Lennox MPA009S4S Service Manual
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Lennox MPA009S4S Service Manual

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MINI-SPLIT SYSTEMS SERVICE MANUAL
CORP1602-L9
3/2017
Supersedes 10/2016
WARNING
Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss
of life.
Installation and service must be performed by a licensed professional HVAC installer (or equivalent) or service agency
1

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Summary of Contents for Lennox MPA009S4S

  • Page 1 MINI-SPLIT SYSTEMS SERVICE MANUAL CORP1602-L9 3/2017 Supersedes 10/2016 WARNING Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life. Installation and service must be performed by a licensed professional HVAC installer (or equivalent) or service agency...

  • Page 2: Table Of Contents

    Table of Contents 1. Single and Multiple Zone Outdoor Units ................5 1.1. Model Number Identification ............................5 1.2. MPA Single-Zone Specifications Outdoor Units (0.75 - 1.5 Ton) ................... 6 1.3. MPA Single-Zone Specifications Outdoor Units (2.0 - 4.0 Ton) ..................7 1.4. MPB Single-Zone Specifications Outdoor Units (0.75 - 1.5 Ton) .................. 8 1.5. MPB Single-Zone Specifications Outdoor Units (2 - 4 Ton) ..................9 1.6. MLA Single-Zone Specifications Outdoor Units (0.75 - 2 Ton) ..................10 1.7. MPA Multi-Zone Specifications Outdoor Units (1.5 - 2.5 Ton) ..................11 1.8.
  • Page 3 6.3. MLA Multi-Zone System Combinations ........................40 7. Refrigeration Pipe Work ......................41 7.1. MPA and MPB Single-Zone Refrigerant Cycle Diagram ..................... 41 7.2. MPA and MPB Two-Zone Refrigerant Cycle Diagram ....................41 7.3. MPA and MPB Three-Zone Refrigerant Cycle Diagram ....................42 7.4. MPA and MPB Four-Zone Refrigerant Cycle Diagram ....................42 7.5. MPA and MPB Five-Zone Refrigerant Cycle Diagram ....................43 7.6. Single-Zone Piping Limitations............................ 44 7.7. Multi-Zone Piping Limitations ............................44 8.
  • Page 4 19.4. Outdoor Unit Digital Display Tube ..........................93 19.5. Dry Mode Operation - MWMA and MWMB ......................... 93 19.6. Test Run - MWDA and MWMB ............................ 93 19.7. Double-Check Pipe Connections ..........................94 19.8. Ambient Temperature is Below 63°F (17°C) ....................... 94 20. Quick Reference Guide - Error Codes ................. 95 21. Single-Zone Outdoor Unit LED Locations ................97 22. Multi-Zone Outdoor Unit LEDs and SW1 Locations ............101 23.

  • Page 5: Single And Multiple Zone Outdoor Units

    Single and Multiple Zone Outdoor Units 1.1. Model Number Identification M P A 009 S 4 S - 1 P Series Type Voltage M = Mini-Split L = 115V-1 phase-60hz P = 208/230V-1 phase-60hz Unit Type L = Low Ambient Heat Pump Minor Design Sequence P = Heat Pump 1 = 1st Revision Major Design Sequence A = 1st Generation Refrigerant Circuits B = 2nd Generation...

  • Page 6: Mpa Single-Zone Specifications Outdoor Units (0.75 - 1.5 Ton)

    1.2. MPA Single-Zone Specifications Outdoor Units (0.75 - 1.5 Ton) Nominal Size - Tons 0.75 Outdoor Unit Model No. MPA009S4S MPA012S4S MPA018S4S Ambient Temperature Operating Cooling 5 - 122 5 - 122 5 - 122 Range - °F Heating –13 - 86 –13 - 86 –13 - 86...

  • Page 7: Mpa Single-Zone Specifications Outdoor Units (2.0 - 4.0 Ton)

    1.3. MPA Single-Zone Specifications Outdoor Units (2.0 - 4.0 Ton) Nominal Size - Tons Outdoor Unit Model No. MPA024S4S MPA030S4S MPA036S4S MPA048S4S Ambient Temperature Operating Cooling 5 - 122 5 - 122 5 - 122 5 - 122 Range - °F Heating –13 - 86 –13 - 86 –13 - 76 –13 - 76 Sound Data (dBA)

  • Page 8: Mpb Single-Zone Specifications Outdoor Units (0.75 - 1.5 Ton)

    1.4. MPB Single-Zone Specifications Outdoor Units (0.75 - 1.5 Ton) Nominal Size - Tons 0.75 Outdoor Unit Model No. MPB009S4S MPB012S4S MPB018S4S Ambient Temperature Operating Cooling –13 - 122 –13 - 122 –13 - 122 Range - °F Heating –13 - 86 –13 - 86 –13 - 86 Energy Star Sound Data (dBA) Cooling/Heating (115V)

  • Page 9: Mpb Single-Zone Specifications Outdoor Units (2 - 4 Ton)

    1.5. MPB Single-Zone Specifications Outdoor Units (2 - 4 Ton) Nominal Size - Tons Outdoor Unit Model No. MPB024S4S MPB030S4S MPB036S4S MPB048S4S Ambient Temperature Operating Cooling –13 - 122 –13 - 122 –13 - 122 –13 - 122 Range - °F Heating –13 - 86 –13 - 86 –13 - 86 –13 - 86 Energy Star...

  • Page 10: Mla Single-Zone Specifications Outdoor Units (0.75 - 2 Ton)

    1.6. MLA Single-Zone Specifications Outdoor Units (0.75 - 2 Ton) Nominal Size - Tons 0.75 Outdoor Unit Model No. MLA009S4S-1P MLA012S4S-1P MLA018S4S-1P MLA024S4S-1P Ambient Temperature Operating Cooling –22 - 122 –22 - 122 –22 - 122 –22 - 122 Range - °F Heating –22 - 86 –22 - 86 –22 - 86 –22 - 86 Sound Data (dBA)

  • Page 11: Mpa Multi-Zone Specifications Outdoor Units (1.5 - 2.5 Ton)

    1.7. MPA Multi-Zone Specifications Outdoor Units (1.5 - 2.5 Ton) Nominal Size - Tons Outdoor Unit Model No. MPA018S4M MPA030S4M Number of Zones Up to 3 AHRI Ratings System Type Ducted Non-Ducted Ducted Non-Ducted Cooling - Btuh 17,000 18,000 27,000 25,000 High Temperature Heating - Btuh 18,000 18,500 32,000 32,000 Low Temperature Heating - Btuh 10,900 11,000 20,000 20,000 SEER 18.00 21.00...

  • Page 12: Mpa Multi-Zone Specifications Outdoor Units (3 - 4 Ton)

    1.8. MPA Multi-Zone Specifications Outdoor Units (3 - 4 Ton) Nominal Size - Tons Outdoor Unit Model No. MPA036S4M MPA048S4M Number of Zones Up to 4 Up to 5 AHRI Ratings System Type Ducted Non-Ducted Ducted Non-Ducted Cooling - Btuh 34,000 36,000 42,000 42,000 High Temperature Heating - Btuh 36,000 36,000 51,000 49,000 Low Temperature Heating - Btuh 24,400 23,400 31,800 31,200...

  • Page 13: Mpb Multi-Zone Specifications Outdoor Units (1.5 - 2.5 Ton)

    1.9. MPB Multi-Zone Specifications Outdoor Units (1.5 - 2.5 Ton) Nominal Size - Tons Outdoor Unit Model No. MPB018S4M MPB030S4M Number of Zones Up to 3 AHRI Ratings System Type Ducted Non-Ducted Ducted Non-Ducted Cooling - Btuh 18,000 18,000 27,000 28,000 High Temperature Heating - Btuh 18,500 19,000 27,000 28,000 Low Temperature Heating - Btuh 11,400 12,000 16,200 17,200 SEER 18.4 22.5...

  • Page 14: Mpb Multi-Zone Specifications Outdoor Units (3 - 4 Ton)

    1.10. MPB Multi-Zone Specifications Outdoor Units (3 - 4 Ton) Nominal Size - Tons Outdoor Unit Model No. MPB036S4M MPB048S4M Number of Zones Up to 4 Up to 5 AHRI Ratings System Type Ducted Non-Ducted Ducted Non-Ducted Cooling - Btuh 36,000 36,000 48,000 48,000 High Temperature Heating - Btuh 36,000 36,000 50,000 48,000 Low Temperature Heating - Btuh 22,800 24,600 33,000 29,600...

  • Page 15: Mla Multi-Zone Specifications Outdoor Units (1.5 - 3 Ton)

    1.11. MLA Multi-Zone Specifications Outdoor Units (1.5 - 3 Ton) Nominal Size - Tons Outdoor Unit Model No. MLA018S4M MLA030S4M MLA036S4M Number of Zones Up to 3 Up to 4 AHRI Ratings System Type Ducted Non-Ducted Ducted Non-Ducted Ducted Non-Ducted Cooling - Btuh 18,000 19,000 27,000 28,000 35,000 36,000 High Temperature Heating - Btuh 18,000 20,000 27,000 28,000...

  • Page 16: Single-Zone Outdoor Unit Dimensions

    1.12. Single-Zone Outdoor Unit Dimensions TYPICAL APPEARANCE OF UNITS Unit of Model Measurement MPA009S4S-*L inches 33-1/4 21-5/8 11-3/8 12-3/4 MPA009S4S-*P MPA012S4S-*L MPA012S4S-*P inches 36-1/8 27-1/2 12-3/4 MPA018S4S-*P MPA024S4S-*P inches 40-5/8 25-1/4 31-7/8 15-1/8 MPA030S4S-*P 1032 MPA036S4S-*P inches 40-1/4 53-3/4 15-3/8...

  • Page 17: Multi-Zone Outdoor Unit Dimensions

    1.13. Multi-Zone Outdoor Unit Dimensions TYPICAL APPEARANCE OF UNITS Unit of Model Measurement inches 35-3/4 27-3/8 12-3/4 13-1/8 MPA018S4M-*P inches 37-1/4 25-1/4 31-7/8 15-1/2 MPA030S4M-*P MPA036S4M-*P inches 36-7/8 32-7/8 54-1/2 15-3/8 MPA048S4M-*P 1385 inches 21-1/4 27-5/8 13-1/4 13-3/4 MPB018S4M-*P inches 40-3/4 26-1/2 31-7/8...

  • Page 18: Outdoor Unit Clearances

    1.14. Outdoor Unit Clearances 24 (610) Air Inlet (305) (305) (610) (2007) Air Outlet Minimum rear clearance can be 6 inches (152 mm) when mounted on brackets and with no obstructions on the other three sides. 24 (610) Air Inlet (305) (305) (610)

  • Page 19: M22A, M33A And M33B Cassette Non-Ducted Indoor Units

    2. M22A, M33A and M33B Cassette Non-Ducted Indoor Units 2.1. Model Number Identification CASSETTE NON-DUCTED INDOOR UNITS M 22 A 012 S 4 - 1 P Series Type Voltage M = Mini-Split P = 208/230V-1 phase-60hz Unit Type Minor Design Sequence 22 = 2x2 Cassette Non-Ducted Unit 1 = 1st Revision 33 = 3x3 Cassette Non-Ducted Unit 2 = 2nd Revision Major Design Sequence Refrigerant Type A = 1st Generation...

