Mitsubishi Electronics MXZ-8C60NA Installation Manual

Air-Conditioners OUTDOOR UNIT

MXZ-8C60NA

HFC

utilized

R410A

INSTALLATION MANUAL
	FOR INSTALLER

For safe and correct use, please read this installation manual thoroughly before installing the air-conditioner unit.

MANUEL D’INSTALLATION
	POUR L’INSTALLATEUR

Veuillez lire le manuel d’installation en entier avant d’installer ce climatiseur pour éviter tout accident et vous assurer d’une utilisation correcte.

MANUAL DE INSTALACIÓN
	PARA EL INSTALADOR

Para un uso seguro y correcto, lea detalladamente este manual de instalación antes de montar la unidad de aire acondicionado.

English

Français

Español

Contents

1.	Safety precautions. . . .	. . . .	.	. . . . . . . .				2	6.	Drainage piping work.			. . .	. .	. . .	. . . .	. .	. .						10
2.	Installation diagram & parts.. .			. . . . . . . . . . . .	.	.	.	3	7.	Electrical work. .		. .	.	.	. .	. .	.	.	.	. .	.	.	.	10
3.	Installation location. .	. . .		. . . . . . . . . . . .	.			4	8.	Test run. .	. . . .		. .	.	. .	. .	.	.	.	.	.			16
4.	Installing the outdoor unit . .		.	. . . . . . . . . . . .	.	.	.	6	9.	Special Functions .		.	. .	.	. .	. .	.	.	.	.	.	.	. . .	17
5.	Installing the refrigerant piping .			. . . . . . . . . . . .	.	.	. . .	6

Confirmation of parts attached

In addition to this manual, the following parts are supplied with the outdoor unit.

They are used for grounding the S terminals of transmission terminal blocks TB3, TB7. For details refer to “7. Electrical work”.

Grounding lead wire (× 2)

1. Safety precautions

►Before installing the unit, make sure you read all the “Safety precautions”.

►Please report to or take consent by the supply authority before connection to the system.

Warning:

Describes precautions that must be observed to prevent danger of injury or death to the user.

Caution:

Describes precautions that must be observed to prevent damage to the unit.

After installation work has been completed, explain the “Safety Precautions” use, and maintenance of the unit to the customer according to the information in the Operation Manual and perform the test run to ensure normal operation. Both the Installation Manual and Operation Manual must be given to the user for keeping. These manuals must be passed on to subsequent users.

: Indicates a part which must be grounded.

Warning:

Carefully read the labels affixed to the main unit.

Warning:

•The unit must not be installed by the user. Ask a dealer or an authorized technician to install the unit. If the unit is installed incorrectly, water leakage, electric shock, or fire may result.

•For installation work, follow the instructions in the Installation Manual and use tools and pipe components specifically made for use with R410A refrigerant.

•The R410A refrigerant in the HFC system is pressurized 1.6 times the pressure of usual refrigerants. If pipe components not designed for R410A refrigerant are used and the unit is not installed correctly, the pipes may burst and cause damage or injuries. In addition, water leakage, electric shock, or fire may result.

•The unit must be installed according to the instructions in order to minimize the risk of damage from earthquakes, typhoons, or strong winds. An incorrectly installed unit may fall down and cause damage or injuries.

•The unit must be securely installed on a structure that can sustain its weight. If the unit is mounted on an unstable structure, it may fall down and cause damage or injuries.

•If the air conditioner is installed in a small room, measures must be taken to prevent the refrigerant concentration in the room from exceeding the safety limit in the event of refrigerant leakage. Consult a dealer regarding the appropriate measures to prevent the allowable concentration from being exceeded.

Should the refrigerant leak and cause the concentration limit to be exceeded, hazards due to lack of oxygen in the room may result.

•Ventilate the room if refrigerant leaks during operation. If refrigerant comes into contact with a flame, poisonous gases will be released.

•All electric work must be performed by a qualified technician according to local regulations and the instructions given in this manual. The units must be powered by dedicated power lines and the correct voltage and circuit breakers must be used. Power lines with insufficient capacity or incorrect electrical work may result in electric shock or fire.

•Be sure to connect the power supply cords and the connecting wires for the indoor units, outdoor units, and branch boxes directly to the units (no intermediate connections).

Intermediate connections can lead to communication errors if water enters the cords or wires and causes insufficient insulation to ground or a poor electrical contact at the intermediate connection point.

(If an intermediate connection is necessary, be sure to take measures to prevent water from entering the cords and wires.)

•Use C1220 copper phosphorus, for copper and copper alloy seamless pipes, to connect the refrigerant pipes. If the pipes are not connected correctly, the unit will not be properly grounded and electric shock may result.

•Use only specified cables for wiring. The wiring connections must be made securely with no tension applied on the terminal connections. Also, never splice the cables for wiring (unless otherwise indicated in this document). Failure to observe these instructions may result in overheating or a fire.

•The terminal block cover panel of the outdoor unit must be firmly attached. If the cover panel is mounted incorrectly and dust and moisture enter the unit, electric shock or fire may result.

•When installing or relocating, or servicing the outdoor unit, use only the specified refrigerant (R410A) to change the refrigerant lines. Do not mix it with any other refrigerant and do not allow air to remain in the lines.

If air is mixed with the refrigerant, then it can be the cause of abnormal high pressure in the refrigerant line, and may result in an explosion and other hazards. The use of any refrigerant other than that specified for the system will cause mechanical failure or system malfunction or unit breakdown. In the worst case, this could lead to a serious impediment to securing product safety.

•Use only accessories authorized by Mitsubishi Electric and ask a dealer or an authorized technician to install them. If accessories are incorrectly installed, water leakage, electric shock, or fire may result.

•Do not alter the unit. Consult a dealer for repairs. If alterations or repairs are not performed correctly, water leakage, electric shock, or fire may result.

•The user should never attempt to repair the unit or transfer it to another location.

If the unit is installed incorrectly, water leakage, electric shock, or fire may result. If the air conditioner must be repaired or moved, ask a dealer or an authorized technician.

•After installation has been completed, check for refrigerant leaks. If refrigerant leaks into the room and comes into contact with the flame of a heater or portable cooking range, poisonous gases will be released.

1.1. Before installation

Caution:

•Do not use the unit in an unusual environment. If the air conditioner is installed in areas exposed to steam, volatile oil (including machine oil), or sulfuric gas, areas exposed to high salt content such as the seaside, or areas where the unit will be covered by snow, the performance can be significantly reduced and the internal parts can be damaged.

•Do not install the unit where combustible gases may leak, be produced, flow, or accumulate. If combustible gas accumulates around the unit, fire or explosion may result.

•The outdoor unit produces condensation during the heating operation. Make sure to provide drainage around the outdoor unit if such condensation is likely to cause damage.

•When installing the unit in a hospital or communications office, be prepared for noise and electronic interference. Inverters, home appliances, highfrequency medical equipment, and radio communications equipment can cause the air conditioner to malfunction or breakdown. The air conditioner may also affect medical equipment, disturbing medical care, and communi-

cations equipment, harming the screen display quality.

1.2. Before installation (relocation)

Caution:

•Be extremely careful when transporting the units. 2 or more persons are needed to handle the unit, as it weighs 20 kg, 44 lbs or more. Do not grasp the packaging bands. Wear protective gloves to remove the unit from the packaging and to move it, as you can injure your hands on the fins or the edge of other parts.

•Be sure to safely dispose of the packaging materials. Packaging materials, such as nails and other metal or wooden parts may cause stabs or other injuries.

•The base and attachments of the outdoor unit must be periodically checked for looseness, cracks or other damage. If such defects are left uncorrected, the unit may fall down and cause damage or injuries.

•Do not clean the air conditioner unit with water. Electric shock may result.

•Tighten all flare nuts to specification using a torque wrench. If tightened too much, the flare nut can break after an extended period and refrigerant can leak out.

2

1. Safety precautions

1.3. Before electric work

Caution:

• Be sure to install circuit breakers. If not installed, electric shock may result.

IMPORTANT

Make sure that the current leakage breaker is one compatible with higher harmonics.

Always use a current leakage breaker that is compatible with higher harmonics as this unit is equipped with an inverter.

The use of an inadequate breaker can cause the incorrect operation of inverter.

•For the power lines, use standard cables of sufficient capacity. Otherwise, a short circuit, overheating, or fire may result.

•When installing the power lines, do not apply tension to the cables. If the connections are loosened, the cables can snap or break and overheating or fire may result.

•Be sure to ground the unit. Do not connect the ground wire to gas or water pipes, lighting rods, or telephone grounding lines. If the unit is not properly grounded, electric shock may result.

•Use circuit breakers (ground fault interrupter, isolating switch (+B fuse), and molded case circuit breaker) with the specified capacity. If the circuit breaker capacity is larger than the specified capacity, breakdown or fire may result.

1.4. Before starting the test run

Caution:

•Turn on the main power switch more than 12 hours before starting operation.

Starting operation just after turning on the power switch can severely damage the internal parts. Keep the main power switch turned on during the operation season.

