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System Engineering

52

  

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SYSTEM ENGINEERING

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.

 EQUIPMENT SELECTION PROCEDURE

ARUN 036, 047, 053

Note:  

Avoid over-sizing indoor units in an attempt to 

increase the room air recirculation rate.  VRF systems are 
designed for minimum airflow over the coil to maximize 
latent capacity while cooling, maintain a comfortable, 
consistent discharge air temperature while heating, and 
minimize fan motor power consumption. 

To properly size indoor unit(s), begin by referring to the output report 
provided by LG’s LATS Multi V software and note the appropriate 
corrected cooling and heating capacity for each indoor unit for the 
cooling and heating design days.
In LATS, the corrected cooling capacity is different from the 

nominal

 cooling capacity because the corrected capacity includes 

changes in unit performance after considering refrigerant line pres-
sure drop, the system's Combination Ratio (CR), and the effect 
design ambient operating conditions has on the indoor unit's cooling 
capability.
The building sensible cooling load is typically the critical load to 
satisfy.  In coastal areas or humid applications, such as high occu-
pancy spaces, both the latent and sensible cooling loads should be 
considered.  In areas where the cooling and heating loads are similar 
or the heating load may exceed the total cooling load, the designer 
should verify the indoor unit selection satisfies both the heating and 
cooling requirements.

Check the indoor unit's cooling capacity.  If the system is installed 
at a significant elevation above sea level, it may be appropriate to 
adjust the cooling capacity for changes in air density.  Apply the 
appropriate altitude correction factor for the building’s location to the 
outdoor and indoor units. 
After applying the factor, verify the sensible (and total) corrected 
cooling capacity for each indoor unit is at least equal to the sum of 
the appropriate cooling design day space load(s) (plus ventilation 
load(s) if applicable) for the space(s) served by the indoor unit.  
Next, check the indoor unit heating capacity.  Begin by finding the 
corrected heating capacity detailed in the LATS report for each in-
door unit.  The corrected heating capacity is again different from the 

nominal

 heating capacity because the corrected capacity includes 

changes in unit performance after considering refrigerant line pres-
sure drop and design ambient operating conditions on the indoor 
unit's heating capability.

  

If the system is installed at a significant 

elevation above sea level, adjust the heating capacity for changes 
in air density. Apply the appropriate altitude correction factor for the 
building’s location.  Multiply the corrected heating capacity detailed 
in the LATS report for each indoor unit by the altitude correction fac-
tor selected.   
Verify that the actual corrected heating capacity for each indoor unit 
is at least equal to the sum of the appropriate heating design day 
building load (plus the ventilation loads if applicable) for all spaces 
served by the indoor unit.

 Select the Outdoor Unit

Table 18:

 Cataloged Ambient Air Operating Temperature Range

Cooling Mode (°F DB)

Heating Mode (°F WB)

Multi V Mini

23 – 115

(-4) – 60

Note:  

Multi V Mini outdoor unit(s) may have to operate in 

weather conditions more extreme than a typical design day.  
Design days are the days of the year that either cooling or 
heating capacity is needed the most.  In light of this, it may 
be prudent to size the outdoor unit considering the antici-
pated worst weather day conditions to ensure adequate 
capacity year round.

Begin the selection of the outdoor unit by selecting a size that meets 
the cooling capacity requirement.  Then verify the selected unit 
meets the heating capacity requirement.  Find the appropriate capac-
ity table on pages 26–39 for the outdoor unit chosen.  Locate the 
outdoor unit cooling and heating capacity values at the specified 
ambient design conditions.
When design outdoor ambient conditions are outside the cataloged 
air-cooled outdoor unit operating range, the net refrigeration effect 
(capacity) delivered to the indoor units cannot be guaranteed.  Under 
these conditions, the possibility exists that the liquid injection valve 
or hot gas bypass valve in the outdoor unit may be open.  When 
open, the outdoor unit will sacrifice capacity to maintain operational 
stability.  As a result, the outdoor unit’s net refrigeration effect avail-
able for use by the indoor units will be slightly reduced under certain 
extreme ambient air conditions.
Additionally, when the designer provides the LATS software with 
outdoor ambient air design conditions that are above or below the 
cataloged operational temperature range, the software will override 
the designers specified conditions and size the indoor and outdoor 
units and pipe system using the maximum or minimum cataloged 
ambient air operating temperature.  
Also, it is important to know that the report generated by LATS (.xls 
format) will reflect the outdoor ambient air conditions the designer 
provides, but the indoor and outdoor unit(s) cooling and heating cor-
rected capacities calculated and shown in the report will be based on 
the cataloged ambient air operating temperature limits of -4°F for the 
heating design day and 115°F for the cooling design day.  On these 
projects, the designer must manually estimate the corrected cooling 
and heating capacity of the outdoor unit when specified ambient 
conditions are outside the cataloged range.

