Emerson Liebert ICOM-DO Service Manual download pdf (Page 12)

iCOM

Control Training and Service Manual

Temperature Control

Operations and Charts

The temperature proportional control band value is divided into two parts: the

temperature set point plus ½ of the temperature proportional band for cooling

operation and the temperature set point minus ½ of the temperature proportional

band for heating operation. A temperature dead band can also be programmed

into the control to shift the cooling and/ or heating on/ off operations away from the

temperature set point.

This programmed temperature dead band value is divided into two parts: the

temperature set point plus ½ of the dead band – no cooling operation and the

temperature set point minus ½ of the band – no heating operation.

The temperature set point range is adjustable from 41 - 104°F in increments of

1°F. The temperature proportional band range is adjustable from 2 - 54°F in

increments of 1°F. The temperature dead band range is adjustable from 0 - 36°F

in increments of 1°F.

Standard 2 Stage Compressorized Cooling

The basic temperature cooling control band is established at the temperature set

point with the length equal to ½ of the programmed temperature proportional band

divided by the number of cooling stages.

The Liebert DS units are supplied with two (2) compressors, each compressor is

rated at ½ of the unit capacity. The two (2) compressors will be either the

semi-hermetic or scroll type and will operate in an on/ off configuration to cool the

space.

The temperature controller activates the first cooling stage (lead compressor)

when the return air temperature increases to 50% of the cooling proportional band

and the second cooling stage (lag compressor) at 100% of the cooling proportional

band. The optional hot gas bypass solenoid valve, supplied with each compressor

when ordered, is also energized on a call for cooling.

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Emerson Liebert ICOM-DO Service Manual Page 12