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LG MULTI F Engineering Manual

Multi f; multi f max with lg red heat pump outdoor unit
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Multi-Zone Heat Pump Systems
1.5 to 3.5 Tons
Dual-, Tri-, and Quad-Zone
Multi F
MULTI
MULTI
HEAT PUMP OUTDOOR UNIT
ENGINEERING MANUAL
F
F
MAX
Up to Six Zones
Multi F MAX
WITH

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Summary of Contents for LG MULTI F

  • Page 1 MULTI MULTI WITH HEAT PUMP OUTDOOR UNIT ENGINEERING MANUAL Up to Six Zones Multi-Zone Heat Pump Systems Multi F MAX 1.5 to 3.5 Tons Dual-, Tri-, and Quad-Zone Multi F...
  • Page 2 LATS software programs, and more, log in to www.lghvac.com. For continual product development, LG Electronics U.S.A., Inc. reserves the right to change specifications without notice. © LG Electronics U.S.A., Inc.

  • Page 3: Table Of Contents

    Wiring Diagram .......................................... 33 Refrigerant Flow Diagram ......................................34 Acoustic Data ..........................................35 Operation Range ........................................36 Multi F MAX with LGRED Branch Distribution Unit Product Data ........................37-44 ......................................38 General Data ..........................................39 Dimensions ..........................................40 Wiring Diagram ........................................... 41 Refrigerant Flow Diagram ......................................

  • Page 4: Unit Nomenclature

    MULTI UNIT NOMENCLATURE WITH MULTI Multi-Zone Systems — Indoor Units and Outdoor Units L = LG Type: M = Multi-Zone Component: AN: Art Cool™ Wall-Mounted Indoor Unit N: Standard Wall-Mounted Indoor Unit CN: Four-Way Ceiling-Cassette Indoor Unit DN: Ceiling-Concealed Duct (Low Static) Indoor Unit...

  • Page 5: Lg Air Conditioner Technical Solution (Lats)

    LG offers, free of charge, LG Air Conditioner Technical Solution (LATS) software—a total design solution for LG air conditioning systems. To reduce the risk of designing an improper applied system or one that will not operate correctly, LG prefers that LATS software be used all projects. Formats LATS is available to LG customers in three user interfaces: LATS HVAC, LATS CAD2, and LATS Revit.

  • Page 6: Lg Air Conditioner Technical Solution (Lats)

    LATS can generate an Excel GERP report that can imported into the LG SOPS pricing and ordering system.

  • Page 7: Manual Equipment Selection Procedures

    Multi F heat pump systems can cool or heat, but not simultaneously. When designing larger-capacity Multi F with LGRED heat pump systems or a Multi F MAX with LGRED system, the designer may be able to combine spaces with similar load profiles located near or adjacent to each other into “thermal zones.”...
  • Page 8 In some designs, oversized indoor units may be unavoidable in the case where the smallest size indoor unit available from LG is larger than what is necessary to satisfy the zone load. This scenario may also occur when an indoor unit selection one size down from the selected unit is slightly short of fulfilling the design load requirements, and the designer must choose the next largest size unit.
  • Page 9 To evaluate the total outdoor unit capacity at design conditions, using LATS software (preferred method) or reference the Performance Data Capacity Tables in the Multi F / Multi F MAX with LGRED Performance Data Manual on www.lg-dfs.com. All design temperatures are not explicitly shown in the charts, therefore, interpolation may be necessary to calculate the capacity for specific design conditions.
  • Page 10 • A more accurate method to determine expected capacity would be to apply the outdoor unit’s corrected capacity instead of rated capacity. • For allocated capacity information, see the combination tables in the “Multi F / Multi F MAX with LGRED Combination Data Manual” on www.lg-dfs.com.
  • Page 11 100.0 99.6 99.2 98.7 98.3 97.8 97.4 96.9 96.5 96.0 95.6 Figure 3: Multi F MAX with LGRED Outdoor Unit to Branch Distribution Unit Refrigerant Line Length Derate Chart. 100.0 95.0 Heating capacity 90.0 Cooling 85.0 capacity 80.0 75.0 70.0 32.8...

  • Page 12: Manual Equipment Selection Procedures

    If further system design assistance is needed, or you have a unique ities (applies in 99% of applications – consider total load when application you would like to discuss, contact your LG sales repre- latent load is greater than 30%).

  • Page 13: General Data

    MULTI F WITH LGRED PRODUCT DATA Mechanical Specifications on page 14 General Data on page 15 Electrical Data on page 16 Functions, Controls, Options, and Accessories on page 17 Dimensions on page 18 Wiring Diagrams on page 19-21 Refrigerant Flow Diagrams on page 22-24...
  • Page 14 950 rpm. All Multi F outdoor control devices, and legs to secure the unit during installation.

