23
Mode Selection Box
Model
Amount of refrigerant
(lb/per)
Amount of refrigerant
(kg/per)
V8MSBB02-3P
2.20
1
V8MSBB04-3P
2.20
1
V8MSBB06-3P
2.20
1
V8MSBB08-3P
4.41
2
V8MSBB10-3P
4.41
2
V8MSBB12-3P
4.41
2
Additional Refrigerant Charge
1. Refer to the LVSS Calculation and Selection
report for proper system additional refrigerant
charge amount.
2.
For manual calculations, calculate the additional
refrigerant charge using the diameter and length
of the liquid pipe (only) using Table 3.
3. Calculate the additional refrigerant charge per
outdoor unit using Table 4.
4. Calculate the additional refrigerant charge for
each liquid line branch pipe kit.
Total length (ft) of
liquid piping size
at Φ7/8
Total length (ft) of
liquid piping size
at Φ5/8
Total length (ft) of
liquid piping size
at Φ3/8
Total length (ft) of
liquid piping size
at Φ3/4
Total length (ft) of
liquid piping size
at Φ1/2
Total length (ft) of
liquid piping size
at Φ1/4
X 0.255 +
X 0.181
Liquid Line
Additional
Refrigerant
(lbs.)
+
+
(
(
(
(
(
(
X 0.120 +
X 0.080
(
(
(
(
X 0.040 +
X 0.015
(
(
=
5. Calculate the additional refrigerant charge for
each Mode Selection Box using Table 5.
6. If the ratio of VMDB or V33B Indoor unit
capacity exceeds 80% of all indoor units, use
Table 6 to determine the additional refrigerant
charge to add.
7. Total all calculations.
8.
Do no exceed the maximum allowed additional
refrigerant charge amount for the system. Table
7.
9. Add the calculated additional refrigerant to the
system.
Liquid Line Length Calculation
Calculate additional refrigerant charge using the diameter and length of the liquid pipe.
Table 3. Liquid Line Calculation
Mode Selection Box Calculation
Use Table 4 to determine the amount of additional refrigerant for EACH mode selection box.
Table 5. Mode Selection Box Additional Charge
Table 4. Outdoor Unit Additional Charge
Outdoor Unit Calculation
Calculate additional refrigerant charge per outdoor unit.
Model
lb
kg
6-10 Ton
6.39
2.9
12-16 Ton
15.87
7.2
Summary of Contents for VPB Series
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