•Before starting operation, check that all panels, guards and other protective parts are correctly installed. Rotating, hot, or high voltage parts can cause injuries.

•Do not touch any switch with wet hands. Electric shock may result.

•Do not touch the refrigerant pipes with bare hands during operation. The refrigerant pipes are hot or cold depending on the condition of the flowing refrigerant. If you touch the pipes, burns or frostbite may result.

•After stopping operation, be sure to wait at least 5 minutes before turning off the main power switch. Otherwise, water leakage or breakdown may result.

1.5. Using R410A refrigerant air conditioners

Caution

•Use C1220 copper phosphorus, for copper and copper alloy seamless pipes, to connect the refrigerant pipes. Make sure the insides of the pipes are clean and do not contain any harmful contaminants such as sulfuric compounds, oxidants, debris, or dust. Use pipes with the specified thickness. (Refer to

page 6) Note the following if reusing existing pipes that carried R22 refrigerant.

-Replace the existing flare nuts and flare the flared sections again.

-Do not use thin pipes. (Refer to page 6)

•Store the pipes to be used during installation indoors and keep both ends of the pipes sealed until just before brazing. (Leave elbow joints, etc. in their packaging.) If dust, debris, or moisture enters the refrigerant lines, oil deterioration or compressor breakdown may result.

•Use ester oil, ether oil, alkylbenzene oil (small amount) as the refrigeration oil applied to the flared sections. If mineral oil is mixed in the refrigeration oil, oil deterioration may result.

• Do not use refrigerant other than R410A refrigerant. If another refrigerant is used, the chlorine will cause the oil to deteriorate.

• Use the following tools specifically designed for use with R410A refrigerant. The following tools are necessary to use R410A refrigerant. Contact your nearest dealer for any questions.

	Tools (for R410A)
Gauge manifold	Flare tool
Charge hose	Size adjustment gauge
Gas leak detector	Vacuum pump adapter
Torque wrench	Electronic refrigerant charging scale

• Be sure to use the correct tools. If dust, debris, or moisture enters the refrigerant lines, refrigeration oil deterioration may result.

• Do not use a charging cylinder. If a charging cylinder is used, the composition of the refrigerant will change and the efficiency will be lowered.

2. Installation diagram & parts

Branch box

5-branches type

3-branches type

Outdoor unit

Fig. 2-1

2.1. Before installation (Fig. 2-1)

This installation manual is only for the outdoor unit installation. In installing the indoor units and branch box, refer to the installation manual attached to each unit.

Any structural alterations necessary for the installation must comply with the local building code requirements.

This diagram is intended to show the configuration of accessories.

For actual installation, the outdoor unit is to be turned 180°.

Units should be installed by licensed contractor according to local code requirement.

Note:

The dimensions given along the arrows above are required to guarantee the air conditioner’s performance. Install the unit in as wide a place as possible for later service or repairs.

Parts to be locally procured

	Branch box/outdoor unit connecting wire (3-core)	1
	Extension pipe	1
	Wall hole sleeve	1
	Wall hole cover	1
	Pipe fixing band	2 to 7
	(The quantity depends on the pipe length.)
	Fixing screw for 4 × 20 mm (13/16")	2 to 7
	(The quantity depends on the pipe length.)
	Piping tape	1
	Putty	1
	Refrigeration oil	1
	Power supply cord (2-core, Refer to 7.3. Wiring transmission cables)	1

3

3. Installation location

(inch)

13	41-
	11/32

52-11/16

8-7/8 23-5/8 -9/16 14

Fig. 3-1

A

Fig. 3-2

Fig. 3-3

B

Fig. 3-4

4

3.1. Refrigerant pipe

Refer to 5.2. Pipe length and height difference.

3.2. Choosing the outdoor unit installation location

•Avoid locations exposed to direct sunlight or other sources of heat.

•Select a location from which noise emitted by the unit will not inconvenience neighbors.

•Select a location permitting easy wiring and pipe access to the power source and indoor unit.

•Avoid locations where combustible gases may leak, be produced, flow, or accumulate.

•Note that water may drain from the unit during operation.

•Select a level location that can bear the weight and vibration of the unit.

•Avoid locations where the unit can be covered by snow. In areas where heavy snow fall is anticipated, special precautions such as raising the installation location or installing a hood on the air intake must be taken to prevent the snow from blocking the air intake or blowing directly against it. This can reduce the airflow and a malfunction may result.

•Avoid locations exposed to oil, steam, or sulfuric gas.

•Use the transportation handles of the outdoor unit to transport the unit. If the unit is carried from the bottom, hands or fingers may be pinched.

3.3.Outline dimensions (Outdoor unit) (Fig. 3-1)

3.4.Constraints on indoor unit and branch box installation

You should note that indoor units that can be connected to this outdoor unit have the following constraints.

•Indoor units with model numbers 06, 09, 12, 15, 18, 24, 30, and 36 can be connected.

•For the number of units that can be connected, refer to Table 1 below.

•The total rated capacity (cooling) of the connected indoors units (refer to Table 2)

must not exceed 130% of the outdoor unit capacity (refer to the capacity range of connected units in Table 1).

In addition, up to 2 branch boxes can be connected.

Table 1: Number of units that can be connected and capacity range of connected units

Outdoor unit model name	Number of units that can	Capacity range of
	be connected	connected units
MXZ-8C60	2 – 8 (6) units *1 *2	12 – 78 kBTU/h

*1 The number enclosed in parentheses is the maximum number of units that can be connected when 1 or more PLA-A·EA7 units is connected.

*2 For each connected branch box,

1.When 2 MVZ-series units are connected, other indoor units cannot be connected. 2.When 1 MVZ-series unit is connected, only 1 SEZ-series unit or 1 PEAD-series unit can be connected among the remaining indoor units and the total rated capacity of the connected indoors units, including the MVZ-series unit, must not exceed 100%

of the outdoor unit capacity.

3.When 1 or more SEZ-series units or PEAD-series units are connected, the total rated capacity of the connected indoors units, including the SEZ-series units and PEAD-series units, must not exceed 100% of the outdoor unit capacity. (However, restriction 3 applies only when a 5-branch type branch box is connected.)

For connections other than those specified in 1 and 2, including connections with

MVZ-series units, consult a dealer.

Table 2: Rated capacity (cooling) of the indoor units

Model No.				06	09	12	15	18	24	30	36
Rated capacity (Cooling) (kBTU/h)				6	9	12	15	18	24	30	36
Example: MXZ-8C60
MSZ-24 = 24
	+
SEZ-15 = 15
	+	Total rated capacity
SEZ-15 = 15
		72 ≤ 78 kBTU/h
	+
SLZ-09 =	9
	+
SLZ-09 =	9

Combinations in which the total capacity of indoor units exceeds the capacity of the outdoor unit will reduce the cooling capacity of each indoor unit below their rated cooling capacity. Thus, combine indoor units with an outdoor unit within the outdoor unit’s capacity, if possible.

3.5. Ventilation and service space

Note:

The dimensions given along the arrows above are required to guarantee the air conditioner’s performance. Install the unit in as wide a place as possible for later service or repairs.

3.5.1. Windy location installation

When installing the outdoor unit on a rooftop or other location unprotected from the wind, situate the air outlet of the unit so that it is not directly exposed to strong winds.

Strong wind entering the air outlet may impede the normal airflow and a malfunction may result.

The following shows 3 examples of precautions against strong winds.

1Face the air outlet towards the nearest available wall about 50 cm (19-11/16”) away from the wall. (Fig. 3-2)

2 Install an optional air guide if the unit is installed in a location where strong winds from a typhoon, etc. may directly enter the air outlet. (Fig. 3-3)

A Air guide

3Position the unit so that the air outlet blows perpendicularly to the seasonal wind direction, if possible. (Fig. 3-4)

B Wind direction

3. Installation location

-29/32 5

Fig. 3-5

-29/32 5

* -3/8 39

Fig. 3-9

		-11/16
19
.
Max

	39-3/8	7
		-
			7/8
				7
				-
	-13/16				7/8
	11
Fig. 3-6				Fig. 3-7
		-11/16
	19
	.
	Max

9
-
	27/32

9
-
	27/32

Fig. 3-10

1/16-59

-11/16 19

			-13/16
		11
		.
		Max
-			1/16
59	1/16		-
			59
			-11/16
			19

Fig. 3-12

* -1/16 59

Fig. 3-13

-13/16 11

(inch)

* -3/8 39

Fig. 3-8

-13/16 11

Fig. 3-11

-11/16 19 * -1/16 59

Fig. 3-14

-29/32 5

* -24/32 78

	-5/8
-3/8	23
39

Fig. 3-15

-5/8 23

-1/16 59

Fig. 3-16

-11/16 19

* -4/32 118

59-1/16

Fig. 3-17

29/32-5

-1/2 31

3.5.2. When installing a single outdoor unit

Minimum dimensions are as follows, except for Max., meaning Maximum dimensions, indicated.

Refer to the figures for each case.

