Справочник Пользователя для Emerson DH
Introduction
1
1.0
I
NTRODUCTION
1.1
System Description
Liebert Deluxe environmental control systems are available in several configurations. Each configu-
ration can operate with either Advanced Microprocessor Controls (AM), or Advanced Microprocessor
Controls with Graphics (AG). A brief description of each, including operational differences, are listed
below. Check model numbers to see what is supplied with your unit.
1.1.1 Compressorized Two-Step Systems
These systems may be air, water, or glycol cooled - depending on the heat rejection method selected.
Cooling
Two stages of mechanical refrigeration
Heating
Three stages of electric reheat standard; steam/hot water, hot gas on water and glycol-cooled systems
optional
Humidification
Infrared standard, steam grid and steam generating optional
Dehumidification
Utilizes the lag compressor
1.1.2 Compressorized Four-Step Systems
The 4-stage systems have all the features of a compressorized 2-stage system plus cylinder unloaders
on one head of each compressor. This permits the compressors to operate at a reduced level and
increases energy efficiency during low load conditions. The system responds to an increasing room
load with either a two step or a four step process of increasing the unit's cooling.
Cooling
Four stages of mechanical refrigeration:
1. Lead compressor at reduced capacity.
2. Lead and lag compressors at reduced capacity.
3. Lead compressor at full capacity; lag compressor at reduced capacity.
4. Lead and lag compressors at full capacity.
1. Lead compressor at reduced capacity.
2. Lead and lag compressors at reduced capacity.
3. Lead compressor at full capacity; lag compressor at reduced capacity.
4. Lead and lag compressors at full capacity.
Heating
Three stages of electric reheat standard; hot water/steam optional
Humidification
Infrared standard, steam grid and steam generating optional
Dehumidification
Utilizes the lag compressor