Panasonic U-4LE1E5 / U-4LE1E8 / U-5LE1E5 / U-5LE1E8 / U-6LE1E5 / U-6LE1E8 (serv.man2) Service Manual ▷ View online
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Design of Mini VRF SYSTEM
1. Model Selecting and Capacity Calculator
Select the model and calculate the capacity for each refrigerant system according to the procedure shown below.
Calculation of the indoor air-conditioning load
Calculate the maximum air-conditioning load for each room or zone.
Selection of an air conditioning system
Select the ideal air conditioning system for air conditioning of each room or zone.
Design of the control system
Design a suitable control system for the selected air conditioning system.
Preliminary selection of indoor and outdoor units
Make preliminary selections that are within the allowable range for the system.
...........
2-4 ~ 2-7
Check of the tubing length and elevation difference
Check that the length of refrigerant tubing and the elevation difference are within the allowable
ranges................................................................................................................................... 2-6, 7
Calculation of the corrected outdoor unit capacity
Capacity correction coefficient for model.................................................................................. 2-8
Capacity correction coefficient for tubing length and elevation difference.............................. 2-11
Heating capacity correction coefficient for frosting/defrosting................................................. 2-10
Calculation of the corrected capacity for each indoor unit
Capacity correction coefficient for indoor temperature conditions............................................ 2-9
Capacity distribution ratio based on the tubing length and elevation difference.............2-9 ~ 2-11
Recheck of the actual capacity for each indoor unit
If the capacity is inadequate, reexamine the unit combinations.
Example 1: Increasing the outdoor unit capacity.....................................................................2-13
Increasing the tubing size......................................................................................................... 2-5
Design of tubing
Create a tubing design which minimizes the amount of additional refrigerant charge as much as
possible........................................................................................................................... 2-4 ~ 2-7
Select the tubing size for the main tube (LA) up to the No. 1 distribution joint based on the rated
cooling capacity of the outdoor unit. Select tubing sizes after the distribution point based on the
total rated cooling capacity of the connected indoor units.
Calculation of additional refrigerant charge amount
Calculate the additional refrigerant charge from the diameters and lengths of the refrigerant
tubing. ...................................................................................................................................... 2-6
Check the minimum indoor capacity (limit density) with respect to the amount of refrigerant. If the
limit density is exceeded, be sure to install ventilation equipment or take other corrective steps.... 2-7
Design of electrical wiring capacity
Select a wiring capacity according to the method of power supply......................................... 2-18
1-2. Procedure for Selecting Models and Calculating Capacity
Model Selection Procedure
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Design of Mini VRF SYSTEM
1. Model Selecting and Capacity Calculator
1-3. Tools Required for Installation (not supplied)
1.
2.
3.
4.
5.
6.
7.
8.
9.
Flathead screwdriver
Phillips head screwdriver
Knife or wire stripper
Tape measure
Level gauge
Sabre saw or key hole saw
Hacksaw
Core bits
Hammer
10.
11.
Drill
Tube cutter
Tube flaring tool
.
2
1
13.
14.
Torque wrench
Adjustable wrench
16.
17.
18.
Hexagonal wrench (4 mm and 5 mm)
Pliers
Cutting pliers
Reamer (for deburring)
15.
1-4. Accessories Supplied with Outdoor Unit
1-6. Additional Materials Required for Installation
1.
Refrigeration (armored) tape
2.
Insulated staples or clamps for connecting wire
(See your local codes.)
3.
Putty
4.
Refrigeration tubing lubricant
5.
Clamps or saddles to secure refrigerant tubing
6.
Scale for weighing
1-5. Type of Copper Tube and Insulation Material
If you wish to purchase these materials separately
from a local source, you will need:
1. Deoxidized annealed copper tube for refrigerant
tubing.
2. Foamed polyethylene insulation for copper tubes as
required to precise length of tubing. Wall thickness
of the insulation should be not less than 8 mm.
3. Use insulated copper wire for field wiring. Wire
size varies with the total length of wiring. Refer to
3. ELECTRICAL WIRING for details.
Check local electrical codes
and regulations before
obtaining wire. Also, check
any specified instructions
or limitations.
