 20 inches between a Y branch and the branch distribution unit When a Y branch is located in a pipe chase or other concealed space access doors must be provided...

Page 55: ... prevent water from traveling into the control box 3 If necessary secure the conduit piping set cover or bundle along the outside wall using saddles or a similar type of piping support 4 Ensure the insulated drain hose from the indoor unit is installed away from the outdoor unit and in a downwards direction If nec essary secure along the outside wall using saddles or a similar type of support 5 Se...

Page 56: ...Outdoor unit requires condensate drain piping Condensate drain pipe must be constructed with materials approved by local code See pages 22 to 24 for information in reference to outdoor unit placement and condensate drainage Drain Leak Test A leak test must be performed 24 hours after the drainage system has been installed CONDENSATE DRAIN PIPING RU LQGRRU XQLW FRQGHQVDWH GUDLQ SLSLQJ LQIRUPDWLRQ V...

Page 57: ...WHPSHUDWXUH LV RU ILHOG LQVXODWLRQ RI UHIULJHUDQW piping between outdoor units and indoor units consider the following pipe temperature ranges for an operating heat pump system HDWLQJ PRGH UHIULJHUDQW WHPSHUDWXUH UDQJHV LTXLG LJK 3UHVVXUH 9DSRU RROLQJ PRGH UHIULJHUDQW WHPSHUDWXUH UDQJHV LTXLG RZ 3UHVVXUH 9DSRU All insulation joints must be glued with no air gaps Insulation material must fit snugly...

Page 58: ...2 inch Vapor pipe ø3 8 inch 1 2 inch 3 4 inch 3 4 inch 1 inch ø1 2 inch ø5 8 inch ø3 4 inch ø7 8 inch ø1 inch ø1 1 8 inches 3 4 inch ø1 1 4 inches 1 inch 1 inch ø1 3 8 inches ø1 1 2 inches ø1 3 4 inches Table 31 Minimum Refrigerant Pipe EPDM Insulation Wall Thickness Requirements 1 1 Typical Conditioned Location EXLOGLQJ SOHQXP RU VSDFH WKDW FRQWDLQV FRQGLWLRQHG DLU WKDW GRHV QRW H FHHG 2 Special ...

Page 59: ...sible 2 Cut a piece of insulation to fit the joint overlapping the insulation on the surrounding piping by at least one 1 inch 3 Apply adhesive to bond all the ends 4 Secure by completely wrapping narrow vinyl tape around the insulation joint so that there are no gaps 5 Tape must be sufficient to cover the piping so it can fit into the rear piping housing area at the back of the indoor unit or bra...

Page 60: ...esult in electric shock physical injury or death Do not connect ground wire to refrigerant gas sewage or water piping to lightning rods to telephone ground wiring or to the building plumbing system Failure to properly provide a NEC approved earth ground can result in electric shock fire physical injury or death Consider ambient conditions temperature direct sunlight inclement weather etc when sele...

Page 61: ...rminal plate with a JIS screwdriver See information about LG terminal connec tions on the next page 2 Position the ring terminal around the terminal place the terminal screw in the ring and tighten to the terminal plate using a JIS screwdriver Firmly attach the wire secure in a way to prevent external forces from being imparted to the terminal block Use an appropriately sized JIS screwdriver for t...

Page 62: ...F MAX systems operate at 1Ø 208 230V 60Hz and power is wired to the outdoor unit only The outdoor unit will supply power to the indoor units and the branch distribution units Multi F MAX systems only through the communication con nection power cable Power supply to the outdoor unit must be selected based on NEC and local codes Maxi mum allowable voltage fluctuation 10 or nameplate rated value Powe...

Page 63: ...ndoor unit is GREATER THAN 130 feet use A two 2 conductor wire for power for each indoor unit A two 2 conductor wire for communication ground for each indoor unit Separate the power AT LEAST two 2 inches away from the communication ground wire for each indoor unit All wiring is still minimum 14 gauge stranded shielded or unshielded as cited above for each indoor unit Insulation material as require...