Note:  

To roughly estimate outdoor unit capacity at condi-

tions outside the cataloged ambient air operating tempera-

ture range, manually extrapolate performance informa-

tion provided in the appropriate outdoor unit engineering 

manual.

In lieu of designing for extreme weather conditions beyond the 
cataloged temperature range, consider limiting the maximum and/
or minimum temperature of the air around the Multi V Mini outdoor 

Summary of Contents for Multi V mini

Page 1: ...Engineering Manual Variable Refrigerant Flow Air Cooled 3 0 4 4 Tons Air Source Heat Pump VRF System Condensing Unit ...

Page 2: ...elopment LG reserves the right to change specifications without notice LG Electronics U S A Inc PROPRIETARY DATA NOTICE This document as well as all reports illustrations data information and other materials is the property of LG Electronics U S A Inc ...

Page 3: ... installation and commissioning LG offers a variety of classes designed for engineers architects installers and servicers to ensure that every Multi V installation is completed successfully Classes are conducted at LG s training centers and in field locations at various times throughout the year and upon special request Variable Refrigerant Flow VRF Technology In the early 1980s VRF technology was...

Page 4: ...cementConsiderations 57 ClearanceRequirements 59 LATSMultiVPipeSystemDesignTool 61 PipeDesignParameters 62 PipeLayoutProcedure 63 PipingDesignGuide 66 JobsiteConnections 77 MiniRefrigerantCharge 79 CUTSHEETS 81 DimensionalDataandWeights 82 PipeandElectricalConnections 83 Y BranchKits 84 HeaderKits 85 U S DESIGNSTANDARDS 87 ASHRAEStandardsSummary 88 ASHRAEStandard15 2004andASHRAEStandard34 2007 88 ...

Page 5: ...INTRODUCTION Architectural Appeal on page Architectural Appeal on page 8 8 Engineers Advantage on page Engineers Advantage on page 9 9 ...

Page 6: ...ing types and sizes such as schools hotels hospitals offices and residences The light weight and small footprint allows the system components to be placed in the building without expensive cranes easily fitting into most service elevators and set in place with minimal requirements for structural reinforcements The system s modular design means Multi V can be commissioned in stages so tenants can m...

Page 7: ...import AutoCAD drawings and lay out the Multi V system to scale When the designer finishes the AutoCAD system layout all of the piping lengths will be calculated and a drawing file with the Multi V system will be available for export and integration into the building drawing set Energy Modeling LG stands behind efficiency and performance You will find Multi V in the EnergyPro building energy simul...

Page 8: ......

Page 9: ...PRODUCT DATA Product Features and Benefits on page Product Features and Benefits on page 12 12 Unit Nomenclature on page Unit Nomenclature on page 13 13 General Data on page General Data on page 14 14 ...

Page 10: ...ith aluminum fins designed to maximize unit operating ef ficiency over a wide range of ambient conditions GoldFin Coating Standard from the factory every LG Multi V outdoor coil fin surface is coated with LG s exclu sive GoldFin anti corrosive protective coating designed to prevent natural surface corrosion of the aluminum fins This maintains heat transfer properties of the coil for an extended ti...

Page 11: ... Unit Refrigerant R410A ly Multi V Indoor Unit pe DC Inverter Heat Pump y h s 0Hz 1Ph 2 Model B1 Ducted low static convertible B2 Ducted low static convertible B3 Ducted low static bottom return B4 Ducted low static bottom return BG Ducted high static BH Ducted high static BR Ducted high static CE Floor Standing CF Floor Standing S5 Wall Mounted NJ Vertical Horizontal NK Vertical Horizontal SE Wal...

Page 12: ...0 166 2 0 166 Qty Diameter in 2 20 75 2 20 75 2 20 75 Motor Drive Brushless Digitally Controlled Direct Brushless Digitally Controlled Direct Brushless Digitally Controlled Direct Operating Range RPM 80 950 80 950 80 950 Maximum Air Volume CFM 3 885 3 885 3 885 Maximum External Static Pressure in wg 0 16 0 16 0 16 Airflow Direction Horizontal Back to Front Horizontal Back to Front Horizontal Back ...

Page 13: ...ge lbs of R410A 6 6 6 6 6 6 Acoustic Data Table 2 Electrical Characteristics Outdoor Unit 60 Cycle Compressor and Fan Motors Nom Tons Unit Model No Unit Operating Voltage Range MCA MOP Compressor Motor Fan Motor s No Volts Phase Amps No Volts Phase Amps RLA ea FLA ea kW 3 0 ARUN036GS2 187 253 29 0 50 1 208 230 1 21 5 2 208 230 1 1 0 35 4 0 ARUN047GS2 187 253 33 0 55 1 208 230 1 24 8 2 208 230 1 1 ...

