Mitsubishi PUZ-A12NHA, PUZ-A·NHA-BS, PUZ-A18NHA, PUZ-A24NHA, PUZ-A30NHA Installation Manual

Air-Conditioners

PUZ-A
PUY-A

·NHA, PUZ-A·NHA-BS

·NHA, PUY-A·NHA-BS

English

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INSTALLATION MANUAL

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

MANUAL DE INSTALACIÓN

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

FOR INSTALLER

PARA EL INSTALADOR

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ППЛУИО¿

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English

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Contents

1. Safety precautions ................................................................................... 2

2. Installation location .................................................................................. 3

3. Installing the outdoor unit ......................................................................... 4

4. Installing the refrigerant piping ................................................................. 5

5. Drainage piping work ............................................................................... 7

1. Safety precautions

s Before installing the unit, make sure you read all the “Safety precau-

tions”.

s Please report to or take consent by the supply authority before connec-

tion 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.

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.

6. Electrical work .......................................................................................... 7

7. Test run .................................................................................................... 9

8. Special Functions .................................................................................. 10

9. System control (Fig. 9-1) ........................................................................ 10

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.

• 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 connections must be made securely
without tension on the terminals. If the cables are connected or installed in­correctly, overheating or fire may result.

• 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 moving the air conditioner, 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. Air enclosed in the lines can
cause pressure peaks resulting in a rupture and other hazards.

• 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.

1.2. Before installation (relocation)

Caution:

• Be extremely careful when transporting the units. Two or more persons are
needed to handle the unit, as it weighs 20 kg, 44 Ibs 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 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.

2

• When installing the unit in a hospital or communications office, be prepared
for noise and electronic interference. Inverters, home appliances, high-fre­quency 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 communications equip­ment, harming the screen display quality.

• 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.

1. Safety precautions

D

E

C

B

A

37-13/32

13+1-3/16

37-1/8(53-5/32)

6-7/8

23-5/8

14-9/16

31-1/2

11-13/16+29/32

23-5/8

5-29/32

2-23/32

19-11/16

13

1.3. Before electric work

Caution:

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

• 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.

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.

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 5) 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 5)

• 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.

• 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.

• 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 five minutes before turning
off the main power switch. Otherwise, water leakage or breakdown 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 location

Fig. 2-1

Fig. 2-2

2.1. Refrigerant pipe (Fig. 2-1)

s Check that the difference between the heights of the indoor and outdoor

units, the length of refrigerant pipe, and the number of bends in the pipe are
within the limits shown below.

Models

A12, A18 Max. 30 m, 100 ft Max. 30 m, 100 ft Max. 15

A24, A30, A36, A42

• Height difference limitations are binding regardless of which unit, indoor or outdoor,
is positioned higher.

D Indoor unit
E Outdoor unit

■ A24, A30, A36, A42 (inch)■ A12, A18 (inch)

2.2. 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.

A Pipe length B Height C Number of

(one way) difference bends (one way)

Max. 50 m, 165 ft Max. 30 m, 100 ft Max. 15

2.3. Outline dimensions (Outdoor unit) (Fig. 2-2)

The figure in parenthesis is for A42 model.

3

B

2. Installation location

A

B

A

C

D

19-11/16 19-11/16

Min. 25-19/32

5-29/32 5-29/32

Min. 13-25/32

31-1/2

1-9/32

11-13/16

13

23-5/8 23-5/8

Min. 14-3/16

6-7/8 6-7/8

Min. 13/32

37-13/32

1-3/32

13

14-9/16

D

Fig. 2-3

Fig. 2-4

Fig. 2-5

2.4. Ventilation and service space

2.4.1. 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 three examples of precautions against strong winds.
1 Face the air outlet towards the nearest available wall about 50 cm, 19-11/16 inch

away from the wall. (Fig. 2-3)

2 Install an optional air outlet guide and air guide if the unit is installed in a location

where strong winds from a typhoon, etc. may directly enter the air outlet. (Fig. 2-4)

A Air outlet guide

3 Position the unit so that the air outlet blows perpendicularly to the seasonal wind

direction, if possible. (Fig. 2-5)

B Wind direction

3. Installing the outdoor unit

2.4.2. When installing a single outdoor unit (Refer to the last page)

Minimum dimensions are as follows, except for Max., meaning Maximum dimensions,
indicated.
The figures in parentheses are for A42 models.
Refer to the figures for each case.

1 Obstacles at rear only (Fig. 2-6)
2 Obstacles at rear and above only (Fig. 2-7)
3 Obstacles at rear and sides only (Fig. 2-8)

∗ 350mm, 13-25/32 inch for A12, A18

4 Obstacles at front only (Fig. 2-9)

∗ When using an optional air outlet guide, the clearance for A42 models is 500 mm,

19-11/16 inch or more.

