HITACHI RAM-8MQ Inverter-Driven Multi-Split System Air Conditioners Instruction Manual

RAM-8MQ Inverter-Driven Multi-Split System Air Conditioners

Product Information:
Product Name: Inverter-Driven Multi-Split System Air
Conditioners
Models: 8HP, 10HP, 12HP, 14HP, 16HP, 18HP
Manual: Installation and Maintenance Manual
Product Usage Instructions:
1. Before installation, carefully read and understand the manual
provided. Keep the manual for future reference. 2. Ensure to hand
over this manual to the constructor of the next step and finally
let the customer keep it. 3. Important Notice: – This air
conditioner is designed for common air conditioning for people. Do
not use it for other purposes such as for food, animals, plants,
high precision machines, or work of art. – Do not install the unit
in places filled with mineral oil mist or oil spray (including
machinery oil) or where vapor is produced. Also, avoid installation
in places filled with sulfurous gas such as hot spring areas. –
Avoid installation in places where strong salty wind blows such as
coast regions or in an acid or alkaline environment. – When
installing the unit in a hospital or other facilities where
electromagnetic waves are radiated from medical equipment, ensure
that the electromagnetic wave does not directly radiate to the
electrical box, remote control cable, or remote control switch.
Keep wave generating machines such as radio and medical equipment
at least 3 meters away from the air conditioner to avoid the
influence of electromagnetic waves. – Do not install the unit where
wind directly blows on animals or plants as it could adversely
affect them. – Keep the receiver of the wireless remote controller
away from lighting equipment by at least 1 meter to avoid signal
reception failure. 4. Safety Summary: – Before installation, read
the safety section carefully to install correctly. – The manual
contains a Danger symbol indicating hazardous situations that may
result in death or serious injury if installed incorrectly. Observe
important safety messages. – During the test run after
installation, if any abnormalities are found, explain the correct
methods of usage and maintenance to the customer according to the
user’s manual. Hand over both the installation manual and user’s
manual to customers. 5. Meaning of symbols: – DANGER: Indicates a
hazardous situation that may result in death or serious injury if
not avoided. – Mandatory Symbol: Indicates instructing behavior of
general users. – Mandatory Symbol: Indicates grounding must be
performed for machines with grounding terminal. Indicates
prohibited items. 6. Electrical Works: – Assign an authorized
dealer to perform the electrical work. Improper installation may
result in electric shock. Please follow these instructions
carefully for safe and proper usage of the Inverter-Driven
Multi-Split System Air Conditioners.

Before installation, please read this manual carefully and keep it properly.

INVERTER-DRIVEN MULTI-SPLIT SYSTEM AIR CONDITIONERS
Outdoor Units

IMPORTANT:
READ AND UND ERSTAN D THIS MANUAL BEFORE USIN G THIS HEAT-PUMP AIR CONDITIONER . KE EP THIS M A NUA L FOR FUTURE REFERENCE.

InstallationMaintenance 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
DANGERIndicates 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 for
machine with grounding terminal. Indicate prohibited item.

About Electrical Works

z
z
z z
z DANGER z
z
z

Assign an authorized dealer to perform the electrical work. Please note that if improperly performed by yourself, it may result in electric shock.
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.
Use only specified wires for wirings between units. Incorrect selection of wires also causes fire or electric shock.
Properly fasten the terminals of wirings. Improper fastening the joint of terminals may result in fire, electric shock or the overheated terminals.
Fix the cables securely. External forces on the terminals could lead to a fire.
Installation of an earth leakage breaker (ELB) is necessary. If an ELB is not installed, current leakage may occur.
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.
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
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.
DANGER 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.

66MP1373

1

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.
DANGER 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

Model RAM-8MQ(D)

10

12

14

16

18

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

Model HP

RAM-12MQ(D) RAM-8MQ(D)
30

RAM-10MQ(D) RAM-10MQ(D)
32

RAM-14MQ(D) RAM-8MQ(D)
34

RAM-14MQ(D) RAM-10MQ(D)
36

RAM-14MQ(D) RAM-12MQ(D)
38

Model HP
Model HP
Model

RAM-16MQ(D) RAM-14MQ(D)
— 42 RAM-16MQ(D) RAM-14MQ(D) RAM-12MQ(D) 54 RAM-18MQ(D) RAM-18MQ(D) RAM- 18MQ(D)

