Design of 3WAY VRF SYSTEM
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1. Model Selecting and Capacity Calculator
Refrigerant Charge Amount at Shipment (for outdoor unit)
U-72MF1U9 U-96MF1U9
DC
U-72MF1U9E U-96MF1U9E
(oz)
416 416
System Limitations
Max. No. allowable connected outdoor units
3
*1
Max. capacity allowable connected outdoor units
288,000 BTU/h (24-Ton, 84 kW)
Max. connectable indoor units
40
Max. allowable indoor/outdoor capacity ratio
50 – 130 %
*1: Up to 3 units can be connected if the system has been extended.
Additional Refrigerant Charge
Additional refrigerant charge amount is calculated from the liquid tubing total length as follows.
Amount of Refrigerant Charge Per ft., According to Liquid Tubing Size
Liquid tubing size
Amount of refrigerant
(in. (mm))
charge (oz/ft.)
ø1/4"
(ø6.35)
0.279
ø3/8"
(ø9.52)
0.602
ø1/2"
(ø12.7)
1.38
ø5/8"
(ø15.88)
1.99
ø3/4"
(ø19.05)
2.78
ø7/8"
(ø22.22)
3.93
Required amount of additional refrigerant charge = [(Amount of
additional refrigerant charge per ft. of each size of liquid tube ×
its tube length) + (...) + (...)] + [Necessary amount of additional
refrigerant charge per outdoor unit + (...) + (...)]
* Always charge accurately using a scale for weighing.
Table 2-1-1 Necessary Amount of Refrigerant Charge Per Outdoor Unit
U-72MF1U9
U-72MF1U9E
U-96MF1U9
U-96MF1U9E
42 oz/unit
42 oz/unit
TD831158-00̲3WAY̲VRF̲SYS.indb 5
TD831158-00̲3WAY̲VRF̲SYS.indb 5
2012/01/23 17:30:11
2012/01/23 17:30:11
Summary of Contents for U-72MF1U9
Page 118: ...Section 8 TENTATIVE ...