Hitachi RAM-8MQ Inverter-Driven Multi-Split System Air Conditioners User manual

1

INVERTER-DRIVEN

MULTI-SPLIT SYSTEM

AIR CONDITIONERS

Outdoor Units

Installation＆Maintenance Manual

Models：

8HP 10HP 12HP 14HP 16HP 18HP

RAM-8MQ(D) RAM-10MQ(D) RAM-12MQ(D) RAM-14MQ(D) RAM-16MQ(D) RAM-18MQ(D)

 Be sure to hand over this manual to constructor of next step and finally let the customer keep it.

(Transportation and Handling) → (Refrigerant Piping) → (Electrical Wiring) → (Test Run) → (Customer)

Important Notice

z This air conditioner has been designed for common air conditioning for people. Do not apply to other purposes such as for food, animals,

plants, high precision machines or work of art.

z Do not install the unit in the following places. It may cause fire, deformation, corrosion or failure.

○ Places where is filled with mineral oil mist or oil spray (including machinery oil) or vapor is produced.

○ Places where is filled with sulfurous gas such as hot spring area.

z Do not install the unit in the following places, it may cause corrosion.

○ Places where strong salty wind blows such as coast regions.

○ An acid or alkaline environment.

z Pay attention to the following situations when the unit is installed in a hospital or other facilities where electromagnetic wave is radiated from

medical equipment.

○ Do not install the unit where the electromagnetic wave is directly radiated to the electrical box, remote control cable or remote control

switch.

○ To avoid the influence of electromagnetic waves via air, wave generating machines such as radio, medical equipment must be kept at

least 3 meters from air conditioner.

z Do not install the unit in the place where wind directly blows on animals or plants. It could adversely affect the animals or plants.

z Using wireless remote controller, the receiver may fail to receive signals due to effect of the lighting equipment. Therefore keep the receiver

away from the lighting equipment more than 1 meter as possible.

Safety Summary

z Before installation, read this section carefully in order to install correctly.

z This manual contains " Danger" symbol. This symbol indicates a hazardous situation which, if installed incorrectly, it may result in death or

serious injury. Therefore, make sure to observe important messages of safety.

z While checking any abnormality during the test run after installation, explain to customer the correct methods of usage and maintenance

according to the instructions of user’s manual. Then hand over the installation manual and user’s manual to customers.

 【Meaning of symbols】

DANGER：Indicates a hazardous situation which, If not avoided,

may result in death or serious injury.

：Mandatory Symbol: indicate instructing behavior of

general users.

：Mandatory Symbol: indicate grounding must be performed fo

r

machine with grounding terminal.

：Indicate prohibited item.

About Electrical Works

DANGER

z Assign an authorized dealer to perform the electrical work. Please note that if improperly performed by yourself, it may result in

electric shock.

z Perform electrical work according to relevant national regulations and the installation manual. Make sure to use the exclusive

circuit to avoid electric shock or fire due to insufficient capacity of power or improper work.

z Use only specified wires for wirings between units. Incorrect selection of wires also causes fire or electric shock.

z Properly fasten the terminals of wirings. Improper fastening the joint of terminals may result in fire, electric shock or the

overheated terminals.

z Fix the cables securely. External forces on the terminals could lead to a fire.

z Installation of an earth leakage breaker (ELB) is necessary. If an ELB is not installed, current leakage may occur.

z When opening the service cover due to need of wiring work or inspection, make sure to completely cut off power before work

to avoid electric shock.

z Perform grounding according to the grounding work instructions. Incident of electric shock may occur if indoor and outdoor units

are not grounded. The ground wire must not be connected to gas pipe, water pipe, lighting rod and ground wire of telephone line.

If the ground wire is not properly connected, it may result in electric shock.

About installation

DANGER

z Installation must be done in accordance with this installation manual. Improper installation may result in water leakage, electric

shock or fire.

z Install the air conditioner on a foundation strong enough that it can withstand the weight of the unit. A foundation of insufficient

strength may result in the unit falling and injury.

z Do not perform installation at locations subject to existence or entry of flammable gas.

z Do not climb or put any object on the air conditioner to prevent injury caused by the unit falling.

z In the event of refrigerant leakage, immediately turn off the fire source (e.g. stoves), wipe the refrigerant off the floor, open the

door and windows for ventilation and then contact the service personnel or the dealer.

IMPORTANT:

READ AND UNDERSTAND

THIS MANUAL BEFORE

USING THIS HEAT-PUMP

AIR CONDITIONER.

KEEP THIS MANUAL FOR

FUTURE REFERENCE.



66MP1373

Before installation,

please read this manual

carefully and keep it properly.

2

DANGER

z Use the adequate non-flammable refrigerant (R410A) and refrigerant oil (Idemitsu Kosan Co.,Ltd.)(FVC68D) to the outdoor

unit in refrigerant cycle. Charging other refrigerant or refrigerant oil, oxygen, acetylene into the refrigerant cycle may result

in explosion or fire.

z This air conditioner contains high pressure gas, in any case, the unit or any part of the unit is prohibited to be heated. It may

result in machine malfunction, even explosion or fire.

1. Common Items

(1) Confirmation of unit model

1) Base unit

HP 8 10 12 14 16 18

Model RAM-8MQ(D) RAM-10MQ(D) RAM-12MQ(D) RAM-14MQ(D) RAM-16MQ(D) RAM-18MQ(D)

2) Combination of Base Units

HP 20 22 24 26 28

Model RAM-12MQ(D) RAM-10MQ(D) RAM-14MQ(D) RAM-14MQ(D) RAM-14MQ(D) RAM-14MQ(D)

RAM-8MQ(D) RAM-10MQ(D) RAM-8MQ(D) RAM-10MQ(D) RAM-12MQ(D) RAM-14MQ(D)

HP 30 32 34 36 38 40

Model

RAM-16MQ(D) RAM-16MQ(D) RAM-12MQ(D) RAM-12MQ(D) RAM-16MQ(D) RAM-16MQ(D)

RAM-14MQ(D) RAM-16MQ(D) RAM-12MQ(D) RAM-12MQ(D) RAM-12MQ(D) RAM-12MQ(D)

— — RAM-10MQ(D) RAM-12MQ(D) RAM-10MQ(D) RAM-12MQ(D)

HP 42 44 46 48 50 52

Model

RAM-16MQ(D) RAM-18MQ(D) RAM-18MQ(D) RAM-18MQ(D) RAM-18MQ(D) RAM-18MQ(D)

RAM-14MQ(D) RAM-14MQ(D) RAM-14MQ(D) RAM-16MQ(D) RAM-18MQ(D) RAM-18MQ(D)

RAM-12MQ(D) RAM-12MQ(D) RAM-14MQ(D) RAM-14MQ(D) RAM-14MQ(D) RAM-16MQ(D)

HP 54

Model

RAM-18MQ(D)

※：For 20~54HP, please refer to the table above to select the combination of base units.

