Figure 21 Two Single-Step Compressors With Scr Reheat Set To Standard Mode - Liebert ICOM User Manual

Standard Mode
In Standard mode, the SCR reheat operates only when the Temperature Proportional Band calls for
heating. SCR reheat output is adjusted proportionally as the Temperature Proportional Band varies
the requirement for heating from 0% to -100%. Compressors operate only when there is a call for cool-
ing as described in 3.2.2 - Compressor Control.
Figure 21 illustrates how SCR reheat operates when SCR Control Type is set to Standard mode.

Figure 21 Two single-step compressors with SCR reheat set to Standard mode

Temp Setpoint : 70°F
Proportional Band : 8°F
Deadband : 0°F
66
-100%
Heating
67 68 69
0%
½ Proportional Band
SCR On
Cool 1
On
SCR
On
70 71 72
Cool 1 Off Cool 2
SCR Off Off
½ Proportional Band
Cooling 1 On
Cooling 2 On
25
Cool 2
On
73 74
100 %
Cooling
Operation