Design of 3WAY VRF SYSTEM
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1. Model Selection and Capacity Calculator
Design of 3WAY VRF SYSTEM
1. Model Selecting 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 123
Additional amount oz (
g
)70.5 (2,000)141.0 (4,000) 212 (6,000)
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
1-7. System Limitations
Table 12 System Limitations
Max. No. allowable connected outdoor units3 *
2
Max. capacity allowable connected outdoor
units
360,000 BTU/h
(30 ton, 105.5 kW)
Max. connectable indoor units52 *
1
*
3
Max. allowable indoor/outdoor capacity ratio50 – 150 %
*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
can become between 50 and 130%.
Table 13 System Limitations of Total Refrigerant Amount
Combination number of outdoor unit 123
Upper limit oz (
g
)1,763 (50,000) 2,821 (80,000) 3,703 (105,000)
Make sure the values calculated using the following formula should not exceed the maximum allowable values (Table 13).
To tal refrigerant amount = Refrigerant charge amount at shipment (for outdoor unit)
+
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
Maximum number of connectable indoor units
when connected with minimum capacity
7'B⡿ྥࡅ:$<LQGE
Discharge tubing size
inch ø1/2" ø5/8" ø3/4"ø7/8"ø1-1/8" ø1-3/8"
(mm) (ø12.7)(ø15.88)(ø19.05)(ø22.22)(ø28.58)(ø34.92)
Additional amount
oz/ft. 0.129 0.226 0.3330.441 0.7631.118
(
g
/m)(12)(21)(31) (41) (71) (104)
To tal system
tonnage
Number of
indoor units
To tal system
tonnage
Number of
indoor units
6141638
8191843
10 24 20 48
12 28 22~30 52
14 33
*
Additional refrigerant charge amount of discharge tubing should be less than 317 oz
(9,000
g
).
TD831183-00_北米向け3WAY.indb 10 15/12/17 16:05:08
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