Panasonic U-96MF1U9, U-96MF1U9E, U-72MF1U9, U-72MF1U9E User Manual

U-72MF1U9

Order No. TD831158-11CE

3WAY VRF System

U-72MF1U9E

* U-96MF1U9 U-96MF1U9E

Model No. Outdoor Unit

Model Name

Refrigerant R410A is used in the outdoor units. * Salt-Air Damage Resistant Specifications.

Indoor Units

Class 24 36 48 54

4-Way Cassette

4-Way Cassette 60×60

U-72MF1U9 U-72MF1U9E* U-96MF1U9E*

7 9 12 15 18

9672Class

U-96MF1U9

S-12MY1U6 S-18MY1U6

Section

S-24MU1U6 S-36MU1U6S-12MU1U6 S-18MU1U6

1-Way Cassette

Low Silhouette Ducted

Slim Low Static Ducted

High Static Pressure

Ducted

Ceiling

Wall Mounted

Floor Standing

Concealed Floor

Standing

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

85464869258002

S-07MD1U6 S-09MD1U6 S-12MD1U6

S-07MF1U6 S-09MF1U6 S-12MF1U6 S-15MF1U6 S-18MF1U6

S-07MM1U6 S-09MM1U6 S-12MM1U6

S-12MT1U6 S-18MT1U6 S-24MT1U6

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

S-07MP1U6 S-09MP1U6 S-12MP1U6 S-15MP1U6 S-18MP1U6 S-24MP1U6

S-07MR1U6 S-09MR1U6 S-12MR1U6 S-15MR1U6 S-18MR1U6 S-24MR1U6

S-15MM1U6 S-18MM1U6

S-18MK1U6

S-19MS1U6**S-24MK1U6

S-24MF1U6

REFERENCE NO.

S-36MF1U6 S-48MF1U6

S-36ME1U6 S-48ME1U6

TD831158-02

S-54MF1U6

IMPORTANT! Please Read Before Starting

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

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

Carefully read this instruction booklet before beginning. Follow each installation or repair step exactly as shown. Observe all local, state, and national electrical codes. Pay close attention to all warning and caution notices

given in this manual.

This symbol refers to a hazard or

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 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

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 fire 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 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.

Keep the fire 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 baffle.

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

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

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 flame as this will cause the generation of poisonous gas.

Keep all tubing runs as short as possible.• Use the flare method for connecting tubing.• Apply refrigerant lubricant to the matching surfaces of •

the flare and union tubes before connecting them, then tighten the nut with a torque wrench for a leak-free connection.

Check carefully for leaks before starting the test run.•

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 fire. Do not add or replace refrigerant •

other than specified type. It may cause product damage, burst and injury etc.

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 finish, remembering to check • that no metal scraps or bits of wiring have been left inside the unit being serviced.

WAR NI NG

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

Do not touch the air inlet or the

• sharp aluminum fins of the outdoor unit. You may get injured. Ventilate any enclosed areas when • installing or testing the refrigeration system. Escaped refrigerant gas, on contact with fire or heat, can produce dangerously toxic gas.

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

Do not touch the air inlet or the

• sharp aluminum fins of the outdoor unit. You may get injured. Do not sit or step on the unit, • you may fall down accidentally.

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

Check of Density Limit

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

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

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

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

Precautions for Installation Using New Refrigerant

1. Care regarding tubing

1-1. Process tubing

Material: Use C1220 phosphorous deoxidized copper specified in JIS H3300 “Copper and Copper Alloy Seamless Pipes and Tubes.” 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 sufficient care in handling the tubing. Seal the tubing ends with caps or tape to

Copper tube

CAUTION

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

Outer diameter

Wall thickness

prevent dirt, moisture, or other foreign substances from entering. These substances can result in system malfunction.

Unit: in. (mm)

OMaterial

over 5/128 (1.0)

Unit: in. (mm)

1/2 H, H

7/8 (22.22) 1-1/8 (28.58) 1-3/8 (34.92) 1-5/8 (41.28)

5/128 (1.0) 5/128 (1.0) 3/64 (1.1) over

3/64 (1.20)

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. nce decreases when gas leaks, collect the remaining

Since refrigerant composition changes and performa 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

Charge hose Yes

Vacuum pump Use a conventional vacuum pump if it is equipped

Leak detector Leak detectors for CFC and HCFC that

Flaring oil For systems that use R22, apply mineral oil (Suniso oil)

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

compatible

tool?

with R410A?

Yes

Yes No

Yes

oil, and pressure gauge are different.

To resist higher pressure, material must be changed.

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

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

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

iii

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.

Val ve

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)

Section 1: OUTLINE OF 3WAY VRF SYSTEM ......................................................................

Line-up ............................................................................................................

1. 1-2

Features of 3WAY VRF SYSTEM ....................................................................

2. 1-4

Salt-Air Damage Resistant Specifications .......................................................

3. 1-7

Section 2: DESIGN OF 3WAY VRF SYSTEM ........................................................................

Model Selecting and Capacity Calculator .......................................................

1. 2-2

System Design .............................................................................................

2. 2-18

3. 2-24

Electrical Wiring ............................................................................................

4. 2-32

Installation Instructions .................................................................................

5. 2-40HOW TO PROCESS TUBING ......................................................................

6. 2-44AIR PURGING ..............................................................................................

7. 2-47Optional Parts ...............................................................................................

Section 3: Control of 3WAY VRF SYSTEM ...........................................................................

Main Operating Functions

1. Wireless Remote Controller

2. Timer Remote Controller

3. Simplified Remote Controller

4. System Controller

5. Schedule Timer

6. Intelligent Controller (CZ-256ESMC1U)

7. Communication Adaptor (CZ-CFUNC1U)

8. Remote Sensor

9. LonWorks Interface (CZ-CLNC1U)

10.

Refer to the 2WAY VRF SYSTEM TECHNICAL DATA (TD831157)

Section 4: 3WAY VRF SYSTEM UNIT SPECIFICATIONS .....................................................

Outdoor Unit ..................................................................................................

4-Way Cassette Type (U1 Type)

4-Way Cassette 60×60 Type (Y1 Type)

1-Way Cassette Type (D1 Type)

Low Silhouette Ducted Type (F1 Type)

Slim Low Static Ducted Type (M1 Type)

High Static Pressure Ducted Type (E1 Type)

Ceiling Type (T1 Type)

Wall Mounted Type (K1 Type)

10.

