18-BC77D1-6
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.
3 1/2 Ton Heat Pump
60
Add 6º
50
Add 5º
40
30
25
20
Add 1º
15
10
0
10
20
25
30
40
60
RE
FRI
G
E
RA
NT L
INE
L
IFT (
FT)
SUBCOOL CHARGING CHART CORRECTIONS TABLE
Use Design Subcooling
TOTAL REFRIGERANT LINE LENGTH (FT)
Add 3º
Add 2º
048 Heat Pump
60
Add 5º
50
Add 4º
40
30
25
Add 1º
20
15
10
0
10
20
25
30
40
60
Add 2º
RE
FRI
G
E
RA
NT L
INE
L
IFT (
FT)
SUBCOOL CHARGING CHART CORRECTIONS TABLE
Use Design Subcooling
TOTAL REFRIGERANT LINE LENGTH (FT)
061 Ton Heat Pump
60
50
30 ft. Maximum Lift
40
30
Add 1º
25
20
15
10
0
10
20
25
30
40
60
RE
FRI
G
E
RA
NT L
INE
L
IFT (
FT)
SUBCOOL CHARGING CHART CORRECTIONS TABLE
Use Design Subcooling
TOTAL REFRIGERANT LINE LENGTH (FT)
049 Heat Pump
60
Add 5º
50
Add 4º
40
Add 2º
Add 3º
30
Add 2º
25
20
15
10
0
10
20
25
30
40
60
RE
FRI
G
E
RA
NT L
INE
L
IFT (
FT)
SUBCOOL CHARGING CHART CORRECTIONS TABLE
Add 1º
Use Design Subcooling
TOTAL REFRIGERANT LINE LENGTH (FT)
060 Ton Heat Pump
60
Add 6º
50
Add 5º
40
Add 3º
Add 4º
30
Add 3º
25
Add 2º
20
15
Add 1º
10
Use Design Subcooling
0
10
20
25
30
40
60
RE
FRI
G
E
RA
NT L
INE
L
IFT (
FT)
SUBCOOL CHARGING CHART CORRECTIONS TABLE
TOTAL REFRIGERANT LINE LENGTH (FT)
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
Use Design Subcool Value
60
50
40
30
25
20
15
10
0
Add 5°
Add 4°
Add 2°
Add 3° of Subcooling
Add 1° of Subcooling
3 Ton Heat Pump
2 1/2 Ton Heat Pump
60
Add 2º
50
Add 1º
40
30
25
20
15
Use Design Subcooling
10
0
10
20
25
30
40
60
RE
FRI
G
E
RA
NT L
INE
L
IFT (
FT)
SUBCOOL CHARGING CHART CORRECTIONS TABLE
TOTAL REFRIGERANT LINE LENGTH (FT)
Add 3°
Add 2°
TOTAL REFRIGERANT LINE LENGTH (FEET)
REFRIGERANT LINE LIFT (FEET)
10
20
25
30
40
60
Add 1° 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)
1 1/2 Ton Heat Pump
2 Ton Heat Pump
60
Add 1º
50
40
30
25
20
Use Design Subcooling
15
10
0
10
20
25
30
40
60
TOTAL REFRIGERANT LINE LENGTH (FT)
RE
FRI
G
E
RA
NT L
INE
L
IFT (
FT)
SUBCOOL CHARGING CHART CORRECTIONS TABLE
