Toshiba MM-A0224HT, MM-A0280HT, MM-A0280HX SERVICE MANUAL

Modular Multi VRF System

Applications Manual

MMS-04AE-07-03

	Contents	Page	Chapter
	General Information	5		1
	Indoor Units – General	15		2
	4-Way Cassette	19		3
	2-Way Cassette	29		4
	Duct	33		5
	Slim Duct	37		6
	Ceiling	41		7
	High Wall	45		8
	Chassis	49		9
	Low Wall	53		10
	Capacity Correction	57		11
	Outdoor Units	71		12
	Piping Design	85		13
	Controls	98		14
	Electrical Wiring	113		15
	Selection Example	120		16
	Commissioning Procedure	132		17

4

General Information

Introduction	1

With the new Modular Multi System (MMS), Toshiba once again demonstrate that we are in touch with tomorrow. The design team looked to the future to develop a highly efficient, environmentally friendly system, with state of the art controls.

Linking the precision performance of their leading inverter technology with the functionality of fixed speed units,Toshiba have created a range of systems from 22.4 to 128.8 kW (8 to 46 hp). The inverter unit adjusts performance to match the desired output as each fixed speed unit operates as needed.

Modular Multi 2 pipe, heat pump and cooling only systems provide an economical solution to many of your heating and cooling needs and when combined with the Super Multi 3 pipe system, Toshiba covers the full spectrum of VRF applications.

5

General Information

Benefits of VRF

The Variable Refrigerant Flow (VRF) product segment is one of the fastest growing areas of the air conditioning industry due to the inherent flexibility of the system.

Specifiers are selecting this type of air conditioning product because it provides the economy and stability of a network system with the versatility of an independent system.

The system is ideal for variable load situations such as hotels, offices and shops.

VRF systems are compact and discreet which makes them ideal for applications when the air conditioning system is being retro-fitted to the existing building.

Since the air is conditioned locally there is no need for large ductwork throughout the building for the flow of heated/cooled air. Only small pipes are necessary to carry the refrigerant to the desired location. Because the air is cooled to the desired temperature at the point of use, the end user gets rapid, precise temperature control.

When integrated with control systems the performance can be optimised to achieve ultra low energy consumption, particularly when there is high diversity in the capacity demand.

Qualifies for enhanced

Capital Allowance

As a variable-speed drive system this product is on DEFRA’s Energy Technology Product list and entities the purchaser in the UK to a tax benefit under the ECA scheme, Further details are on the following website: www.eca.gov.uk

6

General Information
Benefits of the Modular Multi System				1
Environmentally Compatible

HFC Refrigerant

Toshiba is committed to designing and manufacturing products that will not harm our environment. All of our European air conditioning products use HFC refrigerants that have zero ozone depletion potential.

THE INVENTOR OF INVERTER-DRIVE AIRCON TECHNOLOGY

Refrigerant Detection and Containment System (RDC)TM

As an additional precaution an optional refrigerant detection system is available. This senses the air quality within a room and if refrigerant levels exceed preset limits, it will emit an audible alarm and transmit a signal that can activate auxiliary valves, isolating the indoor unit from the system and preventing further leakage to the environment.

Energy Efficiency

The inverter system reduces the energy consumption by adjusting output to match capacity demands.Toshiba’s research team has led the way in the development of inverter technology and continues to deliver products that are best in class.

7

General Information

Benefits of the Modular Multi System

Intelligent

Refrigerant Distribution System

Internal controls within each indoor unit monitor and manage the refrigerant flow through the system to optimise the distribution of refrigerant across the running units.This ensures consistent performance from all indoor units regardless of the number of units in service or the resistance of the piping network.

Pressure and Temperature Sensor Control

•Checks pressure and refrigerant temperature of each indoor unit for optimal capacity control.

8

General Information
Benefits of the Modular Multi System	1

Interactive Controls

The system is available with Interactive Intelligence, Toshiba’s range of sophisticated controls.The userfriendly software with a Windows® based platform allows management of up to 1,024 indoor units (up to 64 zones with 16 units per zone).The entire air conditioning network can be programmed to meet the end user’s needs.These controls are interactive; two-way communication enables your system to send you regular updates through the internet via your PC or mobile telephone. Service engineers can be notified of system status and any necessary action can be taken before it becomes evident to the user.

Up to 64 zones (allowing up to 16 units per zone)

Energy Monitoring

•The power consumption of each individual indoor unit can be monitored allowing energy bills for shared systems to be sub-divided across multiple occupants.

•Building managers can identify high-use systems and investigate potential opportunities for energy savings.

Up to 16 gateway interfaces

•An energy meter connected to each outdoor system measures its usage (kW/h) and the energy consumption is proportioned to the indoor units based on their capacity demand.

•A billing package is already included with the software, which allows billing on a multiple-tariff basis.

Internet Access

This feature is ideal for building management services with more than one site.

•Remote monitoring and control is possible for multiple users at any one time using Microsoft Internet Explorer®

•Various levels of access are permitted for security

•Immediate access to operating conditions and historical performance. Allows rapid response to user enquiries.

