Installation manual

Introduction
2
1.1.3 GLYCOOL
™
(Chilled Glycol Cooling) Systems
GLYCOOL systems have all of the features of a compressorized water or glycol system, plus a second
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 (flow is
controlled by a motorized valve.) This is then the primary cooling source, and it greatly reduces the
compressor operation.
Cooling
At lower fluid temperatures, the second cooling coil acts as the main cooling system. The motorized
valve opens proportionally to match the room load. At higher fluid temperatures, two or four stages of
mechanical refrigeration control the room load.
Heating
Three stages of electric reheat are standard.
Humidification
Infrared is standard; steam generating is optional
Dehumidification
These systems utilize the lag compressor.
1.1.4 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
The second coil acts as the primary cooling system. A modulating valve opens proportionally in
response to the room load. Two and four stages of mechanical refrigeration as a secondary cooling sys-
tem at higher room loads.
Heating
Three stages of electric reheat are standard.
Humidification
Infrared is standard; steam generating is optional
Dehumidification
These systems utilize the chilled water valve, then the lag compressor if required by the load.
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