Checking Concentration Limit - Fujitsu AIRSTAGE J-II Design & Technical Manual

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.
Amount of replenished
refrigerant per refrigerant
system
Amount of replenished
refrigerant at factory
shipment
 Smallest room volume.
Calculate room volume by regarding
(a) Without partition
(c) With partition and without
opening which serve as
passage of air to adjoining
room.
Indoor unit
Smallest
room
 Calculate refrigerant concentration from the results of  and 
Total amount of
replenished refrigerant in
refrigerant facility (kg)
Capacity of smallest
room where indoor unit is
installed (m 3
Amount of additional
+
replenished refrigerant
Amount of additionally
replenished refrigerant
depending on piping
length , piping diameter
and indoorunit model at
customer.
Outdoor unit
Indoor unit
Outdoor unit
≤Refrigerant concentration (kg/m
(R410A)
)
=
portion as one room or the smallest room.
(b) When there are partitions,
but there is an effective
opening for ventilation between
the rooms.
Opening
Indoor unit
(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.
When the result of calculation
exceeds the limiting
3
)
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.
- (09 - 02) -
Total amount of replenished
refrigerant in refrigerant
system (kg)
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.
Outdoor unit
Partition
Outdoor unit