  • Page 15: General Data

    16. At least two indoor units should be connected. For allocated capacity information, see the combination tables in the "Multi F / Multi F MAX with LGRED Combination Data Manual" on www.lg-dfs.com. For perfor- Piping lengths are equivalent.

  • Page 16: Electrical Data

    At least two indoor units must be connected. For allocated capacity information, see the combination tables in the "Multi F / Multi F MAX with LGRED Combination Data Manual" on www.lg-dfs.com. For performance data, see "Multi F / Multi F MAX with LGRED Performance Data Manual"...

  • Page 17: Functions, Controls, Options, And Accessories

    Dry Contact ZLABGP04A ZLABGP04A ZLABGP04A Low Ambient Wind Baffle Kit (Logical Operation) (Logical Operation) (Logical Operation) Factory-Supplied Drain Heater Compatibility w / prior generation of Multi F Computer LG Monitoring View (LGMV) PRCTIL0 PRCTIL0 PRCTIL0 Mobile LGMV for PLGMVW100 PLGMVW100 PLGMVW100...

  • Page 18: Dimensions

    WITH Dimensions Figure 5: LMU180HHV, LMU240HHV, and LMU300HHV External Dimensions. Unit: Inch Gravity point Part Name Air discharge grille Gas pipe connection Liquid pipe connection Main service valve (Liquid) Main service valve (Gas) © 18 | MULTI F WITH LGRED...

  • Page 19: Wiring Diagram

    MULTI MULTI F WITH LGRED WITH Wiring Diagram Figure 6: LMU180HHV Wiring Diagram. © MULTI F WITH LGRED | 19...
  • Page 20 MULTI MULTI F WITH LGRED WITH Wiring Diagram Figure 7: LMU240HHV Wiring Diagram. © 20 | MULTI F WITH LGRED...
  • Page 21 MULTI MULTI F WITH LGRED WITH Wiring Diagram Figure 8: LMU300HHV Wiring Diagram. © MULTI F WITH LGRED | 21...

  • Page 22: Refrigerant Flow Diagram

    CN_MID_BR Discharge Temperature Thermistor CN_DISCHARGE_BK Condenser Outlet Temperature Thermistor CN_C_PIPE_VI Suction Temperature Thermistor CN_SUCTION_GR Inlet Air Temperature Thermistor CN_AIR_YL Pressure Sensor CN_H_PRESS_RD Hot Gas Valve CN_H_GAS_BK Four-Way Valve CN_4WAY_YL Base Pan Heater CN_HEATER_BL © 22 | MULTI F WITH LGRED...
  • Page 23 CN_MID_BR Discharge Temperature Thermistor CN_DISCHARGE_BK Condenser Outlet Temperature Thermistor CN_C_PIPE_VI Suction Temperature Thermistor CN_SUCTION_GR Inlet Air Temperature Thermistor CN_AIR_YL Pressure Sensor CN_H_PRESS_RD Hot Gas Valve CN_H_GAS_BK Four-Way Valve CN_4WAY_YL Base Pan Heater CN_HEATER_BL © MULTI F WITH LGRED | 23...
  • Page 24 CN_MID_BR Discharge Temperature Thermistor CN_DISCHARGE_BK Condenser Outlet Temperature Thermistor CN_C_PIPE_VI Suction Temperature Thermistor CN_SUCTION_GR Inlet Air Temperature Thermistor CN_AIR_YL Pressure Sensor CN_H_PRESS_RD Hot Gas Valve CN_H_GAS_BK Four-Way Valve CN_4WAY_YL Base Pan Heater CN_HEATER_BL © 24 | MULTI F WITH LGRED...
  • Page 25 Hearing NC-20 NC-20 NC-15 NC-15 NC-15 1000 2000 4000 8000 1000 2000 4000 8000 1000 2000 4000 8000 Octave Band Center Frequency (Hz) Octave Band Center Frequency (Hz) Octave Band Center Frequency (Hz) © MULTI F WITH LGRED | 25...
  • Page 26 MULTI MULTI F WITH LGRED WITH Operation Range Figure 14: Multi F with LGRED Cooling and Heating Operation Ranges. Cooling Heating Continuous Operation Continuous Operation 91.3 57 59 82.4 Indoor Temperature (°F DB) Indoor Temperature (°F WB) © 26 | MULTI F WITH LGRED...