  • Page 20: M33A And M33B Indoor Unit Specifications

    2.3. M33A and M33B Indoor Unit Specifications Model No. M33A024S4-*P M33A036S4-*P M33A048S4-*P** and M33B048S4-*P Nominal Tons Power Supply - 60 hz - 1 phase 208/230V 208/230V 208/230V Rated load amps Output (W) Room Temperature Cooling 62 - 90 62 - 90 62 - 90 Range (°F) Heating 32 - 86 32 - 86 32 - 86 Air Volume - cfm (High/Medium/Low) 700/635/575 1095/960/810 1175/1030/855 Sound Data (dBA) - Low/Medium/High...

  • Page 21: M22A Indoor Unit Dimensions

    2.4. M22A Indoor Unit Dimensions M22A009S4, M22A012S4, M22A018S4 DRAIN CONNECTION PIPE LIQUID PIPE SIDE VIEW 10-3/8 (264) 11-1/4 11-1/4 5-3/4 5-3/4 (286) (286) (146) (146) 20-5/8 (524) 22-1/2 (572) 6 in. (152 mm) 6 in. (152 mm) Diameter Diameter LEFT SIDE VIEW 21-1/2 (546) RIGHT SIDE VIEW 22-1/2 (572)

  • Page 22: M33A And M33B Indoor Unit Dimensions

    2.5. M33A and M33B Indoor Unit Dimensions M33A024S4, M33A036S4, M33A048S4 and M33B048S4 PIPE LIQUID PIPE 30-3/4 (781) 33-1/8 (841) DRAIN CONNECTION RIGHT SIDE VIEW 26-3/4 (679) 33-1/8 (841) BOTTOM VIEW (Body) Size 8-1/8 9-5/8 11-1/4 OUTLET OUTLET DIFFUSER INLET PANEL SIDE VIEW 37-3/8 (949)

  • Page 23: M22A, M33A And M33B Indoor Unit Clearances

    2.6. M22A, M33A and M33B Indoor Unit Clearances INSTALLATION HANGERS LEVELING ADJUSTMENT NUT (4) CEILING OUTLET OUTLET DIFFUSER INLET PANEL 23-5/8 (600) (Ceiling Opening) 36” (914 mm) 36” 36” (914 mm) (914 mm) 36” (914 mm) Minimum Clearance from Structural Ceiling to Drop Ceiling: M22A009, M22A012, M22A018 -- 10-1/4”...

  • Page 24: Mmda Ducted Indoor Units

    3. MMDA Ducted Indoor Units 3.1. Model Number Identification M MD A 012 S 4 - 1 P Series Type Voltage M = Mini-Split P = 208/230V-1 phase-60hz Unit Type Minor Design Sequence MD = Medium Static Ducted Unit 1 = 1st Revision 2 = 2nd Revision Major Design Sequence Refrigerant Type A = 1st Generation 4 = R-410A B = 2nd Generation Nominal Cooling Capacity Cooling Efficiency 009 = .75 tons S = Standard Efficiency...

  • Page 25: Indoor Unit Blower Data

    3.3. Indoor Unit Blower Data 3.3.1. MMDA009S4-*P and MMDA012S4-*P Low Speed Medium Speed High Speed 0.20 0.30 0.18 0.20 0.25 0.16 0.14 0.20 0.15 0.12 0.10 0.15 0.10 0.08 0.10 0.06 0.05 0.04 0.05 0.02 0.00 0.00 0.00 Air Volume - cfm Air Volume - cfm Air Volume - cfm 3.3.2.
  • Page 26 3.3.3. MMDA024S4-*P Low Speed Medium Speed High Speed 0.20 0.30 0.18 0.20 0.25 0.16 0.14 0.20 0.15 0.12 0.10 0.15 0.10 0.08 0.10 0.06 0.05 0.04 0.05 0.02 0.00 0.00 0.00 Air Volume - cfm Air Volume - cfm Air Volume - cfm 3.3.4.
  • Page 27 3.3.5. MMDA048S4-*P Low Speed Medium Speed High Speed 0.50 0.40 0.45 0.45 0.40 0.35 0.40 0.35 0.30 0.35 0.30 0.25 0.30 0.25 0.20 0.25 0.20 0.20 0.15 0.15 0.15 0.10 0.10 0.10 0.05 0.05 0.05 0.00 0.00 0.00 1050 1000 1100 1200 Air Volume - cfm...

  • Page 28: Indoor Unit Dimensions

    3.4. Indoor Unit Dimensions MOUNTING ELECTRICAL LUGS (4) CONTROL 1 (25) 1 (25) 3/4 (19) 3/4 (19) FRESH AIR INTAKE 3-5/8 (92) Diameter (015 thru 018) 5 (127) Diameter (024 thru 048) TOP VIEW MOUNTING LUGS (4) SUPPLY AIR OPENING FRONT VIEW SIDE VIEW LIQUID...

  • Page 29: Indoor Unit Clearances

    3.5. Indoor Unit Clearances Wall 20 (508) Minimum Service Clearance MEDIUM STATIC DUCTED Flow UNIT 24 (610) Minimum Service Clearance Wall 24 (610) Minimum Service Clearance TOP VIEW Ceiling 1 (25) Minimum Clearance 1 (25) Minimum Clearance Suspended Ceiling FRONT VIEW...

  • Page 30: Mwma And Mwmb Wall Mounted Indoor Units

    4. MWMA and MWMB Wall Mounted Indoor Units 4.1. Model Number Identification M WM A 012 S 4 - 1 P Series Type Voltage M = Mini-Split L = 115V-1 phase-60hz P = 208/230V-1 phase-60hz Unit Type WM = Wall-Mounted Non-Ducted Unit Minor Design Sequence 1 = 1st Revision Major Design Sequence 2 = 2nd Revision A = 1st Generation B = 2nd Generation Refrigerant Type 4 = R-410A Nominal Cooling Capacity...

  • Page 31: Indoor Unit Dimensions

    4.4. Indoor Unit Dimensions Size MWMA009S4S-*L MWMB009S4S-*L MWMA012S4S-*L 32-7/8 29-1/4 7-7/8 MWMB012S4S-*L MWMA009S4S-*P MWMA012S4S-*P MWMA018S4S-*P 12-3/8 34-3/4 8-5/8 MWMA024S4S-*P MWMA030S4S-*P 46-3/4 1187 13-1/2 42-1/2 1080 10-1/4 MWMB030S4S-*P 4.5. Indoor Unit Clearances Ceiling 6” (152 mm) Minimum Clearance Wall Wall 5” 5”...

  • Page 32: Mcfa And Mcfb Ceiling / Floor Indoor Units

    5. MCFA and MCFB Ceiling / Floor Indoor Units 5.1. Model Number Identification M CF A 024 S 4 - 1 P Series Type Voltage M = Mini-Split P = 208/230V-1 phase-60hz Unit Type Minor Design Sequence CF = Ceiling/Floor Non-Ducted 1 = 1st Revision 2 = 2nd Revision Major Design Sequence Refrigerant Type A = 1st Generation 4 = R-410A B = 2nd Generation...

  • Page 33: Indoor Unit Dimensions

    5.3. Indoor Unit Dimensions MCFA012S4, MCFA018S4 Mounting Brackets (2) (Furnished, 35-3/4 (908) Field Installed) (660) 7-7/8 Refrigerant (200) Piping 7-1/8 (181) 1-5/8 (41) 39 (991) Refrigerant 3/4 (19) (203) Piping SIDE VIEW FRONT VIEW BACK VIEW Refrigerant Opening 3/4 (19) Piping 4 x 4 (100 x 100) 1-5/8 (41)

  • Page 34: Indoor Unit Clearances

    5.4. Indoor Unit Clearances CEILING APPLICATIONS (19) DROP CEILING SIDE VIEW SUPPLY CEILING AND FLOOR APPLICATIONS WALL WALL (610) (610) FRONT VIEW FLOOR APPLICATIONS Unit Flush with Wall SUPPLY (610) (Service Clearance Front of Unit) SIDE VIEW...

  • Page 35: Indoor / Outdoor Unit Combinations

    6. Indoor / Outdoor Unit Combinations 6.1. MPA Multi-Zone System Combinations NOTE - For multi-zone systems, the total capacity of all indoor units must be 66% to 133% of the outdoor unit capacity. Indoor Unit Nominal Cooling Capacity at Rated Nominal Heating Capacity at Rated Number Outdoor Unit...
  • Page 36 NOTE - For multi-zone systems, the total capacity of all indoor units must be 66% to 133% of the outdoor unit capacity. Indoor Unit Nominal Cooling Capacity at Rated Nominal Heating Capacity at Rated Number Outdoor Unit Capacity System Capacity (Btuh) System Capacity (Btuh) Model No.

  • Page 37: Mpb Multi-Zone System Combinations

    6.2. MPB Multi-Zone System Combinations NOTE - For multi-zone systems, the total capacity of all indoor units must be 66% to 133% of the outdoor unit capacity. Indoor Unit Nominal Cooling Capacity at Rated System Nominal Heating Capacity at Rated System Number Outdoor Unit Capacity...
  • Page 38 NOTE - For multi-zone systems, the total capacity of all indoor units must be 66% to 133% of the outdoor unit capacity. Indoor Unit Nominal Cooling Capacity at Rated System Nominal Heating Capacity at Rated System Number Outdoor Unit Capacity Capacity (Btuh) Capacity (Btuh) Model No.
  • Page 39 NOTE - For multi-zone systems, the total capacity of all indoor units must be 66% to 133% of the outdoor unit capacity. Indoor Unit Nominal Cooling Capacity at Rated System Nominal Heating Capacity at Rated System Number Outdoor Unit Capacity Capacity (Btuh) Capacity (Btuh) Model No.

  • Page 40: Mla Multi-Zone System Combinations

    6.3. MLA Multi-Zone System Combinations NOTE - For multi-zone systems, the total capacity of all indoor units must be 66% to 133% of the outdoor unit capacity. Indoor Unit Nominal Cooling Capacity at Rated Nominal Heating Capacity at Rated Number Outdoor Unit Capacity System Capacity (Btuh)

  • Page 41: Refrigeration Pipe Work

    7. Refrigeration Pipe Work 7.1. MPA and MPB Single-Zone Refrigerant Cycle Diagram Electronic CAPILIARY TUBE CAPILIARY TUBE expansion valve LIQUID SIDE 2-WAY VALVE T3 Condenser temp. sensor Indoor Coil Outdoor Coil T4 Ambient T1 Room temp. temp. sensor sensor T2 Evaporator temp.

