Panasonic CS-MKS12NKU, CU-3KS19NBU, CU-4KS24NBU service manual

IMPORTANT

These air conditioners employ new

refrigerant R410A.

Pay special attention when

servicing the unit.

Wall mounted type

CS-MKS7NKU

CS-MKS9NKU

CS-MKS12NKU

CS-MKS18NKU

CS-MKS24NKU

< Applicable Indoor Units >

TECHNICAL & SERVICE MANUAL

OUTDOOR UNIT : CU-3KS19NBU

CU-4KS24NBU

CU-4KS31NBU

DC INVERTER MULTI-SYSTEM AIR CONDITIONER

Product Code No.

1 852 361 24

1 852 361 25

1 852 361 26

REFERENCE NO. SM700877

Capacity at 230V

19,700 BTU/h

25,400 BTU/h

30,600 BTU/h

Outdoor Model No.

CU-3KS19NBU

CU-4KS24NBU

CU-4KS31NBU

CU-3KS19NBU

CU-4KS24NBU

CU-4KS31NBU

Semi-concealed type

CS-MKS9NB4U & CZ-18BT1U

CS-MKS12NB4U & CZ-18BT1U

CS-KS18NB4UW & CZ-18BT1U

Contents

Main IMPORTANT TECHNICAL & SERVICE MANUAL OUTDOOR UNIT : CU-3KS19NBU CU-4KS24NBU CU-4KS31NBU CU-4KS31NBU DC INVERTER MULTI-SYSTEM AIR CONDITIONER CU-3KS19NBU SAFETY PRECAUTIONS Warning Caution Table of Contents Page APPLICABLE INDOOR UNITS Wall Mounted Type Semi-Concealed Type 1. OPERATING RANGE 2. SPECIFICATIONS 2-1. Unit Specifications Indoor Unit CS-MKS9NKU 2 Outdoor Unit CU-3KS19NBU Indoor Unit CS-MKS9NKU 3 Indoor Unit CS-MKS9NKU 3< 208V > Indoor Unit CS-MKS7NKU + CS-MKS9NKU 2 Indoor Unit CS-MKS9NKU 3< 230V > Indoor Unit CS-MKS9NKU 3< 208V > Indoor Unit CS-MKS7NKU 3 + CS-MKS9NKU Indoor Unit CS-MKS9NKU 4< 230V > Indoor Unit CS-MKS9NKU 4< 208V > 2-2-1. Outdoor Unit 2-2. Major Component Specifications Page Page 2-3. Other Component Specifications ID:23/32 2-ID:15/16 3. DIMENSIONAL DATA Outdoor Unit CU-3KS19NBU (852-0-0010-11500-0) ID:23/32 2-ID:15/16 Outdoor Unit CU-4KS24NBU (852-0-0010-20500-0) ID:23/32 2-ID:15/16 Outdoor Unit CU-4KS31NBU (852-0-0010-20600-0) 4. REFRIGERANT FLOW DIAGRAM 4-1. Refrigerant Flow Diagram Outdoor Unit CU-3KS19NBU Outdoor Unit CU-4KS24NBU Outdoor Unit CU-4KS31NBU Outdoor Unit CU-3KS19NBU Indoor Unit CS-MKS7NKU 1 5-1-1. Temperature Charts (CU-3KS19NBU) 5. PERFORMANCE DATA 5-1. Temperature Charts Indoor air temp. 86F (30C) 80F (27C) 75F (24C) Indoor air temp. 86F (30C) 80F (27C) 75F (24C) Indoor air temp. 86F (30C) 80F (27C) 75F (24C) Outdoor Unit CU-3KS19NBU Indoor Unit CS-MKS9NKU 1 Indoor air temp. 86F (30C) 80F (27C) 75F (24C) Indoor air temp. 86F (30C) 80F (27C) 75F (24C) Indoor air temp. 86F (30C) 75F (24C) Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) (In this case, be sure to stop all the indoor units where performance is not being checked.) Indoor air temp. 86F (30C) 80F (27C) Outdoor Unit CU-3KS19NBU Indoor Unit CS-MKS18NKU 1 Indoor air temp. 86F (30C) 80F (27C) 75F (24C) Indoor air temp. 86F (30C) Outdoor Unit CU-3KS19NBU Indoor