Floor Standing Type (P1 Type)

11. Concealed Floor Standing Type (R1 Type)

12. Intaking Fresh Air of 4-Way Casstte Type and Slim Low Static Ducted Type

Refer to the 2WAY VRF SYSTEM TECHNICAL DATA (TD831157)

Section 5: TEST RUN .............................................................................................................

Section 6: ELECTRICAL DATA ..............................................................................................

Section 7: PCB AND FUNCTIONS ........................................................................................

Section 8: CAPACITY TABLE ................................................................................................

1. 5-2

Preparing for Test Run ....................................................................................

2. 5-3

Test Run Procedure ........................................................................................

3. 5-4

Main Outdoor Unit PCB Setting ......................................................................

4. 5-6

Auto Address Setting ......................................................................................

5. 5-12

Remote Controller Test Run Settings ...........................................................

6. 5-12

Caution for Pump Down ................................................................................

7. 5-13

Meaning of Alarm Messages ........................................................................

1. 6-2

Outdoor Unit ...................................................................................................

Indoor Unit

Refer to the 2WAY VRF SYSTEM TECHNICAL DATA (TD831157)

1. 7-2

Outdoor Unit Control PCB ...............................................................................

Indoor Unit Control PCB Switches and Functions

Refer to the 2WAY VRF SYSTEM TECHNICAL DATA (TD831157)

1. 8-2

Capacity Ratio of Outdoor Unit ......................................................................

2. 8-10

Cooling Capacity of Indoor Unit ....................................................................

1-1

2-1

3-1

4-1

4-3

5-1

6-1

7-1

8-1

Outline of 3WAY VRF SYSTEM

Contents

1. OUTLINE OF 3WAY VRF SYSTEM

1. Line-up ............................................................................................................................... 1-2

. Features of 3WAY VRF SYSTEM .......................................................................................

3. Salt-Air Damage Resistant Specifications .......................................................................

1-4

1-7

1 - 1

Outline of 3WAY VRF SYSTEM

1. Line-up

Indoor units

Type 9 191815127 3624 48 54

4-Way Cassette

(U1 Type)

4-Way Cassette

60 X 60 (Y1 Type)

1-Way Cassette

(D1 Type)

Low Silhouette Ducted (F1 Type)

S-07MD1U6 S-09MD1U6 S-12MD1U6

S-07MF1U6 S-12MF1U6 S-15MF1U6 S-18MF1U6S-09MF1U6 S-24MF1U6

S-12MU1U6 S-18MU1U6

S-12MY1U6 S-18MY1U6

S-24MU1U6 S-36MU1U6

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

Slim Low Static Ducted (M1 Type)

High Static Pressure Ducted (E1 Type)

Ceiling

(T1 Type)

Wall Mounted

(K1 Type)

Floor Standing

(P1 Type)

Concealed Floor Standing (R1 Type)

S-07MM1U6 S-12MM1U6 S-15MM1U6 S-18MM1U6S-09MM1U6

S-18MT1U6S-12MT1U6 S-24MT1U6

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

S-07MP1U6 S-12MP1U6 S-15MP1U6 S-18MP1U6S-09MP1U6 S-24MP1U6

S-07MR1U6 S-12MR1U6 S-15MR1U6 S-18MR1U6S-09MR1U6 S-24MR1U6

S-19MS1U6

S-24MK1U6S-18MK1U6

S-36ME1U6

S-48ME1U6

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

1 - 2

1. Line-up

Outdoor units

Type

Capacity: BTU/h (kW)

Cooling / Heating

U-72MF1U9 U-72MF1U9E

Outline of 3WAY VRF SYSTEM

72,000 (21.1)

/ 81,000 (23.7)

Air intake

Air

intake

37-1/2

Outdoor Unit

Type

Capacity: BTU/h (kW)

Cooling / Heating

U-96MF1U9 U-96MF1U9E

Air intake

(Ceiling panel dimensions)

Air discharge

(Maximum dimensions)

82-9/16

unit : in.

96,000 (28.1)

/ 108,000 (31.6)

Air intake

Air

intake

37-1/2

Air intake

Outdoor Unit

Outdoor unit model name ended with letters "U9E". Refer to the Section 1 "3. Salt-Air Damage Resistant Specifications".

1 - 3

(Ceiling panel dimensions)

82-9/16

Air discharge

(Maximum dimensions)

unit : in.

2. Features of 3WAY VRF SYSTEM

2-1. Outline of 3WAY VRF SYSTEM

System example

CONCENTRATION

Outline of 3WAY VRF SYSTEM

Since all pipings are concentrated into one pipe shaft, you can minimize piping space and construction labor

CONNECTION

System limitations

Maximum number of combined outdoor units Maximum tonnage of combined outdoor units Maximum number of connectable indoor units Indoor/outdoor unit capacity ratio Maximum actual piping length Maximum level difference (when outdoor unit is lower) Maximum total piping length

* Panasonic makes it possible to link outdoor

unit together for a large capacity (24-Ton).

If indoor/outdoor units need servicing, a ball valve (field supply) cuts off non-operational units to let other units stay running.

3 24-Ton 40 50~130% 492ft 164 (131) ft 984 ft

Solenoid valve kit

Indoor unit

ADDITION

If your indoor capacity load changes in the future, it’s easy to add on both indoor and outdoor units using the same pipings.

If the additional installment of outdoor and indoor units are

expected, the size of refrigerant piping should be decided according to the total capacity after the addition.

Combination of outdoor units

The DC inverter unit can be used independently or in combination.

CAUTION

Total tonnage

Type (ton)

R407C models and R22 models must not be used in combination with each other.

6 8 12 14 18 20 22 24

11 231

12231

1 - 4

2. Features of 3WAY VRF SYSTEM

Dimensions

Outline of 3WAY VRF SYSTEM

6, 8 Ton

Air intake

6-Ton 8-Ton

U-72MF1U9, U-72MF1U9E U-96MF1U9, U-96MF1U9E

Dimensions of unit combinations

* *

Air intake

74 (Ceiling panel dimensions)

(Ceiling panel dimensions)

Air intake

31-1/8

(Installation hole pitch)

(Ceiling panel dimensions)

Top view

12, 14 Ton

(Ceiling panel dimensions)

Air intake

37-1/2

36-1/4

(Installation hole pitch)

(Ceiling panel dimensions)

(Maximum dimensions)

Unit: in.

