Panasonic CZ-P56SVK1U, S-07MD1U6, S-09MD1U6, S-12MD1U6, S-12MU1U6 installation

External diameter of service port R410A: 5/16"

NOTE

This air conditioner uses the refrigerant R410A.

INSTALLATION INSTRUCTIONS

Mini VRF System Air Conditioner

85464369529010

CV6233186870

Type

Type

Type

Mini VRF SystemU

U-36LE1U6 U-52LE1U6

U-36LE1U6E* U-52LE1U6E*

Outdoor Unit Type 5236

Outdoor Units

Model No.

*1 Necessary to install the External Electronic Expansion Valve Kit (Optional : CZ-P56SVK1U)

* Salt-Air Damage Resistant Specifications.

Indoor Unit Type 7 9 12 15 18

S-12MD1U6

S-09MD1U6S-07MD1U6

1-Way Cassette

D1

S-18MU1U6

S-12MU1U6

4-Way CassetteU1

Y1 4-Way Cassette 60 × 60 S-12MY1U6 S-18MY1U6

K1 Wall Mounted

S-07MK1U6 S-09MK1U6 S-12MK1U6 S-18MK1U6

S-18MT1U6

S-12MT1U6

Ceiling

T1

F1

Low Silhouette Ducted S-07MF1U6 S-09MF1U6 S-12MF1U6

S-15MF1U6 S-18MF1U6

S-07MM1U6

S-09MM1U6 S-12MM1U6

S-15MM1U6 S-18MM1U6M1 Slim Low Static Ducted

E1 High Static Pressure Ducted

S-18MP1U6S-15MP1U6

S-12MP1U6

S-09MP1U6

S-07MP1U6

S-18MR1U6

S-15MR1U6S-12MR1U6S-09MR1U6S-07MR1U6

Floor StandingP1

R1 Concealed Floor Standing

Indoor Unit Type

19 24 36 48 54

D1

1-Way Cassette

U1 4-Way Cassette

S-36MU1U6

Y1 4-Way Cassette 60 × 60

S-19MS1U6*

1

Wall Mounted

K1

T1 Ceiling S-24MT1U6

F1 Low Silhouette Ducted

S-24MF1U6

S-24MU1U6

S-24MK1U6

S-36MF1U6 S-48MF1U6 S-54MF1U6

M1 Slim Low Static Ducted

E1

High Static Pressure Ducted

S-36ME1U6 S-48ME1U6

P1 Floor Standing S-24MP1U6

S-24MR1U6

R1

Concealed Floor Standing

Indoor Units

IMPORTANT!
Please Read Before Starting

This air conditioning system meets strict safety and oper­ating standards. As the installer or service person, it is an
important part of your job to install or service the system so
it operates safely and efficiently.

For safe installation and trouble-free operation, you must:

Carefully read this instruction booklet before beginning.

Follow each installation or repair step exactly as shown.

Observe all local, state, and national electrical codes.

Pay close attention to all warning and caution notices
given in this manual.

This symbol refers to a hazard or
unsafe practice which can result
in severe personal injury or death.

This symbol refers to a hazard or
unsafe practice which can result
in personal injury or product or
property damage.

If Necessary, Get Help

These instructions are all you need for most installation
sites and maintenance conditions. If you require help for a
special problem, contact our sales/service outlet or your
certified dealer for additional instructions.

In Case of Improper Installation

The manufacturer shall in no way be responsible for
improper installation or maintenance service, including fail­ure to follow the instructions in this document.

SPECIAL PRECAUTIONS

WARNING

When Wiring

ELECTRICAL SHOCK CAN CAUSE
SEVERE PERSONAL INJURY OR DEATH.
ONLY A QUALIFIED, EXPERIENCED
ELECTRICIAN SHOULD ATTEMPT TO
WIRE THIS SYSTEM.

•
are completed or reconnected and checked.

•

Do not supply power to the unit until all wiring and tubing

Highly dangerous electrical voltages are used in this
system. Carefully refer to the wiring diagram and these
instructions when wiring. Improper connections and inad­equate grounding can cause accidental injury or death.

