Panasonic E12NKUA Service Manual

Order No: PHAAM1111087C1

Indoor Unit Outdoor Unit

CS-E9NKUAW

CS-E12NKUAW

CU-E9NKUA

CU-E12NKUA

Please file and use this manual together with the service manual for Model No. CU-2E18NBU, Order No. PHAAM1111120A1.

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. Any attempt to service or repair the products dealt with in this service information by anyone else could result in serious injury or death.

PRECAUTION OF LOW TEMPERATURE

In order to avoid frostbite, be assured of no refrigerant leakage during the installation or repairing of refrigerant circuit.

WARNING

TABLE OF CONTENTS

1. Safety Precautions.............................................3

2. Specification .......................................................5

3. Features ..............................................................8

4. Location of Controls and Components ...........9

4.1 Indoor Unit....................................................9

4.2 Outdoor Unit.................................................9

4.3 Remote Control ............................................9

5. Dimensions.......................................................10

5.1 Indoor Unit..................................................10

5.2 Outdoor Unit...............................................11

6. Refrigeration Cycle Diagram........................... 12

7. Block Diagram ..................................................13

8. Wiring Connection Diagram............................14

8.1 Indoor Unit..................................................14

8.2 Outdoor Unit ...............................................15

9. Electronic Circuit Diagram ..............................16

9.1 Indoor Unit..................................................16

9.2 Outdoor Unit ...............................................17

10. Printed Circuit Board .......................................18

10.1 Indoor Unit..................................................18

10.2 Outdoor Unit ...............................................20

11. Installation Instruction.....................................21

11.1 Select the Best Location ............................21

11.2 Indoor Unit..................................................22

11.3 Outdoor Unit ...............................................26

12. Operation Control.............................................29

12.1 Basic Function............................................29

12.2 Indoor Fan Motor Operation.......................30

12.3

Outdoor Fan Motor Operation ....................31

12.4 Airflow Direction..........................................31

12.5 Quiet Operation (Cooling Mode/Cooling Area

of Dry Mode)...............................................32

12.6 Quiet Operation (Heating) ..........................32

12.7 Powerful Mode Operation...........................33

12.8 Timer Control..............................................33

12.9 Auto Restart Control...................................33

12.10 Indication Panel ..........................................34

13. Operation Control (For Multi Split

Connection).......................................................35

13.1 Cooling operation .......................................35

13.2 Soft Dry Operation......................................35

13.3 Heating Operation ......................................35

13.4 Automatic Operation...................................36

13.5 Indoor Fan Motor Operation .......................36

13.6 Powerful Mode Operation...........................36

13.7 Auto restart control .....................................36

13.8 Indication Panel ..........................................36

14. Protection Control ............................................37

14.1 Protection Control For All Operations.........37

14.2 Protection Control For Cooling & Soft Dry

Operation....................................................38

15. Servicing Mode .................................................41

15.1 Auto Off/On Button .....................................41

15.2 Remote Control Button...............................42

16. Troubleshooting Guide....................................43

16.1 Refrigeration Cycle System........................43

16.2 Breakdown Self Diagnosis Function...........45

16.3 Error Code Table........................................46

16.4 Self-diagnosis Method................................48

17. Disassembly and Assembly Instructions ......75

17.1 Indoor Electronic Controllers,

Cross Flow Fan and Indoor Fan Motor

Removal Procedures ..................................75

18. Technical Data ..................................................79

18.1 Operation Characteristics...........................79

19. Exploded View and Replacement Parts

List .....................................................................87

19.1 Indoor Unit ..................................................87

19.2 Outdoor Unit ...............................................89

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. Incorrect installation or servicing due to ignoring of the instruction will cause harm or damage, and the seriousness is classified by the following indications.

WARNING

CAUTION

 The items to be followed are classified by the symbols:

 Carry out test run to confirm that no abnormality occurs after the servicing. Then, explain to user the operation,

care and maintenance as stated in instructions. Please remind the customer to keep the operating instructions for future reference.

1. Do not modify the machine, part, material during repairing service.

This indication shows the possibility of causing death or serious injury

This indication shows the possibility of causing injury or damage to properties.

This symbol denotes item that is PROHIBITED from doing.

WARNING

2. If wiring unit is supplied as repairing part, do not repair or connect the wire even only partial wire break. Exchange the whole wiring unit.

