Order No: PAPAMY1204088CE Indoor Unit CS-E18NKUA CS-E24NKUA Outdoor Unit CU-E18NKUA CU-E24NKUA WARNING This service information is designed for experienced repair technicians only and is not designed for use by the general public. It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product. Products powered by electricity should be serviced or repaired only by experienced professional technicians.
12.2 12.3 12.4 12.5 Indoor Fan Motor Operation .......................31 Outdoor Fan Motor Operation ....................32 Airflow Direction..........................................32 Quiet Operation (Cooling Mode/Cooling Area of Dry Mode)...............................................33 12.6 Quiet Operation (Heating) ..........................34 12.7 Powerful Mode Operation...........................34 12.8 Timer Control..............................................35 12.9 Auto Restart Control .........
1. Safety Precautions Read the following “SAFETY PRECAUTIONS” carefully before perform any servicing. Electrical work must be installed or serviced by a licensed electrician. Be sure to use the correct rating of the power plug and main circuit for the model installed. The caution items stated here must be followed because these important contents are related to safety. The meaning of each indication used is as below.
19. During installation, install the refrigerant piping properly before run the compressor. (Operation of compressor without fixing refrigeration piping and valves at opened condition will cause suck-in of air, abnormal high pressure in refrigeration cycle and result in explosion, injury etc.). 20. During pump down operation, stop the compressor before remove the refrigeration piping.
2. Specification Model Indoor CS-E18NKUA CS-E24NKUA Outdoor CU-E18NKUA CU-E24NKUA ARI ARI Performance Test Condition Phase, Hz Power Supply Cooling Capacity 230 208 230 Min. Mid. Max. Min. Mid. Max. Min. Mid. Max. Min. Mid. Max. kW 1.70 5.01 5.80 1.70 5.01 5.80 1.70 7.02 8.00 1.70 7.02 8.00 BTU/h 5800 17100 19800 5800 17100 19800 5800 24000 27200 5800 24000 27200 A - 7.20 - - 6.30 - - 11.90 - - 10.80 - Input Power W 430 1.30k 1.60k 430 1.
Outdoor Fan Type Propeller Propeller Material PP PP Motor Type DC Motor (8 poles) DC Motor (8 poles) - - Input Power W Output Power W 60 60 rpm Cooling: 700 Heating: 700 Cooling: 700 Heating: 750 Speed Hi Moisture Removal L/h (Pt/h) 3 3 3 3 3 3 3 3 3 3 3 3 QLo m /min (ft /min) Lo m /min (ft /min) Me m /min (ft /min) Hi m /min (ft /min) SHi m /min (ft /min) Hi m /min (ft /min) Indoor Airflow Outdoor Airflow 1.4 (3.0) 3.6 (7.6) Cooling : 11.
1. 2. 3. DRY BULB WET BULB DRY BULB WET BULB Indoor Operation Range (Cooling) Maximum 89.6 73.4 89.6 73.4 Minimum 60.8 51.8 60.8 51.8 Outdoor Operation Range (Cooling) Maximum 109.4 78.8 109.4 78.8 Minimum 0.0 - 0.0 - Indoor Operation Range (Heating) Maximum 86.0 - 86.0 - Minimum 60.8 - 60.8 - Outdoor Operation Range (Heating) Maximum 75.2 64.4 75.2 64.4 Minimum 5.0 3.2 5.0 3.
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4. Location of Controls and Components 4.1 Indoor Unit 4.2 Outdoor Unit 4.
5. Dimensions 5.
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8. Wiring Connection Diagram 8.
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9. Electronic Circuit Diagram 9.
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10. Printed Circuit Board 10.1 10.1.
10.1.2 Power Printed Circuit Board 10.1.
10.2 10.2.
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11. Installation Instruction 11.1 11.1.1 11.2 Indoor Unit Do not install the unit in excessive oil fume area such as kitchens, workshops and etc. There should not be any heat source or steam near the unit. There should not be any obstacles blocking the air circulation. A place where air circulation in the room is good. A place where drainage can be easily done. A place where noise prevention is taken into consideration. Do not install the unit near the door way.