•

Ground the unit following local electrical codes.

•

Connect all wiring tightly. Loose wiring may cause over­heating at connection points and a possible fire hazard.

•

To prevent possible hazards from insulation failure,
the unit must be grounded.

When Installing…

When Connecting Refrigerant Tubing

Select an installation location which is rigid and strong
enough to support or hold the unit, and select a location
for easy maintenance.

…In a Room

Properly insulate any tubing run inside a room to prevent
“sweating” that can cause dripping and water damage to
walls and floors.

WARNING

CAUTION

WARNING

Keep the fire alarm and the air outlet at
least 5 feet away from the unit.

…In Moist or Uneven Locations

Use a raised concrete pad or concrete blocks to provide a
solid, level foundation for the outdoor unit. This prevents
water damage and abnormal vibration.

…In an Area with High Winds

Securely anchor the outdoor unit down with bolts and a
metal frame. Provide a suitable air baffle.

…In a Snowy Area (for Heat Pump-type Systems)

Install the outdoor unit on a raised platform that is higher
than drifting snow. Provide snow vents.

• When performing piping work
do not mix air except for speci­fied refrigerant (R410A) in
refrigeration cycle. It causes
capacity down, and risk of
explosion and injury due to high
tension inside the refrigerant
cycle.

• Refrigerant gas leakage may
cause fire.

• Do not add or replace refrigerant
other than specified type.
It may cause product damage,
burst and injury etc.

• Do not leak refrigerant while piping work for an
installation or re-installation, and while repairing
refrigeration parts.

Handle liquid refrigerant carefully as it may cause

frostbite.

• Ventilate the room well, in the event that is refrigerant
gas leaks during the installation. Be careful not to allow
contact of the refrigerant gas with a flame as this will
cause the generation of poisonous gas.

• Keep all tubing runs as short as possible.

• Use the flare method for connecting tubing.

• Apply refrigerant lubricant to the matching surfaces of
the flare and union tubes before connecting them, then
tighten the nut with a torque wrench for a leak-free con­nection.

• Check carefully for leaks before starting the test run.

CAUTION

When Transporting

Be careful when picking up and moving the indoor and
outdoor units. Get a partner to help, and bend your knees
when lifting to reduce strain on your back. Sharp edges or
thin aluminum fins on the air conditioner can cut your fingers.

2

3

Check of Density Limit

The room in which the air conditioner is to be
installed requires a design that in the event of refrig­erant gas leaking out, its density will not exceed a set
limit.

The refrigerant (R410A), which is used in the air condition­er, is safe, without the toxicity or combustibility of ammonia,
and is not restricted by laws imposed to protect the ozone
layer. However, since it contains more than air, it poses the
risk of suffocation if its density should rise excessively. Suf­focation from leakage of refrigerant is almost non-existent.
With the recent increase in the number of high density
buildings, however, the installation of multi air conditioner
systems is on the increase because of the need for effec­tive use of floor space, individual control, energy conserva­tion by curtailing heat and carrying power, etc.
Most importantly, the multi air conditioner system is able
to replenish a large amount of refrigerant compared to
conventional individual air conditioners. If a single unit of
the multi air conditioner system is to be installed in a
small room, select a suitable model and installation pro­cedure so that if the refrigerant accidentally leaks out, its
density does not reach the limit (and in the event of an
emergency, measures can be made before injury can
occur).

ASHRAE and the International Mechanical Code of the
ICC as well as CSA provide guidance and define safe­guards related to the use of refrigerants, all of which define
a Refrigerant Concentration Level (RCL) of 25 pounds
per 1,000 cubic feet for R410A refrigerant.
For additional guidance and precautions related to
refrigerant safety, please refer to the following documents:

International Mechanical Code 2009 (IMC-2009)
(or more recently revised)
ASHRAE 15
ASHRAE 34

When Servicing

• Turn the power OFF at the main power box (mains)
before opening the unit to check or repair electrical
parts and wiring.

