Panasonic CU-2E18NBK Service Manual

Order No: PHAAM1111119A1

Outdoor Unit

CU-2E18NBK

Please file and use this manual together with the service manual for Model No. CS-E9NKKW CS-E12NKKW, Order No. PHAAM1111089C1.

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. Any attempt to service or repair the product or 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.

TABLE OF CONTENTS

1.	Safety Precautions.............................................		3
2.	Specifications.....................................................		5
	2.1	CU-2E18NBK ...............................................	5
3.	Dimensions.........................................................		8
4.	Refrigeration Cycle Diagram.............................		9
5.	Block Diagram ..................................................		10
6.	Wiring Connection Diagram............................		11
7.	Electronic Circuit Diagram ..............................		12
8.	Printed Circuit Board .......................................		13
	8.1	Main Printed Circuit Board .........................	13
	8.2	Noise Filter Printed Circuit Board...............	14
	8.3	Display Printed Circuit Board .....................	14
9.	Installation Information ...................................		15
	9.1	Check Points ..............................................	15

10. Installation Instruction.....................................		16
10.1	Select The Best Location ...........................	16
10.2	Install The Outdoor Unit .............................	17
10.3	Connect the Piping.....................................	17
10.4	Evacuation of the Equipment .....................	18

10.5Connect The Cable To The Outdoor

		Unit .............................................................	19
10.6		Heat Insulation ...........................................	19
11.	Operation Control.............................................		20
11.1		Cooling Operation ......................................	20
11.2		Heating Operation ......................................	21
12.	Simultaneous Operation Control....................		22
13.	Protection Control............................................		23
13.1		Freeze Prevention control (Cool) ...............	23
13.2		Dew Prevention control (Cool) ...................	23

13.3Electronic Parts Temperature Rise

Protection 1 (Cool) .....................................

23

© Panasonic HA Air-Conditioning (M) Sdn. Bhd. 2011. Unauthorized copying and distribution is a violation of law.

13.4Electronic Parts Temperature Rise

	Protection 2 (Cool)......................................	23
13.5	Cooling overload control (Cool)..................	24
13.6	Heating overload control (Heat) .................	24

13.7Extreme Low Temperature Compressor low

		pressure protection control (Heat)..............	24
13.8		Deice Control..............................................	25
13.9		Time Delay Safety Control
		(Restart Control) .........................................	25
13.10		30 seconds Force Operation ......................	25
13.11		Total Current Control..................................	25
13.12		IPM (power transistor) Protection
		Control ........................................................	25
13.13		Compressor Protection Control
		(Gas leak detection control 1) ....................	26
13.14		Compressor Protection Control
		(Gas leak detection control 2) ....................	26
13.15		Valve close detection control......................	26
13.16		Compressor discharge high pressure
		protection control ........................................	26
14. Servicing Mode.................................................			27
14.1		CU-2E18NBK .............................................	27
15. Troubleshooting Guide....................................			29
15.1		Self Diagnosis Function..............................	29
16. Disassembly and Assembly Instructions ......			32
16.1	Outdoor Unit Removal Procedure ..............		32
17. Technical Data ..................................................			35
17.1		Operation Characteristics...........................	35
18. Exploded View and Replacement Parts
List		.....................................................................	55

2

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

The items to be followed are classified by the symbols:

This symbol denotes item that is PROHIBITED from doing.

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.

WARNING

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

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 dealer or specialist for installation and servicing. If installation or 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 install 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 electric 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.

3

18.For R410A models, when connecting the piping, do not use any existing (R22) pipes and flare nuts. Using such same may cause abnormally high pressure in the refrigeration cycle (piping), and possibly result in explosion and injury. Use only R410A materials.

Thickness of copper pipes used with R410A must be more than 0.8mm. Never use copper pipes thinner than 0.8mm. It is desirable that the amount of residual oil is less than 40 mg/10m.