Diagnostics

The network can also be linked to DD III,Toshiba’s system interrogation software allows the service engineers to gain access to critical system parameters to monitor the functions of the unit.

9

General Information

Benefits of the Modular Multi System

Reliable

Toshiba Quality

Toshiba’s reputation for quality has been established over 125 years of delivering reliable products.We maintain the highest standards in every aspect of our business, to ensure total customer satisfaction and continuously search for new ways in which to improve our customer offering.Toshiba believe in listening to customers, and working with them to make our products and services the very best they can be.

Reliability by Design

Toshiba uses the latest techniques and analysis tools to build reliability into the products and the processes from the very outset. Our products are built to last and serve you well beyond the minimum specification requirements.

Oil Management System

The MMS has an oil-balancing network to ensure the oil is evenly distributed across the outdoor units; thereby extending the life of the product.This system is outlined in greater detail in chapter 12.

Diagnostics

Our advances in control and monitoring equipment have produced state of the art system maintenance, designed to minimise downtime. Interactive Intelligence and DD III allow the end user to monitor trends in performance data that might signal that action should be taken.

10

General Information

Benefits of the Modular Multi System	1

Versatile

	lengthMaximum	branchfirstafter	lengthpipingMaximum	8F	differenceheightMaximum	unitsindoorbetween
				7F
				6F
				5F
				4F
				3F		30m
				2F
		50m	100m
				1F

Maximum height difference b/w

outdoor and indoor units

50m

Design Flexibility

The unique refrigerant distribution control allows for a wide variety of piping options:

•Up to 40 indoor units per system

•Allowable height difference between indoor and outdoor units 50 m (outdoor unit above) or 30 m (outdoor unit below)

•Up to 30 m height difference between indoor units

•Equivalent length of 125 m (100 m actual) between outdoor unit and furthest indoor unit

•Vertical distance of up to 4m permitted between outdoor units

•Total pipework network of up to 250 m

Piping Possibilities

The indoor unit network can be designed with Y-joints after headers and headers after headers. The possibilities are endless thanks to the refrigerant distribution system that compensates for the variation in pipe resistance and balances the flow across the entire network.

Y joint branch after header branch

Header branch after Y joint

(Toshiba unique technology)

Header branch after header branch (Toshiba unique technology)

Expandability

The system is modular so it can be expanded as needed. Installations can also be staged to allow sequential installation. This is ideal for refurbishment situations when disruption of business operation must be minimised. It also allows for flexibility should the floor layout be modified at a later date.

11

General Information

Benefits of the Modular Multi System

Economical

Installation Savings

There are potential installation savings with the MMS, due to the additional network piping possibilities and the reduction in the number of pipes connecting the outdoor units to the indoor network.

Capacity Range

The variation of outdoor unit combinations allows MMS to meet system capacity demands from 22.4 to 128.8 kW (8 to 46 hp) in nineteen increments. This allows the system capacity to match your exact needs, reducing product costs.

Overview of the 19 Modular Multi System Configurations

OUTDOOR SYSTEM			INVERTER			FIXED			Total connected code
CAPACITY			28 kW (10 hp)	22.4 kW (8 hp)	28 kW (10 hp)	22.4 kW (8 hp)	16 kW (6 hp)	Maximum No.
Cooling only (no heating)		Code	MM-A0280CT	MM-A0224CT	MM-A0280CX	MM-A0224CX	MM-A0160CX	of indoor
Cooling	Heating*	hp	MM-A0280HT	MM-A0224HT	MM-A0280HX	MM-A0224HX	MM-A0160HX	units	Min	Max
22.4	25.0	8		1				13	4	10.8
28.0	31.5	10	1					16	5	13.5
38.4	43.0	14		1			1	16	7	18.9
44.8	50.0	16		1		1		18	8	21.6
50.4	56.5	18	1			1		18	9	24.3
56.0	63.0	20	1		1			20	10	27.0
60.8	68.0	22		1		1	1	22	11	29.7
67.2	75.0	24		1		2		24	12	32.4
72.8	81.5	26	1			2		26	13	35.1
78.4	88.0	28	1		1	1		28	14	37.8
84.0	94.5	30	1		2			30	15	40.5
89.6	100.0	32		1		3		32	16	43.2
95.2	106.5	34	1			3		34	17	45.9
100.8	113.0	36	1		1	2		36	18	48.6
106.4	119.5	38	1		2	1		38	19	51.3
112.0	126.0	40	1		3			40	20	54.0
117.6	131.5	42	1			4		40	21	56.7
123.2	138.0	44	1		1	3		40	22	59.4
128.8	144.5	46	1		2	2		40	23	62.1

* Heating capacities only apply to heat pump systems

Conditions

The capacities are based on Eurovent conditions: Cooling: Indoor air entering temperature 27°C db, 19°C wb, outdoor air temperature 35°C db Heating: Indoor air entering temperature 20°C db, outdoor air temperature 7°C db, 6°C wb

Unit operating range

Indoor	Outdoor
Cooling	Cooling
Maximum: 32°C db, 22.5°C wb	Maximum: 43°C db
Minimum: 18°C db, 15.5°C wb	Minimum: -5°C db
Relative humidity:
Maximum: 80%
Heating:
Maximum: 29°C
Minimum: 15°C

990 mm

1700 mm

750 mm

12

General Information

Benefits of the Modular Multi System	1

Small Riser Space

Example for a 84 kW (30 hp) system

50% Reduction in Riser Space

Space Saving, Compact Design

The compact Modular Multi outdoor units have a small footprint so they can fit into tight working spaces, thus freeing premium floor space for other usage. A single set of pipes connects the outdoor series to the indoor unit network, minimising the riser space required.

