This document provides a comprehensive service manual for Panasonic Room Air Conditioners, models CS-A75KR, CU-A75KR, CS-A95KR, CU-A95KR, CS-A125KR, and CU-A125KR. It covers functions, product specifications, dimensions, refrigeration cycle diagrams, block diagrams, wiring diagrams, operation details, installation instructions, troubleshooting, technical data, exploded views, and parts lists.
Function Description
The Panasonic Room Air Conditioner offers a range of features designed for comfort, efficiency, and ease of use. Key functions include:
Comfort Environment
- 8 hours of sleep mode operation: Automatically adjusts temperature for comfortable sleep.
- Air purifying filter with deodorizing function: Reduces dust, smoke, and odors.
- Catechin Air Purifying Filter: Traps dust, tobacco smoke, and tiny particles, preventing the growth of bacteria and viruses.
- Deodorizing Filter: Enhances air quality by removing unpleasant smells.
- Random Auto Restart: Automatically restarts the unit after a power failure at a randomly determined time (3 to 5.5 minutes) with previous settings.
- Removable and Washable Front Panel: Facilitates easy cleaning and maintenance.
- Remote Control-Self Illuminating Button: Improves visibility and ease of use in low light.
- Anti cold draft control: Prevents cold air from blowing directly during heating operation.
Quality Improvement
- Gas leakage protection: Ensures safety by detecting and preventing refrigerant leaks.
- Prevent compressor reverse rotation: Protects the compressor from damage due to reverse rotation, especially after instantaneous power failures.
- 2-stage OLP to protect compressor: Provides robust protection for the compressor against overload.
- Noise prevention during Soft Dry operation: Ensures quiet operation during dehumidification.
Service Improvement
- Easy fan motor replacement procedure: Simplifies maintenance and repair tasks.
Operation Improvement
- Economy mode: Reduces electrical power consumption, ideal for maintaining temperature after reaching the desired level.
- Powerful mode: Quickly reaches the desired room temperature.
- Long Installation Piping: Allows for flexible installation with piping lengths up to 10 meters for CS/CU-A75KR, CS/CU-A95KR, and up to 15 meters for CS/CU-A125KR.
Important Technical Specifications
The air conditioner models come with varying capacities and electrical specifications:
Cooling Capacity
- CS-A75KR/CU-A75KR: 2.11 - 2.06 kW (7,200 - 7,020 BTU/h)
- CS-A95KR/CU-A95KR: 2.65 - 2.60 kW (9,040 - 8,870 BTU/h)
- CS-A125KR/CU-A125KR: 3.40 - 3.40 kW (11,600 - 11,600 BTU/h)
Heating Capacity
- CS-A75KR/CU-A75KR: 2.30 - 2.25 kW (7,840 - 7,670 BTU/h)
- CS-A95KR/CU-A95KR: 3.20 - 3.10 kW (10,900 - 10,600 BTU/h)
- CS-A125KR/CU-A125KR: 4.15 - 4.05 kW (14,200 - 13,800 BTU/h)
Electrical Data
- Power Source: Single phase, 240-220 V, 50 Hz.
- Running Current (Cooling): 3.2 - 3.0 A (A75KR), 4.3 - 4.3 A (A95KR), 5.4 - 5.6 A (A125KR)
- Running Current (Heating): 3.0 - 2.8 A (A75KR), 4.0 - 3.9 A (A95KR), 5.0 - 5.2 A (A125KR)
- Starting Current: 11.2 A (A75KR), 16.4 A (A95KR), 26.0 A (A125KR)
- EER (Cooling): 3.20 - 3.38 W/W (10.9 - 11.5 BTU/hW) (A75KR), 2.73 - 2.83 W/W (9.3 - 9.6 BTU/hW) (A95KR), 2.60 - 2.70 W/W (8.9 - 9.2 BTU/hW) (A125KR)
- COP (Heating): 3.59 - 3.88 W/W (12.3 - 13.2 BTU/hW) (A75KR), 3.52 - 3.69 W/W (12.0 - 12.6 BTU/hW) (A95KR), 3.35 - 3.40 W/W (11.4 - 11.6 BTU/hW) (A125KR)
Dimensions and Weight
- Indoor Unit (H x W x D): 279 x 799 x 199 mm (10-31/32 x 31-15/32 x 7-27/32 inches)
- Indoor Unit Net Weight: 9.0 kg (20 lb)
- Outdoor Unit (H x W x D): 457.2 x 856 x 25.4 mm (18 x 33-11/16 x 10 inches) for A75KR/A95KR, 508 x 782.9 x 25.4 mm (20 x 30-13/16 x 10 inches) for A125KR
- Outdoor Unit Net Weight: 29.0 kg (64 lb) for A75KR, 32.0 kg (71 lb) for A95KR, 39.0 kg (86 lb) for A125KR
Refrigeration System
- Refrigerant: R-22 (860 g for A75KR/A95KR, 900 g for A125KR)
- Compressor Type: Rotary (rolling piston)
- Refrigerant Control Device: Capillary
- Refrigeration Oil: SUNISO 4GDID / ATMOS M60
Usage Features
Operation Modes
- Cooling Mode: Standard cooling operation with time delay safety control (3 minutes) and 7-minute time save control. Anti-freezing control prevents indoor heat exchanger from freezing.
