Page 1
INSTALLATION INSTRUCTIONS
3WAY VRF System Air Conditioner
This air conditioner uses the refrigerant R410A.
NOTE
External diameter of service port R410A: 5/16"
Model No.
Outdoor Units
Type Outdoor Unit Type 72 96
U 3WAY VRF System
* Salt-Air Damage Resistant Specifi cations.
Indoor Units
Type Indoor Unit Type 7 9 12 15 18
D1 1-Way Cassette S-07MD1U6 S-09MD1U6 S-12MD1U6
U1 4-Way Cassette S-12MU1U6 S-18MU1U6
Y1 4-Way Cassette 60 × 60 S-12MY1U6 S-18MY1U6
K1 Wall Mounted S-07MK1U6 S-09MK1U6 S-12MK1U6 S-18MK1U6
T1 Ceiling S-12MT1U6 S-18MT1U6
F1 Low Silhouette Ducted S-07MF1U6 S-09MF1U6 S-12MF1U6 S-15MF1U6 S-18MF1U6
M1 Slim Low Static Ducted S-07MM1U6 S-09MM1U6 S-12MM1U6 S-15MM1U6 S-18MM1U6
E1 High Static Pressure Ducted
P1 Floor Standing S-07MP1U6 S-09MP1U6 S-12MP1U6 S-15MP1U6 S-18MP1U6
R1 Concealed Floor Standing S-07MR1U6 S-09MR1U6 S-12MR1U6 S-15MR1U6 S-18MR1U6
U-72MF1U9 U-96MF1U9
U-72MF1U9E* U-96MF1U9E*
Type Indoor Unit Type 19 24 36 48 54
D1 1-Way Cassette
U1 4-Way Cassette S-24MU1U6 S-36MU1U6
Y1 4-Way Cassette 60 × 60
K1 Wall Mounted S-19MS1U6*
T1 Ceiling S-24MT1U6
F1 Low Silhouette Ducted S-24MF1U6 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
R1 Concealed Floor Standing S-24MR1U6
1
S-24MK1U6
*1 Necessary to install the External Electronic Expansion Valve Kit (Optional : CZ-P56SVK1U)
85464369528012 CV6233186887
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Page 2
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 effi ciently.
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
WARNING
CAUTION
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
certifi ed 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
Do not supply power to the unit until all wiring and tubing •
are completed or reconnected and checked.
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 fi re
hazard.
To prevent possible hazards from insulation failure, •
the unit must be grounded.
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
When Wiring
ELECTRICAL SHOCK CAN CAUSE
SEVERE PERSONAL INJURY OR DEATH.
ONLY A QUALIFIED, EXPERIENCED
ELECTRICIAN SHOULD ATTEMPT TO
WIRE THIS SYSTEM.
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.
thin aluminum fi ns on the air conditioner can cut your
fi ngers.
When Installing…
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 fl oors.
Keep the fi re alarm and the air
CAUTION
…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 baffl e.
…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.
outlet at least 5 feet away from the
unit.
When Connecting Refrigerant Tubing
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 fl ame as this will
cause the generation of poisonous gas.
Keep all tubing runs as short as possible.•
Use the fl are method for connecting tubing.•
Apply refrigerant lubricant to the matching surfaces of •
the fl are 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.•
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
WARNING
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.
refrigerant cycle.
Refrigerant gas leakage may •
cause fi re.
Do not add or replace refrigerant •
other than specifi ed type. It may
cause product damage, burst and
injury etc.
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Page 3
When Servicing
Turn the power OFF at the main power box (mains) •
before opening the unit to check or repair electrical
parts and wiring.
Keep your fi ngers and clothing away from any moving •
parts.
Clean up the site after you fi nish, remembering to check •
that no metal scraps or bits of wiring have been left
inside the unit being serviced.
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.
Others
CAUTION
CAUTION
Do not touch the air inlet or the •
sharp aluminum fi ns 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 fi re or heat, can produce
dangerously toxic gas.
Confi rm 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.
Do not touch the air inlet or the •
sharp aluminum fi ns 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.
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 fl oor 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 defi ne
safeguards related to the use of refrigerants, all of which
defi ne 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
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Page 4
Precautions for Installation Using New Refrigerant
CAUTION
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.”
For tubes of ø7/8" (ø22.22 mm) or larger, use C1220 T-1/2H material or H material, and do not bend the 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.
Use suffi cient 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
Copper tube
Copper tube
can result in system malfunction.
Material O
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)
Material 1/2 H, H
Outer diameter
Wall thickness
7/8 (22.22) 1 (25.4) 1-1/8 (28.58) 1-1/4 (31.75) 1-1/2 (38.1) 1-5/8 (41.28)
5/128 (1.0) 5/128 (1.0) 5/128 (1.0) 3/64 (1.1)
Unit: in. (mm)
over 5/128 (1.0)
over 3/64 (1.15) over 3/64 (1.20)
Unit: in. (mm)
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
in 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.
R407C tools
New
Item
Manifold gauge Yes No Types of refrigerant, refrigerating machine oil, and
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
Leak detector Yes No Leak detectors for CFC and HCFC that react to
Flaring oil Yes No For systems that use R22, apply mineral oil (Suniso
* Using tools for R22 and R407C and new tools for R410A together can cause defects.
tool?
compatible
with R410A?
pressure gauge are different.
with a check valve. If it has no check valve,
purchase and attach a vacuum pump adapter.
chlorine do not function because R410A contains no
chlorine. Leak detector for HFC134a can be used for
R410A.
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.
Remarks
Manifold gauge
Vacuum pump
Outlet
Inlet
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Page 5
3-2. Use R410A exclusive cylinder only.
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.
Valve
Single-outlet valve
(with siphon tube)
Liquid refrigerant should be recharged
with the cylinder standing on end as
shown.
Liquid
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)
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Page 6
CONTENTS
Page Page
IMPORTANT! ............................................................... 2
Please Read Before Starting
Check of Density Limit
Precautions for Installation Using New Refrigerant
New refrigerant R410A cannot be used for earlier models
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 Length
1-6. Tubing Size
1-7. Straight Equivalent Length of Joints
1-8. Additional Refrigerant Charge
1-9. System Limitations
1-10. Installation Standards
1-11. Check of Limit Density
1-12. Installing Distribution Joint
1-13. Optional Distribution Joint Kits
1-14. Optional Solenoid Valve Kit
1-15. Example of Tubing Size Selection and
Refrigerant Charge Amount
2. SELECTING THE INSTALLATION SITE ............. 20
2-1. Outdoor Unit
2-2. Removing Fin Guard for Heat Exchanger
2-3. Shield for Horizontal Exhaust Discharge
2-4. Installing the Outdoor Unit in Heavy Snow
Areas
2-5. Precautions When Installing in Heavy Snow
Areas
2-6. Dimensions of Wind Ducting
2-7. Dimensions of Snow Ducting
5. HOW TO PROCESS TUBING .............................. 32
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 ...................................................... 36
■ Air Purging with a Vacuum Pump (for Test Run)
Preparation
7. TEST RUN ............................................................ 39
7-1. Preparing for Test Run
7-2. Test Run Procedure
7-3. Main Outdoor Unit PCB Setting
7-4. Auto Address Setting
7-5. Remote Controller Test Run Settings
7-6. Caution for Pump Down
7-7. Meaning of Alarm Messages
3. HOW TO INSTALL THE OUTDOOR UNIT .............. 24
3-1. Transporting
3-2. Installing the Outdoor Unit
3-3. Remove the Brackets Used for Transport
3-4. Routing the Tubing
3-5. Prepare the Tubing
3-6. Connect the Tubing
4. ELECTRICAL WIRING ......................................... 28
4-1. General Precautions on Wiring
4-2. Recommended Wire Length and Wire
Diameter for Power Supply System
4-3. Wiring System Diagram
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Page 7
1. GENERAL
CAUTION
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.
Check local electrical codes and
regulations before obtaining
wire. Also, check any specifi ed
instructions or limitations.
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
Table 1-1 Outdoor Unit
Q’ty
Part name Figure
U-72MF1U9
U-72MF1U9E
(6 ton)
Connection tubing
Instruction manual
Outer
diameter
ø1-1/8"(ø28.58)
Outer
diameter
ø7/8"(ø22.22)
Outer
diameter
ø3/4"(ø19.05)
Inner
diameter
ø3/4"(ø19.05)
Inner
diameter
ø3/4"(ø19.05)
Inner
diameter
ø5/8"(ø15.88)
paper
01
11
01
11
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U-96MF1U9
U-96MF1U9E
(8 ton)
Page 8
1-5. Tubing Length
Select the installation location so that the length and size of refrigerant tubing are within the allowable range shown in
the fi gure below.
1. Main tubing length LM = LA + LB … b 262 ft
2. Main distribution tubes LC – LH are selected according to the capacity after the
3. The outdoor connection main tubing (LO portion) is determined by the total capacity of the
outdoor units that are connected to the tube ends.
4. Sizes of indoor unit connection tubing
distribution joint.
1 – 40 are determined by the connection
tubing sizes on the indoor units.
L5
H3
C
LM
Balance tubing
3/8"
)
(ø
Explanation of symbols
Distribution joint
(purchased separately)
Ball valve (field supply)
T-joint (field supply)
Solidly welded shut
(pinch weld)
Note: Do not use commercially available T-joints for the liquid tubing
* Be sure to use special R410A distribution joints (CZ: purchased separately) for outdoor
unit connections and tubing branches.
LO
AB
LA
LF
LB LC
Max.
1.3 ft
1.3 ft
Max.
LG
L4
For
extension
For
extension
LD
4
LH
1
L1
L2
LE L3
5
2
and parts.
T-joint tubing
(header joint system)
6
3
7
Solenoid valve kit
R410A distribution joint
CZ-P900PH1U (for outdoor unit)
CZ-P224BH1U (for indoor unit)
CZ-P680BH1U (for indoor unit)
CZ-P1350BH1U (for indoor unit)
40
H1
H2
Table 1-2 Ranges that Apply to Refrigerant Tubing Lengths and to Differences in Installation Heights
Item Mark Contents Length (ft.)
Allowable
tubinglength
Allowable
elevationdifference
Allowable length of
joint tubing
L = Length, H = Height
L1 Max. tubing length
ΔL (L2 – L4)
Difference between max. length and min. length from
the No. 1 distribution joint
LM Max. length of main tubing (at max. diameter)
1, 2... 40
1+ 2... 40+
L1+
A+ B+LF+LG+LH
Max. length of each distribution tube
Total max. tubing length including length of each
distribution tube (only liquid tubing)
L5 Distance between outdoor units
H1 When outdoor unit is installed higher than indoor unit
When outdoor unit is installed lower than indoor unit
H2 Max. difference between indoor units
H3 Max. difference between outdoor units
L3
T-joint tubing (fi eld-supply); Max. tubing length between
the fi rst T-joint and solidly welded-shut end point
Actual length
Equivalent length
≤ 492
≤ 574
≤ 131
≤ 262*²
≤ 98
≤ 984
≤ 32
≤ 164
≤ 131
≤ 49
≤ 13
≤ 6.6
NOTE
1: The outdoor connection main tubing (LO portion) is determined by the total capacity of the outdoor units that are
connected to the tube ends.
2: If the longest tubing length (L1) exceeds 295 ft. (equivalent length), increase the sizes of the main tubes (LM) by 1
rank for the discharge tubes, suction tubes, and narrow tubes. (fi eld supplied)
3: If the longest main tube length (LM) exceeds 164 feet, increase the main tube size at the portion before 164 ft. by 1
rank for the suction tubes and discharge tubes. (fi eld supplied)
(For the portion that exceeds 164 feet, set based on the main tube sizes (LA) listed in the table on the following page.)
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Page 9
1-6. Tubing Size
Table 1-3 Main Tubing Size (LA)
BTU/h (kW)
Total system tonnage 6 8 12 14 16 18 20 22 24
Combined outdoor models
Suction tubing
Discharge tubing
Liquid tubing
72,000
(21.1)
U-72MF1U9(E) U-96MF1U9(E) U-72MF1U9(E)
ø3/4"
(ø19.05)
ø5/8"
(ø15.88)
*1: If future extension is planned, select the tubing diameter based on the total tonnage after extension.
However extension is not possible if the resulting tubing size is two ranks higher.
*2: The balance tube (outdoor unit tube) diameter is ø3/8" (ø9.52).
*3: Type 1 tubing should be used for the refrigerant tubes.
*4: If the length of the longest tube (L1) exceeds 295 ft. (equivalent length), increase the main tube (LM) size by 1 rank for the
suction, discharge, and liquid tubes. (Use field-supply reducers.) (Select from Table 1-3 and Table 1-9.)
*5: If the longest main tube length (LM) exceeds 164 ft., increase the main tube size at the portion before 164 ft. by 1 rank for the
suction tubes and discharge tubes.
(For the portion that exceeds 164 ft., set based on the main tube sizes (LA) listed in the table above.)