Example for a 84kW (30HP) system

300mm

Smaller

than

1.55m

competitors

10mm

20mm

20mm

10mm

500mm

3.03m

Units will fit in 90% of the world's lifts

13

General Information

Benefits of the Modular Multi System

Applying the Modular Multi System is easy. The following flowchart outlines the basic steps of the process, which are typical for almost all air conditioning applications.This manual is structured with separate chapters focusing on each of the steps along with a separate chapter on each type of indoor unit.We have also included a chapter which outlines an example of an MMS application.

Zoning

Indoor unit selection

Capacity correction

As with all air conditioning applications, proper zoning is important. Indoor units connected to a common system should have similar loading characteristics, thus minimising the potential for conflicting demand.

Indoor units are selected based on the predicted heat load as well as the style and layout of the space to be air conditioned. Air distribution and sound level characteristics may also be factors for consideration.

Indoor unit capacity will be adjusted based on the expected length and height of pipe runs and environmental conditions.

Outdoor unit selection

Piping design

Controls selection

Wiring design

The outdoor unit capacity is then determined, based on the expected demand.This is calculated by summing the capacity of the indoor network and predicting the peak load.

The piping network for the indoor units will be based on the zoning requirements and building layout. Numerous options are available due to the flexibility of the system.

The controls selection is dependent on the specification. Toshiba has a wide range of control systems available and has collaborated with customers on the development of unique systems to meet specific application requirements.

Each of the indoor and outdoor units will have its own power supply. Control wiring requirements will be determined by the controls selection.

14

Indoor units

Intelligent Indoor Units

The Modular Multi System indoor units are compatible with both the Cooling Only and Heat Pump outdoor	2
units. The MMS dedicated indoor range has precise capacity control.

Each MMS indoor unit has the following additional components:

•Pressure and temperature sensors to determine the superheat conditions of the refrigerant

•A pulsed modulating valve (PMV) to optimise refrigerant flow

•A printed circuit board to communicate system parameters and demand to the outdoor system

Pulsed modulating valve

Temperature sensors

Pressure sensor capillary

The added intelligence of the indoor units provides precise capacity control without a multi controller unit. Localised sensing of the refrigerant conditions and internal controls provide excellent performance in all conditions.The units compensate for the piping resistances allowing greater flexibility in piping design. Communication between the indoor and outdoor network means greater performance and efficiency as system output closely matches the demand of the indoor network.

Modular Multi System

Very good capacity control because of the indoor unit knows the exact superheat value through constant monitoring of the coil temperature sensors and the pressure sensor. This allows the PMVs to adjust and account for all resistance in the circuit and achieve the desired capacity.

Localised

•Pressure measurement

•Temperature measurement

•Refrigerant flow adjustment

System compensates for high pipe resistance

15

Indoor Units

	Model Type				Model		Capacity		Cooling		Heating		Height		Width		Depth		Weight
					Name		Code		Capacity		Capacity		mm		mm		mm		kg
									kW		kW
	4-way Cassette*				MM-U056		1.0		2.8		3.2	259			820		820		25
							1.25		3.5		4.0
							1.5		4.2		4.8
							1.7		4.8		5.4
							2.0		5.6		6.4
					MM-U080		2.5		6.7		8.0
							3.0		8.0		9.6
					MM-U112		3.2		9.0		10.2	309			1230		820		43
							4.0		11.2		12.8
					MM-U140		5.0		14.0		15.8
	Concealed Duct				MM-B056		1.0		2.8		3.2	345			770		875		39
							1.25		3.5		4.0
							1.5		4.2		4.8
							1.7		4.8		5.4
							2.0		5.6		6.4
					MM-B080		2.5		6.7		8.0	345			1070		875		53
							3.0		8.0		9.6
					MM-B112		3.2		9.0		10.2	345			1420		875		58
							4.0		11.2		12.8
					MM-B140		5.0		14.0		15.8	345			1420		875		62
	2-way Cassette				MM-TU028		0.8		2.2		2.6	190			910		480		23
							1.0		2.8		3.2
					MM-TU042		1.25		3.5		4.0
							1.5		4.2		4.8
					MM-TU056		1.7		4.8		5.4
							2.0		5.6		6.4
	High Wall*				MM-K/KR042		0.8		2.2		2.6	372			1150		226		20
							1.0		2.8		3.2
							1.25		3.5		4.0
							1.5		4.2		4.8
					MM-K/KR056		1.7		4.8		5.4
							2.0		5.6		6.4
					MM-K/KR080		2.5		6.7		8.0	372			1478		226		26
							3.0		8.0		9.6
	Ceiling*				MM-C/CR042		0.8		2.2		2.6	188			1030		640		24
							1.0		2.8		3.2
							1.25		3.5		4.0
							1.5		4.2		4.8
					MM-C/CR056		1.7		4.8		5.4
							2.0		5.6		6.4
					MM-C/CR080		2.5		6.7		8.0	188			1230		640		28
							3.0		8.0		9.6
					MM-C/CR 112		4.0		11.2		12.8	240			1430		640		39
					MM-C/CR140		5.0		14.0		15.8	240			1630		640		44
	Floor Low Wall*				MM-S/SR056		1.0		2.8		3.2	640			1030		188		24
							1.25		3.5		4.0
							1.5		4.2		4.8
							1.7		4.8		5.4
							2.0		5.6		6.4
					MM-S/SR080		2.5		6.7		8.0	640			1230		188		28
							3.0		8.0		9.6
	Chassis				MM-N028		0.8		2.2		2.6	600			750		230		21
							1.0		2.8		3.2
					MM-N042		1.25		3.5		4.0	600			1050		230		25
							1.5		4.2		4.8
					MM-N056		1.7		4.8		5.4	600			1050		230		29
							2.0		5.6		6.4
					MM-N080		2.5		6.7		8.0
							3.0		8.0		9.6
	Slim Duct				MM-SB028		0.8		2.2		2.6	220			800		500		22
							1.0		2.8		3.2

