18-AC51D1-8-EN
19
Design Subcooling Value = __________º F
(from nameplate or Service Facts)
Subcooling Correction = __________º F
Final Subcooling Value = __________º F
STEP 2
- Determine the final subcooling value using total Line Length and Lift measured in STEP 1 and the charts below.
STEP 3
- Stabilize the system by operating for a
minimum of 20 minutes.
At startup, or whenever charge is removed or
added, the system must be operated for a mini-
mum of 20 minutes to stabilize before accurate
measurements can be made.
20 MIN.
1 1/2 - 2 Ton Units
TOTAL REFRIGERANT LINE LENGTH (FEET)
REFRIGERANT LINE LIFT (FEET)
10
20
25
30
40
60
Add 1° of Subcooling
Add 4° of
Subcooling
Use Design Subcool Value
60
50
40
30
25
20
15
10
0
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
2 1/2 Ton Units
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
TOTAL REFRIGERANT LINE LENGTH (FEET)
REFRIGERANT LINE LIFT (FEET)
10
20
25
30
40
60
Add 2° of Subcooling
Add 4° of Subcooling
Add 6° of
Subcooling
Use Design Subcool Value
60
50
40
30
25
20
15
10
0
3 Ton Units
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
TOTAL REFRIGERANT LINE LENGTH (FEET)
REFRIGERANT LINE LIFT (FEET)
10
20
25
30
40
60
Add 2° of Subcooling
Add 4° of
Subcooling
Use Design Subcool Value
60
50
40
30
25
20
15
10
0
3 1/2 Ton Units
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
TOTAL REFRIGERANT LINE LENGTH (FEET)
REFRIGERANT LINE LIFT (FEET)
10
20
25
30
40
60
Add 2° of Subcooling
Add 4° of Subcooling
Add 5° of
Subcooling
Use Design Subcool Value
60
50
40
30
25
20
15
10
0
4 Ton Units
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
TOTAL REFRIGERANT LINE LENGTH (FEET)
REFRIGERANT LINE LIFT (FEET
)
10
20
25
30
40
60
80
Add 2° of Subcooling
Add 4°
Add 6° of
Subcooling
Use Design Subcool Value
60
50
40
30
25
20
15
10
0
5 Ton Units
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
TOTAL REFRIGERANT LINE LENGTH (FEET)
REFRIGERANT LINE LIFT (FEET)
10
20
25
30
40
60
Add 2° of Subcooling
Add 5°
Use Design Subcool Value
60
50
40
30
25
20
15
10
0