ø3/8"
(ø9.52)
96,000
(28.1)
ø7/8"
(ø22.22)
ø3/4"
(ø19.05)
139,000
(40.7)
U-72MF1U9(E)
ø1/2"
(ø12.7)
168,000
(49.2)
U-96MF1U9(E)
U-72MF1U9(E)
ø1-1/8"
(ø28.58)
ø7/8"
(ø22.22)
192,000
(56.3)
U-96MF1U9(E)
U-96MF1U9(E)
ø5/8"
(ø15.88)
203,000
(59.5)
U-72MF1U9(E)
U-72MF1U9(E)
U-72MF1U9(E)
240,000
(70.3)
U-96MF1U9(E)
U-72MF1U9(E)
U-72MF1U9(E)
ø1-1/8"
(ø28.58)
264,000
(77.4)
U-96MF1U9(E)
U-96MF1U9(E)
U-72MF1U9(E)
ø1-3/8"
(ø34.92)
ø3/4"
(ø19.05)
Unit: in. (mm)
288,000
(84.4)
U-96MF1U9(E)
U-96MF1U9(E)
U-96MF1U9(E)
■ Size of tubing (LO) between outdoor units
Select the size of tubing between outdoor units based on the main tubing size (LA) as given in the table above.
Table 1-4 Main Tubing Size After Distribution (LB, LC...)
Total capacity
after distribution
Tubing size
Below BTU/h 24.200 54.600 85.300 102.400 124.200 143.300 162.400 200.600 238.900
Over BTU/h – 24.200 54.600 85.300 102.400 124.200 143.300 162.400 200.600
Suction tubing
Discharge tubing
Liquid tubing
ø5/8"
(ø15.88)
ø1/2"
(ø12.70)
ø3/8"
(ø9.52)
ø3/4"
(ø19.05)
ø5/8"
(ø15.88)
ø3/8"
(ø9.52)
ø3/4"
(ø19.05)
ø5/8"
(ø15.88)
ø3/8"
(ø9.52)
ø7/8"
(ø22.22)
ø3/4"
(ø19.05)
ø3/8"
(ø9.52)
ø1-1/8"
(ø28.58)
ø3/4"
(ø19.05)
ø1/2"
(ø12.70)
ø1-1/8"
(ø28.58)
ø7/8"
(ø22.22)
ø1/2"
(ø12.70)
ø1-1/8"
(ø28.58)
ø7/8"
(ø22.22)
ø1/2"
(ø12.70)
ø1-1/8"
(ø28.58)
ø7/8"
(ø22.22)
ø5/8"
(ø15.88)
Unit: in. (mm)
ø1-1/8"
(ø28.58)
ø1-1/8"
(ø28.58)
ø5/8"
(ø15.88)
Total capacity
after distribution
Tubing size
Below BTU/h 258.000 334.400 –
Over BTU/h 238.900 258.000 334.400
Suction tubing
Discharge tubing
Liquid tubing
ø1-3/8"
(ø34.92)
ø1-1/8"
(ø28.58)
ø3/4"
(ø19.05)
ø1-3/8"
(ø34.92)
ø1-1/8"
(ø28.58)
ø3/4"
(ø19.05)
ø1-1/2"
(ø38.10)
ø1-1/8"
(ø28.58)
ø3/4"
(ø19.05)
Table 1-5 Outdoor Unit Tubing Connection Size (A – D)
BTU/h
(kW)
Suction tubing
Discharge
tubing
Liquid tubing
Balance tubing
72,000
(21.1)
ø3/4"*¹
(ø19.05)*¹
Brazing connection
ø5/8"
(ø15.88)
Brazing connection
ø3/8" (ø9.52) ø3/8" (ø9.52)
Flare connection
ø3/8" (ø9.52)
Flare connection
96,000
(28.1)
ø7/8"*²
(ø22.22)*²
ø3/4"
(ø19.05)
Unit: in. (mm)
*1: The outdoor unit connection tubing (LO) is
determined by the total capacity of the outdoor
units connected to the tube ends. The tubing
size is selected based on the table of main
tube sizes after the branch.
*2: If the total capacity of the indoor units
connected to the tube ends is different from
the total capacity of the outdoor units, then the
main tube size is selected based on the total
capacity of the outdoor units.
(For LA, LB, and LF in particular)
*1 If the size of tubing (LA) is less than 16.4 feet,
it is recommended that the tubing diameter be
larger than ø7/8" (ø22.22).
*2 If the size of tubing (LA) is less than 16.4 feet,
it is recommended that the tubing diameter be
larger than ø1-1/8" (ø28.58).
9
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Page 10
Table 1-6 Refrigerant Charge Amount at Shipment (for outdoor unit)
DC
(oz)
U-72MF1U9
U-72MF1U9E
416 416
Table 1-7 Indoor Unit Tubing Connection Size ( 1 – 40)
Indoor unit type 7 9 12 15 18 19 24 36 48 54
Distribution
joint-solenoid
valve kit tubing
Solenoid valve
kit-Indoor unit
tubing
connection
*1: For the solenoid valve kits, use type 160 with parallel specifi cations. Branch the tubing before and after the solenoid valve kits.
Suction tubing ø5/8" (ø15.88)
Discharge tubing ø1/2" (ø12.7)
Liquid tubing ø3/8" (ø9.52)
Gas tubing ø1/2" (ø12.7) ø5/8" (ø15.88)
Liquid tubing ø1/4" (ø6.35) ø3/8" (ø9.52)
U-96MF1U9
U-96MF1U9E
Unit: in. (mm)
1-7. Straight Equivalent Length of Joints
Design the tubing system by referring to the following table for the straight equivalent length of joints.
Table 1-8 Straight Equivalent Length of Joints
Gas tubing size (in.(mm))
90° elbow
45° elbow
U-shape tube bent
(R2–23/64–3–15/16 in.)
Trap bend
1/2"
(12.7)
1 ft.
(0.30 m)
0.8 ft.
(0.23 m)
3 ft.
(0.90 m)
7.5 ft.
(2.30 m)
5/8"
(15.88)
1.1 ft.
(0.35 m)
0.9 ft.
(0.26 m)
3.4 ft.
(1.05 m)
9.2 ft.
(2.80 m)
3/4"
(19.05)
1.4 ft.
(0.42 m)
1 ft.
(0.32 m)
4.1 ft.
(1.26 m)
10.5 ft.
(3.20 m)
7/8"
(22.22)
1.6 ft.
(0.48 m)
1.2 ft.
(0.36 m)
4.7 ft.
(1.44 m)
12.5 ft.
(3.80 m)
1"
(25.4)
1.7 ft.
(0.52 m)
1.3 ft.
(0.39 m)
5.1 ft.
(1.56 m)
14.1 ft.
(4.30 m)
1-1/8"
(28.58)
1.9 ft.
(0.57 m)
1.4 ft.
(0.43 m)
5.6 ft.
(1.71 m)
15.4 ft.
(4.70 m)
1-1/4"
(31.8)
2.3 ft.
(0.70m)
1.7 ft.
(0.53 m)
6.9 ft.
(2.10 m)
16.4 ft.
(5.00 m)
1-1/2"
(38.1)
2.6 ft.
(0.79 m)
1.9 ft.
(0.59 m)
7.8 ft.
(2.37 m)
14.0 ft.
(5.80 m)
Y-branch distribution joint
Ball valve for service Equivalent length conversion not needed.
Table 1-9 Refrigerant tubing (Existing tubing can be used.)
Tubing size (in. (mm))
Material O Material 1/2H • H
ø1/4" (ø6.35) t1/32 (t0.8)
ø3/8" (ø9.52) t1/32 (t0.8) ø1-1/8" (ø28.58) t5/128 (t1.0)
ø1/2" (ø12.7) t1/32 (t0.8) ø1-1/4" (ø31.75) t3/64 (t1.1)
Equivalent length conversion not needed.
* When bending the tubes, use a bending
radius that is at least 4 times the outer
diameter of the tubes.
In addition, take sufficient care to avoid
crushing or damaging the tubes when
bending them.
ø5/8" (ø15.88) t5/128 (t1.0) ø1-1/2" (ø38.10) over t3/64 (t1.15)
ø3/4" (ø19.05) over t5/128 (t1.0) ø1-5/8" (ø41.28) over t3/64 (t1.20)
ø7/8" (ø22.22) t5/128 (t1.0)
1-8. Additional Refrigerant Charge
Additional refrigerant charge amount is calculated from the liquid tubing total length and a type of outdoor unit as
follows.
Required amount of additional refrigerant charge =
Table 1-10-1 Amount of Refrigerant Charge Per ft.,
According to Liquid Tubing Size
Liquid tubing
size
Amount of
refrigerant
charge (oz/ft.)
ø1/4"
(ø6.35)
ø3/ 8"
(ø9.52)
ø1/2"
(ø12.7)
ø5/8"
(ø15.88)
ø3/4"
(ø19.05)
ø7/ 8"
(ø22.22)
0. 279 0.602 1. 38 1.9 9 2.78 3.9 3
[ (Amount of additional refrigerant charge per ft. of
each size of liquid tube × its tube length) + (...) + (...)]
+ [(Necessary amount of additional refrigerant charge
per outdoor unit + (...) + (...)]
* Always charge accurately using a scale for weighing.
10
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Page 11
Table 1-10-2 Necessary Amount of Refrigerant Charge Per Outdoor Unit
Outdoor unit Outdoor unit Indoor unit
Suction tube
Discharge tube
Liquid tube
Balance tube
Suction tube
Discharge tube
Liquid tube
Gas tube
Liquid
tube
4-tube layout 3-tube layout 2-tube layout
Solenoid
valve kit
Indoor unit
Room
Hallway
Indoor unit
Room
Indoor unit
Room
Hallway
Indoor unit
Room
Solenoid
valve kit
Solenoid
valve kit
Further charge a certain amount listed below in addition to the amount of refrigerant charge.
U-72MF1U9
U-72MF1U9E
42 oz/unit 42 oz/unit
U-96MF1U9
U-96MF1U9E
1-9. System Limitations
Table 1-11 System Limitations
Max. No. allowable connected outdoor units 3
Max. capacity allowable connected outdoor units
288,000 BTU/h (24 ton, 84.4 kw)
Max. connectable indoor units 40*¹
Max. allowable indoor/outdoor capacity ratio 50 – 130 %
*1: In the case of 16 ton (type 192,000 BTU/h) or smaller units, the number is limited by the total capacity of the connected indoor
units.
1-10. Installation Standards
Relationship between A/C units and refrigerant tubing
● Install the solenoid valve kit 98 ft. or less from the indoor unit.
● In quiet locations such as hospitals, libraries, and hotel rooms, the refrigerant noise may be somewhat noticeable. It
is recommended that the solenoid valve kit be installed inside the corridor ceiling, at a location outside the room.
Desirable Undesirable
Common solenoid valve kit
Multiple indoor units under group control can utilize a solenoid valve kit in common.
●
Categories of connected indoor unit capacities are determined by the solenoid valve kit.
●
Type of solenoid valve kit Total capacity of indoor units (BTU/h)
160 19.000 < Total capacity < 54.600
56 7.500 < Total capacity < 19.000
If the capacity range is exceeded, use 2 solenoid valves connected in parallel.
●
11
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Page 12
15 to 30
B
A
B
A
Tube branching methods (horizontal use)
Arrow view
Horizontal
line
View as seen
from arrow
WARNING
Always check the gas density
CAUTION
limit for the room in which the
unit is installed.
1-11. 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.
1-12. Installing Distribution Joint
Pay special attention to any
location, such as a basement,
etc., where leaking refrigerant can
accumulate, since refrigerant gas
is heavier than air.
(1) Refer to “HOW TO ATTACH DISTRIBUTION JOINT”
enclosed with the optional distribution joint kit
(CZ-P900PH1U, CZ-P224BH1U, CZ-P680BH1U,
CZ-P1350BH1U).
(2) When creating a branch using a commercially available
T-joint (header joint system), orient the main tubing
so that it is either horizontal (level) or vertical. 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.
[Header joint system]
Be sure to solidly weld shut the T-joint end (marked
●
by “X” in the figure). In addition, pay attention to the
insertion depth of each connected tube so that the
flow of refrigerant within the T-joint is not impeded.
When using the header joint system, do not make
●
further branches in the tubing.
Header joint system (Indoor)
Outdoor
Indoor
Horizontal
line
L3 6.56 ft.
Types of vertical trap specifications
(When using ball valve)
Main tubing
Ball valve
(BV: purchased
separately)
Indoor unit (1)
(When not using ball valve)
Main tubing
Indoor unit is directed downward
Indoor unit (more than 2 units)
(If only 1 unit is connected, a ball
valve is also needed on this side.)
Branch tubing is
directed upward.
More than
7–7/8"
Install at a
positive angle
Indoor
Indoor
Horizontal
line
Horizontal
Indoor unit
Install at a
positive angle
(15 – 30°)
Solidly welded
shut (X)
(Each unit is connected
to tubing that is either
level or is directed
downward.)
Do not use the header joint system on the outdoor unit
●
side.
(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.)
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12
Page 13
1-13. Optional Distribution Joint Kits
See the installation instructions packaged with the distribution joint kit for the installation procedure.
Table 1-12
Model name Cooling capacity after distribution Remarks
1. CZ-P900PH1U 307.100 BTU/h or less For outdoor unit
2. CZ-P224BH1U 76.400 BTU/h or less For indoor unit
3. CZ-P680BH1U 232.000 BTU/h or less For indoor unit
4. CZ-P1350BH1U 460.700 BTU/h or less For indoor unit
■ Tubing size (with thermal insulation)
1. CZ-P900PH1U
For outdoor unit (Capacity after distribution joint is 307.100 BTU/h or less.)
