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

Page 18

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—

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Contents Installation ContentsSafety Considerations Provide Unit SupportII. Field Fabricate Ductwork III. Determine Location of Drain Line and External TrapCRBTMPWR002A01 Roof Curb Unit Size Accessory CRRFCURB001A01CRBTMPWR001A01 CRBTMPWR003A01IV. RIG and Place Unit Install Flue HoodVI. Install GAS Piping Positioning048 Unit Operating Weight581B 036 060Physical Data 581B036-072 Freeze Protection Thermostat LOSS-OF-CHARGE SWITCH/LOW-PRESSUREFurnace Section OUTDOOR-AIR Inlet ScreensBase Unit Dimensions 581B036-072 Heat Anticipator Settings Field Power SupplyField Control Wiring Steel Pipe Spacing of Supports Nominal Diameter DimensionPower Wiring Connections Low-Voltage Connections With or Without EconomizerDisconnect SIZE† Power Exhaust MCA MocpFAN Motor RLA LRA FLA MCA MocpSIZE† FAN Motor SupplyPerfect Humidity Dehumidification System VIII. Adjust FACTORY-INSTALLED OptionsDisconnect Switch LPSDamper Panel with Manual Outdoor-Air Damper Installed Manual Outdoor-Air DamperOptional Manual Outdoor-Air Damper With Hood Attached Indoor Coil Access Panel Relocation EconoMi$er IV Standard SensorsBarometric Flow Capacity Supply Air Sensor Temperature/Resistance Values EconoMi$er IV Control ModesEconoMi$er IV Sensor Usage Return Air Temperature or Enthalpy Sensor Mounting Location Enthalpy Changeover Set Points Page IX. Adjust EVAPORATOR-FAN Speed 581B Fan Rpm at Motor Pulley Setting With Standard Motor581B Fan Rpm at Motor Pulley Setting With High-Static Motor 581B Phase Continuous BHPUnit Maximum Unit Voltage AMP DrawAccessory/FIOP EconoMi$er IV Static Pressure* in. wg Outdoor Sound Power Total UnitEvaporator-Fan Motor Data High-Static Motors 1320 1310 1371 1419 1500 1175 1086 1294 1175 1346 1275 1400 1147 9721265 1292701 306 810 426 901 540 981 651 666 257 778 367 871 471 952 572670 7601470 1784 16491803 1967805 967 5631008 643 1049 7311000 582 163 Rpm Bhp Watts 900 553 134782 316 870 417 948 807 358 894 466 971707 326 643 234 762675 277 740 382879 483 974 580 800 350 904 438 999 535839 412 938 505 1030 605 919 561839 412 938 505 1030 605 1115 714 800 350 904 438 999 535 1087 640753 829General FAN Performance Notes PRE-START-UP VI. Internal WiringVII. Refrigerant Service Ports START-UP Unit PreparationCooling XI. Main BurnersXII. Heating XIII. Safety Relief XV. Operating SequencePerfect Humidity Normal Design Cooling Operation Thermostat Input Economizer Function 581B Unit OperationVI. HIGH-PRESSURE Switch Service CleaningIV. ECONOMI$ER IV Adjustment VII. LOSS-OF-CHARGE SwitchPerfect Humidity System Charging To Use Cooling Charging Chart, Standard UnitLow Charge Cooling Unit 581BCooling Charging Chart, Standard 581B036 Condenser FAN Must be Operating Flue GAS Passageways XII. Limit SwitchXV. Replacement Parts XI. COMBUSTION-AIR BlowerLOW Heat Units Medium High Heat UnitsCLO CAPOLR CompSymptom Cause Remedy Troubleshooting Unit TroubleshootingLED Error Code Service Analysis LED OFFHeating Service Analysis Problem Cause RemedyCooling Service Analysis Problem Cause RemedyII. ECONOMI$ER IV Troubleshooting Inputs Outputs EconoMi$er IV Troubleshooting CompletionEconoMi$er IV Input/Output Logic Demand Control EnthalpyIndex Page Preliminary Information START-UP ChecklistTemperatures III. START-UP Electrical
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581B specifications

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