Mitsubishi Electric HYBRID CITY MULTI Series User manual

SAFETY HANDLING FOR R32
MEES18K085 1
CONTENTS SAFETY HANDLING FOR R32
I.SAFETY HANDLING FOR R32
1. Caution for refrigerant leakage ................................................................................................................. 2
1-1. Refrigerant property......................................................................................................................... 2
1-2. Confirm the Critical concentration and take countermeasure .......................................................... 2
2. Installation restrictions .............................................................................................................................. 3
2-1. Installing the outdoor unit or the Hydro unit outdoor........................................................................ 3
2-2. Installing the Hydro unit or the HBC indoor ..................................................................................... 5
3. Installation flow chart ................................................................................................................................ 6
4. Installation chart annex ............................................................................................................................. 10
5. Regulatory requirements list for safety measures..................................................................................... 13
0000005090.BOOK 1 ページ ２０１８年１２月２７日 木曜日 午前１０時３分

MEES18K085
SAFETY HANDLING FOR R32
2
1. Caution for refrigerant leakage SAFETY HANDLING FOR R32
I.SAFETY HANDLING FOR R321. Caution for refrigerant leakage
The installer and/or air conditioning system specialist shall secure safety against refrigerant leakage according to local regulations or standards.
The following standard may be applicable if no local regulation or standard is available.
1-1. Refrigerant property
1-2. Confirm the Critical concentration and take countermeasure
The maximum refrigerant leakage concentration (Rmax) is defined as the result of the possible maximum refrigerant
weight (Wmax) leaked into a room divided by its room capacity (V). The refrigerant of Outdoor unit here includes its original
charge and additional charge at the site.
The additional charge is calculated according to the refrigerant charging calculation of each kind of Outdoor unit, and shall
not be over charged at the site. Procedure 1-2-1~3 tells how to confirm maximum refrigerant leakage concentration
(Rmax) and how to take countermeasures against a possible leakage.
1-2-1. Find the possible maximum leakage (Wmax) in the room. If a room has HBC(s) from more than 1 Outdoor unit, add
up the refrigerant of the Outdoor units.
1-2-2. Divide (Wmax) by (V) to get the maximum refrigerant leakage concentration (Rmax).
1-2-3. Find if there is any room in which the maximum refrigerant leakage concentration (Rmax) is over 0.063kg/m3.
If no, then the HYBRID CITY MULTI is safe against refrigerant leakage.
If yes, following countermeasure is recommended to do at site.
Countermeasure 1: Smaller total charge (making Wmax smaller)
e.g.Avoid connecting more than 1 Outdoor unit to one room.
e.g.Using smaller model size but more Outdoor units.
e.g.Shorten the refrigerant piping as much as possible.
Note 1. In principle, MITSUBISHI ELECTRIC requires proper piping design, installation and air-tight testing after
installation to avoid leakage happening.
In the area should earthquake happen, anti-vibration measures should be fully considered.
The piping should consider the extension due to the temperature variation.
R32 refrigerant has lower flammability (A2L refrigerant: ISO817, 2014). The R32 is heavier than the indoor air in density.
Leakage of the refrigerant in a room has possibility to lead to a hypoxia situation and fire. Therefore, the critical concentration specified
below shall not be exceeded even if the leakage happens.
Critical concentration
Critical concentration hereby is the refrigerant concentration in which no human body would be hurt if immediate measures can be taken
when refrigerant leakage happens.
Critical concentration of R32: 0.063kg/m
3
(The weight of refrigeration gas per 1 m
3
air conditioning space.);
* The Critical concentration is subject to ISO5149 (2014), EN378-1 (2016).
For the HYBRID CITY MULTI system, the concentration of refrigerant leaked should not have a chance to exceed the critical concentration
in any situation.
0000005090.BOOK 2 ページ ２０１８年１２月２７日 木曜日 午前１０時３分

MEES18K085
SAFETY HANDLING FOR R32
3
2. Installation restrictions SAFETY HANDLING FOR R32
2. Installation restric tions
Observe the following restrictions that apply to the installation of units.
2-1. Installing the outdoor unit or the Hydro unit outdoor
Do not install the unit where combustible gas may leak.
- If combustible gas accumulates around the unit, fire or explosion may result.
Provide sufficient space around the unit for effective operation, efficient air movement, and ease of access for maintenance.
Note that refrigerant gas is heavier than air and will therefore tend to collect in low spots such as basements.
R32 is heavier than air—as well as other refrigerants—so tends to accumulate at the base (in the vicinity of the floor). If R32
accumulates around the base, it may reach a flammable concentration in case the room is small. To avoid ignition, maintain a
safe work environment by ensuring appropriate ventilation. If the refrigerant leaks in a room or an area that has insufficient
ventilation, refrain from using flames until the work environment is improved by ensuring appropriate ventilation.
Do not install the outdoor unit in a basement or machinery room, where the refrigerant stagnates. *1
Install the unit in a place where at least one of the four sides is open.
* Refer to the Installation manual for other general precautions on installation.
*1 In the case of hydro unit, please refer to “2-2. Installing the Hydro unit or the HBC indoor”
Figure 1
Install units in a place where at least one of the four sides is open or in a sufficiently large space without depressions.
*The following examples show an outdoor unit.
Correct installation
Wrong installation
(Example: basement)
0000005090.BOOK 3 ページ ２０１８年１２月２７日 木曜日 午前１０時３分