11.3 11.3.1 Indoor Unit How to Fix Installation Plate The mounting wall must be strong and solid enough to prevent it from the vibration. The center of installation plate should be at more than c at right and left of the wall. The distance from installation plate edge to ceiling should more than d. From installation plate left edge to unit’s left side is e. From installation plate right edge to unit’s right side is f.
11.3.3 Indoor Unit Installation 11.3.4 For the right rear piping 11.3.5 For the right bottom piping 11.3.6 For the embedded piping (This can be used for left rear piping and bottom piping also.
11.3.7 Connect the Cable to the Indoor Unit 1. The inside and outside connecting cable can be connected without removing the front grille. 2. Unscrew the conduit cover and fix the conduit connector to conduit cover with lock nut, then secure it against chassis. 3. Connecting wire between indoor unit and outdoor unit should be UL listed or CSA approved 4 conductor wires minimum AWG16 in accordance with local electric codes.
11.3.8 11.3.9 1 2 3 Wiring Stripping and connecting requirement Cutting and flaring the piping Please cut using pipe cutter and then remove the burrs. Remove the burrs by using reamer. If burrs are not removed, gas leakage may be caused. Turn the piping end down to avoid the metal powder entering the pipe. Please make flare after inserting the flare nut onto the copper pipes.
11.4 Outdoor Unit 11.4.1 Install the Outdoor Unit After selecting the best location, start installation according to indoor/outdoor unit installation diagram. 1 Fix the unit on concrete or rigid frame firmly and horizontally by bolt nut (ø13/32"). 2 When installing at roof, please consider strong wind and earthquake. Please fasten the installation stand firmly with bolt or nails. Model E18NKUA, E24NKUA 11.4.2 11.4.2.
11.4.3 Evacuation of the equipment WHEN INSTALLING AN AIR CONDITIONER, BE SURE TO EVACUATE THE AIR INSIDE THE INDOOR UNIT AND PIPES in the following procedures. 1. Connect a charging hose with a push pin to the Low side of a charging set and the service port of the 3-way valve. 2. Connect the micron gauge between vacuum pump and service port of outdoor units. 3. Turn on the power switch of the vacuum pump and make sure that connect digital micron gauge and to pull down to a value of 500 microns. 4.
9. Secure the wire onto the control board with the holder (clamper). 10. After completing wiring connections, reattach the particular plate control board cover (metal and resin) and the original position with the screws. 11. For wire stripping and connection requirement, refer to instruction 11.3.7 of indoor unit. This equipment must be properly earthed.
12. Operation Control 12.1 Basic Function Inverter control, which equipped with a microcomputer in determining the most suitable operation mode as time passes, automatically adjusts output power for maximum comfort always. In order to achieve the suitable operation mode, the microcomputer maintains the set temperature by measuring the temperature of the environment and performing temperature shifting.
12.1.5 This mode can be set using remote control and the operation is decided by remote control setting temperature, remote control operation mode and indoor intake air temperature. During operation mode judgment, indoor fan motor (with speed of Lo-) is running for 30 seconds to detect the indoor intake air temperature. Every 10 minutes, the indoor temperature is judged. For the 1st judgment o If indoor intake temperature - remote control setting temperature ≥ 3.6°F, COOL mode is decided.
[Heating] o According to indoor pipe temperature, automatic heating fan speed is determined as follows. Feedback control o Immediately after the fan motor started, feedback control is performed once every second. o During fan motor on, if fan motor feedback ≥ 2550 rpm or < 50 rpm continue for 10 seconds, then fan motor error counter increase, fan motor is then stop and restart. If the fan motor counter becomes 7 times, then H19 - fan motor error is detected. Operation stops and cannot on back. 12.
Manual vertical airflow direction can be set using remote control; the angles of the vane are as stated above and the positions of the vane are as Figure 2 below. When the air conditioner is stopped using remote control, the vane will shift to close position. 12.4.2 Horizontal Airflow Automatic horizontal airflow direction can be set using remote control; the vane swings left and right within the angles as stated below.
During quiet operation, if ON timer activates, quiet operation maintains. After off, when on back, quiet operation is not memorised. Control contents o Auto fan speed is change from normal setting to quiet setting of respective fan speed. This is to reduce sound of Hi, Me, Lo for 3dB. o Manual fan speed for quiet operation is -1 step from setting fan speed. 12.6 Quiet Operation (Heating) Purpose o To provide quiet heating operation compare to normal operation.
