Emerson 480V Manuel D’Utilisation

1. Remove any packaging material, then visually examine the UPS and battery equipment for 

transit damage, both internally and externally. Report any such damage to the shipper and to 

Liebert immediately.

2. Check the nameplate inside the cabinet door to verify that the model number and rating 

correspond to the ones specified. Record the model number and serial number in the front of this 

installation manual. This information is necessary should service be required.

3. Check for loose connections or unsecured components in the cabinet.
4. Check for shipping damage to internal components.

If the equipment will not be installed immediately, it must be stored indoors where the humidity is no 

higher than 90% and the temperature is no higher than 104°F (40°C). The storage area must protect 

the Liebert NX from excessive moisture (see 5.2 - UPS Environmental).

The equipment supplied has an identification tag on the back of the main door listing the type and 

size of the UPS.

Choose a location for the UPS that offers:

• Easy connection to inputs, outputs and auxiliary equipment
• Enough space to service the UPS
• Air circulation sufficient to expel heat produced by UPS
• Protection against moisture and excessive humidity
• Protection against dust and other particulate matter
• Compliance with fire prevention regulations and practices
• Operating environment temperature of 74-80°F (23-27°C) for maximum battery efficiency

Before installing the Liebert NX, verify that the UPS room satisfies the environmental conditions 

stipulated in 5.2 - UPS Environmental, paying particular attention to the ambient temperature 

and air exchange system.
The UPS unit should be installed in a cool, dry, clean-air environment with adequate ventilation to 

keep the ambient temperature within the specified operating range 32°F to 104°F (0°C to 40°C). 
For optimal UPS and battery system performance and service life, maintain the operating tempera-

ture within the range of 74-80°F, (23-27°C).
The Liebert NX UPS cooled by internal fans. Cooling air enters the unit through the front of the unit 

and is exhausted out the top. To permit proper air flow and prevent overheating, do NOT block or 

cover the ventilation openings or blow air down onto the unit. Ventilation clearance above the unit 

must be a minimum of 8 in. (203mm).
See Table 7 for details on heat dissipation.

If the battery cabinet must remain disconnected from power for more than six (6) months, the 

battery must be recharged before use. To charge the batteries, the battery cabinet must be 

connected to the Liebert NX UPS and the UPS must be connected to utility power and started 

up because the charger operates only while the Liebert NX UPS is operating.

When batteries are installed in a cabinet adjacent to the UPS unit, the battery—not the 

UPS—dictates the designed maximum ambient operating temperature.