  • Page 27: Acoustic Data

    MULTI F MAX WITH LGRED PRODUCT DATA Mechanical Specifications on page 28 General Data on page 29 Electrical Data on page 30 Functions, Controls, Options, and Accessories on page 31 Dimensions on page 32 Wiring Diagram on page 33 Refrigerant Flow Diagram on page 34...
  • Page 28 ASTM bearings, and a maximum speed up to 950 rpm. Multi F MAX with B-117 salt spray procedure for a minimum of 1,000 hours. Case has LGRED outdoor unit has a horizontal discharge airflow.
  • Page 29 For detailed electrical information, please refer to electric characteristics on page 30. installed per outdoor unit with use of Y-branch accessory (PMBL5620). At least two indoor units should be connected. For allocated capacity information, see the combination tables in the “Multi F / Multi F Piping lengths are equivalent.
  • Page 30 At least two indoor units must be connected. For allocated capacity information, see the combination tables in the "Multi F / Multi F MAX with LGRED Combination Data Manual" on www.lg-dfs.com. For performance data, see "Multi F / Multi F MAX with LGRED Performance Data Manual"...
  • Page 31 PQNUD1S41 Dry Contact Low Ambient Wind Bafflle Kit ZLABGP04A x 2 (Logical Operation) ZLABGP04A x 2(Logical Operation) Factory-Supplied Drain Heater Compatibility w / prior generation of Multi F Computer LG Monitoring View (LGMV) PRCTIL0 PRCTIL0 Mobile LGMV for PLGMVW100 PLGMVW100...
  • Page 32 Figure 16: LMU360HHV and LMU420HHV External Dimensions. 4-holes for anchor bolts Part Name Liquid pipe connection Gas pipe connection 6-1/2 24-13/32 6-1/2 Air discharge grille Power & transmission connection Supporter 14-1/20 Unit: Inch 37-13/32 Center of Gravity © 32 | MULTI F MAX WITH LGRED...
  • Page 33 MULTI MULTI F MAX WITH LGRED WITH Wiring Diagram Figure 17: LMU360HHV and LMU420HHV Wiring Diagram. © MULTI F MAX WITH LGRED | 33...
  • Page 34 Condenser Outlet Temperature Thermistor CN_C_PIPE_VI Suction Temperature Thermistor CN_SUCTION_GR Inlet Air Temperature Thermistor CN_AIR_YL Pressure Sensor CN_H_PRESS_RD Electronic Expansion Valve CN_EEV_MAIN_VI Hot Gas Valve CN_PI_VI_HG_OS_BK Four-Way Valve CN_4WAY_YL Base Pan Heater CN_HEATER_BL © 34 | MULTI F MAX WITH LGRED...
  • Page 35 NC-35 NC-35 NC-30 NC-30 NC-25 NC-25 Approximate Approximate Hearing NC-20 Hearing NC-20 NC-15 NC-15 1000 2000 4000 8000 1000 2000 4000 8000 Octave Band Center Frequency (Hz) Octave Band Center Frequency (Hz) © MULTI F MAX WITH LGRED | 35...
  • Page 36 MULTI MULTI F MAX WITH LGRED WITH Operation Range Figure 21: Multi F MAX with LGRED Cooling and Heating Operation Ranges. Cooling Heating Continuous Operation Continuous Operation 91.3 57 59 82.4 Indoor Temperature (°F DB) Indoor Temperature (°F WB) ©...