Page 64: ...ply 1 L1 Power L 2 L2 Neutral N G Ground Power Flow L ĺ N Diagram is an example of communication and power cables when the wiring is GREATER THAN 130 feet Terminals may be labeled differently depending on the model Outdoor and Indoor Unit appearances may vary depending on the model Communication Flow Comm ĺ N 3 Communications GREATER THAN 130 feet Must Separate Communications and Ground G Cable fr...

Page 65: ...eld supplied wiring components and materials must comply with all applicable national state and local codes and requirements Failure to install proper electrical components can result in property damage and equipment malfunction Ground wiring is required to prevent communication problems from electrical noise and motor current leakage Failure to provide proper ground wiring can result in property ...

Page 66: ...lo sion physical injury or death All field supplied wiring components and materials must comply with all applicable national state and local codes and requirements Failure to install proper electrical components can result in property damage and equipment malfunction Ground wiring is required to prevent communication problems from electrical noise and motor current leakage Failure to provide prope...

Page 67: ...eld supplied wiring components and materials must comply with all applicable national state and local codes and requirements Failure to install proper electrical components can result in property damage and equipment malfunction Ground wiring is required to prevent communication problems from electrical noise and motor current leakage Failure to provide proper ground wiring can result in property ...

Page 68: ...aterials must comply with all applicable national state and local codes and requirements Failure to install proper electrical components can result in property damage and equipment malfunction Ground wiring is required to prevent communication problems from electrical noise and motor current leakage Failure to provide proper ground wiring can result in property damage and equipment malfunction Ins...

Page 69: ...ectric shock physical injury or death Ground wiring is required to prevent accidental electrical shock during current leakage communication problems from electrical noise and motor current leakage Do not connect the ground line to the pipes There is a risk of fire electric shock explosion physical injury or death Install a main shutoff switch or circuit breaker that interrupts all power sources si...

Page 70: ...or unit is not properly grounded there is a risk of electric shock physical injury or death DLOXUH WR SURSHUO LQVWDOO ZLULQJ FDQ UHVXOW LQ HOHFWULF VKRFN UH SK VLFDO LQMXU RU GHDWK Failure to properly provide a NEC approved earth ground can result in electric shock fire physical injury or death Comply with local and national codes while running the wire from the indoor unit and branch distribution...

Page 71: ...C Room D Room A Room B Room C Room D Room BD Unit B BD Unit B 1 L1 2 L2 3 A 1 L1 2 L2 3 B L1 L2 L L1 N L2 S L L1 N L2 S 1 L1 2 L2 3 L L1 N L2 S 1 L1 2 L2 3 L L1 N L2 S 1 L1 2 L2 3 L L1 N L2 S 1 L1 2 L2 3 L L1 N L2 S 1 L1 2 L2 3 L L1 N L2 S 1 L1 2 L2 3 L L1 N L2 S 1 L1 2 L2 3 L L1 N L2 S 1 L1 2 L2 3 L L1 N L2 S Indoor Unit Terminal Block A Unit Indoor Unit Terminal Block B Unit Indoor Unit Terminal...

Page 72: ...is enough length to connect to the terminals on the branch distribution unit Secure a field supplied conduit to the branch distribution unit using a field supplied lock nut on the interior of the branch distribution unit frame Step 2 Pull the communication connection power cable through the conduit into the branch distribution unit 3 Connect communications connection power cable from the outdoor u...

Page 73: ...rmation on PI 485 installation see the PI 485 installation manual Figure 92 PI 485 Board Ap pearance will differ depending on model Figure 93 PI 485 Installation Area in Multi F and Multi F MAX Outdoor Units ELECTRICAL QVWDOODWLRQ Multi F LMU18CHV LMU24CHV Multi F LMU30CHV LMU36CHV Thi s lab el is sh o u ld b e app lied in th e lo catio n w h ere L GA P Sub PCB fo r Cen tral Co n tro ller is ins t...