36-1/4

37-1/2

(Installation hole pitch)

(Ceiling panel dimensions)

(Installation hole pitch)

31-1/8

7-7/8

(Installation hole pitch)

70-1/8

(Installation hole pitch)

Top view

18, 20, 22, 24 Ton

113 (Ceiling panel dimensions)

(Ceiling panel dimensions)

(Installation hole pitch)

109-1/16 (Installation hole pitch)

31-1/8

Top view

31-1/8

(Ceiling panel dimensions)

8/7-78/7-731-1/8

(Installation hole pitch)

31-1/8

(Installation hole pitch)

(Ceiling panel dimensions)

(Maximum dimensions)

Unit: in.

36-1/4

37-1/2

(Installation hole pitch)

(Ceiling panel dimensions)

Unit: in.

(Maximum dimensions)

Outdoor unit model name ended with letters "U9E". Refer to the Section 1 "3. Salt-Air Damage Resistant Specifications".

1 - 5

Outline of 3WAY VRF SYSTEM

2. Features of 3WAY VRF SYSTEM

Capacity control

The compressor combination (DC inverter compressor + constant-speed compressor) allows smooth capacity control from

0.6-Ton to 24-Ton.

Realization of smooth capacity control from 0.6-Ton to 24-Ton

Capacity control is possible smoothly with a DC inverter compressor. The right graph shows the image of the operating combination of compressors in case of 24-Ton system. In actual operation, the combination will be changed by operating condition, operating time amount, priority of compressor and so on.

Comp. HP Unit1(main) Unit2(sub1) Unit3(sub2)

DC comp. 4.0 4.0 4.0

AC comp. 5.0 5.0 5.0

*24 Ton = U-96MF1U9 (U-96MF1U9E) Type x 3

Unit 1

DC1

AC1

Unit 2

DC2

AC2

Unit 3

DC3

AC3

Capacity

(Ton)

In case of 24-Ton system

DC1

DC1 DC2

DC1

DC2

DC3

Example of 3 unit connection

DC2

DC3

AC1

DC2

DC3

AC1

AC2

LOAD

DC2

DC3

AC1

AC2

AC3

---

1 - 6

3. Salt-Air Damage Resistant Speciﬁ cations

Specifications

Relevant Parts Material Standard Specifications

Outline of 3WAY VRF SYSTEM

Salt-Air Damage Resistant

Specifications

Outdoor unit model name ended

with letters "U9E".

Outer box/side plate/ drain pan between the stud

Base frame

Fan guard

Fin Aluminum

Tube Copper No treatment Zinc rich treatment (whole)

Tube plate

Exchanger

Heat

Propeller fan

Fan

Installation frame

Electrical component box

Tapping screws

Hot-dip zinc-coated steel sheet

Hot-dip aluminum-zinc coated steel sheet

Resin (Polypropylene) No treatment

Hot-dip zinc-coated steel sheet

Resin

Aluminum

Hot-dip zinc-coated steel sheet

SUS410

Polyester powder double coating (both sides)( m)40

No treatment

Motor maker's standard spec.Motor

Polyester powder double coating (both sides) m)120(

No treatment

Hexavalent chromium-free coating

Polyester powder double coating (both sides) ( m)120

No treatment

Zinc rich treatment

Zinc rich treatment (whole)

No treatment

Urethane coating

Motor maker's spec. for salt-air damage resistant (urethane coating)

Polyester powder double coating (both sides) 120 m)(

Polyester powder coating( 120 m)

Hexavalent chromium-free coating + urethane coating

(m)30

Stud supplementary bracket

Accumulator Receiver tank

Welded portion Copper tube No treatment Urethane coating

Outer surface Copper tube No treatment Urethane coating

Refrigeration

cycle tube

Fixing bracket

Notes:

1 Consult us before introducing a salt-air damage resistant model as it requires a special treatment. 2 The specifications are subject to change without notice for development. 3 Contact us for the delivery schedule.

Hot-dip zinc-coated steel sheet

Steel Epoxy coating + alkyd coating

Hot-dip zinc-coated steel sheet

No treatment

Polyester powder double coating ( 120 m)

Dessicant coating

Zinc rich double coating + urethane coating m)70(

Polyester powder double coating (both sides) m)80(

m) 30 (PC board --

1 - 7

– MEMO –

1 - 8

Design of 3WAY VRF SYSTEM

Contents

2. DESIGN OF 3WAY VRF SYSTEM

1. Model Selecting and Capacity Calculator ........................................................................2-2

2-21-1. Operating Range .............................................................................................................

2-31-2. Procedure for Selecting Models and Calculating Capacity ...........................................

2-41-3. Tubing Length .................................................................................................................

2-61-4. Tubing Size ......................................................................................................................

2-81-5. Installation Standards ......................................................................................................

2-91-6. Straight Equivalent Length of Joints ...............................................................................

2-101-7. Check of limit density ....................................................................................................

2-11................................................................8-1 Calculation of Actual Capacity of Indoor Unit

2-15................................9-1 Capacity Correction Graph According to Temperature Condition

2-161-10. ...Capacity Correction Graph According to Tubing Length and Elevation Difference

................................................................................................................. 2-182. System Design

2-182-1. System Example............................................................................................................

2-20.......2-2. Example of Tubing Size Selection for Extension and Additional Charge Amount

2-23............................................................................................2-3. Installing Distribution Joint

2-243. Electrical Wiring ..............................................................................................................

2-243-1. General Precautions on Wiring .....................................................................................

Recommended Wire Length and Wire Diameter for Power Supply System ..................

4-5. 2-33Precautions When Installing in Heavy Snow Areas ......................................................

4-6. Dimensions of Wind Ducting

4-7. Dimensions of Snow Ducting

Indoor Unit

Refer to the 2WAY VRF SYSTEM TECHNICAL DATA (TD831157)

Distribution Joint Kits

Solenoid Valve Kit for 3WAY VRF System ......................................................................

.....................................................................................................

2 - 1

2-243-2.

2-253-3. Wiring System Diagrams ...............................................................................................

2-283-4. Important Note When Wiring for Common Type ..........................................................

2-313-5. Important Note When Wiring for Y1 Type ....................................................................

2-324. Installation Instructions ..................................................................................................

2-32Outdoor Unit ..................................................................................................................

2-324-1. Selecting the Installation Site for Outdoor Unit ............................................................

2-33.....................................................................2-4 Removing Fin Guard for Heat Exchanger

2-33.......................................................................3-4 Shield for Horizontal Exhaust Discharge

2-33.........................................................4-4 Installing the Outdoor Unit in Heavy Snow Areas

2-34Reference diagram for air-discharge chamber (field supply).......................................

