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Installation & Commissioning Guide PKY470-700 Tri-Capacity Package with CM100 Control
Doc. No.0525-032
Ver. 9 180921
CHARGING METHOD 2: COOLING CHARGING CURVE
1. Start and run the unit in cool mode, ensuring that both circuit 1 and 2 system compressors are in 100%
operation and systems stabilized for 20 minutes, record discharge pressure and liquid line temperature.
2. Plot the data in the cooling charging curve below.
3. If the plotted data point falls above the charging curve, it is necessary to remove charge.
If the plotted data point falls below the charging curve, it is necessary to add charge.
3. Repeat process 1 - 3 until the plotted data point falls along the curve.
EXAMPLE:
Discharge Pressure = 3350 kPa
Liquid Line = 45
o
C
Action: Remove refrigerant charge from the system.
1750
2000
2250
2500
2750
3000
3250
3500
3750
4000
D
ischar
ge
Pr
essur
e,
kP
ag
Cooling
Charging
Curve
1000
1250
1500
1750
2000
2250
2500
2750
3000
3250
3500
3750
4000
15
20
25
30
35
40
45
50
55
60
Dischar
ge
Pr
essur
e,
kP
ag
Liquid
Line
Temperature,
o
C
Cooling
Charging
Curve
Remove charge
Add charge
REFRIGERANT CHARGING
