Panasonic U-72ME2U94 User manual

INSTALLATION INSTRUCTIONS
Air Conditioner
This air conditioner uses the refrigerant R410A.
NOTE External diameter of service port R410A: 5/16" (7.94mm)
Model No.
Outdoor Units
Type Outdoor Unit Type Nominal Capacity
ME2 2WAY VRF System
72 96 120 144
U-72ME2U9 U-96ME2U9 U-120ME2U9 U-144ME2U9
U-72ME2U94 U-96ME2U94 U-120ME2U94 U-144ME2U94
• To be connecting Indoor Unit
Indoor Units
Type Indoor Unit Type Nominal Capacity
7 9 12 15 18 24 36 48 54
U2 4-Way Cassette
36" × 36"
S-07MU2U6 S-09MU2U6 S-12MU2U6 S-24MU2U6 S-36MU2U6
Y2 4-Way Cassette
24" × 24"
S-07MY2U6 S-09MY2U6 S-12MY2U6 S-18MY2U6
D1 1-Way Cassette S-07MD1U6 S-09MD1U6 S-12MD1U6
F2 Concealed Duct
- Medium Static
S-07MF2U6 S-09MF2U6 S-12MF2U6 S-15MF2U6 S-18MF2U6 S-24MF2U6 S-36MF2U6 S-48MF2U6 S-54MF2U6
M2 Concealed Duct
- Low Static
S-07MM2U6 S-09MM2U6 S-12MM2U6 S-15MM2U6 S-18MM2U6
E1 Concealed Duct
- High Static
S-36ME1U6 S-48ME1U6
T2 Ceiling S-12MT2U6 S-18MT2U6 S-24MT2U6
K2 Wall Mounted S-07MK2U6 S-09MK2U6 S-12MK2U6 S-18MK2U6 S-24MK2U6
P1 Floor Standing S-07MP1U6 S-09MP1U6 S-12MP1U6 S-15MP1U6 S-18MP1U6 S-24MP1U6
R1 Concealed Floor
Standing
S-07MR1U6 S-09MR1U6 S-12MR1U6 S-15MR1U6 S-18MR1U6 S-24MR1U6
Read through the Installation Instructions before you proceed with the installation.
In particular, you will need to read under the “IMPORTANT!” section at the top of the page.
85464369760022
CV6231977845
ACXF60-18511
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IMPORTANT!
Please Read Before Starting
This air conditioning system meets strict safety and
operating standards. As the installer or service person, it is
an important part of your job to install or service the
system so it operates safely and efficiently.
For safe installation and trouble-free operation, you
must:
● Carefully read this instruction booklet before beginning.
● Follow each installation or repair step exactly as shown.
● This air conditioner shall be installed in accordance with
National Wiring Regulations.
● Pay close attention to all warning and caution notices
given in this manual.
WARNING
WARNING
This symbol refers to a hazard or
unsafe practice which can result
in severe personal injury or death.
WARNING
CAUTION
This symbol refers to a hazard or
unsafe practice which can result
in personal injury or product or
property damage.
If Necessary, Get Help
These instructions are all you need for most installation
sites and maintenance conditions. If you require help for a
special problem, contact our sales/service outlet or your
certified dealer for additional instructions.
In Case of Improper Installation
The manufacturer shall in no way be responsible for
improper installation or maintenance service, including
failure to follow the instructions in this document.
SPECIAL PRECAUTIONS
WARNING
WARNING
When Wiring
ELECTRICAL SHOCK CAN CAUSE
SEVERE PERSONAL INJURY OR DEATH.
ONLY A QUALIFIED, EXPERIENCED
ELECTRICIAN SHOULD ATTEMPT TO
WIRE THIS SYSTEM.
• 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 over-
heating at connection points and a possible re hazard.
• To prevent possible hazards from insulation failure,
the unit must be grounded.
• This equipment is strongly recommended to be installed
with Earth Leakage Circuit Breaker (ELCB) or Residual
Current Device (RCD). Otherwise, it may cause electrical
shock and re in case of equipment breakdown or
insulation breakdown.
