Toshiba MM-A0280HT User manual

Service Manual
Air Conditioner – Multi Split Type System
Modular Multi System
HFCR407C
A90-0130

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Contents
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Outline of MMS (Modular Multi System) . . . . . . . . . . . . . . . . . . . 8
Parts Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Construction Views – Outdoor Units . . . . . . . . . . . . . . . . . . . . . . 14
Construction Views – Indoor Units. . . . . . . . . . . . . . . . . . . . . . . . 15
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Refrigerant Piping Systematic Drawings . . . . . . . . . . . . . . . . . . 25
Combined Refrigerant Piping Systematic Drawings . . . . . . . . 28
Refrigerant Cycle Schematic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Outline of Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Self Diagnostic Display Information . . . . . . . . . . . . . . . . . . . . . . 46
Control Circuit Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Backup Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Forced Function of Oil Level Detection. . . . . . . . . . . . . . . . . . . 105
Refrigerant Pipe Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Trial Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Exploded Views and Service Parts. . . . . . . . . . . . . . . . . . . . . . . 124
Additional Literature and Contacts. . . . . . . . . . . . . . . . . . . . . . 134

Precautions
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Introduction
Read these Safety Notes carefully before installing this unit.
These Safety Notes contain very important safety information. Always be sure to observe these
cautions.
After installation is complete, trial the operation of the unit to make sure that it is operating
normally. Instruct the customer about how to operate the unit, and about necessary
maintenance.
The dealer or a special contractor must install this unit.
Attempts to install this unit by a customer could result in leaks, electric shock, or fire.
Improper installation could result in leaks, electric shock, or fire.
If this unit is installed in a small room, measures must be taken to ensure that, even
in the event of a refrigerant leak, the maximum safe limit for refrigerant
concentration levels in the air is not exceeded.
Consult the dealer for details on what measures can be taken to keep from exceeding the
maximum safe limit. If a refrigerant leak does cause refrigerant concentration levels in the air
to exceed the maximum safe limit, asphyxiation could result.
Select a location for installation that will be able to safely bear the weight of the unit.
If the installation location is not strong enough to support the unit and the unit falls, injury
could result.
Install the unit in the prescribed manner to withstand strong (hurricane-level) winds
and earthquakes.
Insufficiently secure installation could allow the unit to tip over, fall, or otherwise cause an
accident.
Ventilate the area if any refrigerant leaks during installation.
If the refrigerant comes into contact with an open flame, it will produce a toxic gas.
After completing installation, make sure that no refrigerant is leaking.
If the refrigerant leaks indoors and comes into contact with an open flame in a water heater,
stove, oven, or other such appliance, it will produce a toxic gas.
Electrical work must be performed by a qualified electrician as described in the
Installation Manual.
The unit must be connected to its own independent circuit. Inadequate circuit capacity or
improper installation could result in electric shock or fire.
Wiring must be performed securely, using the prescribed cables.
The cables must be secured in a manner that prevents any force that pulls on the cables from
being relayed to the terminal connectors. If the cables are not connected or secured properly,
fire or other accidents could result.
The unit must be grounded.
Do not connect the ground wire to a gas pipe, water pipe, lightning rod, or telephone
ground wire. When wiring the system to the main power source, follow the standards
established by the local power company. Inadequate grounding can result in electric shock.
Do not install the unit in a location where combustible gases could conceivably leak.
Leaking gases that accumulate in the vicinity of the unit could be ignited by the unit.

Introduction
Components
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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
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
— — 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
— — — — — — — — — — — 8HP 8HP 8HP 8HP 10HP 8HP 8HP 8HP
— — — — — — — — — — — — — — — — 8HP 8HP 8HP
13 16 16 18 18 20 22 24 26 28 30 32 34 36 38 40 40 40 40
Min. HP Connected 4 5 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
Max. HP Connected 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
Combined
outdoor
units
No. of connectable
indoor units
Fixed-
speed unit
1. Outdoor Unit
2. Outdoor Units (Combination of Outdoor Units)
(*1). Code is determined according to the capacity code of the indoor units connected.
(*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.
NOTE: If the length of the gas pipe exceeds 30m from the 1st branching to an indoor unit,
increase the gas pipe size by 1 size, i.e. MM-U140 = Gas Ø22.2, Liquid Ø9.5
Model name Usage Appearance
RBM-Y018 Indoor unit capacity code (*1): Total below 6.4
Y-shape branching joint RBM-Y037 Indoor unit capacity code (*1): Total 6.4 or more and below 13.2 (*2)
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
(For connection of RBM-T129
outdoor unit)
Connecting pipe Corresponding dia. (mm). Qty
Balancing pipe Ø9.52 1
Piping at liquid side Ø12.7 to Ø22.2 1
Piping at gas side Ø22.2 to Ø54.1 1
3. Branching joints/headers