1 Obstacles at rear only (Fig. 3-5)

2 Obstacles at rear and above only (Fig. 3-6) 3 Obstacles at rear and sides only (Fig. 3-7)

4Obstacles at front only (Fig. 3-8)

*When using the optional air outlet guides, the clearance is 19-11/16” (500 mm) or more.

5 Obstacles at front and rear only (Fig. 3-9)

*When using the optional air outlet guides, the clearance is 19-11/16” (500 mm) or more.

6 Obstacles at rear, sides, and above only (Fig. 3-10)

• Do not install the optional air outlet guides for upward airflow.

3.5.3. When installing multiple outdoor units

Leave 1” (25 mm) space or more between the units. 1 Obstacles at rear only (Fig. 3-11)

2Obstacles at rear and above only (Fig. 3-12)

•No more than 3 units must be installed side by side. In addition, leave space as shown.

•Do not install the optional air outlet guides for upward airflow.

3Obstacles at front only (Fig. 3-13)

*When using the optional air outlet guides, the clearance is 39-3/8” (1000 mm) or more.

4 Obstacles at front and rear only (Fig. 3-14)

*When using the optional air outlet guides, the clearance is 39-3/8” (1000 mm) or more.

5 Single parallel unit arrangement (Fig. 3-15)

* When using the optional air outlet guides installed for upward airflow, the clearance is 39-3/8”

(1000 mm) or more.

6 Multiple parallel unit arrangement (Fig. 3-16)

* When using the optional air outlet guides installed for upward airflow, the clearance is 59-1/16”

(1500 mm) or more.

7Stacked unit arrangement (Fig. 3-17)

•The units can be stacked up to 2 units high.

•No more than 2 stacked units must be installed side by side. In addition, leave space as shown.

5

4. Installing the outdoor unit

Max. 1-3/16

(inch)	• Be sure to install the unit in a sturdy, level surface to prevent rattling noises dur-
	ing operation. (Fig. 4-1)
	<Foundation specifications>
A	Foundation bolt	M10 (3/8")
	Thickness of concrete	120 mm (4-23/32”)
D	Length of bolt	70 mm (2-3/4”)
	Weight-bearing capacity	320 kg (705 lbs)
	• Make sure that the length of the foundation bolt is within 30 mm (1-3/16”) of the
E	bottom surface of the base.
	• Secure the base of the unit firmly with four-M10 foundation bolts in sturdy loca-
C	tions.

Installing the outdoor unit

B

• Do not block the vent. If the vent is blocked, operation will be hindered and break-

down may result.

A

M10 (3/8") bolt

• In addition to the unit base, use the installation holes on the back of the unit to

B

Base

attach wires, etc., if necessary to install the unit. Use self-tapping screws (ø5 ×

C As long as possible

15 mm, ø13/16” × 19/32” or less) and install on site.

D

Vent

Warning:

E Set deep in the ground

Min. 18-11/16

• The unit must be securely installed on a structure that can sustain its

weight.

23-5/8

23-5/8

If the unit is mounted on an unstable structure, it may fall down and cause

damage or injuries.

13

14-9/16

• The unit must be installed according to the instructions in order to mini-

mize the risk of damage from earthquakes, typhoons, or strong winds. An

incorrectly installed unit may fall down and cause damage or injuries.

Min. 1

63/64

Caution:

8-7/8

8-7/8

• Install the unit on a rigid structure to prevent excessive operation sound or

41-11/32

vibration.

Fig. 4-1

5. Installing the refrigerant piping

A

Outdoor unit

B

Branch box

C

Indoor unit

D

The first joint

L

c1

D

b1

b2

h2

B

H

B

I

h1

a1

a5

a6

a7

a8

a2

a3

a4

C

C

C

C

C

h3

C

C

Fig. 5-1

5.1. Precautions for devices that use R410A refrigerant

•Refer to page 3 for precautions not included below on using air conditioners with

R410A refrigerant.

•Use ester oil, ether oil, alkylbenzene oil (small amount) as the refrigeration oil applied to the flared sections.

•Use C1220 copper phosphorus, for copper and copper alloy seamless pipes, to connect the refrigerant pipes. Use refrigerant pipes with the thicknesses specified in the table to the below. Make sure the insides of the pipes are clean and do not contain any harmful contaminants such as sulfuric compounds, oxidants, debris, or dust.

Warning:

When installing or relocating, or servicing the outdoor unit, use only the specified refrigerant (R410A) to charge the refrigerant lines. Do not mix it with any other refrigerant and do not allow air to remain in the lines.

If air is mixed with the refrigerant, then it can be the cause of abnormal high pressure in the refrigerant line, and may result in an explosion and other hazards. The use of any refrigerant other than that specified for the system will cause mechanical failure or system malfunction or unit breakdown. In the worst case, this could lead to a serious impediment to securing product safety.

ø6.35 mm (1/4 inch), ø9.52 mm (3/8 inch),	Thickness 0.8 mm (1/32 inch)
ø12.7 mm (1/2 inch)
ø15.88 (5/8 inch)	Thickness 1.0 mm (5/128 inch)

•Do not use pipes thinner than those specified above.

•The thicknesses listed in the table above are based on Japanese standards. Use pipes with a maximum working pressure of 4.15 MPa [601 PSIG] or higher according to local standards.

		Total piping length	c1 + b1 + b2 + a1 + a2 + a3 + a4 + a5 + a6 + a7 + a8 ≤ 150 m (492 ft.)
Permissible		Farthest piping length (L) *1	c1 + b2 + a8 ≤ 80 m (262 ft.)
		Piping length between outdoor unit and branch boxes	c1 + b1 + b2 ≤ 55 m (180 ft.)
length
		Farthest branch box from the first joint (b2)	b2	≤ 30 m (98 ft.)
(one-way)
		Farthest piping length after branch box (l)	a8	≤ 25 m (82 ft.)
		Total piping length between branch boxes and indoor units	a1	+ a2 + a3 + a4 + a5 + a6 + a7 + a8 ≤ 95 m (311 ft.)
		In indoor/outdoor section (H) *2	H ≤ 50 m (164 ft.) (In case of outdoor unit is set higher than indoor unit)
Permissible			H ≤ 40 m (131 ft.) (In case of outdoor unit is set lower than indoor unit)
height difference		In branch box/indoor unit section (h1)	h1	+ h2 ≤ 15 m (49 ft.)
(one-way)		In each branch unit (h2)	h2	≤ 15 m (49 ft.)
		In each indoor unit (h3)	h3	≤ 12 m (39 ft.)
Number of bends			| c1 + b1 + a1 |, | c1 + b1 + a2 |, | c1 + b1 + a3 |, | c1 + b1 + a4 |, | c1 + b1 + a5 |, | c1 + b2 +
			a6 |, | c1 + b2 + a7 |, | c1 + b2 + a8 | ≤ 15

*1 The piping specification table does not provide a minimum line set length. However, indoor units with connected piping length less than 16 ft. (5 m) could produce intermittent noise during normal system operation in very quiet environments. Please be aware of this important information when installing and locating the indoor unit within the conditioned space.

*2 Branch box should be placed within the level between the outdoor unit and indoor units.

6

5. Installing the refrigerant piping

5.2. Pipe length and height difference (Fig. 5-1)

Flared connections	• Remove the valve cover of the outdoor unit, then connect the pipe.
• This unit has flared connections on each indoor unit and branch box and outdoor	• Refrigerant pipes are used to connect the branch box and outdoor unit.
unit sides.

5.3.Additional refrigerant charge

Additional refrigerant charge

Refrigerant for the extended piping is not included in the outdoor unit when the unit is shipped from the factory. Therefore, charge each refrigerant piping system with additional refrigerant at the installation site. In addition, in order to carry out service, enter the size and length of each liquid pipe and additional refrigerant charge amounts in the spaces provided on the “Refrigerant amount” plate on the outdoor unit.

Calculation of additional refrigerant charge

•Calculate the additional charge using the liquid pipe size and length of the extended piping and total capacity of connected indoor units.

•Calculate the additional refrigerant charge using the procedure shown to the right, and charge with the additional refrigerant.

•For amounts less than 0.1 kg, round up the calculated additional refrigerant charge.

(For example, if the calculated charge is 6.01 kg, round up the charge to 6.1 kg.)