•
parts.

•

Keep your fingers and clothing away from any moving

Clean up the site after you finish, remembering to check
that no metal scraps or bits of wiring have been left
inside the unit being serviced.

••Do not touch the air inlet or the
sharp aluminum fins of the
outdoor unit. You may get injured.

• Ventilate any enclosed areas when
installing or testing the refrigeration
system. Escaped refrigerant gas, on
contact with fire or heat, can produce
dangerously toxic gas.

Confirm after installation that no
refrigerant gas is leaking. If the gas
comes in contact with a burning stove,
gas water heater, electric room heater
or other heat source, it can cause the
generation of poisonous gas.

WARNING

• Do not clean inside the indoor and
outdoor units by users. Engage
authorized dealer or specialist for
cleaning.

• In case of malfunction of this
appliance, do not repair by yourself.
Contact to the sales dealer or service
dealer for a repair.

CAUTION

CAUTION

Others

•

•

•

Do not touch the air inlet or the
sharp aluminum fins of the
outdoor unit. You may get injured.

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

Do not stick any object into the
FAN CASE.
You may be injured and the
unit may be damaged.

4

1-2. Prevent impurities including water, dust and oxide from entering the tubing.Impurities can cause R410A

refrigerant deterioration and compressor defects. Due to the features of the refrigerant and refrigerating
machine oil, the prevention of water and other impurities becomes more important than ever.

2. Be sure to recharge the refrigerant only in liquid form.

2-1. Since R410A is a non-azeotrope, recharging the refrigerant in gas form can lower performance and cause

defects of the unit.

2-2. Since refrigerant composition changes and performance decreases when gas leaks, collect the remaining

refrigerant and recharge the required total amount of new refrigerant after fixing the leak.

3. Different tools required

3-1.Tool specifications have been changed due to the characteristics of R410A.

Some tools for R22- and R407C-type refrigerant systems cannot be used.

Unit: in. (mm)

R407C tools

Item compatible Remarks

with R410A?

Manifold gauge Yes No Types of refrigerant, refrigerating machine oil, and

pressure gauge are different.

Charge hose Yes No To resist higher pressure, material must be changed.

Vacuum pump Yes Yes Use a conventional vacuum pump if it is equipped

with a check valve. If it has no check valve,
purchase and attach a vacuum pump adapter.

Leak detector Yes No Leak detectors for CFC and HCFC that

react to chlorine do not function because
R410A contains no chlorine. Leak detector
for HFC134a can be used for R410A.

Flaring oil Yes No For systems that use R22, apply mineral oil (Suniso oil)

to the flare nuts on the tubing to prevent refrigerant
leakage. For machines that use R407C or R410A, apply
synthetic oil (ether oil) to the flare nuts.

Precautions for Installation Using New Refrigerant

1. Care regarding tubing

1-1. Process tubing

●

Material: Use C1220 phosphorous deoxidized copper specified in JIS H3300 “Copper and Copper Alloy Seamless
Pipes and Tubes.”

●

Tubing size: Be sure to use the sizes indicated in the table below.

●

Use a tube cutter when cutting the tubing, and be sure to remove any flash.This also applies to distribution joints
(optional).

●

When bending tubing, use a bending radius that is 4 times the outer diameter of the tubing or larger.

* Using tools for R22 and R407C and new tools for R410A together can cause defects.

CAUTION

Use sufficient care in handling the tubing. Seal the tubing ends with
caps or tape to prevent dirt, moisture, or other foreign substances
from entering.These substances can result in system malfunction.

Material O

Copper tube

Outer diameter 1/4 (6.35) 3/8 (9.52) 1/2 (12.7) 5/8 (15.88) 3/4 (19.05)

Wall thickness 1/32 (0.8) 1/32 (0.8) 1/32 (0.8) 5/128 (1.0) 5/128 (1.0)

New
tool?

Manifold gauge

Vacuum pump

Outlet
Inlet

5

3-2. Use R410A exclusive cylinder only.