Note that the dimension marked with every alphabetical letter in the diagram shows the inner diameter.
Suction Tube
B
Distribution
Joint
11-13/16 11-13/16
C
#C
#C
D
E
D
C
E
DE
Insulation
*Insulators for both the Suction tube and the Discharge tube are the same.
C
Discharge Tube
#C
#C
D
E
F
Liquid Tube
G
F
EDF
C
F
G
H
I
E
E
13-25/64
EFG
HI
InsulationInsulation
Unit: in.
*Suction tube and Discharge tube are similar in sizes and both the tube entrances have the same diameter. So the both
Distribution joints can fit into different tubes. Since the diameter of the tube ends for both Suction and Discharge tube are
different, take care not to connect the distribution joint different. See the “ # ” marks on the above figures.
Table 1-13 Dimensions for connections of each part
Size Part B Part C Part D Part E Part F Part G Part H Part I
Inch ø1-1/4 ø1-1/8 ø1 ø7/8 ø3/4 ø5/8 ø1/2 ø3/8
13
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Page 14
Table 1-14 Dimensions for connections of each part
HG
G
Insulation
Insulation
Insulation
*Insulators for both the Suction tube and the Discharge tube are the same.
*Suction tube and Discharge tube are similar in sizes and both the tube entrances have the same diameter. So the both
Distribution joints can fit into different tubes. Since the diameter of the tube ends for both Suction and Discharge tube are
different, take care not to connect the distribution joint different. See the “ # ” marks on the above figures.
Note that the dimension marked with every alphabetical letter in the diagram shows the inner diameter.
I
H
IH
I
H
EFD
D
C
C
#C
#D
#D
#C
EF
GF E
EFG
E
F
G
E
F
D
E
F
FED
FE
H
G
G
Suction Tube
Discharge Tube
Liquid Tube
11-13/16
13-25/64
11-13/16
Position A B C D E F G H I J
Dimension ø1-1/2" ø1-1/4" ø1-1/8" ø1" ø7/8" ø3/4" ø5/8" ø1/2" ø3/8" –
2. CZ-P224BH1U
Use: For indoor unit (Capacity after distribution joint is 76.400 BTU/h or less.)
Example: (F below indicates inner diameter. below indicates outer diameter.)
F
Unit: in.
Liquid tubing
9–1/4
I
H
HIIH
2–23/32
2–11/64
F
G
F
Suction tubing
8–17/64
F
F
F
G
H
5–45/64
F
GH
2–11/64
3–5/8 15/32
1–37/64
Discharge tubing
7–21/64
H
G
5–23/64
H
G
HH
H
H
G
3–1/32 9/32
Thermal insulation
Thermal insulation
Thermal insulation
3. CZ-P680BH1U
Use: For indoor unit (Capacity after distribution joint is greater than 76.400 BTU/h and no more than 232.000 BTU/h.)
Unit: in.
4. CZ-P1350BH1U
Use: For indoor unit (Capacity after distribution joint is greater than 232.000 BTU/h and no more than 460.700 BTU/h.)
Example: (B below indicates inner diameter. below indicates outer diameter.)
3UCTIONTUBINGs$ISCHARGETUBING
H
G
2–11/64
Thermal insulation
F
BB
3–35/64
F
E
$
C
C
A
B
B
BBC
4–9/64 4–13/32
1–49/64
C
W-3WAYECO-iU.indb14W-3WAYECO-iU.indb14 2011/11/0716:29:312011/11/0716:29:31
B
Liquid tubing
I
H
G
G
F
G
E
G
F
I
H
EC $AFFA$ CE
E
13–25/64
G
E
F
Thermal insulation
14
G
Unit: in.
5–1/8
HI
1–31/32
Unit: in.
Page 15
1-14. Optional Solenoid Valve Kit
Precautions on Installation of Solenoid Valve Kit
(1) Clean base metals thoroughly.
(2) Use proper ventilation to carry fumes away from the work area.
(3) Use a high quality silver based solder of at least 15 % silver.
(4) Heat the base materials broadly and uniformly.
(5) Take precautions not to overheat the device which could damage sensitive internal components.
(6) Insure compliance with all local codes!
Part
Number
1
2
3
4
5
6
7
8
9
0
!
@
#
$
1-21/32
3-21/32
CZ-P56HR1U
Types and specifi cations of
tubing connections
Gas tube: ID1/2"
Liquid tube: ID1/4"
Suspension hook
Liquid tube: ID3/8"
Suction tube: ID5/8"
Discharge tube: ID1/2"
Service panel
Base of control box
Terminal for power line
Terminal for communication line
Earth (M5 with washer)
Cover of control box
Relay kit
Cover of relay kit
5-25/32
1-21/32
3-21/32
4-7/32
• Specifications
CZ-P56HR1U
Compatibility
7.500 ≤ Total capacity of indoor units (BTU/h) < 19.000
Power source Single-phase AC 208–230V 60Hz (supplied by indoor unit)
Power input 33 W max.
Net weight 151.7 oz.
Accessories Washer x 2
Hanging hook
M4 screw x 4
Tapping screw x 4
Wire holder
3-WAY connect wire
ACC-3WAY-AAB (Solenoid Valve Relay Kit)
1
3
6
63/64
4
5
2-31/64
3-15/16
6-29/64
8-15/32
63/64
2-31/64
3-15/16
9-13/32
7
53/64 2-63/64
2
5-55/64
4-21/64 4-21/64
9
11
8
5-3/64
4-1/4
3-25/32
12
5-55/64
9-29/64
7/16
43/64
1-7/64
5-55/64
2-3/64
5-9/32
4-49/64
Unit: in.
1314
10
15
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Page 16
CZ-P160HR1U
• Specifications
Part
Number
1
2
3
4
5
6
7
8
9
0
!
@
#
$
1-21/32
3-21/32
Types and specifi cations of
tubing connections
Gas tube: ID5/8"
Liquid tube: ID3/8"
Suspension hook
Liquid tube: ID3/8"
Suction tube: ID5/8"
Discharge tube: ID1/2"
Service panel
Base of control box
Terminal for power line
Terminal for communication line
Earth (M5 with washer)
Cover of control box
Relay kit
Cover of relay kit
5-25/32
4-7/32
7
1
1-21/32
3-21/32
CZ-P160HR1U
Compatibility
19.000 ≤ Total capacity of indoor units (BTU/h) < 54.600
Power source Single-phase AC 208–230V 60Hz (supplied by indoor unit)
Power input 40 W max.
Net weight 165.8 oz.
Accessories Washer x 2
Hanging hook
M4 screw x 4
Tapping screw x 4
Wire holder
3-WAY connect wire
ACC-3WAY-AAB (Solenoid Valve Relay Kit)
3
6
63/64
4
5
2-31/64
3-15/16
6-29/64
8-15/32
63/64
2-31/64
3-15/16
9-13/32
53/64 2-63/64
1314
5-3/64
4-1/4
3-25/32
12
2
5-55/64 5-55/64
9
11
10
4-21/64 4-21/64
8
9-29/64
7/16
43/64
1-7/64
5-55/64
2-3/64
5-9/32
4-49/64
Unit: in.
10
16
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Page 17
Suspension bolt (3/8" or M10) (field supplied)
Nut (field supplied) (3/8" or M10)
Washer
M4 screws
(12 pcs.)
Suspension hook
Installation of Solenoid Valve Kit
1. Install the relay kit into the indoor unit.
Refer to the Installation Manual for the solenoid valve kit.
2. Connect the solenoid valve kit and the relay kit in the field.
Gas tube
Liquid tube
Connect with
conduit for
power supply
Suspension hook
Top surface
Discharge tube
Relay kit
Front
Liquid tube
Suction tube
Cover of control box
NOTE
Notes on Installation
• Be sure to secure the valve body by using its structure with the suspension bolt, etc.
• Install the valve body within a distance of 98 ft. from the indoor unit.
Some refrigerant noise will be produced. Therefore in hospitals, libraries, hotel guest rooms, and other quiet
locations, it is recommended that the solenoid valve kit be installed on the ceiling reverse side of a hallway or
another location separated from the room.
• When installing the valve body, install with the top surface facing up. Secure 7-7/8" or more of space to the front
so that the front service panel can be removed.
• If the supplied suspension hook will not be used, and other fastening devices will be attached in the field, use
the 4 screw holes on the top surface. DO NOT use any long screws other than the supplied screws. Use of other
screws may puncture the internal tubing, resulting in refrigerant leakage.
• Do not block the air holes.
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Front
Service space
7-7/8" or more
17
Page 18
1-15. Example of Tubing Size Selection and Refrigerant Charge Amount
CAUTION
Additional refrigerant charging
Based on the values in Tables 1-3, 4, 5, 9 and 10-2 use the liquid tubing size and length, and calculate the amount of additional
refrigerant charge using the formula below.
Required additional
refrigerant charge (oz)
(a) : Liquid tubing Total length of ø7/8" (ft.) (d) : Liquid tubing Total length of ø1/2" (ft.)
(b) : Liquid tubing Total length of ø3/4" (ft.) (e) : Liquid tubing Total length of ø3/8" (ft.)
(c) : Liquid tubing Total length of ø5/8" (ft.) (f ) : 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.
However if only one outdoor unit is installed, a balance tube is not used. Therefore, leave the valves fully closed.)
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.
3.93 × (a) + 2.78 × (b) + 1.99 × (c) + 1.38 × (d) + 0.602 × (e) + 0.279 × (f) + Necessary amount of
=
additional refrigerant charge per outdoor unit
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.
Balance tube
Use a flathead screwdriver
and open by turning the part
with the screw groove to the
right, from “ ” to “ ”
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
B
for R410A.
A
Example:
Outdoor unit
96 type 96 type
● Example of each tubing length
LB
LA
1 2 3 4
48 type 48 type 48 type 36 type
LC
Liquid tube
Use a hex wrench (width 5/32 inch)
and turn to the left to open.
Discharge tube
Use a flathead screwdriver
and open by turning the part
with the screw groove to the
right, from “ ” to “ ”
Main tubing Distribution joint tubing
LA = 131 ft. Outdoor side Indoor side
LB = 16 ft.
LC = 16 ft.
A = 7 ft. 1 = 98 ft.
B = 7 ft. 2 = 16 ft.
3 = 16 ft.
4 = 65 ft.
Suction tube
Use a flathead screwdriver
and open by turning the part
with the screw groove to the
right, from “ ” to “ ”
18
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● Obtain liquid tubing size from Tables 1-3, 4, 5 and 9.
CAUTION
Main tubing
LA = ø5/8 (ft.) (Total capacity of indoor unit is 179,400 BTU/h) The longest tubing length in this example
LB = ø1/2 (ft.) (Total capacity of indoor unit is 131,600 BTU/h) (LA = 131 ft.)
LC = ø3/8 (ft.) (Total capacity of indoor unit is 83,800 BTU/h)
Distribution joint tubing
Outdoor side
Indoor side
A: ø3/8 (ft.) B: ø3/8 (ft.) (from outdoor unit connection tubing)
1: ø3/8 (ft.) 2: ø3/8 (ft.) 3: ø3/8 (ft.) 4: ø3/8 (ft.) (from indoor unit connection tubing)
● Obtain charge amount for each tubing size
Note1: The charge amounts per 1 ft. are different for each liquid tubing size.
ø5/8 (ft.) → LA : 131 ft. × 1.99 oz/ft. = 261 oz
ø1/2 (ft.) → LB : 16 ft. × 1.38 oz/ft. = 22 oz
ø3/8 (ft.) → LC +
A – B + 1 – 4 : 225 ft. × 0.602 oz/ft. = 135 oz
Total 418 oz
Additional refrigerant charge amount is 418 oz.
Note 2: Necessary amount of additional refrigerant charge per outdoor unit (U-96MF1U9) is 42 oz. (See the Table 1-10-2.)
Note 1) Amount of additional charge per tubing length : 418 oz
Note 2) Amount of additional charge for outdoor unit : 84 oz (42+42)
Total of additional refrigerant charge amount : 502 oz
Therefore, the total of additional refrigerant charge amount reaches 502 oz.
● Obtain overall refrigerant charge amount.
Overall refrigerant charge amount of the system indicates the calculated value shown above the addition al charge amount in
addition to the total of the refrigerant charge amount (shown in the Table 1-6) at the shipment of each outdoor unit.
Refrigerant charge amount at shipment:
U-96MF1U9 : 416 oz
U-96MF1U9 : 416 oz
Additional charge amount : 502 oz
Grand total : 1334 oz
Therefore, overall refrigerant charge amount of the system reaches 1334 oz.
Remark:
Be sure to include the values in Table 1-10-2 Necessary Amount of Refrigerant Charge Per Outdoor Unit.
Be sure to check the limit density for
the room in which the indoor unit is
installed.
19
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Page 20
2. SELECTING THE INSTALLATION SITE
CAUTION
More than
2 in.
More than
1.7 ft.
* More than 4 in.
* More than 4 in.
* More than 4 in.
Example of installation of 2 units
(When wall height is below 6 ft.)
* However, be sure to ensure a space of 1 ft. or more at
either the right side or the rear of the unit.