<Additional Charge> Calculation of refrigerant charge

Pipe size			Pipe size			Total capacity of		Amount for the
Liquid pipe			Liquid pipe			connected indoor units		indoor units
ø6.35		+	ø9.52		+		– 27	1.5 kg (53 oz)
(m) × 27.0 (g/m)			(m) × 70.0 (g/m)				28 – 54	2.5 kg (88 oz)
(0.29 (oz/ft))			(0.75 (oz/ft))
							55 – 78	3.0 kg (106 oz)
Included refrigerant amount when shipped from the factory
Included refrigerant amount
5.1 kg (10 lbs, 9 oz)
<Example>
Outdoor model	: MXZ-8C60NA				A : ø9.52		30 m (99 ft)
Indoor 1: model 24					a : ø9.52		15 m (49 ft)	At the conditions
2: model 15					b : ø6.35		10 m (33 ft)
								below:
3: model 09					c : ø6.35		10 m (33 ft)
4: model 09					d : ø6.35		20 m (66 ft)

The total length of each liquid line is as follows: ø9.52 : A + a = 30 + 15 = 45 m (148 ft)

ø6.35 : b + c + d = 10 + 10 + 20 = 40 m (131 ft)

The total capacity of connected indoor unit is as follows: 24 + 15 + 09 + 09 = 57

<Calculation example>

Additional refrigerant charge

40 ×	27.0	+ 45 ×	70.0		+ 3.0 = 7.3 kg (rounded up)
	1000		1000
(131 × 0.29 + 148 × 0.75 +				106 = 255 oz)

■In case of using 1-branch box

Flare connection employed. (No. brazing)

					Branch box
	A
		B	B		B	B	B
■ In case of using 2-branch boxes
	2 branches pipe (joint)
		: optional parts.
	A	A			Branch box #1
		A
	B	B			B	B	B
			Branch box #2
		Fig. 5-2
(1) Valve size for outdoor unit
For liquid			ø9.52 mm (3/8 inch)
For gas			ø15.88 mm (5/8 inch)
(2) Valve size for branch box
A UNIT	Liquid pipe		ø6.35 mm (1/4 inch)
	Gas pipe		ø9.52 mm (3/8 inch)
B UNIT	Liquid pipe		ø6.35 mm (1/4 inch)
	Gas pipe		ø9.52 mm (3/8 inch)
C UNIT	Liquid pipe		ø6.35 mm (1/4 inch)
	Gas pipe		ø9.52 mm (3/8 inch)
D UNIT	Liquid pipe		ø6.35 mm (1/4 inch)
	Gas pipe		ø9.52 mm (3/8 inch)
E UNIT	Liquid pipe		ø6.35 mm (1/4 inch)
	Gas pipe		ø12.7 mm (1/2 inch)
* 3-branch type : only A, B, C unit					Conversion formula
					1/4 F	ø6.35 (1/4)
					3/8 F	ø9.52 (3/8)
	A			B	1/2 F	ø12.7 (1/2)
					5/8 F	ø15.88 (5/8)
		Fig. 5-3
					3/4 F	ø19.05 (3/4)

5.4. Selecting pipe size (Fig. 5-2)

Conversion formula

		A		B
Liquid		ø9.52 mm	The piping connection size differs according to
		(3/8 inch)	the type and capacity of indoor units. Match the
			piping connection size of branch box with indoor
			unit.
		ø19.05 mm	If the piping connection size of branch box does
Gas			not match the piping connection size of indoor
		(3/4 inch)
			unit, use optional different-diameter (deformed)
			joints to the branch box side. (Connect deformed
			joint directly to the branch box side.)
Different-diameter joint (optional parts) (Fig. 5-3)
Model name		Connected pipes diameter		Diameter A	Diameter B
		mm (inch)		mm (inch)	mm (inch)
MAC-A454JP-E		ø9.52 (3/8) → ø12.7 (1/2)		ø9.52 (3/8)	ø12.7 (1/2)
MAC-A455JP-E		ø12.7 (1/2) → ø9.52 (3/8)		ø12.7 (1/2)	ø9.52 (3/8)
MAC-A456JP-E		ø12.7 (1/2) → ø15.88 (5/8)		ø12.7 (1/2)	ø15.88 (5/8)
PAC-493PI		ø6.35 (1/4) → ø9.52 (3/8)		ø6.35 (1/4)	ø9.52 (3/8)
PAC-SG76RJ-E		ø9.52 (3/8) → ø15.88 (5/8)		ø9.52 (3/8)	ø15.88 (5/8)
PAC-SG75RJ-E		ø15.88 (5/8) → ø19.05 (3/4)		ø15.88 (5/8)	ø19.05 (3/4)

Piping preparation

1 Table below shows the specifications of pipes commercially available.

Outside diameter	Insulation thickness	Insulation material
mm (inch)	mm (inch)
6.35 (1/4)	8 (5/16)
9.52 (3/8)	8 (5/16)	Heat resisting foam plastic 0.045
12.7 (1/2)	8 (5/16)
		specific gravity
15.88 (5/8)	8 (5/16)
19.05 (3/4)	8 (5/16)

2 Ensure that the 2 refrigerant pipes are insulated to prevent condensation. 3 Refrigerant pipe bending radius must be 4” (100 mm) or more.

Caution:

Be sure to use the insulation of specified thickness. Excessive thickness may cause incorrect installation of the indoor unit and branch box, and lack of thickness may cause dew drippage.

2-branch pipe (Joint): Optional parts (According to the connection method, you can choose the favorite one.

Model name	Connection method
MSDD-50AR-E	flare
MSDD-50BR-E	brazing

■■Installation procedure (2 branches pipe (Joint))

Refer to the installation manuals of MSDD-50AR-E and MSDD-50BR-E.

7

5. Installing the refrigerant piping

DC

A Liquid pipe

B B Gas pipe

C Insulation

D Taping

A

Fig. 5-4

45°± 2°

0.5°± øA 90° R1/64”

to R1/32”

A Flare cutting dimensions

B Flare nut tightening torque

Fig. 5-5

A (Fig. 5-5)

Copper pipe O.D.

Flare dimensions

(mm) (inch)

øA dimensions (mm) (inch)

ø6.35 (1/4)

8.7 - 9.1 (5/16 - 3/8)

ø9.52 (3/8)

12.8 - 13.2 (1/2 - 33/64)

ø12.7 (1/2)

16.2 - 16.6 (41/64 - 21/32)

ø15.88 (5/8)

19.3 - 19.7 (49/64 - 25/32)

ø19.05 (3/4)

23.6 - 24.0 (15/16 - 61/64)

Copper pipe O.D.

Flare nut O.D.

Tightening torque

(mm) (inch)

(mm) (inch)

(N·m)* (ft·lbs)

ø6.35 (1/4)

17 (43/64)

14

- 18 (10 - 13)

ø6.35 (1/4)

22 (7/8)

34

- 42 (25 - 30)

ø9.52 (3/8)

22 (7/8)

34

- 42 (25 - 30)

ø9.52 (3/8)

26 (1-3/64)

49

- 61 (35 - 44)

ø12.7 (1/2)

26 (1-3/64)

49

- 61 (35 - 44)

ø12.7 (1/2)

29 (1-9/64)

68

- 82 (49 - 59)

ø15.88 (5/8)

29 (1-9/64)

68

- 82 (49 - 59)

ø15.88 (5/8)

36 (1-27/64)

100

- 120 (71 - 87)

ø19.05 (3/4)

36 (1-27/64)

100

- 120 (71 - 87)

* 1 N·m 10 kgf·cm

A

A Die

B Copper pipe

Fig. 5-6

Warning:

When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes. The compressor may burst and cause injury if any foreign substance, such as air, enters the system.

5.5. Connecting pipes (Fig. 5-4) (Fig. 5-5)

•Conduct sufficient anti-condensation and insulation work to prevent water dripping from the refrigerant piping. (liquid pipe/gas pipe)

•Increase insulation depending on the environment where the refrigerant piping is installed, or condensation may occur on the surface of the insulation material. (Insulation material Heat-resistant temperature: 120 °C, 248 °F, Thickness: 15 mm, 5/8 inch or more)

*When the refrigerant piping is used in locations subject to high temperature and humidity such as in the attic, further addition of insulation may be required.

•To insulate the refrigerant piping, apply heat-resistant polyethylene foam between the indoor unit and insulation material as well as to the net between the insulation material filling all gaps.

(Condensation forming on the piping may result in condensation in the room or burns when contacting the piping.)

•The indoor parts of the drain pipe should be wrapped with polyethylene foam insulation materials (specific gravity of 0.03, thickness of 9 mm (3/8 inch) or more).

[Fig. 5-5]

•Apply thin layer of refrigerant oil to pipe and joint seating surface before tightening flare nut. A

•Use 2 wrenches to tighten piping connections. B

•Use leak detector or soapy water to check for gas leaks after connections are completed.

•Apply refrigerating machine oil over the entire flare seat surface. C

•Use the flare nuts as follows. D

Warning:

When installing the unit, securely connect the refrigerant pipes before starting the compressor.

■■Pipe size (Outdoor unit-Branch box)

Pipe size	Liquid	ø9.52 (3/8)		The lineup of a connectable indoor unit
(ømm) (inch)	Gas	ø19.05 (3/4)		depends on a district/areas/country.

■■Pipe size (Branch box-Indoor unit) *Case of M series or S series Indoor unit

Indoor unit type

(BTU/h)

06

09

12

15

18

24

Liquid

ø6.35

ø6.35

ø6.35

ø6.35

ø6.35

ø9.52

Pipe size

(1/4)

(1/4)

(1/4)

(1/4)

(1/4)

(3/8)

(ømm) (inch)

Gas

ø9.52

ø9.52

ø9.52

ø12.7

ø12.7

ø15.88

(3/8)

(3/8)

(3/8)

(1/2)

(1/2)

(5/8)

■■Pipe size (Branch box-Indoor unit) *Case of P series indoor unit

Indoor unit type

(BTU/h)

12

18

24

30

36

Liquid

ø6.35

ø6.35

ø9.52

ø9.52

ø9.52

Pipe size

(1/4)

(1/4)

(3/8)

(3/8)

(3/8)

(ømm) (inch)

Gas

ø12.7

ø12.7

ø15.88

ø15.88

ø15.88

(1/2)

(1/2)

(5/8)

(5/8)

(5/8)

•When bending the pipes, be careful not to break them. Bend radius of 100 mm (4 inch) to 150 mm (6 inch) are sufficient.