* These units are available with infrared remote control. For the four-way cassette unit a separate infrared panel is required.

16

Indoor Units

De-rating

1.The Modular Multi indoor units have a de-rating option that can be implemented to match actual load

requirements.The full output range including the de-rated units is outlined in the table shown.

2

2.When an indoor unit is derated the initial opening pulse of the indoor unit PMV is adjusted according to the capacity rating.

3a. In cooling code, the PMV pulse is then adjusted along with the inverter compressor frequency to ensure optimum superheat conditions at each indoor unit.

3b. In heating mode, the PMV pulse is then adjusted along with the outdoor unit PMV & inverter frequency to ensure the optimum subcooling condition at each indoor unit.

Total Cooling kW	2.2		2.8	3.5	4.2	4.8	5.6	6.7	8.0	9.0	11.2	14.0
Sensible Cooling kW	1.7		2.1	2.6	3.2	3.6	4.2	5.0	6.0	6.8	8.4	10.5
4-way Cassette
2-way Cassette
Duct/Slim Duct*
High Wall
Ceiling
Chassis
Floor/Low Wall
Heating kW	2.6		3.2	4.0	4.8	5.4	6.4	8.0	9.6	10.2	12.8	15.8
Capacity Code Setting	0.8		1.0	1.25	1.5	1.7	2.0	2.5	3.0	3.2	4.0	5.0
STANDARD CAPACITY SETTING				OUTPUT ACHIEVED BY DE-RATING
* Slim Duct indoor unit available in 2.8 kW standard and 2.2 kW de-rated capacities
Note: Indoor unit system capacity may be between 50 and 135% of the connected outdoor units.

17

Indoor Units

Part Numbering

The indoor unit part numbering system is defined as follows:

MM

-

U

056

Product Designation

Unit Type

Cooling Capacity (STD)

MM Modular Multi

B

Duct

028

2.8 kW

C

Ceiling

042

4.2 kW

F

Floor

056

5.6 kW

K

High Wall

080

8.0 kW

N

Chassis

112

11.2 kW

S

Low Wall

140

14.0 kW

SB

Slim Duct

TU

2-way Cassette

U

4-way Cassette

An R next to the unit

designation indicates a unit

with an infrared controls

option

Location Precautions

Avoid installing the indoor unit in the following locations:

•Where there is danger of flammable gas leakages.

•Where there are high concentrations of oil.

•Where the atmosphere contains an excess of salt.

•Where high concentrations of organic solvent are present.

•Where a machine that generates high frequencies is operated.

•Where the unit will not be horizontal.

•Where the floor/wall/ceiling structure is unable to support the weight of the unit.

•Where it is not possible to fix the unit hangers, e.g. window glass.

Locate the unit to ensure uniform circulation of conditioned air.

18

Four-Way Cassette

• Slim design

• Highly efficient drain pump

• 2-, 3- and 4-way air distribution

3

•Ultra quiet

•Slim one-piece easy-to-clean panel

•Threaded drain connection as standard

•Long-life washable air filter

•Synchronised motor-driven louvres

•Fresh air intake facility

•Branch duct option

•Easy access to components

•Infrared controls option via panel RBC-UxxxPGR

•Modular Multi dedicated indoor unit. Monitors pressure and temperature and adjusts refrigerant flow to optimise performance locally.

