Panasonic U-8ME1E8 Mode D'emploi page 8

SUPPLEMENT
1-7. Straight Equivalent Length of Joints
Design the tubing system by referring to the following table for the straight equivalent length of joints.
Table 1-7 Straight Equivalent Length of Joints
Gas tubing size (mm) 12.7
90° elbow 0.30
45° elbow 0.23
U-shape tube bent (R60-100 mm) 0.90
Trap bend 2.30
Y-branch distribution joint
Ball valve for service
Table 1-8 Refrigerant tubing (Existing tubing can be used.)
Tubing size (mm)
Material O Material 1/2H • H
ø6.35 t0.8 ø22.22 t1.0
ø9.52 t0.8 ø25.4 t1.0
ø12.7 t0.8 ø28.58 t1.0
ø15.88 t1.0 ø31.75 t1.1
ø19.05 t1.2 ø38.1 over t1.35
ø41.28 over t1.45
1-8. Additional Refrigerant Charge
Additional refrigerant charge amount is calculated below.
Required amount of additional refrigerant charge = [ (Amount of additional refrigerant charge per meter of each size of liquid tube x
its tube length) + (...) + (...)] + [(Necessary amount of additional refrigerant charge per outdoor unit) + (...) + (...)]
*Always charge accurately using a scale for weighing.
* If the existing tubing is used and the amount of on-site refrigerant charge exceeds the value listed below, change the size of the tubing
to reduce the amount of refrigerant.
Total amount of refrigerant for the system with 1 outdoor unit: 50 kg
Total amount of refrigerant for the system with 2 outdoor units: 80 kg
Total amount of refrigerant for the system with 3 outdoor units: 100 kg
Table 1-9-1 Amount of Additional Refrigerant Charge Per Meter, According to Liquid Tubing Size
Liquid tubing size 6.35 9.52 12.7 15.88
Amount of additional
26 56 128 185
refrigerant charge/m (g/m)
Table 1-9-2 Necessary Amount of Additional Refrigerant Charge Per Outdoor Unit
U-8ME1E8(E) U-10ME1E8(E) U-12ME1E8(E) U-14ME1E8(E)
2.5 kg 3.5 kg 3.5 kg 6.4 kg
Table 1-10 Refrigerant Charge Amount at Shipment (for Outdoor Unit)
U-8ME1E8(E) U-10ME1E8(E) U-12ME1E8(E) U-14ME1E8(E)
9.9 kg 9.9 kg 9.9 kg 9.9 kg
1-9. System Limitations
Table 1-11 System Limitations
Max. No. allowable connected outdoor units 3 *
Max. capacity allowable connected outdoor units 168 kW (60 hp)
Max. connectable indoor units 64 *
Max. allowable indoor/outdoor capacity ratio 50 – 200 % *
*1: In the case of 22 hp (type 61.5 kW) or smaller units, the number is limited by the total capacity of the connected indoor units.
*2: Up to 3 units can be connected if the system has been extended.
*3: It is strongly recommended that you choose the unit so the load can become between 50 and 130%.
15.88 19.05 22.22 25.4 28.58 31.8 38.1
0.35 0.42 0.48 0.52 0.57 0.70 0.79
0.26 0.32 0.36 0.39 0.43 0.53 0.59
1.05 1.26 1.44 1.56 1.71 2.10 2.37
2.80 3.20 3.80 4.30 4.70 5.00 5.80
Equivalent length conversion not needed.
Equivalent length conversion not needed.
* When bending the tubes, use a bending
radius that is at least 4 times the outer
diameter of the tubes.
In addition, take sufficient care to avoid
crushing or damaging the tubes when
bending them.
19.05 22.22 25.4
259 366 490
U-16ME1E8(E) U-18ME1E8(E) U-20ME1E8(E)
6.4 kg 7.6 kg 7.6 kg
U-16ME1E8(E) U-18ME1E8(E) U-20ME1E8(E)
9.9 kg 9.9 kg 9.9 kg
2
1
3
11
Always check the gas density
WARNING
limit for the room in which the
unit is installed.
1-10. Check of Limit Density
When installing an air conditioner in a room, it is necessary to
ensure that even if the refrigerant gas accidentally leaks out, its
density does not exceed the limit level for that room.
If the density could exceed the limit level, it is necessary to
provide an opening between the unit and the adjacent room, or
to install mechanical ventilation which is interlocked with a leak
detector.
(Total refrigerant charged amount: kg)
(Min. indoor volume where the indoor unit is installed: m³)
Limit density 0.3 (kg/m³)
The limit density of refrigerant R410A which is used in this unit
is 0.3 kg/m³ (ISO 5149).
The shipped outdoor unit comes charged with the amount of
refrigerant fi xed for each type, so add it to the amount that
is charged in the fi eld. (For the refrigerant charge amount at
shipment, refer to the unit's nameplate.)
Minimum indoor volume & fl oor area as against the amount of
refrigerant is roughly as given in the following table.
2 3
m m
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
Range above the
50 135.0
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
Pay special attention to any
location, such as a basement,
CAUTION
etc., where leaking refrigerant
can accumulate, since refrigerant
gas is heavier than air.
1-11. Installing Distribution Joint
(1) Refer to "HOW TO ATTACH DISTRIBUTION JOINT"
enclosed with the optional distribution joint kit
(CZ-P680PJ2, CZ-P1350PJ2, CZ-P160BK2, CZ-P680BK2,
CZ-P1350BK2).
(2) When creating a branch using a commercially available
T-joint (header joint system), orient the main tubing so that
it is either horizontal (level) or vertical. In order to prevent
accumulation of refrigerant oil in stopped units, if the main
tubing is horizontal then each branch tubing length should be
at an angle that is greater than horizontal. If the main tubing
is vertical, provide a raised starting portion for each branch.
[Header joint system]
● Be sure to solidly weld shut the T-joint end (marked by "X" in
the figure). In addition, pay attention to the insertion depth of
each connected tube so that the flow of refrigerant within the
T-joint is not impeded.
● When using the header joint system, do not make further
branches in the tubing.
● Do not use the header joint system on the outdoor unit side.
(3) If there are height differences between indoor units or if
branch tubing that follows a distribution joint is connected
to only 1 unit, a trap or ball valve must be added to that
distribution joint. (When adding the ball valve, locate it within
40 cm of the distribution joint.)
If a trap or ball valve is not added, do not operate the
system before repairs to a malfunctioning unit are
completed. (The refrigerant oil sent through the tubing
to the malfunctioning unit will accumulate and may
damage the compressor.)
B
A
A Horizontal
B
line View as seen
from arrow
Arrow view
Header joint system (Indoor)
Install at a
positive angle
Outdoor
Indoor
Install at a
Indoor positive angle
(15 – 30°)
Horizontal
line
Indoor
L3 < 2 m
Horizontal Solidly welded
line
shut (X)
Types of vertical trap specifications
(When using ball valve)
Main tubing
Ball valve
(BV: purchased
kg
Indoor unit (more than 2 units)
separately)
(If only 1 unit is connected, a ball valve
is also needed on this side.)
Indoor unit (1)
(When not using ball valve)
Main tubing
Horizontal (Each unit is connected
Indoor unit to tubing that is either
level or is directed
Branch tubing is
downward.)
directed upward.
More than
20 cm
Indoor unit is directed downward
12