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 or 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 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 described in catalog and manual.

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

CAUTION

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.

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.

Power supply cord shall be UL listed or CSA approved 4 conductor with minimum AWG12 wires.

Power supply point should be in an easily accessible place for power disconnection in case of emergency. In some countries, permanent connection of this air conditioner to the power supply is prohibited.

Fix power supply connection to a circuit breaker for the permanent connection.

Use NRTL approved fuse or circuit breaker (rating refers to name plate) for the permanent connection.

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.

4

2. Specifications

2.1CU-2E18NBK

	Item			Unit	OUTDOOR UNIT
Indoor Unit Combination					3.2kW + 3.2kW
Power Source					1 Phase, 208 – 230V, 60Hz (Power supply from
					outdoor unit)
	Capacity			kW	4.89 (2.10	~ 5.86)
				BTU/h	16700 (7200 ~ 20000)
			Running Current	A	7.6 - 6.9
Cooling Operation	Electrical		Power Input	kW	1.45 (0.39	~ 1.84)
	Data		EER	W/W	3.37 (5.38	~ 3.18)
				BTU/hW	11.50 (18.45 ~ 10.85)
	Noise		Sound Pressure Level	dB-A	48
			Sound Power Level	dB	62
	Capacity			kW	5.94 (2.11	~ 7.20)
				BTU/h	20200 (7200 ~ 24600)
			Running Current	A	9.0 - 8.1
Heating Operation	Electrical		Power Input	kW	1.85 (0.42	~ 2.29)
	Data		COP	W/W	3.21 (5.02	~ 3.14)
				BTU/hW	10.90 (17.15 ~ 10.75)
	Noise		Sound Pressure Level	dB-A	49
			Sound Power Level	dB	63
Maximum Current				A	13.6
Starting Current				A	9.0
Minimum Circuit Ampacity				A	20
	Height			mm (inch)	795 (31-5/16)
Dimension
	Width			mm (inch)	875 + 95 (34-15/32 + 3-3/4)
	Depth			mm (inch)	320 (12-5/8)
Net Weight				kg (lb)	69 (152)
Connection cable					3 + 1 (Earth) ø1.5 mm2
Pipe Length Range (1 room)				m (ft)	3 ~ 25 (9.8 ~ 82.0)
Maximum Pipe Length (Total Room)				m (ft)	50 (164.0)
Refrigerant Pipe Diameter	Liquid Side			mm (inch)	6.35 (1/4)
	Gas Side			mm (inch)	9.52 (3/8)
	Type				Hermetic Motor (Rotary)
Compressor
	Motor Type				DC Brushless (4-poles)
	Rated Output			W	1.30k
	Type				Propeller Fan
Air Circulation
	Motor Type				DC Brushless (8-poles)
	Rated Output			W	60
Fan Speed	High			RPM	570
	Type				Plate fin configuration forced draft type
	Tube Material				Copper
Heat Exchanger
	Fin Material				Aluminum
	Row/Stage				2/36
	FPI				19

5

	Item		Unit		OUTDOOR UNIT
Air Volume	High		m3/min (ft3/min)		37.2 (1313)
Refrigerant Control Device					Expansion Valve
Refrigerant Oil					FV50S
Refrigerant (R410A)			g (oz)		1.92k (67.8)
				Dry Bulb		Wet Bulb
	Cooling	Maximum	°C (°F)	32 (89.6)		23 (73.4)
Indoor Operation Range		Minimum	°C (°F)	16 (60.8)		11 (51.8)
	Heating	Maximum	°C (°F)	30 (86.0)		—
		Minimum	°C (°F)	16 (60.8)		—
	Cooling	Maximum	°C (°F)	43 (109.4)		26 (78.8)
Outdoor Operation Range		Minimum	°C (°F)	16 (60.8)		11 (51.8)
	Heating	Maximum	°C (°F)	24 (75.2)		18 (64.4)
		Minimum	°C (°F)	-15 (5.0)		-16 (3.2)

Note

Specifications are subject to change without notice for further improvement.