MODEL		MM-U056					MM-U080		MM-U112		MM-U140
Cooling Capacity	kW	2.8	3.5	4.2	4.8	5.6	6.7	8.0	9.0	11.2	14.0
Heating Capacity	kW	3.2	4.0	4.8	5.4	6.4	8.0	9.6	10.2	12.8	15.8
Capacity Code		1.0*	1.25*	1.5*	1.7*	2.0	2.5*	3.0	3.2*	4.0	5.0
Sensible Cooling	kW	2.1	2.6	3.2	3.6	4.2	5.0	6.0	6.8	8.4	10.5
Airflow Rate H	m3/h	1020	1020	1020	1020	1020	1260	1260	1750	1750	1860
Airflow Rate M	m3/h	890	890	890	890	890	1140	1140	1520	1520	1620
Airflow Rate L	m3/h	830	830	830	830	830	1020	1020	1360	1360	1510
Unit Weight	kg	25	25	25	25	25	25	25	43	43	43
Height	mm	259	259	259	159	259	259	259	309	309	309
Width	mm	820	820	820	820	820	820	820	1230	1230	1230
Depth	mm	820	820	820	820	820	820	820	820	820	820
Air Filter		Washable, 500 µm
Gas Connection	mm	ø12.7 (1/2”)					ø15.9 (5/8”)		ø19.0 (3/4”)		ø19.0 (3/4”)
Liquid Connection	mm	ø 6.4 (1/4”)					ø 9.5 (3/8”)		ø 9.5 (3/8”)		ø 9.5 (3/8”)
Drain Connection	mm	Male 25.4 (1” BSP)

PANEL TYPE		RBC-U264PG/PGR**(W)-E							RBC-U464PG/PGR**(W)-E
Air Filter		Washable - 500 µm								Washable - 500 µm
Panel Weight	kg	6	6	6	6	6	6	6	8	8	8	8
Panel Height	mm	20	20	20	20	20	20	20	20	20	20	20
Panel Width	mm	940	940	940	940	940	940	940	1350	1350	1350	1350
Panel Depth	mm	940	940	940	940	940	940	940	940	940	940	940

*Setting shown is de-rated and adjustment must be made during installation/commissioning.

**Panel with R designation has infrared controls

19

Four-Way Cassette

Acoustic Data

									Sound
MM-U056	Sound Power Level (SWL) - dB								Pressure Level
	125 Hz	250 Hz	500 Hz	1000 Hz	2000 Hz	4000 Hz	8000 Hz	SWL	SPL (dBA)	NC*
Low	38.3	36.5	27.7	24.8	21.9	16.1	16.5	37.5	32	22
Med	39.5	38.8	30.2	28.7	23.3	16.4	16.6	39.7	35	24
High	41.1	41.2	33.6	32.6	26.4	18.7	17.8	42.7	38	29
MM-U080
	125 Hz	250 Hz	500 Hz	1000 Hz	2000 Hz	4000 Hz	8000 Hz	SWL	SPL (dBA)	NC*
Low	40.5	40.8	33.1	35.7	28.4	20.0	21.5	42.9	35	32
Med	43.1	45.4	38.1	36.9	30.4	22.5	21.9	46.4	39	33
High	44.0	48.1	40.7	39.4	32.6	25.0	21.3	48.9	43	36
MM-U112
	125 Hz	250 Hz	500 Hz	1000 Hz	2000 Hz	4000 Hz	8000 Hz	SWL	SPL (dBA)	NC*
Low	45.4	41.6	37.7	33.1	26.0	18.9	20.1	44.4	37	29
Med	50.4	44.1	40.6	37.1	30.0	21.8	20.2	47.4	40	34
High	52.6	44.9	41.5	38.5	31.5	23.8	20.5	48.6	42	35
MM-U140
	125 Hz	250 Hz	500 Hz	1000 Hz	2000 Hz	4000 Hz	8000 Hz	SWL	SPL (dBA)	NC*
Low	47.8	45.7	42.9	36.5	29.6	25.1	19.1	47.7	40	33
Med	51.8	46.8	45.7	40.0	32.0	26.0	19.8	50.0	43	36
High	52.8	47.4	45.6	40.5	32.9	26.8	19.9	50.6	45	37

* For all practical purposes NR and NC curves may be regarded as mutually interchangeable. (Ref: CIBSE Guide Vol. B, page12-4. )

dB(A)	50	MM-U056						dB(A)	50
	40								40
Level						NC-40		Level
	30								30
Pressure						NC-30	H	Pressure
							M
	20						L		20
						NC-20
Sound	10					NC-10		Sound	10
	0								0
		125	250	500	1000	2000 4000 8000

Frequency (Hz)

dB(A)	50	MM-U112						dB(A)	50
	40								40
Level						NC-40		Level
	30						H		30
							M
Pressure						NC-30		Pressure
							L
	20					NC-20			20
Sound	10					NC-10		Sound	10
	0								0
		125	250	500	1000	2000 4000 8000

MM-U080
				NC-40	H
					M
				NC-30	L
					1.5m
				NC-20	Microphone
				NC-10
125	250	500	1000	2000 4000 8000

Frequency (Hz)

MM-U140
				NC-40	H
					M
					L
				NC-30
				NC-20
				NC-10
125	250	500	1000	2000 4000 8000

Frequency (Hz)

Frequency (Hz)

20

Four-Way Cassette

Air Distribution Control

Conditioned air can be distributed through 2, 3 or 4 sides of the unit to optimise the flow distribution in a room. Insulation blocks are included with the unit to close off the airflow to certain sides of the unit.The diagram below defines which sides of the unit may be closed for each of the capacities.