When Transporting
Be careful when picking up and moving the indoor and
outdoor units. Get a partner to help, and bend your knees
when lifting to reduce strain on your back. Sharp edges or
thin aluminum fins on the air conditioner can cut your
fingers.
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 floors.
WARNING
CAUTION
Keep the fire alarm and the air
outlet at least 5 ft. (1.5 m) away
from the unit.
…In Moist or Uneven Locations
Use a raised concrete pad or concrete blocks to provide a
solid, level foundation for the outdoor unit. This prevents
water damage and abnormal vibration.
…In an Area with High Winds
Securely anchor the outdoor unit down with bolts and a
metal frame. Provide a suitable air baf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.
When Connecting Refrigerant Tubing
• Pay particular attention to refrigerant leakages.
• Ventilate the room immediately, in the event that is
refrigerant gas leaks during the installation. Be careful not
to allow contact of the refrigerant gas with a flame as this
will cause the generation of toxic gas.
• Keep all tubing runs as short as possible.
• Apply refrigerant lubricant to the matching surfaces of the
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.
WARNING
WARNING
• When performing piping work, do not mix air
except for specified refrigerant (R410A) in
refrigeration cycle. It causes capacity down, and
risk of explosion and injury due to high tension
inside the refrigerant cycle.
• If the refrigerant comes in contact with a ame,
it produces a toxic gas.
• Do not add or replace refrigerant other than
specied type. It may cause product damage,
burst and injury, etc.
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• 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.
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 fingers and clothing away from any moving
parts.
• Clean up the site after you nish, remembering to
check that no metal scraps or bits of wiring have been
left inside the unit .
WARNING
WARNING
• This product must not be modied or
disassembled under any circumstances.
Modied or disassembled unit may cause re,
electric shock or injury.
• 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.
WARNING
CAUTION
• Do not touch the air inlet or the sharp
aluminum fins of the outdoor unit.You
may get injured.
• Ventilate any enclosed areas when installing or
testing the refrigeration system. Leaked
refrigerant gas, on contact with re or heat, can
produce dangerously toxic gas.
• Con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 toxic gas.
Others
WARNING
CAUTION
• Do not sit or step on the unit, you may
fall down accidentally.
• Do not touch the air inlet or the sharp
aluminum fins of the outdoor unit.
You may get injured.
• 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 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 dene
safeguards related to the use of refrigerants, all of which
dene a Refrigerant Concentration Level (RCL) of 400 oz
(11.3 kg) per 1,000 ft3(28.3 m3) for R410A refrigerant.
For additional guidance and precautions related to
refrigerant safety, please refer to the following documents:
International Mechanical Code 2012 (IMC-2012)
(or more recently revised)
ASHRAE 15
ASHRAE 34
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Precautions for Installation Using New Refrigerant
1. Care regarding tubing
1-1. Process tubing
●Material: Use seamless phosphorous deoxidized copper tube for refrigeration. Wall thickness shall comply with the
applicable legislation. The minimal wall thickness must be in accordance with the table below.
●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.
CAUTION
CAUTION
Use sufficient care in handling the tubing. Seal the tubing ends with caps or tape to
prevent dirt, moisture, or other foreign substances from entering.
These substances can result in system malfunction.
Material: O Material: O
Outer diameter Wall thickness Outer diameter Wall thickness
1/4" (6.35) 0.025 (0.635) 7/8" (22.22) 0.045 (1.143)
3/8" (9.52) 0.030 (0.762) 1-1/8" (28.58) 0.050 (1.27)
1/2" (12.7) 0.035 (0.889) 1-3/8" (34.92) 0.055 (1.397)
5/8" (15.88) 0.040 (1.016) 1-5/8" (41.28) 0.060 (1.524)
3/4" (19.05) 0.042 (1.0668) 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.
Item New
tools?
R407C tools
compatible
with R410A?