•Make sure the pipes do not contact the compressor. Abnormal noise or vibration

may result.

1Pipes must be connected starting from the indoor unit. Flare nuts must be tightened with a torque wrench.

2Flare the liquid pipes and gas pipes and apply a thin layer of refrigeration oil (Applied on site).

•When usual pipe sealing is used, refer to Table 2 for flaring of R410A refrigerant pipes.

The size adjustment gauge can be used to confirm A measurements.

Caution:

•Be sure to wrap insulation around the piping. Direct contact with the bare piping may result in burns or frostbite.

Table 2 (Fig. 5-6)		mm (inch)
		A
Copper pipe O.D.	Flare tool for R410A	Flare tool for R22·R407C
	Clutch type
ø6.35 (1/4)	0 - 0.5 (0 - 1/64)	1.0 - 1.5 (3/64 - 1/16)
ø9.52 (3/8)	0 - 0.5 (0 - 1/64)	1.0 - 1.5 (3/64 - 1/16)
ø12.7 (1/2)	0 - 0.5 (0 - 1/64)	1.0 - 1.5 (3/64 - 1/16)
ø15.88 (5/8)	0 - 0.5 (0 - 1/64)	1.0 - 1.5 (3/64 - 1/16)
ø19.05 (3/4)	0 - 0.5 (0 - 1/64)	1.0 - 1.5 (3/64 - 1/16)

8

5. Installing the refrigerant piping

D	C
	B
	A E

A Front piping cover

B Piping cover

C Stop valve

D Service panel

E Bend radius : 100 mm - 150 mm (3-15/16″ – 5-7/8″)

Fig. 5-7

(1)

		Fig. 5-8
(2)	B C	I
		E
	J
	H
		Fig. 5-9
A Valve		F Completely closed
B Unit side		G Completely open
C Service port		H Refrigerant piping side (On-site installation)
D Handle		I Direction the refrigerant flows in
E Cap		J Wrench hole

5.6. Refrigerant piping (Fig. 5-7)

Remove the service panel D (3 screws) and the front piping cover A (2 screws) and rear piping cover B (4 screws).

1Perform refrigerant piping connections for the indoor/outdoor unit when the outdoor unit’s stop valve is completely closed.

2 Vacuum-purge air from the indoor unit and the connection piping.

Evacuation

Evacuate with the valve of the outdoor unit closed and evacuate both the connection piping and the indoor unit from the service port provided on the valve of the outdoor unit using a vacuum pump. (Always evacuate from the service port of both liquid pipe and gas pipe.) After the vacuum reaches 650 Pa [abs] [0.0943 psi/5 Torr], continue evacuation for at least one hour or more. Then, stop the vacuum pump and leave it for 1 hour. Ensure the degree of vacuum has not increased. (If the degree of vacuum increase is larger than 130 Pa [0.01886 PSIG/1.0 Torr], water might have entered. Apply pressure to dry nitrogen gas up to 0.05 MPa [7.25 PSIG] and vacuum again.) Finally, seal in with the liquid refrigerant through the liquid pipe, and adjust the gas piping to obtain an appropriate amount of the refrigerant during operation.

*Never perform air purging using refrigerant.

3After connecting the refrigerant pipes, check the connected pipes and the indoor unit for gas leaks. (Refer to 5.8. Refrigerant pipe airtight testing method)

4Vacuumize the refrigerant lines through the service port of the liquid and gas stop valves. And then open the stop valves completely (for both the liquid and gas stop valves). This will completely connect the refrigerant lines of the indoor and outdoor units.

•If the stop valves are left closed and the unit is operated, the compressor and control valves will be damaged.

•Use a leak detector or soapy water to check for gas leaks at the pipe connection sections of the outdoor unit.

•Do not use the refrigerant from the unit to purge air from the refrigerant lines.

•After the valve work is completed, tighten the valve caps to the correct torque: 20 to 25 N·m [14 to 18 ft·lbs] (200 to 250 kgf·cm).

Failure to replace and tighten the caps may result in refrigerant leakage. In addition, do not damage the insides of the valve caps as they act as a seal to prevent refrigerant leakage.

5Use sealant to seal the ends of the thermal insulation around the pipe connection sections to prevent water from entering the thermal insulation.

Refrigerant pipes are protectively wrapped

•The pipes can be protectively wrapped up to a diameter of ø90 mm (3-9/16”) before or after connecting the pipes. Cut out the knockout in the pipe cover following the groove and wrap the pipes.

Pipe inlet gap

•Use putty or sealant to seal the pipe inlet around the pipes so that no gaps remain.

(If the gaps are not closed, noise may be emitted or water and dust will enter the

unit and breakdown may result.)

Note:

<Triple Evacuation>

•Evacuate the system to 4,000 microns from both service valves. System manifold gauges must not be used to measure vacuum. A micron gauge must be used at all times.

-Break the vacuum with Nitrogen (N2) into the discharge service valve to 0 PSIG.

•Evacuate the system to 1,500 microns from the suction service valve.

-Break the vacuum with Nitrogen (N2) into the discharge service valve to 0 PSIG.

•Evacuate the system to 500 microns. System must hold the vacuum at 500 microns for a minimum of 1 hour.

•Conduct a rise test for a minimum of 30 minutes.

5.7. Caution for piping connection/valve operation

•Conduct piping connection and valve operation accurately by following the figure below.

•Apply sealer along the insulator to prevent water entering the insulator covering the refrigerant pipe joints.

•After evacuation and refrigerant charge, ensure that the handle is fully open. If operating with the valve closed, abnormal pressure will be imparted to the highor low-pressure side of the refrigerant circuit, giving damage to the compressor, etc.

•Determine the amount of additional refrigerant charge (refer “5.3. Addition of refrig- erant”), and charge refrigerant additionally through the service port after completing piping connection work.

•After completing work, tighten the service port (12 - 15 N·m) [9 - 11 ft·lbs] and cap (20 - 25 N·m) [14 - 18 ft·lbs] securely to prevent gas leak.

*1 N·m 10 kgf·cm

Method of completely opening the stop valve

The stop valve opening method varies according to the outdoor unit model. Use the appropriate method to open the stop valves.

(1) Gas side (Fig. 5-8)

1Remove the cap, pull the handle toward you and rotate 1/4 turn in a counterclockwise direction to open.

2Make sure that the stop valve is open completely, push in the handle and rotate the cap back to its original position.

(2) Liquid side (Fig. 5-9)

1Remove the cap and turn the valve rod counterclockwise as far as it will go with the use of a 4 mm [3/16”] hexagonal wrench. Stop turning when it hits the stopper.

2Make sure that the stop valve is open completely and rotate the cap back to its original position.

9

5. Installing the refrigerant piping

			E	F
				G
	A	LO B	HI
		C	D	K

Fig. 5-10

		5.8. Refrigerant pipe airtight testing method.
		Airtight test (Fig. 5-10)
	H	Airtight test should be made by pressurizing nitrogen gas. For the test method, refer
		to the following figure.
	I	(1) Connecting the testing tool. Make a test with the stop valve closed. Be also sure
		to pressurize both liquid or high-pressure pipe and gas or low pressure pipe.
		(2) Do not add pressure to the specified pressure all at once; add pressure little by
		little.

1Pressurize to 0.5 MPa [73 PSIG], wait 5 minutes, and make sure the pressure does not decrease.

2Pressurize to 1.5 MPa [218 PSIG], wait 5 minutes, and make sure the pressure does not decrease.

3Pressurize to 4.15 MPa [601 PSIG] and measure the surrounding temperature and refrigerant pressure.

(3)If the specified pressure holds for about one day and does not decrease, the pipes have passed the test and there are no leaks.

• If the surrounding temperature changes by 1°C [1.8°F], the pressure will change by about 0.01 MPa [1.5 PSIG]. Make the necessary corrections.

(4)If the pressure decreases in steps (2) or (3), there is a gas leak. Look for the source of the gas leak.

A Nitrogen gas	F Outdoor unit
B System analyzer	G Stop valve
C Lo-knob	H Liquid pipe or high-pressure pipe
D Hi-knob	I Gas pipe or low-pressure pipe
E To branch box	K Service port

*The figure to the left is an example only. The stop valve shape, service port position, etc., may vary according to the model.

*Turn section A only.

(Do not further tighten sections A and B together.)

C Charge hose

D Service port

Precautions when using the charge valve (Fig. 5-11)

Do not tighten the service port too much when installing it, otherwise, the valve core could be deformed and become loose, causing a gas leak.