Exhaust fan
2-1. Outdoor Unit
AVOID:
● heat sources, exhaust fans, etc.
● damp, humid or uneven locations
● indoors (no-ventilation location)
DO:
● choose a place as cool as possible.
● choose a place that is well ventilated.
● allow enough room around the unit for air intake/
exhaust and possible maintenance.
● use lug bolts or equal to bolt down unit, reducing vibration
and noise.
Installation Space
Install the outdoor unit where there is enough space for
ventilation. Otherwise the unit may not operate properly. Fig.
2-2 shows the minimum space requirement around the outdoor
units when 3 sides are open and only 1 side is shuttered,
with open space above the unit. The mounting base should
be concrete or a similar material that allows for adequate
drainage. Make provisions for anchor bolts, platform height,
and other site-specific installation requirements.
● Leave space open above the
unit.
● Construct louvers or
other openings in the wall,
if necessary, to ensure
adequate ventilation.
(Ceiling panel dimensions)
Hot air
Outdoor
unit
Fig. 2-1
Fig. 2-2
113 (Ceiling panel dimensions)
4435
(Ceiling panel dimensions)
35
Heat
source
(Ceiling panel dimensions)
35
NOTE
● Do not do any wiring or tubing within 1 ft. of the front
panel, because this space is needed as a servicing
space for the compressor.
● Ensure a base height of 4 in. or more to ensure that
drainage water does not accumulate and freeze
around the bottom of the unit.
● If installing a drain pan, install the drain pan prior to
installing the outdoor unit.
* Make sure there is at least 6 in. between the outdoor
unit and the ground.
Also, the direction of the tubing and electrical wiring
should be from the front of the outdoor unit.
31-1/8
(Installation hole pitch)
20
7-7/8
31-1/8
(Installation hole pitch)
109-1/16 (Installation hole pitch)
Top view
Fig. 2-3
7-7/8
(Installation hole pitch)
31-1/8
35(Ceiling panel dimensions)
36-1/4 (Installation hole pitch)
37-1/2 (Maximum dimensions)
Unit: in.
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2-2. Removing Fin Guard for Heat Exchanger
CAUTION
After installation of the outdoor unit, detach the fin guard for
heat exchangers as following steps.
1. Cut out the fin guard entirely attached to the panel and
remove it from the outdoor unit. Pay careful attention not
to damage the fin when cutting out the fin guard.
2. If there is a case where easy to touch the sharp
aluminum fin of the outdoor unit, be sure to attach a
snow-proof ducting to the unit. It is recommended that
the outdoor unit be located away from the touched with
hands.
2-3. Shield for Horizontal Exhaust Discharge
It is necessary to install an air-discharge chamber (field
supply) to direct exhaust from the fan horizontally if it is
difficult to provide a minimum space of 7 ft. between the
air-discharge outlet and a nearby obstacle. (Fig. 2-4)
In regions with heavy snowfall,
the outdoor unit should be
provided with a solid, raised
platform and snow-proof
ducting (field supply). (Fig. 2-5)
Fig. 2-4
DO
2-4. Installing the Outdoor Unit in Heavy Snow
Areas
In locations where wind-blown snow can be a problem, snow-
proof ducting (field supply) should be fitted to the unit and
direct exposure to the wind should be avoided as much as
possible. (Fig. 2-6) The following problems may occur if proper
countermeasures are not taken:
● The fan in the outdoor unit may stop running, causing the
unit to be damaged.
● There may be no air flow.
● The tubing may freeze and burst.
● The condenser pressure may drop because of strong wind,
and the indoor unit may freeze.
2-5. Precautions When Installing in Heavy Snow
Areas
a) The platform should be higher than the maximum snow
depth. (Fig. 2-5)
b) 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 the outdoor unit.
c) The platform foundation must be solid and the unit must
be secured with anchor bolts.
d) When installing on a roof subject to strong wind,
countermeasures must be taken to prevent the unit from
being overturned.
AVOID
Without snowproof ducting
(Without platform)
Fig. 2-5
Fig. 2-6
Fallen snow
With snowproof ducting
(High platform)
21
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2-6. Dimensions of Wind Ducting
Reference diagram for air-discharge chamber (field supply)
unit: in.
33-3/16
35
(Ceiling panel dimensions)
35-1/4
(Maximum bracket dimensions)
Front view Front viewRight side view Right side view
3-unit installation
(2-unit installation: maximum dimensions)
(Installation hole pitch)
Ceiling panel
Air direction: Front direction Air direction: Right direction
35
(Ceiling panel dimensions)
21
(32-1/8)
106-1/8
74-1/16
Note: Can be installed so that the air direction is to the front, right, left or rear direction.
(3-unit installation: maximum dimensions)
113
74-1/4
33-3/16 33-3/16 33-3/16
31-1/8
5-3/4
31-1/8
(Installation hole pitch)
5-3/4
31-1/8
(Installation hole pitch)
Top view
33-1/4
35
(Ceiling panel dimensions)
1
2
35
(32-1/8)
74-1/16
Ceiling panel
35-1/4
(Ceiling panel dimensions)
(Maximum bracket dimensions)
106-1/8
unit: in.
36-1/4
7-7/8 7-7/8
Front view Right side view
22
(Installation hole pitch)
(32-1/8)
106-1/8
74-1/16
35
(Ceiling panel dimensions)
21
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2-7. Dimensions of Snow Ducting
Reference diagram for snow-proof ducting (field supply)
Air direction:
Front direction
31-1/2
Air direction:
Right direction
54
31-1/2
31-1/2
(Air intake duct)
33-3/16
9-1/2 9-1/2
53-5/8
(Air outlet duct)
35
(Ceiling panel dimensions)
(54)
44-3/8
1 pc.
4 pc.
Front view
Ceiling panel Ceiling panel
31-1/2
9-1/2
(32-1/8)
106-1/8
74-1/16
35
(Ceiling panel dimensions)
32-7/8
1
9-1/2 9-1/2 9-1/2
53-5/8
44-3/8
Right side view
Note: Can be installed so that the air direction is to the front, right, left or rear direction.
3-unit installation
35 35 35
113
44
31-1/2
54
35
(Ceiling panel dimensions)
32-7/8
1
Front view
31-1/2
(Air intake duct)
35
33-3/16
(54)
(Air outlet duct)
(Ceiling panel dimensions)
9-1/2 9-1/2
Right side view
unit: in.
Snowfall protection duct
(Field supply)
31-1/2
Air-discharge chamber
(Field supply)
Snowfall protection
duct (Field supply)
53-5/8
44-3/8
3
31-1/8
7-7/8 7-7/8
Board
(Field supply)
31-1/8 31-1/8
Board (Field supply)
Air-discharge chamber (Field supply)
131-3/4
Front view
35
37-3/8
36-1/4
Top view (Before installation of snowfall protection duct)
Snowfall protection duct
(Field supply)
31-1/2
35 (Ceiling panel dimensions)
Ceiling panel
Snowfall protection
duct (Field supply)
53-5/8
44-3/8
23
9-1/2 9-1/2
7/82-1/8
106-1/8
74
44-3/8
Right side view
unit: in.
Air-discharge chamber
(Field supply)
Snowfall protection duct
(Field supply)
53-5/8
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3. HOW TO INSTALL THE OUTDOOR UNIT
CAUTION
3-1. Transporting
When transporting the unit, have it delivered as close to the installation site as
possible without unpacking. Use a hook for suspending the unit. (Fig. 3-1)
● When hoisting the outdoor unit, pass ropes or straps under the bottom plate
as shown in the figure at right. When hoisting, the angle between the rope
and top panel must be 70° or greater so that the rope does not come into
contact with the fan guard.
(Use 2 lengths of rope 25 ft. long or longer.)
● When passing the ropes through the square holes of the bottom plate:
Place the rope in the outer edge of the square holes.
● Use protective panels or padding at all locations where the rope contacts the
outer casing or other parts to prevent scratching. In particular, use protective
material (such as cloth or cardboard) to prevent the edges of the top panel
from being scratched.
● Be careful of the fan.
There is danger of injury if the fan starts to turn during inspection. Be sure to
turn OFF the remote power switch before beginning inspection.
3-2. Installing the Outdoor Unit
(1) Use anchor bolts (M12 or 15/32") or similar to securely anchor the unit in
place. (Fig. 3-2)
(2) Be sure the rubber vibration insulator and platform extend to the inside of
the legs. In addition, the washers used to anchor the unit from the top must
be larger than the installation anchor holes. (Figs. 3-2 and 3-3)
(Positions where anchor bolts are fastened)
Installation anchor hole (4-19/32 25/32 oval holes)
Fig. 3-1
Plate leg
Anchor bolts
Washer
25/32
3-15/32
(3-15/16)
(3-15/16)
Vibration insulator
1-31/32
Base
Unit: in.
The vibration insulator, base, or platform must
be large enough to bear the full surface of the
base plate legs.
Fig. 3-2
31-1/8
(Installation hole pitch)
35
(Ceiling panel dimensions)
35
(Ceiling panel dimensions)
3
31-1/8
(Installation hole pitch)
35
113 (Ceiling panel dimensions)
(Ceiling panel dimensions)
109 (Installation hole pitch)
37-1/2
36-1/4
(Installation hole pitch)
(Ceiling panel dimensions)
(Installation hole pitch)
(Maximum dimensions)
35
31-1/8
Top view
Fig. 3-4
(Ceiling panel dimensions)
35
31-1/8
(Installation hole pitch)
24
unit: in.
4 – 19/32 25/32 hole
35
37-1/2
36-1/4
(Installation hole pitch)
(Ceiling panel dimensions)
(Maximum dimensions)
Surface where
installation anchor
brackets are
installed
1-31/32
(Detailed view of legs)
19/32
Unit: in.
1-33/64
Fig. 3-3
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Page 25
3-3. Remove the Brackets Used for Transport
● After installing the unit, remove the
2 transport brackets from the front
and rear (4 brackets total). (Fig. 3-5)
Remove the 2 screws
(8 screws total)
Remove the 2 transport brackets from
the front and rear (4 brackets total)
Fig. 3-5
3-4. Routing the Tubing
● The tubing can be routed out either from the front or from the bottom. (Fig. 3-6)
● The connecting valve is contained inside the unit. Therefore, remove the front panel. (Fig. 3-6)
(1) If the tubing is routed out from the front, use cutting pliers or a similar tool to cut out the tubing outlet slit (part
indicated by ) from the tubing cover. (Figs. 3-6 and 3-7)
Front
Bottom
Tubing cover
Remove 2 screws
Use cutting pliers or similar
tool to cut cover out
(2) If the tubing is routed out from the bottom, remove
the slit part ( ).
● Use a drill bit approximately 13/64" dia. to create
holes at the 4 slit hole indentations (openings).
● Punch out the slit part ( ).
● Be careful not to damage the base plate.
Remove 11 panel
screws from front
panel
Fig. 3-6
Indentation
(4 locations)
Slit hole
Fig. 3-7
25
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Page 26
3-5. Prepare the Tubing
CAUTION
● Material: Use C1220 phosphorous deoxidized copper as described in JIS H3300, “Copper and Copper Alloy
Seamless Pipes and Tubes.”
(For tubes that are ø1" (ø25.4 mm) or larger, use 1/2H material or H material. For all others use O material.)
● Tubing size
Use the tubing size indicated in the table below.
● When cutting the tubing, use a tube cutter, and be sure to remove any burrs.
(The same applies to distribution tubing (optional).)
● When bending the tubes, bend each tube using a radius that is at least 4 times the outer diameter of the tube.
When bending, use sufficient care to avoid crushing or damaging the tube.
● For flaring, use a flare tool, and be sure that flaring is performed correctly.
Use sufficient caution during preparation of the tubing. Seal the tube ends by
means of caps or taping to prevent dust, moisture, or other foreign substances
from entering the tubes.
Refrigerant tubing (Existing tubing can be used.)
Tubing size (mm)
Outer dia. Thickness Outer dia. Thickness
ø1/4" (ø6.35) t1/32" (t0.8) ø3/4" (ø19.05) over t5/128" (t1.0)
ø3/8" (ø9.52) t1/32" (t0.8) ø7/8" (ø22.22) t5/128" (t1.0)
ø1/2" (ø12.7) t1/32" (t0.8) ø1-1/8" (ø28.58) t5/128" (t1.0)
ø5/8" (ø15.88) t5/128" (t1.0) ø1-3/8" (ø34.92) over t3/64" (t1.1)
3-6. Connect the Tubing
● Use the supplied connector tubing. (See figure below.)
72 type (6-Ton)
2
34
96 type (8-Ton)
34
1
Refrigerant
tubing
Suction tube Brazed connection No
1
Discharge tube Brazed connection No
2
Liquid tube Brazed connection No
3
Balance tube Flared connection No
4
2
1
Refrigerant
tubing
Suction tube Brazed connection
1
Discharge tube Brazed connection
2
Liquid tube Brazed connection No
3
Balance tube Flared connection No
4
Connection method
Connection method
Use supplied
connector tube?
Use supplied
connector tube?
Yes (ø3/4" → ø7/8")
Yes (ø5/8" → ø3/4")
Refrigerant tube port
● Use caulking, putty, or a similar material to fill any
gaps at the refrigerant tube port ( ) in order to
Tubing
cover
Base plate
prevent rainwater, dust or foreign substances from
entering the unit.
