Toshiba MCY-MUG0401HSW-E User manual

AIR CONDITIONER (MULTI TYPE)
SERVICE MANUAL
Outdoor Unit
<MiNi-SMMS>
Model name:
<Heat Pump Model>
MCY-MUG0401HSW-E MCY-MUG0401HSW-TR
MCY-MUG0501HSW-E MCY-MUG0501HSW-TR
MCY-MUG0601HSW-E MCY-MUG0601HSW-TR
FILE No. AEO-2202W

1
Contents
1 Product summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
1-1. Outdoor unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
1-2. Connectable indoor units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
1-3. Branching joints and headers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
1-4. PMV kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
1-5. Shut-off Valve unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
1-6. Battery kit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
1-7. Leak Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2 Construction views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3 Wiring diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4 Parts rating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4-1. Outdoor unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4-2. Outdoor inverter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4-3. Shut-off value unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4-4. Battery kit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4-5. Leak Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4-6. Parts layout in outdoor unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4-7. Parts layout in inverter assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
4-8. Outdoor (inverter) print circuit board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
4-8-1. Interface P.C. board (MCC-1779) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
4-8-2. IPDU P.C. board (MCC-1690). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
4-8-3. Noise filter P.C. board (MCC-1706) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
4-9. Parts Layout in Shut-off Valve unit, Battery kit and Leak Detector . . . . . . . . . . . . . . . . . . . . . . 34
4-9-1. Parts Layout in Shut-off Valve unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4-9-2. Part layout in Battery kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4-9-3. Part layout in Leak Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4-10. Print circuit board of Shut-off Valve unit, Battery kit and Leak Detector. . . . . . . . . . . . . . . . . . 36
4-10-1. Shut-off Valve unit P.C. board (MCC-1771) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
4-10-2. Battery kit P.C. board (MCC-1772) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
4-10-3. Leak Detector P.C. board (MCC-1782) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5 Refrigerant piping systematic drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
6 Control outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
7 Applied control and functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
7-1. Method to Set Outdoor Unit Function Code No. (O.DN ). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
7-2. Applied Control of Outdoor Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
7-2-1. Outdoor Fan High Static Pressure Shift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
7-2-2. Priority Operation Mode Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Original instruction (English)

2
7-2-3. Applied control of outdoor unit by optional P.C. board . . . . . . . . . . . . . . . . . . . . . . . . 59
7-3. Notice Code. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
7-4. Night operation (Sound reduction control). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
8 Test operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
8-1. Procedure and summary of test operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
8-2. Check items before test operation
(before powering-on)76
8-3. Check at main power-on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
8-4. Address setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
8-4-1. Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
8-4-2. Address setup and check procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
8-4-3. Address setup procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
8-4-4. Check after address setup when central control system is connected . . . . . . . . . . . 103
8-4-5. Setting when connecting safety equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
8-5. Troubleshooting in test operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
8-5-1. A check code is displayed on the remote controller . . . . . . . . . . . . . . . . . . . . . . . . . 128
8-5-2. No Remote Controller Response with Check Code
(Operation from the indoor remote controller is not accepted, and a check code is
displayed on the 7- segment display of the interface PC board of the
Outdoor unit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
8-5-3. No Remote Controller Response without Check Code
(There is no display of a check code on the 7-segment display on the interface PC board
of the Outdoor unit, although there is indoor unit that is not accepting operation from the
indoor remote controller) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
8-5-4. Connected Indoor/Outdoor Unit Quantity Check
In checking the number of connected outdoor units and connected indoor units after
address setup, a lower number of connected units is displayed. (There are outdoor /
indoor units that do not operate in a test operation.). . . . . . . . . . . . . . . . . . . . . . . . . 131
8-6. Test operation check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
8-6-1. Fan check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
8-6-2. Inspection mode (safety measures) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
8-6-3. Cooling / Heating test operation check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
8-6-4. Pump-down test operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
8-7. Service support function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
8-7-1. Check function for connecting of refrigerant and control lines . . . . . . . . . . . . . . . . . 140
8-7-2. Function to start / stop (ON / OFF) indoor unit from outdoor unit . . . . . . . . . . . . . . . 142
8-7-3. Check Code Clearing Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
8-7-4. Remote controller distinction function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
8-7-5. Pulse Motor Valve (PMV) Forced Open/Close Function in Indoor Unit. . . . . . . . . . . 152
8-7-6. Pulse Motor Valve (PMV) Forced Open/Close Function and Solenoid valve Forced ON/
OFF Function in Outdoor Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
8-7-7. Pulse motor valve (PMV) forced open / close function in Shut-off Valve unit. . . . . . 155
8-7-8. Fan operation check in outdoor unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
8-7-9. Manual adjustment function of outside temperature (TO) sensor . . . . . . . . . . . . . . . 157

3
8-7-10. Confirmation of the check code ( L02, L11, L13, L14 ) occurred during installation . 158
8-7-11. Confirmation of the number of Shut-off Valve units connected . . . . . . . . . . . . . . . . . 158
8-7-12. Monitor function of remote controller switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
9 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
9-1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
9-2. Troubleshooting method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
9-3. Troubleshooting based on information displayed on remote controller . . . . . . . . . . . . . . . . . . 168
9-4. Check codes displayed on remote controller and outdoor unit (7-segment display on I/F board)
and locations to be checked . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172
9-5. Diagnosis procedure for each check code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184
9-6. 7-segment display function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213
9-7. Sensor characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218
9-8. Pressure sensor output check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221
9-9. System operation when the Leak Detector detects a refrigerant leak. . . . . . . . . . . . . . . . . . . 223
10 Outdoor unit parts replacement methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224
11 P.C. board exchange procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237
11-1. Interface P.C. board Replacement Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237
11-2. IPDU P.C.board Replacement Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239
11-3. Noise filter P.C.board Replacement Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241
11-4. Shut-off Valve unit including Battery kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242
11-5. Disposal method for Battery kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249
11-6. Leak Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250
12 Exploded diagram / parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252
12-1. Outdoor unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252
12-2. Inverter assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 254
12-3. Shut-off Valve unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255
12-4. Leak Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 256