2-35Reference diagram for snow-proof ducting (field supply)............................................

2-364-8. Transporting the Outdoor Unit .....................................................................................

2-364-9. Installing the Outdoor Unit ............................................................................................

2-374-10. Remove the Brackets Used for Transport ..................................................................

2-374-11. Routing the Tubing ......................................................................................................

2-384-12. Prepare the Tubing......................................................................................................

2-384-13. Connect the Tubing.....................................................................................................

2-405. HOW TO PROCESS TUBING ..........................................................................................

2-405-1. Connecting the Refrigerant Tubing ..............................................................................

2-415-2. Connecting Tubing Between Indoor and Outdoor Units .............................................

2-425-3. Insulating the Refrigerant Tubing .................................................................................

2-435-4. Taping the Tubes ..........................................................................................................

2-435-5. Finishing the Installation ................................................................................................

2-446. AIR PURGING .................................................................................................................

2-44Air Purging with a Vacuum Pump (for Test Run) Preparation ..................................

2-477. Optional Parts ..................................................................................................................

2-477-1. 2-517-2.

1. Model Selecting and Capacity Calculator

1-1. Operating Range

Heating and Cooling

Design of 3WAY VRF SYSTEM

Outdoor air intake temp. F (WB)

-4 50 59

Operating range

68 77 86

Indoor air intake temp. F (DB)

Cooling

113

104

Heating

Operating range

68 77

Outdoor air intake temp. F (DB)

Indoor air intake temp. F (WB)

Outdoor air intake temp. F (WB)

-4 50

Operating range

68 77 86 95

Indoor air intake temp. F (DB)

2 - 2

Design of 3WAY VRF SYSTEM

1. Model Selecting and Capacity Calculator

1-2. Procedure for Selecting Models and Calculating Capacity

Model Selection Procedure

Select the model and calculate the capacity for each refrigerant system according to the procedure shown below.

Calculation of the indoor air-conditioning load

Calculate the maximum air-conditioning load for each room or zone.

Selection of an air conditioning system

Select the ideal air conditioning system for air conditioning of each room or zone.

Design of the control system

Design a suitable control system for the selected air conditioning system.

Preliminary selection of indoor and outdoor units

Make preliminary selections that are within the allowable range for the system

Check of the tubing length and elevation difference

Check that the length of refrigerant tubing and the elevation difference are within the allowable

ranges.........................................................................................................................................

Calculation of the corrected outdoor unit capacity

Capacity correction coefficient for model................................................................................

Capacity correction coefficient for outdoor temperature conditions...........................

Capacity correction coefficient for tubing length and elevation difference........................

Heating capacity correction coefficient for frosting/defrosting..........................................

Calculation of the corrected capacity for each indoor unit

Capacity correction coefficient for indoor temperature conditions....................................

Capacity distribution ratio based on the tubing length and elevation difference..............

Calculation of the actual capacity for each indoor unit

Calculate the corrected indoor/outdoor capacity ratio, based on the corrected outdoor unit capacity and the total corrected capacity of all indoor units in the same system. Use the result to

calculate the capacity correction coefficient for the indoor units.................................

Multiply the corrected capacity of each indoor unit by the capacity correction coefficient to calcu-

late the actual capacity for each indoor unit...........................................................................

Recheck of the actual capacity for each indoor unit

If the capacity is inadequate, reexamine the unit combinations.

Example 1: Increasing the outdoor unit capacity....................................................................

Example 2: Increasing the indoor unit capacity......................................................................

Increasing the tubing size........................................................................................................

Design of tubing

Create a tubing design which minimizes the amount of additional refrigerant charge as much as

possible...........................................................................................................................

If tubing extension for additional unit is expected in the future, create the tubing design with adequate consideration for this extension. Select the tubing size for the main tube (LA) up to the No. 1 distribution joint based on the rated cooling capacity of the outdoor unit. Select tubing sizes after the distribution point based on the total rated cooling capacity of the connected indoor units. Increasing the tubing size of the wide tubes can reduce the loss of capacity caused by longer tubing lengths. (Only the main wide tube with the largest tube diameter (main tube LA and main tubes after the distribution point that are the same size as LA) can be changed.) In this case, it is

necessary to recalculate the actual indoor unit capacities.....................................................

Calculation of additional refrigerant charge amount

Calculate the additional refrigerant charge from the diameters and lengths of the refrigerant tubing. Even if the wide tubing diameter was increased, determine the additional refrigerant charge

based only on the narrow tubing size.....................................................................................

Check the minimum indoor capacity (limit density) with respect to the amount of refrigerant. If the limit density is exceeded, be sure to install ventilation equipment or take other corrective steps.

Design of electrical wiring capacity

Select a wiring capacity according to the method of power supply.......................................

2 - 3

........

2-4 ~ 2-10

2-4

2-11

2-11, 13, 15

2-11, 14 2-11, 13

2-11, 14 2-11, 14

2-11 ~ 2-15

2-12

2-18 2-19 2-20

2-4 ~ 2-6

2-20

2-21

2-22

2-24

Design of 3WAY VRF SYSTEM

1. Model Selecting and Capacity Calculator

1-3. Tubing Length

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

2. Main distribution tubes LC – LH are selected according to the capacity after the

The outdoor connection main tubing (LO portion) is determined by the total capacity of the

3. outdoor units that are connected to the tube ends.

Main tubing length LM = LA + LB … < 262 ft

distribution joint.

Sizes of indoor unit connection tubing 1 – 40 are determined by the connection tubing sizes on the indoor units.

Balance tubing (ø3/8")

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 and parts.

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

unit connections and tubing branches.

LB LC

Max.1.3 ft

For extension

T-joint tubing (header joint system)

LE L3

Solenoid valve kit

R410A distribution joint CZ-P900PH1U CZ-P224BH1U (for indoor unit) CZ-P680BH1U (for indoor unit) CZ-P1350BH1U

(for outdoor unit)

(for indoor unit)

Table 2-1 Ranges that Apply to Refrigerant Tubing Lengths and to Differences in Installation Heights

Length (ft.)ContentsMarkItem

492

574

131

262ML

984

164

131

6.6

Allowable tubing length

Allowable elevation difference

Allowable length of joint tubing

L = Length, H = Height

L (L2 – L4)

,2...

L1+

A+B

...