* Perform this work even if the tubing is routed out
in a downward direction.
Tubing routed out forward
26
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Tubing routed out downward
Page 27
CAUTION
Brazing locations
Field-supply tube
Taping
Remote valve
Nitrogen
Pressure-reducing valve (regulator)
Use two adjustable wrenches, as shown in the figure,
when removing the liquid tube valve flare nut.
1. Do not apply a wrench to the valve cap when removing or
installing the flare nuts. Doing so may damage the valve.
Do not apply an adjustable wrench
to the hexagonal part.
Do not use two adjustable wrenches
when removing or installing the balance
tube flare nut. In particular, do not apply
an adjustable wrench to the hexagonal
part at the top of the valve.
(If force is applied to this part,
gas leakage will occur.)
2. If the valve cap is left off for a long period of time, refrigerant
leakage will occur. Therefore, do not leave the valve cap off.
3. Applying refrigerant oil to the flare surface can be effective in
preventing gas leakage, however be sure to use a refrigerant
oil which is suitable for the refrigerant that is used in the system.
(This unit utilizes R410A refrigerant, and the refrigerant oil is
ether oil (synthetic oil). However, hub oil (synthetic oil) can also
be used.)
● Tighten each cap as specified below.
Valve cap
Flare nut
Service port cap
Tightening torque for each cap
Service port cap
(width 19/32")
Valve cap
(width 55/64")
Flare nut
(valve dia. ø3/8")
60 – 100 lbs · in (70 – 120 kgf · cm)
170 – 220 lbs · in (200 – 250 kgf · cm)
300 – 360 lbs · in (340 – 420 kgf · cm)
● Precautions for brazing
Be sure to replace the air inside the tube with nitrogen to prevent oxide film from forming during the brazing process.
Be sure to use a damp cloth or other means to cool the valve unit during brazing.
Work method
1. Be sure to use nitrogen. (Oxygen, CO2, and CFC must not be used.)
2. Use a pressure-reducing valve on the nitrogen tank.
3. Do not use agents intended to prevent the formation of oxide film. They will adversely affect the
refrigeration oil, and may cause equipment failure.
4. The balance tube is not used if only 1 outdoor unit is installed.
Use the unit in the same conditions as when it was shipped from the factory.
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27
Page 28
4. ELECTRICAL WIRING
4-1. General Precautions on Wiring
(1) Before wiring, confirm the rated voltage of the unit
as shown on its nameplate, then carry out the
wiring closely following the wiring diagram.
(2) Provide a power outlet to be used exclusively for
each unit, and a power supply disconnect, circuit
breaker and earth leakage breaker for overcurrent
protection should be provided in the exclusive line.
(3) To prevent possible hazards from insulation failure,
the unit must be grounded.
(4) Each wiring connection must be done in
accordance with the wiring system diagram. Wrong
wiring may cause the unit to misoperate or become
damaged.
(5) Do not allow wiring to touch the refrigerant tubing,
compressor, or any moving parts of the fan.
(6) Unauthorized changes in the internal wiring can be
very dangerous. The manufacturer will accept no
responsibility for any damage or misoperation that
occurs as a result of such unauthorized changes.
(7) Regulations on wire diameters differ from locality
to locality. For field wiring rules, please refer to your
LOCAL ELECTRICAL CODES before beginning.
You must ensure that installation complies with all
relevant rules and regulations.
(8) To prevent malfunction of the air conditioner caused
by electrical noise, care must be taken when wiring
as follows:
● The remote control wiring and the inter-unit control
wiring should be wired apart from the inter-unit
power wiring.
● Use shielded wires for inter-unit control wiring
between units and ground the shield on both sides.
(9) If the power supply cord of this appliance is
damaged, it must be replaced by a repair shop
appointed by the manufacture, because special
purpose tools are required.
4-2. Recommended Wire Length and Wire Diameter for Power Supply System
Outdoor unit
Time delay fuse or
circuit capacity
U-72MF1U9
U-72MF1U9E
U-96MF1U9
U-96MF1U9E
Indoor unit
Type
K1 10 – 16 A
D1, U1, Y1, F1, M1, T1, P1, R1 10 – 16 A
E1 10 – 16 A
Control wiring
(A) Inter-unit (between outdoor and
indoor units) control wiring*
AWG #18 (0.75 mm²) AWG #18 (0.75 mm²) AWG #18 (0.75 mm²)
Max. 3,280 ft. Max. 1,640 ft. Max. 650 ft. (Total)
Time delay fuse or
40 A
45 A
circuit capacity
(B) Remote control wiring (C) Control wiring for group control
NOTE
* With ring-type wire terminal.
28
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(D) Inter-outdoor unit control wiring
AWG #18 (0.75 mm²)
Max. 980 ft.
Page 29
4-3. Wiring System Diagram
Power supply
208 / 230V, 60Hz, 1-PH
Remote
Controller
WHT
BLK
Power supply
208 / 230V, 60Hz, 1-PH
Remote
Controller
WHT
BLK
Group control:
Power supply
208 / 230V, 60Hz, 1-PH
L1
L2
Ground
1
1
2
2
L1
L2
Ground
1
1
2
2
L1
L2
Ground
Indoor
C
unit (No. 1)
L1
L2
U1
U2
R1
R2
Indoor
unit (No. 2)
L1
L2
U1
U2
R1
R2
Indoor
unit (No. 3)
L1
L2
U1
U2
R1
R2
Outdoor unit
A
INV unit
1
2
3
4
L1
L2
L3
*
L1
Power supply
L2
208 / 230V, 60Hz, 3-PH
L3
Ground
A
Inter-outdoor unit control wiring
D
Outdoor unit
INV unit
L1
L2
3
L3
4
A
*
L1
Power supply
L2
208 / 230V, 60Hz, 3-PH
L3
Ground
Disconnect switch
*
(Field Supply)
* NOTE:
Disconnect Switch may be needed by the
National/Local code.
ALWAYS COMPLY WITH NATIONAL AND
LOCAL CODE REQUIREMENTS.
*
B
*
B
*
A
B
Indoor
unit (No. n)
BLK
WHT
L1
L2
U1
U2
3
RC
1
K1 Type
Power supply
208 / 230V, 60Hz, 1-PH
Remote
Controller
2
BLK
1
WHT
CONNECTOR
2P(WHT)
L1
L2
Ground
BLK
WHT
BLK
WHT
*
NOTE
(1) Refer to Section 4-2. “Recommended Wire Length and
Wire Diameter for Power Supply System” for the
explanation of “A,” “B,” “C,” and “D,” in the above
diagram.
(2) The basic connection diagram of the indoor unit shows
the 7P terminal board, so the terminal boards in your
equipment may differ from the diagram.
(3) Refrigerant Circuit (R.C.) address should be set before
turning the power on.
(4) Regarding the R.C. address setting, refer to Section
7-4. “Auto Address Setting”. Address setting can be
executed by remote controller automatically.
(BLU)
4P terminal board
L1 L2 L3
4P terminal board
1234
Inter-unit
control wiring
Outdoor Unit
Inter-outdoor unit
control wiring
29
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Page 30
(1) When linking outdoor units in a network, disconnect the terminal extended from the short plug (CN003, 2P Black,
CAUTION
location: right bottom on the outdoor main control PCB) from all outdoor units except any one of the outdoor units.
(When shipping: In shorted condition.)
For a system without link (no connection wiring between outdoor units), do not remove the short plug.
(2) Do not install the inter-unit control wiring in a way that forms a loop. (Fig. 4-1)
Outdoor unit Outdoor unit Outdoor unit
Prohibited
Indoor unit Indoor unit Indoor unit Indoor unit Indoor unit
Fig. 4-1
(3) Do not install inter-unit control wiring such as star branch wiring. Star branch wiring causes mis-address setting.
(Fig. 4-2)
Outdoor unit Indoor unit Indoor unit
NO
(4) If branching the inter-unit control wiring, the number of branch points should be 16 or fewer.
(Branches less than 3.3 ft. are not included in the total branch number.) (Fig. 4-3)
Outdoor unit Outdoor unit Outdoor unit
Indoor unit Indoor unit
Branch point
Fig. 4-2
Prohibited
Branch
point
16 or fewer
Indoor unit Indoor unit Indoor unit Indoor unit
more than 3.3 ft.
Indoor unit
more than 3.3 ft.
Indoor unit
less than 3.3 ft.
Indoor unit
Indoor unit Indoor unit Indoor unit
Fig. 4-3
30
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Wire
Special
washer
Screw
Ring pressure
terminal
Terminal plate
Screw and
Special washer
Ring
pressure
terminal
Wire
WARNING
Loose wiring may cause the
terminal to overheat or result
in unit malfunction. A fire
hazard may also exist.
Therefore, ensure that all
wiring is tightly connected.
When connecting each power wire to the terminal,
follow the instructions on “How to connect wiring to the
terminal” and fasten the wire securely with the fixing
screw of the terminal plate.
How to connect wiring to the terminal
■ For stranded wiring
(1) Cut the wire end with cutting pliers, then strip the
insulation to expose the stranded wiring approx.
3/8" and tightly twist the wire ends. (Fig. 4-4)
(2) Using a Phillips head screwdriver, remove the
terminal screw(s) on the terminal plate.
(3) Using a ring connector fastener or pliers, securely
clamp each stripped wire end with a ring pressure
terminal.
(4) Place the ring pressure terminal, and replace and
tighten the removed terminal screw using a
screwdriver. (Fig. 4-5)
Stranded wire
Strip 3/8"
Ring
pressure
terminal
Fig. 4-4
Fig. 4-5
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5. HOW TO PROCESS TUBING
Flare tool
Flare nut
Copper
tubing
The liquid tubing side is connected by a flare nut, and the gas
tubing side is connected by brazing.
5-1. Connecting the Refrigerant Tubing
Use of the Flaring Method
Many of conventional split system air conditioners employ the
flaring method to connect refrigerant tubes which run between
indoor and outdoor units. In this method, the copper tubes are
flared at each end and connected with flare nuts.
Before
Deburring
After
Flaring Procedure with a Flare Tool
(1) Cut the copper tube to the required length with a tube
cutter. It is recommended to cut approx. 1 – 2 ft. longer
than the tubing length you estimate.
(2) Remove burrs at the end of the copper tube with a tube
reamer or file. This process is important and should be
done carefully to make a good flare. (Fig. 5-1)
NOTE
When reaming, hold the tube end downward and be sure that
no copper scraps fall into the tube. (Fig. 5-2)
(3) Remove the flare nut from the unit and be sure to mount
it on the copper tube.
(4) Make a flare at the end of copper tube with a flare tool.
(Fig. 5-3)
NOTE
A good flare should have the following characteristics:
● inside surface is glossy and smooth
● edge is smooth
● tapered sides are of uniform length
Fig. 5-1
Copper
tubing
Reamer
Fig. 5-2
Fig. 5-3
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Caution Before Connecting Tubes Tightly
(1) Apply a sealing cap or water-proof tape to prevent
dust or water from entering the tubes before they
are used.
(2) Be sure to apply refrigerant lubricant to the matching
surfaces of the flare and union before connecting
them together. This is effective for reducing gas
leaks.
(Fig. 5-4)
(3) For proper connection, align the union tube and
flare tube straight with each other, then screw in the
flare nut lightly at first to obtain a smooth match.
(Fig. 5-5)
● Adjust the shape of the liquid tube using a tube
bender at the installation site and connect it to the
liquid tubing side valve using a flare.
Apply refrigerant
lubricant
Fig. 5-4
Union
Flare nut
Fig. 5-5
Cautions During Brazing
● Replace air inside the tube with nitrogen gas to
prevent copper oxide film from forming during
the brazing process. (Oxygen, carbon dioxide
and Freon are not acceptable.)
● Do not allow the tubing to get too hot during
brazing. The nitrogen gas inside the tubing may
overheat, causing refrigerant system valves to
become damaged. Therefore allow the tubing to
cool when brazing.
● Use a reducing valve for the nitrogen cylinder.
● Do not use agents intended to prevent the
formation of oxide film. These agents adversely
affect the refrigerant and refrigerant oil, and
may cause damage or malfunctions.
5-2. Connecting Tubing Between Indoor and
Outdoor Units
(1) Tightly connect the indoor-side refrigerant tubing
extended from the wall with the outdoor-side tubing.
(2) To fasten the flare nuts, apply specified torque as at
right:
● When removing the flare nuts from the tubing
connections, or when tightening them after
connecting the tubing, be sure to use 2 adjustable
wrenches or spanners as shown. (Fig. 5-6)
If the flare nuts are over-tightened, the flare may be
damaged, which could result refrigerant leakage and
cause in injury or asphyxiation to room occupants.
● For the flare nuts at tubing connections, be sure to
use the flare nuts that were supplied with the unit,
or else flare nuts for R410A (type 2). The refrigerant
tubing that is used must be of the correct wall
thickness as shown in the table at right.