12.8 12.8.1 OFF Timer Control OFF Timer can be set using remote control, the unit with timer set will stop at set time. 12.9 ON Timer Control ON Timer can be set using remote control, where the unit with timer set will start operation earlier than the setting time. This is to provide a comfortable environment when reaching the set ON time.
13. Protection Control 13.1 13.1.1 30 Seconds Forced Operation Once the air conditioner is turned on, the compressor will not stop within 30 seconds in a normal operation although the intake air temperature has reached the thermo-off temperature. However, force stop by pressing the OFF/ON button at the remote control is permitted or the Auto OFF/ON button at indoor unit.
13.1.5 Instructed frequency for compressor operation will be regulated by compressor discharge temperature. The changes of frequency are as below. If compressor discharge temperature exceeds 233.6°F, compressor will be stopped, occurs 4 times per 20 minutes, timer LED will be blinking. “F97” is indicated. 13.1.6 Low Frequency Protection Control 1 When the compressor operates at frequency lower than 25Hz continued for 240 minutes, the operation frequency will be changed to 24Hz for 2 minutes.
13.2.2 Pipe temperature limitation / restriction. o Detects the outdoor pipe temperature and carry out restriction / limitation below (Limit the compressor operation frequency) o The compressor stops if outdoor pipe temperature exceeds 145.4°F. o If the compressor stops 4 times in 20 minutes, Timer LED blinks (“F95” indicated: Outdoor high pressure rise protection) 13.2.
13.2.6.3 The compressor operating frequency is regulated in accordance to indoor heat exchanger temperature as shown below. If the heat exchanger temperature exceeds 140.0°F, compressor will stop. 13.2.6.4 Cold Draught Prevention Control When indoor pipe temperature is low, cold draught operation starts where indoor fan speed will be reduced or stop. Horizontal vane angle may be adjusted in Auto vane setting. 13.2.6.
14. Servicing Mode 14.1 Auto Off/On Button 1 AUTO OPERATION MODE The Auto operation will be activated immediately once the Auto OFF/ON button is pressed. This operation can be used to operate air conditioner with limited function if remote control is misplaced or malfunction. 2 TEST RUN OPERATION (FOR PUMP DOWN/SERVICING PURPOSE) The Test Run operation will be activated if the Auto OFF/ON button is pressed continuously for more than 5 seconds.
Press Auto OFF/ON button to toggle remote control receiving sound. - Short “beep”: Turn OFF remote control receiving sound. - Long “beep”: Turn ON remote control receiving sound. After Auto OFF/ON button is pressed, the 20 seconds counter for Remote Control Receiving Sound OFF/ON Mode is restarted. 14.2 14.2.1 TIMER ▼ To change remote control display from Degree Celsius (°C) to Degree Fahrenheit (°F) o Press continuously for 10 seconds. 14.2.
15. Troubleshooting Guide 15.1 Refrigeration Cycle System In order to diagnose malfunctions, make sure that there are no electrical problems before inspecting the refrigeration cycle. Such problems include insufficient insulation, problem with the power source, malfunction of a compressor and a fan. The normal outlet air temperature and pressure of the refrigeration cycle depends on various conditions, the standard values for them are shown in the table on the right.
15.1.1 Relationship between the condition of the air conditioner and pressure and electric current Carry out the measurements of pressure, electric current, and temperature fifteen minutes after an operation is started.
15.2 15.2.1 Breakdown Self Diagnosis Function Self Diagnosis Function (Three Digits Alphanumeric Code) Once error occurred during operation, the unit will stop its operation, and Timer LED blinks. Although Timer LED goes off when power supply is turned off, if the unit is operated under a breakdown condition, the LED will ON again. In operation after breakdown repair, the Timer LED will not blink. The last error code (abnormality) will be stored in IC memory. 15.2.2 1 2 3 4 5 6 7 8 15.2.
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Note: “○” – Frequency measured and fan speed fixed The memory data of error code is erased when the power supply is cut off, or press the Auto Switch until “beep” sound heard following by pressing the CHECK button at remote control. Although operation forced to stop when abnormality detected, emergency operation is possible for certain errors (refer to Error Code Table) by using remote control or Auto OFF/ON button at indoor unit.
