Combination Table; Refrigerant Charge Calculation - Carrier 38VMA Series Service Manual

5. Combination Table

Capacity (Ton)
Model (208/230V-3Ph-60Hz)
6 38VMA072HDS5-1
8 38VMA096HDS5-1
10 38VMA120HDS5-1
12 38VMA144HDS5-1
14 38VMA168HDS5-1
16 38VMA192HDS5-1
18 38VMA216HDS5-1
20 38VMA240HDS5-1
22 38VMA264HDS5-1
24 38VMA288HDS5-1
26 38VMA312HDS5-1
28 38VMA336HDS5-1
30 38VMA360HDS5-1
32 38VMA384HDS5-1
34 38VMA408HDS5-1
36 38VMA432HDS5-1

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.
Total length of liquid pipe size
at 7/8 in.
R*=
(ft) × 0.255 (lbs/ft)
Total length of liquid pipe size
at 1/2 in.
+
(ft) × 0.080 (lbs/ft)
Number of Y-joints
+
Equivalent pipe length of 1.6 ft.
R* Amount of additional refrigerant to be charged.
Standard combination
Model (460V-3Ph-60Hz)
38VMA072HDS6-1
38VMA096HDS6-1
38VMA120HDS6-1
38VMA144HDS6-1
38VMA168HDS6-1
38VMA192HDS6-1
38VMA216HDS6-1
38VMA240HDS6-1
38VMA264HDS6-1
38VMA288HDS6-1
38VMA312HDS6-1
38VMA336HDS6-1
38VMA360HDS6-1
38VMA384HDS6-1
38VMA408HDS6-1
38VMA432HDS6-1
Total length of liquid pipe size
+ at 3/4 in.
(ft) × 0.181 (lbs/ft)
Total length of liquid pipe size
at 3/8 in.
+
(ft) × 0.040 (lbs/ft)
Figure 16 - Calculating Refrigerant Charge
Maximum Quantity of Connectable
Combination type
6
8
10
12
6 + 8
8 + 8
8 + 10
10 + 10
12 + 10
12 + 12
10 + 8 + 8
10 + 10 + 8
10 + 10 + 10
12 + 10 + 10
12 + 12 + 10
12 + 12 + 12
Total length of liquid pipe size
+ at 5/8 in.
(ft) × 0.120 (lbs/ft)
Total length of liquid pipe size
at 1/4 in.
+
(ft) × 0.015 (lbs/ft)
Indoor Units
13
16
20
26
29
33
36
39
46
50
53
56
59
63
64
64
7