Bryant 581B036--072, 581C024--060 Damper Movement, Thermostats, Demand Controlled Ventilation DCV

Page 23

To control the minimum damper position remotely, remove the factory-installed jumper on the P and P1 terminals on the EconoMi$er IV controller. Wire the field-supplied potentiometer to the P and P1 terminals on the EconoMi$er IV controller. (See Fig. 39.)

Damper Movement

Damper movement from full open to full closed (or vice versa) takes 21/2 minutes.

Thermostats

The EconoMi$er IV control works with conventional thermostats that have a Y1 (cool stage 1), Y2 (cool stage 2), W1 (heat stage 1), W2 (heat stage 2), and G (fan). The EconoMi$er IV control does not support space temperature sensors. Connections are made at the thermostat terminal connection board located in the main control box.

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

C06035

Fig. 36 ---Outside Air Temperature

Changeover Set Points

Occupancy Control

The factory default configuration for the EconoMi$er IV control is occupied mode. Occupied mode is provided by the black jumper from terminal TR to terminal N. When unoccupied mode is desired, install a field-supplied timeclock function in place of the jumper between TR and N. (See Fig. 29.) When the timeclock contacts are closed, the EconoMi$er IV control will be in occupied mode. When the timeclock contacts are open (removing the 24-v signal from terminal N), the EconoMi$er IV will be in unoccupied mode.

Typically the maximum ventilation rate will be about 5 to 10% more than the typical cfm required per person, using normal outside air design criteria.

Demand Controlled Ventilation (DCV)

When using the EconoMi$er IV for demand controlled ventilation, there are some equipment selection criteria which should be considered. When selecting the heat capacity and cool capacity of the equipment, the maximum ventilation rate must be evaluated for design conditions. The maximum damper position must be calculated to provide the desired fresh air.

A proportional anticipatory strategy should be taken with the following conditions: a zone with a large area, varied occupancy, and equipment that cannot exceed the required ventilation rate at design conditions. Exceeding the required ventilation rate means the equipment can condition air at a maximum ventilation rate that is greater than the required ventilation rate for maximum occupancy. A proportional-anticipatory strategy will cause the fresh air supplied to increase as the room CO2 level increases even though the CO2 set point has not been reached. By the time the CO2 level reaches the set point, the damper will be at maximum ventilation and should maintain the set point.

In order to have the CO2 sensor control the economizer damper in this manner, first determine the damper voltage output for minimum or base ventilation. Base ventilation is the ventilation

581B,C

ECONOMI$ER IV

ECONOMI$ER IV CONTROLLER

GROMMET

required to remove contaminants during unoccupied periods. The following equation may be used to determine the percent of outside-air entering the building for a given damper position. For best results there should be at least a 10 degree difference in outside and return-air temperatures.

(TO x 100OA ) + (TR x 100RA ) =TM

RETURN AIR TEMPERATURE

SENSOR

RETURN DUCT (FIELD-PROVIDED)

C06036

Fig. 37 ---Return Air Temperature or Enthalpy

Sensor Mounting Location

TO = Outdoor-Air Temperature OA = Percent of Outdoor Air TR = Return-Air Temperature RA = Percent of Return Air TM = Mixed-Air Temperature

Once base ventilation has been determined, set the minimum damper position potentiometer to the correct position.

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Contents Installation Instructions Rig and Place Unit Install External Trap for Condensate DrainProvide Unit Support Field Fabricate DuctworkRoof Curb Details Install Gas Piping Install Flue HoodRoof Curb Alignment 581B 036-072 Base Unit Dimensions 581C 024-060 Base Unit Dimensions Make Electrical Connections Field Power SupplyField Control Wiring Heat Anticipator SettingsBase Unit 581B Physical Data 581BUnit Size 581B Base Unit 581C Physical Data 581CUnit Size 581C Power Wiring Connections 581C024---060 Electrical Data 581CElectrical Data 581B Manual Outdoor Damper Adjust Factory-Installed OptionsAssembly Perfect Humidity Adaptive Dehumidification SystemTypical Perfect Humidity t Adaptive Dehumidification System Outdoor-Air Damper With Hood Attached Outdoor Air Lockout Sensor Supply Air Temperature SAT SensorSupply Air Sensor Temperature Resistance Values Temperature FDifferential Dry Bulb Control Economi$er IV Control ModesOutdoor Dry Bulb Changeover Economi$er IV Sensor UsageEconoMi$er IV Wiring Minimum Position Control Exhaust Set Point AdjustmentDemand Controlled Ventilation DCV Damper MovementThermostats Enthalpy Changeover Set Points Belt Drive Motors Dehumidification of Fresh Air with DCV ControlBelt Drive Motor Mounting CO2Sensor Standard SettingsEvaporator-Fan Motor Data High-Static Motors 581B Fan Rpm at Motor Pulley Setting With High-Static MotorAccessory Static Pressure Evaporator-Fan Motor Data Standard MotorARI Octave Bands Unit Rating 581B Outdoor Sound Power Total Unit581C Outdoor Sound Power Total Unit ARI Octavebands Rating Unit Weighted1300 Rpm Bhp1100 1200Rpm Bhp Watts 1700 Rpm Bhp WattsWatts Rpm Bhp 1200 16001642 2333 1704 Rpm Bhp Watts 15002800 Watts Rpm Bhp 18002600 2700Bhp 600 Bhp Watts Rpm2700 2800 2900 3000 Watts Rpm Bhp 900 Bhp Watts 900Watts Rpm Bhp Watts 1700 1800 1900 20001900 2000 2100 2200 2300 2400 2500 800 350 904 438 999 535 1087 640 1169 753 913 569 913 569 1010 715 Gas Piping Internal WiringRefrigerant Service Ports Unit PreparationMain Burners Compressor RotationCooling Operating Sequence Safety ReliefHeating Ventilation Continuous FanHeating Units With Economi$er Subcooling ModeHot Gas Reheat Mode One-Row Coils CleaningEvaporator Coil Condenser CoilLoss-of-Charge Switch Condenser-Fan AdjustmentEconoMi$er IV Adjustment High Pressure SwitchPerfect Humidity System Charging Low Charge CoolingC06142 Flue Gas Passageways 581C 3 TON Charging Chart 581C 5 TON Charging Chart Combustion-Air Blower Limit SwitchLED Error Code Description Removal and Replacement of Gas Train SeeReplacement Parts OFM Economi$er IV Troubleshooting Unit TroubleshootingLED OFF Economi$er IV Troubleshooting CompletionLED Error Code Service Analysis Symptom Cause RemedyProblem Cause Remedy Heating Service AnalysisCooling Service Analysis Inputs Outputs EconoMi$er IV Input/Output LogicCatalog No. II581B---C---36---1 Preliminary Information