(2) Combination of Indoor Unit and Outdoor Unit

Please refer to the table, select outdoor unit and indoor unit number and capacity.

(When the indoor unit does not fit " Minimum Individual Operation Capacity " in the table as shown below, It must not be

connect to the outdoor unit. Please pay particular attention!)

HP Indoor Unit

Range of

Combination Capacity

Maximum Connectable

Indoor Unit Number

The Suggestion of

Maximum Connectable

Indoor Unit Number※

8

Max. 130%

13 8

10 16

10

12 19

14 23

16

16 26

18

20 33 18

22 36 20

24 40

26

26 43

28 47

32

30 50

32 53

34 56

36 59

38~54 64 38

※ ：Please refer to piping connection limit on P.9.

3

(1) Operation temperature range

Item Air Inlet Temperature of Outdoor Unit Air Inlet Temperature of Indoor Unit (Non-room Temperature)

Cooling -5℃DB ～ 43℃ DB 21℃DB/15℃WB ～32℃ DB/23℃ WB

DB：Dry Bulb WB：Wet Bulb

(2) When transporting the outdoor unit, observe the following items. Please transport the unit to the installation location under

packed condition.

(3) When hanging the outdoor unit, please follow the description of the label attached to the outdoor unit. After removing the

package, in order to avoid body damage, the unit needs protecting by corrugated board or cloth if moving again.

●When hanging outdoor unit, please do not tie the ropes on wooden base or the inside of hanging square holes.

Example：RAM-8MQ(D)

2. Transportation and Handling

木台

吊掛孔

錯誤

吊掛孔

繩索繩索

正確

繩索位置

錯誤

繩索

CORRECT INCORRECT

INCORRECT

Rope

Wooden Base

Rope Rope

Square

Hole

Square

Hole

Corrugated Paper Frame

Do not remove corrugated

paper and plastic bands.

Do not apply any force to

this place.(Both Sides)

Rope

Wooden Base

Angle of ropes is more

than 60°.

Plywood or splint

thickness should

be more than 15mm.

Apply rope through the

square holes.

Corrugated Paper Frame

Do not apply any force to

this place.(Both Sides)

Do not remove corrugated

paper and plastic bands.

Angle of ropes is more

than 60°.

Rope

Plywood or splint

thickness should

be more than 15mm.

Apply rope through the

square holes.

4

3. Before Installation

(1) The pressure of refrigerant R410A is 1.4 times higher than conventional refrigerant; it is contaminated easily by moisture,

oxide, oil and other impurities. New refrigerant is adopted; therefore refrigerant oil also needs to be changed. When

installing, make sure to prevent moisture, oxide, oil, conventional refrigerant or refrigerant oil, or other impurities from

getting into the refrigerant cycle.

(2) To avoid accidental mixing of different refrigerant or different refrigerant oil, the size of the charging connectors must be

changed. It is necessary to prepare the following special R410A tools before performing the installation work.

Measuring instrument or tool which is directly contact to refrigerant must be used only for refrigerant R410A.

Symbol Description：○：For new and old type refrigerant □：Only for R410A(not for R22)

●：Only for R407C(not for R22) ※：For both R410A and R407C

Measuring Instrument and Tool

Interchangeability

with R22

Reason of Non-Interchangeability and Attention

(only for new refrigerant)

(◎Strictly Required)

Use

R407C R410A

Refrigerant

Pipe

Pipe Cutter ○ ○ Cutting Pipe；

Removing Burrs

Flaring Tool ○ ○□ To ensure the high pressure of R410A,‧ if using flaring

tube, make dimension of tube larger for R410A. If

you continue to use existent products, shall be used

with the flaring tube adjustment gasket (1mm).

(R410A special flaring tool can be used directly in the

R407C)

Flaring for Tubes

Refrigerant

Pipe

Extrusion

Adjustment

Gauge

─

(not use)

□

Dimensional Control

for Extruded Portion

if Tube after Flaring

Pipe Bender ○ ○ ‧If using the 1/2H pipe, it can not be processed.

Please use the elbow welding to connect. Bending

Expanding Tool ○ ○ ‧If using the 1/2H pipe, it can not be processed.

Please use the elbow welding to connect. Expanding Tubes

Torque Wrench ○

□ R410A forΦ12.7‧、Φ15.88; spanner size is up 2mm;

existent products can not be used. Connection of Flare Nut

○ ‧For Φ6.35、Φ9.53、Φ19.05;

spanner size is the same.

Brazing Tool ○ ○ ‧Perform correct brazing work. Brazing for Tubes

Nitrogen Gas ○ ○ ‧Strict control against contamination.

(Blow nitrogen during brazing)

Prevention from Oxidation

during Brazing

Lubrication Oil

(for Flare

Surface)

● □

Use a synthetic oil(FVC68D) which is equivalent‧

to the oil used in the refrigerant cycle.

Do not use R22 with mineral oil‧, and products must

be used the same synthetic oil.

Synthetic oil absorbs moisture quickly. Do not place ‧

it in the humid environment.

Applying Oil to the Flared

Surface

Vacuum

Drying

Refrigerant

Change

Refrigerant

Cylinder

●

(Brown)

□

(Pink)

‧Check refrigerant cylinder color.

(R410A:Pink)、(R407C:Brown)

◎Refrigerant must be charged in a state of liquid.

(Charging in a state of gas is strictly prohibited.)

Refrigerant Charging

Vacuum Pump ○ ○ ◎The conventional ones are applicable. However,

it is required to mount a vacuum pump adapter

which can prevent from reverse flow when a

vacuum pump stops.

Vacuum Pumping

Adapter for

Vacuum Pump

(prevent from

reverse)

※● □

Manifold Valve ● □ ‧No interchangeability is available due to higher

pressure when compared with R22.

