Check Of Density Limit - Panasonic U-8ME1E8 Mode D'emploi

SUPPLEMENT
When Connecting Refrigerant Tubing
• When performing piping work do
not mix air except for specifIed
refrigerant (R410A) in refrigeration
cycle. It causes capacity down, and
risk of explosion and injury due to
WARNING
high tension inside the refrigerant
cycle.
• Refrigerant gas leakage may cause
fire.
• Ventilate the room well, in the event that is refrigerant
gas leaks during the installation. Be careful not to allow
contact of the refrigerant gas with a flame as this will
cause the generation of poisonous gas.
• Keep all tubing runs as short as possible.
• Use the flare method for connecting tubing.
• Apply refrigerant lubricant to the matching surfaces
of the flare and union tubes before connecting them,
then tighten the nut with a torque wrench for a leak-free
connection.
• Check carefully for leaks before starting the test run.
• Do not leak refrigerant while piping work for an
installation or re-installation, and while repairing
refrigeration parts.
Handle liquid refrigerant carefully as it may cause
frostbite.
When Servicing
• Turn the power OFF at the main power box
(mains) before opening the unit to check or repair
electrical parts and wiring.
• Keep your fingers and clothing away from any moving
parts.
• Clean up the site after you finish, remembering to
check that no metal scraps or bits of wiring have been
left inside the unit being serviced.
• Do not clean inside the indoor and
outdoor units by users. Engage
WARNING
authorized dealer or specialist for
cleaning.
• In case of malfunction of this
appliance, do not repair by yourself.
Contact to the sales dealer or service
dealer for a repair.
• Do not touch the air inlet or the
sharp aluminum fins of the
CAUTION
outdoor unit. You may get hurt.
• Ventilate any enclosed areas when
installing or testing the refrigeration
system. Escaped refrigerant gas, on
contact with fire or heat, can produce
dangerously toxic gas.
• Confirm after installation that no
refrigerant gas is leaking. If the gas
comes in contact with a burning stove,
gas water heater, electric room heater
or other heat source, it can cause the
generation of poisonous gas.
Others
• Do not touch the air inlet or the
CAUTION
sharp aluminum fins of the
outdoor unit. You may hurt.
• Do not sit or step on the unit,
you may fall down accidentally.
• Do not stick any object into the
FAN CASE.
You may be injured and the
unit may be damaged.
3

Check of Density Limit

The room in which the air conditioner is to be installed
requires a design that in the event of refrigerant gas
leaking out, its density will not exceed a set limit.
The refrigerant (R410A), which is used in the air conditioner,
is safe, without the toxicity or combustibility of ammonia, and
is not restricted by laws imposed to protect the ozone layer.
However, since it contains more than air, it poses the risk of
suffocation if its density should rise excessively. Suffocation
from leakage of refrigerant is almost non-existent. With the
recent increase in the number of high density buildings,
however, the installation of multi air conditioner systems is
on the increase because of the need for effective use of floor
space, individual control, energy conservation by curtailing heat
and carrying power, etc.
Most importantly, the multi air conditioner system is able
to replenish a large amount of refrigerant compared to
conventional individual air conditioners. If a single unit of the
multi air conditioner system is to be installed in a small room,
select a suitable model and installation procedure so that if the
refrigerant accidentally leaks out, its density does not reach the
limit (and in the event of an emergency, measures can be made
before injury can occur).
In a room where the density may exceed the limit, create an
opening with adjacent rooms, or install mechanical ventilation
combined with a gas leak detection device. The density is as
given below.
Total amount of refrigerant (kg)
3
Min. volume of the indoor unit installed room (m )
3
< Density limit (kg/m )
The density limit of refrigerant which is used in multi air
3
conditioners is 0.3 kg/m (ISO 5149).
NOTE
1. If there are 2 or more refrigerating systems in a single
refrigerating device, the amount of refrigerant should be as
charged in each independent device.
For the amount of charge in this example:
Outdoor unit
e.g., charged
amount (10 kg)
e.g., charged
amount (15 kg)
Indoor unit
Room A Room B Room C Room D Room E Room F
The possible amount of leaked refrigerant gas in rooms A,
B and C is 10 kg.
The possible amount of leaked refrigerant gas in rooms D,
E and F is 15 kg.
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).
Outdoor unit
Refrigerant tubing
Indoor unit
(3) If an indoor unit is installed in each partitioned room and
the refrigerant tubing is interconnected, the smallest room
of course becomes the object. But when 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.
Refrigerant tubing
Outdoor unit
Very
small
Indoor unit
room
Small Medium Large room
room
room
Mechanical ventilation device – Gas leak detector
3. The minimum indoor floor space compared with the
amount of refrigerant is roughly as follows: (When the
ceiling is 2.7 m high)
m 2 m 3
125 337.5
120 324.0
115 310.5
110 297.0
105 283.5
100 270.0
95 256.0
90 243.0
Range below the
85 229.5
density limit of
80 216.0
0.3 kg/m³
75 202.5
(Countermeasures
70 189.0
not needed)
65 175.5
60 162.0
55 148.5
50 135.0 Range above the
density limit of 0.3
45 121.5
kg/m³
40 108.0
(Countermeasures
35 94.5
needed)
30 81.0
25 67.5
20 54.0
15 40.5
10 27.0
5 13.5
0 0.0
0 10 20 30 40 50 60 70 80 90 100
Total amount of refrigerant
4
kg