  • Page 37: Y-Branch Accessory

    MULTI F MAX WITH LGRED BRANCH DISTRIBUTION (BD) UNIT DATA Mechanical Specifications on page 38 General Data on page 39 Dimensions on page 40 Wiring Diagram on page 41 Refrigerant Flow Diagram on page 42 Y-Branch Accessory on page 43...
  • Page 38 Branch Distribution Unit General Branch distribution units are designed for use with LG Multi F MAX with LGRED (LMU360HHV and LMU420HHV) outdoor units, and are internally piped, wired, assembled and run-tested at the factory. The branch distribution unit is used as...
  • Page 39 Branch distribution Unit can accommodate from one (1) indoor unit up to four (4) indoor units depending on the ports available on the branch distribution Unit. All communication / power (connection) cable to be minimum 16 AWG from the outdoor unit to the branch distribution unit (Multi F MAX with LGRED systems only), and 18 AWG from the branch distribution unit to the indoor unit, stranded, shielded or unshielded (if shielded, it must be grounded to the chassis of the outdoor unit only), and must comply with applicable local and national codes.
  • Page 40 MULTI MULTI F MAX WITH LGRED BD UNIT WITH Dimensions Figure 25: PMBD3620, PMBD3630, PMBD3640, and PMBD3641 External Dimensions. A-C (and PMBD3640 D) Connections: Unit: Inch Liquid Pipe Ø1/4 Gas Pipe Ø3/8 PMBD3641 D Connections: Ø3/4 Liquid Pipe Ø1/4 Gas Pipe Ø1/2...
  • Page 41 MULTI MULTI F MAX WITH LGRED BD UNIT WITH Wiring Diagram Figure 26: PMBD3620, PMBD3630, PMBD3640, PMBD3641 Wiring Diagram. Model Dependant Model Dependant Model Dependant Troubleshooting Model Dependant PMBD3620 BD Unit supplied with "A, B". PMBD3630 BD Unit supplied with "A, B, C".
  • Page 42 MULTI MULTI F MAX WITH LGRED BD UNIT WITH Refrigerant Flow Diagram Figure 27: PMBD3620, PMBD3630, PMBD3640, PMBD3641 Refrigerant Flow Diagram. Main gas piping (Ø 3/4) Outdoor Unit *PMBD3641 Main liquid D Gas: Ø5/8 piping (Ø 3/8) D Gas (Ø3/8) EEV-A C Gas (Ø3/8)
  • Page 43 Multi F MAX with LGRED Y-Branch Kit PMBL5620 The LG-supplied Y-Branch kit PMBL5620 MUST be used when in- Figure 28: stalling two (2) branch distribution units in parallel on one (1) Multi F MAX with LGRED system. Field-supplied fittings are not permit- ted.
  • Page 44 WITH Branch Distribution Unit Orientation Multi F MAX with LGRED branch distribution units can be installed in a multitude of This material is for informational options to fit various building configurations and job or application requirements. Multi F MAX with or educational purposes only.

  • Page 45: Electrical Connections

    ELECTRICAL CONNECTIONS General Information on page 46 Wiring Specifications on page 47 Systems for Multi F / Multi F MAX with LGRED on page 48 Indoor Units / Controllers on page 53...
  • Page 46 MULTI ELECTRICAL CONNECTIONS WITH MULTI General Information • All power (line voltage) wiring and communication cable installation must be performed by trained service providers working in accordance with all local, state, and National Electrical Code (NEC) / UL / ETL federal regulations related to electrical equipment and wiring, and follow- ing the manufacturer product diagrams, requirements, and instructions in this manual.
  • Page 47 MULTI Power Supply / Power Wiring Specifications • Multi F and Multi F MAX with LGRED systems operate at 1Ø, 208-230V, 60Hz, and power Figure 35: Multi F / Multi F MAX with LGRED is wired to the outdoor unit only. The outdoor unit will supply power to the indoor units Outdoor Unit Power Wiring.
  • Page 48 Figure 37: Multi F with LGRED System General Power / Communications System Schematic. Indoor Units Power Supply Circuit Breaker Ground Wiring Outdoor Unit Figure 38: Multi F MAX with LGRED System General Power / Communications System Schematic. Indoor Unit Branch Distribution Unit Power Supply Circuit Breaker Branch Distribution Unit...
  • Page 49 MULTI ELECTRICAL CONNECTIONS WITH MULTI Systems for Multi F with LGRED Figure 39: Multi F with LGRED LMU180HHV System Power Wiring and Communications Cable Connections. Power Supply Main Switch Outdoor Unit Outdoor Unit Terminal Block Circuit Breaker 1(L1) 2(L2) 3(A)
  • Page 50 MULTI ELECTRICAL CONNECTIONS WITH MULTI Systems for Multi F with LGRED Figure 40: Multi F with LGRED LMU240HHV System Power Wiring and Communications Cable Connections. L1 L2 Power Supply Main Switch Outdoor Unit Outdoor Unit Terminal Block Circuit Breaker 1(L1) 2(L2)
  • Page 51 MULTI ELECTRICAL CONNECTIONS WITH MULTI Systems for Multi F with LGRED Figure 41: Multi F with LGRED LMU300HHV System Power Wiring and Communications Cable Connections. L1 L2 Power Supply Main Switch Outdoor Unit Outdoor Unit Terminal Block Circuit Breaker 1(L1) 2(L2)
  • Page 52 MULTI ELECTRICAL CONNECTIONS WITH MULTI Systems for Multi F MAX with LGRED Figure 42: Multi F MAX with LGRED LMU360HHV and LMU420HHV System Power Wiring and Communications Cable Connections. Power Supply Main Switch Outdoor Unit Outdoor Unit Terminal Block Circuit Breaker...
  • Page 53 • If using the LG Controller / Extension cable and the length needs to be further extended, the LG Extension Kit (sold separately) must be used. A maximum of four (4) kits (up to 165 feet) can be used.