R410A connection diameter：1/2 UNF

R407C connection diameter：7/16 UNF

◎＜ Do not use conventional ones (R22) to the

different refrigerant ＞; If used, mineral oil will

flow into the cycle and cause sludge, resulting in

clogging or compressor failure.

Vacuum Pumping;

Vacuum Holding;

Refrigerant Charging

and Check of Pressures

Charging Hose ● □

Charging Cylinder Prohibited Please use the ‧weight scale. Refrigerant Charging

The ai

r

-ti

g

ht test

p

ressure of the

p

roduct is 4.15M

p

a.

5

+0

-0.4

Weight Scale ○ ○ Measuring Instrument for

Refrigerant Charging

Refrigerant Gas

Leakage Detector ※● □ ‧The current gas leakage detector(R22) is not

applicable due to different detecting method. Gas Leakage Check

(3) The piping and connection parts use the following R410A. Flare nut and the front of pipe flare size also changes as shown

in the table below.

Unit：mm

●Pipe thickness selected

Unit：mm

Diameter R410A

Thickness Material

¯6.35 0.8 O

¯9.53 0.8 O

¯12.7 0.8 O

¯15.88 1.0 O

¯19.05 1.0 1/2H

¯22.2 1.0 1/2H

¯25.4 1.0 1/2H

¯28.6 1.0 1/2H

¯31.75 1.1 1/2H

¯38.1 1.35 1/2H

¯41.3 1.20 1/2H

¯44.45 1.55 1/2H

●Selection of joints

With the design pressure changes, the connection pipe (elbow etc.) thickness are also changes. When using 1/2H

material, the bending and flaring can not be processed, so please follow the table below to choose the minimum

thickness that appropriate to the connecting pipe. Please note that there are several changes in flare nut size.

Connection minimum thickness (mm)

Diameter R410A Diameter R410A

¯6.35 0.5 ¯25.4 0.95

¯9.53 0.6 ¯28.6 1.0

¯12.7 0.7 ¯31.75 1.1

¯15.88 0.8 ¯38.1 1.35

¯19.05 0.8 ¯41.3 1.45

¯22.2 0.9 ¯44.45 1.55

Flare Nut dimension B (mm)

Diameter Flare Nut dimension B(mm) Diameter Flare Nut dimension B(mm)

R410A R410A

¯6.35 17 ¯15.88 29

¯9.53 22 ¯19.05 36

¯12.7 26

Diameter ¯d Dimension ¯A

R410A

¯6.35 ¯9.1

¯9.53 ¯13.2

¯12.7 ¯16.6

¯15.88 ¯19.7

¯19.05 ※Can not be processed

(1/2H material)

Flare Nut

Pipe Flare Size

6

Season

winds

A

ir inlet

If the season

winds blows

directly,

defrost time

will increase.

Season

winds

A

ir inlet

A

ir inlet

A

ir inlet

Windbreak

4. Installation Work

(1) Selection of Installation Location

1) Make sure the space for operation and maintenance service is secured around the outdoor unit.

2) Install the outdoor unit where it is dry and well ventilated.

3) Install the outdoor unit where it is in the shade or it will not be exposed to direct sunshine or direct radiation from high

temperature heat source.

4) Install the outdoor unit where the operating sound does not affect neighbors.

5) The outlet air does not directly blow to plants or neighbor’s windows.

6) The foundation is strong enough to support the weight and withstand vibrations of the outdoor unit.

7) Do not install the outdoor unit where dust or other contamination could block the heat exchanger of the unit.

8) Do not install the outdoor unit where strong wind could blow to the unit from the air outlet side.

9) Do not install the unit inside the house.

10) Do not place flammable objects near the unit, it may result in fire.

11) Do not install the outdoor unit where there is a high concentration of oil spray, salty air or harmful gases such as sulfurous

gas.

12) Do not install the outdoor unit where the electromagnetic wave directly radiates to the electrical box.

13) To avoid the influence of electromagnetic waves, wave generating machines such as radio should be kept 3 meters from

electromagnetic wave radiator.

(2) Installation Space

1) Ensure the maintenance space around the outdoor unit as shown below. The insufficient air inlet and outlet space may

result in insufficient air intake, poor performance, and other problems. Please be sure to follow it for the convenience of

maintenance.

If the wall of front side is higher than 1,500 mm, the required space is 500＋h2/2mm.

If the wall of rear side is higher than 500 mm, the required space is 300＋h1/2mm.

●If there are no walls at the front and rear side, the required spaces for the front and

rear side are 500 mm and 300 mm.

●If the unit is surrounded by walls, make a ventilation hole on the wall.

●Leave space between the top side and wall.

2) Leave the service space when outdoor unit is installed

　1.Walls in 2 Directions

　2.Walls in 3 Directions

＜Single Unit Installation＞

Windbreak

Fence

Unit:mm

7

＜Multiple Unit Installation＞

3.Walls in 4 Directions

＜Single Unit Installation＞

＜Multiple Unit Installation＞

●Keep the upper side open.

●The front side should be less than 1,500mm; air inlet side should be less than 500mm; other sides are no limits.

●If the heights are beyond the limits, add h1/2mm and h2/2mm on the front side and air inlet side respectively.

●For the multiple installation, one group allows 6 outdoor units(max.).The required space between each set is at least

1m.

●The walls should be partially open if the unit is surrounded by walls in four directions.

Note：If the distance between unit and obstacles/ceilings is less than 1,500mm or the space is closed, set up the

duct on the air outlet side to prevent the return air.

Unit：mm

8

(3) Foundation Work

Please perform this work properly. Ensure the unit does not lean, vibrate, make a noise or fall in the event of strong wind or

earthquake.

1) The height of the base should be 150 mm higher than the ground level.

2) Perform adequate drainage around the foundation.

3) All foot of the outdoor unit need installing on the base.

4) Install the outdoor unit horizontally (Use a level gauge). Ensure the horizontal tolerance is within 10mm.

5) Precautions

The concrete base should be set along the foot direction as shown below. Incorrect installation may cause the foot of the

outdoor unit deformation.

(4) Anchor Bolt Installation Dimensions

RAM-8~12MQ(D) RAM-14~18MQ(D)

Unit：mm

(5) Confirmation of drainage

1) When Defrosting operate, the condensation water will be discharged. Select the best area for drainage.

