Panasonic U-4LE1E5 / U-4LE1E8 / U-5LE1E5 / U-5LE1E8 / U-6LE1E5 / U-6LE1E8 (serv.man2) Service Manual ▷ View online
2 - 11
1
2
3
4
5
6
7
8
9
Design of Mini VRF SYSTEM
1. Model Selecting and Capacity Calculator
Graph of indoor unit capacity characteristics (2 – (2))
Graph of capacity change characteristics resulting from tubing length and elevation difference (1 / 2 – (3))
<Cooling>
Elevation difference (m)
Elevation difference (m)
Base capacity
change rate
change rate
%
Equivalent length (m)
Equivalent length (m)
<Heating>
Base capacity
change rate
change rate
0
100
78
76
92
94
96
98
100
90
88
86
84
82
80
120 130 140
110
90
80
70
60
50
40
30
20
10
0
-10
-20
-30
-40
10
20
30
40
50
130
120
110
100
140
10
20
30
40
50
60
93
94
95
96
97
92
70
80
90
-10
-20
-30
-40
0
10
20
30
40
50
0
(Performance correction coefficients by elevation difference of refrigerant tube length [performance change rate ÷ 100] is
calculated by the following line map.)
Rate of cooling capacity change (%)
Indoor unit cooling capacity characteristics
Indoor unit heating capacity characteristics
indicates the rating point.
indicates the rating point.
Indoor air intake temp. (˚C WB)
140
130
120
110
100
60
70
80
90
15
14
25
24
23
22
21
20
19
18
17
16
Rate of heating capacity change (%)
Indoor air intake temp. (˚C DB)
120
115
110
105
100
70
65
60
27
28
29
30
26
25
24
23
22
21
20
19
18
17
16
75
80
85
90
95
%
100
98
99
TD831155-04_MINI VRF.indb 11
TD831155-04_MINI VRF.indb 11
2014/05/09 15:29:02
2014/05/09 15:29:02
2 - 12
1
2
3
4
5
6
7
8
9
Design of Mini VRF SYSTEM
1. Model Selecting and Capacity Calculator
For 4hp, 5hp units
Increasing the tubing size of the gas tubes can reduce the loss of capacity caused by longer tubing lengths.
Refer to Table 1-11 to increase the tubing size. However, the maximum allowable tubing length must not be
exceeded.
exceeded.
* The size increase is applied to the LA gas tube (main tube) only, and is limited to the cases shown in Table 1-11.
In addition, the amount of additional refrigerant charge is determined from the liquid tube size only.
* In case of 6HP, increasing the size of the gas tube is not possible.
Table 1-11 Correction coefficient for equivalent length when the size of the gas tube (LA) is increased
Standard tube diameter (gas tube, mm)
ø15.88
Tube diameter after change (gas tube, mm)
ø19.05
Equivalent length correction coeffi cient
0.4
* When increasing the size of the gas tubing (LA), multiply by the correction coefficient from Table 1-11 and calcu-
late the equivalent length for section LA.
Tubing equivalent length after size increase = Standard tubing equivalent length × Equivalent length correction coeffi cient
The upper limit for tubing size is ø19.05. Tubing above that size cannot be used.
WARNING
TD831155-04_MINI VRF.indb 12
TD831155-04_MINI VRF.indb 12
2014/05/09 15:29:02
2014/05/09 15:29:02
2 - 13
1
2
3
4
5
6
7
8
9
Design of Mini VRF SYSTEM
2. System Design
2-1. System Example
(1) Below are the tables created using “System Diagram Software.” Details of the calculations are shown in (2).
10 m
10 m
10 m
10 m
15 m
20 m
20 m
Selection conditions
Assumes that installation is in a 50 Hz region.
Assumes that installation is in a 50 Hz region.
Outdoor unit
Room 1
(indoor unit 1)
Room 2
(indoor unit 2)
Room 3
(indoor unit 3)
Room 4
(indoor unit 4)
Cooling
Air condition
(DB/WB)
(DB/WB)
33.0 / 22.5
26.0 / 18.0
26.0 / 18.0
26.0 / 18.0
26.0 / 18.0
5.3
2.1
2.4
2.3
5.6
3.0
3.0
2.9
Max. load (kW)
—
Heating
Air condition
(DB/WB)
(DB/WB)
3.0 / 2.0
21.0 / 16.0
25 m
35 m
55 m
65 m
21.0 / 16.0
21.0 / 16.0
21.0 / 16.0
Max. load (kW)
—
Actual tubing length
Equivalent length (with
consideration for curves,etc.)
