Panasonic U-72MF2U9 Technical Data Manual page 26

1. Model Selecting and Capacity Calculator
1. Model Selection and Capacity Calculator
Table 10 Necessary Amount of Additional Refrigerant Charge Per Outdoor Unit
Further charge a certain amount listed below in addition to the amount of refrigerant charge.
Combination number of outdoor unit
Additional amount
Necessary Amount of Additional Refrigerant Charge for All Indoor Unit Cooling Capacity
Charge a refrigerant amount calculated in the following formula according to the total amount of indoor unit cooling capacity.
Additional refrigerant amount when cooling capacity is BTU/h = Cooling capacity (BTU/h) × 1.034 × 0.001 + 10.6 (oz)
or Additional refrigerant amount when cooling capacity is kW = Cooling capacity (kW) × 1000 × 0.1 + 300 (g)
Table 11 Necessary Amount of Additional Refrigerant Charge Per ft. (or per meter), According to Discharge Tubing Size
Discharge tubing size
1
Additional amount
* Additional refrigerant charge amount of discharge tubing should be less than 317 oz (9,000g).
2
1-7. System Limitations
Table 12 System Limitations
Max. No. allowable connected outdoor units
Max. capacity allowable connected outdoor
units
3
Max. connectable indoor units
Max. allowable indoor/outdoor capacity ratio
*1: In the case of 20 ton (70.3kW) 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
4
can become between 50 and 130%.
Table 13 System Limitations of Total Refrigerant Amount
Combination number of outdoor unit
Upper limit
Make sure the values calculated using the following formula should not exceed the maximum allowable values (Table 13).
5
Total refrigerant amount = Refrigerant charge amount at shipment (for outdoor unit)
6
7
8
9
1
oz (g) 70.5 (2,000)
inch ø1/2"
(mm) (ø12.7)
oz/ft. 0.129
(g/m) (12)
3 *
360,000 BTU/h
(30 ton, 105.5 kW)
52 *
50 – 150 %
1
oz (g) 1,763 (50,000)
+ Necessary amount of additional refrigerant charge per ft. (or per meter) according to liquid tubing size
+ Necessary amount of additional refrigerant charge per outdoor unit
+ Necessary amount of additional refrigerant charge for all indoor unit cooling capacity
+ Necessary amount of additional refrigerant charge per ft. (or per meter) according to discharge tubing size
2
141.0 (4,000) 212 (6,000)
ø5/8" ø3/4"
(ø15.88) (ø19.05)
0.226 0.333
(21) (31)
Maximum number of connectable indoor units
when connected with minimum capacity
2
Total system
tonnage
6
1
8
*
3
10
12
14
2 3
2,821 (80,000) 3,703 (105,000)
2 - 10
Design of 3WAY VRF SYSTEM
Design of 3WAY VRF SYSTEM
3
ø7/8" ø1-1/8"
(ø22.22) (ø28.58)
0.441 0.763
(41) (71)
Number of Total system Number of
indoor units tonnage indoor units
14 16
19 18
24 20
28 22~30
33
ø1-3/8"
(ø34.92)
1.118
(104)
38
43
48
52