Unit CS-MKS9NB4U 1 Outdoor Unit CU-3KS19NBU Indoor Unit CS-MKS12NB4U 1 Indoor air temp. 86F (30C) 80F (27C) Outdoor Unit CU-3KS19NBU Indoor Unit CS-KS18NB4UW 1 Indoor air temp. 86F (30C) Indoor air temp. 86F (30C) Indoor air temp. 86F (30C) Outdoor Unit CU-4KS24NBU Indoor Unit CS-MKS7NKU 1 5-1-2. Temperature Charts (CU-4KS24NBU) Indoor air temp. 86F (30C) 80F (27C) 75F (24C) Indoor air temp. 86F (30C) Outdoor Unit CU-4KS24NBU Indoor Unit CS-MKS9NKU 1 80F (27C) Indoor air temp. 86F (30C) Outdoor Unit CU-4KS24NBU Indoor Unit CS-MKS12NKU 1 Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) (In this case, be sure to stop all the indoor units where performance is not being checked.) 75F (24C) Outdoor Unit CU-4KS24NBU Indoor Unit CS-MKS18NKU 1 Indoor air temp. 86F (30C) Indoor air temp. 86F (30C) 75F (24C) Indoor air temp. 86F (30C) Outdoor Unit CU-4KS24NBU Indoor Unit CS-MKS24NKU 1 80F (27C) 75F (24C) Indoor air temp. 86F (30C) 80F (27C) Outdoor Unit CU-4KS24NBU Indoor Unit CS-MKS9NB4U 1 Outdoor Unit CU-4KS24NBU Indoor Unit CS-MKS12NB4U 1 Indoor air temp. 86F (30C) 80F (27C) Outdoor Unit CU-4KS24NBU Indoor Unit CS-KS18NB4UW 1 Indoor air temp. 86F (30C) Indoor air temp. 86F (30C) Indoor air temp. 86F (30C) Outdoor Unit CU-4KS31NBU Indoor Unit CS-MKS7NKU 1 5-1-3. Temperature Charts (CU-4KS31NBU) Indoor air temp. 86F (30C) 80F (27C) 75F (24C) 80F (27C) Outdoor Unit CU-4KS31NBU Indoor Unit CS-MKS9NKU 1 Indoor air temp. 86F (30C) Indoor air temp. 86F (30C) 80F (27C) 80F (27C) Outdoor Unit CU-4KS31NBU Indoor Unit CS-MKS12NKU 1 Indoor air temp. 86F (30C) Indoor air temp. 86F (30C) 80F (27C) 75F (24C) Outdoor Unit CU-4KS31NBU Indoor Unit CS-MKS18NKU 1 80F (27C) Indoor air temp. 86F (30C) 75F (24C) 80F (27C) Outdoor Unit CU-4KS31NBU Indoor Unit CS-MKS24NKU 1 Indoor air temp. 86F (30C) 80F (27C) 75F (24C) Indoor air temp. 86F (30C) Outdoor Unit CU-4KS31NBU Indoor Unit CS-MKS9NB4U 1 Indoor air temp. 86F (30C) Indoor air temp. 86F (30C) 80F (27C) 80F (27C) Outdoor Unit CU-4KS31NBU Indoor Unit CS-MKS12NB4U 1 Indoor air temp. 86F (30C) Indoor air temp. 86F (30C) 80F (27C) 75F (24C) Outdoor Unit CU-4KS31NBU Indoor Unit CS-KS18NB4UW 1 80F (27C) Indoor air temp. 86F (30C) 75F (24C) 80F (27C) 5-2. Cooling Capacity Indoor Unit : CS-MKS12NB4U 3 Page Indoor Unit : CS-KS18NB4UW + CS-MKS12NB4U + CS-MKS12NB4U Indoor Unit : CS-MKS9NKU 4 Indoor Unit : CS-MKS9NB4U 4 5-3. Cooling Capacity (Low Ambient) Indoor Unit : CS-MKS12NB4U 3 Page Indoor Unit : CS-KS18NB4UW + CS-MKS12NB4U + CS-MKS12NB4U Indoor Unit : CS-MKS9NKU 4 Power Supply : 230V Single Phase 60Hz Indoor Unit : CS-MKS9NB4U 4 Page Page Page 7. FUNCTIONS 7-1. Explanation of Functions Control/conditions