Multi split combination possibility:

o A single outdoor unit enables air conditioning of up to two separate rooms for CU-2E18NBK.

								Outdoor Unit
								CU-2E18NBK
								A		B
	Wall			2.8 kW		CS-E9NKKW		•		•
				3.2 kW		CS-E12NKKW		•		•
Capacity range of connectable indoor units						From 5.6 kW to 6.4 kW
Length			1 room maximum pipe length (m (ft))			25 (82.0)
			Allowable elevation (m (ft))			15 (49.2)
			Total allowable pipe length (m (ft))			50 (164.0)
Piping
			Total pipe length for maximum chargeless length (m (ft))			20 (65.6)
			Additional gas amount over chargeless length (g/m (oz/ft))			20 (0.2)
							Note: “•” : Available
Remarks for CU-2E18NBK
1. At least two indoor units must be connected.
2. The total nominal cooling capacity of indoor untis that will be connected to outdoor unit must be within connectable capacity range of
indoor unit.
(as shown in the table above)
Example: The indoor units’ combination below is possible to connect to CU-2E18NBK. (Total nominal capacity of indoor units is between
5.6 kW to 6.4 kW)
1) Two CS-E9NKKW only. (Total nominal cooling capacity is 5.6 kW)
2) One CS-E9NKKW and one CS-E12NKKW. (Total nominal cooling capacity is 6.0 kW)

Specifications are subject to change without notice for further improvement.

6

	Indoor unit combination		Operation	Cooling Capacity (kW)		Input Power (W)		Current (A)	Current (A)	Moisture
										Removal
Outdoor Unit	Operation	Class (kW)	Mode	Rating	Min ~ Max	Rating	Min ~ Max	208V	230V	Volume
										(L/h)
	One-room	2.8	Cooling	2.82	1.81 ~ 3.27	850	390 ~ 1020	4.5	4.1	0.5
	Operation	3.2		3.21	1.85 ~ 3.75	1000	390 ~ 1230	5.2	4.7	0.6
CU-2E18NBK
	Two-room	2.8 + 2.8		4.89	2.09 ~ 5.86	1450	390 ~ 1920	7.6	6.9	0.5 + 0.5
			Cooling
		2.8 + 3.2		4.89	2.10 ~ 5.86	1450	390 ~ 1870	7.6	6.9	0.5 + 0.6
	Operation
		3.2 + 3.2		4.89	2.10 ~ 5.86	1450	390 ~ 1840	7.6	6.9	0.6 + 0.6
	Indoor unit combination		Operation	Cooling Capacity (BTU/h)		Input Power (W)		Current (A)	Current (A)	Moisture
										Removal
Outdoor Unit	Operation	Class (kW)	Mode	Rating	Min ~ Max	Rating	Min ~ Max	208V	230V	Volume
										(pt/h)
	One-room	2.8	Cooling	9600	6200 ~ 11200	850	390 ~ 1020	4.5	4.1	1.1
	Operation	3.2		10900	6300 ~ 12800	1000	390 ~ 1230	5.2	4.7	1.3
CU-2E18NBK
	Two-room	2.8 + 2.8		16700	7100 ~ 20000	1450	390 ~ 1920	7.6	6.9	1.1 + 1.1
			Cooling
		2.8 + 3.2		16700	7200 ~ 20000	1450	390 ~ 1870	7.6	6.9	1.1 + 1.3
	Operation
		3.2 + 3.2		16700	7200 ~ 20000	1450	390 ~ 1840	7.6	6.9	1.3 + 1.3

Specifications are subject to change without notice for further improvement.

