Fujitsu Airstage AGUA12TLAV1, Design & Technical Manual

Page: 881 / 978

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1-2. CHECKING CONCENTRATION LIMIT
Check concentration limit following steps

, and take appropriate measures depending on
the situation.

Calculate amount of refrigerant [lbs. (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 refrigerant per
refrigerant system
Amount of additional
refrigerant
Total amount of refrigerant in
system (lbs, kg)
+ =
Amount of factory
charged refrigerant
Amount of refrigerant
added to system based
on pipe length, pipe size
and indoor units.
Note : When one refrigerant
system is divided into 2 or more
refrigerant systems and each
system is independent, total
amount of refrigerant of each
system shall be adopted.
Total amount of refrigerant in
refrigerant system (lbs,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 [lbs./Mcf
(kg/m 3 )]
(R410A)
Capacity of smallest
room where indoor unit is
installed [cf (m
3
)]
(a) Without partition
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.
(c) With partition and without
opening which serve as
passage of air to adjoining
room.
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