4
This service manual provides relevant explanations about new outdoor unit.
Please refer to the following service manuals for each indoor units.
Model name SVM File No.
<4-Way Cassette Type>
MMU-UP***1HP-E/-TR (Made in Thailand model)
MMU-UP***1H-E/-TR (Made in Japan model)
SVM-20095
A10-2004
<Compact 4-Way Cassette Type>
MMU-UP***1MH-E/-TR (Made in Japan model) A10-2004
<2-Way Cassette Type>
MMU-UP***1WH-E/-TR (Made in Japan model) A10-2004
<1-Way Cassette Type>
MMU-UP***1SH-E/-TR (Made in Japan model)
MMU-UP***1YHP-E/-TR (Made in Thailand model)
A10-2004
SVM-20107
<Concealed Duct Standard Type>
MMD-UP***1BHP-E/-TR (Made in Thailand model) SVM-20095
<Concealed Duct High Static Pressure Type>
MMD-UP***1HP-E/-TR (Made in Thailand model) SVM-20095
<Slim Duct Type>
MMD-UP***1SPHY-E (Made in China model) A10-2006
<Under Ceiling Type>
MMC-UP***1HP-E/-TR (Made in Thailand model) SVM-20095
<High Wall Type>
MMK-UP***1HP-E/-TR (Made in Thailand model)
MMK-UP***1HPL-E (Made in Thailand model)
SVM-20095
SVM-20095

5
SAFETY CAUTION
Please read carefully through these instructions that contain important information which complies with the
"Machinery Directive" (Directive 2006/42/EC), and ensure that you understand them.
Generic Denomination: Air Conditioner
Definition of Qualified Installer or Qualified Service Person
The air conditioner must be installed, maintained, repaired and removed by a qualified installer or qualified service
person. When any of these jobs is to be done, ask a qualified installer or qualified service person to do them.
A qualified installer or qualified service person is an agent who has the qualifications and knowledge described in
the table below.
Agent Qualifications and knowledge which the agent must have
Qualified installer
(*1)
• The qualified installer is a person who installs, maintains, relocates and removes the air
conditioners made by Toshiba Carrier Corporation. He or she has been trained to install,
maintain, relocate and remove the air conditioners made by Toshiba Carrier Corporation or,
alternatively, he or she has been instructed in such operations by an individual or individuals who
have been trained and is thus thoroughly acquainted with the knowledge related to these
operations.
• The qualified installer who is allowed to do the electrical work involved in installation, relocation
and removal has the qualifications pertaining to this electrical work as stipulated by the local laws
and regulations, and he or she is a person who has been trained in matters relating to electrical
work on the air conditioners made by Toshiba Carrier Corporation or, alternatively, he or she has
been instructed in such matters by an individual or individuals who have been trained and is thus
thoroughly acquainted with the knowledge related to this work.
• The qualified installer who is allowed to do the refrigerant handling and piping work involved in
installation, relocation and removal has the qualifications pertaining to this refrigerant handling
and piping work as stipulated by the local laws and regulations, and he or she is a person who
has been trained in matters relating to refrigerant handling and piping work on the air conditioners
made by Toshiba Carrier Corporation or, alternatively, he or she has been instructed in such
matters by an individual or individuals who have been trained and is thus thoroughly acquainted
with the knowledge related to this work.
• The qualified installer who is allowed to work at heights has been trained in matters relating to
working at heights with the air conditioners made by Toshiba Carrier Corporation or, alternatively,
he or she has been instructed in such matters by an individual or individuals who have been
trained and is thus thoroughly acquainted with the knowledge related to this work.
Qualified service
person (*1)
• The qualified service person is a person who installs, repairs, maintains, relocates and removes
the air conditioners made by Toshiba Carrier Corporation. He or she has been trained to install,
repair, maintain, relocate and remove the air conditioners made by Toshiba Carrier Corporation
or, alternatively, he or she has been instructed in such operations by an individual or individuals
who have been trained and is thus thoroughly acquainted with the knowledge related to these
operations.
• The qualified service person who is allowed to do the electrical work involved in installation,
repair, relocation and removal has the qualifications pertaining to this electrical work as stipulated
by the local laws and regulations, and he or she is a person who has been trained in matters
relating to electrical work on the air conditioners made by Toshiba Carrier Corporation or,
alternatively, he or she has been instructed in such matters by an individual or individuals who
have been trained and is thus thoroughly acquainted with the knowledge related to this work.
• The qualified service person who is allowed to do the refrigerant handling and piping work
involved in installation, repair, relocation and removal has the qualifications pertaining to this
refrigerant handling and piping work as stipulated by the local laws and regulations, and he or
she is a person who has been trained in matters relating to refrigerant handling and piping work
on the air conditioners made by Toshiba Carrier Corporation or, alternatively, he or she has been
instructed in such matters by an individual or individuals who have been trained and is thus
thoroughly acquainted with the knowledge related to this work.
• The qualified service person who is allowed to work at heights has been trained in matters
relating to working at heights with the air conditioners made by Toshiba Carrier Corporation or,
alternatively, he or she has been instructed in such matters by an individual or individuals who
have been trained and is thus thoroughly acquainted with the knowledge related to this work.

6
Definition of Protective Gear
When the air conditioner is to be transported, installed, maintained, repaired or removed, wear protective gloves
and ‘safety’ work clothing. In addition to such normal protective gear, wear the protective gear described below
when undertaking the special work detailed in the table below. Failure to wear the proper protective gear is
dangerous because you will be more susceptible to injury, burns, electric shocks and other injuries.
The important contents concerned to the safety are described on the product itself and on this Service Manual.
Please read this Service Manual after understanding the described items thoroughly in the following contents
(Indications / Illustrated marks), and keep them.
[Explanation of indications]
* Property damage: Enlarged damage concerned to property, furniture, and domestic animal / pet
[Explanation of illustrated marks]
Work undertaken Protective gear worn
All types of work Protective gloves
‘Safety’ working clothing
Electrical-related work Gloves to provide protection for electricians Insulating shoes
Clothing to provide protection from electric shock
Work done at heights
(50 cm or more) Helmets for use in industry
Transportation of heavy objects Shoes with additional protective toe cap
Repair of outdoor unit Gloves to provide protection for electricians
Indication Explanation
DANGER Indicates contents assumed that an imminent danger causing a death or serious injury of
the repair engineers and the third parties when an incorrect work has been executed.
WARNING Indicates possibilities assumed that a danger causing a death or serious injury of the
repair engineers, the third parties, and the users due to troubles of the product after work
when an incorrect work has been executed.
CAUTION Indicates contents assumed that an injury or property damage (*) may be caused on the
repair engineers, the third parties, and the users due to troubles of the product after work
when an incorrect work has been executed.
Mark Explanation
Indicates prohibited items (Forbidden items to do)
The sentences near an illustrated mark describe the concrete prohibited contents.
Indicates mandatory items (Compulsory items to do)
The sentences near an illustrated mark describe the concrete mandatory contents.
Indicates cautions (Including danger / warning)
The sentences or illustration near or in an illustrated mark describe the concrete cautious contents.