After positioning section B in the desired direction, turn section A only and tighten it. Do not further tighten sections A and B together after tightening section A.

Warning:

•When installing the unit, securely connect the refrigerant pipes before starting the compressor.

Fig. 5-11

6. Drainage piping work

Outdoor unit drainage pipe connection

When drain piping is necessary, use the drain socket or the drain pan (option).

Drain socket	PAC-SG61DS-E
Drain pan	PAC-SH97DP-E

7. Electrical work

7.1.Caution

1 Follow ordinance of your governmental organization for technical standard related to electrical equipment, wiring regulations and guidance of each electric power company.

2Wiring for control (hereinafter referred to as transmission line) shall be (5 cm

[2 inch] or more) apart from power source wiring so that it is not influenced by

electric noise from power source wiring. (Do not insert transmission line and power source wire in the same conduit.)

3 Be sure to provide designated grounding work to outdoor unit.

4 Give some allowance to wiring for electrical part box of indoor and outdoor units, because the box is sometimes removed at the time of service work.

5Never connect the main power source to terminal block of transmission line. If connected, electrical parts will be burnt out.

6Use 2-core shield cable for transmission line. If transmission lines of different systems are wired with the same multiplecore cable, the resultant poor transmitting and receiving will cause erroneous operations.

7Only the transmission line specified should be connected to the terminal block for outdoor unit transmission.

(Transmission line to be connected with indoor unit : Terminal block TB3 for transmission line, Other : Terminal block TB7 for centralized control)

Erroneous connection does not allow the system to operate.

8In case to connect with the upper class controller or to conduct group operation in different refrigerant systems, the control line for transmission is required between the outdoor units each other.

Connect this control line between the terminal blocks for centralized control. (2-wire line with no polarity)

When conducting group operation in different refrigerant systems without con-

necting to the upper class controller, replace the insertion of the short circuit connector from CN41 of one outdoor unit to CN40.

9Before turning outdoor unit on, be sure to turn the indoor units and the branch boxes.

10

7. Electrical work

					E
L1 L2	GR	B1 B2	M1 M2 S M1	M2 S	F
TB1	B	TB1B	TB3	TB7
A		C	D
			CONDUIT PLATE:
			accessory		ø37 knock-out hole
					(For power supply wires)
		ø24 knock-out hole
		(For transmission wires)
A :Power source			E :Screw on the electrical component box
B :Power supply for branch box			F :Screw on the electrical component box

C :Screw on the electrical component box

D :Transmission line

Fig. 7-1

7.2.Control box and connecting position of wiring (Fig. 7-1)

1.Connect the branch box transmission line to transmission terminal block (TB3), or connect the wiring between outdoor units or the wiring with the centralized control system to the centralized control terminal block (TB7).

When using shielded wiring, connect shield ground of the branch box transmission line to the screw (E or F) and connect shield ground of the line between outdoor units and the central control system transmission line to the shield (S) terminal of the centralized control terminal block (TB7) shield (S) terminal. In addition, in the case of outdoor units whose power supply connector CN41 has been replaced by CN40, the shield terminal (S) of terminal block (TB7) of the centralized control system should also be connected to the screw (E or F) using attached lead wire.

2.Conduit mounting plates (ø27) are being provided. Pass the power supply and transmission wires through the appropriate knock-out holes, then remove the knock-out piece from the bottom of the terminal box and connect the wires.

3.Fix power source wiring to terminal box by using buffer bushing for tensile force (PG connection or the like).

4.The terminal bed (TB1B) is for supplying power to the branch box (220 ~ 240 V. max 6A).

Caution:

Never connect the transmission line for the branch box or the central control system transmission line to this terminal bed (TB1B). If the transmission lines are connected, the indoor unit terminal block, branch box terminal block or centralized control terminal block could be damaged.

7.3.Wiring transmission cables

1 Types of control cables

1. Wiring transmission cables

•Types of transmission cables: Shielding wire CVVS or CPEVS or MVVS

•Cable diameter: More than 1.25 mm² [AWG 16]

•Maximum wiring length: Within 200 m [656 ft]

2. M-NET Remote control cables

Kind of remote control cable

Shielding wire (2-core) CVVS, CPEVS or MVVS.

Cable diameter

0.5 to 1.25 mm2 [AWG 20 to AWG 16]*

Remarks

When 10 m [32 ft] is exceeded, use cable with

the same specifications as transmission line

wiring.

* Connected with simple remote controller.

2 Wiring examples

[1] Basic systems

OC:

Outdoor unit

BC:

Branch box

OC

A-IC:

A-Control indoor unit (M, P, S series indoor unit)

MA-RC: MA remote controller

WL-RC: Wireless remote controller

BC (5-branch type)

BC (3-branch type)

A

B

C

D

E

A

B

C

A-IC A-IC

A-IC

A-IC

A-IC

A-IC

A-IC

A-IC

MA-RC

MA-RC

WL-RC

WL-RC

WL-RC

WL-RC

WL-RC

WL-RC

[2] Standard systems

3. MA Remote control cables

	Kind of remote control cable	Sheathed 2-core cable (unshielded) CVV
	Cable diameter	0.3 to 1.25 mm² [AWG 22 to AWG 16] (0.75 to
		1.25 mm² [AWG 18 to AWG 16])*
	Remarks	Within 200 m [656 ft]

* Connected with simple remote controller.

				Note:
				The indoor units can be connected
	OC			to any of the 5 connectors (5-branch
				type) or 3 connectors (3-branch type)
				of the branch box.
	BC(5-branch type)					BC (3-branch type)
A	B	C	D	E		A	B		C
A-IC A-IC				A-IC			A-IC		A-IC
MA-RC	MA-RC
				WL-RC			WL-RC		WL-RC

2-1. Only 3-branch type

2-2. Only 5-branch type

OC

OC

BC (3-branch type)

BC (5-branch type)

A

B

C

A

B

C

D

E

A-IC A-IC

A-IC

A-IC A-IC

A-IC

A-IC

A-IC

WL-RC

WL-RC

WL-RC

WL-RC

WL-RC

WL-RC

WL-RC

WL-RC

2-3. 2-branch boxes (3-branch type)

OC

BC (3-branch type)			BC(3-branch type)
A	B	C	A	B	C

A-IC A-IC A-IC A-IC A-IC A-IC

WL-RC		WL-RC		WL-RC		WL-RC		WL-RC		WL-RC

11

7. Electrical work

2-4. 2 branch boxes (5-branch type, maximum 8 indoor units)

OC:

Outdoor unit

BC:

Branch box

OC

A-IC:

A-Control indoor unit (M, P, S series indoor unit)

M-IC:

M-NET Control indoor unit (City Multi indoor unit)

MA-RC: MA remote controller

ME-RC: ME remote controller

BC (5-branch type)

BC (5-branch type)

WL-RC: Wireless remote controller

A

B

C

D

E

A

B

C

D

E

A-IC

A-IC

A-IC

A-IC

A-IC

A-IC

A-IC

A-IC

A-IC

A-IC

1. Up to 2 branch boxes can be connected to a single outdoor unit.

2. Up to 8 indoor units can be connected to the system.

WL-RC

WL-RC

WL-RC

WL-RC

WL-RC

WL-RC

WL-RC

WL-RC

WL-RC

WL-RC

NO

[3]Incorrect systems

3-1. Group operation by single remote controller

OC

BC(3-branch type)

A B C

A-IC A-IC A-IC

MA-RC

WL-RC

NO

3-2. Group operation between different

3-3. Connection of indoor units of CITY

refrigerant systems

MULTI series.

OC

OC

OC

BC (3-branch type)

BC (3-branch type)

A

BC (5-branch type)

A

B

C

A

B

C

B

C

D

E

* CITY

A-IC

A-IC

A-IC

A-IC

A-IC

A-IC

A-IC

A-IC

M-IC

MULTI

MA-RC

WL-RC

WL-RC

WL-RC

WL-RC

WL-RC

WL-RC

WL-RC

NO

NO

3-4.Connection of M-NET Remote controller

OC

A

BC (5-branch type)

B

C

D

E

A-IC

A-IC

A-IC

A-IC

A-IC

ME-RC

WL-RC

WL-RC

WL-RC

WL-RC

WL-RC

NO

3-1. Plural indoor units cannot be operated by a single remote controller. 3-2. Different refrigerant systems cannot be connected together.

3-3. Indoor units of CITY MULTI series cannot be connected to the branch boxes or outdoor unit.

3-4.M-NET Remote controller cannot be connected to this system.

12

7. Electrical work

7.4. Branch box/outdoor wire connection and outdoor power supply cord connection (Fig. 7-2)

Warning:

•Be sure to attach the terminal block covers/panel of the outdoor unit securely. If it is not attached correctly, it could result in a fire or an electric shock due to dust, water, etc.

•Be sure to connect the power supply cords and the connecting wires for the indoor units, outdoor units, and branch boxes directly to the units (no intermediate connections).

Intermediate connections can lead to communication errors if water enters the cords or wires and causes insufficient insulation to ground or a poor electrical contact at the intermediate connection point.