Page 74: ...Some indoor units use terminal block connections other indoor units use Molex connections See diagrams below for the two options Refer to the wiring diagram schematic found in the indoor unit itself or to the indoor unit wiring diagrams in the Engineering Manuals for more information NEVER splice cut or extend LG supplied cable with field provided cable Always include enough cable to cover distanc...

Page 75: ...ne 1 group control cable kit for each indoor unit in the group except for the last indoor unit NEVER splice cut or extend cable length with field provided cable Cable connected to zone controller is the factory default connection Indoor unit connections depend on indoor unit type Figure 96 Example of Indoor Unit Group to Zone Controller Connections Sig 12V GND Comm Terminal Figure 97 Example of In...

Page 76: ...the leak test inconclusive Never perform the leak test using refrigerant To avoid nitrogen entering the refrigerant system in a liquid state the top of the cylinder must be higher than its bottom used in a vertical standing position when the system is pressurized Use only a leak free gauge manifold set Piping system must not be pressured to more than 550 psi Pressures greater than 550 psi will dam...

Page 77: ...port can used Make sure to re install the original Schrader core before operating the system Deep evacuate through both the liquid and gas vapor suction Schrader ports on the outdoor unit service ports The outdoor unit service valves must remain closed and the stem head access caps tight Do not open the outdoor unit service valves and release the factory refrigerant charge until trim charge is com...

Page 78: ...alled ball valves in the refrigerant system if used must be open to ensure all piping is free and clear for evacuation on all piping and connected indoor units branch distribution units Do not apply power to the system before performing the evacuation procedure There is a possibility that the EEV valve will close and isolate sections of the piping system making the evacuation procedure inconclusiv...

Page 79: ...QXWHV If the micron level DOES NOT stop rising there is a leak and the leak test must be performed again If the micron level DOES rise above 2 000 micron re open the manifold gauges and the vacuum pump valve and continue evacuation back down to 2 000 micron level If the micron level holds at 2 000 micron continue to step 4 4 Break vacuum with 50 psig nitrogen purge for an appropriate amount of tim...

Page 80: ...al number of connected indoor units Table 35 0XOWL 2XWGRRU 8QLW 3LSLQJ 6SHFL FDWLRQV Figure 100 Multi F Additional Refrigerant Charge Example FINAL INSTALLATION PROCEDURES Additional charge lbs Installed Length of Branch A Chargeless Pipe Length L x a Installed Length of Branch B Chargeless Pipe Length L x a Installed Length of Branch C Chargeless Pipe Length L x a Installed Length of Branch D Cha...

Page 81: ...h Piping Length Chargeless Pipe Length of Main Pipe L ft Additional Charge Needed a oz ft Chargeless Pipe Length per Branch Pipe B ft Additional Charge Needed b oz ft LMU480HV 16 4 0 54 16 4 0 22 LMU540HV 16 4 0 54 16 4 0 22 LMU600HV 16 4 0 54 16 4 0 22 Additional charge lbs Total Main Piping Length A Chargeless Pipe Length of Main Pipe L x a Installed Length of Branch B1 Chargeless Pipe Length B ...

Page 82: ...ly 5 29 ounces while the system operates in cooling This procedure must be repeated until the entire amount of refrigerant gets charged into the system perform once then wait approximately one 1 minute before resuming 5 Immediately disconnect the charge hose from the service port on the three way valve Stopping halfway allows the refrigerant to discharge If the system has been charged with liquid ...

Page 83: ...priate actions at the end of HVAC equipment life to recover recycle reclaim or destroy R410A refrigerant according to applicable US EPA rules Total System Refrigerant Charge To calculate the potential refrigerant concentration level RCL 1 Measure the occupied space dimensions in feet 2 Calculate the cubic foot volume of air in the smallest occupied space To obtain a detailed overview of the RCL pe...