15.4 Self-diagnosis Method 15.4.1 H11 (Indoor/Outdoor Abnormal Communication) Malfunction Decision Conditions During startup and operation of cooling and heating, the data received from outdoor unit in indoor unit signal transmission is checked whether it is normal. Malfunction Caused Faulty indoor unit PCB. Faulty outdoor unit PCB. Indoor unit-outdoor unit signal transmission error due to wrong wiring.
15.4.2 H14 (Indoor Intake Air Temperature Sensor Abnormality) Malfunction Decision Conditions During startup and operation of cooling and heating, the temperatures detected by the indoor intake air temperature sensor are used to determine sensor errors. Malfunction Caused Faulty connector connection. Faulty sensor. Faulty PCB.
15.4.3 H16 (Outdoor Current Transformer Open Circuit) Malfunction Decision Conditions A current transformer (CT) is detected by checking the compressor running frequency (≥ rated frequency) and CT detected input current (less than 0.65A) for continuously 20 seconds.
15.4.4 H19 (Indoor Fan Motor – DC Motor Mechanism Locked) Malfunction Decision Conditions The rotation speed detected by the Hall IC during fan motor operation is used to determine abnormal fan motor (feedback of rotation > 2550rpm or < 50rpm) Malfunction Caused Operation stops due to short circuit inside the fan motor winding. Operation stops due to breaking of wire inside the fan motor. Operation stops due to breaking of fan motor lead wires. Operation stops due to Hall IC malfunction.
15.4.5 H23 (Indoor Pipe Temperature Sensor Abnormality) Malfunction Decision Conditions During startup and operation of cooling and heating, the temperatures detected by the indoor heat exchanger temperature sensor are used to determine sensor errors. Malfunction Caused Faulty connector connection. Faulty sensor. Faulty PCB.
15.4.6 H27 (Outdoor Air Temperature Sensor Abnormality) Malfunction Decision Conditions During startup and operation of cooling and heating, the temperatures detected by the outdoor air temperature sensor are used to determine sensor errors. Malfunction Caused Faulty connector connection. Faulty sensor. Faulty PCB.
15.4.7 H28 (Outdoor Pipe Temperature Sensor Abnormality) Malfunction Decision Conditions During startup and operation of cooling and heating, the temperatures detected by the outdoor pipe temperature sensor are used to determine sensor errors. Malfunction Caused Faulty connector connection. Faulty sensor. Faulty PCB.
15.4.8 H30 (Compressor Discharge Temperature Sensor Abnormality) Malfunction Decision Conditions During startup and operation of cooling and heating, the temperatures detected by the outdoor discharge pipe temperature sensor are used to determine sensor errors. Malfunction Caused Faulty connector connection. Faulty sensor. Faulty PCB.
15.4.9 H33 (Unspecified Voltage between Indoor and Outdoor) Malfunction Decision Conditions The supply power is detected for its requirement by the indoor/outdoor transmission. Malfunction Caused Wrong models interconnected. Wrong indoor unit and outdoor unit PCBs used. Indoor unit or outdoor unit PCB defective.
15.4.10 H98 (Indoor High Pressure Protection) Error Code will not display (no Timer LED blinking) but store in EEPROM Malfunction Decision Conditions During heating operation, the temperature detected by the indoor pipe temperature sensor is above 140.0°F.
15.4.11 H99 (Indoor Freeze Prevention Protection: Cooling or Soft Dry) Malfunction Decision Conditions Freeze prevention control takes place (when indoor pipe temperature is lower than 35.
15.4.12 F11 (Indoor Pipe Temperature Sensor Abnormality) Malfunction Decision Conditions When cooling operation, when indoor pipe temperature or indoor heat exchanger temperature sensor is above 113.0°F. Malfunction Caused Faulty connector connection. Faulty indoor pipe temperature sensor. Faulty indoor main PCB.
15.4.13 F90 (Power Factor Correction Protection) Malfunction Decision Conditions During startup and operation of cooling and heating, when Power Factor Correction (PFC) protection circuitry at the outdoor unit main PCB senses abnormal high DC voltage level. Malfunction Caused DC voltage peak due to power supply surge. DC voltage peak due to compressor windings not uniform. Faulty outdoor PCB.