Choose the number of airflows that are required, depending on the shape of the room and the location of

3

the indoor unit.

MM-U056/U080

MM-U112/U140

3-way

3-way

3-way

3-way

3-way

2-way

3-way

2-way

2-way

•It is not possible to block the airflow from the longer sides of the unit (U112/U140).

• Insert insulation blocks, which are supplied as

accessories, at each side where the airflow is Insulation Block not required as shown in the diagram

opposite.

In addition, a motorised louvre facility allows the air to be directed in either a pre-set or a sweep pattern. Cassettes also have a branch duct facility for better air distribution in irregular shaped rooms.The combination of these two features gives the occupants total control over air movement within the room, via an easy-to-use remote controller.

21

Four-Way Cassette

Air Distribution

Note: Air velocity data collected at high fan speed.

MM-U056

Air velocity (m/s)

2.7m

(m)	2
Height		1.0
	1	0.5
		0.3	0.1

MM-U080

Air velocity (m/s)

2.7m

(m)	2
Height		1.0
	1	0.5	0.1
		0.3

0	1	2	3	4	5	0	1	2	3	4	5
	Distance (m)						Distance (m)
MM-U112						MM-U140
	Air velocity (m/s)						Air velocity (m/s)

2.7m

(m)	2
Height	1

0

					2.7m
	1.0				(m)	2
					Height	1	1.0
	0.5										0.1
								0.5
		0.3		0.1					0.3
1	2	3	4	5		0	1	2	3	4	5

Distance (m)

Distance (m)

Design Features

Flexible Air Distribution

Conditioned air can be distributed through 2, 3 or 4 sides of the unit. In addition, a motorised louvre facility allows the air to be directed in either a pre-set or a sweep pattern. Cassettes also have a branch duct facility for better air distribution in irregular shaped rooms.The combination of these two features gives the occupants total control over air movement within the room via an easy-to-use remote controller.

Fresh Air Facility

An additional advantage of Toshiba’s 4-way cassettes is that outdoor air, as well as conditioned air, can be introduced into the room. (Tempering to 15°C minimum is recommended.)

Quiet Operation

Noise levels have been reduced dramatically, thanks to the specially designed fan inlet that smoothes the airstream as it flows into an aerofoil fan and aerodynamic louvres.

Performance Tuning

Units are preset to a standard setting, however capacity code adjustments can be made to optimise cooling or heating.

Precise Capacity Control

Each indoor unit has pressure and temperature sensors for localised monitoring of refrigerant condition. A pulsed modulating valve (PMV) controls the refrigerant flow and the capacity demand is communicated to the outdoor system. This ensures excellent performance at all conditions. A 3-speed fan controls the cooled airflow volume automatically or manually (4-speed heating mode). Even at the highest fan speed, the unit is quiet in operation.

Easy to Install and Maintain

The 4-way cassette can be concealed within most ceiling voids, with an ultra-thin 20 mm grille. This onepiece panel is easy to install. Its surface is easy to wipe clean, a feature it shares with the synchronised louvre blades.The long-life washable filter also minimises maintenance.

22

Four-Way Cassette

Dimensional Drawings

MM-U056, MM-U080

	connection		connection		200
	Refrigerantflare		Refrigerantflare
		A)ø(Gas		ø(LiquidB)	140
					73
185	170	100				holes)
						connection plate3xø20
						Wiring (Gland	(25.4mmBSPthreadedconnection)
		80			138	pipeDrainconnection
					240

	246.5	Ceiling
	195
4-M10
Hangingbolts
106			sides)
106			(both150ø
	30		forsideducts
259		20	kout
		39	Knoc
160	138
	298

80	10
	4-ø6

32 ø 100

Note: All dimensions are in mm.

	940
940 (P anel dimension)
880 (Ceiling opening)
820 (External cassette dimension)
800 (Hanger bolt pitch)
195	268

405

400

536

	40
	30
ø 144				ø 200
				6
	ø 30
	2	80	10	30
	30			ø 150
		ø6
	ø 97			°
		6-
				45
	size			180	size
				ø
	ductinletairFresh		180ø		ductoutletSide
				45°
130
	ø
ø	144
	130
			°	45°
130			45

940

Condensate pipe 1 ″ BSP threaded connection

536	620(Hangerboltpitch)	(Externalcassettedimension)	880(Ceilingopening)	940(Paneldimension)
		820

inlet	130	30
reshair
F

			MM-U080	15.9(5/8”)	6.4(1/4”)
U056 U080	12.7(1/2) 15.9(5/8)	6.4(1/4) 6.4(1/4)	MM-U056	12.7(1/2”)	6.4(1/4”)
Model(MM-)	øA	øB Dimensions mm		øA	øB

