Panasonic S-19MS1U6 installation

INSTALLATION INSTRUCTIONS

2WAY VRF System Air Conditioner

SUPPLEMENT

Regarding the system connected to the indoor unit model S-19MS1U6, see the following contents.

1. Additional sentences are provided in the "NOTE" under the section "Table 1-2 Ranges that Apply to Refrigerant Tubing Lengths and to Differences in Installation Heights " on page 8 in the Installation Instructions.

7: If the tubing length which is connected to the model S-19MS1U6 is less than 8 m (26.2 ft) between the outdoor unit and the final distribution joint, increase the size of the gas tube between them by one-rank-higher.

2. Replace the section "Table 1-7 Indoor Unit Tubing Connection Size" on page 9 in the Installation Instructions with the following table.

Table 1-7 Indoor Unit Tubing Connection Size

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

Gas tubing ø1/2" (ø12.7) ø5/8" (ø15.88)

Liquid tubing ø1/4" (ø6.35) ø3/8" (ø9.52)

* When connecting the gas tube for S-19MS1U6, use a field supply reducer.

3. Replace the section "Necessary Amount of Additional Refrigerant Charge for All Indoor Unit Cooling Capacity" on page 10 in the Installation Instructions with the following table.

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)

* However, calculate the cooling capacity of the indoor unit S-19MS1U6 as 0 kW.

Unit: in. (mm)

85464369760021-SP

INSTALLATION INSTRUCTIONS

2WAY VRF System 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

U 2WAY VRF System

72 96 120 144

U-72ME2U9 U-96ME2U9 U-120ME2U9 U-144ME2U9

• To be connecting Indoor Unit

Type Indoor Unit Type

D1 1-Way Cassette S-07MD1U6 S-09MD1U6 S-12MD1U6

U1 4-Way Cassette S-12MU1U6 S-18MU1U6

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

K1 Wall Mounted S-07MK1U6 S-09MK1U6 S-12MK1U6 S-18MK1U6

T1 Ceiling S-12MT1U6 S-18MT1U6

F1 Low Silhouette Ducted S-07MF1U6 S-09MF1U6 S-12MF1U6 S-15MF1U6 S-18MF1U6

M1 Slim Low Static Ducted S-07MM1U6 S-09MM1U6 S-12MM1U6 S-15MM1U6 S-18MM1U6

E1 High Static Pressure Ducted

P1 Floor Standing S-07MP1U6 S-09MP1U6 S-12MP1U6 S-15MP1U6 S-18MP1U6

R1 Concealed Floor Standing S-07MR1U6 S-09MR1U6 S-12MR1U6 S-15MR1U6 S-18MR1U6

7 9 12 15 18

Nominal Capacity

Type Indoor Unit Type

D1 1-Way Cassette

U1 4-Way Cassette S-24MU1U6 S-36MU1U6

Y1 4-Way Cassette 60 × 60

K1 Wall Mounted S-19MS1U6*

T1 Ceiling S-24MT1U6

F1 Low Silhouette Ducted S-24MF1U6 S-36MF1U6 S-48MF1U6 S-54MF1U6

M1 Slim Low Static Ducted

E1 High Static Pressure Ducted S-36ME1U6 S-48ME1U6

P1 Floor Standing S-24MP1U6

R1 Concealed Floor Standing S-24MR1U6

19 24 36 48 54

S-24MK1U6

Nominal Capacity

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

85464369760021 CV6231977845

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

unsafe practice which can result in severe personal injury or death.

This symbol refers to a hazard or

unsafe practice which can result in personal injury or product or property damage.

If Necessary, Get Help

These instructions are all you need for most installation

sites and maintenance conditions. If you require help for a special problem, contact our sales/service outlet or your

certified dealer for additional instructions.

In Case of Improper Installation

The manufacturer shall in no way be responsible for

improper installation or maintenance service, including failure to follow the instructions in this document.

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.

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.

Keep the fire alarm and the air outlet at least 5 feet (1.5m) away from the unit.

SPECIAL PRECAUTIONS

WARNING

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

• overheating at connection points and a possible fire 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 fire in case of equipment breakdown or insulation breakdown.

When Wiring

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 refrigerant cycle.

