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2 1/2 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 ]
3 1/2 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 ]
5 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 ]
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 minimum of 20 minutes to
stabilize before accurate measurements can be made.
STEP 4 - Measure the liquid line temperature and pressure at the outdoor unit's service valve.
Measured Liquid Line Temp = __________ º F
Liquid Gage Pressure = __________ PSIG
Final Subcooling Value = __________ º F
STEP 5 - Use the final subcooling value, refrigerant temperature and pressure from STEP 4, to determine the
proper liquid gage pressure using Table 14.2.
Example: Assume a 12º F Final Subcooling value and liquid temp of 90º F.
1. Locate 12º F Final Subcooling in Table 14.2.
2. Locate the Liquid Temperarature (90º F) in the left column.
3. The Liquid Gage Pressure should be approximately 327 PSIG. (This is the shown as the intersection of
the Final Subcooling column and the Liquid Temperature row.)
88-A4HP4001-1G-EN
1°
Add 2°
Add 1°
Add 1°
1°
80
90 100 110 120 130 140 150
Add 4°
Add 1°
Add 2°
Add 1°
Add 1°
80
90 100 110 120 130 140 150
Add 4°
1°
1°
Add 2°
Add 1°
Add 1°
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 ]
4 Ton Heat Pump
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
50
1°
1°
40
Add 1°
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 ]
Design Subcooling Value = __________º F
(from nameplate or Service Facts)
Subcooling Correction = __________º F
Final Subcooling Value = __________º F
4°
Add 2°
Add 1°
1°
Add 4°
Add 2°
Add 1°
13
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