Bryant 581C024--060, 581B036--072 Compressor Rotation, Cooling, Main Burners

Page 42

581B,C

Compressor Rotation

On 3-phase units be certain that the compressor is rotating in the proper direction. To determine whether or not compressor is rotating in the proper direction:

1.Connect the service gauges to suction and discharge pressure fittings.

2.Energize the compressor.

3.The suction pressure should drop and the discharge pressure should rise, as is normal on any start-up.

If the suction pressure does not drop and the discharge pressure does not rise to normal levels:

1.Note that the indoor fan (006 and 007 three-phase units only) is probably also rotating in the wrong direction.

2.Turn off power to the unit and tag disconnect.

3.Reverse any two of the unit power leads.

4.Turn on power to the unit and energize the compressor.

The suction and discharge pressure levels should now move to their normal start-up levels.

NOTE: When the compressor is rotating in the wrong direction, the unit makes more noise and does not provide cooling.

Cooling

Set the space thermostat to the OFF position. Set the system selector switch at COOL position and the fan switch at AUTO position. Adjust the thermostat to a setting below room temperature. The compressor starts when contactor closes.

Check the unit charge. Refer to Refrigerant Charge section.

Reset the thermostat at a position above room temperature. The compressor will shut off. Evaporator fan will shut off after a 30-second delay.

To Shut Off Unit - Set the system selector switch at OFF position. Resetting the thermostat at a position above room temperature shuts off the unit temporarily until the space temperature exceeds the thermostat setting. Units are equipped with a Cycle-LOCprotection device. The unit shuts down on any safety trip and remains off; an indicator light on the thermostat comes on. Check the reason for the safety trip.

Main Burners

Main burners are factory set and should require no adjustment.

TO CHECK ignition of main burners and heating controls, move thermostat set point above room temperature and verify that the burners light and evaporator fan is energized. Check heating effect, then lower the thermostat setting below the room temperature and verify that the burners and evaporator fan turn off.

Refer to Tables 35 and 36 for the correct orifice to use at high altitudes.

Table 35—Altitude Compensation*

581B 036-072, 581C 024-060 Standard Units

 

72,000 AND

150,000 BTUH

 

115,000 BTUH

 

NOMINAL INPUT

ELEVATION

NOMINAL INPUT

 

 

(ft)

Natural

Liquid

Natural

Liquid

Gas

Propane

Gas

Propane

 

 

Orifice

Orifice

Orifice

Orifice

 

Size†

Size†

Size†

Size†

0-2,000

33

43

30

37

2,000

36

44

31

39

3,000

36

45

31

40

4,000

37

45

32

41

5,000

38

46

32

42

6,000

40

47

34

43

7,000

41

48

35

43

8,000

42

49

36

44

9,000

43

50

37

45

10,000

44

50

39

46

11,000

45

51

41

47

12,000

46

52

42

48

13,000

47

52

43

49

14,000

48

53

44

50

*As the height above sea level increases, there is less oxygen per cubic foot of air. Therefore, heat input rate should be reduced at higher alti- tudes.

†Orifices available through your Bryant distributor.

Table 36—Altitude Compensation* —

581B 036-072, 581C 024-060 Low NOx Units

 

60,000 AND

120,000 BTUH

 

90,000 BTUH

 

NOMINAL INPUT

 

NOMINAL INPUT

ELEVATION

 

 

(ft)

Natural

Liquid

Natural

Liquid

Gas

Propane

Gas

Propane

 

 

Orifice

Orifice

Orifice

Orifice

 

Size†

Size†

Size

Size†

0-2,000

38

45

32

42

2,000

40

47

33

43

3,000

41

48

35

43

4,000

42

49

36

44

5,000

43

49

37

45

6,000

43

50

38

45

7,000

44

50

39

46

8,000

45

51

41

47

9,000

46

52

42

48

10,000

47

52

43

49

11,000

48

53

44

50

12,000

49

53

44

51

13,000

50

54

46

52

14,000

51

54

47

52

*As the height above sea level increases, there is less oxygen per cubic foot of air. Therefore, the input rate should be reduced at higher alti- tudes.

†Orifices are available through your local Bryant distributor.

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Contents Installation Instructions Field Fabricate Ductwork Install External Trap for Condensate DrainProvide Unit Support Rig and Place UnitRoof Curb Details Install Flue Hood Install Gas PipingRoof Curb Alignment 581B 036-072 Base Unit Dimensions 581C 024-060 Base Unit Dimensions Heat Anticipator Settings Field Power SupplyField Control Wiring Make Electrical ConnectionsPhysical Data 581B Base Unit 581BUnit Size 581B Physical Data 581C Base Unit 581CUnit Size 581C Power Wiring Connections Electrical Data 581C 581C024---060Electrical Data 581B Perfect Humidity Adaptive Dehumidification System Adjust Factory-Installed OptionsAssembly Manual Outdoor DamperTypical Perfect Humidity t Adaptive Dehumidification System Outdoor-Air Damper With Hood Attached Temperature F Supply Air Temperature SAT SensorSupply Air Sensor Temperature Resistance Values Outdoor Air Lockout SensorEconomi$er IV Sensor Usage Economi$er IV Control ModesOutdoor Dry Bulb Changeover Differential Dry Bulb ControlEconoMi$er IV Wiring Exhaust Set Point Adjustment Minimum Position ControlDamper Movement ThermostatsDemand Controlled Ventilation DCV Enthalpy Changeover Set Points Dehumidification of Fresh Air with DCV Control Belt Drive MotorsCO2Sensor Standard Settings Belt Drive Motor MountingEvaporator-Fan Motor Data Standard Motor 581B Fan Rpm at Motor Pulley Setting With High-Static MotorAccessory Static Pressure Evaporator-Fan Motor Data High-Static MotorsARI Octavebands Rating Unit Weighted 581B Outdoor Sound Power Total Unit581C Outdoor Sound Power Total Unit ARI Octave Bands Unit Rating1200 Rpm Bhp1100 1300Rpm Bhp Watts 1600 Rpm Bhp WattsWatts Rpm Bhp 1200 1700Rpm Bhp Watts 1500 1642 2333 17042700 Watts Rpm Bhp 18002600 2800Bhp Watts Rpm 2700 2800 2900 3000Bhp 600 Bhp Watts 900 Watts RpmWatts Rpm Bhp 900 1700 1800 1900 2000 Bhp Watts1900 2000 2100 2200 2300 2400 2500 800 350 904 438 999 535 1087 640 1169 753 913 569 913 569 1010 715 Unit Preparation Internal WiringRefrigerant Service Ports Gas PipingCompressor Rotation CoolingMain Burners Ventilation Continuous Fan Safety ReliefHeating Operating SequenceSubcooling Mode Hot Gas Reheat ModeHeating Units With Economi$er Condenser Coil CleaningEvaporator Coil One-Row CoilsHigh Pressure Switch Condenser-Fan AdjustmentEconoMi$er IV Adjustment Loss-of-Charge SwitchLow Charge Cooling Perfect Humidity System ChargingC06142 Flue Gas Passageways 581C 3 TON Charging Chart 581C 5 TON Charging Chart Removal and Replacement of Gas Train See Limit SwitchLED Error Code Description Combustion-Air BlowerReplacement Parts OFM Unit Troubleshooting Economi$er IV TroubleshootingSymptom Cause Remedy Economi$er IV Troubleshooting CompletionLED Error Code Service Analysis LED OFFHeating Service Analysis Problem Cause RemedyCooling Service Analysis EconoMi$er IV Input/Output Logic Inputs OutputsPreliminary Information Catalog No. II581B---C---36---1