Single-outlet valve

(with siphon tube)
Liquid refrigerant should be recharged
with the cylinder standing on end as
shown.

New refrigerant R410A cannot be used for
earlier models

1. Compressor specifications are different.

If recharging a R22 or R407C compressor with
R410A, durability will significantly decrease since
some of the materials used for compressor parts are
different.

2. Existing tubing cannot be used (especially R22).

Completely cleaning out residual refrigerating

machine oil is impossible, even by flushing.

3. Refrigerating machine oil differs (R22).

Since R22 refrigerating machine oil is mineral oil, it
does not dissolve in R410A.Therefore, refrigerating
machine oil discharged from the compressor can
cause compressor damage.

R22 refrigerating machine oil Mineral oil (Suniso oil)

R407C refrigerating machine oil Synthetic fluid (ether oil)

R410A refrigerating machine oil Synthetic fluid (ether oil)

Valve

Liquid

4. ELECTRICAL WIRING . . . . . . . . . . . . . . . . . . 22

4-1. General Precautions on Wiring

4-2. Recommended Wire Length and Wire

Diameter for Power Supply System

4-3. Wiring System Diagram

5. HOW TO PROCESS TUBING . . . . . . . . . . . . . 26

5-1. Connecting the Refrigerant Tubing

5-2. Connecting Tubing Between Indoor and

Outdoor Units

5-3. Insulating the Refrigerant Tubing

5-4. Taping the Tubes

5-5. Finishing the Installation

6. AIR PURGING . . . . . . . . . . . . . . . . . . . . . . . . . 30

■

Air Purging with a Vacuum Pump (for Test Run)

Preparation

7. TEST RUN . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

7-1. Preparing for Test Run

7-2. Test Run Procedure

7-3. Outdoor Unit PCB Setting

7-4. Auto Address Setting

7-5. Caution for Pump Down

7-6. Meaning of Alarm Messages

Page

6

IMPORTANT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Please Read Before Starting

Check of Density Limit

Precautions for Installation Using New Refrigerant

1. GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1-1. Tools Required for Installation (not supplied)

1-2. Accessories Supplied

1-3. Type of Copper Tube and Insulation Material

1-4. Additional Materials Required for Installation

1-5. Tubing Size

1-6. Straight Equivalent Length of Joints

1-7. Additional Refrigerant Charge

1-8. System Limitations

1-9. Tubing Length

1-10. Check of Limit Density

1-11. Installing Distribution Joint

1-12. Optional Distribution Joint Kit

1-13. Example of Tubing Size Selection and

Refrigerant Charge Amount

2. SELECTING THE INSTALLATION SITE . . . . . 14

2-1. Outdoor Unit

2-2. Air-Discharge Chamber for Top Discharge

2-3. Installing the Unit in Heavy Snow Areas

2-4. Precautions for Installation in Heavy Snow

Areas

2-5. Dimensions of Air-Discharge Chamber

2-6. Dimensions of Outdoor Unit with

Air-Discharge Chamber (field supply)

2-7. Dimensions of Snow Ducting

2-8. Dimensions of Outdoor Unit with Snow-Proof

Ducting (field supply)

3. HOW TO INSTALL THE OUTDOOR UNIT . . . 21

3-1. Installing the Outdoor Unit

3-2. Drainage Work

3-3. Routing the Tubing and Wiring

CONTENTS

Page

7

1. GENERAL

This booklet briefly outlines where and how to install
the air conditioning system. Please read over the entire
set of instructions for the outdoor unit and make sure all
accessory parts listed are with the system before
beginning.

1-1. Tools Required for Installation (not supplied)

1. Flathead screwdriver

2. Phillips head screwdriver

3. Knife or wire stripper

4. Tape measure

5. Level gauge

6. Sabre saw or key hole saw

7. Hacksaw

8. Core bits

9. Hammer

10. Drill

11. Tube cutter

12. Tube flaring tool

13. Torque wrench

14. Adjustable wrench

15. Reamer (for deburring)

1-2. Accessories Supplied

See Table 1-1.