Page 14: ...d Center Frequency Hz Octave Band Center Frequency Hz Octave Band Sound Pressure Level dB re 20µPa Octave Band Sound Pressure Level dB re 20µPa 10 20 30 40 50 60 70 80 63 125 250 500 1000 2000 4000 8000 NC 15 NC 20 NC 25 NC 30 NC 35 NC 40 NC 45 NC 50 NC 55 NC 60 NC 65 Approximate Hearing Threshold z H y c n e u q e r F r e t n e C d n a B e v a t c O z H y c n e u q e r F r e t n e C d n a B e v a...

Page 15: ... 600 15 SE 15 400 17 100 18 S5 19 100 21 500 24 S5 24 200 27 300 Ceiling Cassette 1 Way 07 TJ 7 500 8 500 09 TJ 9 600 10 900 12 TJ 12 300 13 600 Ceiling Cassette 2 Way 18 TL 19 100 21 500 24 TL 24 200 27 300 Ceiling Cassette 4 Way 05 TR 5 500 6 100 07 TR 7 500 8 500 09 TN 9 600 10 900 09 TR 9 600 10 900 12 TN 12 300 13 600 12 TR 12 300 13 600 15 TN 15 400 17 100 15 TQ 15 400 17 100 18 TM 19 100 21...

Page 16: ...09 B1 9 600 10 900 12 B1 12 300 13 600 15 B1 15 400 17 100 18 B2 19 100 21 500 24 B2 24 200 27 300 Ducted Low Static Slim Bottom Return 07 B3 7 500 8 500 09 B3 9 600 10 900 12 B3 12 300 13 600 15 B3 15 400 17 100 18 B4 19 100 21 500 24 B4 24 200 27 300 Vertical Air Handler 12 NJ 12 000 13 500 18 NJ 18 000 20 000 24 NJ 24 000 27 000 30 NJ 30 000 34 000 36 NJ 36 000 40 000 42 NK 42 000 46 000 48 NK ...

Page 17: ... VJ 19 100 21 500 24 VJ 24 200 27 300 Convertible Surface Mount 09 VE 9 600 10 900 12 VE 12 300 13 600 Floor Standing with Case 07 CE 7 500 8 500 09 CE 9 600 10 900 12 CE 12 300 13 600 15 CE 15 400 17 100 18 CF 19 100 21 500 24 CF 24 200 27 300 Floor Standing without case 07 CE 7 500 8 500 09 CE 9 600 10 900 12 CE 12 300 13 600 15 CE 15 400 17 100 18 CF 19 100 21 500 24 CF 24 200 27 300 GENERAL DA...

Page 18: ...d and unoccupied temperature setpoints fan speed and airflow direction for up to 16 indoor units Programmable schedule with 5 events per day with control of occupied unoccupied on off mode setpoints and fan speed Advanced functions include two setpoint autochangoever minimum difference between setpoints setback and timed override Wireless Handheld PQWRHDF0 Ivory Allows control of indoor unit on of...

Page 19: ...Speed Run Status Error Status Enables the indoor unit to be controlled and monitored by a third party thermostat or controller Digital Output DO Kit PQNFP00T0 Comm Bus On Off 0 1 One 25 amp DPST normally open relay Used with central controller to control third party device manually or by schedule Auxiliary Heater Relay Kit PRARH0 Indoor Unit 3rd party supplemental heat control 0 1 Adds coordinated...

Page 20: ...refer to Table 11 Indoor Unit Controls and Options Before specifying or placing an order refer to the V Net Network Solution Engineering Product Data Book and review the detailed technical data provided to fully understand the capabilities and limitations of these devices For information on controller compatibility refer to Table 11 Indoor Unit Controls and Options Central Controller Name Model No...

Page 21: ...T ENGINEERING 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 GENERAL DATA ...

Page 22: ... louver Jet cool power cooling Operation E S P control High ceiling Auto restart after power restore Hot Start Diagnostics Soft Dry dehumidification Auto changeover1 5 Auto operation Auto clean coil dry Child lock Forced operation Group control Requires the use of one Group Control Cable Kit PZCWRCG3 for every ad ditional indoor unit Sleep mode Timer on off Weekly schedule Two thermistor control T...

Page 23: ...E DATA Performance Data on page Performance Data on page 26 26 Unit Refrigerant Flow Diagrams on page Unit Refrigerant Flow Diagrams on page 44 44 Outdoor Wiring Diagram on page Outdoor Wiring Diagram on page 46 ...

