Toshiba HFC R407C Installation Instructions

1402241301R01

Modular Multi System

Outdoor

Installation Instructions

Air Conditioner – Multi Split Type System

Instructions d’Installation Extérieure

Climatiseur – Système de Type Multi Split

Außengerät

Installationsanleitung

Klimaanlage – Geteilte Multi-Bauweise

Exterior

Instrucciones de Instalación

Aire acondicionado – Sistema de Tipo Multi Split

Istruzioni per l’installazione dell’unità esterna

Condizionatore d’aria – Tipo Multi Split

Buiten

Installatievoorschriften

Airconditioning – Multi-delig Type Systeem

HFCR407C

GB

F

D

E

I

NL

Contents

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Trial Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48

Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64

GB

Passer à la page 65 pour lire le manuel d’installation en

F français.

D Die deutsche Montageanleitung finden Sie auf Seite 127.

EPor favor, vaya a la página 189 para seguir las instrucciones del manual de instalacíon en lengua española.

I Il manuale d’installazione italiano è a pagina 251.

NL Zie bladzijde 313 voor de Nederlandse Installatichandleiding.

3

	Introduction
	Contents
	Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	.5
	Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	.6
	Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	7
GB	Metric/Imperial pipe conversion . . . . . . . . . . . . . . . . . . . . .	7

4

Introduction

Precautions

Please read these instructions carefully before starting the installation.

This equipment should only be installed by suitably trained operatives.

In all cases ensure safe working practice: Observe precautions for persons in the vicinity of the works.

Ensure that all local, national and international regulations are satisfied.

Check that the electrical specifications of the unit meet the requirements of the site.

Carefully unpack the equipment, check for damage or shortages. Please report any damage immediately.

These units comply with EC Directive:

73/23/EEC (Low Voltage Directive) and 89/336/EEC (Electro Magnetic Compatibility).

Accordingly, they are designated for use in commercial and industrial environments.

Avoid installation in the following locations:

Where the water drainage may cause a nuisance or a hazard when frozen.

Where there is a danger of flammable gas leakage.

Where there are high concentrations of oil.

Where the atmosphere contains an excess of salt (as in coastal areas). Special maintenance is required to maintain product design life.

Where the airflow from the outdoor unit may cause annoyance.

Where the operating noise of the outdoor unit may cause annoyance.

Where the foundation is not strong enough to fully withstand the weight of the outdoor unit.

Where strong winds may blow against the air inlet of the outdoor unit.

Precautions for R407C Systems

R407C outdoor units use synthetic oils which are extremely hygroscopic. Therefore ensure that the refrigerant system is NEVER exposed to air or any form of moisture.

Mineral oils are unsuitable for use in these units and may lead to premature system failure.

Use only equipment which is suitable for use with R407C. Never use equipment which has been used with R22.

R407C should only be charged from the service cylinder in the liquid phase. It is advisable to use a gauge manifold set equipped with a liquid sight glass fitted in the centre (entry) port.

GB

5

Introduction

Operating Conditions

	Outdoor Temperature	–5 ~ 43°C	Cooling
		–15 ~ 21°C	Heating
	Room Temperature	18 ~ 32°C	Cooling
		15 ~ 29°C	Heating
	Room Humidity	<80%	Cooling

GB

1. Allocation standard of Model name

OUTDOOR

MM–A0280HT

Modular Multi

INDOOR

A – Outdoor

0280

– 28.0kW (10HP)

C – Cooling

T – Inverter

0224

– 22.4kW (8HP)

H – Heating

X – Fixed Speed

0160

– 16.0kW (6HP)

MM–TU056

Modular Multi

	B	– Built-In Duct Type
					028 – 2.8kW (1HP)
	C (CR) – Ceiling Type (IR Remote)
					042 – 4.2kW (1.5HP)
	K (KR) – High Wall Type (IR Remote)
					056 – 5.6kW (2HP)
	N	– Carcase Type
					080 – 8.0kW (3HP)
	S (SR)	– Low Wall Type (IR Remote)
					112 – 11.2kW (4HP)
	SB	– Built-In Slim Duct Type
					140 – 14.0kW (5HP)
	TU	– 2 Way Cassette Type
	U	– 4 Way Cassette Type

2. Range of combined units

No. of combined units	: 1 to 5 units
Capacity range	: Equivalent to 14HP (0384kW type) to 46HP (1288kW)

3.Restriction for combination units

(1)The Inverter Unit should have the maximum capacity among all units in that combination.

(2)The 6HP fixed-speed unit is available only with the combination of 14HP and 22HP. (It cannot be used for any other combination.)

4.Rated conditions

Cooling	: Indoor air temperature 27°C DB/19°C WB
	Outdoor air temperature 35°C DB/25°C WB
Heating	: Indoor air temperature 21°C DB/15.5°C WB
	Outdoor air temperature 7°C DB/6° C WB

5. Mode Priority

This Outdoor Unit is set to operate with the Heating mode taking precidence. This precidence can be switched between Heat and Cool mode using the DIP switch 07 on the Outdoor Unit Interface PCB (MCC-1343-01) as follows:

ON OFF

Heat Priority (factory set)

ON OFF

Cool Priority

6

Introduction

Components

1. Outdoor Unit

	Inverter unit			Fixed-speed unit				Appearance
Corresponding HP
	8HP	10HP	6HP		8HP		10HP
Model name	MM-A0224HT	MM-A0280HT	MM-A0160HX		MM-A0224HX	MM-A0280HX
Cooling capacity (kW)	22.4	28.0	16.0		22.4		28.0
Heating capacity (kW)	25.0	31.5	18.0		25.0		31.5