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.

• Check for a leaking refrigerant!

Refrigerant gas may produce a toxic gas if it comes in contact with 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.

WARNING

• This product must not be modified or disassembled under

any circumstances. Modified or

disassembled unit may cause fire, 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.

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 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 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 (11.3kg) per 1,000 cubic feet (28.3m3) 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.”

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

CAUTION

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.

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

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

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

in the unit.

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

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

3. Different tools required

3-1. Tool specifications have been changed due to the characteristics of R410A. Some tools for R22- and R407C-type refrigerant systems cannot be used.

R407C tools

Item

Manifold gauge Yes No

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

Vacuum pump Yes Yes

Leak detector Yes No

Flaring oil Yes No

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

New

tools?

compatible

with R410A?

Remarks

Types of refrigerant, refrigerating machine oil, and pressure gauge are different.

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 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.

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.

Manifold gauge

Vacuum pump

Outlet

Inlet

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.

Valve

Single-outlet valve

(with siphon tube) Liquid refrigerant should be recharged

with the cylinder standing on end as shown.

Liquid

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)

CONTENTS

Page Page

IMPORTANT! ............................. 2

Please Read Before Starting Check of Density Limit Precautions for Installation Using New Refrigerant New refrigerant R410A cannot be used for earlier models

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

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

1-2. Accessories Supplied

1-3. Type of Copper Tube and Insulation Material

1-4. Additional Materials Required for Installation

1-5. Tubing Length

1-6. Tubing Size

1-7. Straight Equivalent Length of Joints

1-8. Additional Refrigerant Charge

1-9. System Limitations

1-10. 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 .... 16

5. HOW TO PROCESS TUBING ............. 32

5-1. Connecting the Refrigerant Tubing

5-2. Connecting Tubing Between Indoor and

Outdoor Units

5-3. Insulating the Refrigerant Tubing

5-4. Taping the Tubes

5-5. Finishing the Installation

6. AIR PURGING ......................... 35

Air Purging with a Vacuum Pump (for Test Run)

Preparation

7. TEST RUN ............................ 38

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

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 ... 22

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 .................. 27

4-1. General Precautions on Wiring

4-2. Recommended Wire Length and Wire

Diameter for Power Supply System

4-3. Wiring System Diagram

1. GENERAL

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

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

1. Flathead screwdriver

2. Phillips head screwdriver

3. Knife or wire stripper

4. Tape measure

5. Level gauge

6. Sabre saw or 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

Table 1-1 Outdoor Unit

Part name Connection tubing

Inner

diameter

ø1"

(ø25.4mm)

Figure

Instruction

manual

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.

“

Refer to

4. ELECTRICAL WIRING” for details.

Check local electrical codes and

CAUTION

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

Q’ty

U-72ME2U9

(6 ton)

U-96ME2U9

(8 ton)

U-120ME2U9

(10 ton)

U-144ME2U9

(12 ton)

Outer

diameter

ø1-1/8"

(ø28.58mm)

0 1

1 1

paper

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.

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.

Sizes of indoor unit connection tubing

1 – 64 are determined by the connection tubing sizes on the indoor units.

Balance tubing

(ø1/4" (6.35mm))

No.1 distribution joint for outdoor unit No.1 distribution joint (for indoor unit)

Explanation of symbols

Distribution joint

(CZ: optional parts)

Ball valve (field supply)

T-joint (field supply)

Solidly welded shut (pinch weld)

Max.1.3 ft (40cm)

For extension

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)

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

Item Mark Contents Length

Actual length

Equivalent length

Allowable tubing

length

Allowable elevation

difference

Allowable length of joint tubing

L1 Max. tubing length

L (L2 – L4)

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

LM Max. length of main tubing (at maximum size)

1, 2~ 64 Max. length of each distribution tube

L1 + 1 + 2~ 63 + A

+ B + LF + LG + LH

A, B + LO, C + LO

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

Maximum tubing length from outdoor’s 1st distribution

joint to each outdoor unit When outdoor unit is installed higher than indoor unit

When outdoor unit is installed lower than indoor unit

H2 Max. difference between indoor units

H3 Max. difference between outdoor units

T-joint tubing (field-supply); Max. tubing length between the

first T-joint and solidly welded-shut end point

unit: ft. (m)

656 (200)*

689 (210)*

164 (50)*

3280 (1000)

33 (10)

164 (50)

131 (40)

49 (15)*

13 (4)

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): 15 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.