5 Obstacles at front and rear only (Fig. 2-10)

∗ When using an optional air outlet guide, the clearance for A42 models is 500 mm,

19-11/16 inch or more.

6 Obstacles at rear, sides, and above only (Fig. 2-11)

∗ 350 for A12, A18

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

2.4.3. When installing multiple outdoor units (Refer to the last page)

Leave 350 mm, 13-25/32 inch for A18 and 10 mm, 13/32 inch for A24-A42 space or
more between the units.

1 Obstacles at rear only (Fig. 2-12)
2 Obstacles at rear and above only (Fig. 2-13)

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

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

3 Obstacles at front only (Fig. 2-14)

∗ When using an optional air outlet guide, the clearance for A42 models is 1000 mm,

39-3/8 inch or more.

4 Obstacles at front and rear only (Fig. 2-15)

∗ When using an optional air outlet guide, the clearance for A42 models is 1000 mm,

39-3/8 inch or more.

5 Single parallel unit arrangement (Fig. 2-16)

∗ When using an optional air outlet guide installed for upward airflow, the clearance is 500

(1000) mm, 19-11/16 (39-3/8) inch or more.

6 Multiple parallel unit arrangement (Fig. 2-17)

∗ When using an optional air outlet guide installed for upward airflow, the clearance is 1000

(1500) mm, 39-3/8 (59-1/16) inch or more.

7 Stacked unit arrangement (Fig. 2-18)

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

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

shown.

Max. 23/32 for A12, A18

Max. 1-3/16 for A24-A42

A M10 (3/8”) bolt
B Base
C As long as possible.
D Vent

■ A24-A42■ A12, A18

Fig. 3-1

• Be sure to install the unit in a sturdy, level surface to prevent rattling noises during

(inch)

■ A24-A42■ A12, A18

(inch)

operation. (Fig. 3-1)

<Foundation specifications>

Foundation bolt M10 (3/8”)
Thickness of concrete 120 mm, 4-23/32 inch
Length of bolt 70 mm, 2-3/4 ing
Weight-bearing capacity 320 kg, 264 lbs

• Make sure that the length of the foundation bolt is within 30 mm, 1-3/16 inch of the
bottom surface of the base.

• Secure the base of the unit firmly with four-M10 foundation bolts in sturdy locations.

Installing the outdoor unit

• Do not block the vent. If the vent is blocked, operation will be hindered and break­down may result.

• In addition to the unit base, use the installation holes on the back of the unit to attach
wires, etc., if necessary to install the unit. Use self-tapping screws (ø5 × 15 mm,
ø13/16 × 19/32 inch or more) and install on site.

Warning:

• 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.

• 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.

4

4. Installing the refrigerant piping

90° ±0.5°

øA

R1/64 to R1/32

A

45°±2°

B

C

D

C

B

A

E

D

D

A Flare cutting dimensions
B Flare nut tightening torque

Fig. 4-1

A (Fig. 4-1)

Flare dimensions

øA dimensions

■ A24-A42■ A12, A18

Fig. 4-3

Copper pipe O.D.

(mm) (inch) (mm) (inch)

ø6.35 1/4” 8.7 - 9.1 11/32 - 23/64
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

B (Fig. 4-1)

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
ø9.52 3/8” 22 7/8 34 - 42 25 - 30
ø12.7 1/2” 26 1 - 3/64 49 - 61 35 - 44

ø15.88 5/8” 29 1 - 9/64 68 - 82 49 - 59

A Front piping cover
B Piping cover
C Stop valve
D Service panel
E Band radius : 100 mm, 3-15/16 inch-150 mm, 5-27/32 inch

(inch)

4.1. 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 moving the air conditioner, 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. Air enclosed in the lines can
cause pressure peaks resulting in a rupture and other hazards.

A12, A18 A24-A42

Liquid pipe

Gas pipe

• Do not use pipes thinner than those specified above.

ø6.35 mm, 1/4inch ø9.52 mm, 3/8 inch

thickness 0.8 mm, 1/32 inch thickness 0.8 mm, 1/32 inch

ø12.7 mm, 1/2 inch ø15.88 mm, 5/8 inch

thickness 0.8 mm, 1/32 inch thickness 1.0 mm, 3/64 inch

4.2. Connecting pipes (Fig. 4-1)

• When commercially available copper pipes are used, wrap liquid and gas pipes

with commercially available insulation materials (heat-resistant to 100 °C, 212 °F or
more, thickness of 12 mm, 1/2 inch or more).