	Outdoor Unit	Indoor unit combination		Operation	Heating Capacity (kW)		Input Power (W)		Current (A)	Current (A)
		Operation	Class (kW)	Mode	Rating	Min ~ Max	Rating	Min ~ Max	208V	230V
		One-room	2.8	Heating	4.02	1.87 ~ 4.61	1150	440 ~ 1450	5.9	5.4
		Operation	3.2		4.50	1.91 ~ 5.12	1300	440 ~ 1630	6.6	6.0
	CU-2E18NBK
		Two-room	2.8 + 2.8		5.94	2.09 ~ 7.20	1850	420 ~ 2310	9.0	8.1
				Heating
			2.8 + 3.2		5.94	2.10 ~ 7.20	1850	420 ~ 2290	9.0	8.1
		Operation
			3.2 + 3.2		5.94	2.11 ~ 7.20	1850	420 ~ 2290	9.0	8.1
	Outdoor Unit	Indoor unit combination		Operation	Heating Capacity (BTU/h)		Input Power (W)		Current (A)	Current (A)
		Operation	Class (kW)	Mode	Rating	Min ~ Max	Rating	Min ~ Max	208V	230V
		One-room	2.8	Heating	13700	6400 ~ 15700	1150	440 ~ 1450	5.9	5.4
		Operation	3.2		15300	6500 ~ 17500	1300	440 ~ 1630	6.6	6.0
	CU-2E18NBK
		Two-room	2.8 + 2.8		20200	7100 ~ 24600	1850	420 ~ 2310	9.0	8.1
				Heating
			2.8 + 3.2		20200	7200 ~ 24600	1850	420 ~ 2290	9.0	8.1
		Operation
			3.2 + 3.2		20200	7200 ~ 24600	1850	420 ~ 2290	9.0	8.1

Specifications are subject to change without notice for further improvement.

7

3. Dimensions

8

4. Refrigeration Cycle Diagram

9

5. Block Diagram

10

6. Wiring Connection Diagram

11

7. Electronic Circuit Diagram

12

8. Printed Circuit Board

8.1Main Printed Circuit Board

13

8.2Noise Filter Printed Circuit Board

8.3Display Printed Circuit Board

14

9. Installation Information

9.1Check Points

QUICK GUIDE PIPING AND ELECTRICAL SPECIFICATION

Piping size

Min.

Max.

Min. total

Addi-

Power

Indoor (ID) & Outdoor

Refrige-

Standard

Max.

pipe

from

Max.

pipe

OD-ID

(OD) units: Possible

pipe

Eleva-

length

OD to

total

length

tional

Power

supply

connection

Combination Patterns

rant

Gas

Liquid

length

tion

for

each

length

for

refrige-

supply

wire

wire size

each

ID

additional

rant

size

ID unit

unit

gas

Outdoor (OD):

CU-2E18NBK

Indoor (ID): 2 UNITS

OF CS-E9NKKW

Outdoor (OD):

208/230V

CU-2E18NBK

Ø3/8”

Ø1/4”

Indoor (ID): 2 UNITS

R410A

7.5 m

15 m

3m

25 m

50 m

20 m

20 g/m

60 Hz

AWG12

AWFG16

OF CS-E12NKKW

(Ø9.52mm)

(Ø6.35mm)

MCA20A

Outdoor (OD):

MOP 25A

CU-2E18NBK

Indoor (ID): 1 UNIT

OF CS-E9NKKW +

1 UNIT OF

CS-E12NKKW

Example:

If total piping length of all installed indoor units is at 22.5m, the quantity of additional refrigerant should be 50 g ......

(22.5 - 20) m x 20 g/m = 50 g

15

10. Installation Instruction

10.1 Select The Best Location

10.1.1Outdoor 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.

Recommended installation height for outdoor unit should be above the seasonal snow level.

Refrigerant piping size

Outdoor Unit		CU-2E18***
Liquid - side	ø1/4” (ø6.35mm) t0.8mm
Gas - side	ø3/8” (ø9.52mm) t0.8mm
Outdoor Unit		CU-2E18***
Min. total piping length for additional gas		20m

If total piping length of all indoor units exceeds the minimum length listed above, additionally charge with 20g of refrigerant (R410A) for each additional meter of piping.

