Emerson CW Manuel D’Utilisation

These specifications describe requirements for a precision environmental control system. The system 

shall be designed to maintain temperature conditions in the rooms containing electronic equipment. 
The manufacturer shall design and furnish all equipment to be fully compatible with heat dissipation 

requirements of the room.

The precision environmental control system shall be a Liebert self-contained factory assembled unit 

with (upflow) (down-flow) air delivery. The system shall have a total cooling capacity of ____ BTU/ 

HR, (kW) with a sensible cooling capacity of ____ BTU/ HR (kW) based on an entering air temperature 

of ____ °F (°C) dry bulb and ____ °F (°C) wet bulb. The unit is to be supplied with ____ volt ____ ph 

____ Hz electrical service.

Submittals shall be provided with the proposal and shall include: Single-Line Diagrams; Dimen-

sional, Electrical, and Capacity Data; Piping and Electrical Connection Drawings.

The frame shall be constructed of heliarc welded tubular steel. It shall be painted using the auto-

phoretic coating process for maximum corrosion protection. The exterior panels shall be insulated 

with a minimum 1 in. (25.4mm), 1.5 lb. (0.68 kg) density fiber insulation. The main front panel shall 

have captive 1/4 turn fasteners. The main unit color shall be _________. The accent color shall be 

_________. The exterior panels shall be powder coated.

The filter chambers shall be an integral part of the system, located within the cabinet serviceable 

from either end of the unit. The filters shall be rated not less than ____% efficiency (based on 

ASHRAE 52.1).
For models CW106 and CW114, the filters shall be serviceable from the front of the unit.

The fan shall be the centrifugal type, double width double inlet, and shall be factory-balanced as a 

completed assembly. The shaft shall be heavy duty steel with self-aligning ball bearings with a mini-

mum life span of 100,000 hours. The fan motor shall be ____ hp at 1750 RPM at 60 Hz (1450 RPM at 

50 Hz) and mounted on an adjustable slide base. The drive package shall be two-belt, variable speed, 

sized for 200% of the fan motor horsepower. The fans shall be located to draw air over the A-frame coil 

to ensure even air distribution and maximum coil performance.

The fan shall be the plug/plenum type, single inlet and shall be dynamically balanced. The fan motor 

shall be 4.2 hp, 1520 rpm maximum operating speed. The drive package shall be direct drive Electron-

ically Commutated, variable speed. The fans shall be located to draw air over the A-frame coil to 

ensure even air distribution and maximum coil performance.

The Liebert iCOM unit control shall be factory-set for Intelligent Control which uses “fuzzy logic” and 

“expert systems” methods. Proportional and Tunable PID shall also be user selectable options. Inter-

nal unit component control shall include the following: