U-50PE2E5A, U-100PE1E8A, U-100PEY1E8, U-125PE1E8A, U-125PEY1E8, U-140PE1E8A, U-140PEY1E8, S-100PU2E5B, S-125PU2E5B, S-140PU2E5B, S-71PU2E5B, S-100PF1E5B, S-125PF1E5B, S-140PF1E5B, S-71PF1E5B — Panasonic Air Conditioner Service Manual (repair manual). Page 7

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(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.
2.  The minimum indoor floor space compared with the 
amount of refrigerant is roughly as follows: (When the 
ceiling is 2.7 m high)
20
10
0
30
40
60
70
80
90 100
50
m
2
m
3
40.5
54.0
27.0
13.5
0.0
67.5
81.0
94.5
108.0
121.5
135.0
148.5
162.0
175.5
189.0
202.5
216.0
15
10
5
0
20
25
30
35
40
45
50
55
60
65
70
75
80
229.5
85
kg
 
Total amount of refrigerant
Range below the 
density limit of  
0.44 
kg/m³
(Countermeasures 
not needed)
Range above the 
density limit of 
0.44 
kg/m³
(Countermeasures 
needed)
Min. indoor volume
Min. indoor floor area (when the ceiling is 2.7 m high)
Check of Density Limit
Check the amount of refrigerant in the system and 
floor space of the room according to the legislation on 
refrigerant drainage. If there is no applicable legislation, 
follow the standards described below.
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)
Min. volume of the indoor unit installed room (m
3
< Density limit (
kg/m
3
)
The density limit of refrigerant which is used in multi air 
conditioners is 0.44 
kg/m
3
 (ISO 5149).
NOTE
1.  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
Mechanical ventilation device – Gas leak detector
Refrigerant tubing
Outdoor unit
Indoor unit
Very 
small 
room
Small 
room
Medium 
room
Large room
01_2812008_2WAY_eng.indb   5
2016/11/28   13:03:48
Precautions for Installation Using New Refrigerant
1. Care regarding tubing
  Material: Use seamless phosphorous deoxidized copper tube for refrigeration. Wall thickness shall comply with the applicable
legislation. The minimal wall thickness must be in accordance with the table below.
1-1. Process tubing
1-2.
2-1.
3-1.
* Using tools for R22 and R407C and new tools for R410A together can cause defects.
2-2.
Since R410A is a non-azeotrope, recharging the refrigerant in gas form can lower performance and cause defects in the unit.
Since refrigerant composition changes and performance decreases when gas leaks, collect the remaining refrigerant and recharge
the required total amount of new refrigerant after fixing the leak.
Tool specifications have been changed due to the characteristics of R410A.
Some tools for R22- and R407C-type refrigerant systems cannot be used.
3-2. Use R410A exclusive cylinder only.
(with siphon tube)
Liquid refrigerant should be
recharged with the cylinder
standing on end as shown.
Prevent impurities including water, dust and oxide from entering the tubing. Impurities can cause R410A refrigerant deterioration
and compressor defects. Due to the features of the refrigerant and refrigerating machine oil, the prevention of water and other
impurities becomes more important than ever.
  Tubing size: Be sure to use the sizes indicated in the table below.
For the renewal tubing size, refer to the Technical Data.
When bending tubing, use a bending radius that is 4 times the outer diameter of the tubing or larger.
Use a tube cutter when cutting the tubing, and be sure to remove any flash. This also applies to distribution joints (optional).
 
Use sufficient care in handling the tubing. Seal the tubing ends with caps or tape to prevent dirt, 
moisture, or other foreign substances from entering. These substances can result in system 
malfunction.
Material
Temper - O (Soft copper tube)
2.  Be sure to recharge the refrigerant only in liquid form.
3.  Different tools required
Item
New tool?
R407C tools 
compatible 
with R410A?
Remarks
Manifold gauge 
Yes 
Manifold gauge
Types of refrigerant, refrigerating machine oil,
and pressure gauge are different.
To resist higher pressure, material must be
changed.
Use a conventional vacuum pump if it is equipped
with a check valve. If it has no check valve,
purchase and attach a vacuum pump adapter.
Leak detectors for CFC and HCFC that react to
chlorine do not function because R410A contains
no chlorine. Leak detectors for HFC134a can be
used for R410A.
For systems that use R22, apply mineral oil
(Suniso oil) to the flare nuts on the tubing to
prevent refrigerant leakage. For machines that
use R407C or R410A, apply synthetic oil (ether
oil) to the flare nuts.
Charge hose
Vacuum pump
Leak detector
Flaring oil
Outlet
Inlet
Valve
Yes
No
No
No
No
Yes
Yes
Yes 
Vacuum pump
Yes 
Single-outlet valve 
01_2812008_2WAY_eng.indb   6
2016/11/28   13:03:48
CAUTION
Unit: mm
Copper tube
Outer diameter
Wall thickness
6.35
9.52
12.7
15.88
0.8
0.8
0.8
1.0
Liquid
SM830274-02_欧州向けR410Aシングル_TD&SM.indb   6
2019/09/24   16:21:16
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