7
Warning indications on the air conditioner unit
Warning indication Description
WARNING
ELECTRICAL SHOCK HAZARD
Disconnect all remote electric power supplies before servicing.
WARNING
Moving parts.
Do not operate unit with grille removed.
Stop the unit before the servicing.
CAUTION
High temperature parts.
You might get burned when removing this panel.
CAUTION
Do not touch the aluminium fins of the unit.
Doing so may result in injury.
CAUTION
Do not touch the aluminum fins of the unit.
You might get burned.
CAUTION
BURST HAZARD
Open the service valves before the operation, otherwise there might be the
burst.
WARNING
(Risk of fire)
Read the OWNER’S MANUAL carefully before operation.
Service personnel are required to carefully read the OWNER’S MANUAL and INSTALLATION MANUAL
before operation.
Further information is available in the OWNER’S MANUAL, INSTALLATION MANUAL, and the like.
CAUTION
Do not touch the
aluminum fins of
the unit. You might get
burned.

8
Precautions for safety
The manufacturer shall not assume any liability for the damage caused by not observing the description of this
manual.
DANGER
(*1) Refer to the “Definition of Qualified Installer or Qualified Service Person”
Turn off
breaker.
Before carrying out the installation, maintenance, repair or removal work, be sure to set the circuit breaker for
both the indoor and outdoor units to the OFF position. Otherwise, electric shocks may result.
Before opening the intake grille of the indoor unit or service panel of the outdoor unit, set the circuit breaker to
the OFF position. Failure to set the circuit breaker to the OFF position may result in electric shocks through
contact with the interior parts. Only a qualified installer (*1) or qualified service person (*1) is allowed to remove
the intake grille of the indoor unit or service panel of the outdoor unit and do the work required.
Before opening the electric box cover set the circuit breaker to the OFF position.
Failure to set the circuit breaker to the OFF position may result in injury through contact with the rotation parts.
Only a qualified installer (*1) or qualified service person (*1) is allowed to remove the electric box cover and do
the work required.
Before starting to repair the outdoor unit fan or fan guard, be absolutely sure to set the circuit breaker to the
OFF position, and place a “Work in progress” sign on the circuit breaker.
When cleaning the filter or other parts of the indoor unit, set the circuit breaker to OFF without fail, and place a
“Work in progress” sign near the circuit breaker before proceeding with the work.
When you have noticed that some kind of trouble (such as when an error display has appeared, there is a smell
of burning, abnormal sounds are heard, the air conditioner fails to cool or heat or water is leaking) has occurred
in the air conditioner, do not touch the air conditioner yourself but set the circuit breaker to the OFF position,
and contact a qualified service person. Take steps to ensure that the power will not be turned on (by marking
“out of service” near the circuit breaker, for instance) until qualified service person arrives. Continuing to use the
air conditioner in the trouble status may cause mechanical problems to escalate or result in electric shocks or
other failure.
Electric shock
hazard
When you access inside of the service panel to repair electric parts, wait for about five minutes after turning off
the breaker. Do not start repairing immediately.Otherwise you may get electric shock by touching terminals of
high-voltage capacitors. Natural discharge of the capacitor takes about five minutes.
When checking the electric parts, removing the cover of the electric parts box of indoor unit and/or service panel
of outdoor unit inevitably to determine the failure, use gloves to provide protection for electricians, insulating
shoes, clothing to provide protection from electric shock and insulating tools. Be careful not to touch the live
part. Electric shock may result. Only “Qualified service person” is allowed to do this work.
Prohibition
Place a “Work in progress” sign near the circuit breaker while the installation, maintenance, repair or removal
work is being carried out.
There is a danger of electric shocks if the circuit breaker is set to ON by mistake.
When checking the electric parts, removing the cover of the electric parts box of Indoor Unit and/or front panel
of outdoor unit inevitably to determine the failure, put a sign “Do not enter” around the site before the work.
Failure to do this may result in third person getting electric shock.
Before operating the air conditioner after having completed the work, check that the electrical parts box cover
of the indoor unit and service panel of the outdoor unit are closed, and set the circuit breaker to the ON position.
You may receive an electric shock if the power is turned on without first conducting these checks.
Stay on
protection
If, in the course of carrying out repairs, it becomes absolutely necessary to check out the electrical parts with
the electrical parts box cover of one or more of the indoor units and the service panel of the outdoor unit
removed in order to find out exactly where the trouble lies, wear insulated heat-resistant gloves, insulated boots
and insulated work overalls, and take care to avoid touching any live parts. You may receive an electric shock
if you fail to heed this warning. Only qualified service person (*1) is allowed to do this kind of work..

9
WARNING
General
Before starting to repair the air conditioner, read carefully through the Service Manual, and repair the air
conditioner by following its instructions.
Only qualified service person (*1) is allowed to repair the air conditioner.
Repair of the air conditioner by unqualified person may give rise to a fire, electric shocks, injury, water leaks
and / or other problems.
Do not use any refrigerant different from the one specified for complement or replacement.
Otherwise, abnormally high pressure may be generated in the refrigeration cycle, which may result in a failure
or explosion of the product or an injury to your body.
Only a qualified installer (*1) or qualified service person (*1) is allowed to carry out the electrical work of the air
conditioner.
Under no circumstances must this work be done by an unqualified individual since failure to carry out the work
properly may result in electric shocks and / or electrical leaks.
When the air conditioner is to be transported, installed, maintained, repaired or removed, wear protective gloves
and ‘safety’ work clothing.
To connect the electrical wires, repair the electrical parts or undertake other electrical jobs, wear gloves to
provide protection for electricians, insulating shoes and clothing to provide protection from electric shocks.
Failure to wear this protective gear may result in electric shocks.
Electrical wiring work shall be conducted according to law and regulation in the community and Installation
Manual. Failure to do so may result in electrocution or short circuit.
Use wiring that meets the specifications in the Installation Manual and the stipulations in the local regulations
and laws. Use of wiring which does not meet the specifications may give rise to electric shocks, electrical
leakage, smoking and/or a fire.
Only a qualified installer (*1) or qualified service person (*1) is allowed to undertake work at heights using
a stand of 50 cm or more or to remove the intake grille of the indoor unit to undertake work.
When working at heights, use a ladder which complies with the ISO 14122 standard, and follow the procedure
in the ladder’s instructions.
Also wear a helmet for use in industry as protective gear to undertake the work.
Before working at heights, put a sign in place so that no-one will approach the work location, before proceeding
with the work. Parts and other objects may fall from above, possibly injuring a person below. While carrying out
the work, wear a helmet for protection from falling objects.
When executing address setting, test run, or troubleshooting through the checking window on the electric parts
box, put on insulated gloves to provide protection from electric shock. Otherwise you may receive an electric
shock.
Do not touch the aluminum fin of the unit.
You may injure yourself if you do so. If the fin must be touched for some reason, first put on protective gloves
and safety work clothing, and then proceed.
Do not climb onto or place objects on top of the outdoor unit.
You may fall or the objects may fall off the outdoor unit and result in injury.
Use forklift truck to carry in the air conditioner units and use winch or hoist at installation of them
When transporting the air conditioner, wear shoes with additional protective toe caps.
When transporting the air conditioner, do not take hold of the bands around the packing carton.
You may injure yourself if the bands should break.
Be sure that a heavy unit (10 kg or heavier) such as a compressor is carried by two persons.
Check earth
wires.
Before troubleshooting or repair work, check the earth wire is connected to the earth terminals of the main unit,
otherwise an electric shock is caused when a leak occurs. If the earth wire is not correctly connected, contact
an electric engineer for rework.
After completing the repair or relocation work, check that the earth wires are connected properly.
Connect earth wire. (Grounding work) Incomplete earthing causes an electric shock.
Do not connect earth wires to gas pipes, water pipes, and lightning rods or earth wires for telephone wires.
(*1) Refer to the “Definition of Qualified Installer or Qualified Service Person”