  • Page 42: Mpa And Mpb Three-Zone Refrigerant Cycle Diagram

    7.3. MPA and MPB Three-Zone Refrigerant Cycle Diagram INDOOR OUTDOOR EXV A CAPILIARY A LIQUID VALVE A EXV B CAPILIARY B CHECK VALVE LIQUID VALVE B EXV C CAPILIARY C LIQUID VALVE C Condenser temp. sensor CAPILIARY TUBE T4 Ambient T1 Room Indoor Coil Outdoor Coil...

  • Page 43: Mpa And Mpb Five-Zone Refrigerant Cycle Diagram

    7.5. MPA and MPB Five-Zone Refrigerant Cycle Diagram INDOOR OUTDOOR EXV A CAPILIARY A LIQUID VALVE A EXV B CAPILIARY B LIQUID VALVE B EXV C CAPILIARY C CHECK VALVE LIQUID VALVE C EXV D CAPILIARY D LIQUID VALVE D Condenser temp.

  • Page 44: Single-Zone Piping Limitations

    7.6. Single-Zone Piping Limitations Minimum Line Set Length - 10 ft. (3m) Maximum Line Set OUTDOOR UNIT INDOOR UNIT Length Maximum Line Set Length Maximum Maximum Elevation - Elevation - INDOOR UNIT Outdooor Outdooor Unit BELOW Unit ABOVE Indoor Unit Indoor Unit OUTDOOR UNIT Minimum Line Set...
  • Page 45 INDOOR UNIT INDOOR UNIT Maximum Elevation - Outdoor Unit BELOW INDOOR UNIT Indoor Units 49 ft. (15 m) NOTE - Minimum Line Set Length - 10 ft. (3 m) per Indoor Unit NOTE - Maximum Line Set NOTE - Maximum Difference in Elevation Between Length Includes ALL Indoor Units - 33 ft.

  • Page 46: Master Valves (3- To 5-Zone Outdoor Units)

    8. Master Valves (3- to 5-Zone Outdoor Units) • 3-zone, 4-zone and 5-zone (not 2-zone) multi-zone units have a master valve on each refrigerant line. • The master valve controls refrigerant to all of the zone-supply valves. • Open the master valves prior to opening the zone-supply valves. Liquid Line Master Valve Vapor Line Master Valve...

  • Page 47: Mpa, Mpb And Mla Outdoor Unit Connections And Line Set Usage

    9. MPA, MPB and MLA Outdoor Unit Indoor Unit Line Set Outdoor No. of Connections and Line Set Usage Capacity Required Model Zones (Unit No.) (Liquid x Gas) Indoor Unit Line Set 009 (B) 1/4 in. x 3/8 in. Outdoor No. of Capacity Required Model Zones 018 (A) 1/4 in. x 1/2 in.
  • Page 48 Indoor Unit Line Set Indoor Unit Line Set Outdoor No. of Outdoor No. of Capacity Required Capacity Required Model Zones Model Zones (Unit No.) (Liquid x Gas) (Unit No.) (Liquid x Gas) 009 (B) 1/4 in. x 3/8 in. 009 (B) 1/4 in. x 3/8 in. 009 (C) 1/4 in. x 3/8 in. 024 (A) 3/8 in.
  • Page 49 Indoor Unit Line Set Indoor Unit Line Set Outdoor No. of Outdoor No. of Capacity Required Capacity Required Model Zones Model Zones (Unit No.) (Liquid x Gas) (Unit No.) (Liquid x Gas) 009 (C) 1/4 in. x 3/8 in. 009 (B) 1/4 in. x 3/8 in. 012 (B) 1/4 in. x 1/2 in. 009 (C) 1/4 in. x 3/8 in.
  • Page 50 Indoor Unit Line Set Indoor Unit Line Set Outdoor No. of Outdoor No. of Capacity Required Capacity Required Model Zones Model Zones (Unit No.) (Liquid x Gas) (Unit No.) (Liquid x Gas) 009 (A) 1/4 in. x 3/8 in. 009 (A) 1/4 in. x 3/8 in. 009 (B) 1/4 in. x 3/8 in. 009 (B) 1/4 in. x 3/8 in.
  • Page 51 Indoor Unit Line Set Indoor Unit Line Set Outdoor No. of Outdoor No. of Capacity Required Capacity Required Model Zones Model Zones (Unit No.) (Liquid x Gas) (Unit No.) (Liquid x Gas) 009 (B) 1/4 in. x 3/8 in. 012 (B) 1/4 in. x 1/2 in. 018 (A) 1/4 in. x 1/2 in. 012 (C) 1/4 in. x 1/2 in.

  • Page 52: Power Wiring For Outdoor And Indoor Units (Diagrams)

    10. Power Wiring for Outdoor and Indoor Units (Diagrams) CAUTION This unit must be properly grounded and protected by a circuit breaker. The ground wire for the unit must not be connected to a gas or water pipe, a lightning conductor or a telephone ground wire. Do not connect power wires to the outdoor unit until all other wiring and piping connections have been com- pleted. Install all wiring at least 3 feet (1 m) away from televisions, radios or other electronic devices in order to avoid the possibility of interference with the unit operation.
  • Page 53 208/230V Indoor Unit 208/230V Outdoor Unit Terminal Block Terminal Block L1 L2 NOTE: Use minimum of 18 gauge stranded wiring. From Power Suppl y Outdoor Unit Indoor Unit Figure 2. Single-Zone Wiring 30K and Below 208/230V Indoor Unit B 208/230V Indoor Unit A 208/230V Outdoor Unit Terminal Block Terminal Block...
  • Page 54 208/230V Outdoor Unit Terminal Block 208/230V Indoor Unit 208/230V Indoor Unit 1(A) 2(A) 3(A) 1(B) 2(B) 3(B) 1(C) 2(C) 3(C) 1(D) 2(D) 3(D) 1(E) 2(E) 3(E) Terminal Block Terminal Block From Power Suppl y Indoor Unit E To Indoor Unit A To Indoor Unit B Indoor Unit D To Indoor Unit C...

  • Page 55: Outdoor Unit Diagrams

    CN10 POWER SUPPLY BLACK BLACK 115V Typical wiring diagram. Refer to wiring diagram on the unit for actual wiring. REACTOR Figure 6. 115V MPA009S4S-1L and MPA012S4S-1L Outdoor Unit Wiring Diagram COMPRESSOR CRANKCASE HEATER CN21 CN31 CN28 CN29 CN30 CN22 CN33 HEATER Typical wiring diagram.
  • Page 56 OUT DOOR CN414 CRANKCASE HEATER CN15 L-OUT BLUE CN13 CN12 BLUE OUTDOOR CN14 MAIN BLACK YELLOW CN6-1 CN10 COMPRESSOR OUTDOOR COIL COMPRESSOR OUTDOOR TEMP.SENSOR TEMP. TEMP.SENSOR Typical wiring diagram. Refer to wiring diagram on the unit for actual wiring. Figure 8. 208/230V MPA018S4S-1P Outdoor Unit Wiring Diagram Compressor L-OUT...
  • Page 57 BLACK V1.0 2015/5/08 COMP BLUE CODE PART NAME COMPRESSOR DISCHARGE COMPRESSOR COMP TEMP. SENSOR OUTDOOR DC FAN HEAT1 CRANKCASE HEATER CN12 CN11 CN33 H EAT 2 P A N H E A T E R H-PRO HIGH PRESSURE SWITCH L-PRO BLUE LOW PRESSURE SWITCH BLACK...
  • Page 58 YELLOW YELLOW Compressor and Outdoor Fan Control Board CODE PART NAME BLACK COMPRESSOR COMP CN15 CN14 AC CURRENT DETECTOR BLUE DIODE MODULE CN39 DCFAN1,DCFAN2 OUTDOOR DC FAN HEAT_Y CRANKCASE HEATER HEAT_D PAN HEATER H-PRO HIGH PRESSURE SWITCH PFC INDUCTOR CN22 L-PRO LOW PRESSURE SWITCH CN11...
  • Page 59 BLACK BLUE BLUE BROWN CN 1A OUTDOOR BLUE MAIN 4-WAY VALVE BLACK CRANKCASE HEATER COMPRESSOR HEATER CN 21 CN 7 CN 31 OUTDOOR Figure 14. 208/230V MPB009S4S-*P and MPB012S4S-*P Outdoor Unit Wiring Diagram Figure 15. 208/230V MPB018S4S-*P and MPB024S4S-*P Outdoor Unit Wiring Diagram...
  • Page 60 • • • • • COMPONENT IN DASH LINE IS OPTIONAL OR FIELD WIRING. 4-WAY VALVE Figure 16. 208/230V MPB030S4S-*P, Outdoor Unit Wiring Diagram BLACK CO MP FM 1 BLUE CN20 CN34 4-WAY VALVE BLUE BLACK BLUE CN22 DRIVER BOARD CN33 BLUE BLACK...

  • Page 61: Mla Single-Zone

    YELLOW YELLOW C ODE PAR T N AME C OMP C OMP R E S S OR AC CURRENT DETECTOR C T 1 DIO DE MODULE E LE C T R IC E XPANS IO N E XV VALV E FM1,FM2 OUTDOOR DC FAN HE AT 1...

  • Page 62: Mpa And Mpb Multi-Zone

    BLACK COMP BLUE BLACK CN33 CN20 BLUE YELLOW 4-WAY1 CN54 BLUE BLACK BLUE BLUE CN51 HEAT1 CN53 CN10 Crankcase Heater BLUE CN22 CN52 CN40 HEAT2 CN44 Base Pan Heater YELLOW YELLOW H-PRO BLACK CODE PART NAME L-PRO COMPRESSOR COMP CAP1 FAN MOTOR CAPACITOR ELECTRIC EXPANSION VALVE...
  • Page 63 L-PRO H-PRO LOW PRESSURE SWITCH HIGH PRESSURE SWITCH INDOOR COIL OUTLET TEMP.SENSOR OUTDOOR TEMP. SENSOR T3 OUTDOOR COIL TEMP. SENSOR T5 COMPRESSOR DISCHARGE TEMP. ELECTRONIC EXPANSION CN11 VALVE CN12 BLUE 1(A) 2(A) 3(A) 1(B) 2(B) 3(B) 1(C) 2(C) 3(C) 4 WAY CRANKCASE VALVE HEATER...
  • Page 64 YELLOW CODE PART NAME YELLOW COMPRESSOR COMP AC CURRENT DETECTOR BLACK Ferrite bead DIODE MODULE CN15 CN14 BLUE DCFAN1,DCFAN2 OUTDOOR DC FAN HEAT_Y CRANKCASE HEATER CN39 Ferrite bead HEAT_D PAN HEATER Ferrite bead H-PRO HIGH PRESSURE SWITCH PFC INDUCTOR L-PRO LOW PRESSURE SWITCH CN13 4-WAY VALVE...
  • Page 65 HEAT2 HEAT1 1(A) 2(A) 3(A) 1(B) 2(B) 3(B) 1(C) 2(C) 3(C) CRANKCASE HEATER HEATER Figure 26. MPB030S4M-*P Outdoor Unit Wiring Diagram FM 1 BLACK CO MP BLUE CN20 4-WAY VALVE BLACK BLUE BLUE BLUE BLUE CN21 DRIVER BOARD CN33 BLUE CN17 HEAT_1 CN10...