  • Page 54: Electrical Connections

    NEVER splice, cut, or extend cable length; always include enough cable to cover Supplied distance between all components. LG Supplied Group Control Kit (PZCWRCG3) For indoor units with CN-REMO connections: Use one (or multiple) Group Control Kit(s) (sold separately) containing extension and Y-splitter cables.

  • Page 55: Piping Limitations And Placement Considerations

    PIPING LIMITATIONS AND PLACEMENT CONSIDERATIONS Piping Limitations on page 56 Selecting the Best Location for the Outdoor Unit on page 58 Outdoor Unit Clearance Requirements on page 60 Installing Outdoor Units Indoors on page 63 Selecting the Best Location for the Indoor Units / Branch Distribution Units on page 66...
  • Page 56 LATS when designing Multi F / MAX with LGRED systems. Device Connection Limitations • The minimum number of connected and operating indoor units to Multi F / Multi F MAX with LGRED systems is two, taking into consider- ation the minimum combination ratio.
  • Page 57 WITH MULTI Following pages present Multi F / MAX with LGRED piping limitations and are for illustrative purposes only. Designers are highly encouraged to use LATS when designing Multi F / MAX with LGRED systems. Example of a Multi F MAX with LGRED System with One Branch Distribution...
  • Page 58 • A location that allows for optimum air flow and is easily accessible for inspection, maintenance, and service. • Where piping between the outdoor unit and indoor unit (and branch distribution unit[s], if Multi F MAX with LGRED) is within allowable limits.

  • Page 59: Rooftop Installations

    MULTI PLACEMENT CONSIDERATIONS WITH MULTI Selecting the Best Location for the Outdoor Unit Planning for Snow and Ice, continued. When deciding 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 side- walks or driveways, which may create unsafe conditions.
  • Page 60 Table 32: Multi F with LGRED 18,000, 24,000, and 30,000 Outdoor Unit Service Access and Allowable Clearances Diagram Legend. Unit: Inch Standard...
  • Page 61 Outdoor Unit Clearance Requirements Multi F MAX with LGRED Outdoor Unit (36,000 and 42,000 Btu/h Capacity) Service Access and Allowable Clearances When installing the outdoor unit, consider service, inlet, and outlet, and minimum allowable space requirements as illustrated in the following diagrams.
  • Page 62 MULTI PLACEMENT CONSIDERATIONS WITH MULTI Outdoor Unit Clearance Requirements Clearance Requirements when Different Obstacles are Present, continued. (Unit: Inch) Where there are obstacles on both suction Obstacles above and on Where there are obstacles on both suction and discharge sides (discharge side obstacle the air discharge side.
  • Page 63 • Maintains coil heat transfer efficiency by reducing the number of and shortening the cycle time for defrost operation. • Easier maintenance and servicing during inclement weather. • When mounted in a fully enclosed space, limiting the ambient air temperature may allow the Multi F / Multi F MAX with LGRED system designer to eliminate oversizing.
  • Page 64 MULTI PLACEMENT CONSIDERATIONS WITH MULTI Installing Outdoor Units Indoors Provide a means to drain the condensate generated during heating mode and defrost cycle in addition 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. •...
  • Page 65 MULTI PLACEMENT CONSIDERATIONS WITH MULTI Installing Outdoor Units Indoors Open Rate by Louver Radian Figure 51: Open Rate by Louver Radian Formula. ho = h * COS Total Area (A) = H * W Number of Open Spaces (N) = (Number of Louvers - 1) Effective Area (Af) = ho * W * N Louver Open Rate (n) = Af / A Af = A * n...
  • Page 66 Selecting the Best Location for the Branch Distribution (BD) Units Branch distribution (BD) units are used only with Multi F MAX with LGRED systems to distribute the refrigerant from the outdoor unit up to six (6) indoor units. Select a location indoors that will meet the following conditions: •...
  • Page 67 Branch Distribution Unit Orientation Multi F MAX with LGRED branch distribution units can be installed in a multitude of options to fit various building configurations and job or application requirements. The installation location of the PCB within the branch distribution unit can be changed for easier service access, depending on the branch distribution unit installation itself.
  • Page 68 20001747 ISO 9001: 2008 LG ELECTRONICS INC. LG Electronics Products Support 1-888-865-3026 USA LG Electronics, U.S.A., Inc. Follow the prompts for HVAC products. Air Conditioning Technologies 4300 North Point Parkway Alpharetta, Georgia 30022 www.lg-dfs.com New Issue: EM_MultiF_MAX_LGRED_ODU_10_17...

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