Torque wrench
·
inch
·
cm)
·
·
·
·
·
·
·
inch
cm)
inch
cm)
inch
cm)
inch
·
cm)
Spanner
Tube thickness
t1/32"
(0.8 mm)
t1/32"
(0.8 mm)
t1/32"
(0.8 mm)
t5/128"
(1.0 mm)
over t5/128"
(over 1.0 mm)
Indoor unit
Tube diameter
ø1/4" (ø6.35 mm)
ø3/8" (ø9.52 mm)
ø1/2" (ø12.7 mm)
ø5/8" (ø15.88 mm)
ø3/4" (ø19.05 mm)
Outdoor unit
Fig. 5-6
Tightening torque,
approximate
120 – 160 lbs
(140 – 180 kgf
300 – 360 lbs
(340 – 420 kgf
430 – 480 lbs
(490 – 550 kgf
590 – 710 lbs
(680 – 820 kgf
870 – 1040 lbs
(1000 – 1200 kgf
Because the pressure is approximately 1.6 times
higher than conventional refrigerant pressure,
the use of ordinary flare nuts (type 1) or thinwalled tubes may result in tube rupture, injury, or
asphyxiation caused by refrigerant leakage.
● In order to prevent damage to the flare caused by
over-tightening of the flare nuts, use the table above
as a guide when tightening.
● When tightening the flare nut on the liquid tube, use
an adjustable wrench with a nominal handle length
of 7-7/8 in.
33
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Unit side
insulator
Insulation tape (white)
(supplied)
Sealer (supplied)
Flare insulator (supplied)
Tube insulator
(not supplied)
Heat resistant
248°F or above
Vinyl clamps (supplied)
Flare nut
5-3. Insulating the Refrigerant Tubing
CAUTION
Gas tubing
Liquid tubing
Insulation
Suction tubing
Cosmetic
(finishing) tape
Discharge tubing
Liquid tubing
Balance tubing
Insulation
Tubi ng In sula t ion
● Thermal insulation must be applied to all unit tubing,
including the distribution joint (purchased separately).
(Fig. 5-7)
* For gas tubing, the insulation material must be heat
resistant to 248°F or above. For other tubing, it
must be heat resistant to 176°F or above.
Insulation material thickness must be 25/64 in. or
greater.
If the conditions inside the ceiling exceed DB 86°F
and RH 70%, increase the thickness of the gas
tubing insulation material by 1 step.
If the exterior of the outdoor unit
valves has been finished with
a square duct covering, make
sure you allow sufficient space
to use the valves and to allow
the panels to be attached and
removed.
Two tubes arranged together
Three tubes arranged together
Cosmetic
(finishing) tape
Liquid tubing
Insulation
Gas tubing
Balance tubing
Four tubes arranged together
Taping the flare nuts
Wind the white insulation tape around the flare nuts at
the gas tube connections. Then cover up the tubing
connections with the flare insulator, and fill the gap
at the union with the supplied black insulation tape.
Finally, fasten the insulator at both ends with the
supplied vinyl clamps. (Fig. 5-8)
Fig. 5-7
Fig. 5-8
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5-4. Taping the Tubes
(1) At this time, the refrigerant tubes (and electrical
wiring if local codes permit) should be taped
together with armoring tape in 1 bundle. To prevent
the condensation from overflowing the drain pan,
keep the drain hose separate from the refrigerant
tubing.
(2) Wrap the armoring tape from the bottom of the
outdoor unit to the top of the tubing where it enters
the wall. As you wrap the tubing, overlap half of
each previous tape turn.
(3) Clamp the tubing bundle to the wall, using 1 clamp
approx. each ft. (Fig. 5-9)
NOTE
Insulated tubes
Clamp
Drain hose
Do not wind the armoring tape too tightly since this
will decrease the heat insulation effect. Also ensure
that the condensation drain hose splits away from the
bundle and drips clear of the unit and the tubing.
5-5. Finishing the Installation
After finishing insulating and taping over the tubing, use
sealing putty to seal off the hole in the wall to prevent
rain and draft from entering. (Fig. 5-10)
Fig. 5-9
Apply putty here
Tubing
Fig. 5-10
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6. AIR PURGING
Manifold gauge
CAUTION
CAUTION
Air and moisture in the refrigerant system may have
undesirable effects as indicated below.
● pressure in the system rises
● operating current rises
● cooling (or heating) efficiency drops
● moisture in the refrigerant circuit may freeze and
block capillary tubing
● water may lead to corrosion of parts in the refrigerant
system
Therefore, the indoor unit and tubing between the
indoor and outdoor unit must be leak tested and
evacuated to remove any noncondensables and
moisture from the system.
Fig. 6-1a
Vacuum pump
Outlet
Inlet
Fig. 6-1b
Valve cap
■ Air Purging with a Vacuum Pump (for Test Run)
Preparation
Check that each tube between the indoor and outdoor
units have been properly connected and all wiring for
the test run has been completed. Remove the valve
caps from all service ports on the outdoor unit. (Fig.
6-2) Note that all service valves on the outdoor unit are
kept closed at this stage.
The balance tube leak test is not necessary if only 1
outdoor unit is installed.
Leak test
(1) Attach a manifold valve (with pressure gauges) and
dry nitrogen gas cylinder to all service ports with
charge hoses.
The balance tube leak test is not necessary if only 1
outdoor unit is installed.
Use a manifold valve for air
purging. If it is not available,
use a stop valve for this
purpose. The “Hi” knob of
the manifold valve must
always be kept closed.
(2) Pressurize the system to no more than 512 psig
(36 kgf/cm2G) with dry nitrogen gas and close the
cylinder valve when the gauge reading reaches
512 psig (36 kgf/cm2G). Then, test for leaks with
liquid soap.
To avoid nitrogen entering the
refrigerant system in a liquid
state, the top of the cylinder
must be higher than the
bottom when you pressurize
the system. Usually, the
cylinder is used in a vertical
standing position.
36
Pressure
gauge
Flare nut
Suction
tube
Discharge
tube
Liquid
tube
Balance
tube
Fig. 6-2
Manifold valve
Lo Hi
Cylinder
valve
Open
Open
Open
Open
Fig. 6-3
Service port cap
Charge hose
Nitrogen gas cylinder
(In vertical standing
position)
Close
Outdoor unit
Close
Close
Close
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(3) Do a leak test of all joints of the tubing (both indoor
and outdoor) and all service valves. Bubbles
indicate a leak. Wipe off the soap with a clean cloth
after a leak test.
(4) After the system is found to be free of leaks, relieve
the nitrogen pressure by loosening the charge hose
connector at the nitrogen cylinder. When the system
pressure is reduced to normal, disconnect the hose
from the cylinder.
Evacuation
(1) Attach the charge hose end described in the
preceding steps to the vacuum pump to evacuate
the tubing and indoor unit. Confirm that the “Lo”
knob of the manifold valve is open. Then, run the
vacuum pump. The operation time for evacuation
varies with the tubing length and capacity of the
pump. The following table shows the amount of time
for evacuation:
Required time for evacuation
when 30 gal/h vacuum pump is used
If tubing length is
less than 49 ft.
45 min. or more 90 min. or more
If tubing length is
longer than 49 ft.
Evacuation is not necessary for the balance tube if
only 1 outdoor unit is installed.
NOTE
The required time in the above table is calculated
based on the assumption that the ideal (or target)
vacuum condition is less than –14.7 psig (–755 mmHg,
5 Torr).
Pressure
gauge
Suction
tube
Discharge
tube
Liquid
tube
Balance
tube
Manifold valve
Lo Hi
Open
Open
Open
Open
Vacuum pump
Close
Outdoor unit
Close
Close
Close
Fig. 6-4
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(2) When the desired vacuum is reached, close the “Lo”
CAUTION
Outdoor unit
Open
Close
Discharge
tube
Suction
tube
Liquid
tube
Open
Close
Balance
tube
Open
Close
Open
Open
knob of the manifold valve and turn off the vacuum
pump. Please confirm that the gauge pressure is
under –14.7 psig (–755 mmHg, 5 Torr) after 4 to 5
minutes of vacuum pump operation.
Charging additional refrigerant
Use a cylinder designed for
use with R410A.
● Charging additional refrigerant (calculated from the
liquid tube length as shown in Section 1-8 “Additional
Refrigerant Charge”) using the liquid tube service
valve. (Fig. 6-5)
● Use a balance or scale to measure the refrigerant
accurately.
Pressure
gauge
Manifold valve
Lo Hi
Valve
Liquid
R410A
Close
Suction
tube
Close
● If the additional refrigerant charge amount cannot be
charged at once, charge the remaining refrigerant in
liquid form by using the suction tube service valve
with the system in Cooling mode at the time of test
run. (Fig. 6-6)
● Close the valve on the cylinder containing R410A.
Finishing the job
(1) With a flathead screwdriver, turn the liquid tube
service valve counter-clockwise to fully open the
valve.
(2) Turn the all service valve counter-clockwise to fully
open the valve.
(3) Close all stop valves and loosen the “LO” knob of
the manifold valve.
(4) Loosen the charge hose connected to all service
port, then remove the hose.
(5) Replace all valve caps at all service ports and fasten
them securely.
This completes air purging with a vacuum pump. The air
conditioner is now ready for a test run.
Discharge
tube
Liquid
tube
Balance
tube
Close
Open
Close
Fig. 6-5
Outdoor unit
Close
Close
Close
Fig. 6-6
38
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7. TEST RUN
7-1. Preparing for Test Run
● Before attempting to start the air conditioner,
check the following.
(1) The control wiring is correctly connected and all
electrical connections are tight.
(2) The transportation pads for the indoor fan have
been removed. If not, remove them now.
(3) The power has been connected to the unit for at
least 5 hours before starting the compressor. The
bottom of the compressor should be warm to the
touch and the crankcase heater around the feet of
the compressor should be hot to the touch.
(Fig. 7-1)
(4) If only 1 outdoor unit is installed, close the service
valve on the balance tubes, and open the service
valve on the other 3 tubes (suction, discharge, and
liquid tubes). (Fig. 7-2)
If 2 or 3 outdoor units are installed, open the service
valves on all 4 tubes (suction, discharge, liquid, and
balance tubes). (Fig. 7-2)
(5) Request that the customer be present for the trial
run.
Explain the contents of the instruction manual, then
have the customer actually operate the system.
(6) Be sure to give the instruction manual and warranty
certificate to the customer.
(7) When replacing the control PCB, be sure to make
all the same settings on the new PCB as were in
use before replacement.
The existing EEPROM is not changed, and is
connected to the new control PCB.
Power mains switch
Balance tube
Liquid tube
Discharge tube
ON
(Power must be turned ON
at least 5 hours before
attempting test run)
Fig. 7-1
Suction tube
Fig. 7-2
39
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7-2. Test Run Procedure
<Outdoor unit control PCB>
Unit No. setting switch
(S007)
<Outdoor unit control PCB>
Unit No. setting switch
(S006)
<Outdoor unit control PCB>
Unit No. setting switch
(S004 and S005)
Recheck the items to check before the test run.
Have the outdoor sub units been connected?
YES
Set the unit address.
Set the No. of outdoor units.
Set the No. of indoor units.
Items to Check Before the Test Run
1. Turn the remote power switch on at least 5
hours before the test, in order to energize the
crankcase heater.
NO
2. Turn the outdoor service valves (4 locations) to
the full-open positions.
●
Use caution when making the settings. If
*1
there are duplicated system addresses, or if
the settings for the Nos. of the indoor units
are not consistent, an alarm will occur and
the system will not start.
●
These settings are not made on the indoor
unit PCB.
*1 The unit with the unit No. set to 1 is the main unit.
All other units are sub units.
(Check the link wiring.)
<Outdoor unit control PCB>
Unit No. setting switch
(S002 and S003)
Refer to Fig. 7-4
When multiple outdoor main units exist, disconnect the terminals
extended from the shorted plugs (CN003) at all outdoor main unit PCBs
except for 1. Alternatively, move the sockets to the OPEN side.
NO
Is it OK to start the compressors?
Turn ON the indoor and
outdoor unit power.
*2
Short-circuit the mode change pin
(CN101) on the outdoor main unit
PCB. At the same time, short-circuit
the automatic address pin (CN100)
for 1 second or longer, then release it.
*3
Start indoor and outdoor unit
cooling operation.
LED 1 and 2 blink alternately.
Are LEDs 1 and 2 on the
outdoor unit PCB OFF?
Are the inter-unit control wires
connected to more than 1 refrigerant
system?
YES
Set the system address.
Is it possible to turn ON the power only
for the 1 refrigerant system where the
test run will be performed?
NO
Will automatic address setting be
performed in Heating mode?
YES
CASE 3ACASE 3B
Is it OK to start the compressors?
Turn ON the indoor and
outdoor unit power.
*2
Short-circuit the automatic
address pin (CN100) on the
outdoor main unit PCB for
1 second or longer, then
release it.
*3
Start indoor and outdoor unit
heating operation.
LED 1 and 2 blink alternately.
NO
NO
YES
Make necessary corrections.
Turn OFF the indoor and
Check the alarm contents.
Make necessary
corrections
Turn OFF the indoor
and outdoor unit
Check the alarm
contents.
*2 A minimum of 5 hours must have passed after the
power was turned ON to the outdoor unit.
*3 All indoor units operate in all refrigerant systems
where the power is ON.
CASE 1
Note:
It is not necessary to remove the
socket that is used to short-circuit
the terminal plugs from the outdoor
sub unit PCBs.
