Figure 2-11. Two-position control.

Figure 2-10. Two loops controlling one device (humidity control with high limit).

Figure 2-12. Simple Control Loop Applied To Outside Air Heating.

Heating, Ventilating, and Air Conditioning (HVAC) Control Systems - index
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151

CEMP-E

TI 810-11

30 November 1998

UNIT HEATER

19 DEG C

OFF

(67 DEG F)

1 DEG C (2 DEG F)

DIFFERENTIAL

18 DEG C

ON

(65 DEG F)

ROOM THERMOSTAT

UNIT OFF

UNIT OFF

OVERSHOOT

UNDERSHOOT

19 DEG C

(67 DEG F)

18 DEG C

(65 DEG F)

UNIT ON

UNIT OFF

TIME

Figure 2-11. Two-position control.

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