+LF+LG+LH

H2 H3

Max. tubing length

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

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

Max. length of each distribution tube

Total max. tubing length including length of each distribution tube (only liquid tubing)

Distance between outdoor units

When outdoor unit is installed higher than indoor unit

When outdoor unit is installed lower than indoor unit Max. difference between indoor units Max. difference between outdoor units

T-joint tubing (field-supply); Max. tubing length between the first T-joint and solidly welded-shut end point

Actual length

Equivalent length

NOTE

The outdoor connection main tubing (LO portion) is determined by the total capacity of the outdoor units that are connected to the tube ends.

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. (field supplied)

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. (field supplied)

(For the portion that exceeds 164 feet, set based on the main tube sizes (LA) listed in the table on the following page.)

4: If the tubing length (LA) is less than 16.4 feet, it is recommended that the suction tube be increased by 1 rank.

2 - 4

1. Model Selecting and Capacity Calculator

Refrigerant Charge Amount at Shipment (for outdoor unit)

(oz)

Additional Refrigerant Charge

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

Amount of Refrigerant Charge Per ft., According to Liquid Tubing Size

(in. (mm))

ø1/4" (ø6.35)

ø3/8" (ø9.52)

ø1/2" (ø12.7)

ø5/8" (ø15.88)

ø3/4" (ø19.05)

ø7/8" (ø22.22)

U-72MF1U9

U-72MF1U9E

416

Liquid tubing size

Amount of refrigerant

charge (oz/ft.)

0.279

0.602

1.38

1.99

2.78

3.93

U-96MF1U9

U-96MF1U9E

416

Required amount of additional refrigerant charge = [(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.

Design of 3WAY VRF SYSTEM

Table 2-1-1 Necessary Amount of Refrigerant Charge Per Outdoor Unit

Further charge a certain amount listed below in addition to the amount of refrigerant charge.

U-72MF1U9

U-72MF1U9E

42 oz/unit

NOTE

If the tubing length (LA) is less than 16.4 feet, it is necessary to add 71 oz/unit of refrigerant in addition to 42 oz.

System Limitations

Max. capacity allowable connected outdoor units 288,000 BTU/h (24-Ton, 84 kW)

*1: Up to 3 units can be connected if the system has been extended.

U-96MF1U9

U-96MF1U9E

42 oz/unit

3Max. No. allowable connected outdoor units

40Max. connectable indoor units

50 – 130 %Max. allowable indoor/outdoor capacity ratio

2 - 5

Design of 3WAY VRF SYSTEM

1. Model Selecting and Capacity Calculator

1-4. Tubing Size

Table 2-2 Main Tubing Size (LA)

BTU/h

(kW)

Total system tonnage

Combined outdoor models

Suction tubing

Discharge tubing

Liquid tubing

72,000

(21.1)

ø3/4"

(ø19.05)

ø5/8"

(ø15.88)

96,000

(28.1)

ø7/8"

(ø22.22)

ø3/4"

(ø19.05)

ø3/8"

(ø9.52)

139,000

(40.7)

U-72MF1U9(E)U-96MF1U9(E)U-72MF1U9(E) U-72MF1U9(E)

ø1/2"

(ø12.7) (ø15.88)

168,000

(49.2)

U-96MF1U9(E) U-72MF1U9(E)

ø1-1/8"

(ø28.58)

ø7/8"

(ø22.22)

203,000

(59.5)

186

U-72MF1U9(E) U-72MF1U9(E) U-72MF1U9(E)

ø5/8"

240,000

(70.3)

U-96MF1U9(E) U-72MF1U9(E) U-72MF1U9(E)

ø1-1/8"

(ø28.58)

264,000

U-96MF1U9(E) U-96MF1U9(E) U-72MF1U9(E)

ø1-3/8"

(ø34.92)

(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 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 2-2 and Table 2-7.) *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.)

(77.4)

ø3/4"

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 2-3 Main Tubing Size After Distribution (LB, LC...)

Total capacity after distribution

Tubing size

Total capacity after distribution

Tubing size

Below BTU/h

Over BTU/h

Suction tubing

Discharge tubing

Liquid tubing

Below BTU/h

Over BTU/h

Suction tubing

Discharge tubing

Liquid tubing

24.200

(ø15.88) (ø19.05) (ø19.05) (ø22.22)

ø1/2" ø5/8" ø5/8" ø3/4"

ø3/8" ø3/8" ø3/8" ø3/8"

258.000

238.900 258.000

ø1-3/8" ø1-3/8" ø1-3/8"

ø1-1/8" ø1-1/8" ø1-1/8"

(ø19.05) (ø19.05) (ø19.05)

54.600

–

24.200

(ø15.88) (ø19.05) (ø22.22)(ø12.70)

334.400

85.300

54.600 ø3/4"ø3/4"ø5/8"

(ø15.88)

–

334.400

(ø34.92)(ø34.92)(ø34.92)

(ø28.58)(ø28.58)(ø28.58)

ø3/4"ø3/4"ø3/4"

102.400

Table 2-4 Outdoor Unit Tubing Connection Size ( A – D )

BTU/h

(kW)

Suction tubing

Discharge tubing

Liquid tubing

Balance tubing

72,000

(21.1)

ø3/4"

(ø19.05)

Brazing connection

ø5/8"

(ø15.88)

Brazing connection

ø3/8" (ø9.52)

Flare connection

ø3/8" (ø9.52)

Flare connection

96,000

(28.1)

ø7/8"

(ø22.22)

ø3/4"

(ø19.05)

ø3/8" (ø9.52)

Unit: in. (mm)

2 - 6

143.300

124.200

(ø28.58)

ø7/8"

ø1/2"

(ø12.70)

85.300

(ø9.52)(ø9.52)(ø9.52)(ø9.52)

124.200

102.400

(ø28.58)

ø3/4"

(ø19.05)

ø1/2"

(ø12.70)

The outdoor unit connection tubing (LO) is

*1:

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.

If the total capacity of the indoor units con-

*2:

nected 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)

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).

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).

