Checking Concentration Limit - Fujitsu Airstage J-IVS AJ 040LCLDH Series Design & Technical Manual

1-2. Checking concentration limit

Check concentration limit following step 1 and 2, and take appropriate measures depending on the
situation.
1. Calculate amount of refrigerant per refrigerant system.
Amount of refrigerant
system
Amount of factory
charge
2. Calculate room volume by regarding portion marked in gray as one room or the smallest room.
(a) Without partition
(c) When there are partitions, but there is an
effective opening for ventilation between the
rooms.
Indoor unit
Smallest room
1-2. Checking concentration limit
Amount of additional
+
refrigerant
Amount of refrigerant
added to system
based on pipe
length, pipe size,
and indoor units
Outdoor unit
Indoor unit
Outdoor unit
Total amount of refrigerant in
=
When one refrigerant system is
divided into 2 or more refrigerant
systems and each system is in-
dependent, total amount of refrig-
erant of each system shall be
(b) When there are partitions, but there is an
effective opening for ventilation between the
rooms.
Opening
Indoor unit
(d) With partition and without opening which
serve as passage of air to adjoining room.
The room with the second
smallest area is the target.
- (09-2) -
Unit: kg
system
adopted.
Outdoor unit
Partition
Outdoor unit
Indoor unit
1. Refrigerant leakage caution