  • Page 66: Mla Multi-Zone

    YELLOW YELLOW C ODE PAR T N AME C OMP C OMP R E S S OR AC CURRENT DETECTOR C T 1 DIO DE MODULE E LE C T R IC E XPANS IO N E XV VALV E CN13 FM1, FM2 OUTDOOR DC FAN...
  • Page 67 HE AT _1 HE AT _2 GN D COMPRESSOR DISCHARGE TEMP. SENSOR OUTDOOR COIL HEAT_1 CRANKCASE HEATER TEMP. SENSOR OUTDOOR HEAT_2 TEMP. SENSOR INDOOR COIL OUTLET TEMP. SENSOR Figure 30. MLA030S4M-1P Outdoor Unit Wiring Diagram AC CURRENT DETECTOR HE AT _1 HE AT _2 PAN HEATER COMPRESSOR...

  • Page 68: Indoor Unit Diagrams

    12. Indoor Unit Diagrams 12.1. MWMA and MWMB Indoor Unit CN10A CN3(CN301) CN501 Contoller OPTIONAL CN403 DISPLAY BOARD Wire Contoller To CCM Comm.Bus Figure 32. MWMA and MWMB Unit Wiring Diagram 12.2. M22A Indoor Unit Alarm TO WIRE Motor Remote Output CONTROLLER Control...

  • Page 69: M33A And M33B Indoor Unit

    12.3. M33A and M33B Indoor Unit TO PROGRAMMABLE TO WIRED Alarm Remote WIRED CONTROLLER CONTROLLER Output Control Note: The programmable D IS P LA Y B O A R D wired controller and regular Note1: Remove the JR6 jumper wired controller use the same for remote on /off contr ol wiring connector.

  • Page 70: Mmda Indoor Units

    12.4. MMDA Indoor Units Alarm Remote Output Control CN13 ALA RM ON/OFF CN18 CN15 CN33 CN23 CN13 PUMP TO WIRE DISPLAY CN10 CONTROLLER BOARD INDOOR UNIT MAINBOARD BLACK INDOOR COIL TEMP. SENSOR WHITE ROOM TEMP. SENSOR WATER LEVEL SWITCH YELLOW BLACK BLACK FILT ER- B OA RD...
  • Page 71 Alarm Remote Output Control CN13 Reactor ALARM ON/OFF CN18 CN15 CN33 CN23 CN13 PUMP TO WIRE DISPLAY CN10 CONTROLLER BOARD INDOOR UNIT MAINBOARD BLACK INDOOR COIL TEMP. SENSOR WHITE ROOM TEMP. SENSOR WATER LEVEL SWITCH YELLOW BLACK BLACK FILTER-BOARD C N7 To CCM Comm.Bus TO OUTDOOR UNIT...

  • Page 72: Mcfa And Mcfb Indoor Units

    12.5. MCFA and MCFB Indoor Units • • • • • This symbol indicates the element is INDOOR UNIT MAINBOARD optional,the actual shape shall prevail. Ceiling-Floor Type CN1 5 CN18 DC MOTOR DRIVER MODULE R e a c to r WHITE CN21 BLUE...
  • Page 73 • • • • • This symbol indicates the element is INDOOR UNIT MAINBOARD optional,the actual shape shall prevail. Ceiling-Floor Type CN15 CN18 DC MOTOR DRIVER MODULE Reactor WHITE CN21 BLUE BLACK CN24 VSWING(INACTIVE) SWING DISPLAY TO WIRE CN10A BOARD CONTROLLER BLACK INDOOR COIL TEMP.
  • Page 74 INDOOR UNIT MAINBOARD Ceiling-Floor Type CN18 FAN2 Reactor DC MOTOR CN21 DRIVER M ODULE CN13 CN24 VSWING(INACTIVE) SWING CN13 DC MOTOR DISPLAY TO WIRE CN10A DRIVER MO DULE CONTROLLER BOARD FAN1 BLACK INDOOR COIL TEMP. SENSOR CN29 CN28 WHITE ROOM TEMP. SENSOR CN33 CN23 OUTER PIPE TEMP.

  • Page 75: Control Board Photos

    13. Control Board Photos S1+S2 CCM Address Heating Temperature Compensation Adjustment For Mode Conflict Setting (24k and smaller units only) Indoor Fan Pre-Heat Function Speed Adjustment Adjustment (future version) Auto Restart Function Figure 44. M22A Main Control Image Heating Temperature Compensation S1+S2 Adjustment For Mode Conflict CCM Address Setting (24k and smaller units only) Pre-Heat Function Indoor Fan Adjustment...
  • Page 76 ENC2 For Mode Conflict Setting Set Static Pressure (24k and smaller units only) Indoor Fan Speed Adjustment ENC1 Factory Use Only, Do Not Adjust Heating Temperature Compensation Adjustment Auto Restart Function Pre-Heat Function S1+S2 Adjustment CCM Address Figure 46. MMDA Main Control Image For Mode Conflict Setting (24k and smaller units only) Indoor Fan Speed Adjustment S1+S2 CCM Address Auto Restart Function Heating Temperature Pre-Heat Function Compensation Adjustment...

  • Page 77: Condensate Pipe Work Installation

    Figure 48. MWMA and MWMB Main Control Image S1+S2 CCM Address Figure 49. MWMA and MWMB Receiver Control Image (No Operation Switches on Main Control) 14. Condensate Pipe Work Installation 14.1. Outdoor Unit Condensate Piping Condensate formed during the heating and defrost processes must be drained from heat pump units. Drain holes are provided in the base of the units to ensure proper drainage. Heat pumps must be raised when installed on a concrete pad or the ground to allow drainage to occur. If the heat pump unit is installed on wall mounting brackets, insert the provided drain connector into one of the 1 inch (25 mm) drain holes and attached a field-provided insulated drain hose to the connector.

  • Page 78: Indoor Unit Gravity Drain

    Condensate Drain Drain (location varies per model) Chassis Connector Figure 50. Condensate Drainage Requirement 14.2. Indoor Unit Gravity Drain CAUTION Make sure that drain piping is properly routed and insulated in order to prevent both leaks and condensation. IMPORTANT Drain should have a slope of at least ¼ inch per foot and should be approved corrosion-resistant pipe. You must confirm operation of every drain and pump in the system as part of the commissioning procedure. 1. Make a water-tight connection between the field-provided condensate drain extension and the provided flexible drain piping. 2. Confirm proper slope (not less than 1/4 inch per foot) and routing of condensate lines to ensure moisture is drained away from the indoor unit. 3. Drain should be as short as possible and should not have any droops or kinks that would restrict condensate flow and shall be approved resistant pipe. There must be a 2-inch space between the end of the condensate drain and the final termination point (ground, open drain, etc.) to ensure that the line will drain freely. 4. After the system installation is complete, the condensate drain line must be checked for leaks and proper drainage. If a field-provided condensate pump has been installed, it must be checked to ensure proper operation. This check is part of the commissioning sequence. 3 ft. (1 m) Indoor Unit SUPPORT STRAPS...

  • Page 79: Indoor Unit Lift Pump

    Indoor Indoor Indoor Unit Unit Unit INDIVIDUAL DRAIN OUTLET FROM EACH INDOOR UNIT MAIN DRAIN (Sloped at 1/4” per foot AWAY from unit and should be supported as needed to prevent sagging.) Figure 52. Condensate Drain Multiple Indoor Units Suspended from Ceiling Using a Single Properly Sloped Gravity Drain 14.3.
  • Page 80 STRUCTURAL CEILING 8 in. 3 ft. (1 m) (203 mm) SUSPENSION RODS SUPPORT STRAPS DRAIN LINE Figure 54. Condensate Drain with Pump 5. After system installation is complete, the condensate drain line must be checked for leaks and the condensate pumps must be checked to ensure proper operation.
  • Page 81 NOTE: There must be a 2-inch (51 mm) space between the end of the condensate drain and the final termination point (ground, open drain, etc.) to ensure that the line will drain freely. After system installation is complete, the condensate drain line must be checked for leaks and the condensate pumps must be checked to ensure proper operation. This check is part of the commissioning sequence. Pour water into the evaporator drain pan to ensure proper condensate drainage. See figure right. If a leak is found, shut down power to the unit at once and do not restore power to the unit until the problem has been resolved.

  • Page 82: Controls

    15. Controls 15.1. M0STAT60Q-1 Wireless Remote Furnished with Wall-Mounted Indoor Units, Cassette Indoor Units and Ceiling/Floor Indoor Units. NOTE: Can be ordered separately for ducted indoor units. • Complete remote control of system. Maximum operating range is 25 ft. • Operates on two AAA 1.5V batteries (furnished).
  • Page 83 NOTE: To cancel, push the “ON/OFF”, “SLEEP”, “FP”, “MODE”, “FAN SPEED”, “UP/DOWN” buttons. TIMER ON / TIMER OFF • T IMER ON (initiates an auto-on time sequence) and TIMER OFF (initiates an auto-off time sequence) can be used separately or together. • Each press of the button increases the time in 30 minute increments up to 10 hours. Above 10 hours each press of the button will increase the auto-timed setting by 60 minutes up to 24 hours. NOTE: To cancel, set timer to 0.0 or turn remote off and on. SWING U sed to stop or start horizontal louver auto swing feature. DIRECT •...
  • Page 84 Auto 1. Press the MODE button to select Auto. 2. P ress the UP/DOWN button to set the desired temperature. The temperature can be set within a range of 3. Press the ON/OFF button to start the air conditioner. Cooling /Heating/Fan Mode display AUTO COOL 1. P ress the MODE button to select COOL, HEAT or FAN mode. HEAT 2. P ress the UP/DOWN buttons to set the desired temperature. Displayed when data transmitted. 3.

  • Page 85: M0Stat61Q-1 Wired Remote

    15.2. M0STAT61Q-1 Wired Remote POWER MODE SELECTION TIMER ON ADJUSTMENT UP TIMER FOLLOW TIMER OFF ADJUSTMENT DOWN TIMER FAN SPEED MODE SWING TEMP FOLLOW ME SWING RESET LOCK ECONOMY RESET FAN SPEED SELECTION LOCK Furnished with Ducted Indoor Units. NOTE: Can be ordered separately for non-ducted indoor units.
  • Page 86 UP/DOWN Buttons I ncrease or decrease the indoor temperature in two degree increments (maximum 88°F, minimum 62°F). NOTE: Temperature cannot be adjusted in FAN mode. NOTE: Press and hold and buttons together for 3 seconds to alternate the temperature display between the °C and °F scale. SWING Button U sed to stop or start horizontal louver auto swing feature. ECONOMY Button M aintains the most comfortable temperature and saves energy. RESET Button (Recessed) R esets Controller to factory settings. Recessed to prevent tampering.

