Emerson 115-480 Manuel D’Utilisation

Before installing the Liebert

®

 APM

™

, verify that the UPS room satisfies the environmental conditions 

stipulated in 11.2 - 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 

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

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

cover the ventilation openings or blow air down onto the unit. The UPS requires 24 in. (610mm) 

ventilation clearance above the unit and 12" (305mm) behind the UPS.
See Table 46 for details on heat dissipation.

Temperature is a major factor in determining battery life and capacity. Battery manufacturers 

recommend an operating temperature of 77°F (25°C). Ambient temperatures warmer than this reduce 

battery life; temperatures below this reduces battery capacityv. In a typical installation, battery 

temperature should be maintained between 74°F and 80°F (23-27°C). Batteries should be placed 

where there are no main heat sources or air inlets to prevent portions of batteries from being either 

much warmer or much cooler than other parts of the batteries.

Ensure that the UPS weight is within the designated surface weight loading (lb./ft

2

 or kg/cm

2

) of any 

handling equipment. See Table 34 for weights of various units.
The Liebert APM may be rolled on its casters for short distances only. For longer distances, move the 

UPS with a forklift or similar equipment to ease the relocation and to reduce vibration.
The optional battery cabinets should be moved with a forklift or similar equipment.

When the equipment has been finally positioned, ensure that the adjustable stops are set so that the 

UPS will remain stationary and stable (see 6.0 - Installation Drawings).
The Liebert APM and its auxiliary cabinets must be installed on a concrete or equivalent, non-

resilient floor.

Risk of moving heavy unit. Can cause property damage, injury and death.
Ensure that any equipment that will be used to move the Liebert APM has sufficient lifting 

capacity. The Liebert APM’s weight ranges from 1100 to 2750 lb. (500 to 1250kg). See 

Table 34 for details.
The UPS presents a tipping hazard. Do not tilt the Liebert APM more than 15 degrees from 

vertical.
The UPS is fitted with casters—Take care to prevent movement when unbolting the 

equipment from its shipping pallet. Ensure adequate personnel and lifting equipment are 

available when taking the Liebert APM off its shipping pallet.

Risk of heavy unit tipping over while being moved. Can cause property damage, injury and 

death.
The casters are strong enough for movement across even surfaces only. Casters may fail if 

they are subjected to shock loading, such as being dropped or rolled over holes in the floor or 

obstructions. Such failure may cause the unit to tip over, injuring personnel and damaging 

the equipment.
Care must be taken when maneuvering units fitted with batteries. Keep such moves to a 

minimum. For further information, see Battery Cabinet Precautions on page 3.