c. In the Evaporator Fan options, set Motors to On to operate the fan during Manual Mode.
d. In Compressor Circuit 1 options, set the Compressor Mode to Charge to operate Compressors 1A and 1B
at full capacity. Turn Compressor 1A and 1B to On. The EEV will modulate to control superheat setpoint.
e. Reset the charge function as many times as needed to complete unit charging.
NOTE: You must establish and maintain a minimum 20 psig (138 kPa) for the compressor to operate.
8. Check out the subcooling using the Schrader port on the liquid line just before the expansion valve. Superheat
should be around 13°F (7.2°C) before verifying subcooling.
9. Adjust the refrigerant level to meet the subcooling shown in Table 6.12 below
10. After adjusting the refrigerant, allow the system to operate an additional 15 minutes before checking the need
of further adjustment.
NOTE: A digital scroll compressor can have a clear unit sight glass on the liquid line only when operating at 100%
capacity. When operating below 100% capacity, the unit sight glass may show bubbles with each 15 second unloading
cycle.
Outdoor Ambient Subcooling
°F °C °F °C
-30 -34.4 10 5.5
-15 -26.1 10 5.5
0 -17.8 10 5.5
15 -9.4 10 5.5
30 -1.1 10 5.5
45 7.2 10 5.5
60 15.6 10 5.5
75 23.9 10 5.5
85 29.4 10 5.5
95 35 10 5.5
105 40.6 12 6.7
115 46.1 14 7.8
Subcooling should be within ± 3°F (1.7°C)
Table 6.12 Target Subcooling at Outdoor Temperature
11. Repeat steps 7 through 10 for Compressor Circuit 2.
12. Change E177.1 and E177.2 back to 15 minutes after both circuits are charged.
Vertiv | Liebert® DSE Thermal Management System Installer/User Guide
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