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)

BTU/h

(kW)

Total system tonnage

Gas tubing

Liquid tubing

72,000

(21.1)

ø3/4"

(ø19.05)

96,000

(28.1)

6 8 10 12 14 16 18 20 22 24 26 28 30

ø7/8"

(ø22.22)

ø3/8"

(ø9.52)

120,000

(35.2)

(ø12.7)

ø1/2"

144,000

(42.2)

168,000

(49.2)

ø1-1/8"

(ø28.58)

192,000

(56.3)

ø5/8"

(ø15.88)

216,000

(63.3)

240,000

(70.3)

264,000

(77.4)

288,000

(84.4)

ø1-3/8"

(ø34.92)

(ø19.05)

312,000

(91.4)

ø3/4"

*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.

Size of tubing (LO) between outdoor units

Select the size of tubing between outdoor units based on the main tubing size (LA) as given in the table above.

Table 1-4 Main Tubing Size After Distribution (LB, LC...)

Total capacity

after distribution

Tubing size

Below BTU/h (kW)

Over BTU/h (kW) –

Gas tubing

Liquid tubing

24,200

(7.09)

ø1/2"

(ø12.7)

ø3/8"

(ø9.52)

54,600

(16.0)

24,200

(7.09)

ø5/8"

(ø15.88)

ø3/8"

(ø9.52)

76,800

(22.5)

54,600

(16.0)

ø3/4"

(ø19.05)

ø3/8"

(ø9.52)

102,400

(30.0)

76,800

(22.5)

ø7/8"

(ø22.22)

ø3/8"

(ø9.52)

143,300

(42.0)

102,400

(30.0)

ø1-1/8"

(ø28.58)

ø1/2"

(ø12.7)

178,800

(52.4)

143,300

(42.0)

ø1-1/8"

(ø28.58)

ø1/2"

(ø12.7)

238,900

(70.0)

178,800

(52.4)

ø1-1/8"

(ø28.58)

ø5/8"

(ø15.88)

340,000

(99.6)

238,900

(70.0)

ø1-3/8"

(ø34.92)

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.

Unit: in. (mm)

336,000

(98.5)

Unit: in. (mm)

360,000

(ø41.28)

–

340,000

(99.6)

ø1-5/8"

(ø41.28)

ø3/4"

(ø19.05)

(105.5)

ø1-5/8"

Table 1-5 Outdoor Unit Tubing Connection Size (

BTU/h

(kW)

Gas tubing

Liquid tubing

Balance tubing

72,000

(21.1)

ø3/4" *

(ø19.05) *

ø3/8" (ø9.52) ø3/8" (ø9.52) ø1/2" (ø12.7)

96,000

(28.1)

ø7/8" *

(ø22.22)*

Brazing connection

Flare connection

ø1/4" (ø6.35)

Flare connection

120,000

(35.2)

–

ø1-1/8"

(ø28.58)

)

Unit: in. (mm)

144,000

(42.2)

ex.) type72

Balance tube

Liquid tube

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

Table 1-7 Indoor Unit Tubing Connection Size

oz (g) 321 (9,100) 363 (10,300) 300 (8,500) 416 (11,800)

Unit: in. (mm)

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

Gas tubing ø1/2" (ø12.7) ø5/8" (ø15.88)

Liquid tubing ø1/4" (ø6.35) ø3/8" (ø9.52)

Gas tube

1-7. Straight Equivalent Length of Joints

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

Table 1-8 Straight Equivalent Length of Joints

Gas tubing size (in. (mm))

90° elbow

45° elbow

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

Trap bend

Y-branch distribution joint

Ball valve for service Equivalent length conversion not needed.

1/2"

(12.7)

(0.30)

0.8

(0.23)

(0.90)

7.5

(2.30)

Table 1-9 Refrigerant tubing (Existing tubing can be used.)

Tubing size (in. (mm))

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)

5/8"

(15.88)

1.1

(0.35)

0.9

(0.26)1(0.32)

3.4

(1.05)

9.2

(2.80)

Equivalent length conversion not needed.

