Introduction; Product Information - Data Aire gForce Ultra User Manual

1. INTRODUCTION

Product Information

1.1
The Data Aire gForce Ultra environmental control, direct expansion, single and dual
circuit Computer Room Air Conditioner (CRAC) equipment provides a high sensible
cooling, is self-contained, factory assembled, piped, wired, and factory tested prior to
shipment. These units include an enclosure/cabinet assembly, fan section, filter section,
cooling coil, controls, and interconnecting piping internal to unit.
The Data Aire CRAC unit provides cooling, reheat, humidification, dehumidification and
air filtration. The unit is provided with a Data Aire dap4™ microprocessor controller for
precision control. The unit must be operated in a conditioned space within the
operating envelope ASHRAE recommends for data centers. Maximum dew point is 59°F
(15°C). Operating outside this envelope can alter the operating performance and
decrease equipment reliability. Return air to the unit must be no cooler than the
ASHRAE recommendation of 68°F (20°C) DB and 40% RH or minimum WB of 54°F
(12.2°C) for proper unit operation. Operating below this can alter the operating
performance and decrease equipment reliability. Refer to ASHRAE's publication,
"Thermal Guidelines for Data Processing Environments."
The unique feature of the gForce Ultra is the application of variable capacity
compressors. The quest for greater energy efficiency is continuous; efficiency
benchmarks are always moving up. That's why Data Aire is moving toward variable
capacity compressor technology for quieter, more energy-saving performance.
Conventional compressors are designed to run at constant speed to handle a given
capacity requirement. But in data center applications, the capacity requirement varies.
In these situations, a constant speed compressor uses various capacity-regulation
techniques and can be less efficient than a compressor utilizing variable capacity
technology. A variable capacity compressor (VCC), on the other hand, saves energy
and operates more quietly by varying speed to match the workload. Tests with VCC
compressors have shown an immediate energy savings and sound level reductions.
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