10
Prohibition of
modification.
Do not modify the products.Do not also disassemble or modify the parts.
It may cause a fire, electric shock or injury.
Use specified
parts.
When any of the electrical parts are to be replaced, ensure that the replacement parts satisfy the specifications
given in the Service Manual (or use the parts contained on the parts list in the Service Manual).
Use of any parts which do not satisfy the required specifications may give rise to electric shocks, smoking and /
or a fire.
Do not bring a
child close to
the
equipment.
If, in the course of carrying out repairs, it becomes absolutely necessary to check out the electrical parts with
the electrical parts box cover of one or more of the indoor units and the service panel of the outdoor unit
removed in order to find out exactly where the trouble lies, put a sign in place so that noone will approach the
work location before proceeding with the work. Third-party individuals may enter the work site and receive
electric shocks if this warning is not heeded.
Insulating
measures
Connect the cut-off lead wires with crimp contact, etc., put the closed end side upward and then apply a water
cut method, otherwise a leak or production of fire is caused at the users’ side.
No fire
When performing repairs using a gas burner, replace the refrigerant with nitrogen gas because the oil that coats
the pipes may otherwise burn.
When repairing the refrigerating cycle, take the following measures.
1) Be attentive to fire around the cycle. When using a gas stove, etc., be sure to put out fire before work;
otherwise the oil mixed with refrigerant gas may catch fire.
2) Do not use a brazing in the closed room. When using it without ventilation, carbon monoxide poisoning may
be caused.
3) Do not bring inflammables close to the refrigerant cycle, otherwise fire of the brazing may catch the
inflammables.
Refrigerant
The refrigerant used by this air conditioner is the R32.
Check the used refrigerant name and use tools and materials of the parts which match with it.
For the products which use R32 refrigerant, the refrigerant name is indicated at a position on the outdoor unit
where is easy to see. To prevent miss charging, the route of the service port is changed from one of the
former R22.
Do not use any refrigerant different from the one specified for complement or replacement.
Otherwise, abnormally high pressure may be generated in the refrigeration cycle, which may result in a failure
or explosion of the product or an injury to your body.
For an air conditioner which uses R32, never use other refrigerant than R32. For an air conditioner which uses
other refrigerant (R22, etc.), never use R32.
If different types of refrigerant are mixed, abnormal high pressure generates in the refrigerating cycle and an
injury due to breakage may be caused.
When the air conditioner has been installed or relocated, follow the instructions in the Installation
Manual and purge the air completely so that no gases other than the refrigerant will be mixed in the
refrigerating cycle.
Failure to purge the air completely may cause the air conditioner to malfunction.
Do not charge refrigerant additionally. If charging refrigerant additionally when refrigerant gas leaks, the
refrigerant composition in the refrigerating cycle changes resulted in change of air conditioner characteristics or
refrigerant over the specified standard amount is charged and an abnormal high pressure is applied to the inside
of the refrigerating cycle resulted in cause of breakage or injury.
Therefore if the refrigerant gas leaks, recover the refrigerant in the air conditioner, execute vacuuming, and then
newly recharge the specified amount of liquid refrigerant.
In this time, never charge the refrigerant over the specified amount.
When recharging the refrigerant in the refrigerating cycle, do not mix the refrigerant or air other than R410A into
the specified refrigerant. If air or others is mixed with the refrigerant, abnormal high pressure generates in the
refrigerating cycle resulted in cause of injury due to breakage.
After installation work, check the refrigerant gas does not leak. If the refrigerant gas leaks in the room,
poisonous gas generates when gas touches to fire such as fan heater, stove or cooking stove though the
refrigerant gas itself is innocuous.
Never recover the refrigerant into the outdoor unit. When the equipment is moved or repaired, be sure to recover
the refrigerant with recovering device.
The refrigerant cannot be recovered in the outdoor unit; otherwise a serious accident such as breakage or injury
is caused.