3/4"

(19.05)

1.4

(0.42)

4.1

(1.26)

10.5

(3.20)

7/8"

(22.22)

1.6

(0.48)

1.2

(0.36)

4.7

(1.44)

12.5

(3.80)

1-1/8"

(28.58)

1.9

(0.57)

1.4

(0.43)

5.6

(1.71)

15.4

(4.70)

* 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.

1-3/8"

(34.92)

2.5

(0.76)

1.8

(0.55)

7.4

(2.26)

19.2

(5.85)

Unit: ft. (m)

1-5/8"

(41.28)

2.8

(0.85)

2.0

(0.61)

8.4

(2.56)

22.3

(6.80)

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

Additional amount

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 1 2 3

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.

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)

oz/ft. 0.279 0.602 1.38 1.99 2.78 3.93

(g/m) (26) (56) (128) (185) (259) (366)

1-9. System Limitations

Table 1-11 System Limitations

Max. No. allowable connected outdoor units 3

Max. capacity allowable connected outdoor

units

360,000 BTU/h

(30 ton, 105.5 kW)

Max. connectable indoor units 64

Max. allowable indoor/outdoor capacity ratio 50 – 200 %

*1: In the case of 18 ton (63.3kW) or smaller units, the number is

limited by the total capacity of the connected indoor units. *2: Up to 3 units can be connected if the system has been extended. *3: It is strongly recommended that you choose the unit so the load

can become between 50 and 130%.

Table 1-12 System Limitations of Total Refrigerant Amount

Combination number of outdoor unit 1 2 3

Upper limit oz (

) 1,763 (50,000) 2,821 (80,000) 3,703 (105,000)

Make sure the values calculated using the following formula should not exceed the maximum allowable values (Table 1-12).

Total refrigerant amount = Refrigerant charge amount at shipment (for outdoor unit)

+ Necessary amount of additional refrigerant charge per ft. (or per meter) according to liquid tubing size

+ Necessary amount of additional refrigerant charge per outdoor unit + Necessary amount of additional refrigerant charge for all indoor unit cooling capacity

Maximum number of connectable indoor units when connected with minimum capacity

Total system

tonnage

Number of

indoor units

Total system

tonnage

Number of

indoor units

6 20 14 45

8 25 16 50 10 32 18 55 12 39 20~30 64

WARNING

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

1-10. Check of Limit Density

When installing an air conditioner in a room, it is necessary to

ensure that even if the refrigerant gas accidentally leaks out, its

density does not exceed the limit level for that room.

Pay special attention to any location, such as

CAUTION

a basement, etc., where leaking refrigerant can accumulate, since refrigerant gas is heavier than air.

1-11. Installing Distribution Joint

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

with the optional distribution joint kit (CZ-P680PJ1U, CZ-P1350PJ1U, CZ-P160BK1U, CZ-P680BK1U, CZ-P1350BK1U).

(2) When creating a branch using a commercially available T-joint

(header joint system), orient the main tubing so that it is either horizontal (level) or vertical. In order to prevent accumulation of refrigerant oil in stopped units, if the main tubing is horizontal and directly connected to the indoor unit, each branch tubing length should be at an angle that is greater than horizontal. If there are other cases, keep the main tubing horizontal (level). If the main tubing is vertical, provide a raised starting portion for each branch.

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

tubing that follows a distribution joint is connected to only 1 unit, a trap or ball valve must be added to that distribution joint. (When adding the ball valve, locate it within 1.3 ft. (40cm) of the distribution joint.)

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

Tube branching methods

(horizontal use & direct connection to indoor unit)

Arrow view D

15° to 30°

view D

Types of vertical trap specifications

(When using ball valve)

Main tubing

Ball valve

(BV: purchased

separately)

Indoor unit (1)

(When not using ball valve)

Main tubing

Indoor unit is directed downward

Indoor unit (more than 2 units)

Branch tubing is

directed upward.

More than 8 inch (20cm)

(If only 1 unit is connected, a ball valve

is also needed on this side.)

Arrow view C

Horizontal Indoor unit

15° to 30°

Horizontal

line

view C

(Each unit is connected

to tubing that is either

level or is directed downward.)

