AAON CF Series - F & Superheat=10

30
The following table is available to help with estimating the initial charge to add based on
refrigerant line lengths, however, final refrigerant charge must be based on the sub-cooling and
superheat values as discussed in the prior section.
Table 10 - Estimated R410A Refrigerant Charge per 1.5 meters
Liquid
Line
(mm) od
Additional
R410A
charge per
1.5m of
line (oz)*
Suction
Line
(mm) od
Additional
R410A
charge per
1.5m of
line (oz)*
Reheat
Line
(mm) od
Additional
R410A
charge per
1.5m of
line (oz)*
Hot Gas
Bypass
Line
(mm) od
Additional
R410A
charge per
1.5m of
line (oz)*
9.5
2.58
9.5
0.1
9.5
0.24
9.5
0.17
12.7
5.08
12.7
0.19
12.7
0.48
12.7
0.34
15.9
8.23
15.9
0.31
15.9
0.77
15.9
0.55
19.1
11.85
19.1
0.44
19.1
1.12
19.1
0.8
22.2
16.46
22.2
0.62
22.2
1.55
22.2
1.11
28.6
28.06
28.6
1.05
28.6
2.64
28.6
1.88
34.9
34.9
1.56
34.9
3.9
34.9
2.78
*at SCT = 35°C & Subcooling = 5.6°C,SST = 13.7°C & Superheat=5.6°C
Table 11 - Estimated R410A Refrigerant Charge per 5 ft
Liquid
Line
Additional
R410A
charge per
5 ft of line
(oz)*
Suction
Line
Additional
R410A
charge per
5 ft of line
(oz)*
Reheat
Line
Additional
R410A
charge per
5 ft of line
(oz)*
Hot Gas
Bypass
Line
Additional
R410A
charge per
5 ft of line
(oz)*
3/8od
2.58
3/8od
0.10
3/8od
0.24
3/8od
0.17
1/2od
5.08
1/2od
0.19
1/2od
0.48
1/2od
0.34
5/8od
8.23
5/8od
0.31
5/8od
0.77
5/8od
0.55
3/4od
11.85
3/4od
0.44
3/4od
1.12
3/4od
0.80
7/8od
16.46
7/8od
0.62
7/8od
1.55
7/8od
1.11
1-1/8od
28.06
1-1/8od
1.05
1-1/8od
2.64
1-1/8od
1.88
1-3/8od
1-3/8od
1.56
1-3/8od
3.90
1-3/8od
2.78
* at SCT = 115
o
F & Subcooling = 10
o
F, SST = 45
o
F & Superheat=10
o
F
Special Low Ambient Option Charging
Instructions
For units equipped with low ambient
refrigerant flood back option being charged
in the summer when the ambient
temperature is warm:
If the ambient is above 21°C (70°F), charge
to approximately 0.6-1.1°C (1-2°F) of sub-
cooling measured at the inlet to the expansion
valve. Once enough charge has been added
to get the evaporator superheat and sub-
cooling values to the correct setting, more
charge must be added. For units with Fin &
Tube Condenser coils, use Table to find the