The drain hole position is shown below：

RAM-8MQ(D)~12MQ(D) RAM-14MQ(D)~18MQ(D)

Refrigerant Gas Piping

Connection Hole (¯60) Refrigerant Liquid Piping

Connection Hole

(

¯47

)

Circuit Control Connection

Hole (¯26x2)

Drain Hole (¯26)

Drain Connector

Position

Unit：mm

Hole of Anchor Bolt Hole of Anchor Bolt

4-38x15 4-38x15

Refrigerant Gas Piping

Connection Hole (¯60) Refrigerant Liquid Piping

Connection Hole

(

¯

47

)

Circuit Control Connection Hole (¯26x2)

Drain Hole (¯26)

Drain Connector Position

Power Su

pp

l

y

Connection Hole

(

¯

52

)

Power Su

pp

l

y

Connection Hole

(

¯

52

)

9

2) Drain connector installation methods:

　1.Set the washer on the upper part of drain connector.

　2.According to the shape of base drain holes, insert

the drain connector and turn it clockwise about 40°.

　3.Drain connector is equivalent to VP20.

　4.Drain pipe is field supplied.

Note：The drain connector is installed

for discharging condensation water

5. Refrigerant Piping

(1) Refrigerant Piping

1) Selection of refrigerant pipes

　1.Please prepare field supplied copper pipes.

　2.Select the piping size as the table below.

3.Select clean copper pipes. Be sure that there is no dust and moisture inside of the pipes.

●Cut the copper pipes with a pipe cutter. Blow the inside of the pipes with nitrogen or dry air to remove dust or foreign

materials before connecting pipes. (Do not use a saw, a grindstone or other tool which may cause cutting powder.)

●Cautions for refrigerant piping

2) Refrigerant piping limitation and multi-kit

　1.The order of piping connection kit is counted from the indoor unit side(as Branch Pipe 1).

　2.When the maximum length of the equivalent refrigerant pipe(L1)from First Multi-kit to the indoor unit is over 100mm, the

size of gas/liquid pipes from the Piping Connection Kit 1 to the First Multi-kit should be increased one size with the

reducer(field-supplied).

　3.The size of multi-kit between the indoor units should be the same as the size of the indoor unit pipes.

　4.When the liquid piping length is longer than 15m, please useφ9.53 pipe(field-supplied).

　5.Keep the straight line distance longer than 500mm or more after the piping connection kit.

　6.The condition of refrigerant piping installation varies depending on the quantity of indoor units.

　7.Due to the maximum charging of refrigerant, the total piping length should be less than 1,000m.

Piping between Outdoor Unit and First Multi-kit

HP

Gas/Liquid Pipe Size (Φmm)

Equivalent Length＜100m Equivalent Length≧100m

8 19.05 / 9.53 22.2 / 12.7

10 22.2 / 9.53 25.4 / 12.7

12~14 25.4 / 12.7 28.6 / 15.88

16 28.6 / 12.7 31.75 / 15.88

18~24 28.6 / 15.88 31.75 / 19.05

26~34 31.75 / 19.05 34.9 / 22.2

36~54 38.1 / 19.05 41.3 / 22.2

配管不可直接放到地上

Convex

Drain Connector

Base Drain

Hole

Washer

Drain Pipe

(Field Supplied)

Drain Connector

When installing pipe through the wall,

secure a cap at the end of the pipe.

CORRECT

CORRECT CORRECT

INCORRECT

Hole Hole

A

ttach a cap or vinyl tape

Do not place the pipe directly on the

ground.

A

ttach a cap or vinyl tape

A

ttach a cap or vinyl bag with rubber

band.

Rain water can enter

CORRECT

10

●Piping Size and Multi-Kit Selection

Example of System :

The figure is an example which shows the combination

of indoor and outdoor units.

The refrigerant pipes which contain gas/ liquid

pipes are shown in single lines for simplification.

Item

Allowable length

The number of indoor unit is

less than the recommended

maximum combined number

of units.

The number of indoor unit

exceeds the recommended

maximum combined number

of units.

Maximum Piping

Length

Actual length L 1≦165m

Equivalent length※ L 1≦190m

Total length L t≦1000m L

t≦300m

Maximum Piping

Length

Length between First Multi-kit and the

furthest indoor unit L 2≦90m L

2≦40m

Length between each Multi-kit and Each

indoor unit L 3≦40m L

3≦30m

Length between Piping Connection Kit 1 and

the furthest outdoor unit L 5≦10m

Maximum Height

Difference

between Outdoor

and Indoor Unit

If the outdoor unit is higher than indoor unit. H 1≦50m

If the indoor unit is higher than outdoor unit. H 1≦40m

Height difference between Each indoor unit H 2≦15m

Height difference between Each outdoor unit H 5≦0.1m

Multi-kit and Piping

First Multi-kit

Outdoor Unit

(HP)

Gas/Liquid

Piping

Diameter

(¯mm)

(L 1 ＜ 100m)

Gas/Liquid

Piping

Diameter

(¯mm)

(L 1 ≧ 100m)

Multi-Kit Type

8 19.05 / 9.53 22.2 / 12.7 E-NP282S

10 22.2 / 9.53 25.4 / 12.7

12~14 25.4 / 12.7 28.6 / 15.88 E-NP452S

16 28.6 / 12.7 31.75 / 15.88

18~24 28.6 / 15.88 31.75 / 19.05 E-NP692S

26~34 31.75 / 19.05 34.9 / 22.2

E-NP902S

36~54 38.1 / 19.05 41.3 / 22.2

Other Multi-kits

Indoor Unit Total

Capacity (kW)

Gas/Liquid Piping Diameter

(¯mm) Multi-Kit Type

≧101.0 38.1 / 19.05 E-NP902S

73.0~100.9 31.75 / 19.05

50.0~72.9 28.6 / 15.88 E-NP692S

45.0~49.9 28.6 / 12.7 E-NP452S

33.5~44.9 25.4 / 12.7

25.0~33.4 22.2 / 9.53

E-NP282S

16.0~24.9 19.05 / 9.53

≦15.9 15.88 / 9.53

※Equivalent length= Actual length+ Additional length(Elbow, Bend and Multi-Kit)

‧One 90°Elbow is 0.5m.