GB

2. Outdoor Units (Combination of Outdoor Units)

	Corresponding HP		8HP	10HP	14HP	16HP	18HP	20HP	22HP	24HP	26HP	28HP	30HP	32HP	34HP	36HP	38HP	40HP	42HP	44HP	46HP
	Combined Model MM-A~HT		0224	0280	0384	0440	0504	0560	0608	0672	0728	0784	0840	0896	0952	1008	1064	1120	1176	1232	1288
	Cooling capacity (kW)		22.4	28.0	38.4	44.8	50.4	56.0	60.8	67.2	72.8	78.4	84.0	89.6	95.2	100.8	106.4	112.0	117.6	123.2	128.8
		Inverter unit	8HP	10HP	8HP	8HP	10HP	10HP	8HP	8HP	10HP	10HP	10HP	8HP	10HP	10HP	10HP	10HP	10HP	10HP	10HP
	Combined		—	—	6HP	8HP	8HP	10HP	8HP	8HP	8HP	10HP	10HP	8HP	8HP	10HP	10HP	10HP	8HP	10HP	10HP
			—	—	—	—	—	—	6HP	8HP	8HP	8HP	10HP	8HP	8HP	8HP	10HP	10HP	8HP	8HP	10HP
	outdoor	Fixed-
	units
		speed unit	—	—	—	—	—	—	—	—	—	—	—	8HP	8HP	8HP	8HP	10HP	8HP	8HP	8HP
			—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	8HP	8HP	8HP
	No. of connectable		13	16	16	18	18	20	22	24	26	28	30	32	34	36	38	40	40	40	40
	indoor units
	Min. HP Connection		4	5	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23
	Max. HP Connection		10.8	13.5	18.9	21.6	24.3	27	29.7	32.4	35.1	37.8	40.5	43.2	45.9	48.6	51.3	54	56.7	59.4	62.1

Metric/Imperial pipe conversion

Diameter (mm)	6.4	9.5	12.7	15.9	19.0	22.0	28.6	34.9	41.3	54.1
Nominal Diameter (inch)	1/4	3/8	1/2	5/8	3/4	7/8	1 1/8	1 3/8	1 5/8	2 1/8

Note: 1.0MPaG = 10.2kgf/cm2G

7

Introduction

Components

3. Indoor Unit

GB

Type	Appearance	Model name	Capacity code/	Cooling Capacity	Heating Capacity
			HP	(kW)	(kW)
4 Way Cassette		MM-U056	2	5.6	6.4
		MM-U080	3	8.0	9.6
Type ‘U’
		MM-U112	4	11.2	12.8
		MM-U140	5	14.0	15.8
2 Way Cassette		MM-TU028	1	2.8	3.2
Type ‘TU’		MM-TU042	1.5	4.2	4.8
		MM-TU056	2	5.6	6.4
Built-In Slim
Duct Type ‘SB’		MM-SB028	1	2.8	3.2
Built-In Duct,		MM-B056	2	5.6	6.4
		MM-B080	3	8.0	9.6
Type ‘B’
		MM-B112	4	11.2	12.8
		MM-B140	5	14.0	15.8
		MM-C/CR042	1.5	4.2	4.8
Ceiling		MM-C/CR056	2	5.6	6.4
Type ‘C’		MM-C/CR080	3	8.0	9.6
		MM-C/CR112	4	11.2	12.8
		MM-C/CR140	5	14.0	15.8
High Wall		MM-K/KR042	1.5	4.2	4.8
		MM-K/KR056	2	5.6	6.4
Type ‘K’
		MM-K/KR080	3	8.0	9.6
Carcase		MM-N028	1	2.8	3.2
		MM-N042	1.5	4.2	4.8
Type ‘N’
		MM-N056	2	5.6	6.4
		MM-N080	3	8.0	9.6
Low Wall		MM-S/SR056	2	5.6	6.4
Type ‘S’
		MM-S/SR080	3	8.0	9.6

8

Installation

Contents

Outdoor Unit

	Transportation of the Outdoor Unit . . . . . . . . . . . . . . . . . . . . . . . . . .	.10
	Installation of Outdoor Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	11
	Dimensional Drawings Outdoor Unit	12
	Dimensional Drawings Two Units Connected	13
			GB
	Dimensional Drawings Three Units Connected	14
	Dimensional Drawings Four Units Connected . . . . . . . . . . . . . . . . . . . .	15
	Dimensional Drawings Five Units Connected . . . . . . . . . . . . . . . . . . . .	16
	Multiple Installation on the Rooftop . . . . . . . . . . . . . . . . . . . . . . . . . . .	17

Piping

Free Branching System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 Connecting Refrigerant Pipes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 Permissible Length/Height Separation of Refrigerant Piping . . . . . . . .21 Selection of Refrigerant Piping and Charge Requirement . . . . . . . . . .22 Branch Headers/Branch Joints (Accessories) . . . . . . . . . . . . . . . . . . . . .24 Branch Header/T-shape Branch Joint . . . . . . . . . . . . . . . . . . . . . . . . . .25 Connecting the Branching Kit/Y-shape Branching Joint . . . . . . . . . . . .26 Heat Insulating the Branching Pipes/Branching Header . . . . . . . . . . .27 T-shape Branching Joint – to Connect Outdoor Units . . . . . . . . . . . . . .29 Installation of Gas/Liquid Branching Pipes . . . . . . . . . . . . . . . . . . . . . .30 Airtight Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31 Leak Position Check/Air Purge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32 Calculating the Additional Refrigerant Required . . . . . . . . . . . . . . . . .33 Additional Charge Amounts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

Wiring

General/Wiring System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

Connecting Power Source Cable/Control Cable . . . . . . . . . . . . . . . . . .36

Control Wiring Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

9

Installation

Outdoor Unit

Transportation of the Outdoor Unit

Fork Lift

•Front Access – insert the forks into the slots on the fixing legs.