3. Do not wrench the fasten terminal. Pull it out or insert it straightly.

4. Engage authorized dealer or specialist for installation and servicing. If installation of servicing done by the user is defective, it will cause water leakage, electrical shock or fire.

5. Install according to this installation instructions strictly. If installation is defective, it will cause water leakage, electric shock or fire.

6. Use the attached accessories parts and specified parts for installation and servicing. Otherwise, it will cause the set to fall, water leakage, fire or electrical shock.

7. Install at a strong and firm location which is able to withstand the set’s weight. If the strength is not enough or installation is not properly done, the set will drop and cause injury.

8. For electrical work, follow the local national wiring standard, regulation and the installation instruction. An independent circuit and single outlet must be used. If electrical circuit capacity is not enough or defect found in electrical work, it will cause electrical shock or fire.

9. This equipment is strongly recommended to be installed with Earth Leakage Circuit Breaker (ELCB) or Residual Current Device (RCD). Otherwise, it may cause electrical shock and fire in case equipment breakdown or insulation breakdown.

10. Do not use joint cable for indoor/outdoor connection cable. Use the specified indoor/outdoor connection cable, refer to installation instruction CONNECT THE CABLE TO THE INDOOR UNIT and connect tightly for indoor/outdoor connection. Clamp the cable so that no external force will be acted on the terminal. If connecting or fixing is not perfect, it will cause heat up or fire at the connection.

11. Wire routing must be properly arranged so that control board cover is fixed properly. If control board cover is not fixed perfectly, it will cause heat-up or fire at the connection point of terminal, fire or electrical shock.

12. When install or relocate air conditioner, do not let any substance other than the specified refrigerant, eg. air etc. mix into refrigeration cycle (piping). (Mixing of air etc. will cause abnormal high pressure in refrigeration cycle and result in explosion, injury etc.).

13. Do not install outdoor unit near handrail of veranda. When installing air-conditioner unit at veranda of high rise building, child may climb up to outdoor unit and cross over the handrail and causing accident.

14. This equipment must be properly earthed. Earth line must not be connected to gas pipe, water pipe, earth of lightning rod and telephone. Otherwise, it may cause electrical shock in case equipment breakdown or insulation breakdown.

15. Keep away from small children, the thin film may cling to nose and mouth and prevent breathing.

16. Do not use unspecified cord, modified cord, joint cord or extension cord for power supply cord. Do not share the single outlet with other electrical appliances. Poor contact, poor insulation or over current will cause electrical shock or fire.

17. Tighten the flare nut with torque wrench according to specified method. If the flare nut is over-tightened, after a long period, the flare may break and cause refrigerant gas leakage.

18. For R410A models, when connecting the piping, do not use any existing (R22) pipes and flares nuts. Using such same may cause abnormally high pressure in the refrigeration cycle (piping), and possibly result in explosion and injury. In case of using existing (R22) pipes during installation of R410A models, must carry out pump down properly to collect back the refrigerant and oil before installation new unit. Thickness of copper pipes used with R410A must be more than 1/64". Never use copper pipes thinner than 1/64". It is desirable that the amount of residual oil is less than 0.0014 oz/32.8ft.

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. (Removal of refrigeration piping while compressor is operating and valves are opened condition will cause suck-in of air, abnormal high pressure in refrigeration cycle and result in explosion, injury etc.).

21. After completion of installation or service, confirm there is no leakage of refrigerant gas. It may generate toxic gas when the refrigerant contacts with fire.

22. Ventilate if there is refrigerant gas leakage during operation. It may cause toxic gas when the refrigerant contacts with fire.

23. Do not insert your fingers or other objects into the unit, high speed rotating fan may cause injury.

24. Must not use other parts except original parts describe in catalog and manual.

25. Using of refrigerant other than the specified type may cause product damage, burst and injury etc.

1. Do not install the unit at place where leakage of flammable gas may occur. In case gas leaks and accumulates at surrounding of the unit, it may cause fire.

2. Carry out drainage piping as mentioned in installation instructions. If drainage is not perfect, water may enter the room and damage the furniture.

3. Tighten the flare nut with torque wrench according to specified method. If the flare nut is over-tightened, after a long period, the flare may break and cause refrigerant gas leakage.

4. Do not touch outdoor unit air inlet and aluminium fin. It may cause injury.

CAUTION

5. Select an installation location which is easy for maintenance.

6. Pb free solder has a higher melting point than standard solder; typically the melting point is 50°F – 70°F (30°C – 40°C) higher. Please use a high temperature solder iron. In case of the soldering iron with temperature control, please set it to 700 ± 20°F (370 ± 10°C). Pb free solder will tend to splash when heated too high (about 1100°F / 600°C).