RAM-16MQ(D) RAM-16MQ(D)
— 44 RAM-18MQ(D) RAM-14MQ(D) RAM-12MQ(D)

RAM-12MQ(D) RAM-12MQ(D) RAM-10MQ(D)
46 RAM-18MQ(D) RAM-14MQ(D) RAM-14MQ(D)

RAM-12MQ(D) RAM-12MQ(D) RAM-12MQ(D)
48 RAM-18MQ(D) RAM-16MQ(D) RAM-14MQ(D)

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

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

28 RAM-14MQ(D) RAM-14MQ(D)
40 RAM-16MQ(D) RAM-12MQ(D) RAM-12MQ(D)
52 RAM-18MQ(D) RAM-18MQ(D) RAM-16MQ(D)

(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

Maximum Connectable

Combination Capacity Indoor Unit Number

8

13

10

16

12

19

14

23

16 26
18

20

33

22

36

Max. 130%

24

40

26

43

28

47

30

50

32

53

34

56

36

59

38~54

64

Please refer to piping connection limit on P.9.

The Suggestion of Maximum Connectable Indoor Unit Number
8 10
16 18 20 26
32
38

2

2. Transportation and Handling

(1) Operation temperature range

Item Cooling

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

-5 DB 43 DB

21 DB/15 WB 32 DB/23 WB
DBDry Bulb WBWet 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.

ExampleRAM-8MQ(D)

INCORRECT
Rope Wooden Base

CORRECT

Rope SHqouleare

INCORRECT
Rope
Square
Hole

Corrugated Paper Frame Do not remove corrugated paper and plastic bands. Do not apply any force to this place.(Both Sides)
Corrugated Paper Frame
Do not remove corrugated paper and plastic bands.
Do not apply any force to this place.(Both Sides)

Angle of ropes is more than 60°.
Rope
Plywood or splint thickness should be more than 15mm.
Wooden Base
Apply rope through the square holes.
Angle of ropes is more than 60°.
Rope
Plywood or splint thickness should be more than 15mm.
Apply rope through the square holes.

3

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.

The air-tight test pressure of the product is 4.15Mpa.

(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 DescriptionFor new and old type refrigerant

Only for R410A(not for R22)

Only for R407C(not for R22)

For both R410A and R407C

Interchangeability

Reason of Non-Interchangeability and Attention

Measuring Instrument and Tool

with R22

(only for new refrigerant)

Use

R407C R410A

(Strictly Required)

Pipe Cutter

Refrigerant

Pipe

Flaring Tool

Extrusion Adjustment Gauge

(not use)

Pipe Bender

Expanding Tool

Cutting Pipe Removing Burrs

To ensure the high pressure of R410A, tube, make dimension of tube larger

if using flaring for R410A. If

Flaring

for

Tubes

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 Dimensional Control

R407C)

for Extruded Portion

if Tube after Flaring

If using the 1/2H pipe, it can not be processed. Please use the elbow welding to connect.

Bending

If using the 1/2H pipe, it can not be processed. Please use the elbow welding to connect.

Expanding Tubes

Torque Wrench Refrigerant

Pipe

R410A for12.715.88; spanner size is up 2mm; existent products can not be used.

Connection of Flare Nut

For 6.359.5319.05; spanner size is the same.

Brazing Tool Nitrogen Gas
Lubrication Oil (for Flare Surface)
Refrigerant Cylinder

Perform correct brazing work.

Brazing for Tubes

Strict control against contamination. (Blow nitrogen during brazing)

Prevention from Oxidation during Brazing

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 Applying Oil to the Flared

be used the same synthetic oil.

Surface

Synthetic oil absorbs moisture quickly. Do not place

it in the humid environment.

Check refrigerant cylinder color.

(R410A:Pink)(R407C:Brown)

(Brown) (Pink) Refrigerant must be charged in a state of liquid.
(Charging in a state of gas is strictly prohibited.)