•Side Access – see diagram.

GB

Front Access

Side Access

Fork lift

Fixing Leg

Crane

•Check the suitability of the lifting rope (see table).

•Secure lifting rope through transportation slot.

•Protect the unit where rope contact could scratch or deform it.

Fork lift/ Hand Truck

Model Weight

MM-A0280HT 284.0kg

MM-A0224HT 282.0kg

MM-A0280HX 280.0kg

MM-A0224HX 278.0kg

MM-A0160HX 204.0kg

Protection

Rope

Protection

Transportation Slots

10

Installation

Outdoor Unit

Installation of Outdoor Unit

1.Align the outdoor units at intervals of 20mm or more.

Fix the outdoor units with M12 anchor bolts. (4 positions per unit.)

Anchor bolt with 20mm length is suitable.

20mm

≥ 20mm

≥ 20mm

GB

M12 anchor bolt,

4 positions per unit

• Anchor bolt pitch is as shown in the following figure.

700mm ≥ 310mm 700mm ≥ 310mm 700mm

755mm

15 x 20mm slot

•However, the equivalent pipe length between the nearest outdoor unit and farthest outdoor unit of the refrigerating cycle system should not exceed 20m.

2.When routing the refrigerant piping through the base, the fixing height of the base (two-divided foundations) must be 500m or more.

≥ 500mm

Refrigerant Piping

3. Correct foundation mounts for supporting the Outdoor unit:

Note: The leading outdoor unit to be connected to the main refrigerant piping for the indoor units must be an inverter unit.

11

Installation

Outdoor Unit

Dimensional Drawings

Outdoor Unit

GB

Model Name:

MM-A0280HT, MM-A0224HT, MM-A0280HX, MM-A0224HX, MM-A0160HX

				Grounding part
4-15 x 20 (Slot)				of bottom plate			Base
					80
				100 610 100
Fixing bolt pitch	755	790	(including fixed leg)		630		755	Fixing bolt pitch
Fixing bolt pitch					80
700							Base
990						700

Fixing bolt pitch

Base bolt position

750

90

1700

1560

700		Refrigerant pipe connecting port
		(Gas side) braze connection (ØA)
88	245	190	235

2-60 x 150 Slot		Refrigerant pipe connecting port
	500	(Liquid side) flare connection (ØB)
(for transport)	(Slot pitch)	Balance pipe connecting							Refrigerant pipe
		port flare connection (ØC)			Refrigerant pipe		(knock out)
									connecting port
Note: All dimensions in (mm)					connecting port		173		(Gas side)
					(Liquid side)
							60	115			(knock out)
					Balance pipe
					connecting port					64 125
Model		ØA	ØB	ØC	145	130			140		170
		mm	mm	mm
MM-A0280HT, MM-A0280HX		28.6	12.7	9.52				20
							65 35

MM-A0224HT, MM-A0224HX 22.2 12.7 9.52

	MM-A0160HX	22.2 9.52 9.52	Details of piping
			connections

12

Installation

Outdoor Unit

Dimensional Drawings

Two Units Connected

Model Name:

MM-A0384HT, MM-A0440HT, MM-A0504HT, MM-A0560HT

	≥ 20
	8-15 x 20 (Slot)
	750	755 Fixing bolt pitch	790	(including fixed leg)
700	700
Fixing bolt pitch	Fixing bolt pitch
990	990
1	2

GB

90

1700

1560

88 700

		2000
300	(Rear side)
≥			1550≥
≥	10
≥ 500		≥ 10
		≥ 20
	side)	≥ 2020
	(Front
		No.	Name

1	Outdoor Unit (Inverter type)
2	Outdoor Unit (Fixed-speed type)

Note: All dimensions in (mm)

13

Installation

Outdoor Unit

Dimensional Drawings

Three Units Connected

GB

Model Name:

MM-A0608HT, MM-A0672HT, MM-A0728HT, MM-A0784HT, MM-A0840HT

	≥ 20		≥ 20	12-15 x 20 (Slot)
				750	755 Fixing bolt pitch	790	(including fixed leg)
700	310	700	310	700
Fixing bolt pitch		Fixing bolt pitch		Fixing bolt pitch
990		990		990
1		2		3

90

1700	1560
	700
	88

300	(Rear side)
≥		1550≥
≥ 10
≥ 500		≥ 10
	≥ 20	≥ 20

side)	≥ 3030
(Front
			No.			Name
Note: All dimensions in (mm)				1		Outdoor Unit (Inverter type)
				2		Outdoor Unit (Fixed-speed type 1)
				3		Outdoor Unit (Fixed-speed type 2)