MEES18K085
SAFETY HANDLING FOR R32
4
2. Installation restrictions SAFETY HANDLING FOR R32
B
Install the unit in a space with a wall height of ≤ 0.125 m.
C
Wall height ≤ 0.125 m
Create an appropriate ventilation open area.
Wall height ≤ 0.125 m
(No restrictions apply to
the refrigerant amount)
Opening:
• Must occupy 80% of the
longitudinal side of a space.
• Must have an opening ratio of
75% or higher.
Height of an opening
≥ 0.15 m
Height from the ground to
an opening ≥ 0.125 m
Width of an opening
≥ 0.9 m
Longitudinal
direction
(Example: space with a louver)
A
Amin
M [kg]
10
20
30
40
50
60
112
223
334
445
556
667
Amin [m
2
]
Install the unit in a space with an installation area of Amin or more, corresponding to the refrigerant amount (M).
(M = factory-charged refrigerant + refrigerant to be added on site)
Secure sufficient installation space (minimum installation area: Amin).
If the unit needs to be installed in a space where all four sides are blocked, confirm that one of these situations
(A, B, or C) is satisfied.
0000005090.BOOK 4 ページ ２０１８年１２月２７日 木曜日 午前１０時３分

MEES18K085
SAFETY HANDLING FOR R32
5
2. Installation restrictions SAFETY HANDLING FOR R32
2-2. Installing the Hydro unit or the HBC indoor
When installing Hydro unit/HBC in machinery room or small room, take safety measures in accordance with the European
Standard, based on the system refrigerant amount and the room volume as shown in the figure 2.
(The installation restrictions can be simply found by using the flowchart.)
Figure 2
Refrigerant concentration and required quantity of safety measures
(height of ceiling space = 1.8 m)
0
10
20
30
40
50
60
70
80
0 50 100 150 200 250 300 350 400 450 500 550 600 650
SyStem refrigerant amount [kg]
NG (ISO 5149)
At least two
safety measures
are required.
At least one
safety measure
is required.
Construction guidance
Room volume [m
3
]
Do not place an ignition source in a space where Hydro unit/HBC is installed or adjacent spaces not shielded by firewalls.
Examples: Lighters, combustion heaters, combustion boilers, and combustion cookers
All of the above-mentioned restrictions apply not only to new installations but also to relocations and layout changes.
0000005090.BOOK 5 ページ ２０１８年１２月２７日 木曜日 午前１０時３分

MEES18K085
SAFETY HANDLING FOR R32
6
3. Installation flow chart SAFETY HANDLING FOR R32
3. Installation flow chart
Using the flowchart, make sure the installation restrictions that apply to R32 HVRF models are met.
Even if "Installation OK" is reached in the flowchart, see "Installation chart annex".
*This flow chart was created based on IEC60335-2-40 (ver. 6) and ISO5149 (2014).
Ventilation
system is located in the
space where Hydro unit/HBC
is installed.
The
ventilation ratio of the
ventilation system is 4
times or more.
The
extraction opening
of the ventilation system is
located at the height of
100mm or lower from
the floor.
Hydro
unit/HBC is
installed in the space where
the refrigerant concentration is less
than 0.063 (kg/m3) when
refrigerant
leaks.
Hydro
unit/HBC is installed
in the space where the
refrigerant concentration is less
than 0.16 (kg/m
3
) when
refrigerant
leaks.
Unauthorized
person is prohibited to enter
the space where Hydro unit/HBC
is installed.
Combustion
equipment is NOT placed in
the space where Hydro unit/HBC
is installed.
Hydro
unit/HBC is installed at
the height of 1.8m or
higher.
Hydro
unit/HBC is installed on
the ceiling of a space except on
the lowest basement
floor.
Alarm
required by applicable
regulations is installed
additionally.
STARTSTART
Installation OKInstallation OK
(1) Machinery room
installation
(Continuous ventilation)
Machinery room
installation
Small room
installation
NO
NO
NO
NO
NO
Installation OKInstallation OK
(2) Small room
installation
(No safety measures)
Installation OKInstallation OK
(3) Small room
installation
(Alarm)
NO
NO
NO
NO
NO
<Air volume
requirement>
IEC/GG.5
ISO/part3-5.13.2
<Lowest
basement floor
requirement>
IEC/GG.10.3.1
ISO/part1-A.5.2.2
<Alarm
requirement>
IEC/GG.13
ISO/part3-8
<Refrigerant
concentration
determination>
IEC/GG.10.4
/GG.10.5
ISO/part1-A.5.2.2
/A.5.2.3
<Circulation
requirement>
IEC/GG.10.2
<Extraction opening
requirement>
IEC/GG.8.3.3
ISO/
part3-5.13.1 and 5
<Restricted access
requirement>
IEC/GG.5
ISO/part1-3.2.5
(part3-5.1)
<Combustion
equipment restriction>
IEC/GG.5
ISO/part3-5.14.3
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
0000005090.BOOK 6 ページ ２０１８年１２月２７日 木曜日 午前１０時３分