Refrigerant Charging

Vacuum Pump

Adapter for

Vacuum Drying

Vacuum Pump (prevent from reverse)

Refrigerant Manifold Valve

Change

Charging Hose

Charging Cylinder

Prohibited

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.
No interchangeability is available due to higher pressure when compared with R22. R410A connection diameter1/2 UNF R407C connection diameter7/16 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.
Please use the weight scale.
4

Vacuum Pumping
Vacuum Pumping; Vacuum Holding; Refrigerant Charging and Check of Pressures
Refrigerant Charging

Weight Scale

Refrigerant Gas Leakage Detector

The current gas leakage detector(R22) is not applicable due to different detecting method.

Measuring Instrument for Refrigerant Charging
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.

Pipe Flare Size

Pipe thickness selected

Diameter
¯6.35 ¯9.53 ¯12.7 ¯15.88 ¯19.05 ¯22.2 ¯25.4 ¯28.6 ¯31.75 ¯38.1 ¯41.3 ¯44.45

Thickness 0.8 0.8 0.8 1.0 1.0 1.0 1.0 1.0 1.1 1.35 1.20 1.55

R410A

Unitmm
Material O O O O
1/2H 1/2H 1/2H 1/2H 1/2H 1/2H 1/2H 1/2H

Diameter ¯d
¯6.35 ¯9.53 ¯12.7 ¯15.88 ¯19.05

Unitmm

Dimension

¯A

+0 -0.4

R410A ¯9.1 ¯13.2
¯16.6
¯19.7 Can not be processed
(1/2H material)

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 ¯6.35 ¯9.53 ¯12.7
¯15.88 ¯19.05 ¯22.2

R410A 0.5 0.6 0.7 0.8 0.8 0.9

Diameter ¯25.4 ¯28.6 ¯31.75 ¯38.1 ¯41.3 ¯44.45

R410A 0.95 1.0 1.1 1.35 1.45 1.55

Flare Nut

Flare Nut dimension B (mm)

Diameter
¯6.35 ¯9.53 ¯12.7

Flare Nut dimension B(mm) R410A 17 22 26

Diameter
¯15.88 ¯19.05

Flare Nut dimension B(mm) R410A 29 36

5

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.

Unit:mm

If the season winds blows directly, defrost time will increase.

Season winds
Air inlet

Season winds

WWiFinneddnbbcrreeeaakk

Air inlet Air inlet

Air inlet

If the wall of front side is higher than 1,500 mm, the required space is 500h2/2mm.
If the wall of rear side is higher than 500 mm, the required space is 300h1/2mm.
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

Unit:mm

2.Walls in 3 Directions Single Unit Installation
6

Multiple Unit Installation
3.Walls in 4 Directions Single Unit Installation Multiple Unit Installation

Unitmm

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. NoteIf 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.
7

(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.
   Unitmm

2. 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)

4-38×15 Hole of Anchor Bolt
(5) Confirmation of drainage

Unitmm

4-38×15 Hole of Anchor Bolt

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)

Drain Hole (¯26) Drain Connector Position
Refrigerant Gas Piping Connection Hole (¯60)

Power Supply Connection Hole (¯52)

Circuit Control Connection Hole (¯26×2)
Refrigerant Liquid Piping Connection Hole (¯47)

Refrigerant Gas Piping Connection Hole (¯60)

8

Drain Hole (¯26) Drain Connector Position Power Supply Connection Hole (¯52)
Circuit Control Connection Hole (¯26×2)
Refrigerant Liquid Piping Connection Hole (¯47)

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.

NoteThe drain connector is installed for discharging condensation water
Convex Drain Connector
Washer

Base Drain Hole

Drain Connector
Drain Pipe (Field Supplied)

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.

Piping between Outdoor Unit and First Multi-kit

Gas/Liquid Pipe Size (mm)

HP

Equivalent Length100m

Equivalent Length100m

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

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

When installing pipe through the wall, secure a cap at the end of the pipe.

Do not pClOacReREthgCerTopuinpde.directly on the CORRECT

INCORRECT

CORRECT

INCORRECT

CORRECT

INCORRECT

Rain water can enter

Hole

Hole

Attach a cap or vinyl tape

Attach a cap or vinyl tape

Attach a cap or vinyl bag with rubber band.

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 use9.53 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.

9

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.

First Multi-Kit

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

PCiopninngection1Kit 1

Piping 2 Connection Kit 2

Indoor

Indoor

Indoor

Indoor

Indoor

Indoor

Item

Allowable length

The number of indoor unit is The number of indoor unit

less than the recommended exceeds the recommended

maximum combined number maximum combined number

of units.

of units.

