Installation Manual
– 38 –
EN
NOTE 2
The standards for minimum room volume are as follows.
(1) No partition (shaded portion)
(2) When there is an effective opening with the
adjacent room for ventilation of leaking refrigerant gas
(opening without a door, or an opening 0.15% or
larger than the respective floor spaces at the top or
bottom of the door).
(3) If an indoor unit is installed in each
partitioned room and the refrigerant
piping is interconnected, the smallest
room of course becomes the object. But
when a mechanical ventilation is
installed interlocked with a gas leakage
detector in the smallest room where the
density limit is exceeded, the volume of
the next smallest room becomes the
object.
NOTE 3
The minimum indoor floor area compared with the amount
of refrigerant is roughly as follows:
(When the ceiling is 2.7m high)
Important
Outdoor unit
Refrigerant piping
Indoor unit
Refrigerant piping
Outdoor unit
Indoor unit
Mechanical ventilation device - Gas leak detector
Very small room
Small
room
Medium
room
Large room
0
5
10
10
20
30
15
20
25
30
35
40
m
2
M
in. i
n
do
or
floor
ar
ea
Total amount of refrigerant
kg
Range below the
density limit of
0.3 kg/m
3
(countermeasures
not needed)
Range above the density
limit of 0.3 kg/m
3
(countermeasures
needed)
EN-75
1FAN_IM_DHV0100301-00_EN.book Page 38 Saturday, November 4, 2017 2:39 PM