MEES18K085
SAFETY HANDLING FOR R32
7
3. Installation flow chart SAFETY HANDLING FOR R32
Hydro
unit/HBC is
installed in the space where
the refrigerant concentration is
less than 0.16 (kg/m
3
)
when refrigerant
leaks.
Two safety
measures: alarm
and shut-off valves required
by applicable regulations, are
installed additionally.
Two safety
measures: alarm
and ventilation required by
applicable regulations, are
installed additionally.
Two safety
measures: shut-off
valves and ventilation required
by applicable regulations, are
installed additionally.
Shut-off valves
required by applicable
regulations are installed
additionally.
Mechanical
ventilation required by
applicable regulations is installed
additionally.
Small room
installation
Installation
not allowed
Installation
not allowed
Installation
not allowed
Installation
not allowed
Installation OKInstallation OK
(4) Small room
installation
(Alarm+Shut-off valves)
NEXT PAGE
NO
NO
NO
<Refrigerant concentration
determination>
IEC/GG.10.4/GG.10.5
ISO/part1-A.5.2.2/A.5.2.3
Installation OKInstallation OK
(5) Installation on
ceiling
(Alarm+Ventilation)
NO
Installation OKInstallation OK
(6) Small room
installation
(Shut-off valves+Ventilation)
NO
Installation
not allowed
Installation
not allowed
NO
Installation OKInstallation OK
(7) Small room
installation
(Shut-off valves)
<Shut-off valve
requirement>
IEC/GG.12
ISO/part3-6.4
Installation OKInstallation OK
(8) Small room
installation
(Mechanical ventilation)
<Mechanical
ventilation
requirement>
IEC/GG.11.3
ISO/part3-6.3.3
YES
YES YES
YES YES YES
0000005090.BOOK 7 ページ ２０１８年１２月２７日 木曜日 午前１０時３分

MEES18K085
SAFETY HANDLING FOR R32
8
3. Installation flow chart SAFETY HANDLING FOR R32
Installation OKInstallation OK
Installation
not allowed
Installation
not allowed
Air-circulation
device required by applicable
regulations is
installed.
Shut-off valves
required by applicable
regulations are installed
additionally.
NO
Small room
installation
(11) Small room installation
(Circulation+Alarm+Shut-off
valves)
NO
NO
NO
<Circulation
requirement>
IEC/GG.10.2
ISO/part3-6.2
<Shut-off valve
requirement>
IEC/GG.12
ISO/part3-6.4
(14) Small room installation
(Circulation+Shut-off
valves)
YES
Hydro
unit/HBC is installed
on the ceiling except on the
lowest basement
floor.
Alarm
required by applicable
regulations is installed
additionally.
NO
NO NO
NO
YES
YES
YES
YES
YES
Hydro
unit/HBC is installed
in the space where the
refrigerant concentration is less
than 0.063 (kg/m
3
) when
refrigerant
leaks.
Hydro
unit/HBC is
installed in the space where
t
he refrigerant concentration is less
than 0.16 (kg/m
3
) wh en
refrigerant
leaks.
Hydro
unit/HBC is
installed in the space where
the refrigerant concentration is
less than 0.16 (kg/m
3
)
when refrigerant
leaks.
Two safety
measures: alarm
and shut-off valves required
by applicable regulations, are
installed additionally.
(9) Small room
installation
(Only circulation)
NO
YES YES
(10) Small room
installation
(Circulation+Alarm)
<Lowest basement
floor requirement>
IEC/GG.10.3.1
ISO/part1-A.5.2.2
<Alarm
requirement>
IEC/GG.13
ISO/part3-8
<Refrigerant
concentration
determination>
IEC/GG.10.4/GG.10.5
ISO/part1-A.5.2.2
/A.5.2.3
<Refrigerant
concentration
determination>
IEC/GG.10.4/GG.10.5
ISO/part1-A.5.2.2/A.5.2.3
Installation OKInstallation OK
Installation OKInstallation OK
Installation OKInstallation OK
Installation
not allowed
Installation
not allowed
0000005090.BOOK 8 ページ ２０１８年１２月２７日 木曜日 午前１０時３分

