Emerson Liebert Deluxe System/3 DH - Manual (Page 10)

Introduction
2
1.1.3 Chilled Water Systems
These systems utilize a central chiller and control cooling by modulating a control valve in the chilled
water line.
Cooling
Modulating output water valve
Heating
Three stages of electric reheat standard; steam/hot water optional
Humidification
Infrared standard, steam grid and steam generating optional
Dehumidification
Chilled water valve opens proportionally in response to room needs
1.1.4 GLYCOOL ™ (Chilled Glycol Cooling) Systems
GLYCOOL
™
systems have all of the features of a compressorized water or glycol system, plus a sec-
ond cooling coil that is connected into the water circuit. When fluid temperature is sufficiently low
(below room temperature), cooling is provided by circulating the fluid through the second cooling coil
(with the flow controlled by a motorized valve). This is then the primary cooling source, greatly reduc-
ing the compressor operation.
Cooling
Modulated cooling valve opens proportionally to match room needs (primary), two or four stages of
mechanical refrigeration (secondary)
Heating
Three stages of electric reheat standard
Humidification
Infrared standard; steam generating optional
Dehumidification
Utilizes the lag compressor
1.1.5 Dual Source Cooling Systems
This system has all the features of a compressorized system but adds a second cooling coil that is con-
nected to a source of chilled water. This second coil is controlled by a modulating control valve. It is
the primary source of cooling and dehumidification so compressor operation is reduced.
Cooling
Second coil opens proportionally in response to the room needs (primary), two or four stages of
mechanical refrigeration (secondary)
Heating
Three stages of electric reheat standard
Humidification
Infrared standard; steam generating optional
Dehumidification
Standard Controls use the lag compressor. Advanced Controls use the chilled water valve and then
the lag compressor if required by the load.