Power Spd; Thermal Expansion Valve - Liebert DM Series User Manual

3. Connect the power cable correctly.
4. Restore the humidity setpoint to the original setting.

6.2.6 Power SPD

Power SPD
The position of the power SPD is shown in Figure 6-6.
The power SPD has four status indicators, as shown in Figure 6-7. The status indicators are green in normal
operation; they become red upon failure.
The power SPD does not need special maintenance. It needs regular check for non-loosening and normal status
indicating.
If any one of the following phenomena appears, the power SPD has failed and it needs to be replaced immediately.
1. Any indicator of the power SPD turns red.
2. The customer alarm 1 is generated (see SPD (Customer 1 terminal) in 3.5.1 Connecting Control Terminals).

6.2.7 Thermal Expansion Valve

The thermal expansion valve keeps the evaporator supplied with enough refrigerant to satisfy load conditions. Its
proper operation can be determined by measuring the superheat level. The correct superheat setting is 5.6°C to
8.3°C (10°F to 15°F).
Power SPD
Figure 6-6 Power SPD position
L/N L/N
Status indicator
(4 pcs)
ALARM
1-ph power SPD
Figure 6-7 Status indicator position of power SPD
New Liebert_DM Series Air Conditioner User Manual
Chapter 6 System Maintenance
L1 L2 L3
Status indicator
(4 pcs)
N N
ALARM
3-ph power SPD
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