  • Page 87: Connection To Centralized Controller

    16. Connection to Centralized Controller 16.1. Set Indoor Unit Address for Centralized Control All indoor units connected to a centralized controller must have a unique address. Use the S1 dip switch and the S2 dial switch to set the address for each indoor unit. The table below shows how to set the unique addresses. All indoor units are factory set to “0”. To change the address to “1”, move the dial switch to the 1 position, do not adjust the dip switches. To change the address to “35”, move dip switch 1 to the UP position and move the dial switch to the 3 position. FOR SETTING ADDRESS S1+S2 0 ~ F 0 ~ F 0 ~ F 0 ~ F RANGE 0 ~ 15 16 ~ 31 32 ~ 47 48 ~ 63 ADDRESS...

  • Page 88: Indoor Unit Connection Points For Centralized Controller

    16.2. Indoor Unit Connection Points for Centralized Controller Mini-split indoor units can be connected to a centralized controller (e.g. Lennox VRF Manager - LVM or Trane Tracer) or a BACnet or Lonworks gateway using the XYE terminals on the indoor unit main board. ( E ) Indoor Unit Connection Points Typical To CCM Comm.Bus Indoor Unit Connection Points Typical Wiring Diagram Figure 60. Connection Points 17. Indoor Unit Connection Points for ON/OFF Device Mini-split indoor units can be connected to an external device such as a fire alarm system using two dry contacts on the indoor unit main board. These dry contacts allow the external device to turn the indoor unit on or off. Figure 61. Indoor Unit Connection Points (Typical)

  • Page 89: Indoor Unit Connection Points For Alarm Device

    18. Indoor Unit Connection Points for Alarm Device Mini-split indoor units can be connected to an alarm device such as a light or buzzer using two dry contacts on the indoor unit main board. Figure 62. Indoor Unit Connection Points (Typical)

  • Page 90: Start-Up

    19. Start-Up 19.1. Adding Refrigerant - Single-Zone Systems The outdoor unit is factory-charged with refrigerant. Calculate the additional refrigerant required according to the diameter and the length of the liquid pipe between the outdoor unit and indoor unit connections. Be sure to add the proper amount of additional refrigerant. Failure to do so may result in reduced performance. NOTE: Interconnecting pipe work between outdoor and indoor units must be 10 ft. or longer. NOTE: Do not remove refrigerant for line lengths less than 25 ft. R-410A is a blended refrigerant. If you must remove charge, it is necessary to remove the entire charge and weigh in the new charge.

  • Page 91: Outdoor Unit Spot Check Function

    19.3. Outdoor Unit Spot Check Function There is a check switch in outdoor PCB. Push the switch SW1 to check the states of unit when the unit is running. The digital display tube will display the follow procedure when push SW1 each time. Figure 63. SW1 Location Table 3. Status Indicators Display Remark Normal Display Display running frequency, running state or malfunction code Actual data Display Number of indoor units Quantity of indoor units in good connection three four five Outdoor unit running mode Off: 0, Fan only: 1, Cooling: 2, Heating: 3, Forced cooling: 4 Indoor unit A capacity Indoor unit B capacity The capacity unit is horse power. If the indoor unit is not connected, the digital display tube will show: “――” Indoor unit C capacity (9K:1HP,12K:1.2HP,18K:1.5HP) Indoor unit D capacity...
  • Page 92 Table 3. Status Indicators Display Remark Indoor unit A capacity demand code Indoor unit B capacity demand code Norm code*HP Indoor unit C capacity demand code (9K:1HP,12K:1.2HP,18K:1.5HP) Indoor unit D capacity demand code Indoor unit E capacity demand code Outdoor unit amendatory capacity demand code Forced cooling:7 The frequency corresponding to the total indoor units amendatory capacity demand The frequency after the frequency limit The frequency sending to compressor control chip Indoor unit A evaporator outlet temp.(T2BA) Indoor unit B evaporator outlet temp.(T2BB) If the temp. is lower than -9 degree, the digital display tube will show “-9”.If the temp. is higher than 70 degree, the digital display tube will show “70”. If the indoor unit is not Indoor unit C evaporator outlet temp.(T2BC) connected, the digital display tube will show: “――”...

  • Page 93: Outdoor Unit Digital Display Tube

    Table 3. Status Indicators Display Remark Indoor unit F capacity demand code Not used Indoor unit F evaporator outlet temp.(T2BF) Not used Indoor unit F room temp.(T1F) Not used Indoor unit F evaporator temp.(T2F) Not used EXV open angle for F indoor unit Not used 19.4. Outdoor Unit Digital Display Tube There is a digital display tube in outdoor PCB. Digital display tube display function Table 4. Operation Display Description In standby , the LED displays “- -” In compressor operation, the LED display the running frequency, In defrosting mode, The LED displays “dF” or alternative displays between running frequency and “dF”(each displays 0.5s) In compressor pre-heating, The LED displays “PH” or alternative displays between running frequency and “PH”(each displays 0.5s) During the oil return process, The LED displays “RO” or alternative displays between running frequency and “RO”(each displays 0.5s) In low ambient cooling mode, the LED displays “LC” or alternative displays between running frequency and “LC”(each displays 0.5s) In forced cooling mode, the LED displays “FC” or alternative displays between running frequency and “FC”(each displays 0.5s) When PFC module protection occurs three times within 15 minutes, the LED displays “E6” or alternative displays between running frequency and “E6”(each displays 0.5s) In protection or malfunction, the LED displays error code or protection code.

  • Page 94: Double-Check Pipe Connections

    19.6.1. Test Run Instructions You should perform the Test Run for at least 30 minutes. 1. Connect power to the unit. 2. Press the ON/OFF button on the remote controller to turn it on. 3. Press the mode button to scroll through the following functions, one at a time: • COOL - Select lowest possible temperature. • HEAT - Select highest possible temperature. 4. Let each function run for 5 minutes, and perform the following checks: 19.6.2. Before Test Run Table 5. Test Run Checklist Checks Pass Fail No electrical leakage Unit is properly grounded All electrical terminals properly covered Indoor and outdoor units are solidly installed All pipe connection points do not leak Water drains properly from drain hose All piping is properly insulated...

  • Page 95: Quick Reference Guide - Error Codes

    20. Quick Reference Guide - Error Codes Table 6. Single-Zone 009/012 115VAC/208-230VAC LED Display (LED 1: Blue) Error Description Slow Flash Standby Normal operation Fast Flash Outdoor unit error. Slow flash -- flashing at 1Hz. Fast flash - flashing at 2Hz. Table 7. Single-Zone 018/030 208-230VAC Main Control IPM Control (comp. driver) Error Description Blue LED Red LED Green LED...
  • Page 96 Table 9. Indoor Unit Fault Codes (09/24) Running Light State of Display Description Short Flashes Timer Light 1 time Indoor unit EEPROM error 2 times Communication error between indoor and outdoor units 4 times Indoor fan speed error 5 times Indoor return air temperature sensor error 6 times Indoor coil temperature sensor error 7 times Low refrigerant 8 times...

  • Page 97: Single-Zone Outdoor Unit Led Locations

    21. Single-Zone Outdoor Unit LED Locations Single-zone outdoor units display flash codes on the main board. The main board is accessed through the top of the unit. Indoor units will display more detailed error codes. See “20. Quick Reference Guide - Error Codes” on page 95 for error codes. These outdoor units do not have a SW1 spot check push button switch. Diagnostic is performed through a series of blue, red and green LEDs. NOTE: The control on all single-zone outdoor units is mounted with all LEDs down and cannot be seen unless the control is removed. Figure 64. Typical Location of Outdoor Unit LEDs...
  • Page 98 C N 21 C N 11 R 38 R 55 KFR 26W $BP2- 180( D YD C - 390- N 3) . D . 13. W P2. 1 C N 12 Figure 66. Typical LED Location - MPA009S4S-1P, MPA012S4S-1P, MPA009S4S-1P and MPA012S4S-1P...
  • Page 99 Ear t h C N 6 C N 6- 1 L- I N [ 1. 0] 2014- 7- 5 C N 22 C N 8 D SA1 C N 21 C N 4 C N 12 R EAC TO R 65T 250V30A FU SE1 R C3...
  • Page 100 C N 20 C N 19 C N 18 C N 21 C N 17 R 60 C 64 C 65 C 72 C 23 FAN _I N R 54 R 53 C 67 C N 42 I C 8 C N 11 I C 7 I C 6...

  • Page 101: Multi-Zone Outdoor Unit Leds And Sw1 Locations

    22. Multi-Zone Outdoor Unit LEDs and SW1 Locations Push the switch SW1 to check the states of the unit when it is operational. The digital display will toggle through he states when SW1 is pressed. Figure 69. Typical Location of LEDs and SW1 - 18K and 30K Multi-Zone Outdoor Units Figure 70. Typical Location of LEDs and SW1 - 36K and 48K Multi-Zone Outdoor Units...

