Sanyo SGP-M2 Manuel D'installation page 28

Installation guidelines to ensure safety in the event of
refrigerant leakage with a multi-type package A/C
(JRA-GL13-1998)
If the above relationship is not satisfi ed, use the following
guidelines to select and install the system, and to prepare
adequate mechanical ventilation devices.
1. Selecting the A/C system
The maximum values for the refrigerant charge that
can be selected for each room volume are indicated
by the area outside the range of diagonal lines in Fig.
6. If the value is within the range of the diagonal lines,
then either effective openings for ventilation must be
created to increase the room volume, or the outdoor
unit capacity and/or tubing length must be changed to
reduce the amount of total refrigerant charge. How-
ever, this is not necessarily the case when 2 or more
independent measures are taken to ensure the safety
of persons inside the room in the event of refrigerant
leakage.
2. Selecting an indoor unit type
An indoor unit with an installation position 2 m or higher
above the fl oor is recommended.
3. Restrictions on the tubing connections between
living spaces
Tubing connections must be subjected to a reliable
airtightness test after the completion of work. The test
must conform to JIS-B-8607 (refrigerant fl ared and
brazed joints).
4. Combined use of a ventilation system
(a) Mechanical ventilation devices must be used in
order to reduce the concentration of leaked refriger-
ant.
(b) Mechanical ventilation devices which introduce
outside air at a location 2 m or higher above the
room fl oor are recommended.
(c) The ventilation volume of the mechanical ventilation
devices must be at or above the volume shown in
Fig. 6, according to the amount of refrigerant gas
and room volume.
(d) Be sure to create openings that improve ventilation
(such as the bottom gap of room doors).
(e) The ventilation system must operate at all times,
regardless of whether the A/C device is in use or
not, and regardless of whether there are persons
in the room or not. If this is not possible, a sensor
system must be used to automatically operate the
ventilation system when refrigerant leakage is de-
tected.
5. Restrictions and precautions for tubing installa-
tion
(a) Tubing must include earthquake-resistant support
to prevent damage resulting from earthquakes or
other external forces.
(b) When adding support to the tubing, create relief
in the axial direction to prevent the occurrence of
thermal stress.
6. Flowchart showing refrigerant leakage measures:
Omitted
Room volume (m 3 )
150
Total amount of refrigerant
charge (kg) for the system
≤ 0.3 kg/m
Room volume
100
50
0
0 10 20
Total amount of refrigerant charge (kg) for refrigerant equipment
Fig. 6 Selecting a System According to
Ventilation Volume
• If the following is true in Fig. 6, then ventilation devices
with the indicated ventilation volume are required: 2/3 >
Total amount of refrigerant charge for the system / Room
volume > 0.3
• The range indicated by
Total amount of refrigerant charge for the system / Room
volume ≥ 2/3. If the value is within the range indicated
by , either the room must be enlarged (for example,
by removing a door connecting to the next room), or the
outdoor unit must be reduced in size.
• For example, consider the case where a 2.8 kW indoor
unit is installed in a 16.5 m
nected to a single 56.0 kW outdoor unit. If 18 kg of
refrigerant is added to the charge, the total charge is
17 + 18 = 35 kg.
35 ÷ (16.5 × 2.7) = 0.79 > 2/3 (= 0.67)
Because this is within the range on the graph indicated by
, either the room must be made larger or the outdoor
unit must be reduced in size.
GB - 28
Ventilation volume
3
0 m /h
3
10 m /h
3
15 m 3 /h
20 m 3 /h
25 m 3 /h
30 m 3 /h
If the value is within this range,
then either effective openings
for ventilation must be created 3
33 m /h
to increase the room volume,
or the outdoor unit capacity
and/or tubing length must be
changed to reduce the amount
of total refrigerant charge.
30 40 50
in Fig. 6 is the range in which:
2
, 2.7 mH room, and is con-