Fujitsu AB* A12GATH, Design & Technical Manual

Page: 1019 / 1124

1-2. CHECKING CONCENTRATION LIMIT
Check concentration limit following steps

, and take appropriate measures depending on
the situation.

Calculate amount of all replenished refrigerant (kg) per refrigerant system.

Smallest room volume.
Calculate room volume by regarding portion as one room or the smallest room.

Calculate refrigerant concentration from the results of

and

Amount of replenished
refrigerant per refrigerant
system
Amount of additional
replenished refrigerant
Total amount of replenished
refrigerant in refrigerant
system (kg)
+ =
Amount of replenished
refrigerant at factory
shipment
Amount of additionally
replenished refrigerant
depending on piping
length , piping diameter
and indoorunit model at
customer.
Note : When one refrigerant
system is divided into 2 or more
refrigerant systems and each
system is independent, total
amount of replenished refrigerant
of each system shall be adopted.
Total amount of
replenished refrigerant in
refrigerant facility (kg)
When the result of calculation
exceeds the limiting
concentration,perform the same
calculations by shifting to the
second smallest,and the third
smallest rooms until the final result
is below the limiting concentration.
≤Refrigerant concentration (kg/m
3
)
(R410A)
Capacity of smallest
room where indoor unit is
installed (m
3
)
(a) Without partition
Outdoor unit Outdoor unit
Outdoor unit Outdoor unit
Indoor unit
Indoor unit
Smallest
room
Indoor unit
Partition
Opening
(b) When there are partitions,
but there is an effective
opening for ventilation between
the rooms.
(d) When a mechanical
ventilation device linked to a gas
leak detection warning device is
mounted in the smallest room.
The room with the second
smallest area is the target.
(c) With partition and without
opening which serve as
passage of air to adjoining
room.
- (09 - 02) -
N
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