34-EN
33-EN
– 17 –
WARNING
• 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 = (The number of connected indoor units) x 15.96 [kg] and the
maximum is 63.85 [kg].
• Keep the installation height according to the indoor unit type.
Ceiling-mounted unit (include Duct type.) : 2.2 m or more.
For Duct type, both inlet and outlet shall be placed at least 2.2 m.
Inlet and outlet shall not be located above the unit.
Wall-mounted and under ceiling unit : 1.8 m or more.
But install the indoor unit at least 2.5 m above the
fl
oor level since otherwise the users may injure themselves or
receive electric shocks if they poke their
fi
ngers or other objects into the indoor unit while the air conditioner is
running.
NOTE
• The maximum total amount of refrigerant allowed depends on the area of the room the system serves and the
room on the lowest
fl
oor of the basement.
• Please con
fi
rm that the condition for total system refrigerant amount is satis
fi
ed for [ 5 ] [To determine the limit
on the amount of additional refrigerant].
If the installation becomes impossible in the condition of [1], redesign the system again.
[ 2 ] [Safety measures]
This unit is equipped with a refrigerant leak detector and safety Shut-off Valves for safety.
For each indoor unit, the number of safety devices varies depending on the installation
fl
oor, total system
refrigerant amount, indoor unit installation height, and LFL value.
It’s not necessary to install the safety devices when the air conditioning system is installed in a large space of
LFL/4 or less.(each indoor room, outdoor area)
LD : Leak Detector
SV : Shut-off Valve
FS : Flow Selector
Area
Safety system
Safety measures
Safety system operation
subsequent status
(a)
No safety
measures
0 pc. -
No safety system operation.
Not applicable
(a)(b)
Leak Detector
only.
1 pc. LD
When a leak is detected, operation
stops.
Operation cannot be
continued.
(a)(b)
(c)
Pump-down
operation.
2 pcs. LD, FS unit or
SV unit
When a leak is detected, a system
does Refrigerant recovery to
Outdoor unit side by pump-down
operation and closes all safety
shut-off valves. After that, all
systems stop.
Operation cannot be
continued.
(Refrigerant system
will be locked.)
(a)(b)
(c)
Individual
shut-off
operation.
2 pcs. LD, FS unit (single port)
or SV unit
When a leak is detected, safety
Shut-off Valves close only for the
indoor units which refrigerant is
leaked. After that, all systems stop.
Operation cannot
be continued only
for the indoor units
which refrigerant
is detected. Other
indoor units can
continue to operate.
WARNING
• For the refrigerant leak detector to function, the unit shall be powered on at all times after installation, except
during service.
• If LFL area is (c), install Battery kit in each applicable Flow Selector unit and Shut-off Valve unit.
They can shut-off the refrigerant by Battery kits even in the event of a power failure.
(Make sure there are no leaks before use as charging may not be in time during a continuous system power off.)
NOTE
• If there are multiple indoor units with different safety systems in refrigerant system, safety system behaviors may
be different in each indoor unit
(Installation patterns for each safety measure)
The table below shows installation example of safety measures for each safety system.
Position where Leak Detector and Flow Selector unit, Shut-off Valve unit can be installed is determined by room
area, combination, indoor unit type and capacity, etc.
For details, refer to [ 3 ] [Leak Detector installation] and [ 4 ] [Safety shut-off valve installation].
[Each safety system and installation example]
FS : Flow Selector
CODE
No.
[107]
Installation example
Case
[00]
FS-M
Area (a)
a
e
b
b
b
When installing in a room corresponding to
area (a), set the CODE No. [107] to [00].
No additional safety measures are required.
[01]
FS-M
Area (c)
Area (c)
Area (c)
a
e
f
b
c
c
c
b
b
When installing in a room corresponding to
area (c), set the CODE No. [107] to [01] or [02].
Be sure to install a refrigerant leak detector.
Be sure to connect the FS unit (or Shut-off
Valve unit) and install the battery unit.
When the CODE No. [107] is set to [01], the
entire system will be stopped when refrigerant
leakage is detected.
پ
In the [01] setting and [02] setting of the
CODE No. [107], the position where the FS
unit (or Shut-off Valve unit) can be installed is
different.