1-3. Type of Copper Tube and Insulation Material

If you wish to purchase these materials separately from
a local source, you will need:

1. Deoxidized annealed copper tube for refrigerant tub­ing.

2. Foamed polyethylene insulation for copper tubes as
required to precise length of tubing.Wall thickness of
the insulation should be not less than 5/16".

3. Use insulated copper wire for field wiring. Wire size
varies with the total length of wiring.
Refer to

4. ELECTRICAL WIRING for details.

1-4. Additional Materials Required for Installation

1. Refrigeration (armored) tape

2. Insulated staples or clamps for connecting wire (See
your local codes.)

3. Putty

4. Refrigeration tubing lubricant

5. Clamps or saddles to secure refrigerant tubing

6. Scale for weighing

CAUTION

Check local electrical codes
and regulations before
obtaining wire. Also, check
any specified instructions or
limitations.

Table 1-1 (Outdoor Unit)

Part name

Figure

U-36LE1U6
U-36LE1U6E

(4 hp)

Q’ty

U-52LE1U6
U-52LE1U6E

(6 hp)

Tube Discharge
Assy

Instruction manualpaper

0

1

1

1

hp = horsepower

8

1-7. Additional Refrigerant Charge

Additional refrigerant charge amount is calculated from the liquid tubing total length as follows.

Table 1-7 Amount of Refrigerant Charge Per ft., According to Liquid Tubing Size

Liquid tubing size Amount of refrigerant

(in. (mm)) charge (oz/ft.)

ø1/4" (ø6.35) 0.279

ø3/8" (ø9.52) 0.602

Required amount of charge = (Amount of refrigerant
charge per ft. of each size of liquid tube × its tube
length) + (...) + (...)

*Always charge accurately using a scale for weighing.

Table 1-6 Required Copper Tubing Dimensions Unit: in. (mm)

Gas tubing size (in. (mm))

90° elbow

45° elbow

U-shape tube bend (R2-3/8" – 4" (60 – 100))

Trap bend

1/2" (12.7)

1

0.8

3

7.5

5/8" (15.88)

1.1

0.9

3.4

9.2

3/4" (19.05)

1.4

1

4.1

10.5

Y-branch distribution joint Equivalent length conversion not needed.

Ball valve for service Equivalent length conversion not needed.

1-6. Straight Equivalent Length of Joints

Design the tubing system by referring to the following table for the straight equivalent length of joints.

Table 1-5 Straight Equivalent Length of Joints Unit: ft.

Material O

Copper tube

Outer diameter 1/4 (6.35) 3/8 (9.52) 1/2 (12.7) 5/8 (15.88) 3/4 (19.05)

Wall thickness 1/32 (0.8) 1/32 (0.8) 1/32 (0.8) 5/128 (1.0)

over 5/128 (1.0)

Table 1-4 Indoor Unit Tubing Connection (1,2...

n–1

)

1-5. Tubing Size

Table 1-2 Main Tubing Size (LA)

System horsepower

Table 1-3 Main Tubing Size After Distribution (LB, LC...)

Note: In case the total capacity of connected indoor units exceeds the total capacity of the outdoor units, select the main

tubing size for the total capacity of the outdoor units.

Note: If the system consists of only one indoor unit with an outdoor 6HP (Type 52), the main tube of the unit (LA) should be ø19.05.

Convert ø19.05 to ø15.88 using a reducer (field supply) close to the indoor unit and then make the connection.

Gas tubing

Liquid tubing

BTU/h (kW)

38,200 (11.2)

4

ø5/8" (ø15.88)

ø3/8" (ø9.52)

52,900 (15.5)

6

ø3/4" (ø19.05)

Unit: in. (mm)

Total capacity
after distribution

Tubing size

Over BTU/h

Gas tubing

Liquid tubing

24,200 (2.5 hp)–38,200 (4 hp) 47,800 (5 hp) 52,900 (6 hp)Below BTU/h

24,200 (2.5 hp)

ø5/8" (ø15.88)ø1/2" (ø12.7) ø3/4" (ø19.05)