  • Page 102: Troubleshooting Outdoor Unit Error Codes

    23. Troubleshooting Outdoor Unit Error Codes Error Code: Description: Outdoor EEPROM malfunction. General Note: PCB main chip does not receive feedback from EEPROM chip. EEPROM: a read-only memory whose contents can be erased and reprogrammed using a pulsed voltage. For the location of EEPROM chip, please refer to the photo. Outdoor EEPROM malfunction Power off, then restart the unit 3 minutes later. Does the problem still exist? Replace the outdoor main PCB.
  • Page 103 Error Code: Description: Communication malfunction between outdoor unit and all indoor units. General Note: Indoor unit does not receive the communication from outdoor unit for 120 seconds or outdoor unit does not receive the communication from any one indoor unit for 180 seconds. Start: Power off, then Power on the outdoor unit by the Breaker. (reconnect the power wire). Is it still displaying the error code? Check wiring on the outdoor and indoor terminals follow the wiring diagram. Are all Correct the wiring of the connections correct? Reconnect the wiring Measure Vs, is it moving alternately A: Is all the wiring between Turn on all indoor units by the remote between positive value and negative terminals and indoor PCB controller. Are all indoor units displaying value? (Vs is the voltage between 3 connected correctly`? correctly?
  • Page 104 Error Code: E2 (continued) Use a multimeter to test the DC voltage between 2 port and 3 port of outdoor unit. The red pin of multimeter connects with 2 port while the black pin is for 3 port. When unit is normal running, the voltage will move alternately between positive value and negative value. IPM (for 2-zone/3-zone) Power (some Power (some models) modles) Self-Check OK Opera ng Main board LED when power on and unit standby.
  • Page 105 Error Code: E2 (continued) Check point button, press 1 time to check how many indoor units are connected.
  • Page 106 Error Code: Description: Communication error between outdoor unit main control and IPM. General Note: PCB main chip does not receive feedback from IPM during 60 seconds. Communication malfunction between IPM board and outdoor main board. Is there at least one LED in the IPM board light? Check the signal wire between the IPM module and the main board, is it con- nected correctly? Reconnect and retry. Does error still display? Replace IPM board, and then check whether the system operates normally. Replace outdoor main board, and then check whether the system operates normally. Problem Solved. Replace the electric control box.
  • Page 107 Error Code: E3 (continued) NOTE - Use a multimeter to test the DC voltage between black pin and white pin of signal wire The normal value should be around 5V. Use a multimeter to test the DC voltage between black pin and red pin of signal wire. The normal value should be around 12V.
  • Page 108 Error Code: Description: Temp. sensor error - outdoor coil sensor (T3), outdoor ambient sensor (T4), compressor discharge sensor (T5), indoor unit coil outlet temp. sensor (T2) General Note: Error displays if voltage is lower than 0.06V or higher than 4.94V. Check the connections between tempera- Correct the connections ture sensor and PCB. Are the connec- tions good? Check the resistance value of the sensor via Appendix 1 and Appendix 2. Replace indoor or out- Is it normal? door PCB. Replace the sensor.
  • Page 109 Error Code: Description: High or low voltage protection General Note: An abnormal voltage rise or drop is detected by checking the specified voltage detection circuit. Voltage protection Check the voltage of outdoor unit power supply, the voltage between Check the primary power supply. L1 and L2 range min. 187~ 253VAC max. Check whether the voltage of IPM board P and N is normal? 277-356VDC for 18-30KBtu/h; 277-410VDC for 36KBtu/h. Replace bridge rectifiers, and then check whether the system operates normally. (Only for 4-zone MPA036 & MLA036 units) Replace IPM board, and then check for normal unit operation. Replace outdoor main board. Problem Solved.
  • Page 110 Error Code: E5 (continued) IPM (for 2-zone and 3-zone) IPM (for 4-zone) P-N (for 2-zone and 3-zone)
  • Page 111 Error Code: E5 (continued) P-N (for 4-zone) Bridge rectifier for 2-zone and 3-zone Bridge rectifier for 4-zone...
  • Page 112 Error Code: E5 (continued) Remark: Measure the DC voltage between + and - port. The normal value should be 190V~250V. Error Code: Description: PFC module protection. (For MPA036S4M-1P and MPA048S4M-1P) General Note: When the voltage signal that PFC sends to main control board is abnormal, the display LED will show “E6” and unit will turn off. PFC module protection Check that the connecting wiring between main Correct faulty connections, then board and the PFC module is con- check proper unit operation nected tightly. Check the voltage range between P-N on IPM module is normal? 277- Replace the outdoor main board. 356VDC for 18-30KBtu/h; 277- 410VDC for 36KBtu/h. Check if the inductance of the PFC Replace the inductor.
  • Page 113 Error Code: E6 (continued) Inductor Two terminals of the inductor...
  • Page 114 Error Code: Description: Outdoor DC fan motor speed error. General Note: When outdoor fan speed is too low (300RPM) or too high(2400RPM) for a certain time, the unit will stop and the LED will display the failure. Power off, then restart the unit 3 minutes The unit operates normally. later. Is it still displaying the error code? Shut off the power supply, and inspect all components for damage. Rotate the fan Make necessary corrections by hand, the Fan should offer little resis- tance when manually spun. Wheel and shaft should spin evenly and balanced. Check all wiring connections. Correct faulty corrections. Check main PCB, see index 1. Replace the main PCB. Replace the fan motor.
  • Page 115 Error Code: E8 (continued) DC fan motor(control chip is inside fan motor) Power on and while the unit is in standby, measure the voltage between pin1-pin3, pin4-pin3 at fan motor connector. If the value of the voltage is not in the range shown in below table, the PCB faulty and should be replaced. Table 11. DC Motor Voltage Input and Output Color Signal Voltage Vs/Vm 200~380V Black White 13.5~16.5V Yellow 0~6.5V Blue 13.5~16.5V...
  • Page 116 Error Code: F1, F2, F3, F4 , F5 and F6 Description: Indoor unit #1, #2, #3, #4 , #5 or #6 coil outlet temp. sensor error General Note: If the sampling voltage is not 5V, the LED will display the failure. Check the connections between tempera- Correct the connections ture sensor and PCB. Are the connec- tions good? Check the resistance value of the sensor via Appendix 1 and Appendix 2. Replace indoor or out- Is it normal? door PCB. Replace the sensor.
  • Page 117 Error Code: Description: High pressure switch open. General Note: If the sampling voltage is not 5V, the LED will display the failure. High Pressure Protection Check wiring connections between high pres- Make necessary corrections. sure switch and main PCB. Determine if High pressure switch is faulty. Method: Disconnect the plug. Measure the Replace high pressure protection resistance of the high pressure protector, if the switch. protector is normal the value is 0. Check the outdoor ambient temperature. The Stop the unit. outdoor ambient temperature should not be higher than 50 °C or 122 °F. Make corrections to allow for proper Check if the outdoor unit ventilation is good ventilation See Error code E8 to properly diag- Check if the outdoor fan runs properly nose outdoor fan motor. Check outdoor coils. The outdoor unit coils Clean outdoor coils. should be clean and free of any debris.
  • Page 118 Error Code: P1 (continued)
  • Page 119 Error Code: Description: Low pressure switch open. General Note: If the sampling voltage is not 5V, the LED will display the failure. Low Pressure Connection Refrigerant is not enough. Add the refrigerant. Is the wiring between the low pressure switch and Connect it properly.. main control board is connected properly. Is the low pressure protector broken? Method: Disconnect the plug. Measure the resistance of the low pressure protector, if the protector is normal Replace low pressure protector. the value is 0. Check whether the outdoor ambient temperature is to Stop the unit. low. Check whether the high pressure valve is opened. Fully open the high pressure valve. Refer to the solution of fan speed mal- function (E8). Find out the cause correct Check if the indoor fan runs properly in cooling mode. Replace outdoor main board.
  • Page 120 Error Code: P2 (continued)
  • Page 121 Error Code: Description: Outdoor compressor current overload sensed General Note: If the outdoor current exceeds the current limit value, the LED will display the failure. Current protection of compressor. Check whether the input current of the power Replace outdoor main board. supply should not exceed more than 12A for 18K BTU units. For 30K, 18.5A. For 36K, it is 23A. Check whether the refrigerant system is OK. Check whether the outdoor ambient temperature Stop the unit. is higher than 50°C or 122 F Correct poor ventilation to outdoor unit. Check if outdoor unit has proper ventilation. Check outdoor coils. Outdoor coils should be clean Clean outdoor coils. and free of any debris. Recover refrigerant and remove restriction(s). Perform proper vacuum procedures, then Judge 5: The refrigerant pipe is blocked. restart system.
  • Page 122 Error Code: P3 (continued)
  • Page 123 Error Code: Description: High temperature sensed at compressor discharge line. General Note: When the compressor discharge temperature(T5) is more than 239°F (115°C) for 10 seconds, the compressor will stop and restart till T5 is less than 194°F (90°C). Temperature protection of compressor. Check whether the compressor discharge temp. is Check whether the Stop leaking and add more than 239°F (115°C) ? refrigerant is leak. refrigerant. Check whether the connection is right between com- pressor discharge temp. sensor and PCB according to Correct the wiring connection. wiring diagrams? Measure the resistance value of compressor dis- Replace the compressor charge temp. sensor. If the value is not normal is discharge temp. sensor. normal refer to the Appendix 2? Replace outdoor main PCB. Replace high pressure valve assy.
  • Page 124 Error Code: Description: High temperature sensed at outdoor coil. General Note: When outdoor pipe temperature is more than 149°F (65°C), the unit will stop, and unit runs again when outdoor pipe temperature is less than 125.6°F (52°C). High temperature protection of Is the connection be- condenser Repair/replace wiring as tween the temperature per wiring diagram. sensor and the PCB correct? Check whether the compressor temperature is higher than 149°F Check the resistance (65°C) ? Replace the temperature value of the outdoor sensor. temperature sensor is correct. Refer to table Appendix 1. Switch unit off until ambient tem- Check whether the outdoor ambi- perature is within normal operating ent temperature is higher than parameters. 122°F (50°C). Remove obstruction or increase Is there sufficient airflow across ventilation path/airflow. outdoor unit coils? Are the outdoor unit fans operat- Refer to the fault code fan speed ing correctly? malfunction (E8).
  • Page 125 Error Code: Description: Inverter module (IPM) error. General Note: When the voltage signal that IPM sends to the compressor drive chip is abnormal, the display LED will show “P6” and unit will turn off. Check whether the Correct the incoming Check whether the voltage range input power supply is power problem, then of P-N on IPM module is normal? check whether the sys- 277-356VDC for 18-30KBtu/h;...

  • Page 126: Indoor Unit Indicators And Controls

    24. Indoor Unit Indicators and Controls For a list of applicable error codes for the indoor units, refer to “20. Quick Reference Guide - Error Codes” on page 95. All indoor units provide error code information with either a digital LED display or with flash codes. 24.1. Cassette Unit Display PRE-DEF indicator(cooling and heating type) or fan only indicator(cooling only type) Alarm indicator Timer indicator Infrared signal receiver Operation lamp Display digital tube Temporary button MANUAL OPERATION TIMER DEF./FAN ALARM Figure 71.

  • Page 127: Wall-Mounted And Ceiling/Floor Unit Displays

    24.3. Wall-Mounted and Ceiling/Floor Unit Displays ION indication lamp (optional function): This lamp illuminates when clean air feature is activated. Defrost Indication Lamp (for cooling and heating models only): Lights up when the air conditioner starts defrosting automatically or when the warm air controls feature is activated in heating operation. Operation Indication Lamp: This lamp illuminates when the air conditioner is in operation. Timer Indication Lamp: Lights up during timer operation. Temperature Indicator: Displays the temperature settings when the air conditioner is operational. Also displays error codes. Figure 73. Wall-Mounted Unit Display...