15.4.14 F91 (Refrigeration Cycle Abnormality) Malfunction Decision Conditions During cooling, compressor frequency = Fcmax. During cooling and heating operation, running current: 0.65A < I < 1.65A. During cooling, indoor intake - indoor pipe < 39.2°F. Malfunction Caused Refrigerant shortage (refrigerant leakage) Poor compression performance of compressor. 2/3 way valve closed. Detection error due to faulty indoor intake air or indoor pipe temperature sensors.
15.4.15 F93 (Compressor Rotation Failure) Malfunction Decision Conditions A compressor rotation failure is detected by checking the compressor running condition through the position detection circuit.
15.4.16 F95 (Cooling High Pressure Abnormality) Malfunction Decision Conditions During operation of cooling, when outdoor unit heat exchanger high temperature data (141.8°F) is detected by the outdoor pipe temperature sensor. Malfunction Caused Outdoor pipe temperature rise due to short circuit of hot discharge air flow. Outdoor pipe temperature rise due to defective of outdoor fan motor. Outdoor pipe temperature rise due to defective outdoor pipe temperature sensor.
15.4.17 F96 (IPM Overheating) Malfunction Decision Conditions During operating of cooling and heating, when IPM temperature data (212.0°F) is detected by the IPM temperature sensor. Malfunction Caused IPM overheats due to short circuit of hot discharge air flow. IPM overheats due to defective of outdoor fan motor. IPM overheats due to defective of internal circuitry of IPM. IPM overheats due to defective IPM temperature sensor.
15.4.18 F97 (Compressor Overheating) Malfunction Decision Conditions During operation of cooling and heating, when compressor tank temperature data (233.6°F) is detected by the compressor tank temperature sensor. Malfunction Caused Refrigerant shortage (refrigerant leakage). 2/3 way valve closed. Detection error due to faulty compressor tank temperature sensor.
15.4.19 F98 (Input Over Current Detection) Malfunction Decision Conditions During cooling and heating operation, when an input over-current (16.8A) is detected by checking the input current value being detected by current transformer (CT) with the compressor running. Malfunction Caused Over-current due to compressor failure. Over-current due to defective outdoor unit PCB. Over-current due to defective inverter main circuit electrolytic capacitor. Over-current due to excessive refrigerant.
15.4.20 F99 (Output Over Current Detection) Malfunction Decision Conditions During operation of cooling and heating, when an output over-current (18.5A) is detected by checking the current that flows in the inverter DC peak sensing circuitry. Malfunction Caused DC peak due to compressor failure. DC peak due to defective power transistor(s). DC peak due to defective outdoor unit PCB.
16. Disassembly and Assembly Instructions WARNING High Voltage is generated in the electrical parts area by the capacitor. Ensure that the capacitor has discharged sufficiently before proceeding with repair work. Failure to heed this caution may result in electric shocks. 16.1 Indoor Electronic Controllers, Cross Flow Fan and Indoor Fan Motor Removal Procedures 16.1.1 16.1.1.
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16.1.1.3 To remove control board 16.1.1.
17. Technical Data 17.1 17.1.1 CS-E18NK CU-E18NK Cooling Characteristic o Room temperature: 81°F (DBT), 66°F (WBT) o Operation condition: High fan speed o Piping length: 24.6ft o Compressor Frequency : Fc 208 230 63.000 Outlet Air Temperature (°F) 62.000 61.000 60.000 59.000 58.000 57.000 60 65 70 75 80 85 90 95 100 105 110 115 100 105 110 115 100 105 110 115 100 105 110 115 Outdoor Air Temperature (°F) 6.000 5.800 Cooling Capacity (kW) 5.600 5.400 5.200 5.000 4.800 4.600 4.
Piping Length Characteristic Cooling o Room temperature: 81°F (DBT), 66°F (WBT) o Operation condition: High fan speed o Outdoor temperature: 95°F (DBT) o Compressor Frequency : Fc 208 230 60.500 Outlet Air Temperature (°F) 60.400 60.300 60.200 60.100 60.000 59.900 59.800 9 14 19 24 29 34 39 44 49 54 59 64 69 74 79 84 89 94 99 104 Piping Length (ft) 5.100 Cooling Capacity (kW) 5.000 4.900 4.800 4.700 4.600 4.500 4.