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Operating Conditions
Summary
The units referred to within this manual conform with the protection requirements of
Directives 89/336/EEC Electromagnetic Compatibility and 73/23/EEC Low voltage.
Operating conditions of the unit are as follows:
Outdoor temperature -5 ~ 43°C Cooling
-15 ~ 21°C Heating
Room Temperature 18 ~ 32°C Cooling
15 ~ 29°C Heating
Room humidity <80% Cooling
Note 1: Cooling capacity is rated at the following temperature conditions:
Indoor air inlet temperature 27°C DB, 19°C WB.
Outdoor air inlet temperature 35°C DB.
Note 2: Heating capacity is rated at the following temperature conditions:
Indoor air inlet temperature 20°C DB.
Outdoor air inlet temperature 7°C DB, 6°C WB.
Note 3: For details about the Outdoor unit, Indoor units or Remote Controller installation
refer to the relevant literature, i.e. Installation Instructions supplied with the units.
Note 4: Operatives handling refrigerants must be suitably qualified in accordance with local
and national codes of practice and statutory requirements.
Note 5: Legislation may regulate the removal of waste refrigerant from the systems. We advise
awareness of any regulations and duty of care. Waste refrigerant must NEVER be
discharged to atmosphere.
Note 6: Electrical work should be in accordance with all relevant codes of practice and should
be carried out by suitably qualified personnel.
Note 7: Metric/Imperial pipe conversion.
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Note 8: Within this manual:
ODU = Outdoor Unit IDU = Indoor Unit
R/C = Remote Controller D.O.L. = Direct On-Line compressor
INV = HP Inverter ODU FIX = HP Fixed Speed ODU
DB = Dry Bulb WB = Wet Bulb
Mg-Sw = Magnetic Contactor IOL = Inner Overload Relay
OCR = Over Current Relay IGBT = Inverter Gate Bi-Polar Transistor
Note 9: MPaG ⇒kgf/cm2G Conversion multiplier
10MPaG = 10.2kgf/cm2G
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) 1⁄43⁄81⁄25⁄83⁄47⁄811⁄813⁄815⁄821⁄8

Summary
Operating Conditions
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1. Model name
2. Range of combined units
No. of combined units : 1 to 5 units
Capacity range : Equivalent to 38.4kW type (14HP) to 128.8kW (46HP)
3. Restriction for combination units
(1) The Inverter Unit should have the maximum capacity among all units in
that combination.
(2) The 16.0kW (6HP) fixed-speed unit is available only with the combination of 38.4kW
(14HP) and 60.8kW (22HP). (It cannot be used for any other combination.)
4. 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:
T – Inverter
X – Fixed Speed
0280 – 28.0kW (10HP)
0224 – 22.4kW (8HP)
0160 – 16.0kW (6HP)
C – Cooling
H – Heating
MM–A0280HT
INDOOR
OUTDOOR
A – Outdoor
Modular Multi
028 – 2.8kW (1HP)
042 – 4.2kW (1.5HP)
056 – 5.6kW (2HP)
080 – 8.0kW (3HP)
112 – 11.2kW (4HP)
140 – 14.0kW (5HP)
MM–TU056
Modular Multi
B – Built-In Duct Type
C (CR)– Ceiling Type (IR Remote)
K (KR) – High Wall Type (IR Remote)
N – Carcase Type
S (SR) – Low Wall Type (IR Remote)
SB – Built-In Slim Duct Type
TU – 2 Way Cassette Type
U – 4 Way Cassette Type
ON
OFF ON OFF
Heat Priority (factory set) Cool Priority