7. Power supply connection to the air conditioner. Connect the power supply cord of the air conditioner to the mains using one of the following methods. Power supply point shall be the place where there is ease for access for the power disconnection in case of emergency. In some countries, permanent connection of this room air conditioner to the power supply is prohibited. i. Power supply connection to the receptacle using a power plug. Use an approved 15/16A (1.0 ~ 1.75HP) or 16A (2.0HP) or 20A (2.5HP) power plug with earth pin for the connection to the socket. ii. Power supply connection to a circuit breaker for the permanent connection. Use an approved 16A (1.0 ~ 2.0HP) or 20A (2.5HP) circuit breaker for the permanent connection. It must be a double pole switch with a minimum 3.0 mm contact gap.

8. Do not release refrigerant during piping work for installation, servicing, reinstallation and during repairing a refrigerant parts. Take care of the liquid refrigerant, it may cause frostbite.

9. Installation or servicing work: It may need two people to carry out the installation or servicing work.

10. Do not install this appliance in a laundry room or other location where water may drip from the ceiling, etc.

11. Do not sit or step on the unit, you may fall down accidentally.

12. Do not touch the sharp aluminium fins or edges of metal parts. If you are required to handle sharp parts during installation or servicing, please wear hand glove. Sharp parts may cause injury.

2. Specification

Model

Performance Test Condition ARI ARI

Power Supply

Min. Mid. Max. Min. Mid. Max. Min. Mid. Max. Min. Mid. Max.

Capacity

Running Current A - 3.5 - - 3.1 - - 5.2 - - 4.7 -

Input Power W 250 650 850 250 650 850 250 1.00k 1.15k 250 1.00k 1.15k

EER

Cooling

Power Factor % - 89 - - 91 - - 92 - - 93 -

Indoor Noise (H / L / QLo)

Outdoor Noise (H / L / QLo)

Capacity

Running Current A - 6.1 - - 5.4 - - 6.5 - - 5.8 -

Input Power W 200 1.15k 1.50k 200 1.15k 1.50k 200 1.30k 1.71k 200 1.30K 1.71k

COP

Heating

Power Factor % - 91 - - 93 - - 96 - - 97 -

Indoor Noise (H / L / QLo)

Outdoor Noise (H / L / QLo)

Max Current (A) / Max Input Power (W) 7.0 / 1.57k 7.8 / 1.71k

Starting Current (A) 6.1 6.5

Min Circuit Ampacity 15.0 15.0

Max. Current Protection 15.0 15.0

SEER / HSPF 21.00 / 10.50 20.00 / 10.00

Type Hermetic Motor Hermetic Motor

Compressor

Indoor Fan

Speed

Motor Type Brushless (4 poles) Brushless (4 poles)

Output Power W 700 700

Type Cross-flow fan Cross-flow fan

Material ASG20K1 ASG20K1

Motor Type Transistor (8 poles) Transistor (8 poles)