Remarks
Manifold gauge Yes No Types of refrigerant, refrigerating machine oil, and
pressure gauge are different.
Charge hose Yes No To resist higher pressure, material must be changed.
Vacuum pump Yes Yes
Use a conventional vacuum pump if it is equipped with
a check valve. If it has no check valve, purchase and
attach a vacuum pump adapter.
Leak detector Yes No
Leak detectors for CFC and HCFC that react to chlorine
do not function because R410A contains no chlorine.
Leak detector for HFC134a can be used for R410A.
Flaring oil Yes No
For systems that use R22, apply mineral oil (Suniso
oil) to the flare nuts on the tubing to prevent refrigerant
leakage. For machines that use R407C or R410A, apply
synthetic oil (ether oil) to the flare nuts.
* Using tools for R22 and R407C and new tools for R410A together can cause defects.
Manifold gauge
Vacuum pump
Outlet
Inlet
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3-2. Use R410A exclusive cylinder only.
Single-outlet valve
(with siphon tube)
Liquid refrigerant should be recharged
with the cylinder standing on end as
shown.
New refrigerant R410A cannot be used for
earlier models
1. Compressor specifications are different.
If recharging a R22 or R407C compressor with
R410A, durability will significantly decrease since
some of the materials used for compressor parts are
different.
2. Existing tubing cannot be used (especially R22).
Completely cleaning out residual refrigerating
machine oil is impossible, even by flushing.
3. Refrigerating machine oil differs (R22).
Since R22 refrigerating machine oil is mineral oil, it
does not dissolve in R410A. Therefore, refrigerating
machine oil discharged from the compressor can
cause compressor damage.
R22 refrigerating machine oil Mineral oil (Suniso oil)
R407C refrigerating machine oil Synthetic fluid (ether oil)
R410A refrigerating machine oil Synthetic fluid (ether oil)
Valve
Liquid
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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. Check of Limit Density
1-11. Installing Distribution Joint
1-12. Optional Distribution Joint Kits
1-13. Example of Tubing Size Selection and
Refrigerant Charge Amount
2. SELECTING THE INSTALLATION SITE . . . . . 17
2-1. Outdoor Unit
2-2. Shield for Horizontal Exhaust Discharge
2-3. Installing the Outdoor Unit in Heavy Snow
Areas
2-4. Precautions When Installing in Heavy Snow
Areas
2-5. Dimensions of Wind Ducting
2-6. Dimensions of Snow Ducting
3. HOW TO INSTALL THE OUTDOOR UNIT. . . . 23
3-1. Transporting
3-2. Installing the Outdoor Unit
3-3. Routing the Tubing
3-4. Prepare the Tubing
3-5. 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
5. HOW TO PROCESS TUBING . . . . . . . . . . . . . 34
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. AIRPURGING......................... 37
nAir Purging with a Vacuum Pump (for Test Run)
Preparation
7. TESTRUN............................ 40
7-1. Preparing for Test Run
7-2. Test Run Procedure
7-3. Main Outdoor Unit PCB Setting
7-4. Function Switches on P.C. Board
7-5. Auto Address Setting
7-6. Setting Test Run Remote Controller
7-7. Caution for Pump Down
7-8. Self-Diagnosis Function Table and Contents of
Alarm Display
CONTENTS
Page Page
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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 keyhole 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.
1-3. 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" (7.94mm).
3. Use insulated copper wire for field wiring. Wire size varies
with the total length of wiring.
See the section
“ 4. ELECTRICAL WIRING” for details.
CAUTION
CAUTION
Check local electrical codes and
regulations before obtaining
wire. Also, check any specified
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
1. GENERAL
This booklet briefly outlines where and how to install the air conditioning system. Please read over the entire set of instructions for
the outdoor unit and make sure all accessory parts listed are with the system before beginning.
Table 1 Outdoor Unit
Part name Figure
Q’ty
U-72ME2U9
U-72ME2U94
(6 ton)
U-96ME2U9
U-96ME2U94
(8 ton)
U-120ME2U9
U-120ME2U94
(10 ton)
U-144ME2U9
U-144ME2U94
(12 ton)
Connection
tubing
Outer
diameter
ø1-1/8"(ø28.58)
Inner
diameter
ø1"(ø25.4)
0011
Operating
Instructions paper 1111
Installation
Instructions paper 1111
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1-5. Tubing Length
Select the installation location so that the length and size of refrigerant tubing are within the allowable range show in the figure below.
NOTE
* Be sure to use special R410A distribution joints (CZ: optional parts) for outdoor unit connections and tubing branches.
Table 1-2 Ranges that Apply to Refrigerant Tubing Lengths and to Differences in Installation Heights
unit: ft. (m)
Item Mark Contents Length
Allowable tubing
length
L1 Max. tubing length Actual length 656 (200)*2
Equivalent length 689 (210)*2
L (L2 – L4) Difference between max. length and min.
length from the No.1 distribution joint 164 (50)*4
LM Max. length of main tubing (at maximum size)
- *3
1, 2~ 64 Max. length of each distribution tube 164 (50)*6
L1 + 1 + 2~ 63 + A
+ B + LF + LG + LH
Total max. tubing length including length of each distribution
tube (only liquid tubing) 3280 (1000)
A, B + LO, C + LO Maximum tubing length from outdoor’s 1st distribution
joint to each outdoor unit 33 (10)
Allowable elevation
difference
H1 When outdoor unit is installed higher than indoor unit 164 (50)
When outdoor unit is installed lower than indoor unit 131 (40)
H2 Max. difference between indoor units 49 (15)*5
H3 Max. difference between outdoor units 13 (4)
Allowable length of
joint tubing L3 T-joint tubing (field-supply); Max. tubing length between the first T-joint and solidly welded-shut end point 6.6 (2) L = Length
H = Height
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. (90m) (equivalent length), increase the sizes of the main tubes (LM) by 1 rank for
gas tubes and liquid tubes. (Use a field supply reducer.) (Select the tube size from the table of main tube sizes (Table 1-3) on the
following page (LA table), and from the table of refrigerant tubing sizes (Table 1-9) on the second following page.)
3: If the longest main tubing length (LM) exceeds 164 ft. (50m), increase the main tube size at the portion before 164 ft. (50m) by 1
rank for the gas tubes. (Use a field supply reducer.)
(For the portion that exceeds 164 ft. (50m), set based on the main tube sizes (LA) listed in the table on the following page.)
4: If the tubing length marked "L" (L2 - L4) exceeds 131 ft. (40m), increase the liquid tube and gas tube by 1 rank.
5: If the total distribution tubing length exceeds 1,640ft. (500m), maximum allowable elevation difference (H2) between the indoor
units is calculated by the following formula. Make sure the indoor unit’s actual elevation difference should fall within the figure
calculated as follows.
Unit of account (feet): 49 x (2 - total tubing length(ft.) ÷ 1,640) or Unit of account (meter): 15 x (2 - total tubing length(m) ÷ 500)
6: If any of the tubing length exceeds 98ft. (30m), increase the size of the liquid and gas tubes by 1 rank.
R410A optional distribution joint
CZ-P680PJ1U (for outdoor unit)
CZ-P1350PJ1U (for outdoor unit)
CZ-P160BK1U (for indoor unit)
CZ-P680BK1U (for indoor unit)
CZ-P1350BK1U (for indoor unit)
LO LA
LF
LM
LB
LC
L2
L4
LG
3L
LD
LH
H2
H3
H1
L1
23
1
5
4
AB
C
62 63 64
Balance tubing
(ø1/4" (6.35mm))
Explanation of symbols
No.1 distribution joint for outdoor unit
No.1 distribution joint (for indoor unit)
Distribution joint
(CZ: optional parts)
For
extension
For
extension
Max.1.3 ft (40cm)
Max.1.3 ft (40cm)
Solidly welded shut
(pinch weld)
Ball valve (field supply)
T-joint (field supply)
1. Main tubing length (maximum tubing size) LM = LA + LB …
2. Main distribution tubes LC – LH are selected according to the capacity after the distribution joint.
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 1 – 64 are determined by the connection tubing sizes on the indoor units.