‧One 180°Bend is 1.5m.

‧One Multi-Kit is 0.5m.

室內機

分歧管 1 分歧管 2

第一分歧管

室內機室內機

室內機室內機室內機

Master (A) Slave (C)

Slave (B)

First

Multi-Kit

Piping

Connection Kit 1 Piping

Connection Kit 2

Indoor Indoor Indoor

11

●Piping diameter restriction between Multi-Kit and indoor units:

Piping Diameter

Indoor Unit

Capacity (kW)

Gas/Liquid Piping Diameter (¯mm)

2.2~4.5 12.7 / 6.35※

5.0~5.6 15.88 / 6.35※

6.3~16.0 15.88 / 9.53

※：When piping length exceeds 15m, liquid piping diameter must change to Φ9.53.

●Piping diameter restriction on indoor units:

Model RAM-8MQ(D) RAM-10MQ(D) RAM-12MQ(D) RAM-14MQ(D) RAM-16MQ(D)

RAM-18MQ(D)

Piping

Size

a≧100m Gas Piping 22.2 25.4 28.6 31.75

Liquid Piping 12.7 15.88 19.05

a≦100m Gas Piping 19.05 22.2 25.4 28.6

Liquid Piping 9.53 12.7 15.88

HP 20 20 22 24 26 28 30 32

Combination

Model

Master (A) 10MQ(D) 12MQ(D) 14MQ(D) 14MQ(D) 14MQ(D) 14MQ(D) 16MQ(D) 16MQ(D)

Slave (B) 10MQ(D) 8MQ(D) 8MQ(D) 10MQ(D) 12MQ(D) 14MQ(D) 14MQ(D) 16MQ(D)

Piping Connection Kit E-NP692S E-NP902S

Piping

Size

a≧100m

Gas

Piping 31.75 34.9

Liquid

Piping 19.05 22.2

a≦100m

Gas

Piping 28.6 31.75

Liquid

Piping 15.88 19.05

b

Gas

Piping 22.2 25.4 28.6

Liquid

Piping 9.53 12.7

c

Gas

Piping 22.2 19.05 22.2 25.4 28.6

Liquid

Piping 9.53 12.7

Slave (B) Slave (B) Master (A)

Master (A)

Outdoor Unit

12

HP 34 36 38 40 42 44 46 48 50 52 54

Combination

Model

Master (A) 12MQ(D) 12MQ(D) 16MQ(D) 16MQ(D) 16MQ(D) 18MQ(D) 18MQ(D) 18MQ(D) 18MQ(D) 18MQ(D) 18MQ(D)

Slave (B) 12MQ(D) 12MQ(D) 12MQ(D) 12MQ(D) 14MQ(D) 14MQ(D) 14MQ(D) 16MQ(D) 18MQ(D) 18MQ(D) 18MQ(D)

Slave (C) 10MQ(D) 12MQ(D) 10MQ(D) 12MQ(D) 12MQ(D) 12MQ(D) 14MQ(D) 14MQ(D) 14MQ(D) 16MQ(D) 18MQ(D)

Piping Connection Kit E-NP902S×2

Piping

Size

a≧100m

Gas

Piping 34.9 41.3

Liquid

Piping 22.2

a≦100m

Gas

Piping 31.75 38.1

Liquid

Piping 19.05

b

Gas

Piping 28.6 31.75

Liquid

Piping 15.88 19.05

c

Gas

Piping 25.4 28.6

Liquid

Piping 12.7 15.88

d

Gas

Piping 25.4 28.5

Liquid

Piping 12.7 15.88

e

Gas

Piping 22.2 25.4 22.2 25.4 28.6

Liquid

Piping 9.53 12.7 9.53 12.7 15.88

●Please follow the requirement when performing multi-kit piping. Remove the spare parts of pipes can ensure operational

capacity and prevent noise.

Type E-NP282S E-NP452S

Gas

Piping

Q’ty 1 1

Master (A) Master (A)

Slave (B) Slave (C) Slave (B)

Slave (C)

13

底座

前後框

回油彎折高度

200mm以上

回油彎折高度

200mm以上

回油彎折高度

200mm以上

300mm以下

連接至室內機

300mm以下

Liquid

Piping

Q’ty 1 1

Type E-NP692S E-NP902S

Gas

Piping

Q’ty 1 1

Liquid

Piping

Q’ty 1 1

(2) Caution about Outdoor Unit Installation

　1.Align the outdoor units and locate large capacity Master (A) on the indoor unit side. Piping length between Piping

Connection Kit 1 and each outdoor unit should be less than 10m.

　2.Place the piping connection kit lower than the outdoor unit piping connection.

In case that the piping connection kit is placed higher than the outdoor unit piping connection, keep 300mm (max.)

between the piping connection kit and the bottom of the outdoor unit. Also, provide an oil trap (min.200mm) between the

piping connection kit and the outdoor unit.

分歧管

室外機

各室外機間高度

差

連接

至

室內機

LL

Pi

p

in

g

Len

g

th：L

A

≦

LB

≦

LC

≦

10m

Master

(A)

Slave

(B)

Slave

(C)

L

HP：Master

(

A

)

≧

Slave

(

B

)

≧

Slave

(

C

)

0.1m

以

Indoor Unit Side

Piping

Connection

Kit

Keep the pipes straight at least 0.5m

after piping connection kits.

Max. Lift Difference

between Outdoor

Unit = 0.1m

Master

(A)

Slave

(B)

Slave

(C)

Indoor Unit Side

Oil Trap

Min. 200mm

Max.300mm Max.300mm

Max.300mm

Base

Bottom of

Outdoor Uni

t

Oil Trap

Min. 200mm

Oil Trap

Min. 200mm

14

連接至室內機

冷涷油囤積

連接至室內機

2m以下

回油彎折高度

200mm以上

2m以上

2m以下

連接至室內機

2m以下

連接至室內機

2m以上

2m以下

回油彎折高度

200mm以上

15

。

以內

(親機) (子機)

室外機室外機

(子機)

室外機

連接至室內機

500mm以上

室外機

1/3

室外機

2/3

室外機

3/3

Gas Piping

(Field Supplied)

Piping Connection

Kit 1

(

Gas

)

Outdoor 1/3

Outdoor 2/3

Outdoor 3/3

Gas Piping

Liquid Piping

Gas Piping

Piping Connection

Kit 2

(

Gas

)

Piping Connection

Kit 1

(

Li

q

uid

)

Piping Connection

Kit 2

(

Li

q

uid

)

Liquid Piping

(Field Supplied)

(Field Supplied) (Field Supplied)

Piping Connector

(L-Shape)

Piping Connector

(L-Shape)

Piping Connector

(L-Shape)

Piping Connector

(L-Shape)

(Field Supplied)

Outdoor 1/3

＜Front or Rear Side Pi

p

in

g

Connection＞

冷媒液配管連接口

冷媒氣配管連接口(高壓)

　3.Piping length between piping connection kit (at outdoor unit side) and outdoor unit should be less than 2m.