3

23

Four-Way Cassette

Dimensional Drawings

MM-U112, MM-U140

	Refrigerantflareconnection	(Gasside19(3/4))
185	170	100

80

Hanging bolts 4-M10

941

106

Knock out for side ducts ø 150 (both sides)

	flareconnection	9.5(3/8))	140
	Refrigerant	side(Liquid	200
			73

138

240

246.5 202 30

106

	30
210	138
309
348

							80	10
							6-ø6
connection plate3xø20holes)			1350
Wiring (Gland
connection)
connectionpipeDrain BSP.4mm(25″threaded	940
		BSP
Ceiling	940 (P anel dimension)	Condensatepipe1″ threadedconnection
	880 (Ceiling opening)
	820 (External cassette dimension)
	800 (Hanger bolt pitch)
Ceilingpanel							80	10
	610 605		940	1030(Hangerboltpitch)	(Externalcassettedimension)	1290(Ceilingopening)	1350(Panelopening)	4-ø6
					1230		100
							ø
							32
	30
	40		130
20	inlet	30
	air
39
	Fresh

ø 180

45 °

ø 200
6
30
ø 150
45°	size
ø180	outletduct
45°
	Side

45 °

		ø 144
		ø 30
			2
			30
		ø 97
	130		ductsize
			inlet
		ø
	ø	144	air
			Fresh
			130
	130

15mmormore
Ceiling	1000 mm or more

	1000 mm	1000 mm
Obstacle	or more	or more

Note: All dimensions are in mm.

24

Four-Way Cassette

Drain Piping

Precautions

Ensure that the entire indoor drain piping is correctly heat-insulated otherwise condensation may result. Also, insulate the section which connects it to the indoor unit.

	If nylon cable ties are used to secure the insulation, take precautions not to over-tighten them because					3
	deformation of the heat insulation will reduce its effectiveness.
	Take care not to apply excessive force or pressure at the unit side where the drain piping exits the indoor
	unit.
	The drain piping must be placed on a downward gradient (1/100 or greater) and there should be no
	upward or downward curves in the pipe which obstruct the drainage, unless a drain pump is employed.
	The drain pipe should be sufficiently supported to prevent warpage.
	When one drainage system is used for a multiple of indoor units, install the piping as shown below:
		15-20 m	Upward curve	Make this distance as long as possible – approx. 100 mm
			Support clamp X
	Insulator
			Downward curve		Downward gradient 1/100 or greater
	Downward gradient 1/100 or greater
	Piping Material and Heat Insulator
		Heat Insulator*	Hard PVC pipe**	*	Heat Insulator:
					Polyethylene foam (thickness 6 mm)
				**	Piping Material:
					Hard PVC pipe nominal diameter inside Ø20 mm
	Drain pan	Drain hose	Hard PVC adhesive

Connection to the unit is via a 1” BSP male connection – to ensure a waterproof seal, PTFE thread tape should be used.The maximum lift of the condensate pump from the drain outlet is 360 mm and the maximum overall lift from the underside of the ceiling to the centre of the drain piping is 600 mm.These values must not be exceeded, otherwise unit flooding will occur when the drain pump is switched off.

360 mm (max.) 600 mm (max.)

100 mm (max.)

Cassette

Ceiling

25

Four-Way Cassette

Fresh Air Inlet

These models have a cut out hole in the cabinet to enable outdoor air to enter the indoor unit at a maximum rate of 10% of selected air by volume. Before installing the unit, remove the cut out hole and insulation block and fit a spigot to connect the duct before hanging the unit. (Tempering incoming air to 15°C minimum is recommended.)

Details of Cut-Out Hole

The cut out hole is a ‘D’ shape half-cut hole on the side of the indoor unit, located on the side opposite the pipework.

Drain Pan

Insulation Block

Fresh Air Inlet

Add a spigot to the side of the indoor unit and attach using the 4 screw holes as shown below:

32 ø100

130

ø144

130

4-ø6	80
	10
ø130	ø130	ø144
ø97
	30
	2

Note: All dimensions are in mm.

26

Four-Way Cassette

Air Outlet Duct

A portion of airflow can be redirected via the air outlet duct. Before installing the unit, remove the cut out hole and fit a spigot to connect the duct before hanging the unit.

Details of Cut-Out Hole

The cut out hole is a rectangular shape half-cut hole located on two sides if the unit.

3

Air outlet duct

Add a spigot to the side of the indoor unit and attach using the 6 screw holes as shown:

45°

ø 180

45°

45°

6-ø6	80
	10

ø180

ø150

ø200

45°	30

6

Air Outlet Spigot (ø150)

Note: All dimensions are in mm.

27

28

Two-Way Cassette

•Designed and developed for use with the nonozone depleting refrigerant, R407C

•Quiet in operation

•Adjustable air distribution

•Compact – 190 mm void space required

4

•Motorised louvres

•Ideal for refurbishment and new build

•Easy to install and maintain

•Slim-line grille (25 mm)

•Modular Multi dedicated indoor unit. Monitors pressure and temperature and adjusts refrigerant flow to optimise performance locally.

