Liebert iCOM Microprocessor TM-10098 Manual de usuario descargar pdf (Pagina 23)

iCOM

Controls Training and Service Manual

of the heating proportional band. The third electric heating stage activates when

the return air temperature decreases to 100% of the heating proportional band.

The temperature controller deactivates the third heating stage when the return air

temperature increases to 66% of the heating proportional control band value. The

second heating is deactivated when the return air temperature increases to 33% of

the heating proportional control band value. The first heating stage is deactivated

when the return air temperature increases to the temperature set point value or

0% of the heating proportional control band value.

3 Stage Electric Reheat – No Dead Band

Temp Set Point: 70°F

Proportional Band: 8°F

65 66 67 68 69 70

Decreasing Temperature

Reheat 1 On

Temp Set Point - (1/2 Proportional Band)

Reheat 3 On

Reheat 2 On

Reheat

3 Off

Reheat

2 Off

Reheat

1 Off

Note: in the above example that the control band begins at the 70°F temperature

set point and has a length of 4°F, which is ½ of the programmed temperature

proportional band value.

As the return air temperature decreases Reheat 1 is activated at 68.7°F or 33% of

the heating control band. If the return air temperature continues to decrease

Reheat 2 will activate at 67.4°F or 66% of the heating control band. If the return

air temperature continues to decrease Reheat 3 will activate at 66°F or 100% of

the heating control band.

When the return air temperature starts to increase, Reheat 3 is deactivated at

67.4°F or 66% of the heating control band, Reheat 2 is deactivated at 68.7°F or

33% of the heating control band and Reheat 1 is deactivated at the temperature

set point of 70°F or 0% of the heating control band.

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Liebert iCOM Microprocessor TM-10098 Manual de usuario Pagina 23