11
Assembly /
Wiring
After repair work, surely assemble the disassembled parts, and connect and lead the removed wires as before.
Perform the work so that the cabinet or panel does not catch the inner wires.
If incorrect assembly or incorrect wire connection was done, a disaster such as a leak or fire is caused at user’s
side.
Insulator
check
After the work has finished, be sure to use an insulation tester set (500VMΩ) to check the resistance is 1 MΩor
more between the charge section and the non-charge metal section (Earth position).
If the resistance value is low, a disaster such as a leak or electric shock is caused at user’s side.
Ventilation
When the refrigerant gas leaks during work, execute ventilation.
If the refrigerant gas touches to a fire, poisonous gas generates. A case of leakage of the refrigerant and the
closed room full with gas is dangerous because a shortage of oxygen occurs. Be sure to execute ventilation.
If refrigerant gas has leaked during the installation work, ventilate the room immediately.
If the leaked refrigerant gas comes in contact with fire, noxious gas may generate.
After installation work, check the refrigerant gas does not leak. If the refrigerant gas leaks in the room,
poisonous gas generates when gas touches to fire such as fan heater, stove or cooking stove though the
refrigerant gas itself is innocuous.
Compulsion
When the refrigerant gas leaks, find out the leaked position and repair it surely.
If the leaked position cannot be found out and the repair work is interrupted, reclaim and tighten the service
valve, otherwise the refrigerant gas may leak into the room.
The poisonous gas generates when gas touches to fire such as fan heater, stove or cooking stove though the
refrigerant gas itself is innocuous.
When installing equipment which includes a large amount of charged refrigerant in a sub-room, it is necessary
that the concentration does not the limit even if the refrigerant leaks.
If the refrigerant leaks and exceeds the limit concentration, an accident of shortage of oxygen is caused.
Tighten the flare nut with a torque wrench in the specified manner.
Excessive tighten of the flare nut may cause a crack in the flare nut after a long period, which may result in
refrigerant leakage.
Nitrogen gas must be used for the airtight test.
The charge hose must be connected in such a way that it is not slack.
For the installation / moving / reinstallation work, follow to the Installation Manual.
If an incorrect installation is done, a trouble of the refrigerating cycle, water leak, electric shock or fire is caused.
Check after
repair
Once the repair work has been completed, check for refrigerant leaks, and check the insulation resistance and
water drainage.
Then perform a trial run to check that the air conditioner is running properly.
After repair work has finished, check there is no trouble. If check is not executed, a fire, electric shock or injury
may be caused. For a check, turn off the power breaker.
After repair work (installation of front panel and cabinet) has finished, execute a test run to check there is no
generation of smoke or abnormal sound.
If check is not executed, a fire or an electric shock is caused. Before test run, install the front panel and cabinet.
Be sure to fix the screws back which have been removed for installation or other purposes.
Do not
operate the
unit with the
valve closed.
Check the following matters before a test run after repairing piping.
• Connect the pipes surely and there is no leak of refrigerant.
• The valve is opened.
Running the compressor under condition that the valve closes causes an abnormal high pressure
resulted in damage of the parts of the compressor and etc. and moreover if there is leak of refrigerant
at connecting section of pipes, the air is sucked and causes further abnormal high pressure resulted in
burst or injury.
Check after
reinstallation
Only a qualified installer (*1) or qualified service person (*1) is allowed to relocate the air conditioner. It is
dangerous for the air conditioner to be relocated by an unqualified individual since a fire, electric shocks, injury,
water leakage, noise and / or vibration may result.
Check the following items after reinstallation.
1) The earth wire is correctly connected.
2) The power cord is not caught in the product.
3) There is no inclination or unsteadiness and the installation is stable.
If check is not executed, a fire, an electric shock or an injury is caused.
When carrying out the reclaim work shut down the compressor before disconnecting the refrigerant pipe.
Disconnecting the refrigerant pipe with the service valve left open and the compressor still operating will cause
air, etc. to be sucked in, raising the pressure inside the refrigeration cycle to an abnormally high level, and
possibly resulting in rupture, injury, etc.
(*1) Refer to the “Definition of Qualified Installer or Qualified Service Person”

12
Explanations given to user
If you have discovered that the fan grille is damaged, do not approach the outdoor unit but set the circuit breaker
to the OFF position, and contact a qualified service person to have the repairs done.
Do not set the circuit breaker to the ON position until the repairs are completed.
Relocation
• Only a qualified installer or qualified service person is allowed to relocate the air conditioner.
It is dangerous for the air conditioner to be relocated by an unqualified individual since a fire, electric shocks,
injury, water leakage, noise and/or vibration may result.
• When carrying out the pump-down work shut down the compressor before disconnecting the refrigerant pipe.
Disconnecting the refrigerant pipe with the service valve left open and the compressor still operating will cause
air, etc. to be sucked in, raising the pressure inside the refrigeration cycle to an abnormally high level, and
possibly resulting in reputing, injury, etc.
(*1) Refer to the “Definition of Qualified Installer or Qualified Service Person”
Cooling check
When the service panel of the outdoor unit is to be opened in order for the compressor or the area around this
part to be repaired immediately after the air conditioner has been shut down, set the circuit breaker to the OFF
position, and then wait at least 10 minutes before opening the service panel. If you fail to heed this warning, you
will run the risk of burning yourself because the compressor pipes and other parts will be very hot to the touch.
In addition, before proceeding with the repair work, wear the kind of insulated heat-resistant gloves designed to
protect electricians.
Take care not to get burned by compressor pipes or other parts when checking the cooling cycle while running
the unit as they get heated while running. Be sure to put on gloves providing protection for heat.
When the service panel of the outdoor unit is to be opened in order for the fan motor, inverter or the areas
around these parts to be repaired immediately after the air conditioner has been shut down, set the circuit
breaker to the OFF position, and then wait at least 10 minutes before opening the service panel.
If you fail to heed this warning, you will run the risk of burning yourself because the fan motor, reactor, inverter
heat sink and other parts will be very hot to the touch.
In addition, before proceeding with the repair work, wear the kind of insulated heat-resistant gloves designed to
protect electricians.
Installation
Only a qualified installer or service person is allowed to do installation work. Inappropriate installation may result
in water leakage, electric shock or fire.
Before starting to install the air conditioner, read carefully through the Installation Manual, and follow its
instructions to install the air conditioner.
Be sure to use the company-specified products for the separately purchased parts. Use of nonspecified
products may result in fire, electric shock, water leakage or other failure. Have the installation performed by
a qualified installer.
Do not supply power from the power terminal block equipped on the outdoor unit to another outdoor unit.
Capacity overflow may occur on the terminal block and may result in fire.
Do not install the air conditioner in a location that may be subject to a risk of expire to a combustible gas.
If a combustible gas leaks and becomes concentrated around the unit, a fire may occur.
Install the indoor unit at least 2.5 m above the floor level since otherwise the users may injure themselves or
receive electric shocks if they poke their fingers or other objects into the indoor unit while the air conditioner
is running.
Install a circuit breaker that meets the specifications in the Installation Manual and the stipulations in the local
regulations and laws.
Install the circuit breaker where it can be easily accessed by the agent.
If you install the unit in a small room, take appropriate measures to prevent the refrigerant from exceeding the
limit concentration even if it leaks. Consult the dealer from whom you purchased the air conditioner when you
implement the measures. Accumulation of highly concentrated refrigerant may cause an oxygen deficiency
accident.
Do not place any combustion appliance in a place where it is directly exposed to the wind of air conditioner,
otherwise it may cause imperfect combustion.

13
Declaration of Conformity
NOTE
• This declaration becomes invalid if technical or operational modifi cations are introduced without the
manufacturer’s consent.
Disposal
How to dispose of air conditioners in accordance with the 2002/96/EC Directive WEEE (Waste Electrical and
Electronic Equipment) is provided in the manual supplied with your product.
Specifications
Manufacturer: Toshiba Carrier Air-Conditioning Europe Sp.z o.o.
ul. Gdańska 131, 62-200 Gniezno, Poland
TCF holder: Toshiba Carrier Air-Conditioning Europe Sp.z o.o.
ul. Gdańska 131, 62-200 Gniezno, Poland
Hereby declares that the machinery described below:
Generic Denomination: Air Conditioner
Model / type: MCY-MUG0401HSW-E, MCY-MUG0501HSW-E, MCY-MUG0601HSW-E
MCY-MUG0401HSW-TR, MCY-MUG0501HSW-TR, MCY-MUG0601HSW-TR
Commercial name: Mini-Super Modular Multi System Air Conditioner (MiNi-SMMS series)
Complies with the provisions of the Machinery Directive (Directive 2006/42/EC) and the regulations
transposing into national law
Complies with the provisions of the following harmonized standard: EN 378-2: 2016
Name: Hori Masato
Position: GM, Quality Assurance & Design Engineering Dept.
Date: 14 November, 2022
Place Issued: Poland
Model type
Sound power level (dBA)
Weight (kg)
Cooling Heating
MCY-MUG0401HSW-E
69 71 100
MCY-MUG0401HSW-TR
MCY-MUG0501HSW-E
70 72 100
MCY-MUG0501HSW-TR
MCY-MUG0601HSW-E
71 73 100
MCY-MUG0601HSW-TR

14
About refrigerant R32
This air conditioner adopts a new HFC type refrigerant (R32) which does not deplete the ozone layer.
1. Safety Caution Concerned to Refrigerant R32
Be sure that water, dust, the former refrigerant or the former refrigerating oil is not mixed into the refrigerating
cycle of the air conditioner with refrigerant R32 during installation work or service work. If an incorrect work or
incorrect service is performed, there is a possibility to cause a serious accident. Use the tools and materials
exclusive to R32 to purpose a safe work.
2. Safety and Cautions on Installation/Service
<Safety items>
When gas concentration and ignition energy are happened at the same time, R32 has a slight possibility of
burning. Although it will not ignite under normal work environment conditions, be aware that the flame spreads
if ignition should occur.
It is necessary to carry out installation/servicing safely while taking the following precautions into consideration.
1 Never use refrigerant other than specified refrigerant (R32) in an air conditioner which is designed to operate
with the specified refrigerant (R32).
If other refrigerant than R32 is used, it may cause personal injury, etc. due to a malfunction, a fire, or rupture.
2 Since R32 is heavier than air, it tends to accumulate on the bottom (near the floor).
Ventilate properly for the working environment to prevent its combustion.
Especially in a basement or a closed room where there is a high risk of the accumulation, ventilate the room
with a local exhaust ventilator.
If refrigerant leakage is confirmed in the room or the place where the ventilation is insufficient, do not work
until the proper ventilation is performed and the work environment is improved.
3 When performing brazing work, be sure to check for leakage refrigerant or residual refrigerant. If the leakage
refrigerant comes into contact with fire, a poisonous gas may occur, causing a fire. Keep adequate ventilation
during the work.
4 When refrigerant gas leaks during work, execute ventilation. If the leakage refrigerant comes into contact with
a fire, a poisonous gas may occur, causing a fire.
5 In places where installing / repairing air-conditioning equipment, etc., keep the source of ignition such as gas
combustion equipment, petroleum combustion equipment, electric heater etc. away. Do not smoke in the
place.
6 When installing or removing an air conditioner, do not mix air in the refrigerant cycle.
If air or others is mixed with the refrigerant, abnormal high pressure occurs in the refrigerating cycle, causing
injury due to the breakage.
7 After installation work has been completed, confirm that refrigerant gas is not leaking on the flare connection
part or others. If leaked refrigerant comes to contact with a fire, toxic gas may occur, causing a fire.
8 Perform the installation work and re-installation according to the installation manual.
Pay attention especially to the area of application. Improper installation may cause refrigeration trouble,
water leakage, electric shock, or fire etc.
9 Unauthorized modifications to the air conditioner may be dangerous. If a breakdown occurs, please call
a qualified air conditioner technician or electrician.
Improper repair may result in water leakage, electric shock and fire, etc.
10 Carry out the airtight test with nitrogen at a specified pressure. Do not use oxygen or acetylene gas
absolutely as it may cause an explosion.
11 Always carry a refrigerant leakage detection sensor during the work and work while checking that no
refrigerant leaks around working environment.
12 If the leakage refrigerant comes into contact with fire, it may cause a fire.
Have a dry powder or CO2 fire extinguisher adjacent to the charging area.
<Caution items>
1 The opposite side dimension of the air-conditioner’s flared nut using R32 and the shape of the charge port
are the same as those of R410A.
2 Be careful not to charge refrigerant by mistake. Should the different type of refrigerant be mixed, be sure to
recharge the refrigerant.
3 Do not mix the other refrigerant or refrigerating oil with the refrigerant.

15
4 Since the pressure of R32 is 1.6 times higher than that of the former refrigerant (R22), use tools and parts
for high pressure resistance specification similar to R410A.
5 In the installation time, use clean pipe materials and work with great attention so that water and others do not
mix in because pipes are affected by impurities such as water, oxide film, oil, etc. Use the clean pipes.
Be sure to braze while flowing nitrogen gas in the pipe. (Never use gas other than nitrogen gas.)
6 For the earth protection, use a vacuum pump for air purge.
7 R32 refrigerant is Single-component refrigerant that does not change its composition.
Although it is possible to charge the refrigerant with either liquid or gas, charge it with liquid.
3. Pipe Materials
For the refrigerant pipes, copper pipe and joints are mainly used.
It is necessary to select the most appropriate pipes to conform to the standard.
Use clean pipes or joints to which little impurities adhere.
1) Copper pipe
Be sure to select the pipes with copper thickness in the table below since the pressure of an air conditioner
using R32 is higher than that of R22.
2) Joint
The flare joint and socket joint are used for joints of the copper pipe.
The joints are rarely used for installation of the air conditioner.
However clear impurities when using them.
Nominal
diameter
Outer
diameter (mm)
Thickness (mm)
R410A or R32
Make sure not to use a thin copper pipe such
as 0.7 mm copper thickness in the market.
1/2 6.4 0.80
3/8 9.5 0.80
1/2 12.7 0.80
5/8 15.9 1.00
<Piping>
The pipe thickness, flare-finishing size, flare nut and others differ according to a refrigerant type.
When using a long copper pipe for R32, it is recommended to select “Copper or copper-base pipe without seam”
and one with bonded oil amount 40mg/10m or less.
Also do not use crushed, deformed, discolored (especially inside) pipes.
(Impurities cause clogging of expansion valves and capillary tubes.)
<Flare nut>
Use the flare nuts which are attached to the air conditioner unit.