View as seen from arrow

1-12. Optional Distribution Joint Kits

4-21/64

2-53/64

6-57/64

4-21/64

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

Table 1-12

Model name Cooling capacity after distribution Remarks

1. CZ-P680PJ1U 232,000 BTU/h (68.0 kW) or less For outdoor unit

2. CZ-P1350PJ1U 460,700 BTU/h (135.0 kW) or less For outdoor unit

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

4. CZ-P680BK1U 232,000 BTU/h (68.0 kW) or less For indoor unit

5. CZ-P1350BK1U 460,700 BTU/h (135.0 kW) or less For indoor unit

Tubing size (with thermal insulation)

1. CZ-P680PJ1U For outdoor unit (Capacity after distribution joint is 232,000 BTU/h (68.0 kW) or less.)

Example:

Distribution Joint

Reducing

Joints

Gas tubing Liquid tubing

6-59/64

(175) 5-5/16 (135)

Insulation

4-31/64

(114)

F E D C

Insulation

Distribution Joint

(110)

3-13/16

(97)

Reducing

Joints

(72)

Unit: in. (mm)

Table 1-13 Size of connection point on each part (Shown are inside diameters of tubing)

Size Part A Part B Part C Part D Part E Part F Part G Part H Part I

in. (mm)

ø1-3/8"

(ø34.92)

ø1-1/4"

(ø31.75)

ø1-1/8"

(ø28.58)

ø1"

(ø25.4)

ø7/8"

(ø22.22)

ø3/4"

(ø19.05)

ø5/8"

(ø15.88)

ø1/2"

(ø12.7)

2. CZ-P1350PJ1U For outdoor unit (Capacity after distribution joint is greater than 232,000 BTU/h (68.0 kW) and no more than

460,700 BTU/h (135.0 kW).)

Example:

Insulation

Distribution Joint

Table 1-14 Size of connection point on each part (Shown are inside diameters of tubing)

Size Part A Part B Part C Part D Part E Part F Part G Part H Part I

in. (mm)

ø1-3/8"

(ø34.92)

Gas tubing Liquid tubing

(175)

5-5/16

(135)

ø1-1/4"

(ø31.75)

C D

ø1-1/8"

(ø28.58)

Reducing

Joints

(ø25.4)

(114)

ø1"

4-31/64

: Outside dimension

ø7/8"

(ø22.22)

Insulation

ø3/4"

(ø19.05)

Distribution Joint

ø5/8"

(ø15.88)

(110)

3-13/16

(97)

(ø12.7)

ø1/2"

ø3/8"

(ø9.52)

(72)

Reducing

Joints

Unit: in. (mm)

ø3/8"

(ø9.52)

3. CZ-P160BK1U

4-21/64

2-53/64

6-57/64

2-53/64

6-57/64

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

Example:

Insulation

(110)

3-13/16 3-13/16

(97)

Distribution Joint

Gas tubing

(72)

2-53/64

Insulation

(110)

(97)

Distribution Joint

D E

Liquid tubing

Unit: in. (mm)

(72)

Table 1-15 Size of connection point on each part (Shown are inside diameters of tubing)

Size Part A Part B Part C Part D Part E

in. (mm)

ø3/4"

(ø19.05)

ø5/8"

(ø15.88)

ø1/2"

(ø12.7)

ø3/8"

(ø9.52)

ø1/4"

(ø6.35)

4. CZ-P680BK1U Use: For indoor unit (Capacity after distribution joint is greater than 76,400 BTU/h (22.4 kW) and no more than 232,000 BTU/h (68.0 kW).)

Example:

D C B

Insulation

Distribution Joint

(175)

5-5/16

(135)

Gas tubing

4-31/64

B C

E F

B C D

Reducing

Joints

E F

(114)

F G

Distribution Joint

Insulation

4-21/64

(110)

3-13/16

(97)

F G H

Liquid tubing

(72)

F G H

Reducing

Joints

Unit: in. (mm)

Table 1-16 Size of connection point on each part (Shown are inside diameters of tubing)

Size Part A Part B Part C Part D Part E Part F Part G Part H

in. (mm)

ø1-1/8"

(ø28.58)

ø1"

(ø25.4)

ø7/8"

(ø22.22)

ø3/4"

(ø19.05)

ø5/8"

(ø15.88)

ø1/2"

(ø12.7)

ø3/8"

(ø9.52)

ø1/4"

(ø6.35)

5. CZ-P1350BK1U Use: For indoor unit (Capacity after distribution joint is greater than 232,000 BTU/h (68.0 kW) and no more than 460,700 BTU/h (135.0 kW).)

