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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
TD831155-04_MINI VRF.indb 6
TD831155-04_MINI VRF.indb 6
2014/05/09 15:29:01
2014/05/09 15:29:01
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