In case that the piping length between outdoor units exceeds 2m, an oil trap (min.200mm) should be provided

for the gas pipe so that accumulation of refrigerant oil may not occur.

　4.Ensure the direction of outdoor unit pipes is horizontal or with downward gradient towards the indoor unit side to

avoid accumulating refrigerant oil in the pipe.

　5.For maintenance, if the pipe is placed in front of the outdoor unit,

secure at least 500mm between the outdoor units and the piping connection kits.

　6.Place the piping connection kits horizontally (within ±15°).

　7.Piping connection of outdoor unit, please refer to the following figure.

Indoor Unit Side Indoor Unit Side

Indoor Unit Side

Within±15°

≧500mm

Master

(A)

Slave

(B)

Refrigerant oil

accumulates in the pipe.

Less than 2m Less than 2m

2m or more 2m or more

Oil Trap

Min. 200mm Oil Trap

Min. 200mm

＜Outdoor Unit＞

Gas Line Refrigerant Piping

Connection

Liquid Line Refrigerant

Piping Connection

Master

(A)

Slave

(B)

Slave

(C)

Master

(A)

Slave

(B)

Slave

(C)

Master

(A)

Slave

(B)

Slave

(C)

Master

(A)

Slave

(B)

Slave

(C)

Slave

(

C

)

(F

15

冷媒液配管連接口(高壓)

D 冷媒液配管連接口

C 冷媒氣配管連接口

A 冷媒氣配管連接口

B 冷媒液配管連接口

245

145

100

冷媒液配管連接口

室外機

1/3

室外機

2/3

室外機

3/3

分歧管

2(

液配管

)

2( )

Outdoor 1/3

Outdoor 2/3

Outdoor 3/3

Gas Piping

Liquid Piping

Gas Piping

Liquid Piping

Piping Connector

(Z-Shape)

Piping Connector

(Z-Shape)

Piping Connector

(L-Shape)

Piping Connector

(L-Shape)

(Field Supplied)

(Field Supplied) (Field Supplied)

Piping Connection

Kit 1

(

Gas

)

Piping Connection

Kit 2

(

Gas

)

Piping Connection

Kit 1

(

Li

q

uid

)

Piping Connection

Kit 2

(

Li

q

uid

)

Gas Line Refrigerant Piping

Connection

Liquid Line Refrigerant

Piping Connection

＜Downward Piping Connection＞

(3) Pipe Connection Position

Model

A B C D

Gas Line Refrigerant

Piping Connection

Liquid Line Refrigerant

Piping Connection

Gas Line Refrigerant

Piping Connection

Liquid Line Refrigerant

Piping Connection

RAM-8MQ(D)

150 155

320

335

RAM-10MQ(D)

315

RAM-12MQ(D)

RAM-14MQ(D)

170 175

RAM-16MQ(D)

RAM-18MQ(D)

Unit:mm

D

C

100

A

B

16

室外機

第

1

分歧

第

2

分歧

第

3

分歧

最佳安裝狀況

容許安裝狀況

第

1

分歧

第

2

分歧

第

3

分歧

室外機

錯誤

室外機

第

1

分歧

第

2

分歧

第

3

分歧

第

4

分歧

錯誤

第 1 主分歧

第

2主

分歧

第 1 主分歧

第

1

分歧

第

2

分歧

第

3

分歧

室外機

第

2

主分歧

室外機

第 1 主分歧

第

2

主分歧

第

2

主分歧

第 1 主分歧

(4) Setting of the multi-kit pipe

●It is necessary to use optional multi-kit to prevent unit’s insufficient capacity due to the uneven distribution of

the refrigerant. Do not use connectors to connect.

1) The installation of the main branch as shown below

‧〝〞：Main Pipe (The pipe between each multi-kit or the pipe between the outdoor units and the first multi-kit)

‧Main Branch：One multi-kit is connected with other multi-kits connected with more than one indoor unit.

‧Setting Condition：The branches extending to third are allowed, but main branches can only extend to second.

　Piping length within 40 m between the first branch and the indoor units :

　Piping length in excess of 40 m between the first branch and the indoor units

‧Only one main branch is allowed, and total indoor unit capacity should be in the range of 40% to 60% for each

route after the first main branch.

Indoor

Unit Total

Capacity

50%

Indoor

Unit Total

Capacity

50% 71Type

71Type

y

71Type

Indoor

Unit Total

Capacity

33%

Indoor

Unit Total

Capacity

67%

140Type

71Type

140Type

第

3

分歧

第

2

主分歧

Best installation situation

A

llowing installation situation

Outdoor

Outdoor Outdoor Outdoor

A

llowing installation situation

A

llowing installation situation

A

llowing installation situation

First Main Branch

First Main Branch First Main Branch

First Main Branch First Main Branch First Main Branch

Second Main Branch

First Branch

Second Branch

Second Branch Second Branch

Second Main Branch

First Branch

Third Branch Third Branch

Third Branch

Fourth Branch

Pi

p

e Len

g

th 40m~90m Pi

p

e Len

g

th 40m~90m

Incorrect

17

[支撐方法例]

直管部

0.5m 以上

直管部

0.5m 以上

2) Fixed the multi-kit piping

1.Horizontal

‧The branch pipe must be set in the same plane.

‧Keep the outdoor unit pipes straight at least 0.5m after piping connection kits.

　2.Vertical

‧Upward Branch：Keep the outdoor unit pipes straight at least 0.5m after piping connection kits.

‧Downward Branch：Keep the outdoor unit pipes straight at least 0.5m after piping connection kits.