Page 24: ...85 45 3 2 87 46 2 2 89 47 0 2 91 85 30 1 1 87 36 7 2 48 41 6 2 99 42 9 3 11 44 1 3 13 44 5 3 15 45 8 3 18 90 30 1 2 01 36 7 2 66 41 2 3 21 42 5 3 24 43 3 3 27 44 1 3 29 44 9 3 31 95 30 1 2 15 36 7 2 86 40 8 3 34 41 2 3 37 42 5 3 40 43 3 3 42 44 1 3 45 100 30 1 2 30 36 7 3 06 40 0 3 48 40 8 3 50 42 0 3 54 42 5 3 55 43 3 3 58 105 28 9 2 53 34 2 3 37 36 7 3 68 38 8 4 05 39 6 4 21 40 8 4 28 41 6 4 35 ...

Page 25: ...9 1 70 34 4 1 99 38 5 2 30 40 9 2 52 44 0 2 84 85 22 7 1 28 27 5 1 65 30 9 1 96 34 4 2 30 38 5 2 66 40 9 2 92 42 6 3 10 90 22 7 1 37 27 5 1 77 30 9 2 10 34 4 2 47 38 5 2 86 40 9 3 14 41 9 3 23 95 22 7 1 46 27 5 1 89 30 9 2 25 34 4 2 65 38 5 3 07 40 6 3 34 41 3 3 36 100 22 7 1 56 27 5 2 02 30 9 2 41 34 4 2 84 38 5 3 25 39 9 3 47 40 6 3 49 105 22 7 1 70 27 5 2 20 30 6 2 62 34 0 3 07 37 8 3 54 38 5 3...

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Page 41: ...7 40 0 36 0 44 7 4 00 42 4 3 77 40 3 3 54 38 4 3 33 36 6 3 29 35 6 3 10 33 7 2 87 32 0 2 67 45 0 41 0 44 7 3 87 42 4 3 64 40 3 3 41 38 4 3 26 36 6 3 23 35 6 2 96 33 7 2 78 32 0 2 60 47 0 43 0 44 7 3 76 42 4 3 51 40 3 3 29 38 4 3 06 36 6 3 20 35 6 2 87 33 7 2 68 32 0 2 50 50 0 46 0 44 7 3 59 42 4 3 38 40 3 3 20 38 4 3 00 36 6 2 90 35 6 2 82 33 7 2 62 32 0 2 44 55 0 51 0 44 7 3 49 42 4 3 29 40 3 3 1...

Page 42: ... Airflow Airflow Airflow Coil High Pressure Sensor Y Branch Pressure Switch Low Pressure Sensor Strainer Temperature Sensor Electronic Expansion Valve EEV 4 Way Valve Field Piping Connection Flow Regulator Service Valve Solenoid Bypass Valve Solenoid Hot Gas Valve Low Temp Low Pressure Vapor High Temp High Pressure Liquid High Temp High Pressure Vapor T1 Space Temperature Sensor T2 IDU Refrigerant...

Page 43: ...lve Solenoid Bypass Valve Solenoid Hot Gas Valve Low Temp Low Pressure Vapor High Temp High Pressure Liquid High Temp High Pressure Vapor T1 Space Temperature Sensor T2 IDU Refrigerant Entering Temperature Sensor T3 IDU Refrigerant Leaving Temperature Sensor T4 Outdoor Ambient Temperature Sensor T5 Coil Pipe Temperature Sensor T6 Suction Temperature Sensor T7 Compressor Discharge Temperature Senso...

Page 44: ...er to inverter CN LGMV Connection for LGMV service tool CN MAIN Communication with main microprocessor CN MOTOR1 Communication power connection for motor1 CN MOTOR2 Communication power connection for motor2 CN POWER AC power from noise filter CN UVW Power to Inverter Compressor SW01S Control system reset button SW02V Auto Address button SW01V DATACONFIRM Line power connection 208 230 60 1 Neutral ...

Page 45: ...page Clearance Requirements on page 59 59 LATS Multi V Pipe System Design Tool on page LATS Multi V Pipe System Design Tool on page 61 61 Pipe Design Parameters on page Pipe Design Parameters on page 62 62 Pipe Layout Procedure on page Pipe Layout Procedure on page 63 63 Piping Design Guide on page Piping Design Guide on page 66 66 Jobsite Connections on page 77 Jobsite Connections on page 77 Mini...

Page 46: ...city by John Murphy published in the ASHRAE Journal April 2010 Method 1 Decoupled Dedicated Outdoor Air DDOAS Provide a separate dedicated outdoor air system designed to filter condition and dehumidify ventilation air and deliver it directly to the condi tioned space through a separate register or grille This approach requires a separate independent ventilation duct system not associated with the ...

Page 47: ...par ticulate on the filter media being blown back into the conditioned space Advantages May require less ductwork if indoor units are placed near outdoor walls or roof deck Controls must be interlocked to shut off the outdoor air supply fan when the space is unoccupied Third party demand control ven tilation controls may be installed in order to regulate outdoor intake based on the CO2 levels of t...