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1-6. Tubing Size
Table 1-3 Main Tubing Size (LA)
Between No.1 distribution joint for outdoor unit and No.1 distribution joint (for indoor unit) Unit: in. (mm)
BTU/h
(kW)
72,000
(21.1)
96,000
(28.1)
120,000
(35.2)
144,000
(42.2)
168,000
(49.2)
192,000
(56.3)
216,000
(63.3)
240,000
(70.3)
264,000
(77.4)
288,000
(84.4)
312,000
(91.4)
336,000
(98.4)
360,000
(105.5)
Total system
tonnage 6 8 10 12 14 16 18 20 22 24 26 28 30
Gas tubing ø3/4"
(ø19.05)
ø7/8"
(ø22.22)
ø1-1/8"
(ø28.58)
ø1-3/8"
(ø34.92)
ø1-5/8"
(ø41.28)
Liquid tubing ø3/8"
(ø9.52)
ø1/2"
(ø12.7)
ø5/8"
(ø15.88)
ø3/4"
(ø19.05)
*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 three ranks higher.
*2: The balance tube (outdoor unit tube) diameter is ø1/4" (6.35mm).
*3: Type 1 tubing should be used for the refrigerant tubes.
nSize 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...) Unit: in. (mm)
Total capacity
after distribution
Below BTU/h (kW) 24,200
(7.09)
54,600
(16.0)
76,800
(22.5)
102,400
(30.0)
143,300
(42.0)
178,800
(52.4)
238,900
(70.0)
340,000
(99.6) –
Over BTU/h (kW) –24,200
(7.09)
54,600
(16.0)
76,800
(22.5)
102,400
(30.0)
143,300
(42.0)
178,800
(52.4)
238,900
(70.0)
340,000
(99.6)
Tubing size
Gas tubing ø1/2"
(ø12.7)
ø5/8"
(ø15.88)
ø3/4"
(ø19.05)
ø7/8"
(ø22.22)
ø1-1/8"
(ø28.58)
ø1-1/8"
(ø28.58)
ø1-1/8"
(ø28.58)
ø1-3/8"
(ø34.92)
ø1-5/8"
(ø41.28)
Liquid tubing ø3/8"
(ø9.52)
ø3/8"
(ø9.52)
ø3/8"
(ø9.52)
ø3/8"
(ø9.52)
ø1/2"
(ø12.7)
ø1/2"
(ø12.7)
ø5/8"
(ø15.88)
ø3/4"
(ø19.05)
ø3/4"
(ø19.05)
Note: In case the total capacity of connected indoor units exceeds the total capacity of the outdoor units, select the main tubing size
for the total capacity of the outdoor units.