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Outline of MMS (Modular Multi System)
• Non-polarized control wiring between
outdoor and indoor units
• Wiring diagnosis system
[Example of wiring diagnosis]
Use the switches on the microcomputer
PCB of the outdoor unit.
• Detects wiring to the indoor unit b4
which should not be in system A.
• b4 is missing in system B.
Outdoor unit
Indoor unit
Indoor unit
Piping
Wiring
System A
System B
Outdoor
unit
1st branching
section
Height difference between indoor unit and outdoor unit: 30m
Height difference between indoor unit and outdoor unit: 50m
From 1st branching to the
farthest indoor unit: 50m
Allowable pipe length :
100m real length
(Equivalent to 125m)
Outdoor
unit
Outdoor
unit
Compact design
The design of the Toshiba MMS outdoor unit allows for easy unit
maneuvering into any standard lift. Its size also allows it to be easily
installed in limited spaces.
Largest system capacity
Toshiba’s Multi Modular System can be combined up to 128.8kW
(46 HP).
Advanced bus communication system
Wiring between indoor and outdoor unit is a simple 2-wire system.
Communication address is also automatically configured.
A default test mode operation is available.
Self diagnostic system
Comprehensive troubleshooting code enables quick identification of
problems arising.
High lift design
Real pipe length of 100m (equivalent length 125m) and vertical lift of
50m is made possible with Toshiba’s Multi Modular System.
Vertical lift between indoor units of 30m is the highest in the market.
This allows for greater flexibility in the location of the system.
Multiple indoor units
Indoor units with different capacities and configurations can be
combined up to 135% of the outdoor unit capacity.
A maximum of 40 indoor units can be combined with the 46 HP
outdoor module.
Intelligent control
Toshiba’s MMS intelligent controls and modulating valves deliver the
required capacity, according to the load variation from 50% to 100%.
The intelligent controls and modulating valves limit or increase the
cooling/heating capacity dynamically so humidity and temperature
are kept in the comfort zone.
Outline of MMS (Modular Multi System)
Branching
Line Branching
Header Branching
Line + Header Branching
Line Branching after Header Branching
Combination of line and header branching is highly flexible. This allows
for the shortest design route possible, thereby saving on installation
time and cost. Line/header branching after header branching is only
available with Toshiba’s Multi Modular System.
Outdoor Unit
Outdoor Unit
Outdoor Unit
Outdoor Unit
Outdoor Unit
Indoor Unit
Indoor Unit
Indoor Unit
Indoor Unit
Indoor Unit
Branching joint
Branching joint
Branching joint
Branching
Header
Header
Header
Header
Header
MMS
Only
MMS
Only
8F
7F
2F
1F

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

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Parts Specifications
Outdoor Units
COMPRESSOR MODEL
MM-A0280HT MM-A0224HT MM-A0280HX MM-A0224HX MM-A0160HX
Model Name MG1450CW-21B YG1800CW-B1 YG1700CW-B1 YG890C-B1
Motor Type 3 – Phase induction motor
Power Supply 380 – 415V, 3 – Phase, 50Hz
Output (kΩ) 7.5 7.5 7.5 7.5 4.1
Pole (P) 2/2 (INV/Fixed) 2/2 (Fixed/Fixed) 2
Coil Resistance (W) 1.18/2.25 (INV/Fixed) 2.25/2.25 (Fixed/Fixed) 2.250
Comp. Oil Name NISSEKI RB68AF VG 74
Amount of Oil (ml) 7500 7500 7500 7500 2000
Inner Over-load Relay Opens: 115±5 °C Closes: 93±10°C
PARTS NAME SPECIFICATION
Model Name STF-200-350A
Motor Type 1-Phase induction motor
Fan Motor Power Supply AC 220-240V, 1 Phase, 50Hz
Output (W) 400
Current (A) 4.81~5.89
Pole (P) 6
High Pressure Switch Model Name INV=ACB-JB128 FIX=ACB-JA64
Operating Pressure (kgf/cm2G) Operation: 3.2, Reset 2.55
High Pressure Sensor Model Name 150NH4-H
Operating Conditions 0~3.33MPa
Low Pressure Sensor Model Name 150NH4-L
Operating Conditions 0~0.98MPa
Compressor Case Heater AC240V, 74W
Accumulator Case Heater AC240V, 29W
Discharge Temperature Sensor At 50ºC=18.1KΩ, At 100ºC=3.35KΩW,
Suction Temperature Sensor At 0ºC=34.6KΩ, At 25ºC=10.0KΩ, At 50ºC=3.4KΩ
Pulse Modulating Valve L12A-03, DC12V
Pulse Modulating Valve (For Cooling Bypass) A12A-15, DC12V
2-way Valve VPV-603D, Coil 240V
2-way Valve NEV-202D, Coil 240V
4-WAY VALVE MODEL
MM-A0280HT MM-A0224HT MM-A0280HX MM-A0224HX MM-A0160HX
Model Name CHV-0712 CHV-0712 CHV-0712 CHV-0712 CHV-0401
Coil Specification AC240V AC240V AC240V AC240V AC240V
MM-A0280HT, MM-A0224HT, MM-A0280HX, MM-A0224HX, MM-A0160HX