16
4. Tools
: R410A tools available
: Partly unavailable, : R410A tools unavailable
Note 1 When flaring is carried out for R410A or R32 using the conventional flare tools, adjustment of projection
margin is necessary. For this adjustment, a copper pipe gauge, etc. is necessary.
Note 2 When saturation temperature is described, the gauge manifold differs for R410A and R32. If saturation
temperature reading is required, special tools exclusive for R32 are required.
Note 3 When saturation temperature is described, the gauge manifold differs for R410A and R32. If saturation
temperature reading is required, special tools exclusive for R32 are required.
Note 4 Like R410, a Vacuum pump adapter needs installing to prevent a Vacuum pump oil (mineral oil) from
flowing backward into the Charge hose. Mixing of the Vacuum pump oil into R32 refrigerant may cause
a trouble such as generation of sludge, clogging of capillary, etc.
Note 5 Be sure to use those tools after confirming they correspond to each refrigerant.
Note 6 For a refrigerant cylinder exclusive for R32, the paint color (or label color) of the cylinder is set to the
specified color (light blue) together with the indication of the refrigerant name.
Note 7 Although the container specification is the same as that of R410A, use a recovering container exclusive
for R32 to avoid mixing with other refrigerants.
Note 8 Be careful for miss charging of the refrigerant during work. Miss charging of the refrigerant type may cause
not only damage of the equipment but also a fire etc.
No. Installation/service tools Use Applicability to R32 air
conditioner or not
Applicability to R22 air
conditioner or not
Tools / Equipment specification
1 Flare tool Clutch type Pipe flaring 
2
Copper pipe gauge for
adjusting projection
margin
—Flaring by
conventional flare tool —
3 Torque wrench —Tightening of flare nut 
4 Gauge manifold
Port size
1/2"-20UNF
(5/16" Flare)
Evacuating,
refrigerant charge, run
check, etc.
Note 2 
5 Charge hose High-voltage 
6 Vacuum pump —Vacuum drying Note 3
1/2"-20UNF(5/16" Flare)
Connection diameter
1/4"
7Vacuum pump
adapter —Vacuum drying Note 4
1/2"-20UNF(5/16" Flare)
Connection diameter
1/4"
8Electronic balance for
refrigerant charging
For 10 kg or
20 kg
cylinder
Refrigerant charge 
9 Leakage detector —Gas leakage check Note 5 Note 5
10 Refrigerant cylinder —Refrigerant charge Note 6 
11 Refrigerant recovery
cylinder
Exclusive for
R32
Refrigerant recovery
container Note 7 
12 Refrigerant recovery
device —Refrigerant recovery device Note 8 Connection diameter
1/4"
General tools
IIn addition to the above exclusive tools, the following equipment is necessary as the general tools.
(1) Pipe cutter
(2) Reamer
(3) Pipe bender
(4) Level vial
(5) Screwdriver (+, –)
(6) Spanner or Adjustable wrench
(7) Hole core drill
(8) Tape measure
(9) Metal saw
Also prepare the following equipments for other installation method and run check.
(1) Clamp meter
(2) Thermometer
(3) Insulation resistance tester
(4) Electroscope

17
5. Safety precautions related to regulations on Installation and Service.
Make sure installation, servicing, maintenance and repair comply with instructions from TOSHIBA and with
applicable legislation (for example, national gas regulation) and are executed only by authorized people.
These safety cautions describe important matters concerning safety to prevent injury to users or other people and
damages to property. Please read through this manual after understanding the contents below (meanings of
indications), and be sure to follow the description.
WARNING
• Model that use refrigerant R32 and R410A have a different charging port thread diameter to prevent erroneous
charging with refrigerant R22 and for safety.
• Do not use means to accelerate the defrosting process or to clean, other than those recommended by the
manufacturer.
• The appliance shall be stored in a room without continuously operating ignition sources. (For example: open
flames, an operating gas appliance or an operating or an operating electric heater.)
• Do not pier d or burn.
• Be aware that refrigerants may not contain an odor.
• The manufacturer may provide other suitable examples or may provide additional information about the
refrigerant odor.
General (Installation space / area)
• The installation of pipe-work shall be kept to a minimum.
• Pipe-work shall be protected from physical damage.
• The compliance with national gas regulations shall be observed.
• The mechanical connections shall be assessable for maintenance purposes.
• In cases that require mechanical ventilation, ventilation openings shall be kept clear of obstruction.
• When disposing of the product is used, be based on national regulations with properly processed.
• The servicing shall be performed only as recommended by the manufacturer.
• Where the appliance using flammable refrigerants is installed, Be aware that;
- The appliance shall be stored in a well-ventilated area where the room size corresponds to the room area as
specified for operation.
- The appliance shall be stored in a room without continuously operating open flames (for example an operating gas
appliance) and ignition sources (for example an operating electric heater).
- The appliance shall be stored so as to prevent mechanical damage from occurring.
• Equipment piping in the occupied space shall be installed in such a way to protect against accidental damage in
operation and service.
• Precautions shall be taken to avoid excessive vibration or pulsation to refrigerating piping.
• Protection devices, piping and fittings shall be protected as far as possible against adverse environmental effects, for
example, the danger of water collecting and freezing in relief pipes or the accumulation of dirt and debris.
• Provision shall be made for expansion and contraction of long runs of piping.
• Piping in refrigerating systems shall be so designed and installed to minimize the likelihood hydraulic shock damaging
the system.
• Solenoid valves shall be correctly positioned in the piping to avoid hydraulic shock.
• Install the system according to Installation Manual and avoid the likelihood hydraulic shock damaging the system.
WARNING
(Risk of fire)
This mark is for R32 refrigerant only. Refrigerant type is written on nameplate
of outdoor unit.
In case that refrigerant type is R32, this unit uses a flammable refrigerant.
If refrigerant leaks and comes in contact with fire or heating part, it will create
harmful gas and there is risk of fire.
Read the OWNER’S MANUAL carefully before operation.
Service personnel are required to carefully read the OWNER’S MANUAL and INSTALLATION
MANUAL before operation.
Further information is available in the OWNER’S MANUAL, INSTALLATION MANUAL, and the
like.