14

Installation

Outdoor Unit

Dimensional Drawings

Four Units Connected

Model Name:

MM-A0896HT, MM-A0952HT, MM-A1008HT, MM-A1064HT, MM-A1120HT

			≥ 20		≥ 20		≥ 20	16 - 15 x 20 (Slot)
								750	755 Fixing bolt pitch	790	(including fixed leg)
		700	310	700	310	700	310	700
		Fixing bolt pitch		Fixing bolt pitch		Fixing bolt pitch		Fixing bolt pitch
		990		990		990		990
	1		2		3		4
	90
1700	1560
	700
	88
					4020
			300	(Rear side)
			≥

≥ 10			1550≥
≥ 500			≥ 10
	≥ 20	≥ 20	≥ 20
side)
(Front		≥ 4040

	No.			Name
		1		Outdoor Unit (Inverter type)
Note: All dimensions in (mm)		2		Outdoor Unit (Fixed-speed type 1)
				Outdoor Unit (Fixed-speed type 2)
		3
		4		Outdoor Unit (Fixed-speed type 3)

GB

15

Installation

Outdoor Unit

Dimensional Drawings

Five Units Connected

	Model Name:
GB	MM-A1176HT, MM-A1232HT, MM-A1288HT
		≥ 20		≥ 20		≥ 20		≥ 20	20 - 15 x 20 (Slot)
									700	755 Fixing bolt pitch	790	(including fixed leg)
	700	310	700	310	700	310	700	310	700
	Fixing bolt pitch		Fixing bolt pitch		Fixing bolt pitch		Fixing bolt pitch		Fixing bolt pitch
	990		990		990		990		990
	1		2		3		4		5
	90
1700	1560
	700
	88

	5030
300	(Rear side)
≥
≥ 10				1550
500				≥ 10
				≥
≥	≥ 20	≥ 20	≥ 20	≥ 20

side)
(Front	≥ 5050

					No.			Name
						1		Outdoor Unit (Inverter type)
						2		Outdoor Unit (Fixed-speed type 1)
Note: All dimensions in (mm)						3		Outdoor Unit (Fixed-speed type 2)
						4		Outdoor Unit (Fixed-speed type 3)
						5		Outdoor Unit (Fixed-speed type 4)

16

Installation

Outdoor Unit

Multiple Installation on the Rooftop

When the Outer Wall is Higher than the Outdoor Unit

If a hole can be made in the wall:

≥ 300
≥ 600		(Front side)
≥ 10	≥ 20	≥ 20	≥ 20	≥ 20
					HD
1. Set an aperture ratio so that suction air volume
Vs from the hole becomes 1.5m/s or less.					H
2. Height of discharge duct: HD = H - h.					h

If a hole cannot be made:

≥ 300
≥ 600		(Front side)
≥ 10	≥ 20	≥ 20	≥ 20	≥ 20

GB

Discharge duct

Vs

1000 ≥

Hole in wall

1.Set a base with 500 to 1,000mm height.

2.Height of discharge duct: HD = H - h.

Note: All dimensions in (mm)

Discharge duct

H

h

Base

500 – 1000

17

GB

Installation

Outdoor Unit

When the Outer Wall is Lower than the Outdoor Unit

1-line installation
≥ 300
≥ 500		(Front side)
≥ 10	≥ 20	≥ 20	≥ 20	≥ 20	≤ 800

2-parallel lines installation

		≥ 300
	600	1000)	(Front side)
	≥	≥
		*(

	≥ 300
	≥ 10	≥ 20	≥ 20	≥ 20	≥ 20	≤ 800
3-parallel lines installation
	≥ 300
≥ 600	≥ 1000)		(Front side)
	*(
	≥ 600
	500≥		(Front side)
	≥ 10	≥ 20	≥ 20	≥ 20	≥ 20	≤ 800

*When refrigerant piping is routed from the front
of the unit, distance between Outdoor Unit and
Connecting piping must be 500mm or more.	≥ 500	≥ 500
Note: All dimensions in (mm)	Connecting Piping	Piping

18

Installation

Piping

Free Branching System

The following five branching systems are available to increase the flexibility of refrigerant piping design.

1

system

2Header branching system

3Header branching system after line branching

4Line branching system after header branching

5Header branching system after header branching

GB

Outdoor units

Indoor

units

Remote controller

Outdoor units

Branching header

Indoor

units

Remote controller

Outdoor units

Branching joint

Branching header

Indoor

units

Remote controller

Outdoor units

Branching header

Branching joint

Indoor units

Remote controller

19

Installation

Piping

WARNING!

During installation – if the refrigerant gas leaks, ventilate the room. After installation – check for gas leakages.

If refrigerant gas comes into contact with fire – noxious gas may result!

GB

Connecting Refrigerant Pipes

1.To access the refrigerant piping connections and electrical wiring terminals, remove the 7xM5 securing bolts in the front panel. To remove the panel, lift it up and away from its hanging tabs – See diagram.

2.The refrigerant pipes can be routed forwards, downwards or sideways.

3.If the pipes are routed forwards, make sure they exit through the Piping/Wiring Panel – (remove knock out section) and allow at least 500mm between the Outdoor Unit and the main pipe connecting it to the Indoor Unit. This is for servicing access. (Replacing the compressor, for example, requires a space of at least 500mm.)

4.If the pipes are routed downwards, remove the knockout section in the baseplate of the Outdoor Unit. This will enable access. They can then be connected to the left or right, or the rear side. (Leading pipe of the balancing should be within 4m.)