• The indoor parts of the drain pipe should be wrapped with polyethylene foam insu-

lation materials (specific gravity of 0.03, thickness of 9 mm, 23/64 inch or more).

• Apply thin layer of refrigerant oil to pipe and joint seating surface before tightening

flare nut. A

• Use two wrenches to tighten piping connections. B

• Use leak detector or soapy water to check for gas leaks after connections are com-

pleted.

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

• Use the flare nuts for the following pipe size. D

Gas side Pipe size (mm, inch) ø12.7, 1/2”ø15.88, 5/8”

Liquid side Pipe size (mm, inch) ø6.35, 1/4”ø9.52, 3/8”

*1: The flare nut is attached to its pipe.
*2: The flare nut is in the outdoor unit accessory.

Do not use the flare nut attached. If it is used, a gas leakage or even a pipe
extraction may occur.

• When bending the pipes, be careful not to break them. Bend radii of 100 mm,

3-15/16 inch to 150 mm, 5-27/32 inch are sufficient.

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

may result.

1 Pipes must be connected starting from the indoor unit.

Flare nuts must be tightened with a torque wrench.

2 Flare the liquid pipes and gas pipes and apply a thin layer of refrigeration oil

(Applied on site).

A12, A18 A24, A42

4.3. Refrigerant piping (Fig. 4-3)

■ For A12, A18

Remove the service panel D (one screw).

■ For A24-A42

Remove the service panel D (three screws) and the front piping cover A (two screws)
and rear piping cover B (two screws).
1 Perform refrigerant piping connections for the indoor/outdoor unit when the out-

door unit’s stop valve is completely closed.

2 Vacuum-purge air from the indoor unit and the connection piping.
3 After connecting the refrigerant pipes, check the connected pipes and the indoor

unit for gas leaks. (Refer to 4.4 Refrigerant pipe airtight testing method)
4 Vacuumize the refrigerant lines through the service port of the liquid stop valve

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.

5 Use sealant to seal the ends of the thermal insulation around the pipe connection

sections to prevent water from entering the thermal insulation.

5

4. Installing the refrigerant piping

A

B

H

I

C

D

E
F

G

D

B

A

C

Fig. 4-5

A

B

C

D

E

F

I

J

J

A

B

K

D

E

F

I

Type A Type B

Fig. 4-6

B

G

H

E

D

A

I

J

F

E Local pipe

A Stop valve <Liquid side>
B Stop valve <Gas side>
C Service port
D Open/Close section

(1)

(2)

F Sealed, same way for gas side
G Pipe cover
H Do not use a wrench here.

Refrigerant leakage may result.

I Use two wrenches here.

Fig. 4-4

4.4. Refrigerant pipe airtight testing method

(1) Connect the testing tools.

• Make sure the stop valves A B are closed and do not open them.

• Add pressure to the refrigerant lines through the service port C of the liquid

stop valve D.

(2) Do not add pressure to the specified pressure all at once; add pressure little by little.

1 Pressurize to 0.5 MPa (5 kgf/cm

pressure does not decrease.

2 Pressurize to 1.5 MPa (15 kgf/cm2G), wait five minutes, and make sure the

pressure does not decrease.

3 Pressurize to 4.15 MPa (41.5 kgf/cm

perature 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, the pressure will change by
about 0.03 MPa (0.3 kgf/cm

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

source of the gas leak.

2

G), wait five minutes, and make sure the

2

G) and measure the surrounding tem-

2

G). Make the necessary corrections.

4.5. Stop valve opening method

(1) Gas side of A24-A42 (Fig. 4-5)
Type A
1 Remove the cap, then turn one-quarter rotation counter-clockwise with a flat-bladed

screwdriver to complete open.

2 Check that the valves are fully open, then return the cap to its original state and

tighten it down.
Type B
1 Remove the cap, pull the handle toward you and rotate 1/4 turn in a counterclock-

wise direction to open.
2 Make sure that the stop valve is open completely, push in the handle and rotate

the cap back to its original position.
(2) Liquid side of A24-A42 and Gas/Liquid side of A12, A18 (Fig. 4-6)
1 Remove the cap and turn the valve rod counterclockwise as far as it will go with

the use of a 4 mm hexagonal wrench. Stop turning when it hits the stopper.

(ø6.35, 1/4 inch: Approximately 4.5 revolutions) (ø9.52, 3/8 inch: Approximately

10 revolutions)
2 Make sure that the stop valve is open completely, push in the handle and rotate

the cap back to its original position.