Maximum Piping Length

Actual length Equivalent length
Total length

Maximum Piping Length

Length between First Multi-kit and the furthest indoor unit
Length between each Multi-kit and Each indoor unit
Length between Piping Connection Kit 1 and the furthest outdoor unit

Maximum Height Difference
between Outdoor and Indoor Unit

If the outdoor unit is higher than indoor unit. If the indoor unit is higher than outdoor unit. Height difference between Each indoor unit Height difference between Each outdoor unit

Multi-kit and Piping

First Multi-kit

L t1000m L 290m

L 1165m L 1190m

L t300m L 240m

L 340m

L 330m

Outdoor Unit (HP)
8 10 12~14 16 18~24 26~34 36~54

L 510m

H 150m

H 140m

H 215m

H 50.1m

Gas/Liquid Piping
Diameter (¯mm)
(L 1 100m)

Gas/Liquid Piping
Diameter (¯mm)
(L 1 100m)

19.05 / 9.53 22.2 / 12.7

22.2 / 9.53 25.4 / 12.7

25.4 / 12.7 28.6 / 15.88

28.6 / 12.7 31.75 / 15.88

28.6 / 15.88 31.75 / 19.05

31.75 / 19.05 34.9 / 22.2

38.1 / 19.05 41.3 / 22.2

Multi-Kit Type
E-NP282S E-NP452S E-NP692S E-NP902S

Indoor Unit Total Capacity (kW)

Gas/Liquid Piping Diameter (¯mm)

Multi-Kit Type

Other Multi-kits

101.0 73.0~100.9 50.0~72.9 45.0~49.9 33.5~44.9 25.0~33.4 16.0~24.9

15.9

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.

38.1 / 19.05 31.75 / 19.05 28.6 / 15.88
28.6 / 12.7 25.4 / 12.7 22.2 / 9.53 19.05 / 9.53
15.88 / 9.53

E-NP902S E-NP692S E-NP452S
E-NP282S

10

Piping diameter restriction between Multi-Kit and indoor units:

Indoor Unit Capacity (kW)

Piping Diameter

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 9.53.

Piping diameter restriction on indoor units:

Outdoor Unit

Model

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

Gas Piping

a100m

Piping

Liquid Piping

Size

Gas Piping

a100m Liquid Piping

22.2

25.4

12.7

19.05

22.2

9.53

RAM-12MQ(D) RAM-14MQ(D) 28.6 15.88 25.4 12.7

RAM-16MQ(D) RAM-18MQ(D) 31.75 19.05 28.6 15.88

Master (A)

Slave (B)

Slave (B)

Master (A)

HP

Combination Model

Master (A) Slave (B)

Piping Connection Kit

a100m

Gas Piping
Liquid Piping

a100m
Piping Size
b

Gas Piping
Liquid Piping
Gas Piping
Liquid Piping

Gas Piping c Liquid Piping

20 10MQ(D) 10MQ(D)
22.2 9.53 22.2

20

22

12MQ(D) 14MQ(D)

8MQ(D) 8MQ(D)

E-NP692S

24 14MQ(D) 10MQ(D)

31.75

19.05

28.6

15.88

25.4

19.05

22.2

9.53

26 14MQ(D) 12MQ(D)
12.7

28

30

14MQ(D) 16MQ(D)

14MQ(D) 14MQ(D)

E-NP902S

32 16MQ(D) 16MQ(D)

34.9

22.2

31.75

19.05

28.6

25.4

28.6

12.7

11

Master (A)

Slave (B)

Slave (C)

Slave (C)

Slave (B)

Master (A)

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

a100m a100m
b

Gas Piping
Liquid Piping
Gas Piping
Liquid Piping
Gas Piping
Liquid Piping

Piping Size
c

Gas Piping
Liquid Piping

Gas Piping d Liquid Piping

34.9 31.75
25.4

28.6 15.88
12.7

25.4 12.7

E-NP902S×2 41.3
22.2 38.1
19.05
28.6

31.75 19.05

15.88 28.5

15.88

Gas

22.2

Piping

25.4

22.2

e

Liquid

9.53

Piping

12.7

9.53

25.4 12.7

28.6 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

12

Liquid Piping

Q’ty
Type
Gas Piping

1 E-NP692S

1 E-NP902S

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.

