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.)

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Bryant 580J*08--14D appendix EconoMi$er IV Input/Output Logic, EconoMi$er IV Functional View
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580J*08--14D, F specifications

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