CASE 2
outdoor unit power.
NO
Refer to “Table of
Self-Diagnostic Functions and
Description of Alarm Displays.”
Turn ON the indoor and
outdoor unit power for that
refrigerant system only.
Short-circuit the automatic address
pin (CN100) on the outdoor main
unit PCB for 1 second or longer, then
release it.
LED 1 and 2 blink alternately
(about 2 or 3 minutes).
Are LEDs 1 and 2 on the
outdoor unit PCB OFF?
YES
YES
Check that test run preparation is OK.
(Do not allow the short-circuited pins to remain short-circuited.)
Set the Wired Remote Controller for test run.
Refer to the Remote
Controller test-run
settings.
Does system operate?
NO
Check and make corrections according to
“Table of Self-Diagnostic Functions.”
YES
Return Remote Controller to normal mode
End test run.
Fig. 7-3
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7-3. Main Outdoor Unit PCB Setting
Fig. 7-4
41
CN003
CN101
CN100
S003 S002S004S005S006S007
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●
Examples of the No. of indoor units settings (S005, S004)
No. of indoor units
(3P DIP switch, blue)
10 20 30
Indoor unit setting (S005)
1 unit (factory setting)
11 units
21 units
31 units
40 units
●
Examples of refrigerant circuit (R.C.) address settings (required when link wiring is used) (S003, S002)
All OFF
1 ON
2 ON
3 ON
1 & 3 ON
ON
1
ON
1
ON
1
ON
1
ON
1
ON
3
2
OFF
ON
3
2
OFF
ON
3
2
OFF
ON
3
2
OFF
ON
3
2
OFF
System address (S003)
System address No.
(2P DIP switch, blue)
10 20
ON
System 1 (factory setting)
System 11
System 21
System 30
Both OFF
1 ON
2 ON
1 & 2 ON
ON
2
OFF
1
ON
ON
2
1
OFF
ON
ON
2
OFF
1
ON
ON
2
1
OFF
Indoor unit setting (S004)
(Rotary switch, red)
1
Set to 1
1
Set to 1
1
Set to 1
1
Set to 1
0
Set to 0
System address (S002)
(Rotary switch, black)
1
Set to 1
1
Set to 1
1
Set to 1
0
Set to 0
●
Examples of the No. of outdoor units settings (S006)
No. of outdoor units
1 unit (factory setting)
2 units
3 units
●
Address setting of main outdoor unit (S007)
Unit No. setting
Unit No. 1 (main unit)
(factory setting)
●
Address setting of sub outdoor unit
Unit No. setting
Unit No. 2 (sub unit)
(factory setting)
Unit No. 3 (sub unit)
Outdoor unit setting (S006)
(3P DIP switch, blue)
1 ON
2 ON
1 & 2 ON
ON
12
ON
1
21ON3
2
ON
OFF
ON
3
OFF
ON
3
OFF
Address setting of outdoor unit (S007)
(3P DIP switch, blue)
ON
21ON3
OFF
Address setting of outdoor unit (S007)
(3P DIP switch, blue)
2 ON
1 & 2 ON
ON
12
ON
21
ON
3
OFF
ON
3
OFF
The sub unit control PCB contains the same switches as the main unit control PCB for No. of indoor units, No. of outdoor units, and
system address. However it is not necessary to set these switches.
42
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7-4. Auto Address Setting
Basic wiring diagram: Example (1)
s If link wiring is not used
(The inter-unit control wires are not connected to multiple refrigerant systems.)
Indoor unit addresses can be set without operating the compressors.
No. 1 (main outdoor unit)
settings
System address
(system 1 setting)
(S003)(S002)
ON
1
No. of
outdoor
units (3 units
setting)
ON
2
1
OFF
ON
2
3
1
Outdoor Unit
ON
OFF
No. of indoor units
(10 units setting)
(S005)
1ON3
Unit number
setting
(Unit No. 1)
Unit
No. 1
(Main)
(S004)
0
ON
2
OFF
)700S()600S(
ON
1
2
3
OFF
ON
Unit
number
setting
(Unit No. 2)
Leave the socket that
is used to short-circuit
the terminal plug.
(CN003)
Inter-outdoor unit
control wiring
Inter-unit control wiring
No. 2 (sub unit)
(S007)
ON
123
Unit
No. 2
(Sub)
ON
OFF
Inter-outdoor unit
control wiring
Unit
number
setting
(Unit No. 3)
No. 3 (sub unit)
(S007)
ON
1
2
3
Unit
No. 3
(Sub)
ON
OFF
Indoor Unit
Remote Controller
1-1
1-2 1-3
Remote control
communication wiring
1-10
Fig. 7-5
Case 1
(1) Automatic Address Setting from the Outdoor Unit
1. To set the number of outdoor units, on the outdoor main unit control PCB set the No. of outdoor units DIP switch (S006) to
ON
ON
(3 units), and set the unit No. DIP switch (S007) to
123
OFF
2. On the No. 2 (sub) unit control PCB, set the unit No. switch (S007) to
On the No. 3 (sub) unit control PCB, set the unit No. switch (S007) to
ON
1
(unit No. 1 - main outdoor unit).
2
3
ON
(unit No. 2).
3
2
1
ON
(unit No. 3).
123
3. On the outdoor main unit control PCB, check that the system address rotary switch (S002) is set to “1” and that the DIP switch
ON
(S003) is set to
ON
“0.” (These are the settings at the time of factory shipment.)
1
2
OFF
4. To set the number of indoor units that are connected to the outdoor unit to 10 on the outdoor main unit control PCB, set the No.
of indoor units DIP switch (S005) to
ON
1
ON
“1.” and set the rotary switch (S004) to “0.”
2
3
OFF
5. Turn ON the power to the indoor and outdoor units.
6. On the outdoor main unit control PCB, short-circuit the automatic address pin (CN100) for 1 second or longer, then release it.
↓
(Communication for automatic address setting begins.)
↓
* To cancel, again short-circuit the automatic address pin (CN100) for 1 second or longer, then release it.
The LED that indicates that automatic address setting is in progress turns OFF and the process is stopped.
Be sure to perform automatic address setting again.
(Automatic address setting is completed when LEDs 1 and 2 on the outdoor main unit control PCB turn OFF.)
↓
7. Operation from the remote controllers is now possible.
* To perform automatic address setting from the remote controller, perform steps 1 to 5, then use the remote controller and
complete automatic address setting.
● Refer to “Automatic Address Setting from the Remote Controller.”
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Basic wiring diagram: Example (2)
No. 1 (main outdoor unit) settings
System address
(system 1 setting)
(S003)(S002)
ON
ON
1
2
1
OFF
No. of
outdoor units
(3 units
setting)
ON
1
(S006)
2
ON
3
OFF
Outdoor unit
system 1
Indoor unit
Remote
Controller
No. 2
Refrigerant
circuit
System address
(system 2 setting)
2
No. of
outdoor
units (2 units
setting)
s If link wiring is used
No. of indoor units
(13 units setting)
(S004)
(S005)
2
1
Unit
No. 1
(Main)
ON
3
OFF
(S007)
ON
2
3
1
Leave the socket that
is used to short-circuit
the terminal plug.
(CN003)
OFF
ON
Unit
number
setting
(unit No. 1)
1-1 1-2
No. 1 (main unit) settings
No. of indoor units
(9 units setting)
ON
OFF
(S004)
(S005)
1ON3
Unit
number
setting
(unit No. 1)
(S003)(S002)
ON
1
2
(S006)
ON
123
ON
OFF
* When multiple outdoor main units exist, remove the socket that is
Alternatively, move the sockets to the “OPEN” side.
No. 2 (sub unit)
Unit
ON
number
setting
(unit No. 2)
Inter-unit control wiring
9
ON
2
OFF
(S007)
ON
ON
2
3
1
OFF
used to short-circuit the terminal plug (CN003) from all outdoor
main unit PCBs except for one unit.
No. 3 (sub unit)
Unit
number
setting
(unit No. 3)
Inter-outdoor unit
ON
(S007)
1
3
2
Unit
No. 3
(Sub)
ON
OFF
ON
1
(S007)
2
Unit
No. 2
(Sub)
ON
3
OFF
control wiring
Inter-outdoor unit
control wiring
31-13-1
Remote control
communication wiring
No. 2 (sub unit) settings
Unit
number
setting
(unit No. 2)
(S007)
ON
123
ON
OFF
Outdoor unit
system 2
Unit
No. 1
(Main)
Move the socket to
the
“
OPEN” side
(CN003).
Inter-unit control wiring
To other system
link wiring
Indoor unit
Remote
Controller
Remote control
commuication wiring
Make settings as appropriate for the cases listed below.
(Refer to the instructions on the following pages.)
· Indoor and outdoor unit power can be turned ON for each system separately.
· Indoor and outdoor unit power cannot be turned ON for each system separately.
Automatic address setting in Heating mode
Automatic address setting in Cooling mode
Fig. 7-6
44
Unit
No. 2
(Sub)
Inter-outdoor unit control wiring
9-22-21-2
Case 2
Case 3A
Case 3B
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Case 2
● Indoor and outdoor unit power can be turned ON for each system separately.
Automatic Address Setting (no compressor operation)
Indoor unit addresses can be set without operating the compressors.
Automatic Address Setting from Outdoor Unit
ON
ON
ON
(unit No. 1).
2
3
1
(unit No. 2).
3
2
1
(unit No. 3).
3
2
1
1. On the No. 1 (main) unit control PCB, set the unit No. switch (S007) to
On the No. 2 (sub) unit control PCB, set the unit No. switch (S007) to
On the No. 3 (sub) unit control PCB, set the unit No. switch (S007) to
2. To set the number of outdoor units on the outdoor main unit control PCB, set the No. of outdoor units DIP switch
(S006) to
ON
123
ON
(3 units).
OFF
3. On the outdoor main unit control PCB, check that the system address rotary switch (S002) is set to “1” and that the
ON
DIP switch (S003) is set to “0”
ON
1
. (These are the settings at the time of factory shipment.)
2
OFF
4. To set the number of indoor units that are connected to the outdoor unit to 13 on the outdoor main unit control
ON
PCB, set the No. of indoor units DIP switch (S005) to “1”
1
ON
, and set the rotary switch (S004) to “3.”
2
3
OFF
5. Turn on power to all indoor and outdoor units in the system.
6. Short-circuit the automatic address pin at the outdoor main unit (CN100) for 1 second or longer, then release it.
↓
(Communication for automatic address setting begins.)
↓
* To cancel, again short-circuit the automatic address pin (CN100) for 1 second or longer, then release it.
The LED that indicates automatic address setting is in progress turns OFF and the process is stopped.
Be sure to perform automatic address setting again.
(Automatic address setting is completed when LEDs 1 and 2 on the outdoor main unit control PCB turn OFF.)
↓
7. Next turn the power ON only for the indoor and outdoor units of the next (different) system. Repeat steps 1 – 5 in
the same way to complete automatic address settings for all systems.
↓
8. Operation from the remote controllers is now possible.
* To perform automatic address setting from the remote controller, perform steps 1 – 5, then use the remote
controller and complete automatic address setting.
● Refer to “Automatic Address Setting from Remote Controller.”
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Case 3A
● Indoor and outdoor unit power cannot be turned ON for each system separately.
Automatic Address Setting in Heating Mode
In the following, automatic setting of indoor unit addresses is not possible if the compressors are not operating.
Therefore perform this process only after completing all refrigerant tubing work.
Automatic Address Setting from Outdoor Unit
1. Perform steps 1 – 4 in the same way as for
Case 2
.
5. Turn the indoor and outdoor unit power ON at all systems.
↓
6. To perform automatic address setting in
Heating mode
, on the outdoor main unit control PCB in the
refrigerant system where you wish to set the addresses, short-circuit the automatic address pin (CN100) for 1
second or longer, then release it.
(Be sure to perform this process for one system at a time. Automatic address settings cannot be performed for
more than one system at the same time.)
↓
(Communication for automatic address setting begins, the compressors turn ON, and automatic address
setting in Heating mode begins.)
(All indoor units operate.)
↓
* To cancel, again short-circuit the automatic address pin (CN100) for 1 second or longer, then release it.
The LED that indicates automatic address setting is in progress turns OFF and the process is stopped.
Be sure to perform automatic address setting again.
(Automatic address setting is completed when the compressors stop and LEDs 1 and 2 on the main unit
control PCB turn OFF.)
↓
7. At the outdoor main unit in the next (different) system, short-circuit the automatic address pin (CN100) for 1
second or longer, then release it.
↓
(Repeat the same steps to complete automatic address setting for all units.)
↓
8. Operation from the remote controllers is now possible.
* To perform automatic address setting from the remote controller, perform steps 1 – 5, then use the remote controller and
complete automatic address setting.
● Refer to “Automatic Address Setting from Remote Controller.”
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Case 3B
● Indoor and outdoor unit power cannot be turned ON for each system separately.
Automatic Address Setting in Cooling Mode
In the following, automatic setting of indoor unit addresses is not possible if the compressors are not operating.
Therefore perform this process only after completing all refrigerant tubing work.
Automatic address setting can be performed during Cooling operation.
Automatic Address Setting from Outdoor Unit
1. Perform steps 1 – 4 in the same way as for
Case 2
.