Page 48: ... used with a full lineup of Multi V indoor units Disadvantages In some locations of the country it may be difficult to control humidity levels while outdoor air louvers hoods are opened Thermal comfort levels may be substandard when louvers hoods are opened Indoor units may have to be oversized to account for the added heating cooling loads when louvers hoods are open Hot cold and or humid areas m...

Page 49: ...wever there are product limitations and additional considerations that may need to be understood when using direct connection accessories For more information contact your LG applied equipment representative Go to www LG VRF com to find your representative and technical product information Note In all cases LG recommends ducting pretreated room neutral ventilation air directly to the space When pr...

Page 50: ... by the altitude correction fac tor selected Verify that the actual corrected heating capacity for each indoor unit is at least equal to the sum of the appropriate heating design day building load plus the ventilation loads if applicable for all spaces served by the indoor unit Select the Outdoor Unit Table 18 Cataloged Ambient Air Operating Temperature Range CoolingMode FDB HeatingMode FWB Multi ...

Page 51: ...rify the actual cooling capacity is at least equal to the total building load considering building diversity if applicable Next determine the outdoor unit s actual corrected heating capacity Two correction factors may apply one for operating the outdoor unit with frost on the coil and one for altitude above sea level The im pact of frost accumulation on the outdoor unit coil can be calculated by L...

Page 52: ...m is used to generate a graphical representation of the evaporator performance at indoor design conditions To generate the graph the physical characteristics of the evaporator coil design are entered into the selection program and frozen The designer will typically run the pro gram a minimum of three times each time making a selection with a different specified evaporator coil capacity One selecti...

Page 53: ...g as the designer 1 Knows the indoor unit s is oversized relative to the actual load s in the spaces served 2 Knows the space loads will peak at different times of the day i e building has load diversity In some designs over sized indoor units may be unavoidable in cases where the smallest size indoor unit available from LG is larger than what is necessary to satisfy the space load This scenario m...

Page 54: ...1 0 At 85 outdoor air relative humidity The frost accumulation factor does not account for effects of snow accumulation restricting airflow through the outdoor unit coil Table 20 Outdoor Unit Cooling Correction Factor Outdoor Unit above Indoor Units Equivalent Pipe Length in Feet ELF Elevation Differences ft 25 33 66 98 131 164 197 230 263 295 328 361 0 1 00 0 99 0 97 0 95 0 93 0 91 0 9 0 87 0 88 ...

Page 55: ...Clearances Plan View 1 Figure 11 Outdoor Unit Mounting and Service Clearances Elevation View Figure 13 Mounting Method 22 Note 1 Minimum airflow clearance specifications are based on a single unit installation without obstructions Refer to Clear ance Requirements on page 59 for specific airflow clearance requirements when obstructions are present 2 All referenced materials are to be field supplied...

Page 56: ...ed by electromagnetic waves which may result in abnormal system operation Also the inverter compo nents in these units may generate electromagnetic noise Therefore ensure that there is enough distance between the outdoor unit and any computer stereo and other electronic equipment In weak elec trical wave areas ensure there is at least 9 8 feet between indoor unit remote controllers and other elect...

Page 57: ... Figure 18 Single Unit high rear wall and low front wall with no side walls CLEARANCE REQUIREMENTS Figure 21 Side by Side high rear and side walls Outdoor Unit Minimum Clearance Figure 24 Single Unit high rear wall and low front wall with building overhang and no side walls Legend LR Rear wall height LF Front wall height H Unit height Legend LR Rear wall height LF Front wall height H Unit height F...

Page 58: ...w front wall with no side walls or overhang Max20 Min 40 Min4 Min40 Min40 Min12 Airflow 1000 39 1 4 or more 100 3 15 16 or more 1000 39 1 4 or more 500 19 5 8 orless Airflow Airflow Airflow Airflow 1000 39 1 4 or more 100 3 15 16 or more 1000 39 1 4 or more 500 19 5 8 orless Airflow Airflow H L 300 11 7 8 ormore 500 19 5 8 orless 1000 39 1 4 or more H L 1500 59 ormore 100 3 15 16 ormore When insta...

Page 59: ... of a plan view drawing dwg format for each floor of the structure into LATS Multi V Select and place system components on the floor plan drawing s and draft interconnecting pipe between system components and riser pipe segments between floors Once the layout is complete use the export feature to create a file dxf for mat that can subsequently be imported into the building design drawings Note On ...

