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7-3. Charging requirement with additional refrigerant
Additional refrigerant charge amount (case of SMMS-u)
This item describes the refrigerant correction amount of the Dx coil Interface system when connects with SMMS-u.
For more information please refer to Engineering Databook of SMMS-u.
Additional refrigerant charge amount at site = [1] + [2] + [3] + [4]
[1]. Compensation by system Ton.
[2]. Real length of liquid pipe × Additional refrigerant charge amount per liquid pipe 1 ft.
[3]. Corrective amount of refrigerant depending on the indoor units(Dx-coil interface capacity). Please refer to
table below.
For Guideline TF, Dx-coil volume is relatively small. Hence, the additional refrigerant correction amount shall
be 0 lbs for all cases.
[4]. Corrective amount of refrigerant depending on the outdoor unit diversity (Connected ratio of indoor units to
outdoor units).
Corrective amount of refrigerant depending on the Dx-coil interface capacity (Ton). Guideline HP, cooling only pattern
A and B.
Ton
0.6
0.8
1
1.25
Lbs
0.24 0.32 0.42 0.60 0.72 0.92 1.12 1.20 1.51 1.91 2.11
Ton
6
8
10
12
Lbs
3.09 3.97 4.68 6.26 7.06 7.85 8.84 9.83 11.8 12.6 13.4 14.2 15.0 15.8 17.3 18.1 18.9
1.5
2
2.25
2.5
3
14
16
18
20
22
– 26 –
4
4.5
5
2.5
24
26
28
30
32
36
38
40
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