Dual Cooling At 100% Capacity – No Dead Band; Optional Staged Electric Reheat - Emerson Liebert iCOM Training And Service Manual

iCOM
Control Training and Service Manual
Dual Cooling at 100% Capacity – No Dead Band
An addition program is available with the Dual Cooling option. The program is
called Minimum Chilled Water Temperature. This program allows the end user to
select a Minimum Chilled Water Temperature setpoint that will not permit
simultaneous operation of the chilled water valve and compressors. When the
supply chilled water temperature decreases to the programmed value, the chilled
water valve control is operational and the compressors are NOT permitted to
operate. If the chilled water temperature increases 2°F above the setpoint, then
the compressors are permitted to operate again if needed.

Optional Staged Electric Reheat

The basic temperature heating 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 reheat stages.
When Liebert DS units are supplied with the optional three (3) stage electric reheat
assembly, the three (3) stages (elements) will operate in an on/off configuration to
reheat the unit discharge air as it enters the space.
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