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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).
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
6
8
10
Lbs
3.3
3.7
5.1
12
14
16
18
6.6
7.1
7.5
8.8
10.1 13.2 14.1 15.0 19.8 20.3 20.7
20
24
28
32
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36
38
40
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