HPMaster (A) Slave (B) Slave (C)
Piping LengthLA LB LC 10m
Keep the pipes straight at least 0.5m after piping connection kits.

Master (A)

Slave (B)

Slave (C)

PCiopninngection Kit

L

L

L

Mbeatxw.eLeifntODiufftedroeonrce U0n.1itm= 0.1m

Indoor UnitSide

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.

Base
Bottomof Outdoor Unit IndoorUnitSide

Master (A)

Slave (B)

Slave (C)

M3a0x0.m3m00mm M30a0x.m3m00mm

M30a0x.m3m00mm

Indoor Unit Side

OilTrap OilTrap OilTrap M20in0.m2m00mm M20in0.m2m00mm M20in0.m2m00mm

13

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.

IndoorUnitSide

Master (A)

Slave (B)

Slave (C)

IndoorUnitSide

Master
(A) Oil Trap 2M00inm.m200mm

Slave (B)

Oil Trap 2M0i0nm. m200mm

Slave (C)

Less2mthan2m

Les2smthan2m

Les2smthan2m

Les2smthan 2m

2m o2rmmore

2m2mor more

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.

IndoorUnit Side

Master (A)

Slave (B)

Slave (C)

Indoor Unit Side

Master (A)

Slave (B)

Slave (C)

Refrigerantoil accumulates 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.
Master Slave Slave ((A) ) ((B) ) ((C) )
550000mmmm
IndoorUnitSide
6.Place the piping connection kits horizontally (within ±15°).
15Within±15°

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

Front or Rear SOiudtdeooPr11i/p/33ing Connection

Outdoor Unit

Outdoor 1/3 Piping Connection
Kit 1 (Gas)

Gas Piping (Field Supplied)
Gas Line Refrigerant Piping
Connection ()

Piping Connector (L-Shape)

Outdoor 22//33
Piping Connection Kit 2 (Gas)

Liquid Piping ((Field Supplied)

Piping Connector (L-Shape)

Piping Connection Kit 1 (Liquid)

Outdoor 33//33

Liquid Line Refrigerant
PipingConnection

Piping Connector (L-Shape)

Liquid Piping (Field Supplied)
Gas Piping (Field Supplied)
14

Piping Connector (L-Shape)

Piping Connection Kit 2 (Liquid)

Liquid Piping (Field Supplied)

Gas Piping (Field Supplied)

Downward Piping Connection
Outdoor 1/3

Piping Connection Kit 1 (Gas)

Outdoor 2/3

Gas Piping (Field Supplied)
Liquid Piping (Field Supplied)
Piping Connection Kit 1 (Liquid)

Piping Connector (Z-Shape)

Outdoor33//33

Piping Connector (Z-Shape)

Piping Connector (L-Shape)

Piping C2o(nnection) Kit 2 (Gas)

Piping Connector (L-Shape)

PKiitpi2ng(LCiq2ou(nidn)ection)

Gas Piping (Field Supplied)

(3) Pipe Connection Position

Liquid Piping (Field Supplied)

GCoansnLeincteioRnefrigerantPip(ing)

D C 100

D C 100

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

Liquid Line Refrigerant
PipingConnection 145 245

A A B B

Unit:mm

A

B

C

D

Gas Line Refrigerant Liquid Line Refrigerant Gas Line Refrigerant Liquid Line Refrigerant

Piping Connection Piping Connection

Piping Connection

Piping Connection

320

150

155

335 315

170

175

15

(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 BranchOne multi-kit is connected with other multi-kits connected with more than one indoor unit.

Setting ConditionThe 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 :

Best installationsituation

Third3Branch

Outdoor First B1ranch

Second B2ranch Seco2nd Main Branch

FirstMa1inBranch

Allowing installation situation

Outdoor

Second2Branch Third3Branch

First 1Branch

First M1ain Branch

Second Main Branch 2

Third 3Branch

Outdoor First1Branch

Second2 Branch

Incorrect

First Mai1n Branch Secon2dMainBranch

Outdoor

SecondB2ranch ThirdBr3anch Fourt4h Branch

First1Branch

FirstM1ainBranch

Second 2MainBranch Incorrect

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.