Input Power W 47.0 - 47.0 47.0 - 47.0

Output Power W 40 40

QLo rpm

Lo rpm

Me rpm

Hi rpm

SHi rpm

Indoor CS-E9NKUAW CS-E12NKUAW

Outdoor CU-E9NKUA CU-E12NKUA

Phase, Hz Single, 60 Single, 60

V 208 230 208 230

kW 1.20 2.49 3.00 1.20 2.49 3.00 1.20 3.51 3.90 1.20 3.51 3.90

BTU/h 4100 8500 10200 4100 8500 10200 4100 12000 13300 4100 12000 13300

W/W 4.80 3.83 3.53 4.80 3.83 3.53 4.80 3.51 3.39 4.80 3.51 3.39

Btu/hW 16.40 13.05 12.00 16.40 13.05 12.00 16.40 12.00 11.55 16.40 12.00 11.55

dB-A 40 / 25 / 20 40 / 25 / 20 43 / 28 / 20 43 / 28 / 20

Power Level dB 56 / - / - 56 / - / - 59 / - / - 59 / - / -

dB-A 47 / - / - 47 / - / - 48 / - / - 48 / - / -

Power Level dB 62 / - / - 62 / - / - 63 / - / - 63 / - / -

kW 1.20 3.27 4.14 1.20 3.27 4.14 1.20 4.05 4.77 1.20 4.05 4.77

BTU/h 4100 11200 14100 4100 11200 14100 4100 13800 16300 4100 13800 16300

W/W 6.00 2.84 2.76 6.00 2.84 2.76 6.00 3.12 2.79 6.00 3.12 2.79

Btu/hW 20.50 9.70 9.40 20.50 9.70 9.40 20.50 10.60 9.50 20.50 10.60 9.50

dB-A 42 / 29 / 26 42 / 29 / 26 44 / 35 / 32 44 / 35 / 32

Power Level dB 58 / - / - 58 / - / - 60 / - / - 60 / - / -

dB-A 46 / - / - 48 / - / - 49 / - / - 49 / - / -

Power Level dB 63 / - / - 63 / - / - 64 / - / - 64 / - / -

Cooling : 620 Heating : 750 Cooling : 720 Heating : 850

Cooling : 930 Heating : 1070 Cooling : 1150 Heating : 1300 Cooling : 1250 Heating : 1390

Cooling : 630 Heating : 970

Cooling : 790 Heating : 1070 Cooling : 1030 Heating : 1250 Cooling : 1270 Heating : 1430 Cooling : 1400 Heating : 1500

Type Propeller Propeller

Material PP PP

Motor Type DC (8 poles) DC (8 poles)

Input Power W - -

Outdoor Fan

Output Power W 40 40

Speed Hi rpm C: 830 H: 780 C: 830 H: 780

Moisture Removal L/h (Pt/h) 0.6 (1.3) 1.2 (2.5)

Indoor Airflow

Outdoor

Airflow

QLo m3/min (ft3/min)

Lo m3/min (ft3/min)

Me m3/min (ft3/min)

Hi m3/min (ft3/min)

SHi m

Hi m

/min (ft3/min)

Cooling : 5.42 (191) Heating : 6.49 (229) Cooling : 6.51 (230) Heating : 7.53 (266) Cooling : 8.80 (311) Heating : 9.81

(346) Cooling : 11.2 (395) Heating : 12.2 (430)

Cooling : 12.29 (434) Heating : 13.13 (464) Cooling : 31.0 (1095) Heating : 31.0 (1095)

Cooling : 5.30 (187) Heating : 8.75 (309) Cooling : 6.98 (246) Heating : 9.78 (345) Cooling : 9.49 (335)

Heating : 11.64 (411)

Cooling : 12.0 (425)

Heating : 13.5 (475) Cooling : 13.36 (472) Heating : 14.23 (502) Cooling : 31.0 (1095) Heating : 31.0 (1095)

Control Device Capillary Tube Capillary Tube

Refrigeration

Cycle

Refrigerant Oil cm3 FV50S (320) FV50S (320)

Refrigerant Type g (oz) R410A, 965 (34.1) R410A, 980 (34.6)

Height(I/D / O/D) mm (inch) 290 (11-7/16) / 540 (21-9/32) 290 (11-7/16) / 540 (21-9/32)

Dimension

Width (I/D / O/D) mm (inch) 870 (34-9/32) / 780 (30-23/32) 870 (34-9/32) / 780 (30-23/32)

Depth (I/D / O/D) mm (inch) 204 (8-1/16) / 289 (11-13/32) 204 (8-1/16) / 289 (11-13/32)

Weight Net (I/D / O/D) kg (lb) 9 (20) 37 (82) 9 (20) 37 (82)

Pipe Diameter (Liquid / Gas) mm (inch) 6.35 (1/4) / 9.52 (3/8) 6.35 (1/4) / 12.70 (1/2)

Standard length m (ft) 7.5 (24.6) 7.5 (24.6)

Length range (min – max) m (ft) 3 (9.8) ~ 20 (65.6) 3 (9.8) ~ 20 (65.6)

I/D & O/D Height different m (ft) 15 (49.2) 15 (49.2)

Piping

Additional Gas Amount g/m (oz/ft) 20 (0.2) 20 (0.2)

Length for Additional Gas m (ft) 7.5 (24.6) 7.5 (24.6)

Drain Hose

Inner Diameter mm (inch) 16.7 (5/8) 16.7 (5/8)

Length mm (inch) 650 (25-5/8) 650 (25-5/8)

Fin Material Aluminium (Pre Coat) Aluminium (Pre Coat)

