 T58001 and T58003 ProportionalOnly Control is an accepted means of controlling
variables such as:
 discharge air temperature
 humidity
 water temperature
 pressure

T58002 and T58004 Proportional Plus Integral (PI) Control is an accepted means of controlling variables such as closedloop arrangements utilizing modulating control devices where the control point offset associated with proportionalonly control is undesirable.
Applications include: static pressure of return fans
 return fan volume control
 chilled water temperature control
 T5800100 Time Delay provides adjustable times in order to allow the system to approach the proportional control point before the integral function of the T5800 is initiated. The PI function takes over when the pressure of the time delay signal is approximately 0.5 PSI (3.5 kPa) below the integral supply pressure (9 psig).
 optional time delay available for use with the builtin automatic control cutout feature of the T5800 Series PI Receiver Controllers.