Allowing installation situation
Pipe Length 40m~90m
Outdoor

First Main Branch

71Type

71Type

Allowing installation situation

Allowing installation situation

71Type
y
71Type

Indoor Unit Total Capacity 50%

Outdoor
First Branch

71Type 71Type

Indoor Unit Total Capacity 50%

First Main Branch

71Type 140Type

71Type
71Type 140Type
140Type

Indoor Unit Total Capacity 33%
Indoor Unit Total Capacity 67%

Pipe Length 40m~90m Outdoor Second M2ain Branch Third3Branch
First Main Branch

16

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.

Up

Up

Straight Pipe

0.5m Above Up

In the same Horizon Plane
Down

Down

2.Vertical

Upward BranchKeep the outdoor unit pipes straight at least 0.5m after piping connection kits.

Downward BranchKeep the outdoor unit pipes straight at least 0.5m after piping connection kits.

Up

Up

Straight Pipe 0.50m.5Ambove

Down

Upward Branch
Straight Pipe 00.5.5mmAbove

Down

Downward Branch

TiltAngle W15ithin 15°

15
Tilt Angle (A Direction)

(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.)

(Fixation[Methods Ex]ample) Outdoor Unit

Piping Fixation Interval

Pipe Size 22.2 25.4

Max. Interval 1.0m

1.5m

Indoor Unit

(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.

Right Piping (Rig(ht Side) )

Front Piping (F(rontSide))

Left Piping ((LeftSide))

Base

Bottom Piping (Bo(ttomSide))

Rear Piping (R(earSide))

Gas Stop Valve Set

Discard

Original Washer

Closed Flange

Bolt 2 Piece Spring Washer 2 Piece Flat Washer 2 Piece
Attached Washer
Flange Combination
Flat Washer 2 Piece Spring Washer 2 Piece Flare Nut

17

(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.
2. 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

Piping Size (mm) ¯6.35(1/4″)

Tightening Torque 20Nm

Do not apply the double spanner work here. (Refrigerant leakage will occur)

¯9.53(3/8″)

40Nm

¯12.7(1/2″)

60Nm

¯15.88(5/8″) ¯19.05(3/4″)

80Nm 100Nm

Double spanner work Stop valve tightening work

Flange With Bolt

53~75 Nm

(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.

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.

3. Vacuum drying determination example

Vacuum Degree Vacuum Degree Vacuum Degree

Outside air temperature 23°C
After the vacuum pump stop, the vacuum degree rebound phenomenon Vacuum pump stop

Outside air temperature 20°C

System without moisture

System with moisture

System with

System with

moisture, outside air

moisture, outside air

(

temperature 20°C

temperature 10°C

Vacuum Time (min) Figure1Vacuum Time and Vacuum Degree

Vacuum Time (min)

The system without moisture is not affected by outside air temperature.

Vacuum Time (min)

Figure2 Vacuum time and degree with moisture in system

Figure3Outside air temperature vacuum time and degree

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.

18

(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.

1. Calculation of Additional Refrigerant W (kg)

No. Refrigerant

1

W1

Content

Additional Amount of Refrigerant for Liquid Pipe W1(kg)

Pipe Size

Pipe Length (m)

The Amount of Refrigerant Per Meter

22.2

m

x0.39=

19.05 15.88

m

x0.28=

m

x0.19=

12.7

m

x0.12=

9.53

m

x0.06=

6.35

m

x0.03=

Total Amount of Additional Refrigerant for Liquid Pipe

Additional Amount of Refrigerant W1(kg)

Additional Refrigerant (kg) kg

Additional 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.

2

W2

kg

The Total Number of 8HP, 10HP Indoor Unit

Additional Amount of Refrigerant W2(kg)

x1.0kg/unit =

Calculation of Indoor Unit Connection Capacity Ratio

(Indoor Unit Total Capacity / Outdoor Unit Capacity)

3

W3

Condition Connection Capacity Ratio 100%

Additional Amount of Refrigerant W3(kg) 0.0kg

kg

Connection Capacity Ratio 100 ~ 115%

0.5kg

Connection Capacity Ratio 116 ~ 130%

1.0kg

4

W

Additional Amount of Refrigerant W(kg)(W1W2W3)

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 W0
W Wo = 100 kg
Note: W0 : Factory refrigerant charging weight.

Additional Refrigerant: W

kg

System Refrigerant:

kg

Additional Refrigerant Date:

/

/