Indoor Heat

Exchanger

Fin Type Slit Fin Slit Fin

Row x Stage x FPI 2 x 15 x 21 2 x 15 x 21

Size (W x H x L) inch 1 x 12-3/8 x 24 1 x 12-3/8 x 24

Fin Material Aluminium (Blue coated) Aluminium (Blue coated)

Outdoor

Heat

Exchanger

Air Filter

Fin Type Corrugate Fin Corrugate Fin

Row x Stage x FPI 2 x 24 x 17 2 x 24 x 17

Size (W x H x L) inch

1-3/8 x 19-7/18 x 28-1/8 26-7/8

Material Polypropelene Polypropelene

Type One-touch One-touch

Power Supply Outdoor Outdoor

Power Supply Cord A - -

Thermostat - -

Protection Device - -

DRY BULB WET BULB DRY BULB WET BULB

Indoor Operation Range

(Cooling)

Outdoor Operation Range

(Cooling)

Indoor Operation Range

(Heating)

Outdoor Operation Range

(Heating)

1. Cooling capacities are based on indoor temperature of 27°C DRY BULB (80.6°F DRY BULB), 19.0°C WET BULB (66°F WET BULB) and outdoor air temperature of 35°C DRY BULB (95°F DRY BULB), 24°C WET BULB (75.2°F WET BULB)

2. Heating capacities are based on indoor temperature of 20°C Dry Bulb (68°F Dry Bulb) and outdoor air temperature of 7°C Dry Bulb (44.6°F Dry Bulb), 6°C Wet Bulb (42.8°F Wet Bulb)

3. Specifications are subjected to change without prior notice for further improvement.

Maximum 89.6 73.4 89.6 73.4

Minimum 60.8 51.8 60.8 51.8

Maximum 109.4 78.8 109.4 78.8

Minimum 5.0 - 5.0 -

Maximum 86.0 - 86.0 -

Minimum 60.8 - 60.8 -

Maximum 75.2 64.4 75.2 64.4

Minimum 5.0 3.2 5.0 3.2

3. Features

 Inverter Technology

o Wider output power range o Energy saving o Quick Cooling o More precise temperature control

 Environment Protection

o Non-ozone depletion substances refrigerant (R410A)

 Long Installation Piping

o CS/CU-E9/12NK, long piping up to 20 meters

 Easy to use remote control

 Quality Improvement

o Random auto restart after power failure for safety restart operation o Gas leakage protection o Prevent compressor reverse cycle o Inner protector to protect Compressor o Noise prevention during soft dry operation

 Operation Improvement

o Quiet mode to reduce the indoor unit operating sound o Powerful mode to reach the desired room temperature quickly

 Serviceability Improvement

o Breakdown Self Diagnosis function

4. Location of Controls and Components

4.1 Indoor Unit

4.2 Outdoor Unit

4.3 Remote Control

5. Dimensions

5.1 Indoor Unit

5.2 Outdoor Unit

6. Refrigeration Cycle Diagram

7. Block Diagram

8. Wiring Connection Diagram

8.1 Indoor Unit

8.2 Outdoor Unit

9. Electronic Circuit Diagram

9.1 Indoor Unit

9.2 Outdoor Unit

10. Printed Circuit Board

10.1 Indoor Unit

10.1.1 Main Printed Circuit Board

10.1.2 Power Printed Circuit Board

10.1.3 Indicator Printed Circuit Board

10.2 Outdoor Unit

10.2.1 Main Printed Circuit Board

11. Installation Instruction

11.1 Select the Best Location

11.1.1 Indoor Unit

 Do not install the unit in excessive oil fume area

such as kitchen, workshop 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.  Ensure the spaces indicated by arrows from the

wall, ceiling, fence or other obstacles.

 Recommended installation height for indoor unit

shall be at least 8.2 ft.

11.1.2 Outdoor Unit

 If an awning is built over the unit to prevent direct

sunlight or rain, be careful that heat radiation from the condenser is not obstructed.

 There should not be any animal or plant which

could be affected by hot air discharged.

 Keep the spaces indicated by arrows from wall,

ceiling, fence or other obstacles.

 Do not place any obstacles which may cause a

short circuit of the discharged air.

 If piping length is over the [piping length for

additional gas], additional refrigerant should be added as shown in the table.

 Recommended installation height for outdoor unit

should be above the seasonal snow level.

Example: For E9NKUAW If the unit is installed at 32.8 ft distance, the quantity

of additional refrigerant should be 1.64 oz ....