Notes:

1.When brazing, use nitrogen. This prevents internal oxidisation of the pipes.

2.Always use clean new pipe, and ensure it is not contaminated by water or dust.

3.Always use a double spanner on the flare nut – and tighten to the specified torque: (see table).

Note: All dimensions in (mm)

Tab

Front panel

Piping/Wiring Panel

≥	500	4m
Pipes routed		Within
forward
		Pipes routed downwards

Valve at balance side (oil)

Valve at liquid side

Valve at gas side

Connecting pipe	Tightening	Re-tightening
outer dia. (mm)	torque (Nm)	torque (Nm)
Ø6.4	11.8 (1.2kgf m)	13.7	(1.4kgf m)
Ø9.5	24.5 (2.5kgf m)	29.4	(3.0kgf m)
Ø12.7	49.0 (5.0kgf m)	53.9	(5.5kgf m)
Ø15.9	78.4 (8.0kgf m)	98.0 (10.0kgf m)
Ø19.0	98.0 (10.0kgf m)	117.7	(12.0kgf m)

20

Installation

Piping

Permissible Length/Height Separation of Refrigerant Piping

Fixed-speed

Unit n

<Ex. 1>

<Ex. 2>

(d)

Fixed-

Fixed-

Fixed-

Fixed-

Fixed-

Fixed-

Inverter

Inverter

Inverter

speed

speed

speed

speed

speed

speed

Height

Unit

Unit 1

Unit 2

Connecting

Unit

Unit 1

Unit 2

Unit

Unit

1

Unit

2

difference

Outdoor

between

Unit

piping of

Outdoor

Outdoor

(a)

(b)

(c)

Unit

Units

T-shape branching

La

Lb

Lc

Ld

H3≤ 4m

LA

LB

joint

Main connecting piping between Outdoor Units

Valve for

Valve for

Length corresponded to farthest piping

additional Units

additional Units

Main

between Outdoor Units LO≤ 20m

Note: In <Ex.2>, a large amount of refrigerant and oil may

piping

return to the Inverter Unit. Therefore, set the

T-shape joint so that oil does not enter directly.

L1	Branching piping	L2	Branching header
1st branching	Connecting piping of Indoor Unit			L7
section	a		b	c	d	e
Height	L3		Indoor Unit
	Length corresponded to farthest piping L≤ 125m
difference						Height difference
between	Length corresponded to farthest piping after 1st branching L≤ 50m					between Indoor
Outdoor						Units
Units	L4		L5	L6		H2≤ 30m
H1≤ 50m
	f	g		h	i	j
	Y-joint
				Indoor Unit

GB

System Restrictions
Notes: Combination of Outdoor Units: Inverter Unit +
				Max. No. of combined outdoor units				5 units
	Fixed-speed Unit (0 to 4 units).
				Max. capacity of combined outdoor units				128.8kW/46HP
	Combination of Fixed-speed Units without
				Max. No. of connected indoor units				40 units
	Inverter Unit is not permissible.
				Max. capacity of combined			H2≤ 15	135%
	The Inverter Unit is the master Outdoor Unit
				indoor units			H2>15	105%
	and is directly connected to the indoor
	distribution pipe.
	Install the Outdoor Units in order of capacity.
	(Inverter Unit≥	Fixed-speed Unit 1> Fixed-speed Unit 2>Fixed-speed Unit n).
			Allowable value			Piping section
	Total extension of pipe (Liquid pipe, real length)		250m		LA + LB + La + Lb + Lc + Ld + L1 + L2 + L3 + L4+
					L5 + L6 + L7 + a + b + c + d + e + f + g + h + i + j
	Farthest piping length L (*)	Real length	100m		LA + LB + Ld + L1 + L3 + L4 + L5 + L6 + j
Piping		Equivalent length	125m
length	Equivalent length of farthest piping from 1st branching Li (*)		50m			L3 + L4 + L5 + L6 + j
	Equivalent length of farthest piping between outdoor units LO (*)		20m		LA + LB + Ld, LA + Lb, LA + LB + Lc
	Max. equivalent length of outdoor unit connecting piping		10m			Ld, La, Lb, Lc
	Height between indoor	Upper outdoor unit	50m			——
Height	and outdoor units H1	Lower outdoor unit	30m			——
difference	Height between indoor units H2		30m			——
	Height between outdoor units H3		4m			——

*(d) is Outdoor Unit farthest from branching and (j) is Indoor Unit farthest from 1st branching.

21

Installation

Piping

Selection of Refrigerant Piping and Charge Requirement

GB

Branching piping

6 Header Branching Pipe

FixedFixedFixed-
speed	speed	speed	Inverter	Indoor Unit connecting pipe
Unit n	Unit 2	Unit 1	Unit

					Outdoor Unit			4			5	5
					2	Balance pipe
1	Outdoor	1	1	1	6	T-shape branching joint			6	Y-shape branching
							Main piping					4
	Unit					3				joint	4
	connecting		2	2
	piping
			Main connecting								5	5
							1st branching		Indoor Unit
			piping between
									connecting
			Outdoor Units				section
									piping

4

5

5

5

Indoor Unit

4

5

5

5

Indoor Unit

1

kW	HP	Model name	Gas side	Liquid side
16.0	6	MM-A0160HX	Ø22.2	Ø9.5
22.4	8	MM-A0224HT, MM-A0224HX	Ø22.2	Ø12.7
28.0	10	MM-A0280HT, MM-A0280HX	Ø28.6	Ø12.7

