Trane 4TWX7 Series Installer's Manual page 18

STEP 2 - Determine the final subcooling value using total Line Length and Lift measured in STEP 1 and the charts below.
2 Ton Heat Pump
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
50
40
30
25 Use Design Subcooling
15
10
0
20 30 40 50 60 70
TOTAL REFRIGERANT LINE LENGTH (FT) - [ includes lift ]
4 Ton Heat Pump
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
1°
50
40
30
25 Use Design Subcooling
15
10
0
20 30 40 50 60 70
TOTAL REFRIGERANT LINE LENGTH (FT) - [ includes lift ]
Design Subcooling Value = __________º F
(from nameplate or Service Facts)
Subcooling Correction = __________º F
Final Subcooling Value = __________º F
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
1°
Add 2°
Add 1°
Add 1°
80 90 100 110 120 130 140 150
Add 4°
1°
Add 2°
Add 1°
Add 1°
80 90 100 110 120 130 140 150
3 Ton Heat Pump
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
50
Add 1°
40
30
25 Use Design Subcooling
15
10
0
20 30 40 50 60 70 80 90 100 110 120 130 140 150
TOTAL REFRIGERANT LINE LENGTH (FT) - [ includes lift ]
5 Ton Heat Pump
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
1°
50
1°
40
30
25 Use Design Subcooling
15
10
0
20 30 40 50 60 70 80 90 100 110 120 130 140 150
TOTAL REFRIGERANT LINE LENGTH (FT) - [ includes lift ]
20 MIN.
4°
Add 2°
Add 1°
1°
Add 4°
Add 2°
Add 1°
Add 1°
1°
18-BC109D1-1A-EN