162.400

143.300

(ø28.58)

ø7/8" ø7/8" ø1-1/8"

(ø22.22) (ø22.22)

ø1/2"

200.600

162.400 ø1-1/8"ø1-1/8"ø1-1/8"ø1-1/8"ø7/8"

(ø28.58)

(ø15.88)(ø12.70)

Unit: in. (mm)

238.900

200.600 ø1-1/8"

(ø28.58)

ø5/8"ø5/8"

(ø15.88)

1. Model Selecting and Capacity Calculator

Table 2-5 Amount of Refrigerant Charge

Liquid tubing size Amount of refrigerant

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

ø1/4" (ø6.35) 0.279

ø3/8" (ø9.52) 0.602

ø1/2" (ø12.7) 1.38

ø5/8" (ø15.88) 1.99

ø3/4" (ø19.05) 2.78

ø7/8" (ø22.22) 3.93

Design of 3WAY VRF SYSTEM

Table 2-6 Indoor Unit Tubing Connection Size ( 1– 40 )

Indoor unit type

Distribution joint-solenoid valve kit tubing

Solenoid valv kit-Indoor unit tubing connection

*1: For the solenoid valve kits, use type 160 with parallel specifications. Branch the tubing before and after the solenoid valve kits.

Table 2-7 Refrigerant tubing (Existing tubing can be used.)

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)

ø5/8" (ø15.88) t5/128 (t1.0)

ø3/4" (ø19.05)

Suction tubing Discharge tubing Liquid tubing

Gas tubing

Liquid tubing

Material O Material 1/2H • H

over t5/128 (t1.0)

Tubing size (in. (mm))

ø7/8" (ø22.22) t5/128 (t1.0)

ø1-3/8" (ø34.92)

ø1-5/8" (ø41.28)

12 15 18 19 24 36 48 54

ø5/8" (ø15.88)

ø1/2" (ø12.7)

ø3/8" (ø9.52)

ø1/2" (ø12.7)

ø1/4" (ø6.35)

over t3/64 (t1.20)

t3/64 (t1.1)

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)

ø3/8" (ø9.52)

Unit: in. (mm)

2 - 7

1. Model Selecting and Capacity Calculator

1-5. Installation Standards

Relationship between A/C units and refrigerant tubing

Design of 3WAY VRF SYSTEM

Room

Indoor unit

Hallway

Solenoid

valve kit

Liquid

Room

Indoor unit

Gas tube

tube

Solenoid valve kit

Outdoor unit Outdoor unit Indoor unit

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 recom-

mended that the solenoid valve kit be installed inside the corridor ceiling, at a location outside the room.

Hallway

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

56 7.500

If the capacity range is exceeded, use 2 solenoid valves connected in parallel.

4-tube layout 3-tube layout 2-tube layout

Suction tube

Discharge tube

Liquid tube

Solenoid valve kit

54.600

Room

Indoor unit

Suction tube

Discharge tube

Liquid tube

Balance tube

Desirable Undesirable

Room

Indoor unit

Total capacity 19.000

(2) When adding ball valve for outdoor unit

1. Location: Install the ball valve at the main tube of the distribution joint.

Outdoor unit for extension

Ball valve (for extension)

(Planned expansion)

Main tube of distribution joint

Balance tube

Discharge tube

Less than 1.3 ft

Distribution joint

(Suction tube)

Main tube

Liquid tube

To indoor unit

2. Installation requirements

• Be sure to install the ball valve up-grade to prevent the inadvertent flow of oil.

• Install the ball valve at the shortest distance (within 1.3 ft.) from the main tube. If the diameter of the ball valve is smaller than that of the main tube, use a reducer or the like to reduce the size of the tubing at that location.

NOTE

• If the ball valve is installed at the outdoor unit (including extension for outdoor unit), face the service port of the valve toward the outdoor unit side (see above illustration; dotted line) and allow a distance of over 1.6 ft from the outdoor unit. If the ball valve is installed between the indoor unit (including extension for indoor unit) and the main tube, face the ball valve toward the indoor unit side (see above illustration; dotted line).

• Use a field supply ball valve.

2 - 8

Design of 3WAY VRF SYSTEM

1. Model Selecting and Capacity Calculator

1-6. Straight Equivalent Length of Joints

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

Table 2-8 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.)

T r ap bend

Y-branch distr ibution joint Equivalent length conversion not needed.

Ball v alve f or ser vice Equivalent length conversion not needed.

1/2"

(12.7)

0.8 0.9 1

7.5 9.2 10.5 15.4

5/8"

(15.88)

1 1.1 1.4 1.9 2.5 2.8

3 3.4 4.1 5.6 7.4 8.4

3/4"

(19.05)

1.6

1.2

4.7

1-1/8"

(28.58)

1.4

7/8"

(22.22)

12.5 19.2 22.3

1-3/8"

(34.92)

1.8 2.0

Unit: ft.

1-5/8"

(41.28)

2 - 9

1. Model Selecting and Capacity Calculator

Check of limit density

Design of 3WAY VRF SYSTEM

WARNING

1-7. Check of limit density

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

CAUTION

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

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

2 - 10

Design of 3WAY VRF SYSTEM

1. Model Selecting and Capacity Calculator

1-8. Calculation of Actual Capacity of Indoor Unit

Calculating the actual capacity of each indoor unit

Because the capacity of a multi air-conditioner changes according to the temperature conditions, tubing length, elevation difference and other factors, select the correct model after taking into account the various correction values. When selecting The model, calculate the corrected capacities of the outdoor unit and each indoor unit. Use the corrected outdoor unit capacity and the total corrected capacity of all the indoor units to calculate the actual final capacity of each indoor unit.

1. Outdoor unit capacity correction coefficient

Find the outdoor unit capacity correction coefficient for the following items.

(1) Capacity correction for the outdoor unit model

The capacity correction coefficient is 1.00.

(2)

Capacity correction for the outdoor unit temperature conditions Cooling:

Heating:

(3) Capacity correction for the outdoor unit tubing length and elevation difference

From the graph of capacity change characteristics on page 2-14, use the tubing length and elevation difference to find the capacity correction coefficient. The outdoor unit correction coefficient is the value which corresponds to the most demanding indoor unit.

(4) Capacity correction for outdoor unit frosting/defrosting during heating

From the table on page 2-13, find the capacity correction coefficient.

From the graph of capacity characteristics on page 2-13 ( Graph of Outdoor Unit Capacity Characteristics), use the outdoor temperature to find the capacity correction coefficient. From the graph of capacity characteristics on page 2-15, use the outdoor temperature to find the capacity correction coefficient. * Indoor air intake temperature should be set to 68 °FDB.

2. Indoor unit capacity correction coefficients

Find the indoor unit capacity correction coefficient for the following items.

(2) Capacity correction for the indoor unit temperature conditions

From the graph of capacity characteristics on page 2-14 ( Graph of Indoor Unit Capacity Characteristics), use the indoor temperature to find the capacity correction coefficient.