- Soft Dry Mode: Dehumidification operation where the indoor fan operates at low speed, cycling on and off for up to 10 minutes ON and 6 minutes OFF.
- Heating Mode: Standard heating operation with time delay safety control (3 minutes) and 30-minute time save control. Hot Start control prevents cold drafts by delaying indoor fan operation until the heat exchanger reaches 30°C. Deicing operations prevent frosting on the outdoor heat exchanger.
- Automatic Mode: Automatically selects cooling, soft dry, or heating based on room temperature. The indoor fan operates at low speed for 25 seconds to sense intake air temperature and determine the initial operation mode.
- Sleep Mode: Automatically adjusts temperature (rises by 0.5°C in cooling/soft dry, decreases by 2-3°C in heating) and fan speed for comfortable sleep over 8 hours.
- Economy Mode: Reduces power consumption by automatically adjusting the set temperature (increases by 0.5°C in cooling/soft dry, decreases by 0.5°C in heating) and running the fan at random speed.
- Powerful Mode: Quickly achieves the desired temperature by automatically decreasing the set temperature by 3°C in cooling/soft dry (with super high fan speed) or increasing by 3°C in heating. Operates for 15 minutes.
Airflow Control
- Vertical Airflow Direction: Louver swings up and down in cooling/soft dry mode. In heating mode, it adjusts based on intake air temperature to prevent cold drafts.
- Horizontal Airflow Direction: Left and right louvers can be adjusted manually.
- Fan Speed Control: Manual (Lo, Me, Hi) or automatic fan speed adjustment.
Remote Control
- Self-illuminating buttons: For easy use in the dark.
- Timer functions: ON-Timer and OFF-Timer for scheduled operation.
- Signal receiving sound: Audible feedback for remote control commands, with an option to switch off the sound.
Maintenance Features
User Maintenance
- Removable and Washable Front Panel: Easily removed for cleaning.
- Air Filters: Should be cleaned every two weeks.
- Air Purifying Filters (Catechin and Deodorizing): Should be changed every three months.
- Indoor Unit: Wipe gently with a soft, dry cloth. Avoid hot water or polishing fluids.
- Front Panel: Can be removed and washed with water and a sponge.
Professional Maintenance (Installation and Servicing)
- Safety Precautions: Detailed instructions for safe installation and servicing, including electrical work, piping connections, and refrigerant handling.
- Installation Tools: List of required tools such as Philips screwdriver, spanner, gas leak detector, torque wrench, electric drill, reamer, thermometer, vacuum pump, knife, megameter, and gauge manifold.
- Evacuation Procedures: Step-by-step guide for evacuating air from the refrigeration cycle during installation, re-installation, and when balancing refrigerant.
- Gas Charging: Procedure for charging the system with liquid refrigerant.
- Troubleshooting Guide: Provides methods for diagnosing malfunctions based on refrigeration cycle conditions, pressure, and electric current.
- Exploded Views and Parts Lists: Detailed diagrams and lists for easy identification and replacement of components for both indoor and outdoor units.
- Electronic Circuit Diagram: Provides a schematic for understanding the electrical connections and components.
- Sensor/Thermistor Characteristics: Data for pipe temperature and intake air temperature sensors.
- OLP Characteristics: Overload protector trip current characteristics for the compressor.
- Fan Motor Windings Resistance: Specifications for indoor and outdoor fan motor windings.
- Compressor Windings Resistance: Specifications for compressor windings.
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