Bryant Understanding the 580J Nomenclature and EconoMi$er IV Logic

580J

Table 22 – EconoMi$er IV Input/Output Logic

	INPUTS						OUTPUTS
Demand Control	Enthalpy*				Compressor		N Terminal†
	Outdoor	Return	Y1	Y2	Stage	Stage	Occupied	Unoccupied
Ventilation (DCV)
					1	2	Damper
	High	Low	On	On	On	On	Minimum position	Closed
	(Free Cooling LED		On	Off	On	Off
	Off)
Below set			Off	Off	Off	Off
			On	On	On	Off	Modulating** (between	Modulating**
(DCV LED Off)	Low
		High					min. position and	(between closed and
	(Free Cooling LED
			On	Off	Off	Off
							full-open)	full-open)
	On)
			Off	Off	Off	Off	Minimum position	Closed
	High		On	On	On	On	Modulating†† (between	Modulating††
								(between closed and
	(Free Cooling LED	Low	On	Off	On	Off	min. position and DCV
								DCV
Above set	Off)						maximum)
			Off	Off	Off	Off		maximum)
(DCV LED On)
	Low	High	On	On	On	Off	Modulating***	Modulating†††
	(Free Cooling LED
			On	Off	Off	Off
	On)
			Off	Off	Off	Off

*For single enthalpy control, the module compares outdoor enthalpy to the ABCD setpoint.

†Power at N terminal determines Occupied/Unoccupied setting: 24 vac (Occupied), no power (Unoccupied). ** Modulation is based on the supply-air sensor signal.

†† Modulation is based on the DCV signal.

*** Modulation is based on the greater of DCV and supply-air sensor signals, between minimum position and either maximum position (DCV) or fully open (supply-air signal).

††† Modulation is based on the greater of DCV and supply-air sensor signals, between closed and either maximum position (DCV) or fully open (supply-air signal).

C06053

Fig. 64 - EconoMi$er IV Functional View

EconoMi$er IV

Table 22 provides a summary of EconoMi$er IV. Troubleshooting instructions are enclosed.

A functional view of the EconoMi$er is shown in Fig. 64. Typical settings, sensor ranges, and jumper positions are also shown. An EconoMi$er IV simulator program is available from Bryant to help with EconoMi$er IV training and troubleshooting.

EconoMi$er IV Standard Sensors

Outdoor Air Temperature (OAT) Sensor

The outdoor air temperature sensor (HH57AC074) is a 10 to 20 mA device used to measure the outdoor-air temperature. The outdoor-air temperature is used to determine when the EconoMi$er IV can be used for free cooling. The sensor is factory-installed on the EconoMi$er IV in the outdoor airstream. (See Fig. 60.) The operating range of temperature measurement is 40_ to 100_F (4_ to 38_C). (See Fig. 67.)

52