Trane 4TWB4018G Installer's Manual page 19

STEP 2 - Determine the final subcooling value using total Line Length and Lift measured in STEP 1 and the charts below.
1 1/2 Ton Heat Pump
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
60
50
40
30
25
20
15
10
0
10 20
TOTAL REFRIGERANT LINE LENGTH (FEET)
2 1/2 Ton Heat Pump
SUBCOOL CHARGING CHART CORRECTIONS TABLE
60
50
40
30
25
20
15
10
0
10 20 25
TOTAL REFRIGERANT LINE LENGTH (FT)
3 1/2 Ton Heat Pump
SUBCOOL CHARGING CHART CORRECTIONS TABLE
60
50
40
30
25
20
15
10 Use Design Subcooling
0
10 20 25
TOTAL REFRIGERANT LINE LENGTH (FT)
049 Heat Pump
SUBCOOL CHARGING CHART CORRECTIONS TABLE
60
50
40
30
25
20
15 Use Design Subcooling
10
0
10 20 25
TOTAL REFRIGERANT LINE LENGTH (FT)
061 Ton Heat Pump
SUBCOOL CHARGING CHART CORRECTIONS TABLE
60
50
30 ft. Maximum Lift
40
30
25
20
15 Use Design Subcooling
10
0
10 20 25
TOTAL REFRIGERANT LINE LENGTH (FT)
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.
18-BC77D1-6
Add 3°
Add 2°
Add 1° of Subcooling
Use Design Subcool Value
25 30 40 60
Add 2º
Add 1º
Use Design Subcooling
30 40 60
Add 6º
Add 5º
Add 3º
Add 2º
Add 1º
30 40 60
Add 5º
Add 4º
Add 2º Add 3º
Add 2º
Add 1º
30 40 60
Add 1º
30 40 60
2 Ton Heat Pump
SUBCOOL CHARGING CHART CORRECTIONS TABLE
60
50
40
30
25
20
15
10
0
10 20 25
TOTAL REFRIGERANT LINE LENGTH (FT)
3 Ton Heat Pump
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
60
50
40
30
25
20
15
Use Design Subcool Value
10
0
10 20 25
TOTAL REFRIGERANT LINE LENGTH (FEET)
048 Heat Pump
SUBCOOL CHARGING CHART CORRECTIONS TABLE
60
50
40
30
25
20
15 Use Design Subcooling
10
0
10 20 25
TOTAL REFRIGERANT LINE LENGTH (FT)
060 Ton Heat Pump
SUBCOOL CHARGING CHART CORRECTIONS TABLE
60
50
40
30
25
20
15
10
Use Design Subcooling
0
10 20 25
TOTAL REFRIGERANT LINE LENGTH (FT)
Design Subcooling Value = __________º F
(from nameplate or Service Facts)
Subcooling Correction = __________º F
Final Subcooling Value = __________º F
20 MIN.
Add 1º
Use Design Subcooling
30 40 60
Add 5°
Add 4°
Add 3° of Subcooling
Add 2°
Add 1° of Subcooling
30 40 60
Add 5º
Add 4º
Add 2º
Add 1º
30 40 60
Add 6º
Add 5º
Add 3º Add 4º
Add 3º
Add 2º
Add 1º
30 40 60
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