Liebert nteleCool 2 - System Pressure Information

Maintenance
18
4. Disconnect all electrical connections.
5. Remove failed compressor.
6. Install replacement compressor and make all connections.
7. Pressurize and leak test the system at approximately 150 PSIG (1034 kPa) pressure.
8. Follow manufacturer’s instructions for cleanout kits.
9. Connect a vacuum pump to both the high and low sides of the system through properly sized
connections. Evacuate the system twice to 1500 microns, and the third time to 500 microns. Break
the vacuum each time with dry nitrogen to 2 PSIG (13.8 kPa).
10. Charge the system with refrigerant. Refer to unit serial tag for refrigerant charge amount.
11. Apply power and operate system. Check for proper operation. Suction and discharge pressures
will vary with load conditions and coil efficiency. The low pressure switch will shut the
compressor down if the suction pressure falls below the cutout setting. Conversely, the high
pressure switch will shut down the compressor if the discharge pressure exceeds the cutout
setting. High suction pressure reduces the ability of the refrigerant to cool compressor
components and can result in compressor damage. Refer to Table 4.
NOTE
The optional three-phase scroll compressor must rotate in the correct direction to ensure proper
system operation. Wiring must be phased and connected as shown:
• PHASE “A” to T1 or Ll
• PHASE “B” to T2 or L2
• PHASE “C” to T3 or L3
NOTE
High side gauge port is a liquid line connection. Proper procedures should be followed when
installing and removing gauges. A 6-foot (1.8 m) hose can hold up to 3 oz (0.1 l) of refrigerant.
Be sure to purge high side to low prior to removal.
Table 4 Pressure information
Design
Pressures
psig (kPA)
Minimum
psig (kPa)
R-407C
Maximum
psig (kPa)
R-407C
Suction 35 (241) 90 (620)
Liquid (Approx.) PSIG (kPa)
95°F (35°C) Ambient 250-290 (1723-2000)
Maximum 360-380 (2480-2618)
High Pressure Cutout 400 (2756)
Based on indoor conditions of 80°F (26.7°C), 50% RH, with clean filter(s).