Table 1-5 Outdoor Unit Tubing Connection Size ( A –C) Unit: in. (mm)
BTU/h
(kW)
72,000
(21.1)
96,000
(28.1)
120,000
(35.2)
144,000
(42.2)
Gas tubing
ø3/4"
(ø19.05)
ø7/8"
(ø22.22)
ø1-1/8"
(ø28.58)
Brazing connection
Liquid tubing ø3/8" (ø9.52) ø3/8" (ø9.52) ø1/2" (ø12.7)
Flare connection
Balance tubing ø1/4" (ø6.35)
Flare connection
Table 1-6 Refrigerant Charge Amount at Shipment (for outdoor unit)
BTU/h (kW) 72,000 (21.1) 96,000 (28.1) 120,000 (35.2) 144,000 (42.2)
Initial amount oz (g)321 (9,100) 363 (10,300) 300 (8,500) 416 (11,800)
Table 1-7 Indoor Unit Tubing Connection Size Unit: in. (mm)
Indoor unit type 7 9 12 15 18 24 36 48 54
Gas tubing ø1/2" (ø12.7) ø5/8" (ø15.88)
Liquid tubing ø1/4" (ø6.35) ø3/8" (ø9.52)
ex.) type72
Balance
tube
Liquid tube Gas tube
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10
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 Unit: ft. (m)
Gas tubing size (in. (mm)) 1/2"
(12.7)
5/8"
(15.88)
3/4"
(19.05)
7/8"
(22.22)
1-1/8"
(28.58)
1-3/8"
(34.92)
1-5/8"
(41.28)
90° elbow 1
(0.30)
1.1
(0.35)
1.4
(0.42)
1.6
(0.48)
1.9
(0.57)
2.5
(0.76)
2.8
(0.85)
45° elbow 0.8
(0.23)
0.9
(0.26)
1
(0.32)
1.2
(0.36)
1.4
(0.43)
1.8
(0.55)
2.0
(0.61)
U-shape tube bent (R2-3/8" – 4" (60 – 100mm)) 3
(0.90)
3.4
(1.05)
4.1
(1.26)
4.7
(1.44)
5.6
(1.71)
7.4
(2.26)
8.4
(2.56)
Trap bend 7.5
(2.30)
9.2
(2.80)
10.5
(3.20)
12.5
(3.80)
15.4
(4.70)
19.2
(5.85)
22.3
(6.80)
Y-branch distribution joint Equivalent length conversion not needed.
Ball valve for service Equivalent length conversion not needed.
Table 1-9 Refrigerant tubing (Existing tubing can be used.)
Tubing size (in. (mm)) * 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.
Material: O Material: O Material: O
Outer diameter Wall thickness Outer diameter Wall thickness Outer diameter Wall thickness
1/4" (6.35) 0.025 (0.635) 5/8" (15.88) 0.040 (1.016) 1-1/8" (28.58) 0.050 (1.27)
3/8" (9.52) 0.030 (0.762) 3/4" (19.05) 0.042 (1.0668) 1-3/8" (34.92) 0.055 (1.397)
1/2" (12.7) 0.035 (0.889) 7/8" (22.22) 0.045 (1.143) 1-5/8" (41.28) 0.060 (1.524)
1-8. Additional Refrigerant Charge
Additional refrigerant charge amount is calculated from the liquid tubing total length, combination number of outdoor unit and
refrigerant amount according to all indoor unit cooling capacity.
Required amount of additional refrigerant charge
= [(Necessary amount of additional refrigerant charge per ft. (m) of each size of liquid tube x its tube length) + (...) + (...)]
+ [Necessary amount of additional refrigerant charge per outdoor unit]
+ [Necessary amount of additional refrigerant charge for all indoor unit cooling capacity]
* Always charge accurately using a scale for weighing.
Table 1-10-1 Necessary Amount of Additional Refrigerant Charge Per ft. (or per meter), According to Liquid Tubing Size
Liquid tubing size inch ø1/4" ø3/8" ø1/2" ø5/8" ø3/4" ø7/8"
(mm) (ø6.35) (ø9.52) (ø12.7) (ø15.88) (ø19.05) (ø22.22)
Additional amount oz/ft. 0.279 0.602 1.38 1.99 2.78 3.93
(g/m) (26) (56) (128) (185) (259) (366)
Table 1-10-2 Necessary Amount of Additional Refrigerant Charge Per Outdoor Unit
Further charge a certain amount listed below in addition to the amount of refrigerant charge.
Combination number of outdoor unit 123
Additional amount oz (g)70.5 (2,000) 141.0 (4,000) 212 (6,000)
Necessary Amount of Additional Refrigerant Charge for All Indoor Unit Cooling Capacity
Charge a refrigerant amount calculated in the following formula according to the total amount of indoor unit cooling capacity.
Additional refrigerant amount when cooling capacity is BTU/h = Cooling capacity (BTU/h) x 1.034 x 0.001 + 10.6 (oz)
or Additional refrigerant amount when cooling capacity is kW = Cooling capacity (kW) x 1000 x 0.1 + 300 (g)
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