ø3/8" (ø9.52) ø3/8" (ø9.52)

Unit: in. (mm)

hp = horsepower

Indoor unit type 7 9 12 15 18 19 24 36 48 54

Gas tubing

Liquid tubing

o1/2" (o12.7)

o1/4" (o6.35)

o5/8" (o15.88)

o3/8" (o9.52)

Unit: in. (mm)

9

1-9. Tubing Length

Table 1-10 Ranges that Apply to Refrigerant Tubing Lengths and to Differences in Installation Heights

R410A distribution joint
CZ-P160BK1U (for indoor unit)

Note: Do not use commercially available T-joints for the liquid tubing.

H2

LD

L1
L2

LC LB

LA

* Be sure to use special R410A distribution joints (CZ: purchased separately) for outdoor

unit connections and tubing branches.

Main tube of unit

1st branch

Unit distribution tube

1

2 3

n-1

n

L3

H1

Select the installation location so that the length and size of refrigerant tubing are within the allowable range shown
in the figure below.

1-8. System Limitations

Table 1-9 System Limitations

Table 1-8 Refrigerant Charge Amount at Shipment (for outdoor unit)

Heat pump unit

(Single-phase)

(oz)

U-36LE1U6

U-36LE1U6E

123

U-52LE1U6

U-52LE1U6E

123

Outdoor units

Number of max. connectable indoor units

Max. allowable indoor/outdoor capacity ratio

U-36LE1U6

U-36LE1U6E

6

U-52LE1U6

U-52LE1U6E

9

50 – 130%

Items Marks Contents Length (ft.)

Allowable tubing
length

Allowable elevation
difference

L = Length, H = Height

1

L1 Max. tubing length

Actual length 492

Equivalent length 574

L (L2 – L3 )

Difference between max. length and min.
length from the No.1 distribution joint

Max. length of main tubing (at max. diameter)LA

...

1, 2

+2+...

n

n–1

Max. length of each distribution tube

Total max. tubing length including length of

+L1

each distribution tube (only narrow tubing)

When outdoor unit is installed higher than indoor unit 164

H1

When outdoor unit is installed lower than indoor unit 131

H2 Max. difference between indoor units 49

>

>

>

131

>

262

>

98

>

656

>

>

>

WARNING

Always check the gas density
limit for the room in which the
unit is installed.

1-10. Check of Limit Density

When installing an air conditioner in a room, it is neces­sary to ensure that even if the refrigerant gas accidentally
leaks out, its density does not exceed the limit level for
that room.

1-11. Installing Distribution Joint

(1) Refer to “HOW TO ATTACH DISTRIBUTION JOINT”

enclosed with the optional distribution joint kit
(CZ-P160BK1U).

(2) In order to prevent accumulation of refrigerant oil in

stopped units, if the main tubing is horizontal then each
branch tubing length should be at an angle that is
greater than horizontal. If the main tubing is vertical,
provide a raised starting portion for each branch.

(3) If there are height differences between indoor units or if

branch tubing that follows a distribution joint is connect­ed to only 1 unit, a trap or ball valve must be added to
that distribution joint. (When adding the ball valve,
locate it within 1.3 ft. of the distribution joint.)

If a trap or ball valve is not added, do not operate
the system before repairs to a malfunctioning unit
are completed. (The refrigerant oil sent through the
tubing to the malfunctioning unit will accumulate
and may damage the compressor.)

15 to 30°

B

A

B

A

Tube branching methods (horizontal use)

Arrow view

Horizontal
line

View as seen
from arrow

Types of vertical trap specifications

(When using ball valve)

Main tubing

Ball valve

(BV: purchased

separately)

Indoor unit (1)

Indoor unit (more than 2 units)
(If only 1 unit is connected,
a ball valve is also needed on this side.)

(When not using ball valve)

Main tubing

Indoor unit is directed downward

More than
8 in.

Horizontal

Indoor unit

(Each unit is connected to
tubing that is either level
or is directed downward.)

Branch tubing is
directed upward.