  • Page 128: Troubleshooting Indoor Unit Error Codes

    25. Troubleshooting Indoor Unit Error Codes Error Code: Description: MWMA models only. General Note: None. The unit will show “CP” if the cap Adapter board missing or not making contact. located on door Adapter board of MWMA unit Need to make sure the two pin to making contact with the jumper.
  • Page 129 Error Code: Description: Communication malfunction between indoor unit and outdoor unit. General Note: PCB main chip does not receive feedback from IPM module during 60 seconds. Communication malfunction between IPM board and outdoor main board. Is there at least one LED in the IPM board light? Check the signal wire between the IPM module and the main board, is it con- nected good? Reconnect and retry. Is error still display? Replace IPM board, and then check whether the system can run normally. Replace outdoor main board, and then check whether the system can run nor- mally. Problem Solved. Replace the electric control box.
  • Page 130 Error Code: E1 (continued) NOTE - Use a multimeter to test the DC voltage between black pin and white pin of signal wire The normal value should be around 5V. Use a multimeter to test the DC voltage between black pin and red pin of signal wire. The normal value should be around 12V.
  • Page 131 Error Code: Description: Indoor fan speed error. General Note: When indoor fan speed runs too low (300RPM) for a certain time, the unit will stop and the LED will display the error. Indoor fan speed error Power off, then restart the unit 2 minutes The unit operates later. Does error still display? normally. Shut off power supply and rotate fan by Remove obstruction. hand. Does fan spin freely? 1. Indoor DC fan motor (Control Chip is in Fan Motor) 2. Turn power on and while the unit is on standby, measure the voltage between pin1 and pin3 as well as between pin4 and pin3 in fan motor Check the wiring of the fan motor. Is it connector. If the value of the voltage is not within...
  • Page 132 Error Code: Description: Indoor return air temperature sensor error. General Note: If the voltage is lower than 0.06V or higher than 4.94V, the LED will display the error. Temperature sensor error Check the connections between tempera- ture sensor and PCB. Are the connec- Correct the connections tions good? Check the resistance value of the sensor via Appendix 1 and Appendix 2. Replace indoor or out- Is it normal? door PCB. Replace the sensor.
  • Page 133 Error Code: Description: Indoor Coil Temperature Sensor Error General Note: If the voltage is lower than 0.06V or higher than 4.94V, the LED will display the error. Check the connections between tempera- Correct the connections ture sensor and PCB. Are the connec- tions good? Check the resistance value of the sensor via Appendix 1 and Appendix 2. Replace indoor or out- Is it normal? door PCB. Replace the sensor.
  • Page 134 Error Code: Description: Low Refrigerant Error General Note: The system monitors the value of evaporator coil sensor T2 for the first 5 minutes after startup. If the temperature of T2 drops per this formula three times in the first 5 minutes of operation, the system shuts down and the error code displays. For this formula “Tcool” = the T2 temperature at startup. T2 < Tcool - 3.6°F (2°C) Power off then restart the unit in 2 min- utes. Check the T2 sensor. Is Check to see if cool air is blowing out of it functioning the indoor air outlet Replace the indoor PCB Check for refrigerant leaks. Repair leaks and re- charge system. Check for restriction in refrigerant lines. Clear restriction.
  • Page 135 Error Code: Description: Water-level alarm malfunction. (For M22A, M33A/B and MMDA units) General Note: If the sampling voltage is not 5V, the LED will display the failure. Power off, then restart the unit 3 minutes later. Is it still displaying the error code? Insert the water-level If the water-level switch is inserted well? switch well. Replace the water-level If the water-level switch is broken? switch. Replace the water pump, If malfunction is still not solved. Replace the indoor main PCB.
  • Page 136 Error Code: Description: Outdoor compressor current overload sensed General Note: If the outdoor current exceeds the current limit value, the LED will display the failure. Check whether the input current of the power Replace outdoor main board. supply should not exceed more than 12A for 18K BTU units. For 30K, 18.5A. For 36K, it is 23A Check whether the refrigerant system is OK. Check whether the outdoor ambient temperature Stop the unit. is higher than 50°C or 122 F Correct poor ventilation to outdoor unit. Check if outdoor unit has proper ventilation. Check outdoor coils. Outdoor coils should be clean Clean outdoor coils. and free of any debris. Recover refrigerant and remove restriction(s). Perform proper vacuum procedures, then Judge 5: The refrigerant pipe is blocked. restart system. Replace outdoor main board, and check whether the system can run normally. Replace the electric control box.
  • Page 137 Error Code: Description: Outdoor Temperature Sensor T4 Error. General Note: If the voltage is lower than 0.06V or higher than 4.94V, the LED will display the error. Check the connections between tempera- Correct the connections ture sensor and PCB. Are the connec- tions good? Check the resistance value of the sensor via Appendix 1 and Appendix 2. Replace indoor or out- Is it normal? door PCB. Replace the sensor.
  • Page 138 Error Code: Description: Faulty Outdoor Coil Temperature Sensor T3/T5. General Note: If the voltage is lower than 0.06V or higher than 4.94V, the LED will display the error. Check the connections between tempera- Correct the connections ture sensor and PCB. Are the connec- tions good? Check the resistance value of the sensor via Appendix 1 and Appendix 2. Replace indoor or out- Is it normal? door PCB. Replace the sensor.
  • Page 139 Error Code: Description: Compressor discharge temperature sensor error General Note: When the compressor discharge temperature(T5) is more than 115°C for 10 seconds, the compressor will stop and restart till T5 is less than 90°C. Temperature protection of compressor. Check whether the compressor discharge temp. is Check whether the Stop leaking and add more than 115°C ? refrigerant is leak. refrigerant. Check whether the connection is right between com- Correct the wiring con- pressor discharge temp. sensor and PCB according to nection. wiring diagrams? Measure the resistance value of compressor dis- Replace the compressor charge temp. sensor. If the value is not normal is discharge temp. sensor. normal refer to the Appendix 2? Replace outdoor main PCB. Replace high pressure valve assy.
  • Page 140 Error Code: Description: Outdoor EEPROM error. General Note: PCB main chip does not receive feedback from EEPROM chip. EEPROM: a read-only memory whose contents can be erased and reprogrammed using a pulsed voltage. For the location of EEPROM chip, please refer to the below photos. Outdoor EEPROM malfunction Power off, then restart the unit 3 minutes later. Does the problem still exist? Replace the outdoor main PCB. Outdoor PCB(M3OC-30HRFN1-M)
  • Page 141 Error Code: Description: Outdoor unit fan speed error General Note: When outdoor fan speed keeps too low (300RPM) or too high(2400RPM) for certain time, the unit will stop and the LED will display the failure. Outdoor fan speed malfunction Power off, then restart the unit 3 minutes The unit operates normally. later. Is it still displaying the error code? Shut off the power supply, and inspect all components for damage. Rotate the fan Make necessary corrections by hand, the Fan should offer little resis- tance when manually spun. Wheel and shaft should spin evenly and balanced. Check all wiring connections. Correct faulty corrections. Check main PCB, see index 1. Replace the main PCB. Replace the fan motor.
  • Page 142 Error Code: Description: Indoor Unit Evaporator Outlet Coil Temperature Sensor Faulty General Note: If the voltage is lower than 0.06V or higher than 4.94V, the LED will display the error. Temperature sensor error Check the connections between tempera- Correct the connections ture sensor and PCB. Are the connec- tions good? Check the resistance value of the sensor via Appendix 1 and Appendix 2. Replace indoor or out- Is it normal? door PCB. Replace the sensor.
  • Page 143 Error Code: Description: IPM module or IGBT over current protection. General Note: When the voltage signal that IPM sends to the compressor drive chip is abnormal, the display LED will show “P6” and unit will turn off. Correct the incom- Check whether Check whether the voltage range ing power problem, the input power of P-N on IPM module is normal? then check whether supply is cor- the system operates 277-356VDC for 18-30KBtu/h; 277- rect? 208-230V, 410VDC for 36KBtu/h normally 1PH, 60Hz Check whether the Check whether the connecting wiring Connect it tightly, Connect it correctly power supply line between main board and the IPM unit operates and tightly, check is connected cor- module is connected tightly. correctly? ok or not? rectly and tightly.
  • Page 144 Error Code: P0 (continued)
  • Page 146 Error Code: Description: High or Low voltage protection General Note: An abnormal voltage rise or drop is detected by checking the specified voltage detection circuit. Voltage protection Check the voltage of outdoor unit power supply, the voltage between Check the primary power supply. L(L1) and N (L2) range min. 187~ max 253VAC Check whether the voltage of IPM board P and N is normal? 277-356VDC for 18-30KBtu/h; 277-410VDC for 36KBtu/h. Replace bridge rectifiers, and then check whether the system can run normally(Only for 4-zone) Replace IPM board, and then check for normal unit operation Replace outdoor main board. Problem Solved.
  • Page 147 Error Code: Description: Compressor top high temperature protection (OLP) General Note: If the sampling voltage is not 5V, the LED will display the P2 error code. Check the air flow system of indoor and outdoor units. Clear air flow blockage. Does a problem exist? Power off the unit and wait 10 minutes before restarting. Check compressor Check the overload Ensure a proper connection. temperature. Is it within protector. Is it properly wired? acceptable parameters? Measure the resistance Replace the OLP. between the two ports of the OLP. Is it zero? Replace the outdoor control PCB. Error Code: Description: Outdoor unit low temperature lockout. General Note: The outdoor unit will lockout if when in heating mode, when the outdoor temperature is lower than -13°F (-25°C) for 1 hour, the indoor unit display error code.
  • Page 148 Error Code: Description: Compressor drive error General Note: An abnormal inverter compressor drive is detected by a special detection circuit, including communication signal detection, voltage detection, compressor rotation speed signal detection and etc Compressor Drive Error Check wiring connections between compressor and Make necessary corrections. main PCB. Replace the IPM board or replace the Check the IPM main PCB. Refer to the error code fan speed mal- Check the outdoor fan and the outdoor unit ventilation.
  • Page 149 Error Code: Description: Compressor high-pressure or low-pressure switch open General Note: If the sampling voltage of pressure switch is not 5V, the LED will display the failure. Test each pressure switch separately following these flow charts. Check wiring connections between high pressure Make necessary corrections. switch and main PCB. Determine if High pressure switch is faulty. Method: Disconnect the plug. Measure the resistance of the high pressure protector, if the protector is normal Replace high pressure protection switch. the value is 0. Check the outdoor ambient temperature. The outdoor Stop the unit. ambient temperature should not be higher than 50 °C or 122 °F. Make corrections to allow for proper Check if the outdoor unit ventilation is good ventilation See Fault code E8 to properly diagnose Check if the outdoor fan runs properly outdoor fan motor. Check outdoor coils. The outdoor unit coils should be Clean outdoor coils. clean and free of any debris. Replace outdoor main board. Check whether the refrigerant system is OK.
  • Page 150 Error Code: P6 (continued) Low Pressure Connection Refrigerant is not enough. Add the refrigerant. Is the wiring between the low pressure switch and Connect it properly.. main control board is connected properly. Is the low pressure protector broken? Method: Disconnect the plug. Measure the resistance of the low pressure protector, if the protector is normal Replace low pressure protector. the value is 0. Check whether the outdoor ambient temperature is to Stop the unit. low. Check whether the high pressure valve is opened. Fully open the high pressure valve. Refer to the solution of fan speed mal- function (E8). Find out the cause correct Check if the indoor fan runs properly in cooling mode. Replace outdoor main board.
  • Page 151 Error Code: P6 (continued)

  • Page 152: Temperature Sensor Resistance Values

    26. Temperature Sensor Resistance Values Table 12. Temperature Sensor Resistance Value Table (°F/°C--K) °F °C K Ohm °F °C K Ohm °F °C K Ohm °F °C K Ohm 115.266 12.6431 2.35774 0.62973 -2.2 108.146 69.8 12.0561 141.8 2.27249 213.8 0.61148 -0.4 101.517...

  • Page 153: Discharge Temperature Sensor Resistance Values

    27. Discharge Temperature Sensor Resistance Values Table 13. Discharge Temperature Sensor Table (°C--K) °F °C K Ohm °F °C K Ohm °F °C K Ohm °F °C K Ohm 542.7 68.66 13.59 3.702 -2.2 511.9 69.8 65.62 141.8 13.11 213.8 3.595 -0.4 455.9...