CAUTION
Table 1-1 Outdoor Unit
hp = horsepower
Part name
Figure
Q’ty
4 hp
5 hp
6 hp
Tube
Discharge
Assy
Discharge
Assy
Plastic bar
0
0
1
Instruction
manual
manual
paper
1
1
1
2
2
2
(L=115mm)
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Design of Mini VRF SYSTEM
1. Model Selecting and Capacity Calculator
1-7. Tubing Size
Table 1-2 Main Tubing Size (LA)
4 hp
5 hp
6 hp
System
horsepower
horsepower
4
5
6
Gas tubing
(mm)
(mm)
ø15.88
ø19.05
Liquid tubing
(mm)
(mm)
ø9.52
Table 1-3 Main Tubing Size After Distribution (LB, LC...)
Total capacity
after distribution
after distribution
Below kW
7.1
(2.5 hp)
12.1
(4 hp)
14.0
(5 hp)
15.5
(6 hp)
Over kW
—
7.1
(2.5 hp)
Tubing size
Gas tubing (mm)
ø12.7
ø15.88
ø19.05
Liquid tubing (mm)
ø9.52
ø9.52
Note: In case the total capacity of connected indoor units exceeds the total capacity of the outdoor units, select the main
tubing size for the total capacity of the outdoor units.
Table 1-4 Indoor Unit Tubing Connection (
1
,
2
...
n-1
)
Indoor unit type
22
28
36
45
56
73
90
106
140
160
Gas tubing
(mm)
ø12.7
ø15.88
Liquid tubing
(mm)
ø6.35
ø9.52
1-8. Straight Equivalent Length of Joints
Design the tubing system by referring to the following table for the straight equivalent length of joints.
Table 1-5 Straight Equivalent Length of Joints
Gas tubing size (mm)
12.7
15.88
19.05
90° elbow
0.30
0.35
0.42
45° elbow
0.23
0.26
0.32
U-shape tube bend (R60 – 100 mm)
0.90
1.05
1.26
Trap bend
2.30
2.80
3.20
Y-branch distribution joint
Equivalent length conversion not needed.
Equivalent length conversion not needed.
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Table 1-6 Required Copper Tubing Dimensions
Unit: mm
Material
O
Copper tubing
Outer diameter
6.35
9.52
12.7
15.88
19.05
Wall thickness
0.8
0.8
0.8
1.0
1.2
Unit: mm
Unit: mm
hp = horsepower
hp = horsepower
hp = horsepower
Unit: mm
Note :
If the system consists of only one indoor unit with an
outdoor 6HP, the main tube of the unit (LA) should be
ø19.05. Convert ø19.05 to ø15.88 using a reducer
(field supply) close to the indoor unit and then make the
connection.
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Design of Mini VRF SYSTEM
1. Model Selecting and Capacity Calculator
1-9. Additional Refrigerant Charge
Additional refrigerant charge amount is calculated from the liquid tubing total length as follows.
Table 1-7 Amount of Refrigerant Charge Per Meter, According to Liquid Tubing Size
Liquid tubing size
Amount of refrigerant charge/m (
g/m)
26
ø6.35
ø9.52
56
Table 1-8 Refrigerant Charge Amount at Shipment (for outdoor unit)
4 hp
5 hp
6 hp
4 hp
5 hp
6 hp
3.5 k
g
3.5 k
g
3.5 k
g
1-10. System Limitations
Table 1-9 System Limitations
Outdoor units
Number of max. connectable indoor units
6
8
9
Max. allowable indoor/outdoor capacity ratio
50 – 130%
1-11. Tubing Length
Select the installation location so that the length and size of refrigerant tubing are within the allowable range
shown in the figure below.
Neccessary amount of charge
= (Amount of refrigerant charge per meter of each size of liquid tube
= (Amount of refrigerant charge per meter of each size of liquid tube
×
+ (...) + (...)
its tube length)
*Always charge accurately using a scale for weighing.
Note : Do not use commercially available T-joints for the liquid tubing.
Be sure to use special R410A distribution joints (CZ-P160BK2: optional)
for outdoor unit connections and tubing branches.
for outdoor unit connections and tubing branches.
*
R410A distribution joint CZ-P160BK2 (for indoor unit)
hp = horsepower
hp = horsepower
Ball valve
(field supply)
(field supply)
Distribution joint
(CZ-P160BK2)
(CZ-P160BK2)
Main tube
of unit
of unit
1st branch
Unit distribution tube
For
extension
extension
Less than
400mm
400mm
H1
H2
LA
L1
L2
LD
LC
LB
L3
n
1
2
3
n-1
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