Page 60: ...id and vapor Table 23 Field Supplied Refrigerant Fittings Liquid Line Equivalent Pipe Length Copper Tubing Size OD Equivalent Pipe Length 3 8 1 2 5 8 3 4 7 8 1 1 8 Standard 90O Elbow 0 6 0 9 1 3 1 6 1 9 2 5 Long Radius 90O Elbow 0 4 0 6 0 8 1 0 1 3 1 7 Street 90O Elbow 1 0 1 6 2 1 2 6 3 1 4 2 Standard 45O Elbow 0 3 0 5 0 7 0 8 1 0 1 3 Street 45O Elbow 0 5 0 8 1 1 1 4 1 6 2 2 Y Branch 1 6 1 6 1 6 1...

Page 61: ... from the Equipment Selection Procedure on page 51 list the nominal cooling capacity next to each indoor unit on the drawing 6 Starting at the runout segment servicing the indoor unit located farthest from the outdoor unit note the connected nominal capacity of the indoor unit served by the pipe segment Record these values next to each segment on the drawing 7 At the branch or pipe segment upstrea...

Page 62: ...9 MBh downstream capacity Liquid Vapor Liquid Vapor Liquid Vapor Liquid Vapor Liquid Vapor ARUN036GS2 3 8 5 8 3 8 3 4 1 4 1 2 3 8 5 8 ARUN047GS2 3 8 5 8 3 8 3 4 1 4 1 2 3 8 5 8 ARUN053GS2 3 8 3 4 3 8 3 4 3 8 3 4 3 8 3 4 3 8 3 4 1 Select the equivalent length of the longest pipe run between the outdoor unit and the furthest indoor unit 2 Capacity MBh The sum of the nominal capacity of all connected...

Page 63: ...d Floor Mount 4 Way Cassette Cooling 7 5 MBh Heating 8 5 MBh ARNU073CEA2 Cased Floor Mount 4 Way Cassette Cooling 7 5 MBh Heating 8 5 MBh ARNU073B1G2 Recessed Ceiling Low Static Discharge Cooling 7 5 MBh Heating 8 5 MBh ARNU073TEC2 Recessed Ceiling 4 Way Cassette Cooling 7 5 MBh Heating 8 5 MBh ARNU073SEL2 High Wall Surface Mount Cooling 7 5 MBh Heating 8 5 MBh Multi V Mini ARUN047GS2 Cooling 47 8...

Page 64: ...i V systems The only field provided fittings allowed in a Multi V piping system are 45 and 90 elbows and full port ball valves There is no limitation on the number of Y Branches that can be installed but there is a limita tion on the number of indoor units connected to a single outdoor unit See Table 1a on page 14 Avoid installing Y Branches back wards as shown in Figure 36 Re frigerant flow canno...

Page 65: ...eld supplied insulation Field supplied copper pipe Header kits are intended for use where multiple indoor units are in close proxim ity to each other or where it would be more economical to home run the run out pipe segments back to a centralized location If connecting multiple indoor units that are far apart Y Branches may be more economical See Tables 38 and 39 on page 4 for Header kit specifica...

Page 66: ...limitations listed on page 55 Using Elbows Third party elbows are allowed as long as they are designed for use with R410A refrigerant The designer and installer should use a minimum number of fittings since they must consider the pressure drop each creates measured in equivalent length of pipe in feet When using the LATS Multi V software or when performing manual calculations the additional equiva...

Page 67: ...ure of the R410A refrigerant at the highest operating condition Source The Copper Tube Handbook 2010 Copper Development Association Inc 260 Madison Avenue New York NY 10016 PIPING DESIGN GUIDE Type Seamless Phosphorous Deoxidized Class UNS C12200 DHP Straight Lengths H58 Temper Coils O60 Temper Selecting Copper Tubing Copper is the only approved refrigerant pipe material for use with LG Multi V co...

Page 68: ...al fixed point of the pipe segment is typically where the expansion Loop or U bend should be placed Linear pipe expansion can be calculated using the following formula Refer to Table 28 and 29 for anticipated expansion distances for copper pipe 1 From Table 28 find the row corresponding with the actual length of the straight pipe segment 2 Estimate the minimum and maximum temperature of the pipe 3...

Page 69: ...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 80 2 90 3 00 220 0 88 0 88 1 10 1 32 1 43 1 54 1 65 1 76 1 87 1 98 2 09 2 20 2 31 2 42 2 38 2 53 2 86 3 08 3 19 3 30 240 0 96 0 96 1 20 1 44 1 56 1 68 1 80 1 92 2 04 2 16 2 28 2 40 2 52 2...

Page 70: ... 13 15 17 18 L2 54 63 70 83 94 104 113 1 1 2 R1 11 12 14 16 18 20 22 L2 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 R Centerline Min...

Page 71: ... and compression of the primary insulation within the confines of the support pipe clamp Pipe and insulation should be allowed to move linearly as pipe temperature changes Straight segments up to 3 4 inch OD should be supported at least every 5 feet or per local codes if more stringent Straight segments of 1 inch OD and larger copper pipe should be supported every 6 feet or per local codes if more...