(32.8 - 24.6) ft x 0.2 oz/ft = 1.64 oz.

11.1.3 Indoor/Outdoor Unit Installation Diagram

11.2 Indoor Unit

11.2.1 How to Fix Installation Plate

The mounting wall shall be strong and solid enough to prevent if 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.

B : For left side piping, piping connection for liquid should be about g from this line.

○

: For left side piping, piping connection for gas should be about h from this line.

1 Mount the installation plate on the wall with 5 screws or more (at least 5 screws).

(If mounting the unit on the concrete wall, consider using anchor bolts.) o Always mount the installation plate horizontally by aligning the marking-off line with the thread and using

a level gauge.

2 Drill the piping plate hole with ø2-3/4" hole-core drill.

o Line according to the left and right side of the installation plate. The meeting point of the extended line is

the center of the hole. Another method is by putting measuring tape at position as shown in the diagram above. The hole center is obtained by measuring the distance namely 5-1/6" for left and right hole respectively.

o Drill the piping hole at either the right or the left and the hole should be slightly slanting to the outdoor

side.

11.2.2 To Drill a Hole in the Wall and Install a Sleeve of Piping

1 Insert the piping sleeve to the hole. 2 Fix the bushing to the sleeve. 3 Cut the sleeve until it extrudes about 19/32"

from the wall.

4 Finish by sealing the sleeve with putty or

caulking compound at the final stage.

11.2.3 Indoor Unit Installation

11.2.3.1 For the right rear piping

11.2.3.2 For the right bottom piping

11.2.3.3 For the embedded piping

(This can be used for left rear piping and bottom piping also.)

11.2.4 Connect the Cable to the Indoor Unit

1. The inside and outside connection 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. Connection cable between indoor unit and outdoor unit should be UL listed or CSA approved 4 conductor wires minimum AWG16 in accordance with local electric codes. o Ensure the colour of wires of outdoor unit

and terminal number are the same as the indoor's repectively.

o Earth lead wire shall be Yellow/Green

(Y/G) in colour and shall be longer than other lead wires as shown in the figure for electrical safety in case of the slipping.

11.2.5 Wiring Stripping and connecting requirement

11.2.5.1 Cutting and flaring the piping

1 Please cut using pipe cutter and then remove the burrs. 2 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.

3 Please make flare after inserting the flare nut onto the copper pipes.

11.3 Outdoor Unit

11.3.1 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 A B C D

E9NKUA, E12NKUA 22-7/16" 4-1/8" 23/32" 12-19/32"

11.3.2 Connect the Piping

11.3.2.1 Connecting the piping to indoor

Please make flare after inserting flare nut (locate at joint portion, of tube assembly) onto the copper pipe. (In case of using long piping)

Connect the piping  Align the center of piping and sufficiently tighten

the flare nut with fingers.

 Further tighten the flare nut with torque wrench in

specified torque as stated in the table.

11.3.2.2 Connecting the piping to outdoor

Decide piping length and then cut by using pipe cutter. Remove burrs from cut edge. Make flare after inserting the flare nut (locate at valve) onto the copper pipe. Align center of piping to valves and then tighten with torque wrench to the specified torque as stated in the table.

Do not over tighten, over tightening may cause gas leakage.

Piping size Torque

1/4" 13.3 Ibf.ft 3/8” 31.0 Ibf.ft 1/2" 40.6 Ibf.ft 5/8” 47.9 Ibf.ft 3/4" 73.8 Ibf.ft

11.3.2.3 Connecting the piping to outdoor multi

Decide piping length and then cut by using pipe cutter. Remove burrs from cut edge. Make flare after inserting the flare nut (locate at valve) onto the copper pipe. Align center of piping to valve and then tighten with torque wrench to the specified torque as stated in the table.

11.3.2.4 Gas Leak Checking

Pressure test to system to 400 PSIG with dry nitrogen, in stages. Thoroughly leak check the system. If the pressure holds, release the nitrogen and proceed to section 11.3.3.

11.3.3 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. To make sure micron gauge a value 500 microns and close the low side valve of the charging set and turn off the vacuum pump.

5. Disconnect the vacuum pump house from the service port of the 3-way valve.

6. Tighten the service port caps of the 3-way valve at a torque of 13.3 Ibf.ft with a torque wrench.

7. Remove the valve caps of both of the 2-way valve and 3-way valve. Position both of the valves to “Open” using a hexagonal wrench (5/32").

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