A Valve

B Unit side

C Operation section

D Cap

E Local pipe side

F Pipe cover

G Service port

H Wrench hole

Refrigerant pipes are protectively wrapped for A24-A42

• The pipes can be protectively wrapped up to a diameter of ø90 mm, 3-35/64 inch

before or after connecting the pipes. Cut out the knockout in the pipe cover follow­ing the groove and wrap the pipes.

Pipe inlet gap for A24-A42

• 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.)

I Double spanner section

(Do not apply a spanner other than to this sec­tion. Doing so would cause coolant leaks.)

J Seal section

(Seal the end of the heat insulation material at
the pipe connection section with whatever seal
material you have on hand so that water does
not infiltrate the heat insulation material.)

K Handle

4.6. Addition of refrigerant

• Additional charging is not necessary if the pipe length does not exceed 20 m, 70 ft
for A12-A36, 30 m 100 ft for A42.

• If the pipe length exceeds the specified length above, charge the unit with addi­tional R410A refrigerant according to the permitted pipe lengths in the chart below.

* When the unit is stopped, charge the unit with the additional refrigerant through

the liquid stop valve after the pipe extensions and indoor unit have been
vacuumized.
When the unit is operating, add refrigerant to the gas check valve using a
safety charger. Do not add liquid refrigerant directly to the check valve.

Max height

difference

Max pipe

length

Model

A12, A18 30 m, 100 ft 30 m, 100 ft 0

A24, A30, A36 50 m, 165 ft 30 m, 100 ft 0

A42 50 m, 165 ft 30 m, 100 ft 0 0 0 0

6

* After charging the unit with refrigerant, note the added refrigerant amount on

the service label (attached to the unit).
Refer to the “1.5. Using R410A refrigerant air conditioners” for more informa­tion.

• Be careful when installing multiple units. Connecting to an incorrect indoor unit can
lead to abnormally high pressure and have a serious effect on operation perform­ance.

20 m 25 m 27 m 30 m 33.5 m 36.6 m 40 m 43 m 45.5 m 48.8 m 50 m

70 ft 80 ft 90 ft 100 ft 110 ft 120 ft 130 ft 140 ft 150 ft 160 ft 165 ft

0.06 kg 0.11 kg 0.17 kg
2 oz 4 oz 6 oz

0.17 kg 0.34 kg 0.51 kg 0.68 kg 0.85 kg 1.02 kg 1.19 kg 1.36 kg 1.53 kg 1.70 kg
6 oz 12 oz 18 oz 24 oz 30 oz 36 oz 42 oz 48 oz 54 oz 60 oz

Additional refrigerant charging amount (kg/oz)

–––––––

0.17 kg 0.34 kg 0.51 kg 0.68 kg 0.85 kg 1.02 kg 1.19 kg
6 oz 12 oz 18 oz 24 oz 30 oz 36 oz 42 oz

4. Installing the refrigerant piping

A

A

C

E

D

B

C

A

B

A

B

C

D

E

A

C

B

S3

S3

S2

S1

S2S1L1 L2

GR

D

E

E

D

E

C

B

A A

E E

L1GRL2 S1 S2 S3

E

B

A
F

C

L1GRL2 S1 S2 S3

B–C ≤ 8 m, 26 ftA24, A36 : A+B+C ≤ 50 m, 165 ft

Fig. 4-7

5. Drainage piping work

Outdoor unit drainage pipe connection

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

A12, A18 A24-A42
Drain socket PAC-SG61DS-E
Drain pan PAC-SG63DP-E PAC-SG64DP-E

4.7. For twin combination (For A24, A36 only)

Refrigerant piping limitation of length, height difference are shown in the figure. (Fig.
4-7)

A Indoor unit
B Outdoor unit
C Multi distribution pipe (option)
D Height difference (Indoor unit-Outdoor unit) Max. 30 m, 100 ft
E Height difference (Indoor unit-Indoor unit) Max. 1 m, 3 ft

6. Electrical work

6.1. Outdoor unit (Fig. 6-1, Fig. 6-2)

1 Remove the service panel.
2 Wire the cables referring to the Fig. 6-1 and the Fig. 6-2.

For Power

For Power

Fig. 6-1

A Indoor unit
B Outdoor unit
C Remote controller
D Main switch (Breaker)
E Earth

■ A12, A18

■ A24-A42

A Earth terminal
B Terminal block
C Clamp
D Service panel
E Wire the cables so that they do not

contact the center of the service
panel or the gas valve.

Fig. 6-2

7

■ A12, A18

CORD COVER

CONDUIT COVER

CABLE STRAP

TERMINAL BED

SERVICE PANEL

CONDUIT PLATE : accessory

GRL2L1 S1 S2 S3

■ A24–42

8