Example:

Insulation

Gas tubing

Reducing

Joints

4-31/64

(114)

Distribution Joint

Insulation

: Outside dimension

(175)

5-5/16

C D

(135)

Distribution Joint

C D

G H

4-21/64

3-13/16

(110)

(97)

Liquid tubing

Reducing

Joints

Unit: in. (mm)

(72)

Table 1-17 Size of connection point on each part (Shown are inside diameters of tubing)

Size Part A Part B Part C Part D Part E Part F Part G Part H Part I Part J

in. (mm)

ø1-3/8"

(ø34.92)

ø1-1/4"

(ø31.75)

ø1-1/8"

(ø28.58)

ø1"

(ø25.4)

ø7/8"

(ø22.22)

ø3/4"

(ø19.05)

ø5/8"

(ø15.88)

ø1/2"

(ø12.7)

ø3/8"

(ø9.52)

ø1/4"

(ø6.35)

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

Additional refrigerant charging

Based on the values in Tables 1-3, 4, 5, 7, 10-1 and 10-2, use the liquid tubing size and length, and calculate the amount of additional refrigerant charge using the formula below.

Unit of account (oz)

Required additional refrigerant charge (oz)

Unit of account (

)

Required additional

refrigerant charge (g)

(a) : Liquid tubing Total length of ø7/8" (ft.) or (m) (d) : Liquid tubing Total length of ø1/2" (ft.) or (m)

(b) : Liquid tubing Total length of ø3/4" (ft.) or (m) (e) : Liquid tubing Total length of ø3/8" (ft.) or (m)

Charging procedure

Be sure to charge with R410A refrigerant in liquid form.

1. After performing a vacuum, charge with refrigerant from the liquid tubing side.

At this time, all valves must be in the “fully closed” position.

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

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

Replace the tubing covers as they were before.

CAUTION

For type 72 For type 96 For type 120/144

Balance tube

Use a flathead screwdriver and

open by turning the part with the

screw groove to the right, from “–” to “|”.

Necessary Amount of Additional Refrigerant Charge Per Outdoor Unit

+ 3.93 × (a) + 2.78 × (b) + 1.99 × (c) + 1.38 × (d) + 0.602 × (e) + 0.279 × (f)

+ Necessary amount of additional refrigerant charge for all indoor unit cooling capacity

Necessary Amount of Additional Refrigerant Charge Per Outdoor Unit

+ 366 × (a) + 259 × (b) + 185 × (c) + 128 × (d) + 56 × (e) + 26 × (f)

+ Necessary amount of additional refrigerant charge for all indoor unit cooling capacity

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

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

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

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

Balance tube

Use a flathead screwdriver and

open by turning the part with the

screw groove to the right, from “–” to “|”.

Balance tube

Use a flathead screwdriver and

open by turning the part with the

screw groove to the right, from “–” to “|”.

Liquid tube

Use a hex wrench (width 5/32 inch (4mm)) and turn to the left to open.

Gas tube

Use a flathead screwdriver and

open by turning the part with the

screw groove to the right, from “–” to “|”.

Liquid tube

Use a hex wrench (width 5/32 inch (4mm)) and turn to the left to open.

Gas tube

Use a flathead screwdriver and

open by turning the part with the

screw groove to the right, from “–” to “|”.

Liquid tube

Use a hex wrench (width 5/32 inch (4mm)) and turn to the left to open.

Gas tube

Use a flathead screwdriver and

open by turning the part with the

screw groove to the right, from “–” to “|”.