2 Connecting Pipe Size Between Outdoor Units

Total capacity code of outdoor	Gas side	Liquid side	Balance pipe
units
Below 16	Ø28.6	Ø15.9	Ø9.5
16 to Below 20	Ø34.9	Ø15.9	Ø9.5
20 to Below 26	Ø41.3	Ø19.0	Ø9.5
26 to Below 32	Ø41.3	Ø22.2	Ø9.5
32 or more	Ø54.1	Ø22.2	Ø9.5

3 Size of Main Pipe

Total capacity code of all outdoor units	Gas side	Liquid side
Below 10	Ø22.2	Ø12.7
10 to Below 14	Ø28.6	Ø12.7
14 to Below 20	Ø34.9	Ø15.9
20 to Below 26	Ø41.3	Ø19.0
26 to Below 32	Ø41.3	Ø22.2
32 or more	Ø54.1	Ø22.2

4 Size Between Branching Sections

Total capacity code of indoor units		Gas side	Liquid side
downstream (*1)
Below 4.0		Ø15.9	Ø9.5
4.0 to Below	6.4	Ø19.0	Ø9.5
6.4 to Below 13.2		Ø22.2	Ø12.7
13.2 to Below	19.2	Ø34.9	Ø15.9
19.2 to Below	25.2	Ø41.3	Ø19.0
25.2 to Below	31.2	Ø41.3	Ø19.0
31.2 or more		Ø54.1	Ø22.2

Note: All dimensions in (mm)

22

Installation

Piping

5

Unit	Gas side (*4)	Liquid side
028 type to 056 type	Ø12.7	Ø 6.4
080 type	Ø15.9	Ø 9.5
112 type to 140 type	Ø19.0	Ø 9.5

i.e. MM-SB028 = Gas Ø12.7, Liquid Ø6.4

6 Branching joints/headers

		Model name		Usage				Appearance
		RBM-Y018	Indoor unit capacity code (*1): Total below 6.4
Y-shape		RBM-Y037	Indoor unit capacity code (*1): Total 6.4 or more and below 13.2				(*2)
branching joint		RBM-Y071	Indoor unit capacity code (*1): Total 13.2 or more and below 25.2				(*2)
		RBM-Y129	Indoor unit capacity code (*1): Total 25.2 or more				(*2)
4-branching header (*3)		RBM-H4037	Indoor unit capacity code (*1): Total below 13.2				Max. 4
		RBM-H4071	Indoor unit capacity code (*1): Total 13.2 or more and below 25.2				branches
8-branching header (*3)		RBM-H8037	Indoor unit capacity code (*1): Total below 13.2				Max. 8
		RBM-H8071	Indoor unit capacity code (*1): Total 13.2 or more and below 25.2				branches
			1 set of 3 types of T-shape joint pipes as described below:
			The required quantity is arranged and they are combined at the site.
T-shape branching joint
				Connecting pipe	Corresponding dia. (mm)		Qty
(For connection of		RBM-T129
				Balancing pipe	Ø9.52		1
outdoor unit)
				Piping at liquid side	Ø12.7 to Ø22.2		1
				Piping at gas side	Ø22.2 to Ø54.1		1

GB

7 Additional Refrigerant Amount

Liquid pipe size	Additional refrigerant amount for liquid pipe 1m (kg)
Ø6.4	0.030
Ø9.5	0.065
Ø12.7	0.115
Ø15.9	0.190
Ø19.0	0.290
Ø22.2	0.420

(*1) Code is determined according to the capacity code of the Indoor Units connected. For details, refer to the Introduction section in this manual.

(*2) If the total capacity code value of Indoor Units exceeds that of Outdoor Units, apply the capacity code of Outdoor Units.

(*3) When using a branch header, Indoor Units with a maximum of 6.0 capacity code in total can be connected to each branch.

(*4) If the length of the gas pipe exceeds 30m from the 1st branching to an Indoor Unit, increase the Gas pipe section by 1 size, i.e. MM-U140 = Gas Ø22.2, Liquid Ø9.5.

Note: All dimensions in (mm)

23

Installation

Piping

Branch Headers/Branch Joints (Accessories)

GB

Y-shape Branch Joint

	RBM-Y018
[Gas side]
	528
	Ø15.9
	Ø19.0
Ø15.9		Ø19.0
Ø19.0		Ø15.9
Ø22.2	Heat insulator
Ø15.9		Ø12.7
		Ø9.5
Ø12.7
Ø9.5		Ø6.4
		80
	Heat insulator	Ø6.4
	Ø12.7	Ø9.5
	420

[Liquid side]

Ø12.7

Ø9.5

100

Ø9.5

Ø12.7

RBM-Y037

[Gas side]

571

	Ø22.2	Ø19.0
		Ø15.9
	Ø28.6
Ø22.2		44	120
Ø28.6
Ø31.8
Heat insulator		Ø9.5
	Ø22.2	Ø12.7
		Ø15.9
	Ø19.0
Ø15.9	Ø12.7
Ø12.7	Ø9.5
Ø9.5	Ø6.4
	80
Heat insulator	Ø6.4
Ø12.7	Ø9.5
420

[Liquid side]

RBM-Y071

RBM-Y129

[Gas side]