5. Turn the indoor and outdoor unit power ON at all systems.
↓
6. To perform automatic address setting in
Cooling mode
, on the outdoor main unit control PCB in the
refrigerant system where you wish to set the addresses, short-circuit the mode change 2P pin (CN101). At the
same time, short-circuit the automatic address pin (CN100) for 1 second or longer, then release it. (Be sure to
perform this process for one system at a time. Automatic address settings cannot be performed for more than
one system at the same time.)
↓
(Communication for automatic address setting begins, the compressors turn ON, and automatic address
setting in Cooling mode begins.)
(All indoor units operate.)
↓
* To cancel, again short-circuit the automatic address pin (CN100) for 1 second or longer, then release it.
The LED that indicates automatic address setting is in progress turns OFF and the process is stopped.
Be sure to perform automatic address setting again.
(Automatic address setting is completed when the compressors stop and LEDs 1 and 2 on the outdoor main
unit control PCB turn OFF.)
7. At the outdoor main unit in the next (different) system, short-circuit the automatic address pin (CN100) for 1
second or longer, then release it.
↓
(Repeat the same steps to complete automatic address setting for all units.)
↓
8. Operation from the remote controllers is now possible.
* Automatic address setting in Cooling mode cannot be done from the remote controller.
Automatic Address Setting* from the Remote Controller
Selecting each refrigerant system individually for automatic address setting
---Automatic address setting for each system: Item code “A1”
1. Press the remote controller timer time button and button at the
same time. (Press and hold for 4 seconds or longer.)
2. Next, press either the temperature setting or button.
(Check that the item code is “A1.”)
3. Use either the or button to set the system No. to perform
automatic address setting.
4. Then press the button.
(Automatic address setting for one refrigerant system begins.)
(When automatic address setting for one system is completed, the system
returns to normal stopped status.) <Approximately 4 – 5 minutes is required.>
(During automatic address setting, “ ” is displayed on the remote controller. This message disappears
when automatic address setting is completed.)
5. Repeat the same steps to perform automatic address setting for each successive system.
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LED 1 LED 2
( : ON : Blinking : OFF)
Display meaning
After the power is turned ON (and automatic address setting is not in progress), no communication with the indoor
units in that system is possible.
After the power is turned ON (and automatic address setting is not in progress), 1 or more indoor units are
confirmed in that system; however, the number of indoor units does not match the number that was set.
Alternating
Alternating
Automatic address setting is in progress.
Automatic address setting completed.
Simultaneous
At time of automatic address setting, the number of indoor units did not match the number that was set.
“ ” (when indoor units are operating) indication appears on the display.
Refer to “Table of Self-Diagnostic Functions and Description of Alarm Displays.”
Note: “ ” indicates that the solenoid is fused or that there is a CT detection current failure (current is detected when the
compressor is OFF).
Display during automatic address setting
● On outdoor main unit PCB
LED
* Do not short-circuit the automatic address setting pin (CN100) again while automatic address
1
2
setting is in progress. Doing so will cancel the setting operation and will cause LEDs 1 and 2 to
Blink alternately
turn OFF.
* When automatic address setting has been successfully completed, both LEDs 1 and 2 turn OFF.
* LED 1 is D72. LED 2 is D75.
* If automatic address setting is not completed successfully, refer to the table below and correct the problem. Then perform
automatic address setting again.
● Display details of LEDs 1 and 2 on the outdoor unit control PCB
● Remote Controller’s display
is blinking
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Request concerning recording the indoor/outdoor unit combination Nos.
CAUTION
After automatic address setting has been completed, be sure to record them for future reference.
List the outdoor main unit system address and the addresses of the indoor units in that system in an easily visible
location (next to the nameplate), using a permanent marking pen or similar means that cannot be abraded easily.
Example: (Outdoor) 1 – (Indoor) 1-1, 1-2, 1-3… (Outdoor) 2 – (Indoor) 2-1, 2-2, 2-3…
These numbers are necessary for later maintenance. Please be sure to indicate them.
Checking the indoor unit addresses
Use the remote controller to check the indoor unit address.
<If 1 indoor unit is connected to 1 remote controller>
1. Press and hold the
button and button for 4 seconds or longer (simple settings mode).
2. The address is displayed for the indoor unit that is connected to the remote controller.
(Only the address of the indoor unit that is connected to the remote controller can be checked.)
3. Press the button again to return to normal remote control mode.
<If multiple indoor units are connected to 1 remote controller (group control)>
1. Press and hold the button and button for 4 seconds or longer
(simple settings mode).
2. “ALL” is displayed on the remote controller.
3. Next, press the button.
4. The address is displayed for 1 of the indoor units which is connected to
the remote controller. Check that the fan of that indoor unit starts and
that air is discharged.
5. Press the
button again and check the address of each indoor unit
in sequence.
6. Press the button again to return to normal remote control mode.
7-5. Remote Controller Test Run Settings
1. Press the remote controller button for 4 seconds or longer. Then
press the button.
“TEST” appears on the LCD display while the test run is in progress. The
Number changes to indicate which
indoor unit is currently selected.
Indoor unit address
temperature cannot be adjusted when in Test Run mode.
(This mode places a heavy load on the machines. Therefore use it only
when performing the test run.)
2. The test run can be performed using the HEAT, COOL, or FAN operation
modes.
Note: The outdoor units will not operate for approximately 3 minutes after
the power is turned ON and after operation is stopped.
3. If correct operation is not possible, a code is displayed on the remote
controller’s LCD display.
(Refer to “Table of Self-Diagnostic Functions” and correct the problem.)
4. After the test run is completed, press the button again. Check that
“TEST” disappears from the LCD display. (To prevent continuous test
runs, this remote controller includes a timer function that cancels
the test run after 60 minutes.)
* If the test run is performed using the wired remote controller, operation
Indoor unit address
Number changes to indicate which
indoor unit is currently selected.
is possible even if the cassette-type ceiling panel has not been installed.
(“P09” display does not occur.)
7-6. Caution for Pump Down
Pump down means refrigerant gas in the system is returned to the outdoor unit. Pump down is used when the unit is
to be moved, or before servicing the refrigerant circuit. (Refer to the Service Manual)
This outdoor unit cannot collect more than the rated refrigerant amount as shown by the
nameplate on the back.
If the amount of refrigerant is more than that recommended, do not conduct pump down.
In this case use another refrigerant collecting system.
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7-7. Meaning of Alarm Messages
Table of Self-Diagnostics Functions and Description of Alarm Displays
Alarm messages are indicated by the blinking of LED 1 and 2 (D72, D75) on the outdoor unit PCB. They are also
displayed on the wired remote controller.
● Viewing the LED 1 and 2 (D72 and D75) alarm displays
LED 1 LED 2 Alarm contents
Alarm display
Alternating
( : Blinking)
LED 1 blinks M times, then LED 2 blinks N times. The cycle then repeats.
M = 2: P alarm 3: H alarm 4: E alarm 5: F alarm 6: L alarm
N = Alarm No.
Example: LED 1 blinks 2 times, then LED 2 blinks 17 times. The cycle then repeats.
Alarm is “P17”.
Possible cause of malfunction
Serial
communication
errors
Mis-setting
Remote controller is detecting
error signal from indoor unit.
Indoor unit is detecting error signal from remote controller (and system controller). <<E03>>
Indoor unit is detecting error
signal from main outdoor unit.
Improper setting of indoor unit or
remote controller.
During auto. address setting,
number of connected units does
not correspond to number set.
When turning on the power
supply, number of connected
units does not correspond to
number set.
(Except R.C. address is “0”.)
Indoor unit communication error
of group control wiring.
Improper setting. This alarm message shows when an indoor unit for multiple-use
Alarm
message
Error in receiving serial communication signal.
(Signal from main indoor unit in case of group control)
Ex: Auto address is not completed.
Error in transmitting serial communication signal. <E02>
Error in receiving serial communication signal.
When turning on the power supply, the number of connected indoor units
does not correspond to the number set. (Except R.C. address is “0”.)
Error of the main outdoor unit in receiving serial communication signal
from the indoor unit.
Indoor unit address setting is duplicated. E08
Remote control address connector (RCU. ADR) is duplicated.
(Duplication of main remote controller)
Starting auto. address setting is prohibited.
This alarm message shows that the auto address connector CN100 is
shorted while other RC line is executing auto address operation.
Error in auto. address setting. (Number of connected indoor units is less
than the number set.)
Error in auto. address setting. (Number of connected indoor units is more
than the number set.)
No indoor unit is connected during auto. address setting. E20
Main outdoor unit is detecting error signal from sub outdoor unit. E24
Error of outdoor unit address setting. E25
The number of connected main and sub outdoor units do not correspond
to the number set at main outdoor unit PCB.
Error of sub outdoor unit in receiving serial communication signal from
main outdoor unit.
Error of main indoor unit in receiving serial communication signal from
sub indoor units.
is not connected to the outdoor unit.
Duplication of main indoor unit address setting in group control. <L03>
Duplication of outdoor R.C. address setting. L04
There are 2 or more indoor unit
controllers that have operation mode
priority in refrigerant circuit.
Group control wiring is connected to individual control indoor unit. L07
Indoor unit address is not set. L08
Capacity code of indoor unit is not set. <<L09>>
Capacity code of outdoor unit is not set. L10
Mis-match connection of outdoor units that have different kinds of
refrigerant.
Priority set remote controller L05
Non-priority set remote controller L06
<E01>
E04
<E06>
<<E09>>
E12
E15
E16
E26
E29
E18
L02
L17
Continued
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Possible cause of malfunction
Activation of
protective device
Protective device in indoor unit
is activated.
Thermal protector in indoor unit fan motor is activated. <<P01>>
Improper wiring connections of ceiling panel. <<P09>>
Alarm
message
Float switch is activated. <<P10>>
O
2 sensor (detects low oxygen level) activated P14
Protective device in outdoor unit
is activated.
Incorrect discharge temperature. (Comp. No. 1) P03
High pressure switch or over-load relay is activated.
Power supply voltage is unusual. (The voltage is less than 160 V
P04
between L1 and L2 phase.)
Negative (defective) phase. P05
Compressor running failure resulting from missing phase in the
compressor wiring, etc. (Start failure not caused by IPM or no gas.)
P16
Incorrect discharge temperature. (Comp. No. 2) P17
Outdoor unit fan motor is unusual. P22
Overcurrent at time of compressor runs more than 80Hz (DCCT
secondary current or ACCT primary current is detected at a time other
P26
than when IPM has tripped.)
IPM trip (IPM current or temperature) H31
Inverter for compressor is unusual. (DC compressor does not operate.) P29
Thermistor fault Indoor thermistor is either
openor damaged.
Indoor coil temp. sensor (E1) <<F01>>
Indoor coil temp. sensor (E2) <<F02>>
Indoor coil temp. sensor (E3) <<F03>>
Indoor suction air (room) temp. sensor (TA) <<F10>>
Indoor discharge air temp. sensor (BL) <<F11>>
Outdoor thermistor is either
open or damaged.
Comp. No. 1 discharge gas temp. sensor (DISCH1) F04
Comp. No. 2 discharge gas temp. sensor (DISCH2) F05
Outdoor No. 1 coil gas temp. sensor (EXG1) F06
Outdoor No. 1 coil liquid temp. sensor (EXL1) F07
Outdoor air temp. sensor (AIR TEMP) F08
Compressor intake port temperature sensor (SCT) F12
High pressure sensor. F16
Low-pressure sensor failure F17
Outdoor No. 2 coil gas temp. sensor (EXG2) F23
Outdoor No. 2 coil liquid temp. sensor (EXL2) F24
EEPROM on indoor unit P.C.B. failure F29
Protective device
for compressor
is activated
Protective device for compressor
No. 1 is activated.
Protective device for compressor
No. 2 is activated.
EEPROM on the main or sub outdoor unit PCB has failed. F31
Current is not detected when comp. No. 1 is ON. H03
Discharge gas temperature of the comp. No. 1 is not detected.
Temp. sensor is not seated at the sensor holder.
H05
Compressor No. 2 current trouble (overcurrent) H11
Compressor No. 2 current trouble (locked) H12
Compressor No. 2 CT sensor disconnected or short circuit H13
Compressor No. 2 discharge temp. sensor disconnected H15
Low pressure switch is activated. H06
Oil sensor fault.
(Disconnection, etc.)
Comp. No. 1 oil sensor H08
Comp. No. 2 oil sensor H27
Continued
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Alarm messages displayed on system controller
Serial
communication
errors
Mis-setting
Activation of
protective device
Error in transmitting serial
communication signal
Error in receiving serial
communication signal
Protective device of sub indoor
unit in group control is activated.
Indoor or main outdoor unit is not operating correctly.
Mis-wiring of control wiring between indoor unit, main outdoor unit and
system controller.
Indoor or main outdoor unit is not operating correctly.
Mis-wiring of control wiring between indoor unit, main outdoor unit and
system controller.
CN1 is not connected properly.
When using wireless remote controller or system controller, in order to
check the alarm message in detail, connect wired remote controller to
indoor unit temporarily.
NOTE
1. Alarm messages in << >> do not affect other indoor unit operations.
2. Alarm messages in < > sometimes affect other indoor unit operations depending on the fault.
C05
C06
P30
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DC0811-21111
Printed in Japan
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