Carrier 38VMA Series - Combination Table; Refrigerant Charge Calculation

5. Combination Table
6. Refrigerant Charge Calculation
Based on the field installed refrigerant pipe and system layout, additional refrigerant charge may be required. Add additional
refrigerant based on the calculation below.
Figure 16 - Calculating Refrigerant Charge
R* Amount of additional refrigerant to be charged.
Capacity (Ton)
Standard combination
Maximum Quantity of Connectable
Indoor Units
Model (208/230V-3Ph-60Hz) Model (460V-3Ph-60Hz) Combination type
6 38VMA072HDS5-1 38VMA072HDS6-1 6 13
8 38VMA096HDS5-1 38VMA096HDS6-1 8 16
10 38VMA120HDS5-1 38VMA120HDS6-1 10 20
12 38VMA144HDS5-1 38VMA144HDS6-1 12 26
14 38VMA168HDS5-1 38VMA168HDS6-1 6 + 8 29
16 38VMA192HDS5-1 38VMA192HDS6-1 8 + 8 33
18 38VMA216HDS5-1 38VMA216HDS6-1 8 + 10 36
20 38VMA240HDS5-1 38VMA240HDS6-1 10 + 10 39
22 38VMA264HDS5-1 38VMA264HDS6-1 12 + 10 46
24 38VMA288HDS5-1 38VMA288HDS6-1 12 + 12 50
26 38VMA312HDS5-1 38VMA312HDS6-1 10 + 8 + 8 53
28 38VMA336HDS5-1 38VMA336HDS6-1 10 + 10 + 8 56
30 38VMA360HDS5-1 38VMA360HDS6-1 10 + 10 + 10 59
32 38VMA384HDS5-1 38VMA384HDS6-1 12 + 10 + 10 63
34 38VMA408HDS5-1 38VMA408HDS6-1 12 + 12 + 10 64
36 38VMA432HDS5-1 38VMA432HDS6-1 12 + 12 + 12 64
+ +
Total length of liquid pipe size
at 7/8 in.
(ft) × 0.255 (lbs/ft)
Total length of liquid pipe size
at 3/4 in.
(ft) × 0.181 (lbs/ft)
Total length of liquid pipe size
at 5/8 in.
(ft) × 0.120 (lbs/ft)
+ +
Total length of liquid pipe size
at 1/2 in.
(ft) × 0.080 (lbs/ft)
Total length of liquid pipe size
at 3/8 in.
(ft) × 0.040 (lbs/ft)
Total length of liquid pipe size
at 1/4 in.
(ft) × 0.015 (lbs/ft)
+
R*=
+
Number of Y-joints
Equivalent pipe length of 1.6 ft.
7