638

444

		Ø41.3
		A	122.5
Ø34.9
Ø41.3
	Heat insulator		Ø12.7
	Ø34.9		Ø15.9
		Ø22.2	Ø19.0
	423	Ø15.9
	Ø19.0
Ø19.0		Ø12.7
Ø15.9		Ø9.5
		85
	Heat insulator	Ø6.4
		Ø9.5
	Ø15.9	Ø12.7

[Gas side]

		160	126	253.5
	Ø41.3		Ø54.1	Ø54.1 (outer dia.)
	Ø54.1	Ø54.1	212	Ø41.3	Ø34.9	Ø22.2
				Ø41.3		Ø34.9
		(outer dia.)
					(outer dia.)
		Ø54.1
			Ø41.3	160		237
			Ø41.3 (outer dia.)	Ø41.3	Ø22.2
				Ø34.9	Ø19.0
		Ø22.2	Ø22.2		Ø19.0	Ø15.9
						Ø12.7
	Ø19.0		523		Ø15.9
					Ø12.7
					85
		Heat insulator			Ø6.4
			518		Ø9.5
			Ø19.0	Ø15.9	Ø12.7

[Liquid side]

Ø34.9 Ø22.2

Ø19.0

194

[Liquid side]

Note:

This additional connecting pipe is used if the gas pipe size is Ø41.3 or less. When brazing, the minimum insertion margin is 15mm.

Note: All dimensions in (mm)

24

Installation

Piping

Branch Header

Note: Pipe dia. shown indicates dia. of pipe to be connected.

		RBM-H4037								RBM-H8037
[Gas side]						[Gas side]
		515								795
	Ø9.5	80	80	80			Ø9.5	80	80	80	80	80	80	80
	Ø12.7						Ø12.7
	Ø15.9				204		Ø15.9
	Ø19.0						Ø19.0
Ø15.9						Ø19.0
Ø19.0
						Ø2.22
Ø22.2		Heat insulator
Ø28.6						Ø28.6				Heat insulator
		522								842
		Heat insulator			75					Heat insulator
Ø9.5					109	Ø9.5
Ø12.7						Ø12.7
Ø15.9	Ø9.5					Ø15.9	Ø9.5
Ø19.0						Ø19.0
	Ø6.4	80	80	80			Ø6.4	80	80	80	80	80	80	80
[Liquid side]						[Liquid side]

RBM-H4071

RBM-H8071

[Gas side]

[Gas side]

449

769

Ø9.5

80

80

80

Ø9.5

80

80

80

80

80

80

80

Ø12.7

Ø12.7

Ø15.9

209

Ø15.9

Ø19.0

Ø19.0

Ø34.9

Ø34.9

Ø41.3

Heat insulator

Ø41.3

Heat insulator

522

842

Heat insulator

75

Heat insulator

Ø9.5

109

Ø9.5

Ø12.7

Ø12.7

Ø15.9

Ø9.5

Ø15.9

Ø9.5

Ø19.0

Ø6.4

Ø19.0

80

80

80

Ø6.4

80

80

80

80

80

80

80

[Liquid side]

[Liquid side]

T-shape Branch Joint

RBM-T129

[Gas side]

Ø54.1

Ø34.9

Ø54.1

Ø22.2

Ø54.1

Ø41.3

Ø28.6

Outside

Ø54.1

diameter

Ø34.9

3 pieces

2 pieces

included

included

[Liquid side]

Ø22.2

Ø15.9

Ø19.0

Ø9.53

Ø22.2

Ø22.2

Ø22.2

Ø12.7

Outside

Outside

diameter

Ø22.2

diameter

Ø15.9

3 pieces

2 pieces

included

included

[Balance side]

Ø9.52 Ø9.52 Ø9.52

Note: All dimensions in (mm)

GB

204

75

109

209

75

109

25

Installation

Piping

Connecting the Branching Kit

Y-shape Branching Joint

Y-shape Branching Joint for gas and liquid

distribution

GB

		To other Branching Pipe
		or Indoor Unit
	Outlet (1)
Piping at site		Piping at site
	Inlet
		Outlet (2)
		Y-shape branching joint for
		gas side/liquid distribution
To Outdoor Unit

When the selected pipe size differs from the size of the y-shape branching joint pipe, cut the centre of the connecting section with a pipe cutter, as shown below.

•Use the attached auxiliary pipe to adjust the pipe dia. of the Y-shape branching joint at gas or liquid side (RBM-Y071, RBM-Y129). Cut the branched pipe and auxiliary pipe to the specified size, and then braze.

Ø41.3	Ø41.3	Ø22.2
Ø34.9		Ø34.9

Ø19.0

Auxiliary pipe at gas side

Ø34.9	Ø12.7
Ø22.2	Ø15.9
	Ø19.0

Y-shape Joint for gas and liquid distribution

•Install Y-shape branching joint so that it branches horizontally or vertically.

or

B

A

(Horizontal line)

Within ± 30°

(A view)

(Horizontal line) Within ± 30° (B view)

•Be sure to fit the insulation to the Y-shape branching joint supplied in the kit.

•Cutting position

Cut at the centre

Cut the pipe at the centre of each connecting section, and remove burr.

Note: All dimensions in (mm)

26

Installation

Piping

Heat Insulating the Branching Pipes

Ensure the pipe insulation covers the piping up to the brazed accessory joints, as this will eliminate ingress of water – tape the pipe insulation to a thickness of 10mm or more, as shown.