MEES18K085
SAFETY HANDLING FOR R32
9
3. Installation flow chart SAFETY HANDLING FOR R32
Installation OKInstallation OK
Installation OKInstallation OK Installation OKInstallation OK
Installation
not allowed
Installation
not allowed
Installation
not allowed
Installation
not allowed
Mechanical
ventilation system required by
applicable regulations is installed
additionally.
(12) Ceiling space installation
(Circulation+Alarm+
Ventilation)
NO
NO
(15) Small room installation
(Circulation+Mechanical
ventilation)
<Mechanical
ventilation
requirement>
IEC/GG.11.3
ISO/part3-6.3.3
NO
YES
YES YES
Two safety
measures: alarm
and ventilation required by
applicable regulations, are
installed additionally.
Two safety
measures: shut-off
valves and ventilation required
by applicable regulations, are
installed additionally.
Small room
installation
(13) Small room installation
(Circulation+Shut-off
valves+Ventilation)
0000005090.BOOK 9 ページ ２０１８年１２月２７日 木曜日 午前１０時３分

MEES18K085
SAFETY HANDLING FOR R32
10
4. Installation chart annex SAFETY HANDLING FOR R32
4. Installation chart annex
<Installation example of safety measures>
* The alarm shall warn audibly and visibly such as both a loud buzzer and flashing light.
* Refer to the Installation manuals of the Hydro unit and of the HBC for installation instructions.
Hydro unit/HBCHydro unit/HBCHydro unit/HBC Hydro unit/HBCHydro unit/HBC
(Continuously)
Mechanical ventilation
(Continuously)
Mechanical ventilation
(Continuously)
Mechanical ventilation
Exhaust
ExhaustExhaust
Hydro unit/HBCHydro unit/HBCHydro unit/HBC Hydro unit/HBCHydro unit/HBCHydro unit/HBC
Hydro unit/HBC
Hydro unit/HBCHydro unit/HBC Hydro unit/HBC
Hydro unit/HBCHydro unit/HBC
Supervised locationSupervised locationSupervised location
Supervised locationSupervised locationSupervised location Supervised locationSupervised locationSupervised location
Concentration
check Concentration
check
Concentration
check
Concentration
check
Unoccupied space not designated a machinery room
Unoccupied space not designated a machinery room
Unoccupied space not designated a machinery room
Unoccupied space not designated a machinery room
(3) Small room installation (Alarm)
(2) Small room installation (No safety measures)
(4) Small room installation (Alarm + Shut-off valves) (5) Installation on ceiling (Alarm + Ventilation)
Height≥ 1.8mHeight≥ 1.8mHeight≥ 1.8m Height≥ 1.8m
Height≥ 1.8mHeight≥ 1.8m
Leak detector
+ alarm
Leak detector
+ alarm
Alarm (Hospital etc)
Alarm (Hospital etc)Alarm (Hospital etc)
Height≥ 1.8m
Height≥ 1.8mHeight≥ 1.8m
Alarm (Hospital etc)
Alarm (Hospital etc)Alarm (Hospital etc)
Shut-off
valve
Shut-off
valve
Shut-off
valve
SupplySupply
(Continuously)
Mechanical ventilation
(Continuously)
Mechanical ventilation
(Continuously)
Mechanical ventilation
Exhaust
ExhaustExhaust
Height≥ 1.8mHeight≥ 1.8mHeight≥ 1.8m
Leak detector
+ alarm
Leak detector
+ alarm
Leak detector
+ alarm
Leak detector
+ alarm
Alarm (Hospital etc)
Alarm (Hospital etc)Alarm (Hospital etc)
(1) Machinery room installation (Continuous ventilation)
Machinery room Machinery room
The mechanical
ventilation mustn't
be installed in the
higher postition in
the room.
(Continuously)
Mechanical ventilation
(Continuously)
Mechanical ventilation
(Continuously)
Mechanical ventilation
Exhaust
ExhaustExhaust
SupplySupply SupplySupply
Hydro
Hydro
Mach
0000005090.BOOK 10 ページ ２０１８年１２月２７日 木曜日 午前１０時３分