(5) Refrigerant piping fixation methods:

Connect the indoor unit and the outdoor unit with field-supplied refrigerant piping. Fix the refrigerant piping at certain points

and prevent the refrigerant piping from touching the weak part of the building such as wall, ceiling, etc.( If touched,

abnormal sound may occur due to the vibration of the piping, especially in the case of short length piping.)

(6) Piping Direction

1) The pipes are available to connect in five directions (front, rear, left, right or bottom side) from bottom base.

2) Please weld the flange combination and connection pipe in advance, and then lock with the gas stop valve.

3) In order to prevent rainwater and insects from entering into the unit, please fill the gap between piping hole and pipes with

insulator.

Pipe Size ≦Φ22.2 Φ25.4≦

Max. Interval 1.0m 1.5m

傾斜角度

15

∘

以內

15∘

傾斜角度

底座 (底面側)

下配管後配管

(背面側)

(正面側)

前配管

左配管

(左面側)

右配管

(右面側)

Flange Combination

Bolt 2 Piece

Spring Washer 2 Piece

Flat Washer 2 Piece

A

ttached Washer

Original

Washer

Gas Stop

Val ve Set

Closed Flange

Discard

Flare Nut

Spring Washer 2 Piece

Flat Washer 2 Piece

Right Piping

(Right Side)

Front Piping

(Front Side)

Left Piping

(Left Side)

Base Bottom Piping

(Bottom Side)

Rear Piping

(Rear Side)

Up Up

Down Down

Straight Pipe

0.5m Above

Up

In the same

Horizon Plane

Upward Branch

Downward Branch Tilt Angle

Within 15°

Tilt Angle

(A Direction)

Outdoor Unit

Indoor Unit

(Fixation Methods Example)

Piping Fixation Interval

18

●Use special tools and measuring instruments only for the new refrigerant R410A.

●If vacuum degree -0.1MPa is not available, it is considered that leakage and moisture exist.

(7) Refrigerant Piping Work

1) Confirm that the stop valves of outdoor unit are closed.

2) Connect the indoor unit and the outdoor unit with field-supplied refrigerant piping. Fix the refrigerant piping at certain points

and prevent the refrigerant piping from touching the weak part of the building such as wall, ceiling, etc.( If touched,

abnormal sound may occur due to the vibration of the piping, especially short length piping.)

3) Please connect the piping between indoor and outdoor unit. When tightening the joints of piping, coat inside and outside of

flare piping with a layer of refrigerant oil [Field-supplied (Idemitsu Kosan Co., Ltd. Synthetic oil”FVC68D”)], and use double

spanner to tighten with specific tightening torque. After tightened, please confirm the gas leakage once more. During

brazing, please blow nitrogen into the piping.

4) Before air-tight test, please re-tighten the gas line stop valve spindle.

(a) After flange connection, open the gas line stop valve cap and tighten the spindle with 20 ~ 25 N • m of torque.

(b) Removing the valve cap will cause voice due to slight gas leakage, but the condition is normal.

5) Please perform the air-tight test.

Connect the gauge manifold using charging hoses with a vacuum pump or a nitrogen cylinder to the check joints of the

liquid line and the gas line stop valves. Perform the air-tight test. Apply gas pressure of 4.15MPa.

6) Insulate the unions and flare-nuts at the piping connections completely. Insulate the liquid piping and gas piping completely

to avoid decreasing performance and dewing on the surface of the pipe.

Required Torque：

(8) Vacuum Work

About the details of stop valve operation, please refer to the nameplate inside service cover.

1) Connect a manifold gauge to the check joints at the both sides. Continue vacuum pumping work until the pressure

reaches-0.1MPa or lower for one to two hours. After vacuum pumping work, shut the manifold valve, stop the vacuum

pump and leave it for one hour. Check to ensure that the pressure in the manifold gauge does not increase.

2) Because check joints and flare nut cannot be connected, please use the charging hoses. After the work, please tighten the

flare nut with 15~16N • m torque.

3) Vacuum drying determination example：

Piping Size (mm) Tightening Torque

¯6.35(1/4”) 20N˙m

¯9.53(3/8”) 40N˙m

¯12.7(1/2”) 60N˙m

¯15.88(5/8”) 80N˙m

¯19.05(3/4”) 100N˙m

Flange With Bolt 53~75 N˙m

Please implement vacuum drying determination, to confirm whether moisture exists within the system. If moisture is

present, please extend the vacuum time or install the drying filter until no moisture is present within the system. Be sure

to do this work, otherwise the unit may be damage easily and difficult to handle.

Vacuum Degree

Vacuum Time (min)

Figure1：Vacuum Time and Vacuum Degree

Outside air temperature 23°C

Vacuum pump stop

After the vacuum pump

stop, the vacuum degree

rebound phenomenon

Vacuum Degree

Figure2： Vacuum time and degree with moisture in system

Outside air temperature 20°C

System with

moisture

System without

moisture

Vacuum Degree

Vacuum Time (min)

Figure3：Outside air temperature vacuum time and degree

System with

moisture, outside air

temperature 20°C

System with

moisture, outside air

temperature 10°C

The system without moisture is not

affected by outside air temperature.

(

Double spanner work Stop valve tightening work

Do not apply the double spanner work here.

(Refrigerant leakage will occur)

Vacuum Time (min)

19

(9) The Additional Refrigerant

Outdoor unit has been filled with refrigerant, but still need to add an appropriate amount of refrigerant based on the length

of the pipe.

Please follow the steps below to calculate the additional amount of refrigerant, and fill the outdoor unit with it.

Note:

‧W0 is outdoor unit ref. charge before shipment.

‧In case of the combination of the base unit, calculate

the total ref. charge before shipment of the outdoor

units to be combined.

<Max. Additional Refrigerant Charge Quantity>

Outdoor Unit RAM-8,10MQ(D) RAM-12MQ(D) RAM-14,16MQ(D) RAM-18MQ(D),

20~24HP 26~54HP

Max. Additional Ref.