RBM-Y129	(Gas side) (Prepared at site)
RBM-Y071	(Gas side, Liquid side),
RBM-Y129	(Liquid side)

	Seal the joint with	Heat insulating
	urethane foaming
		pipe for piping
	agent, etc.
		Seal with
	Pipe heat	vinyl tape
	insulator	Cut by
		approx.
		60°

Heat insulating		Cut by
	Bring them face	approx. 90°
pipe for piping
	to face

Use insulator with a heat resistance of 120° C or over for gas pipes. To insulate the Branching Pipes, use a T-Shaped Joint cover with a thickness of 10mm or over – or a machined insulation portion, as shown.

Place them edge to edge Place them edge to edge

Pipe heat insulator	Heat insulator	Pipe heat
prepared at site	included accessory	insulator
		prepared at site
150
Branching Pipe
		Place them
Heat insulator (prepared at site),		edge to edge
10mm or over

• After the heat insulating, tape to seal.

Taping
(prepared
at site)	Heat insulator
	(prepared
Heat insulator	at site)
(prepared at site)

Branching Header

Gas side

Prepared at site

Prepared at site

	To Indoor Unit
To Outdoor
Unit	Gas branching header

Liquid side

Prepared at site

Prepared at site

	To Outdoor	To Indoor Unit
		Liquid branching header
	Unit

When the selected pipe size prepared at site differs from the size of the branching header pipe, cut the centre of the connecting section with a pipe cutter

as shown.

If the number of Indoor Units to be connected is less than the number of connections on the Branching Header, braze a pipe cap to the unused connectors.

Gas side

Inlet

Pipe cap

B

Liquid side

B	Inlet	Pipe cap

GB

27

Installation

Piping

•Install the branching header so that it branches horizontally. DO NOT install vertically.

Gas side

(Horizontal line)

GB

(B view) Gas side

Liquid side

(Horizontal line)

(B view) Liquid side

•Be sure to insulate the branching header with the insulation provided.

•When routing the branching header at the liquid side from the opposite side, cut both ends and use a pipe cap (not supplied), as shown.

	A	B	C
To B	Cut	Cut	Cut

• Support of branching header

Set a hanging metal support (prepared at site) for the branching header, after fitting heat insulation.

• Cutting position

Cut the centre of each connecting section, and remove burr.

To C

Pipe cap

Notes:

Cut at the centre

Use a mini-cutter to cut branching headers up to Ø22.2.

1.Make sure there’s a straight run of pipe at least 300mm long at the inlet side of Y-shaped Branching Joints and Branching Headers.

2.Install Y-shaped Branching Joint so they branch horizontally or vertically. In horizontal installations, set within ± 30°.

3.Install Branching Headers so they branch horizontally.

4.Do not use T-shaped Branching Joints for Branching Sections.

5.When using Y-Branches or Header Branches to prevent incorrect piping, attach a line number or name to each pipe.

Note: All dimensions in (mm)

28

Installation

Piping

T-shape Branching Joint – to Connect Outdoor Units

Branching Pipes at Gas Side/Liquid Side

	Pipe prepared at site	To Outdoor Unit
	Connecting pipe at	To other Branching
	gas/liquid side
		Pipe or Outdoor Unit
		Pipe arranged at site
		Connecting pipe at gas/liquid side
	To other Branching	Branching Pipe at gas/liquid side
	Pipe or Branching
	Section of main pipe	Connecting pipe at gas/liquid side
	Pipe arranged at site
		To Outdoor Unit

•Use the included connecting pipes for gas/liquid sides to match to the appropriate pipe size. (The diagram shows a connecting example.)

GB

To other Branching				To other
Pipe or Branching				Branching Pipe
Section of main pipe				or Outdoor Unit

• Cutting position of connecting pipe

When the selected pipe size prepared at site differs from the size of the Branching Pipe, cut the centre of the connecting section with a pipe cutter.

Cut the centre

29

			Installation
			Piping
	Installation of Gas/Liquid Branching Pipes
	Inverter	Fixed-speed	Inverter	Fixed-speed
	Outdoor Unit	Outdoor Unit	Outdoor Unit	Outdoor Unit
GB

INCORRECT

ROUTING

Balancing Branch Pipes (Oil)

	To Outdoor	Pipe prepared
	Unit
		at site
		To other
		Branching Pipe
		or Outdoor Unit

When combining two units, connect directly.

Inverter Fixed-speed

Outdoor Unit Outdoor Unit

	To other	Pipe prepared
		at site	Connect
	Branching Pipe	Branching Pipe for	Balancing
	or Outdoor Unit		Pipe directly
		Balancing Pipe (included)
		Pipe prepared at site

Heat Insulation

Insulate liquid side, gas side and Balancing Pipes separately. Use insulator with a resistance of 120°C + for gas pipes.

To insulate the Branching Pipes, use a T-Shaped Joint cover with a thickness of 10mm or over

– or the machined one included. (Insulation for branching is not included.)

To prevent condensation or dripping – seal the Branching Pipe securely, with no gaps.

Heat insulating pipe for piping

Seal the joint with urethane foaming agent, etc.

Seal with vinyl tape

Heat insulating pipe for piping

Heat insulator

External dia. of

Branching Pipe

Drill a hole with dia. larger than external dia. of heat insulating pipe for piping

30