Page 72: ...s See Figure 49 and Figure 50 When placing multiple outdoor units in the same vicinity a multiple tier pipe cable tray similar to the one shown in Figure 50 may be a good option Position refrigerant pipe power cables and communication cables so they do not impede walking access to the unit or the removal of service access panels Best practice dictates that insulated piping and cables should be pro...

Page 73: ...valves oil separators and heat exchangers that can easily become blocked if debris such as copper burrs slag and carbon dust is introduced to the pipe system during installation Keep the piping system free of contaminants Filter dryers cannot be used a Store pipe stock in a dry place b Keep stored pipe capped and clean c Blow all pipe sections clean with dry nitrogen prior to assembly d De bur and...

Page 74: ...rect sun light and or deterioration producing elements should be covered with a PVC or aluminum vapor barrier jacket or alternatively placed in a weather resistant enclosure such as a pipe rack with a top cover See Figures 49 and 50 on page 74 The design engineer should perform calculations to determine if the factory supplied insulation jackets have sufficient thickness to meet local codes and av...

Page 75: ... 2 on page 15 for full load ampere ratings Size all wiring and field provided components per local codes Power Wiring Route control wiring and power wir ing in separate conduits All wiring must conform to NEC and local codes Unit disconnect and wiring is field supplied Communication Cables See Figure 55 Figure 56 and Figure 57 See page 74 for all low voltage wiring termination details Lightning Pr...

Page 76: ...minal Terminal A on the indoor units may be tagged 3 A or 5 A G Connect outdoor unit terminal IDU B to in door unit terminal B Terminal B on the indoor units may be tagged 3 B or 5 B H Maximum allowed length of indoor unit com munication cable is 984 feet 1 2 3 4 5 6 7 8 9 10 GND DRY 2 DRY 1 Internet A Internet B IDU A IDU B SODU A SODU B Fan Only Cool Heat Selector Switch or customer supplied sys...

Page 77: ...drawing of the system s liquid line or mark up a tree mode piping diagram from LATS Multi V Document the linear feet of straight pipe and the quantity and type of each fitting by pipe diameter 3 Calculate the total linear feet of liquid line tubing in the system Record the values using lines 1 3 in Table 30 4 Count the number of indoor units Group them by model type and nominal capacity 5 Group in...

Page 78: ...N 9k to 15k 1 06 12 4 Way Large Cassette TM 18k to 24k 1 41 13 4 Way Large Cassette TP 24k to 28k 1 06 14 4 Way Large Cassette TN 36k 1 41 15 4 Way Large Cassette TM 42k to 48k 1 41 16 High Static Ducted BH 7k to 24k 0 57 17 High Static Ducted BG 15k to 42k 0 97 18 High Static Ducted BR 48k 1 37 19 Low Static Ducted B1 B3 7k to 15k 0 37 20 Low Static Ducted B2 B4 18k to 24k 0 82 21 Vertical Air Ha...

Page 79: ...Weights on page Dimensional Data and Weights on page 82 82 Pipe and Electrical Connections on page Pipe and Electrical Connections on page 83 83 Y Branch Kits on page Y Branch Kits on page 84 Header Kits on page Header Kits on page 85 ...

Page 80: ...3 31 ARUN053GS2 234 258 87 33 83 31 Image not to scale All dimensions 0 25 inches Consult NEC for required electrical clearances Figure 63 depicts the minimum airflow clearance data provided is for a single unit installation placed in an open area without overhangs or near other heat rejecting equipment Refer to Placement Considerations on page 57 or Clearance Re quirements on page 59 for minimum ...

Page 81: ...ut 3 4 x5 Cutout Bundled pipe connection Power and communications wiring Keep pests out Fill area around pipe bundle with spray foam and suitable weather tight cover Gasket rough metal edges to protect pipe and wire chaffing 4 4 x2 Cutout CUT SHEET Figure 64 036 047 053 Piping Options Front Side Connections Figure 65 036 047 053 Piping Options Rear Connections Model Liquid Vapor Conn Type Conn Typ...

Page 82: ...st be kept free of debris and dry before installation ID Internal Diameter OD Outside Diameter All dimensions in inches Tolerance 0 25 inch Images are not to scale Must follow installation instructions in the ap plicable LG installation manual 11 10 Figure 74 Y Branch connection dimensions Table 36 Fitting Properties Material Copper Design Pressure 551 psig Insulation Jacket Properties Material Po...