Charge Quantity 28.0 36.0 40.0 51.0 63.0

Model W0 Outdoor Unit Ref. Charge(Kg)

RAM-8~10MQ(D) 6.5

RAM-12MQ(D) 7.5

RAM-14MQ(D)

9.0

RAM-16MQ(D)

RAM-18MQ(D) 10.5

＝ W ＋ Wo = 100 kg

1. Calculation of Additional Refrigerant W (kg)

No.

kg

22.2

x1.0kg/unit =

1 W1

19.05

15.88

12.7

9.53

6.35

m

x0.39=

x0.28=

x0.19=

x0.12=

x0.06=

x0.03=

/

kg

W

kg

Refrigerant Content Additional Refrigerant (kg)

A

dditional Amount of Refrigerant for Liquid Pipe W1(kg)

Pipe Size Pipe Length (m) The Amount of

Refri

g

erant Pe

r

Mete

r

Additional Amount

of Refrigerant W1(kg)

Total Amount of Additional Refrigerant for Liquid Pipe

A

dditional Amount of Refrigerant for Indoor Unit W2(kg)

8HP, 10HP each indoor unit needs addition 1 kg of refrigerant.

There is no addition of refrigerant for the unit less than 8HP.

The Total Number of 8HP, 10HP Indoor Unit

A

dditional Amount of Refrigerant W2(kg)

Calculation of Indoor Unit Connection Capacity Ratio

(

Indoor Unit

T

otal Ca

p

acit

y

/ Outdoor Unit Ca

p

acit

y

)

Condition Additional Amount of Refrigerant W3(kg)

Connection Capacity Ratio ≦100% 0.0kg

Connection Capacity Ratio 100 ~ 115% 0.5kg

Connection Capacity Ratio 116 ~ 130% 1.0kg

A

dditional Amount of Refri

g

erant W

(

k

g)

＝

(

W1＋W2＋W3

)

Ref. Charge Amount of O.U Before Shipment (W0) kg

2. Additional Refrigerant Filling Amount Records

Please refer to the following formula to calculate the

total charges of system

Total charges of system ＝

W

＋

W

0

Note:

W0 : Factory refrigerant charging weight.

A

dditional Refrigerant:

System Refrigerant:

A

dditional Refrigerant Date:

W2

W3

W

2

3

4

kg

20

(註1)無論是大室、中室、小室、極小室對於洩漏冷媒量皆以 20kg 來計算。

≦Maximum

p

ermissible concentration

(

k

g

/ m3

)

R410

A

( (0.3k / )

1) Fully open the gas line stop valve.

2) After cooling operation starts, connect the gauge manifold

using charging hoses with a refrigerant charging cylinder

to the check joints of the liquid line stop valve to charge

refrigerant. (Refrigerant charging quantity error tolerance:

±0.5kg around.) In the meantime, the liquid line stop valve

is slightly open.

3) Fully open the liquid line stop valve after completing

refrigerant charge.

4) Please be sure to perform the air-tight test.

5) The check joints on the accumulator is used to fill

refrigeration oil, do not use for other purposes.

(10) Caution of The Refrigerant Leakage

When an air conditioner is installed in a room, in case of refrigerant leakage, refrigerant concentration must not exceed the

maximum permissible concentration.

●The products use non-flammable, non-toxic safe refrigerant R410A. If leakage occurs and gas fills a room, it may cause

suffocation. Especially for multiple indoor units and outdoor units with long-distance piping connection, the amount of

refrigerant is more than individual air-conditioner. So make sure the indoor unit installed in the room, even in case of

refrigerant leakage, the refrigerant concentration should never exceed the maximum permissible concentration.

●Please calculate the refrigerant concentration by the following formula：

The total amount of charged refrigerant (kg)

Room space for each indoor unit (m3)

●If a room’s refrigerant concentration is more than the maximum permissible concentration and the air conditioner still need

to be installed, please choose a treatment method according to the following：

1.Set refrigerant leakage detector alarm and link it to mechanical ventilation devices. (See below) (Cooling capacity per ton

should be more than 0.4 m3/min ventilation capacity. Cooling capacity is shown in following table according to the outdoor

unit capacity.)

2.Set the effective ventilation outlet between adjacent rooms (The outlet area need to be more than 0.15% floor area on the

upper and lower of the door), so that the leakage of refrigerant concentration can drop less than the maximum permissible

concentration.

●New refrigerant R410A product notes:

Since R410A is a non-azeotropic refrigerant, when leakage occurs, the proportion of

mixture will change. Do not charge new refrigerant directly; the whole system must

be re-processed.

Outdoor

Unit

Cooling

Capacity

R410A

冷媒配管作業要領圖

Outdoor Unit

Gas Piping

Liquid Piping

Branch Pipe

Refrigerant Piping Work Diagram

Indoor Unit Indoor Unit

Pipe connection part

union and flare nut, be

sure to do insulation

process.

Nitrogen Bottle (Use

for Brazing and

A

i

r

-Tight Test)

(Note：1) Whether it is a large room, medium room, small room or tiny small room,

the amount of refrigerant leakage is all 30kg.

(Note：2) The concentration must not exceed the maximum permissible concentration

0.3k

g

/ m3.

The total amount of refrigerant within the system: 30kg

Example

Indoor

Outdoor

Large Room

Medium Room

Small Room

Ventilation

Outlet

Refrigerant Pipe

mechanical ventilation devices＋refrigerant

leakage detector alarms devices

Excess or insufficient additional refrigerant will result in

compressor failure or other abnormal conditions, be sure

to charge refrigerant according to the calculated values.

Liquid piping must be insulated. (To prevent poor

performance and low pressure pipe surfaces condensation.)

Be sure to check the refrigerant leakage. If a large amount of

refrigerant leaks, it will cause the following phenomena：

1. Lack of oxygen.

2. Harmful gases would occur if a fire was being used in the

room

.

Liquid Line Stop Valve

Gas Line Stop Valve

Manifold Gauge

Vacuum Pump

Refrigerant

Cylinder (R410A)

Weight Scale

Thermal Insulation

Material Wrapping

Outdoor Unit

Capacity (HP)

Cooling Capacity

(ton)

R410A

8~12 4.11

14~16 6.48

18 6.54

20 8.22

22~26 10.59

28~32 12.96

24 13.02

26 13.08

28~40 14.70

42 14.76

44~46 17.13

48 17.19

50~52 19.56

54 19.62

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Hitachi RAM-8MQ Inverter-Driven Multi-Split System Air Conditioners User manual

Hitachi RAM-8MQ Inverter-Driven Multi-Split System Air Conditioners User manual

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