(3) Capacity distribution ratio based on the indoor unit tubing length and elevation difference First, in the same way as for the outdoor unit, use the tubing length and elevation difference for each indoor unit to find the correction coefficient from the graph of capacity change characteristics on page 2-14. Then divide the result by the outdoor unit correction coefficient to find the capacity distribution ratio for each indoor unit.

Capacity distribution ratio for each indoor unit (3) = Correction coefficient for that indoor unit / Correction coefficient for the outdoor unit

3. Calculating the corrected capacities for the outdoor unit and each indoor unit

The corrected capacities for the outdoor unit and each indoor unit are calculated form the formula below.

Outdoor unit corrected cooling capacity (5) = Outdoor unit rated cooling capacity × Correction coefficient for model ((1)

Page 2-11) × Correction coefficient for outdoor temperature conditions ((2) Page 2-13) × Correction coefficient for tubing length and elevation difference ((3) Page 2-14)

* However, if the outdoor unit corrected cooling capacity [5] is greater than 100%, then the outdoor unit corrected cooling

capacity [5] is considered to be 100%.

Corrected cooling capacity of each indoor unit (5) = Rated cooling capacity for that indoor unit × Correction coefficient for indoor temperature conditions at that indoor unit ((2) Page 2-14) × Distribution ratio based on tubing length and elevation difference at that indoor unit ((3) Page 2-14)

However, the corrected cooling capacity of each indoor unit is found as shown below. If (2) < 100% and (2) × (3) > 100%: Corrected cooling capacity for that indoor unit [5] = Rated cooling capacity for that indoor unit If (2) >100%: Corrected cooling capacity for that indoor unit (5) = Rated cooling capacity for that indoor unit × (2)

2 - 11

Design of 3WAY VRF SYSTEM

1. Model Selecting and Capacity Calculator

Outdoor unit corrected heating capacity (5) = Outdoor unit rated heating capacity × Correction coefﬁ cient for model ((1)

Page 2-11) × Correction coefﬁ cient for outdoor temperature conditions ((2) Page 2-15) × Correction coefﬁ cient for tubing length and elevation difference ((3) Page 2-14) × Correction coefﬁ cient for frosting/defrosting ((4) Page

* However, if the outdoor unit corrected heating capacity [5] is greater than 100%, then the outdoor unit corrected heating

capacity is considered to be 100%.

Corrected heating capacity of each indoor unit (5) = Rated heating capacity for that indoor unit × Correction coefﬁ cient for

indoor temperature conditions at that indoor unit ((2) Page 2-14) × Distribution ratio based on tubing length and elevation difference at that indoor unit.

However, the corrected heating capacity of each indoor unit is found as shown below. If (2) < 100% and (2)

100%: Corrected heating capacity for that indoor unit (5) = Rated heating capacity for that indoor unit × (2)

If (2)

* Characteristic graphs are shown on the pages listed above next to each correction item. Find each correction coefﬁ cient

from the appropriate conditions.

× (3) > 100%: Corrected heating capacity for that indoor unit (5) = Rated heating capacity for that indoor unit

2-13)

4. Calculating the actual indoor unit capacity based on the indoor/outdoor corrected capacity ratio

Calculate the actual capacity of each indoor unit from the values (found in (3)) for the corrected outdoor unit capacity and the corrected capacity of each indoor unit.

Corrected indoor/outdoor capacity ratio during cooling (Ruc) = Total corrected cooling capacity of all indoor units in that system / Corrected outdoor unit cooling capacity

If the corrected outdoor unit cooling capacity is greater than or equal to the total corrected unit cooling capacity of all indoor units in that system (Ruc

Actual cooling capacity of each indoor unit (7) = Corrected cooling capacity of each indoor unit (5) (In other words, the correction coefﬁ cient (6), based on the corrected indoor/outdoor capacity ratios for each indoor unit, is 1.)

If the corrected outdoor unit cooling capacity is less than the total corrected unit cooling capacity of all indoor units in that system (Ruc > 1), then:

(Actual cooling capacity of each indoor unit (7)) = (Corrected cooling capacity of each indoor unit (5)) × (0.25 × Ruc + 0.75) / Ruc (In other words, the correction coefﬁ cient (6), based on the corrected indoor/outdoor capacity ratios for each indoor unit, is the underlined part in the formula above.)

Corrected indoor/outdoor capacity ratio during heating (Ruh) = Total corrected heating capacity of all indoor units in that system / Corrected outdoor unit heating capacity

If the corrected outdoor unit heating capacity is greater than or equal to the total corrected unit heating capacity of all indoor units in that system (Ruh

Actual heating capacity of each indoor unit (7) = Corrected heating capacity of each indoor unit (5)

(In other words, the correction coefﬁ cient (6), based on the corrected indoor/outdoor capacity ratios for each indoor unit, is 1.)

If the corrected outdoor unit heating capacity is less than the total corrected unit heating capacity of all indoor units in that system (Ruh > 1), then:

(Actual heating capacity of each indoor unit (7)) = (Corrected heating capacity of each indoor unit (5)) × (0.1 × Ruh + 0.9) / Ruh (In other words, the correction coefﬁ cient (6), based on the corrected indoor/outdoor capacity ratios for each indoor unit, is the underlined part in the formula above.)

1), then:

2 - 12

Design of 3WAY VRF SYSTEM

1. Model Selecting and Capacity Calculator

Refer to the graph below for the correction coefﬁ cients for Ruc and Ruh.

Indoor unit capacity correction coefficient for Ruc (cooling) Indoor unit capacity correction coefficient for Ruh (heating)

1.0

0.9

0.8

0.7

0.6

0.5

Indoor unit capacity correction coefficient

0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9

Corrected indoor/outdoor capacity ratio (Ruc or Ruh)

NOTE

When Ruc or Ruh is less than or equal to 1.0, the indoor unit capacity correction coefficient for both Ruc and Ruh is 1.0.

2.0

5. Graph of capacity correction coefficients

Graph of outdoor unit capacity characteristics (1 – (2))

Outdoor unit cooling capacity characteristics

120

110

100

Rate of cooling capacity change (%)

23 32 41 50 59 68 77 86 95 104 113

Outdoor air intake temp. (°F DB) Outdoor air intake temp. (°F WB)

Outdoor unit heating capacity correction coefﬁ cient during frosting/defrosting (1 – (4))

Outdoor intake air

(°FWB RH85%)

temp.

Correction coefficient 0.97 0.97 0.97 0.96 0.94 0.91 0.89 0.87 0.87 0.87 0.88 0.89 0.91 0.92 0.95 1.0

* To calculate the heating capacity with consideration for frosting/defrosting operation, multiply the heating capacity found

from the capacity graph by the correction coefﬁ cient from the table above.

