Checking Concentration Limit - Fujitsu AOU48RLXFZ Design & Technical Manual

11-2.

CHECKING CONCENTRATION LIMIT

Check concentration limit following steps 12 , and take appropriate measures depending on
the situation.
1 Calculate amount of all replenished refrigerant [lb (kg)] per refrigerant system.
Amount of replenished
refrigerant per refrigerant
system
Amount of replenished
refrigerant at factory
shipment
2 Smallest room volume.
Calculate room volume by regarding
(a) Without partition
Branch box
Indoor unit
(c) With partition and without
opening which serve as
passage of air to adjoining
room.
Branch box
Small
Indoor unit
est
room
3 Calculate refrigerant concentration from the results of 1 and 2
Total amount of
replenished refrigerant in
refrigerant facility [lb (kg)]
Capacity of smallest
room where indoor unit is
3
installed [cf (m
Amount of additional
+
replenished refrigerant
Amount of additionally
replenished refrigerant
depending on piping
length , piping diameter
and indoorunit model at
customer.
Outdoor unit
Outdoor unit
≤Refrigerant concentration [lb/Mcf
(R410A)
)]
- (06 - 127) -
Total amount of replenished
= refrigerant in refrigerant
system [lb (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.
portion as one room or the smallest room.
(b) When there are partitions,
but there is an effective
opening for ventilation
between the rooms.
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.
Branch box
When the result of calculation
exceeds the limiting
concentration,perform the same
3
(kg/m )]
calculations by shifting to the
second smallest,and the third
smallest rooms until the final result
is below the limiting concentration.
Outdoor unit
Branch box
Opening
Partition
Outdoor unit
6. SYSTEM DESIGN