CAUTION

Pay special attention to any
location, such as a basement,
etc., where leaking refrigerant
can accumulate, since refrig­erant gas is heavier than air.

10

11

CZ-P160BK1U

Use: For indoor unit (Capacity after distribution joint is 76,400 BTU/h (22.4 kW) or less.)

Table 1-12 Size of connection point on each part (Shown are inside diameters of tubing)

Size Part A Part B Part C Part D Part E

in. (mm)

ø3/4" ø5/8" ø1/2" ø3/8" ø1/4"

(ø19.05) (ø15.88) (ø12.7) (ø9.52) (ø6.35)

1-12. Optional Distribution Joint Kit

See the installation instructions packaged with the distribution joint kit for the installation procedure.

Table 1-11

Model name Cooling capacity after distribution Remarks

CZ-P160BK1U 76,400 BTU/h (22.4 kW) or less For indoor unit

Unit: in.

Example

B

A

Distribution
Joint

Gas tube Liquid tube

B

4-21/64

3-13/16

B

C

C

A

2-53/64

D

Distribution
Joint

C

C

4-21/64

3-13/16

C

D
E

DE

2-53/64

Insulation

Insulation

12

1-13. Example of Tubing Size Selection and Refrigerant Charge Amount

Additional refrigerant charging

Based on the values in Tables 1-2, 1-3, 1-4 and 1-7, use the liquid tubing size and length, and calculate the amount
of additional refrigerant charge using the formula below.

= 0.602

× (a) + 0.279 × (b)

(a): Liquid tubing Total length of ø3/8" (ft.) (b): Liquid tubing Total length of ø1/4" (ft.)

●

Charging procedure

Be sure to charge with R410A refrigerant

in liquid form.

1. After performing a vacuum, charge with refrigerant from the liquid tubing side. At this time, all valves must be
in the “fully closed” position.

2. If it was not possible to charge the designated amount, operate the system in Cooling mode while charging
with refrigerant from the gas tubing side. (This is performed at the time of the test run. For this, all valves
must be in the “fully open” position.)
Charge with R410A refrigerant in liquid form.
With R410A refrigerant, charge while adjusting the amount being fed a little at a time in order to prevent
liquid refrigerant from backing up.

●

After charging is completed, turn all valves to the “fully open” position.

●

Replace the tubing covers as they were before.

Required additional
refrigerant charge (oz)

CAUTION

1. R410A additional charging absolutely must be done through liquid charging.

2. The R410A refrigerant cylinder has a gray base color, and the top part is pink.

3. The R410A refrigerant cylinder includes a siphon tube. Check that the siphon
tube is present. (This is indicated on the label at the top of the cylinder.)

4. Due to differences in the refrigerant, pressure, and refrigerant oil involved in
installation, it is not possible in some cases to use the same tools for R22 and
for R410A.

1

3

4

2

Tightening torque for valve stem cap: 160 – 180 lbs · in.

Tightening torque for valve stem cap: 240 – 280 lbs

·

in.

Tightening torque: 300 – 360 lbs

·

in.

Tightening torque: 590 – 710 lbs

·

in.

● Obtain charge amount for each tubing size

Note that the charge amounts per 3.3 ft. are different for each liquid tubing size.
ø3/8" (ø9.52) → LA + LB + LC + LD : 212 ft.× 0.602 oz/ft. = 127 oz
ø1/4" (ø6.35) → 1 + 2 + 3 + 4 + 5 : 75 ft. × 0.279 oz/ft. = 20 oz

Total 147 oz

Additional refrigerant charge amount is 147 oz.

Be sure to check the limit
density for the room in which
the indoor unit is installed.

CAUTION

●

Example of each tubing length

Main tubing Distribution joint tubing

LA = 131 ft. Indoor side
LB = 16 ft. 1 = 16 ft. 4 = 20 ft.
LC = 16 ft. 2 = 16 ft. 5 = 16 ft.
LD = 49 ft. 3 = 7 ft.