Example:

Outdoor unit

Type 96 Type 72

Example of all outdoor units cooling capacity

Type 72: 72,000BTU/h (21.1 kW)

Type 96: 96,000BTU/h (28.1 kW)

[Total] 168,00 BTU/h (49.2 kW)

1 2 3 4

Example of each tubing length

Main tubing Distribution joint tubing

LA = 131 ft. (40m) Outdoor side Indoor side LB = 16 ft. (4.9m)

LC = 16 ft. (4.9m)

A = 7 ft.

B = 7 ft.

(2.1m) (2.1m)

1 = 98 ft. 2 = 16 ft. 3 = 16 ft. 4 = 65 ft.

Example of all indoor unit cooling capacity

(30m) (4.9m) (4.9m) (19.8m)

[Type 48 x 3] 47,800 x 3 = 143,400 BTU/h (14.0 x 3 = 42.0 kW)

Type 48 Type 48 Type 48 Type 36

[Type 36 x 1] 36,000 x 1 = 36,000 BTU/h (10.6 x 1 = 10.6 kW)

[Total] 179,400 BTU/h (52.6 kW)

Obtain liquid tubing size from Tables 1-3, 4, 5, 7 and 10-1.

Main tubing

LA = ø5/8 (ft. (m)) (Total capacity of indoor unit is 179,400 BTU/h (52.6kW)) LB = ø1/2 (ft. (m)) (Total capacity of indoor unit is 131,600 BTU/h (38.6kW))

The longest tubing length in this example

(LA = 131 ft. (40m))

LC = ø3/8 (ft. (m)) (Total capacity of indoor unit is 83,800 BTU/h (24.6kW))

Distribution joint tubing

Outdoor side

Indoor side

Obtain additional charge amount for each tubing size and additional refrigerant charge amount for all indoor unit cooling capacity.

A: ø3/8 (ft. (m)) B: ø3/8 (ft. (m)) (from outdoor unit connection tubing) 1: ø3/8 (ft. (m)) 2: ø3/8 (ft. (m)) 3: ø3/8 (ft. (m)) 4: ø3/8 (ft. (m)) (from indoor unit connection tubing)

Note 1: The charge amounts per 1 ft. are different for each liquid tubing size.

ø5/8 (ft.)(m)í LA : 131 ft. × 1.99 oz/ft. = 261 oz (40m × 185 g/m = 7,400g)

ø1/2 (ft.)(m)í LB : 16 ft. × 1.38 oz/ft. = 22 oz (4.9m × 128 g/m = 627g)

ø3/8 (ft.)(m)í LC +

A – B + 1 – 4 : 225 ft. × 0.602 oz/ft. = 135 oz (68.6m × 56 g/m = 3,842g)

Total 418 oz (Total 11,869g)

Additional refrigerant charge amount is 418 oz (11,869g).

Note 2: Necessary amount of additional refrigerant charge per outdoor unit is 141oz (4,000g) in combination of 2 units.

(See the Table 1-10-2.)

Note 2) Amount of additional charge for outdoor unit (combination number) : 141oz (4,000g)

Note 3: Necessary amount of additional refrigerant charge for all indoor unit cooling capacity

[BTU/h] [kW]

179,400 BTU/h Cooling capacity (BTU/h) x 1.034 x 0.001 + 10.6 oz = 179,400 x 1.034 x 0.001 + 10.6 = 196 oz

(52.6 kW) (Cooling capacity (kW) x1000 x 0.1 + 300

= 52.6 x 1000 x 0.1 + 300 = 5,560 g)

Note 1) Amount of additional charge per tubing length : 418 oz (11,869g) Note 2) Amount of additional charge for outdoor unit (combination number) : 141 oz (4,000g)

Note 3) Amount of additional charge for all indoor unit cooling capacity 196 oz (5,560g) Total of additional refrigerant charge amount : 755 oz (21,429g)

Therefore, the total of additional refrigerant charge amount reaches 755 oz (21,429g).

Obtain overall refrigerant charge amount.

Overall refrigerant charge amount of the system indicates the calculated value shown above the additional charge amount in

addition to the total refrigerant charge amount (shown in the Table 1-6) at shipment in total cooling capacity of outdoor unit.