COOL Unit operation Explanation Table 1 Frequency control Control/conditions SENSOR DRY 1/f fluctuation fan 250 200 6-minute cycle 150 100 (Step) 50 0 < Low Ambient Cooling Operation > 7-2. Protective Functions Description of function 7-2-1. Current Control (1) Automatic frequency control (2) Current control 7-2-2. Low Start Current 7-2-3. Compressor Temperature Control 8. TROUBLESHOOTING (BEFORE CALLING FOR SERVICE) 8-1. Precautions before Performing Inspection or Repair 8-2. Trouble Diagnosis by Error Monitor Lamps 8-2-1. Location of the Error Monitor Lamps 8-2-2. Display of the Error Monitor Lamps Warning 8-3-1. Checking the outdoor unit 8-3. Checking the Outdoor System 8-4. Trouble Diagnosis of Each Part 8-4-1. Problems of Each Part and Inspection Points 8-4-2. Inspection Points for Each Part *1 Page 8-5. Trouble Diagnosis of Fan Motor 9. REFRIGERANT R410A: SPECIAL PRECAUTIONS WHEN SERVICING UNIT 9-1. Characteristics of New Refrigerant R410A 9-1-1. What is New Refrigerant R410A? 9-1-2. Components (mixing proportions) 9-1-3. Characteristics 9-2. Checklist before Servicing 9-3. Tools Specifically for R410A 9-4. Tubing Installation Procedures 9-5. In Case of Compressor Malfunction 9-5-1. Procedure for Replacing Compressor NO! 9-6. In Case Refrigerant is Leaking 9-7. Charging Additional Refrigerant 9-8. Retro-Fitting Existing Systems Page For Outdoor Unit This air conditioner uses the refrigerant R410A. External diameter of service port R410A: 5/16" Split System Air Conditioner INSTALLATION INSTRUCTIONS Contents IMPORTANT! Please Read Before Starting If Necessary, Get Help In Case of Improper Installation SPECIAL PRECAUTIONS When Wiring When Servicing Others NOTE 1. General 2. Installation Site Selection Page Fig. 4b (2) Connecting indoor unit for CU-4KS24NBU Fig. 4c (1) Connecting indoor unit for CU-3KS19NBU Fig. 4a Fig. 4d (D) Fig. 4f (C) Fig. 4e Fig. 4g (3) Connecting indoor unit for CU-4KS31NBU Fig. 4h (C) Fig. 4i (D) Fig. 4j (E) Fig. 4k NO (1) Recommended dimensions of the baffle plates Fig. 5h For Air Intake Air Intake Baffle Air Discharge Baffle Air Intake Baffle Air Discharge Baffle Fig. 5g Page Fig. 6a unit: inch (mm) A (3) CU-4KS31NBU A Fig. 6b 2-6. Diagram of Outdoor Unit Installation Never install only a single indoor unit. Over 10"(25cm) Fig. 7 Access panel C Over 8"(20cm) 3. Installation Process A C B D Page 4. Air Purging C B A (for Test Run) Page C D B A D C B A 5. Wiring Instructions WARNING Be sure to comply with local codes on running the UNIT A L2 * Page Indoor unit B Indoor unit A Fig. 31 Outdoor unit Indoor unit C 6. Test Run 7. Connecting a Home Automation Device 8. Installation Check Sheet