(If an intermediate connection is necessary, be sure to take measures to prevent water from entering the cords and wires.)

Caution:

•Be careful not to make mis-wiring.

•Firmly tighten the terminal screws to prevent them from loosening.

•After tightening, pull the wires lightly to confirm that they not move.

•If the connecting wire is incorrectly connected to the terminal block, the unit does not operate normally.

Loosen terminal screw.

Terminal

block Lead wire Connection details

•Connect wire from the branch box correctly to the terminal block.

•For future servicing, give extra length to connecting wire.

					Branch Box	TB3A	TB	TB5/TB15
	OC					S1	S1	A-IC	1	A	MA-RC
	(51)					S2	S2	(01)	2	B
						S3	S3
	TB3	TB7	L1	TB5		TB3B	TB	TB5/TB15
	M1 M2 S	M1 M2 S		M1		S1	S1	A-IC	1	A	MA-RC
				M2		S2	S2	(02)	2	B
				S		S3	S3
L3						TB3C	TB	TB5/TB15
						S1	S1	A-IC	1	A	MA-RC
						S2	S2	(03)	2	B
					(01)	S3	S3
						TB3D	TB
			L2			S1	S1	A-IC			WL-RC
						S2	S2	(04)
						S3	S3
						TB3E	TB
	OC					S1	S1	A-IC			WL-RC
	(53)					S2	S2	(05)
						S3	S3
L4	TB3	TB7
		M1 M2 S	A		Branch Box	TB3A	TB	TB5/TB15
	M1 M2 S
						S1	S1	A-IC	1	A	MA-RC
						S2	S2	(06)	2	B
						S3	S3
A	Power Supply
	Unit			TB5		TB3B	TB
					(06)
	M1 M2 S			M1		S1	S1	A-IC			WL-RC
				M2		S2	S2	(07)
			DC24V	S		S3	S3
L5	System
						TB3C	TB
	controller					S1	S1	A-IC			WL-RC
	M1 M2 S					S2	S2	(08)
						S3	S3

A : Shielded wire

( ) : Address example

Fig. 7-2

IMPORTANT

Make sure that the current leakage breaker is one compatible with higher harmonics.

Always use a current leakage breaker that is compatible with higher harmonics as this unit is equipped with an inverter.

The use of an inadequate breaker can cause the incorrect operation of inverter.

Longest length via outdoor units:

L1 + L2 + L3 + L4 + L5 500 m (1640 ft.) (1.25 mm2 [AWG 16] or more)

Longest transmission cable length

L1 + L2, L3 + L4, L5 200 m (656 ft.) (1.25 mm2 [AWG 16] or more)

7.5.Wiring of main power supply and equipment capacity

Schematic Drawing of Wiring (Example) (Fig. 7-3)

<When Power Is Supplied from the Outdoor Unit>

BC

A			S1/S2/S3	D
208/230 VAC, 60 Hz	L1/L2
		B1/B2	L1/L2
	GR		S1/S2/S3	D
			S1/S2/S3	D
			C
			S1/S2/S3	D	A Switch (Breakers for Wiring and Current Leakage)
					B Outdoor Unit
			L1/L2
			S1/S2/S3	D	C Branch Box
			S1/S2/S3		D A-Control indoor unit (M, P, S, series indoor unit)
					E Pull Box
<When Power Is Supplied Separately>
	B						E
A				A
208/230 VAC, 60 Hz	L1/L2		208/230 VAC, 60 Hz
	GR				C		C
					S1/S2/S3	D	S1/S2/S3	D
					L1/L2		L1/L2
					S1/S2/S3	D	S1/S2/S3	D
					S1/S2/S3	D	S1/S2/S3

Fig. 7-3

13

7. Electrical work

Thickness of Wire for Main Power Supply and On/Off Capacities

Minimum Wire Thickness

Breaker for

Breaker for Current

Minimum cir-

Maximum rating of

Power Supply

(mm2 [AWG])

over current protec-

Model

Wiring*1

Leakage

cuit ampacity

Main Cable*2

Ground

tor device

Outdoor Unit

8C60NA

208/230 VAC, 60Hz

13.3 [AWG6]

13.3 [AWG6]

50 A

50 A 30 mA 0.1 sec.

46 A

52 A

or less

Indoor Unit

208/230 VAC, 60Hz

Refer to installation manual of indoor unit.

*1. Be sure to ground the unit correctly. If required, take measures against leakage.

*2. Use copper supply wires. Use the electric wires over the rating voltage 300 V.

Total operating current of the indoor unit

Minimum wire thickness (mm2/AWG)

Ground-fault interruper *1

Local switch (A)

Breaker for wiring

Main Cable

Branch

Ground

Capacity

Fuse

(NFB)

F0 = 15A or less *2

2.1/14

2.1/14

2.1/14

15 A current sensitivity *3

15

15

15

F0 = 20A or less *2

3.3/12

3.3/12

3.3/12

20 A current sensitivity *3

20

20

20

F0 = 30A or less *2

5.5/10

5.5/10

5.3/10

30 A current sensitivity *3

30

30

30

Apply to IEC61000-3-3 about max. permissive system impedance. *1 The Ground-fault interrupter should support inverter circuit.

The Ground-fault interrupter should combine using of local switch or wiring breaker. *2 Please take the larger of F1 or F2 as the value for F0.

F1 = Total operating maximum current of the indoor units × 1.2

F2 = {V1 × (Quantity of Type 1)/C} + {V1 × (Quantity of Type 2)/C} + · · · + {V1 × (Quantity of Type 8)/C}

Indoor unit			V1	V2
Type 1		PEAD-A·AA, MVZ-A·AA	26.9
Type 2	PLA-A·BA, PLA-A·EA7, SEZ-KD·NA		19.8
Type 3		MFZ-KA·NA	16.2
Type 4		MSZ-FE·NA	9.9	2.4
Type 5		MFZ-KJ·NA, MSZ-GL·NA	7.4
Type 6	MSZ-FH·NA, MSZ-FH·NA2, MSZ-EF·NAW(B)(S)-U1, MSZ-GE·NA		6.8
Type 7		SLZ-KA·NA	3.5
Type 8	Branch box (PAC-MK·BC(B))		5.1	3.0

C : Multiple of tripping current at tripping time 0.01 s

Please pick up "C" from the tripping characteristic of the breaker.

<Example of "F2" calculation>

* Condition Branch Box × 2 + SEZ-KD∙NA × 5, C = 8 (refer to right sample chart)

F2 = 5.1 × 2/8 + 19.8 × 5/8 = 13.65

*3 Current sensitivity is calculated using the following formula.

G1 = V2 × Quantity of Type 1 + V2 × Quantity of Type 2 + · · · + V2 × Quantity of Type 8 + V3 (Wire length [kW])

G1			Current sensitivity
30 or less		30 mA 0.1 sec or less
100 or less		100 mA 0.1 sec or less
Wire thickness			V3
1.5 mm2			48
2.5 mm2			56
4.0 mm2			66

Sample chart

6000
	600
								SAMPLE
[s]	60
Time
	10
Tripping
	1
	0.1
0.01
								8 10	20
	1	2	3		4	6

C

Rated Tripping current (x)

1.Use a separate power supply for the outdoor unit and indoor unit.

2.Bear in mind ambient conditions (ambient temperature,direct sunlight, rain water,etc.) when proceeding with the wiring and connections.

3.The wire size is the minimum value for metal conduit wiring. The power cord size should be 1 rank thicker consideration of voltage drops.

Make sure the power-supply voltage does not drop more than 10%.

4.Specific wiring requirements should adhere to the wiring regulations of the region.

5.Power supply cords of parts of appliances for outdoor use shall not be lighter than polychloroprene sheathed flexible cord (design 60245 IEC57). For example, use wiring such as YZW.

6.Install an earth longer than other cables.

Warning:

•Pleaseturnoffthemainpowersupplywhenservicing.AnddonottouchtheB1,B2 terminalswhenthepowerisenergized.Ifisolatorshouldbeusedbetweenoutdoor unitandbranchbox/indoorunitandbranchbox,pleaseuse3-poletypeor2-poletype. (Please refer to figure below.)

•Turn on the main power when the ambient temperature is -20°C (-4°F) or higher.

•Under conditions of -20°C (-4°F), it needs at least 4hr stand by before the units operate in order to warm the electrical parts.

					2 poles isolator (Switch)
							Branch box
B1						L1
Outdoor unit B2						L2
						GR

Caution:

After using the isolator, be sure to turn off and on the main power supply to reset the system. Otherwise, the outdoor unit may not be able to detect the branch box(es) or indoor units.

Be sure to connect the outdoor-branch box/indoor-branch box connecting cables directly to the units (no intermediate connections).

Intermediate connections can lead to communication errors if water enters the cables and causes insufficient insulation to ground or a poor electrical contact at the intermediate connection point.

(If an intermediate connection is necessary, be sure to take measures to prevent water from entering the cables.)

Never splice the power cable or the indoor-outdoor-branch box connection cable, otherwise it may result in a smoke, a fire or communication failure.