Heating Characteristic o Room temperature: 68°F (DBT) o Operation condition: High fan speed o Piping length: 24.6ft o Compressor Frequency : Fh 208 230 125.000 Outlet Air Temperature (°F) 120.000 115.000 110.000 105.000 100.000 95.000 90.000 14 19 24 29 34 39 44 49 54 59 64 69 74 79 59 64 69 74 79 59 64 69 74 79 59 64 69 74 79 Outdoor Air Temperature (°F) 7.900 7.400 Heating Capacity (kW) 6.900 6.400 5.900 5.400 4.900 4.400 3.900 3.
Piping Length Characteristic Heating o Room temperature: 68°F (DBT) o Operation condition: High fan speed o Outdoor temperature: 47°F (DBT), 43°F (WBT) o Compressor Frequency : Fh 208 230 101.000 Outlet Air Temperature (°F) 100.000 99.000 98.000 97.000 96.000 95.000 94.000 93.000 92.000 9 14 19 24 29 34 39 44 49 54 59 64 69 74 79 84 89 94 99 104 Piping Length (ft) 6.200 6.000 Heating Capacity (kW) 5.800 5.600 5.400 5.200 5.000 4.800 4.
17.1.2 Cooling Characteristic o Room temperature: 81°F (DBT), 66°F (WBT) o Operation condition: High fan speed o Piping length: 24.6ft o Compressor Frequency : Fc 208 230 56.000 Outlet Air Temperature (°F) 55.000 54.000 53.000 52.000 51.000 50.000 60 65 70 75 80 85 90 95 100 105 110 115 100 105 110 115 100 105 110 115 100 105 110 115 Outdoor Air Temperature (°F) 7.800 Cooling Capacity (kW) 7.300 6.800 6.300 5.800 5.
Piping Length Characteristic Cooling o Room temperature: 81°F (DBT), 66°F (WBT) o Operation condition: High fan speed o Outdoor temperature: 95°F (DBT) o Compressor Frequency : Fc 208 230 55.400 Outlet Air Temperature (°F) 55.200 55.000 54.800 54.600 54.400 54.200 54.000 53.800 53.600 9 14 19 24 29 34 39 44 49 54 59 64 69 74 79 84 89 94 99 104 Piping Length (ft) 7.200 Cooling Capacity (kW) 7.150 7.100 7.050 7.000 6.950 6.
Heating Characteristic o Room temperature: 68°F (DBT) o Operation condition: High fan speed o Piping length: 24.6ft o Compressor Frequency : Fh 208 230 138.000 Outlet Air Temperature (°F) 133.000 128.000 123.000 118.000 113.000 108.000 103.000 98.000 93.000 14 19 24 29 34 39 44 49 54 59 64 69 74 79 59 64 69 74 79 59 64 69 74 79 59 64 69 74 79 Outdoor Air Temperature (°F) 10.400 Heating Capacity (kW) 9.400 8.400 7.400 6.400 5.400 4.
Piping Length Characteristic Heating o Room temperature: 68°F (DBT) o Operation condition: High fan speed o Outdoor temperature: 47°F (DBT), 43°F (WBT) o Compressor Frequency : Fh 208 230 115.000 Outlet Air Temperature (°F) 113.000 111.000 109.000 107.000 105.000 103.000 101.000 99.000 9 14 19 24 29 34 39 44 49 54 59 64 69 74 79 84 89 94 99 104 Piping Length (ft) 9.000 Heating Capacity (kW) 8.500 8.000 7.500 7.000 6.
18. Exploded View and Replacement Parts List 18.1 Indoor Unit Note The above exploded view is for the purpose of parts disassembly and replacement. The non-numbered parts are not kept as standard service parts.
REF. NO. PART NAME & DESCRIPTION QTY.
18.2 Outdoor Unit Note The above exploded view is for the purpose of parts disassembly and replacement. The non-numbered parts are not kept as standard service parts.
REF. NO. PART NAME & DESCRIPTION QTY.