MODEL		MM-TU028		MM-TU042		MM-TU056
Cooling Capacity	kW	2.2	2.8	3.5	4.2	4.8	5.6
Heating Capacity	kW	2.6	3.2	4.0	4.8	5.4	6.4
Capacity Code		0.8*	1.0	1.25*	1.5	1.7*	2.0
Sensible Cooling	kW	1.7	2.1	2.6	3.2	3.6	4.2
Airflow Rate H	m3/h	550	550	700	700	750	750
Airflow Rate M	m3/h	500	500	635	635	681	681
Airflow Rate L	m3/h	445	445	567	567	607	607
Weight	kg	23	23	23	23	23	23
Height	mm	190	190	190	190	190	190
Width	mm	910	910	910	910	910	910
Depth	mm	480	480	480	480	480	480
Air Filter		Washable - 500 µm		Washable - 500 µm		Washable - 500 µm
Gas Connection	mm	ø12.7 (1/2")		ø12.7 (1/2")		ø12.7 (1/2")
Liquid Connection	mm	ø6.4 (1/4")		ø6.4 (1/4")		ø6.4 (1/4")
Drain Connection	mm	ø25.5 OD		ø25.5 OD		ø25.5 OD

PANEL TYPE		RBC-U134PG(W)-E		RBC-U134PG(W)-E		RBC-U134PG(W)-E
Panel Dimensions
Height	mm	25	25	25	25	25	25
Width	mm	1050	1050	1050	1050	1050	1050
Depth	mm	550	550	550	550	550	550
Unit Weight	kg	23	23	23	23	23	23
Panel Weight	kg	4.5	4.5	4.5	4.5	4.5	4.5
Panel Depth
Below Ceiling	mm	25	25	25	25	25	25
Panel Colour		Silky White (Munsell 2.9Y8.9/0.8)
Air Filter		Washable

29

Two-Way Cassette

Acoustic Data

									Sound
MM-TU028	Sound Power Level (SWL) - dB								Pressure Level
	125 Hz	250 Hz	500 Hz	1000 Hz	2000 Hz	4000 Hz	8000 Hz	SWL	SPL (dBA)	NC*
Low	31.0	35.3	30.5	24.6	20.0	19.8	21.3	37.1	34	25
Med	31.5	36.9	35.2	27.5	21.3	19.2	21.4	39.0	36	25
High	38.0	41.1	38.5	35.7	26.6	20.6	22.0	45.0	40	32
MM-TU042
	125 Hz	250 Hz	500 Hz	1000 Hz	2000 Hz	4000 Hz	8000 Hz	SWL	SPL (dBA)	NC*
Low	25.5	36.8	33.2	29.6	23.6	21.4	21.7	39.8	34	25
Med	29.7	39.7	35.5	33.1	26.1	21.9	21.7	42.6	36	29
High	35.5	43.1	39.4	39.0	32.0	23.9	20.8	47.3	40	35
MM-TU056
	125 Hz	250 Hz	500 Hz	1000 Hz	2000 Hz	4000 Hz	8000 Hz	SWL	SPL (dBA)	NC*
Low	27.0	36.7	33.9	34.2	24.6	20.6	21.1	41.6	35	31
Med	29.8	38.8	35.0	35.8	25.6	19.0	17.8	43.1	37	32
High	36.0	42.5	38.9	40.4	31.1	23.2	18.8	47.7	41	36

* For all practical purposes NR and NC curves may be regarded as mutually interchangeable. (Ref: CIBSE Guide Vol. B page B12-4.)

dB(A)	50	MM-TU028						dB(A)	50
	40								40
Level						NC-40	H	Level
	30						M		30
Pressure						NC-30		Pressure
	20						L		20
						NC-20
Sound	10					NC-10		Sound	10
	0								0
		125	250	500	1000	2000 4000 8000

MM-TU042
				NC-40	H
					M
				NC-30	L
				NC-20
				NC-10
125	250	500	1000	2000 4000 8000

Frequency (Hz)

Frequency (Hz)

dB(A)	50	MM-TU056
Level	40					NC-40	M
							H
Pressure	30					NC-30	L
	20					NC-20
Sound	10						1.5m
						NC-10	Microphone
	0	125	250	500	1000	2000 4000 8000

Frequency (Hz)

30

Two-Way Cassette

Dimensional Drawings

MM-TU028, MM-TU042, MM-TU056

Refrigerantflareconnection		Refrigerantflareconnection	12.7(1/2))ø(Gas	Wiringconnection	131		anelouterdimension1050	20	40	110	66	73
	(Liquidø6.4(1/4))	267	186		96			Ceilingopening1010	Hangboltpitch930	Unitdimension840	90	200	600	Minimum
pipejoint	ø25.5	170					P			70	40				installation
Drain					156			20	40		Hang bolt pitch 410
											Unit dimension 480
					190	25					Ceiling opening 510				and
											Panel outer dimension 550
Hangerbolt	(4-M10)				131								600	Minimum	requiredforservice
												ViewA			Space
		840					A			1050
											TOSHIBA
		70

190

550

600 Minimum

	110
480	290
	80

Note: All dimensions are in mm.

4

31