Allowable piping length

Outdoor Unit			CU-2E18***
Allowable piping length of each indoor unit (min. ~ max.)			3 m ~ 25 m
Allowable total piping length of all indoor unit			50 m or less
Height difference between indoor and outdoor unit	Outdoor unit located on upper side		15 m or less
	Outdoor unit located otherwise		7.5 m or less
Height difference between indoor unit	Outdoor unit located on upper side		7.5 m or less
	Outdoor unit located otherwise		15 m or less

16

Outdoor Unit Installation Guidelines

Where a wall or other obstacle is in the path of outdoor unit’s intake or exhaust airflow, follow the installation guidelines below.

For any of the below installation patterns, the wall height on the exhaust side should be 1200mm or less.

10.2 Install The Outdoor Unit

After selecting the best location, start installation to Indoor/Outdoor Unit Installation Diagram.

1Fix the unit on concrete or rigid frame firmly and horizontally by bolt nut (ø10 mm).

2When installing at roof, please consider strong wind and earthquake.

Please fasten the installation stand firmly with bolt or nails.

Model	A	B	C	D
CU-2E18***	613 mm	131 mm	16 mm	360.5 mm

10.3 Connect the Piping

Remove the control board cover (resin) from the unit by loosening three screws

Connecting The Piping To Outdoor Unit

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" [6.35 mm]	[18 N•m (1.8 kgf.m)]
3/8" [9.52 mm]	[42 N•m (4.3 kgf.m)]
1/2" [12.7 mm]	[55 N•m (5.6 kgf.m)]
5/8" [15.88 mm]	[65 N•m (6.6 kgf.m)]
3/4" [19.05 mm]	[100 N•m (10.2 kgf.m)]

17

CUTTING AND FLARING THE PIPING

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

2Remove the burrs by using reamer. If burrs is not removed, gas leakage may be caused. Turn the piping end down to avoid the metal powder entering the pipe.

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

10.4 Evacuation of the Equipment

WHEN INSTALLING AN AIR CONDITIONER, BE SURE TO EVACUATE THE AIR INSIDE THE INDOOR UNIT AND PIPES in the following procedure.

1Connect a charging hose with a push pin to the Low side of a charging set and the service port of the 3-way valve.

o Be sure to connect the end of the charging hose with the push pin to the service port.

2Connect the center hose of the charging set to a vacuum pump.

3Turn on the power switch of the vacuum pump and make sure that the needle in the gauge moves from 0 cmHg (0 MPa) to -76 cmHg (-0.1 MPa). Then evacuate the air approximately ten minutes.

4Close the Low side valve of the charging set and turn off the vacuum pump. Make sure that the needle in the gauge does not move after approximately five minutes.

Note: BE SURE TO TAKE THIS PROCEDURE IN ORDER TO AVOID REFRIGERENT GAS LEAKAGE.

5Disconnect the charging hose from the vacuum pump and from the service port of the 3-way valve.

6Tighten the service port caps of gas side 3-way valve at a torque of 18 N•m with a torque wrench.

7Remove the valve caps of both of the gas side and liquid side 3-way valve. Position both of the valves to “OPEN” using a hexagonal wrench (4 mm).

8Mount valve caps onto the gas side and liquid side of the 3-way valve.

o Be sure to check for gas leakage.

If gauge needle does not move from 0 cmHg (0 MPa) to -76 cmHg (-0.1 MPa), in step e above take the following measure:

-If the leak stops when the piping connections are tightened further, continue working from step e.

-If the leak does not stop when the connections are retightened, repair location of leak.

-Do not release refrigerant during piping work for installation and reinstallation.

-Take care of the liquid refrigerant, it may cause frostbite.

18