18
• Solenoid valves shall not block in liquid refrigerant unless adequate relief is provided to the refrigerant system low
pressure side.
• Install the system according to Installation Manual so that it does not shut off in the liquid refrigerant.
• Steel pipes and components shall be protected against corrosion with a rustproof coating before applying any
insulation.
• Flexible pipe elements shall be protected against mechanical damage, excessive stress by torsion, or other forces.
They should be checked for mechanical damage annually.
• The indoor equipment and pipes shall be securely mounted and guarded such that accidental rupture of equipment
cannot occur from such events as moving furniture or reconstruction activities.
• Where safety shut off valves are specified, the minimum room area may be determined base on the maximum
amount of refrigerant that can be leaked as determined in Installation Manual.
• Where safety shut off valves are specified, the location of the valve in the refrigerating system relative to the occupied
spaces shall be as described in Installation Manual.
• When installing the system that used flammable refrigerant in a non-ventilated space, it shall be installed in the large
space or with safety equipment as designated below, so as to prevent the refrigerant from staying and causing a fire
of explosion by the refrigerant leak.
• The total refrigerant charge in the system cannot exceed the requirements for minimum floor area of the smallest
room that is served. For minimum floor area requirements for indoor units, see the
• Installation and Owner's Manual of the outdoor unit.
• When connecting to an outdoor unit of R32 refrigerant and using a leak detector, always turn on the power of the
indoor unit after installation except during service in order to detect refrigerant leakage and take safety measures.
• Precautions shall be taken to avoid excessive vibration or pulsation to refrigerating piping.
• Only mechanical fittings can be used. (Example; Brazing+flame connection)
• Refrigerating system shall use only permanent joints indoors except for site-made joints directly connecting the indoor
unit to the refrigerant piping, of factory made mechanical joints in compliance with ISO 14903.
Unventilated area
• The appliance shall be stored so as to prevent mechanical damage from occurring.
Installation
• Appliance shall be installed, operated and stored in a room with a floor area larger than [Amin] m2.
• For appliances using R32 refrigerant connected via an air duct system to one or more rooms,
• no auxiliary devices, which may be a potential ignition source, shall be installed in the duct work.(example:
hot surfaces with a temperature exceeding 700 °C and electric switching device)
• There shall be no operation ignition sources (example: open flames, an operating gas appliance or an operating
electric heater) in case the floor area is less than the minimum floor area A (m2)
• [Amin] is the minimum floor area.
Please refer to Installation Manual , in order to comply with the contents above.
• The total amount of refrigerant in the system must be less than or equal to the maximum allowable total amount of
refrigerant. The maximum allowable amount of refrigerant is 13.1 [kg].
• Keep the installation height according to the indoor unit type.
Ceiling-mounted unit (include Duct type) : 2.2m or more.
Wall- mounted and under celling unit : 1.8m or more.
But install the indoor unit at least 2.5m above the floor lever since otherwise the users may injure themselves or
receive electric shocks if they poke their fingers of other objects into the indoor unit while the air conditioner is
running.
• Connect both the air inlet and outlet of the duct directly to the same room.
• Do not use a space such as a false ceiling as the air inlet or the outlet of the duct.
• The position where the safety Shut-off valve can be installed differs depending on the setting of safety measures.
For more information on shut-off valves, see chapter 8-4-5 for deails.
Information on servicing
1. Check to the area
•Prior to begging work on systems containing flammable
ignition is minimized. For repair to the refrigerating system, the precautions in item 2 to 6 shall be complied with
prior to conducting work on the system.
2. Work procedure
•Work shall be undertaken under a controlled procedure so as to minimize the risk of a flammable gas or vapor
being present while the work is being performed.
•When connecting to an outdoor unit of R32 refrigerant and using a leak detector, the fan may automatically
operate even if the air conditioner is stopped when a refrigerant leak is detected.
Be careful not to get injured by the fan.

19
•All installers and others working in the local area shall be instructed on the nature of work being carried out.
Work in confined spaces shall be avoided.
3. General work area
•All maintenance staff and others working in the local area shall be instructed on the nature of work being
carried out.
•Work in confined spaces shall be avoided.
•The area around the workspace shall be sectioned off.
•Ensure that the conditions within the area have been made safe by control of flammable material.
•Only equipment approved by the manufacturer shall be used for duct work.
4. Checking for presence of refrigerant
•The area shall be checked with an appropriate refrigerant detector prior to and during work, to ensure the
technician is aware of potentially flammable atmospheres.
•Ensure that the leak detection equipment being used is suitable for use with all applicable refrigerants, i.e. non
sparking, adequately sealed or intrinsically safe.
5. Presence of fire extinguisher
•If any hot work is to be conducted on the refrigeration equipment or any associated parts, appropriate fire
extinguishing equipment shall be available on hand.
•Have a dry powder of CO2 fire extinguisher adjacent to the charging area.
6. No ignition sources
•No person carrying out work in relation to a refrigeration system which involves exposing any pipe work shall use
any sources of ignition in such a manner that it may lead to the risk of fire of explosion.
•All possible ignition sources including cigarette smoking, should be kept sufficiently far away from the site of
installation, repairing, removing and disposal, during which refrigerant can possibly be released to the surrounding
space.
•Prior to work taking place, the area around the equipment is to be surveyed to make sure that there are no
flammable hazards or ignition risks. "No Smoking" signs shall be displayed.
•Make sure that the exhaust port of the vacuum pump is not close to the ignition source and that ventilation is
possible.
7. Ventilated area
•Ensure that the area is in the open or that it is adequately ventilated before breaking into the system or conducting
any hot work.
•A degree of ventilation shall continue during the period that the work is carried out.
•The ventilation should safely disperse any released refrigerant and preferably expel it externally into the
atmosphere.
8. Check to the refrigeration equipment
•Where electrical components are being changed, installer shall be fit for the purpose and to the correct
specification.
•At all times the manufacturer's maintenance and service guidelines shall be followed. If in doubt consult the
manufacturer's technical department for assistance.
•The following checks shall be applied to installations using flammable refrigerants.
-The charge size is in accordance with the room size within which the refrigerant containing parts are installed.
-The ventilation machinery and outlets are operating adequately and are not obstructed.
-If an indirect refrigerating circuit is being used, the secondary circuit shall be checked for the presence of
refrigerant.
-Marking to the equipment continues to be visible and legible.
Markings and signs that are illegible shall be corrected.
-Refrigeration pipe or components are installed in a position where they are unlikely to be exposed to any
substance which may corrode refrigerant containing components, unless the components are constructed of
materials which are inherently resistant to being corroded or are suitably protected against being so corroded.
9. Checks to electrical devices
•Repair and maintenance to electrical components shall include initial safety checks and component inspection
procedures.
•It a fault exists that could compromise safety, then no electrical supply shall be connected to the circuit until it is
satisfactorily dealt with.
•If the fault cannot be corrected immediately but it is necessary to continue operation, an adequate temporary
solution shall be used.
•This shall be reported to the owner of the equipment so all parties are advised.
•Initial safety checks shall include;