–4 5 1417212324283032333537394142

Outdoor unit heating capacity characteristics

120

110

100

Rate of heating capacity change (%)

-4 5 142332415059

2 - 13

1. Model Selecting and Capacity Calculator

Graph of indoor unit capacity characteristics (2 – (2))

Indoor unit cooling capacity characteristics Indoor unit heating capacity characteristics

Design of 3WAY VRF SYSTEM

120

110

100

57 59 60 62 64 66 68 69 71 73 75 77 59 60 62 64 66 68 69 71 73 75 77 78

Indoor air intake temp. ( °F WB)

Rate of cooling capacity change (%)

indicates the rating point. indicates the rating point.

110

105

100

Indoor air intake temp. ( °F DB)

Rate of heating capacity change (%)

Graph of capacity change characteristics resulting from tubing length and elevation difference (1 / 2 – (3))

Base capacity change rate

164

131

100

-33

Elevation difference (ft)

-66

-98

-131 0 98 66 33 131 164 197 230 262 295 328 361 394 427 459 492

92 90 88 86 84 82 80 78 76

Equiv

alent length (ft)

The positive side for the elevation difference indicates that the outdoor unit is installed at a higher position than the indoor units. The negative side indicates the opposite.

Base capacity change rate

164

131

-33

Elevation difference (ft)

-66

-98

-131 0 98 66 33 131 164 197 230 262 295 328 361 394 427 459 492

Equivalent length (ft)

The capacity loss that is caused by the tubing length can be reduced by increasing the sizes of the discharge tubes and suc-

tion tubes. Refer to Table 2-9 and make the appropriate changes. However be sure that the total length does not exceed the maximum. * The only sizes which can be increased are the LM (main tube with the largest diameter) gas tubes, and the changes are

limited to those shown in Table 2-9. In addition, note that the additional refrigerant charge is determined only by the narrow-tube size.

Table 2-9 Equivalent Length Correction Coefﬁ cient when the Size of the Discharge Tubes and Suction Tubes (LM)

is Increased

Standard tubing diameter (gas tube, in.(mm))

Tubing diameter after change (gas tube,in.(mm))

Equivalent length correction coefficient

ø1/2"

(ø12.7)

ø5/8" ø3/4" ø7/8" ø1-1/8" ø1-3/8"

(ø15.88) (ø19.05) (ø22.22) (ø28.58) (ø34.92)

ø5/8"

(ø15.88) (ø19.05) (ø22.22) (ø28.58)

0.4 0.5 0.6

ø3/4" ø7/8" ø1-1/8"

* If the size of the discharge tubes and suction tubes (LM) have been increased, apply the correction coefﬁ cient from Table

2-9 and calculate the equivalent length of the LM section.

Equivalent length of tubing after size increase = Standard tubing equivalent length × Equivalent length correction coefﬁ cient

2 - 14

Design of 3WAY VRF SYSTEM

1. Model Selecting and Capacity Calculator

1-9. Capacity Correction Graph According to Temperature Condition

Capacity characteristics

(The corrected capacity for speciﬁ c temperature conditions can be found from the graphs below.)

< Cooling > < Heating >

6-Ton 8-Ton

130

Indoor air intake temp. (WB) = 71 FIndoor air intake temp. (WB) = 71 F

Indoor air intake temp. (WB) = 72°F

120

110

WB = 67°F

100

WB = 61°F

Capacity ratio (%)

120

110

100

Indoor air intake temp. (WB) = 72°F

WB = 67°F

WB = 61°F

Input ratio (%)

14 23 32 41 50 59 68 77 86 95

104 113

130

120

110 110

100

Capacity ratio (%)

130

120

100

Input ratio (%)

- 4

Indoor air intake temp. (°F DB)

5 142332415059

130

120

100

Capacity ratio (%)

130

120

110110

100

Input ratio (%)

- 4

5 142332415059

Indoor air intake temp. (°F DB)

Heating capacity correction coefﬁ cients for frost/defrost operation

Outdoor intake air temp.

–4 5 1417212324283032333537394142

(°F WB RH85%)

Correction coefficient 0.97 0.97 0.97 0.96 0.94 0.91 0.89 0.87 0.87 0.87 0.88 0.89 0.91 0.92 0.95 1.0

* The heating capacity when frost/defrost operation is considered is calculated by multiplying the heating capacity found

from the capacity graph by the correction coefﬁ cient from the table above.

2 - 15

Design of 3WAY VRF SYSTEM

1. Model Selecting and Capacity Calculator

Rated performance values

Item Cooling Heating

Cooling capacity

Type

72 72,000(21.1) 5.30 81,000(23.7) 5.79

96 96,000(28.1) 7.75 108,000(31.6) 8.6

BTU/h(kW)

1-10. Capacity Correction Graph According to Tubing Length and Elevation Difference

Capacity change characteristics

Base capacity change rate

164

131

100

–33

Elevation difference (ft)

–66

–98

–131

0 33 66 98 131 164 197 230 262 295 328 361 394 427 459 4920 33 66 98 131 164 197 230 262 295 328 361 394 427 459 492

92 90 88 86 84 82 80 78 76

Equivalent length (ft)

Power consumptionkWHeating capacity

BTU/h(kW)

Power consumption

Base capacity change rate

164

131

–33

–66

Elevation difference (ft)

–98

–131

0 33 66 98 131 164 197 230 262 295 328 361 394 427 459 492

Equivalent length (ft)

NOTE

The positive side for the elevation difference indicates that the outdoor unit is installed at a higher position than the indoor units. The negative side indicates the opposite.

*1 Sample calculations

(System: 8 Ton, 164ft equivalent length, 49ft elevation difference The cooling capacity and heating capacity for this system are found as shown below.)

●

Cooling operation

From the graph, the base capacity change rate is found to be

92.0%.

96,000 BTU/h

(28.1kW

●

Heating operation

From the graph, the base capacity change rate is found to be

97.2%. Because the calculation result exceeds 97.2%, the capacity change rate is 97.2%.

(31.6kW

92.0% = 88,320 BTU/h

92.0% = 25.8kW)

97.2% = 105,000 BTU/h108,000 BTU/h

97.2% = 30.7kW) Heating capacity is

Capacity change rate is 92.0%. Cooling capacity is 88,320 BTU/h (28.1 kW)

105,000 BTU/h (30.7 kW)

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