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Guide Specifications
16
GUIDE SPECIFICATIONS
1.0 GENERAL
1.1 Summary
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.
1.2 Design Requirements
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.
1.3 Submittals
Submittals shall be provided with the proposal and shall include: Single-Line Diagrams; Dimen-
sional, Electrical, and Capacity Data; Piping and Electrical Connection Drawings.
2.0 PRODUCT
2.1 Cabinet and Frame Construction
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.
2.2 Filter Chamber
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.
2.3 Fan Section
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.
2.3 Electronically Commutated (EC) Fan
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.
2.4 Liebert iCOM
™
Microprocessor Control With Small Graphic Display
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: