LEGEND

Potentiometer Default Settings:

DCV — Demand Controlled Ventilation

Power Exhaust

Middle

Minimum Pos.

Fully Closed

IAQ — Indoor Air Quality

DCV Max.

Middle

LALS — Low Temperature Compressor

DCV Set

Middle

Lockout Switch

Enthalpy

C Setting

OAT — Outdoor-Air Temperature

 

 

POT — Potentiometer

NOTES:

1.620 ohm, 1 watt 5% resistor should be removed only when using differential enthalpy or dry bulb.

2.If a separate field-supplied 24 v transformer is used for the IAQ sensor power supply, it cannot have the secondary of the transformer grounded.

3.For field-installed remote minimum position POT, remove black wire jumper between P and P1 and set control minimum position POT to the minimum position.

Fig. 27 — EconoMi$erIV Wiring

Table 10 — 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

C. EconoMi$erIV Control Modes

Determine the EconoMi$erIV control mode before set up of the control. Some modes of operation may require different sensors. Refer to Table 11. The EconoMi$erIV is supplied from the fac- tory with a supply air temperature sensor, a low temperature compressor lockout switch, and an outdoor air temperature sensor. This allows for operation of the EconoMi$erIV with out- door air dry bulb changeover control. Additional accessories can be added to allow for different types of changeover control and operation of the EconoMi$erIV 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$erIV will adjust the outdoor-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. 28. The scale on the potentiometer is A, B, C, and D. See Fig. 29 for the corresponding temperature changeover values.

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Bryant 580F operation manual EconoMi$erIV Control Modes, Temperature F

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