Page 84: ...LWKLQ D RQH QFOXGH YHQWLODWLRQ JULOOHV LQ GRRUV LQFOXGH YHQWLODWLRQ LQOHWV RXWOHWV SDUWLWLRQV RI FXELF YROXPH RI VSDFH ZLWKLQ D RQH QFOXGH WKH DUHD DERYH WKH FHLOLQJ DV SDUW RI WKH UHWXUQ RU VXSSO DLU SDWK SDUWLWLRQV RI FXELF YROXPH RI VSDFH ZLWKLQ D RQH Install a mechanical ventilator linked to a gas leak detector Change the indoor unit type wall mounted to ceiling cassette position Figure 104 Ex...

Page 85: ...o insert the batteries follow the steps below For information on using the remote controller refer to its owner s manual 1 The remote controller needs two 2 AAA 1 5V batteries for oper ation Do not use rechargeable batteries Remove the battery cover from the back of the remote controller by pushing downward on the tab at the top of the battery cover and then lift up to remove 2 Insert the two new ...

Page 86: ...DIP Switches in Normal Operation Setting DIP Switch Setting Function Normal Operation No Function Forced Cooling Operation Wiring Error Check Reducing Power Consumption Step 1 Reducing Power Consumption Step 2 Mode Lock Cooling Mode Lock Heating Night Quiet Mode Step 1 Night Quiet Mode Step 2 Mode Lock Cooling Night Quiet Mode Step 1 Mode Lock Cooling Night Quiet Mode Step 2 Reducing Power Consump...

Page 87: ...that the Red LED on the outdoor unit PCB is ON indicates indoor units are in forced cooling operation 5 Add refrigerant If the green LED light on the outdoor unit PCB is ON it indicates the compressor is OFF due to low pressure in the system Turn DIP Switch 1 to OFF after finishing Normal Operation setting Only the first four DIP switches are functional on the LMU480 540 600HV Multi F LMU18CHV and...

Page 88: ...splayed System will operate correctly after the error is fixed If outdoor and indoor temperatures are too low ex winter the wiring error check function will not operate Red LED is ON Turn DIP Switch 2 to OFF after finishing Normal Operation setting Only the first four DIP switches are functional on the LMU480 540 600HV 3 1 2 4 3 1 2 4 3 ON OFF Figure 114 Wiring Error Check DIP Switch Setting One 1...

Page 89: ...oling operation Change the DIP switches if Night Quiet Mode is no longer desired I LQGRRU XQLW RSHUDWLRQ LV VHW E WKH IDQ VSHHG 3RZHU 1LJKW 4XLHW 0RGH ZLOO QRW IXQFWLRQ XQWLO IDQ VSHHG 3RZHU LV FKDQJHG Only the first four DIP switches are functional on the LMU480 540 600HV Figure 118 Saving Power Consumption with Mode Lock DIP Switch Settings Step 1 Reducing Saving Power Consump tion Mode Lock Coo...

Page 90: ...iagnostic Software by pushing TACT SW1 See below for the types of cycle information that will be displayed in LGMV After first page is displayed the second page will be subsequently displayed 3URWHFW QJHUV KDQGV ZLWK D QRQ FRQGXFWLQJ PDWHULDO EHIRUH SXVKLQJ TACT SW1 There is risk of physical injury or death due to electric shock TACT SW1 No of Pushes Description Display Example First Page Second P...

Page 91: ...these units Error codes are displayed on indoor unit LEDs wired remote controllers the outdoor unit PCB and through LG Monitoring View LGMV diagnos tic software Systems could generate additional codes not listed here Contact LG Support if these types of errors are seen and a simple power down and boot up has not corrected the issue Do not attempt to fix the system yourself If two or more errors oc...

Page 92: ...opped below recommended limits 3X 5X OFF 39 Communication Error between PFC MICOM and Inverter MICOM 3X 9X OFF 40 CT Sensor Error Thermistor is disconnected or has shorted out 4X OFF 41 Inverter compressor discharge pipe D Pipe sensor is disconnected or has shorted out 4X 1X OFF 43 High pressure sensor is disconnected or has shorted out 4X 3X OFF 44 Outdoor air sensor is disconnected or has shorte...