  • Page 154: Temperature Sensor Identification Table

    Blue - Red Blue - Black Red - Blue MPA012S4S-1L ASM108D1UFZA 1.81Ω (20°C /68°F) MPA012S4S-1P MPB009S4S-1L ASM98D32UFZ 2.25 Ω (20°C /68°F) MPB012S4S-1L MPB009S4S-1P ASN98D22UFZ 1.57 Ω (20°C /68°F) MPB012S4S-1P ASN98D22UFZ 2.25 Ω (20°C /68°F) MPA009S4S-1L ASM98D1UFZA 1.81Ω (20°C /68°F) MPA009S4S-1P MPA018S4S-1P ASM135D23UFZ 1.75Ω (20°C /68°F) MPB018S4S-1P ASM135D23UFZ 1.65 Ω (20°C /68°F) MPA024S4S-1P DA250S2C-30MT 0.55Ω (20°C /68°F) MPB024S4S-1P ATF235D22UMT 0.75 Ω (20°C /68°F) MPA030S4S-1P TNB306FPGMC-L 0.53Ω (20°C /68°F)

  • Page 155: Ipm Check

    Table 15. Model / Compressor Cross-Reference ODU Model # Compressor Model # Blue - Red Blue - Black Red - Blue MLA018S4S-1P ATF235D22UMT 0.75 Ω MLA024S4S-1P MLA018S4M-1P ATF235D22UMT 0.75 Ω MLA030S4M-1P ATF310D43UMT 0.65 Ω MLA036S4M-1P ATQ360D1UMU 0.37 Ω 29.2. IPM Check Measure the resistance value of each winding by using the tester. Turn off the power, let the large capacity electrolytic capacitors discharge completely, and dismount the IPM. Use a digital tester to measure the resistance between P and UVWN; UVW and N. Table 16.

  • Page 156: Ac Fan Motor

    29.3. AC Fan Motor Measure the resistance value of each winding by using the tester Figure 76. Terminals Table 17. Resistance Value Resistance Value Position RPG20B RPG28H 381Ω±8% (20°C) 342Ω±8% (20°C) 183.6Ω±8% (20°C) 180Ω±8% (20°C) Black - Red (Brand: Weiling) (Brand: Dayang) (Brand: Weiling) (Brand: Wolong) 267Ω±8% (20°C) 253Ω±8% (20°C) 206Ω±8% (20°C) 190Ω±8% (20°C) White - Black (Brand: Weiling) (Brand: Dayang) (Brand: Weiling) (Brand: Wolong) Measure the resistance value of each winding by using the tester Figure 77. Terminals Table 18. Resistance Value Resistance Value Position YDK70-6FB...

  • Page 157: Four-Way Valve

    29.4. Four-Way Valve a. Power on, use a digital tester to measure the voltage, when the unit operates in cooling, it is 0V. When the unit operates in heating, it is about 230VAC. If the value of the voltage is not in the range, the PCB must have problems and needs to be replaced. Figure 78. Measure Voltage b. Turn off the power, use a digital tester to measure the resistance. The value should be 1.8~2.5 KΩ. Figure 79. Measure Resistance...

  • Page 158: Exv Check

    29.5. EXV Check Disconnect the connectors. Figure 80. Connector Pin-Out Table 19. Resistance Color of lead wire Normal Value Red- Blue Red - Yellow About 50Ω Brown-Orange Brown-White Figure 81. Connector Pin-Out...

  • Page 159: Component Protection

    Brown-Orange Red- Blue Brown-White Red - Yellow Figure 82. Connector Pin-Out 30. Component Protection 30.1. Fan Motor Fan Speed is out of control (DC fan motor - When outdoor fan speed is lower than 300 RPM or higher than 24000 RPM for 60 seconds, the whole unit stops and LED displays failure. 30.2. Inverter Module Protection Inverter module protection itself has a protection function against current, voltage and temperature, If these protections happened, the corresponding code will display on indoor unit LED and A/C will stop. The unit will recover three minute delay after the protection disappeared.

  • Page 160: Specifications And Operations

    31. Specifications and Operations Table 20. Electronic Functions Abbreviations Indoor ambient temperature Coil temperature of indoor heat exchanger Coil temperature of indoor heat exchanger outlet. (located in outdoor unit) Pipe temperature of outdoor heat exchanger Outdoor ambient temperature Compressor discharge temperature Table 21. Electronic Control Working Environment Input voltage: 230V Input power frequency: 60Hz Indoor fan normal working amp. is less than 1A Outdoor fan normal working amp is less than 1.5A Four-way valve normal working amp is less than 1A Table 22. Main Protection Three minutes delay at restart for compressor One minute delay for the first time start-up and three minutes delay for others Temperature protection of compressor discharge When the compressor discharge is getting higher, the running frequency will be limited as below rules: If 215.6°F (102°C) < T5 < 244.4°F (115°C), decrease the frequency to the lower level every two minutes until to F1. If T5 < 244.4°F (115°C) for ten seconds, the compressor will stop and restart till T5 < 194°F (90°C) Table 23. Indoor/Outdoor Units Communication Protection If the indoor units cannot receive the feedback signal from the outdoor units for two minutes, the unit will stop and display failure.

  • Page 161: Capacity Request Calculations

    31.1. Capacity Request Calculations Total capacity Request=Σ(Norm code × HP) /10× modify rate+ correction. T1 Ts Figure 83. Cooling Mode Capacity Area Norm Code (N) Model NOTE: The final result is integer. Plus all the indoor capacity request together, then modify it by T4. When there is only one indoor unit: Outdoor Temperature (T4) >29°C 18°C to 29°C <17°C Cooling >84.2°F 64.4°F to 84.2°F <62.6°F Modify Rate 100% When there is more than one indoor unit: Outdoor Temperature (T4) >25°C 17°C - 25°C <17°C Cooling >77°F 62.6°F - 77°F...

  • Page 162: Heating Mode

    T4LimFre5_ADD T4LimFre4_ADD T4LimFre3_ADD T4LimFre2_ADD T4LimFre1_ADD No limit Figure 84. Heating Mode Heating Mode Plus all the indoor capacity request together, then multiply it by T4. When there is only one indoor unit: T1 Ts Capacity Area Norm Code (N) Model Outdoor Temperature (T4) <0°C <12°C 12°C to 17°C ≥17°C Heating <32°F <53.6°F 53.6°F to 77°F ≥62.6°F Modify Rate 120% When there more than one indoor unit: Outdoor Temperature (T4) <0°C <12°C 12°C to 17°C ≥17°C Heating <32°F...

  • Page 163: Defrost Control

    NOTE: Average value of T2: Sum T2 value of all indoor units)/ (indoor units number). According to the final capacity request to confirm the operating frequency, as following table. Heating capacity improved in low ambient heating. In heating mode, when T2<T2_ExitT4LowFre_ADD , and T4<-4°C, there is frequency elevation: elevated frequency= Recent frequency * 110% When T2> T2_ExitT4LowFre_ADD-2 and T4>-6, the highest frequency can’t exceed F17 When T2> T2_ExitT4LowFre_ADD-4 and T4>-8, the highest frequency can’t exceed F18...

  • Page 164: Defrost Termination

    Compressor 4-Way valve Outdoor fan 31.4. Defrost Termination Defrost will terminate if: T2 is greater than 64.4°F. T3 is between 64.4°F and 43.4°F for 80 seconds. System has been in defrost for 10 minutes. Run-time count starts After 29 min- utes of run-time T3 time T3 < 19.4°F mea- and T3+5.4°F is sured After 40 minutes of run-time still less than or and T3 T3 <...

  • Page 165: Four-Way Valve Control

    When low ambient cooling is valid: High low ambient cooling Outdoor fan speed control logical (low ambient cooling). When T4 <15°C (59°F) and T3 < 30°C (86°F), the unit will enter into low ambient cooling mode. The outdoor fan will choose speed according to T3. When T3≥38°C (100.4°F) or when T4≥20°C (68°F), the outdoor fan will choose the speed according to T4 again. Exit low ambient cooling mode run with high fan for 1 minute 31.5.2. Heating Mode Normally the system will choose the running fan speed according to ambient temperature: DC_FAN_SSLOW_SPD_ADD 21℃ 19℃ DC_FAN_SLOW_SPD_ADD 18℃ 16℃ DC_FAN_MIN_SPD_ADD 15℃ 13℃ DC_FAN_MID_SPD_ADD 12℃ 10℃ DC_FAN_HI_SPD_ADD 31.6. Four-Way Valve Control In heating mode, four-way valve is opened. In defrosting, four-way valve operates in according to defrosting action. In other modes, four-way valve is closed. When the heating mode to other modes, the four-way valve is off after compressor is off for 2 minutes. Failure or protection (not including discharge temperature protection, high and low pressure protection), four-...

  • Page 166: Electronic Expansion Valve (Exv) Control

    31.7. Electronic Expansion Valve (EXV) Control a. EXV will be fully closed when turning on the power. Then EXV will be standby with 350P open and will open to target angle after compressor starts. b. EXV will close with -160P when compressor stops. Then EXV will be standby with 350P open and will open to target angle after compressor starts. c. The action priority of the EXVs is A-B-C-D. d. Compressor and outdoor fan start operation only after EXV is initialized. 31.7.1. Cooling mode The initial open angle of EXV is 250P, adjustment range is 100-350p. When the unit start to work for 3 minutes, the outdoor will receive indoor units( of capacity demand) T2B information and calculate the average of them. After comparing each indoor’s T2B with the average, the outdoor gives the following modification commands: If the T2B>average, the relevant valve needs more 16p open; If the T2B= average, the relevant valve’s open range remains; If the T2B<average, the relevant valve needs more 16p close. This modification will be carried out every 2 minutes. 31.7.2. Heating mode The initial open angle of EXV is 250P, adjustment range is 100-350p. When the unit start to work for 3 minutes, the outdoor will receive indoor units (of capacity demand) T2 information and calculat From Subject Received Size Categories...

  • Page 167: Index

    32. Index Defrost Therory 163 Dimensions AC Fan Motor 156 M22A Indoor Unit 21 Adding Refrigerant M33A and M33B Indoor Unit 22 Multi-Zone System 90 MCFA and MCFB Indoor Units 33 Single Zone System 90 MMDA Indoor Unit 28 Alarm Device 89 Multi-Zone Outdoor Units 17 MWMA and MWMB Indoor Units 31 Single-Zone Outdoor Units 16 Blower Data - MMDA Indoor Units 25 Discharge Temperature Sensor Resistance Values 153 Display Tube - Outdoor Unit 93 Dry Mode Operation Cassette Unit Display 126...
  • Page 168 Temperature Sensor Error 108 Multi-Zone Outdoor Units 101 Single Zone Outdoor Unit 97 Temperature Sensor ID Table 154 Lift Pump 79 Temperature Sensor Resistance Values 152 Line Sets Temperature Sensor T4 Error - Outdoor Unit 137 MPA and MPB Single Zone Units 41 Troubleshooting Multi-Zone Piping Limitations 44 Outdoor Unit 102 Single Zone Piping Limitations 44 Low Pressure Switch Open 119 Valve - EXV 158 Low Refrigerant 134 Valve - Four-Way 157 Master Valves...

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