Page 83: ...id 3 8 1 2 3 8 1 4 1 2 5 8 Vapor 5 8 3 4 5 8 1 2 1 2 5 8 ARBL104 Liquid 3 8 1 2 3 8 1 4 1 4 3 8 Vapor 7 8 1 1 1 8 3 4 5 8 1 2 5 8 ARBL107 Liquid 3 8 1 2 3 8 1 4 1 4 3 8 Vapor 7 8 1 1 1 8 3 4 5 8 1 2 5 8 A Header is a pipe that serves as a central connection for multiple runout pipe segments terminating at indoor units All dimensions in inches Internal Diameter Toler ance 0 25 inch Shipped with plu...

Page 84: ...EET 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 ...

Page 85: ...U S DESIGN STANDARDS ASHRAE Standards Summary on page ASHRAE Standards Summary on page 88 88 Building Sustainability on page Building Sustainability on page 92 92 ...

Page 86: ...frigeration and Air Conditioning Engineers Inc ASHRAE Standard 15 2007 Atlanta GA ASHRAE Inc Section 7 3 The displacement of oxygen in an occupied space could lead to occupant asphyxiation in the event of a catastrophic release of the entire system s refrigerant charge The standard allows a Refrigerant Concentration Limit RCL of 0 025 lbs ft3 for R410A in most applications refer to the standard fo...

Page 87: ...alculating the refrigerant quantity limit in the system ASHRAE STANDARDS SUMMARY Calculate the volume of air in each occupied space using the following guidelines to determine the dimensions of each space ASHRAE Standard 15 2004 and ASHRAE Standard 34 2007 Follow these steps to calculate the potential refrigerant concentration level 1 Measure the occupied space dimensions in feet 2 Calculate the c...

Page 88: ... performance based design approach where the indoor air quality in the occupied areas is actively monitored using sensing devices When the IAQ falls below specified levels the volume of outside air introduced into the building is modified There are three methods used for ventilating buildings 1 Mechanical active ventilation 2 Natural passive ventilation 3 Mixed mode active and passive ventilation ...

Page 89: ...o in the event the ventilation air is outside the indoor unit design parameters and the return and ventilation air streams fail to mix properly before entering the indoor unit coil air stratification may occur causing er ratic behavior of the Multi V indoor unit Operationally the designer must consider many what if failure scenarios and understand the impact on building HVAC system operations Nega...

Page 90: ... all encom passing balanced approach for developing sustainable green buildings References USGBC 2009 Green Building Design Construction Washington DC USGBC Staff Page 535 LEED is a registered trademark of the U S Green Building Council 1 LEED Reference Guide for Green Building Design and Construction 2009 Edition 2 LEED Reference Guide for Green Building Operations and Maintenance 2009 Edition 3 ...

Page 91: ... CR 5 2 3 Measure and verify Tenant submetering MR CR 1 1 1 Tenant space Long term commitment MR CR 1 1 5 Maintain exterior walls floor roof MR CR 1 1 1 3 1 2 Maintain exterior walls floor roof MR CR 1 1 1 2 Maintain non structural elements MR CR 1 2 1 1 Maintain non structural elements IEQ PR 2 Yes Minimum acoustical performance IEQ 1 4 1 Reduce particulates Occupied space IEQ 1 5 1 Reduce partic...

Page 92: ... S Design Standards 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 ...

Page 93: ... VRF Multi V Mini Air Source Units 036 047 053 on page VRF Multi V Mini Air Source Units 036 047 053 on page 96 96 MECHANICAL SPECIFICATIONS ...

Page 94: ...eration Single Inverter Compressor The outdoor unit is equipped with one hermetic digitally con trolled inverter driven rotary compressor The compressor is spe cifically designed for the refrigerant provided and is manufactured by LG The frequency inverter is designed by LG and is capable of providing a modulation range from 25Hz 90Hz in Cooling mode and 25Hz 100Hz in Heating mode The compressor m...

Page 95: ...flow is insufficient to satisfy the demand of all indoor units when the system is called on to operate outside the system design param eters In 10 second intervals the outdoor unit microprocessor will record the last three minutes of system run time data in non volatile memory Upon unit malfunction or a power outage that results in a system shutdown the stored system operational data may be re tri...

Page 96: ...P Coefficient Of Performance O M Existing Building Operations and Maintenance LEED Related CR Combination Ratio ODU Outdoor Unit CS Core and Shell LEED Related OUCF Outdoor Unit Correction Factor DB Dry Bulb PDI Power Distribution Integrator dB A Decibels with A frequency weighting PI Power Input DDOAS Decoupled Dedicated Outdoor Air PR Prerequisite LEED Related DI Digital Input PTAC Packaged Term...

Page 97: ...VRF EM BB US 013E06 Supersedes VRF EM BB 001 US 012M27 VRF EM BB 001 US 012D20 VRF EM BB 001 US 011M21 LG Electronics Commercial Air Conditioning Division 11405 Old Roswell Road Alpharetta Georgia 30009 www lg vrf com ...

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