Refrigerant charge amount at shipment (total cooling capacity of outdoor unit) : : [168,000BTU/h] 684 oz [49.2kW] (19,400g) Total of additional refrigerant charge amount

755 oz (21,429g)

Grand total 1,439 oz (40,829g)

Therefore, overall refrigerant charge amount of the system reaches 1,439 oz (40,829g).

Remark:

Be sure to include the values in Table 1-10-2 Necessary Amount of Additional Refrigerant Charge Per Outdoor Unit.

CAUTION

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

2. SELECTING THE INSTALLATION SITE

2-1. Outdoor Unit

Example: 2 units installation

* For other installation, follow the standards of combination

installation.

AVOID:

heat sources, exhaust fans, etc.

damp, humid or uneven locations

indoors (no-ventilation location)

DO:

choose a place as cool as possible.

choose a place that is well ventilated.

allow enough room around the unit for air intake/exhaust and possible maintenance.

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

and noise.

Exhaust fan

Hot air

Heat

Outdoor unit

source

Fig. 2-1

Installation Space

Install the outdoor unit where there is enough space for

ventilation. Otherwise the unit may not operate properly.

Fig. 2-2 shows the minimum space requirement around

the outdoor units when 3 sides are open and only 1 side is

shuttered, with open space above the unit. The mounting base should be concrete or a similar material that allows for adequate drainage. Make provisions for anchor bolts, platform height, and other site-specific installation requirements.

Wall height: Less than 1.7ft. (500mm)

Wall height: Unlimited

* Over 2 in.

(50mm)

Over 2-3/8 in. (60mm)

Wall height: Less than 4.9 ft. (1500mm)

Over 1 ft.(300mm)

* Over 2 in. (50mm)

Over 1.7ft. (500mm)

Wall height: Unlimited

* When setting the anchor bolt to "B" or "C" (see page 19),

make enough space for installation operation. (Space between units: Over 0.6 ft. (180mm), Space from

wall: Over 0.83 ft. (250mm))

* When installing a snow-proof ducting, make space between

the units 7-3/32” (180mm) regardless of the positions (A - C) for installation holes.

* Make a walk-in space in front and behind the unit to ensure

ease of operation.

Fig. 2-2

Leave space open above the

CAUTION

unit.

Construct louvers or other openings in the wall, if necessary, to ensure adequate ventilation.

NOTE

Do not do any wiring or tubing within 1 ft. (0.3m) of the front panel, because this space is needed as a servicing space

for the compressor.

Ensure a base height of 4" (10cm) or more to ensure that drainage water does not accumulate and freeze around the bottom of the unit.

If installing a drain pan, install the drain pan prior to

installing the outdoor unit.

* Make sure there is at least 6" (15cm) between the outdoor

unit and the ground.

Also, the direction of the tubing and electrical wiring should be from the front of the outdoor unit.

2-2. Shield for Horizontal Exhaust Discharge

It is necessary to install an air-discharge chamber (field supply) to direct exhaust from the fan horizontally if it is difficult to provide a minimum space of 7 ft. (2m) between the air-discharge outlet and a nearby obstacle. (Fig. 2-3)

In regions with heavy snowfall,

CAUTION

the outdoor unit should be provided with a solid, raised platform and snow-proof ducting (field supply). (Fig. 2-4)

2-3. Installing the Outdoor Unit in Heavy Snow

Areas

In locations where wind-blown snow can be a problem, snow-proof ducting (field supply) should be fitted to the unit and direct exposure to the wind should be avoided as much as possible. (Fig. 2-5) The following problems may occur if proper countermeasures are not taken:

The fan in the outdoor unit may stop running, causing the

unit to be damaged.

There may be no air flow.

The tubing may freeze and burst.

The condenser pressure may drop because of strong wind,

and the indoor unit may freeze.

Fig. 2-3

2-4. Precautions When Installing in Heavy Snow

Areas

a) The platform should be higher than the maximum snow

depth. (Fig. 2-4)

b) The 2 anchoring feet of the outdoor unit should be used for

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

c) The platform foundation must be solid and the unit must

be secured with anchor bolts.

d) When installing on a roof subject to strong wind,

countermeasures must be taken to prevent the unit from being overturned.

AVOID

Without snowproof ducting (Without platform)

Fig. 2-4

Fallen snow

With snowproof ducting (High platform)

Fig. 2-5

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