Table 3 — Supply Air Sensor

Temperature/Resistance Values

TEMPERATURE (F)

RESISTANCE (ohms)

–58

200,250

–40

100,680

–22

53,010

–4

29,091

14

16,590

32

9,795

50

5,970

68

3,747

77

3,000

86

2,416

104

1,597

122

1,080

140

746

158

525

176

376

185

321

194

274

212

203

230

153

248

116

257

102

266

89

284

70

302

55

G. EconoMi$er IV Control Modes

Determine the EconoMi$er IV control mode before set up of the control. Some modes of operation may require different sensors. Refer to Table 4. The EconoMi$er IV is supplied from the fac- tory with a supply air temperature sensor and an outdoor air temperature sensor. This allows for operation of the EconoMi$er IV with outdoor air dry bulb changeover control. Additional accessories can be added to allow for different types of changeover control and operation of the EconoMi$er IV and unit.

Outdoor Dry Bulb Changeover

The standard controller is shipped from the factory config- ured for outdoor dry bulb changeover control. The outdoor air and supply air temperature sensors are included as stan- dard. For this control mode, the outdoor temperature is com- pared to an adjustable set point selected on the control. If the outdoor-air temperature is above the set point, the EconoMi$er IV will adjust the outside air dampers to mini- mum position. If the outdoor-air temperature is below the set point, the position of the outdoor-air dampers will be con- trolled to provide free cooling using outdoor air. When in this mode, the LED next to the free cooling set point potentiome- ter will be on. The changeover temperature set point is con- trolled by the free cooling set point potentiometer located on the control. See Fig. 32. The scale on the potentiometer is A, B, C, and D. See Fig. 33 for the corresponding temperature changeover values.

Differential Dry Bulb Control

For differential dry bulb control the standard outdoor dry bulb sensor is used in conjunction with an additional acces- sory dry bulb sensor (part number CRTEMPSN002A00). The accessory sensor must be mounted in the return airstream. See Fig. 34. Wiring is provided in the EconoMi$er IV wiring harness. See Fig. 27.

In this mode of operation, the outdoor-air temperature is compared to the return-air temperature and the lower tem- perature airstream is used for cooling. When using this mode of changeover control, turn the enthalpy set point potentiom- eter fully clockwise to the D setting. See Fig. 32.

Table 4 — EconoMi$er IV Sensor Usage

 

ECONOMI$ER IV WITH OUTDOOR AIR

APPLICATION

 

DRY BULB SENSOR

 

 

Accessories Required

Outdoor Air

None. The outdoor air dry bulb sensor

Dry Bulb

 

is factory installed.

Differential

 

CRTEMPSN002A00*

Dry Bulb

 

 

 

 

 

 

 

Single Enthalpy

 

 

HH57AC078

Differential

 

 

HH57AC078

 

 

 

 

and

Enthalpy

 

 

 

 

 

CRENTDIF004A00*

 

 

CO2 for DCV

 

 

 

 

 

 

Control using a

 

 

33ZCSENCO2

Wall-Mounted

 

 

 

 

 

 

 

 

CO2 Sensor

 

 

 

 

 

 

CO2 for DCV

33ZCSENCO2†

 

 

 

 

Control using a

 

OR

 

 

and

 

 

 

CRCBDIOX005A00††

Duct-Mounted

 

 

 

33ZCASPCO2**

 

 

 

 

CO2 Sensor

 

 

 

 

 

 

 

 

 

 

*CRENTDIF004A00 and CRTEMPSN002A00 accessories are used on many different base units. As such, these kits may contain parts that will not be needed for installation.

†33ZCSENCO2 is an accessory CO2 sensor.

**33ZCASPCO2 is an accessory aspirator box required for duct-mounted appli- cations.

††CRCBDIOX005A00 is an accessory that contains both 33ZCSENCO2 and 33ZCASPCO2 accessories.

Fig. 32 — EconoMi$er IV Controller Potentiometer

and LED Locations

19

 

18

LED ON

 

 

 

 

 

 

 

 

 

 

 

 

 

D

 

 

 

 

 

 

 

 

 

 

17

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

16

 

LED OFF

LED ON

 

 

 

 

 

 

 

 

 

 

C

 

 

 

 

 

 

 

 

15

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

mA

14

 

 

 

LED OFF

 

LED ON

 

 

 

 

 

 

 

 

 

 

B

 

 

 

 

 

13

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

12

 

 

 

 

 

 

LED OFF

LED ON

 

 

 

 

 

 

 

 

 

 

 

A

 

 

11

 

 

 

 

 

 

 

 

 

 

 

 

10

 

 

 

 

 

 

 

 

 

LED OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

9

 

 

 

 

 

 

 

 

 

 

 

100

 

40

45

50

55

60

65

70

75

80

85

90

95

 

 

 

 

 

DEGREES FAHRENHEIT

 

 

 

 

Fig. 33 — Outdoor Air Temperature

Changeover Set Points

18

Page 18
Image 18
Bryant 581B Supply Air Sensor Temperature/Resistance Values, EconoMi$er IV Control Modes, EconoMi$er IV Sensor Usage

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