Page 93: ...n speed Actual superheat Target superheat Actual subcooler circuit superheat Target subcooler circuit superheat Main EEV position Subcooling EEV position Inverter compressor current transducer value Outdoor air temperature Actual high pressure saturation temperature Actual low pressure saturation temperature Suction temperature Inverter compressor discharge temperature Constant speed compressor di...

Page 94: ...alve Outdoor fans showing status and speeds 2 Graph Full screen graph of actual high and low pressures and high and low pressure limits A sliding bar allows viewing of previously recorded data 3 Control IDU Enables user to turn on IDU s default setpoints of LQ KHDW PRGH RU LQ FRRO PRGH 4 Setting Converts metric values to imperial values 5 Making Data Recording of real time data to a separate file ...

Page 95: ...MS 2 0 is valid for troubleshooting The free SIMS app must be correctly installed on a smart phone before using SIMS Some outdoor units have an LGMV extension cable accessed by removing the side handle cover If the outdoor unit does not have this extension cable ac cess the LGMV connector by removing the top cover of the outdoor unit High voltages capable of causing death are used in this equipmen...

Page 96: ...Air Temp Pipe in Pipe mid Pipe out Graph Info Tab This tab has three sub sections IDU Indoor Unit Temperature graph Displays IDU informa tion in graph format In formation displayed is for the IDU selected on the Main screen ODU Outdoor Unit Temperature and Fre quency graph Displays ODU information in graph format ODU Electric Out door Unit Electric data graph is displayed Outdoor Info Temperature ...

Page 97: ...IONS It is also recommended to monitor system operation using LGMV and or SIMS Software at least once a year Table 43 Maintenance Recommendations Component Maintenance Occurrence Minimum Indoor Units Wash filters On a regular basis as needed Clean coils Once a year Clean check unit base pan Once a year Outdoor Unit s Clean coils Once or twice a year Communications Cable and Power Wiring Verify tha...

Page 98: ...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...

Page 99: ... the outdoor unit to the indoor unit is minimum 14 gauge stranded shielded or unshielded If shielded must be grounded to chassis at the outdoor unit only Use a two 2 conductor wire for power use a two 2 conductor wire for communication ground Separate the power AT LEAST two 2 inches away from the communication ground wire For Multi F MAX Systems All power wiring communication cable to be minimum 1...

Page 100: ...nnovation 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 PAGE 3 Major Component Rough In Piping and Insulation Brazing Practices ...

Page 101: ...LG Electronics U S A Inc Englewood Cliffs NJ All rights reserved LG is a registered trademark of LG Corp INSTALLATION CHECKLIST PAGE 4 Installation Refrigerant Piping Installation Branch Distribution Unit Multi F MAX Systems Only QVWDOODWLRQ RQGHQVDWH 3XPS UDLQ QVWDOODWLRQ Installation Power Wire and Communications Cables ...

Page 102: ... Length L x a Installed Length of Branch D Chargeless Pipe Length L x a CF Correction Factor x 5 29 Multi F Outdoor Unit Model Min to Max Piping Length for One Branch ft Max Total System Piping Length ft Chargeless Pipe Length per Branch L ft Additional Charge Needed a oz ft LMU18CHV 10 to 82 164 24 6 0 22 LMU24CHV 10 to 82 246 1 24 6 0 22 LMU30CHV 10 to 82 246 1 24 6 0 22 LMU36CHV 10 to 82 246 1 ...

Page 103: ...anches depends on system specifications CF Maximum number of connectible indoor units Total number of connected indoor units MULTI F MAX REFRIGERANT CHARGE WORKSHEET LG Multi F MAX outdoor units ship from the factory with a charge of R410A refrig erant A trim charge will need to be added to take into account additional piping length To determine the additional refrigerant that is needed apply the ...

Page 104: ...CS INC LG Electronics U S A Inc Air Conditioning Technologies 4300 North Point Parkway Alpharetta Georgia 30022 www lghvac com IM_MultiF_ODU_04_20 Supersedes IM_MultiF_ODU_03_17 IM_MultiF_ODU_11_16 IM_MultiF_ODU_4_16 IM_MultiF_ODU_11_15 ...

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