Main tube of unit

Example:

13

1st branch

Unit distribution tube

LA

L1
L2

LC LB

1

2 3

LN

n

n–1

7 type 9 type 12 type 18 type

18 type

*4

*1

*2

*3

*1

More than 25/64" More than 25/64"

(field supply)

A

B

(Ground)

(Obstruction above unit)

Inlet side
More than 8 in.

(Obstruction on
inlet side)

Air direction chamber

Outlet side
More than

3.3 ft.

Inlet side C

2. SELECTING THE INSTALLATION SITE

2-1. Outdoor Unit

AVOID:

●

heat sources, exhaust fans, etc. (Fig. 2-1)

●

damp, humid or uneven locations

DO:

●

choose a place as cool as possible.

●

choose a place that is well ventilated and outside
air temperature does not exceed maximum 113°F
constantly.

●

allow enough room around the unit for air intake/
exhaust and possible maintenance.(Fig. 2-2)

●

use lug bolts or equal to bolt down unit, reducing
vibration and noise.

Installation space

Distance between obstructions and the unit air inlet
and outlet must be as shown below.

Fig. 2-1

Fig. 2-3

In case of multiple installations

●

provide a solid base (concrete block, 4 ×16 in.
beams or equal), a minimum of 6 in. above ground
level to reduce humidity and protect the unit against
possible water damage and decreased service life.
(Fig. 2-4)

●

use lug bolts or equal to bolt down unit, reducing
vibration and noise.

CAUTION

● Concerning inlet-side distance “C” (Fig. 2-2)

The minimum for distance “C” is 6 in. if there are no obstructions on the outlet side
(wall *1 side) and *2 or *4 is not present. In all other cases, the minimum for distance
“C” is 8 in.

● If the unit is installed with the outlet side facing wall *1, then there must be no obstruc-

tions on 2 of the remaining 3 sides: *2, *3, *4.

● If wall *1 is on the outlet side (Fig. 2-2), or if obstructions are present on all 3 sides *2,

*3, and *4 (Fig. 2-2), then the minimum distance for “A” and “B” is 6.6 ft. (Fig.2-4).
Even if there is no wall on the outlet side, a minimum of 3.3 ft.is required.

Fig. 2-2

14

Fig. 2-4

Exhaust fan

Hot air

Heat source

Out­door
unit

Anchor bolts
(4 pieces)

Fig. 2-5

Fig. 2-6

Fig. 2-7

2-2. Air Discharge Chamber for Top Discharge

Be sure to install an air discharge chamber (field sup­ply) in the field when:

●

it is difficult to keep a space of min. 20 in. between
the air discharge outlet and an obstacle.

●

the air discharge outlet is facing a sidewalk and
discharged hot air may annoy passers-by.
Refer to Fig. 2-5.

2-3. Installing the Unit in Heavy Snow Areas

In locations with strong wind, snow-proof ducting
(field supply) should be fitted and direct exposure to
the wind should be avoided as much as possible.

■■

Countermeasures against snow and wind

In regions with snow and strong wind, the following
problems may occur when the outdoor unit is not pro­vided with a platform and snow-proof ducting:

a) The outdoor fan may not run and damage to the

unit may occur.

b) There may be no air flow.

c) The tubing may freeze and burst.

d) The condenser pressure may drop because of

strong wind, and the indoor unit may freeze.

2-4. Precautions for Installation in Heavy Snow

Areas

(1) The platform should be higher than the max. snow

depth. (Fig.2-6)

(2) The 2 anchoring feet of the outdoor unit should be

used for the platform, and the platform should be
installed beneath the air intake side of outdoor
unit.

(3) The platform foundation must be firm and the unit

must be secured with anchor bolts.

(4) In case of installation on a roof subject to strong

wind, countermeasures must be taken to prevent
the unit from being blown over.

In regions with significant snowfall, the outdoor unit should
be provided with a platform and snow-proof ducting.

Without snow­proof ducting
(Low platform)

With snow­proof ducting
(High platform)

15

Air discharge

Outdoor
Unit

Duct

Air
Intake