Equivalent length (with
consideration for curves,etc.)
78 m
30 m
42 m
66 m
78 m
Type 73
Type 28
Type 28
Type 28
U-5LE1E5
14.0 / 16.0
7.3 / 8.0
2.8 / 3.2
2.8 / 3.2
2.8 / 3.2
14.4 / 16.4
6.5 / 7.3
2.5 / 2.9
2.3 / 2.9
2.3 / 2.8
6.5 / 7.3
2.5 / 2.9
2.3 / 2.9
2.3 / 2.8
5.3 / 5.6
2.1 / 3.0
2.4 / 3.0
2.3 / 2.9
Indoor unit changes
Increase by one rank because the capacity of the indoor unit 1 is lower than the maximum load.
Outdoor unit
Room 1
(indoor unit 1)
Room 2
(indoor unit 2)
Room 3
(indoor unit 3)
Room 4
(indoor unit 4)
Selected model
Load (cooling/heating) (kW)
—
Rated capacity
(cooling/heating) (kW)
Corrected capacity
(cooling/heating) (kW)
Actual capacity
(cooling/heating) (kW)
(cooling/heating) (kW)
Corrected capacity
(cooling/heating) (kW)
Actual capacity
(cooling/heating) (kW)
—
Outdoor
unit
Indoor
unit 1
Indoor
unit 2
Indoor
unit 3
Indoor
unit 4
Elevation
difference: 10 m
difference: 10 m
Type 56
Type 28
Type 28
Type 28
U-5LE1E5
14.0 / 16.0
5.4 / 5.6
2.8 / 3.2
2.8 / 3.2
2.8 / 3.2
5.1 / 6.0
2.5 / 3.0
2.4 / 3.0
2.3 / 2.9
5.1 / 6.0
2.5 / 3.0
2.4 / 3.0
2.3 / 2.9
13.1 / 15.3
5.3 / 5.6
2.1 / 3.0
2.4 / 3.0
2.3 / 2.9
Preliminary selection
Outdoor unit
Room 1
(indoor unit 1)
Room 2
(indoor unit 2)
Room 3
(indoor unit 3)
Room 4
(indoor unit 4)
Selected model
Load (cooling/heating) (kW)
—
Rated capacity
(cooling/heating) (kW)
Corrected capacity
(cooling/heating) (kW)
(cooling/heating) (kW)
Corrected capacity
(cooling/heating) (kW)
Actual capacity
(cooling/heating) (kW)
(cooling/heating) (kW)
—
TD831155-04_MINI VRF.indb 13
TD831155-04_MINI VRF.indb 13
2014/05/09 15:29:02
2014/05/09 15:29:02
2 - 14
1
2
3
4
5
6
7
8
9
Design of Mini VRF SYSTEM
2. System Design
Outdoor unit changes
The capacity of the indoor units 2 and 3 is lower than the maximum load.
The capacity of the indoor units 2 and 3 is lower than the maximum load.
Outdoor unit
Room 1
(indoor unit 1)
Room 2
(indoor unit 2)
Room 3
(indoor unit 3)
Room 4
(indoor unit 4)
Type 73
Type 28
Type 28
Type 28
U-6LE1E5
Selected model
Load (cooling / heating) (kW)
—
5.3 / 5.6
2.1 / 3.0
2.4 / 3.0
2.3 / 2.9
Rated capacity
(cooling/heating) (kW)
(cooling/heating) (kW)
15.5 / 18.0
14.7 / 17.0
7.3 / 8.0
6.7 / 7.6
2.8 / 3.2
2.5 / 3.0
2.8 / 3.2
2.4 / 3.0
6.7 / 7.6
2.5 / 3.0
2.4 / 3.0
2.8 / 3.2
2.3 / 2.9
2.3 / 2.9
Corrected capacity
(cooling/heating) (kW)
Actual capacity
(cooling/heating) (kW)
(cooling/heating) (kW)
Actual capacity
(cooling/heating) (kW)
—
TD831155-04_MINI VRF.indb 14
TD831155-04_MINI VRF.indb 14
2014/05/09 15:29:03
2014/05/09 15:29:03
Click on the first or last page to see other U-4LE1E5 / U-4LE1E8 / U-5LE1E5 / U-5LE1E8 / U-6LE1E5 / U-6LE1E8 (serv.man2) service manuals if exist.