14

7. Electrical work

7.6. Address setting

Switch address setting

Unit

Outdoor

Branch Box

Indoor

Address

Address

Connection Setting

Port

A

B

C

D

E

–

ON

ON: Indoor connect

Switch

OFF

1

2

3

4

5

6

OFF:No connection

None

*

SWU2 SWU1

SW12 SW11

SW1

*SW1-6 not use

range

51 - 100

1 - 50

–

–

•

According to the set address (for example, 01), the ad-

•

Specify whether indoor units are connected to each

dresses for the connected indoor units are set sequentially

port (A, B, C, D, and E).

(for example, 02, 03, 04, and 05).

setting

SW1

1

2

3

4

5

SW1

1

2

3

4

5

(6)

There are no ad-

Branch address + 50

ON

ON

ON

ON

ON

Port

A

B

C

D

E

(not use)

dress settings for

the indoor units.

Port

A

B

C

D

E

Indoor units are connected ON

Address

01

(SW11, 12)

Indoor units are not connected OFF

02

03

04

05

(sequential numbers)

Note: 1. Branch box address

When setting the address, use a number within the range 1–50.

Ex. The set address is (47) and there are 5 indoor units (A, B, C, D, and E).

If A: (47), B: (48), C: (49), D: (50), and E: (51), E is incorrect because it exceeds 50.

Ex1. Outdoor + Branch <1> (Indoor A, B, C, D, E) + Branch <2> (Indoor A, B, C)

								*1 Outdoor address
				Branch-Box <1>
								Branch Box <1> start address + 50 = 01 + 50 = 51
				address (01) *2
								*2 Branch Box <1>
				SW1 1, 2, 3, 4, 5 ON
								A-port address = Start address = 01
	Outdoor
				(01) = A-port			Indoor	B-port address = Start address + 1 = 02
	address
	(51) *1			(02) = B-port			Indoor	C-port address = Start address + 2 = 03
				(03) = C-port				D-port address = Start address + 3 = 04
							Indoor
				(04) = D-port			Indoor	E-port address = Start address + 4 = 05
				(05) = E-port
							Indoor	*3 Branch-Box <2>
				Branch-Box <2>
								Branch Box <2> start address
				address (06) *3
								= Branch Box <1> oldest start address + 1
				SW1 1, 2, 3	ON
								= 05 + 1 = 06
				SW1 4, 5	OFF
								A-port address = Start address = 06
				(06) = A-port				B-port address = Start address + 1 = 07
							Indoor	C-port address = Start address + 2 = 08
				(07) = B-port			Indoor
				(08) = C-port			Indoor

Ex2. Outdoor + Branch <1> (Indoor A, C, E) + Branch <2> (Indoor A, C, E)

								*1 Outdoor address
				Branch-Box <1>
								Branch Box <1> start address + 50 = 01 + 50 = 51
				address (01) *2
								*2 Branch-Box <1>
				SW1 1, 3, 5	ON
	Outdoor							A-port address = Start address = 01
				SW1 2, 4	OFF
								B-port address	no connection
	address
								C-port address = Start address + 1 = 02
	(51) *1			(01) = A-port			Indoor	D-port address	no connection
				non	B-port
								E-port address = Start address + 2 = 03
				(02) = C-port			Indoor
				non	D-port
				(03) = E-port			Indoor	*3 Branch-Box <2>
				Branch-Box <2>
								Branch Box <2> start address
				address (04) *3
								= Branch Box <1> oldest start address + 1
				SW1 1, 3, 5	ON
								= 03 + 1 = 04
				SW1 2, 4	OFF
								A-port address = Start address = 04
				(04) = A-port				B-port address	no connection
							Indoor
								C-port address = Start address + 1 = 05
				non	B-port
								D-port address	no connection
				(05) = C-port			Indoor
								E-port address = Start address + 2 = 06
				non	D-port
				(06) = E-port			Indoor

15

8. Test run

8.1. Before test run

►After completing installation and the wiring and piping of the indoor and outdoor units, check for refrigerant leakage, looseness in the power supply or control wiring, wrong polarity, and no disconnection of one phase in the supply.

►Use a 500-volt M-ohm tester to check that the resistance between the power supply terminals and ground is at least 1 MΩ.

►Do not carry out this test on the control wiring (low voltage circuit) termi-

nals.

Warning:

Do not use the air conditioner if the insulation resistance is less than 1 MΩ.

Insulation resistance

After installation or after the power source to the unit has been cut for an extended period, the insulation resistance will drop below 1 MΩ due to refrigerant accumulating in the compressor. This is not a malfunction. Perform the following procedures.

1.Remove the wires from the compressor and measure the insulation resistance of the compressor.

2.If the insulation resistance is below 1 MΩ, the compressor is faulty or the resistance dropped due the accumulation of refrigerant in the compressor.

3.After connecting the wires to the compressor, the compressor will start to warm up after power is supplied. After supplying power for the times indicated below, measure the insulation resistance again.

•The insulation resistance drops due to accumulation of refrigerant in the compressor. The resistance will rise above 1 MΩ after the compressor is warmed up for four hours.

(The time necessary to warm up the compressor varies according to atmospheric conditions and refrigerant accumulation.)

•To operate the compressor with refrigerant accumulated in the compressor, the compressor must be warmed up at least 12 hours to prevent breakdown.

4.If the insulation resistance rises above 1 MΩ, the compressor is not faulty.

Caution:

•The compressor will not operate unless the power supply phase connection is correct.

•Turn on the power at least 12 hours before starting operation.

-Starting operation immediately after turning on the main power switch can result in severe damage to internal parts. Keep the power switch turned on during the operational season.

► The followings must be checked as well.

•The outdoor unit is not faulty. LED on the control board of the outdoor unit flash when the outdoor unit is faulty.

•Both the gas and liquid stop valves are completely open.

8.2.Test run

8.2.1. Using remote controller

Refer to the indoor unit installation manual.

•Be sure to perform the test run for each indoor unit. Make sure each indoor unit operates properly following the installation manual attached to the unit.

•If you perform the test run for all indoor units at once, you cannot detect any

erroneous connection, if any, of the refrigerant pipes and the connecting wires.

* The compressor operation is not available for 3 minutes at least after the power is supplied.

•The compressor can emit noise just after turn on the power supply or in case of low outside air temperature.

About the restart protective mechanism

Once the compressor stops, the restart preventive device operates so the compressor will not operate for 3 minutes to protect the air conditioner.

8.2.2. Using SW3 in outdoor unit

Note:

In case of the test run from outdoor unit, all indoor units operate. Therefore, you can not detect any erroneous connection of refrigerant pipes and the connecting wires. If it aims at detection of any erroneous connection, be sure to carry out the test run from remote controller with reference to “8.2.1.

Using remote controller”.

	SW3-1	ON	Cooling operation
	SW3-2	OFF
	SW3-1	ON	Heating operation
	SW3-2	ON

* After performing the test run, set SW3-1 to OFF.

• A few seconds after the compressor starts, a clanging noise may be heard from the inside of the outdoor unit. The noise is coming from the check valve due to the small difference in pressure in the pipes. The unit is not faulty.

The test run operation mode cannot be changed by DIP switch SW3-2 during the test run. (To change the test run operation mode during the test run, stop the test run by DIP switch SW3-1. After changing the test run operation mode, resume the test run by switch SW3-1.)

8.3.Refrigerant collecting (Pump down)

Perform the following procedures to collect the refrigerant when moving the indoor unit or the outdoor unit.

1 Turn off the circuit breaker.

2Connect the low pressure side of the gauge manifold to the service port of the gas side stop valve.

3 Close the liquid stop valve.

4Supply power (circuit breaker).

*Start-up of the indoor-outdoor communication takes about 3 minutes after the power (circuit breaker) is turned on. Start the pump-down operation 3 to 4

minutes after the power (circuit breaker) is turned ON.

5Confirm that SW3-2 is set to OFF, and then set SW3-1 to ON to perform the test run for cooling operation. The compressor (outdoor unit) and ventilators (indoor and outdoor units) start operating and test run for cooling operation begins. Immediately after performing the test run for cooling operation, set the outdoor service switch SW2-4 (pump down switch) from OFF to ON.

* Do not continue to operate for a long time with the switch SW2-4 set to ON.

Make sure to switch it to OFF after pump down is completed.

6 Fully close the gas stop valve when the pressure reading on the gauge drops 7.1 - 0.0 PSIG (approximately 0.5 - 0.0 kgf/cm2)

7 Set SW3-1 to OFF to stop the air conditioner operation. (Set the outdoor service switch SW2-4 from ON to OFF.)

8Turn off the power supply (circuit breaker).

*If too much refrigerant has been added to the air conditioner system, the pressure may not drop to 7.1 PSIG (0.5 kgf/cm2). If this occurs, use a refrigerant collecting device to collect all of the refrigerant in the system, and then recharge the system with the correct amount of refrigerant after the indoor and outdoor units have been relocated.

Warning:

When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes. The compressor may burst and cause injury if any foreign substance, such as air, enters the system.

16