Bryant 577D----A installation instructions Final Checks

Page 35

exists, the thermal protector is open. The control de-energizes the compressor contactor for 15 minutes, but continues to operate the outdoor fan. The control Status LED will flash the appropriate code shown in Table 4. After 15 minutes, with a call for low or high stage cooling, the compressor contactor is energized. If the thermal protector has not re-set, the outdoor fan is turned off. If the call for cooling continues, the control will energize the compressor contactor every 15 minutes. If the thermal protector closes (at the next 15 minute interval), check the unit will resume operation.

If the thermal cutout trips for three consecutive cycles, then unit operation is locked out for 4 hours and the appropriate fault code is displayed.

NO 230V AT COMPRESSOR

If the compressor voltage is not sensed when the compressor should be starting, the contactor may be stuck open or there is a wiring error. The control will flash the appropriate fault code. Check the contactor and control box wiring.

TROUBLESHOOTING UNIT FOR PROPER SWITCHING BETWEEN LOW & HIGH STAGES

Check the suction pressures at the service valves. Suction pressure should be reduced by 3-10% when switching from low to high capacity.

NOTE: The liquid pressures are very similar between low and high stage operation, so liquid pressure should not be used for troubleshooting.

Compressor current should increase 20-45% when switching from low to high stage. The compressor solenoid, when energized in high stage, should measure 24vac.

COMPRESSOR INTERNAL RELIEF

The compressor is protected by an internal pressure relief (IPR) which relieves discharge gas into compressor shell when differential between suction and discharge pressures exceeds 550 - 625 psi. The compressor is also protected by an internal overload attached to motor windings.

TEMPERATURE THERMISTORS

Thermistors are electronic devices which sense temperature. As the temperature increases, the resistance decreases. Thermistors are used to sense outdoor ambient (OAT) and coil temperature (OCT). Refer to Fig. 28 for resistance values versus temperature. See Fig. 29 for OCT location.

If the outdoor ambient or coil thermistor should fail, the HP/AC control will flash the appropriate fault code (See Table 4).

IMPORTANT: Coil thermistor is factory mounted. Check to insure thermistor is mounted properly. Outdoor air thermistor (OAT) is field mounted and connected. Verify that the OAT has been properly installed.

THERMISTOR CURVE

 

90

(KOHMS)

80

70

 

60

RESISTANCE

50

20

 

40

 

30

10

0

0

20

40

60

80

100

120

 

 

TEMPERATURE (DEG. F)

 

 

A91431

Fig. 28 - Resistance Values Versus Temperature

THERMISTOR SENSOR COMPARISON

The control continuously monitors and compares the outdoor air temperature sensor and outdoor coil temperature sensor to ensure proper operating conditions. The comparison is:

S In cooling mode, if the outdoor air sensor indicates ≥ 10 _F (5.5_C) warmer than the coil sensor (or) the outdoor air sensor indicates ≥ 20_F (11.0_C) cooler than the coil sensor, the sensors are out of range.

SIn heating if the outdoor air sensor indicates ≥ 35_F (19.3_C) warmer than the coil sensor (or) the outdoor air sensor indicates ≥ 10_F (5.5_C) cooler than the coil sensor, the sensors are out of range.

If the sensors are out of range, the control will flash the appropriate

 

fault code as shown in Table 4.

 

The thermistor comparison is not performed during low ambient

 

 

cooling operation.

 

FAILED THERMISTOR DEFAULT OPERATION

A

Factory defaults have been provided in the event of failure of

--

--

outdoor air thermistor and/or coil thermistor.

577D

If the OAT sensor should fail, low ambient cooling will not be

 

allowed and the one-minute outdoor fan off delay will not occur.

 

Defrost will be initiated based on coil temperature and time.

 

If the OCT sensor should fail, low ambient cooling will not be

 

 

allowed. Defrost will occur at each time interval during heating

 

operation, but will terminate after 5 minutes.

 

If there is a thermistor out of range error, defrost will occur at each

 

time interval during heating operation, but will terminate after 5

 

minutes.

 

Refer to the Troubleshooting Chart (Table 9 and 10) for additional

 

troubleshooting information.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A06311

Fig. 29 - Outdoor Coil Thermistor (OCT) Attachment

FINAL CHECKS

IMPORTANT: Before leaving job, be sure to do the following:

1.Ensure that all wiring is routed away from tubing and sheet metal edges to prevent rub-through or wire pinching.

2.Ensure that all wiring and tubing is secure in unit before adding panels and covers. Securely fasten all panels and covers.

3.Tighten service valve stem caps to 1/2-turn past finger tight.

4.Leave Users Manual with owner. Explain system operation and periodic maintenance requirements outlined in manual.

5.Fill out Start-Up Checklist located at the back of this manual and place in customer file.

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Contents Table of Contents Installation InstructionsCheck Equipment Safety ConsiderationsReceiving and Installation IntroductionUnit Falling Hazard Provide ClearancesRig and Place Unit UNIT/STRUCTURAL Damage HazardCPRFCURB012A00 SizeCPRFCURB010A00 CPRFCURB011A00577D--A24-30 Unit Dimensions 577D--A36-60 Unit Dimensions Physical Data Unit 577D--A Indoor FAN Physical Data Con’t Unit 577D--APersonal Injury Hazard Select and Install DuctworkCabinet Model Rigging Weight Supply and Return Duct Opening Provide for Condensate DisposalCarbon Monoxide Poisoning Hazard Install Flue HoodInstall Gas Piping Unit Component Damage Hazard Install Electrical ConnectionsFire or Explosion Hazard Humidifier Connections Outdoor Air Temperature Sensor OATElectronic Air Cleaner Maximum Gas Flow CapacityTypical Installation Control Plate FIRE, EXPLOSION, Electrical Shock and Environmental Hazard Unit Start-Up and TroubleshootingPRE-START-UP START-UPFurnace Control Troubleshooting Indoor Fan Motor Troubleshooting577D a A10217L A10219C A10219L HP/AC Control Troubleshooting Unit Operation Hazard Sequence of OperationHeat Pump/Air Conditioner Board Status Codes Air Delivery and Temperature Rise at Rated Heating InputUnit Damage Hazard Dehumidification ModeEvolution Controlled LOW Ambient Cooling Check GAS Input Natural GASCanada Fire and Unit Damage HazardU.S.A Altitude Derate Multiplier for U.S.ACheck Burner Flame Check GAS Input Propane GASCheck for Refrigerant Leaks Start-Up AdjustmentsFilter Pressure Drop Table IN. W.C Heating InputsECM Wet Coil Pressure Drop IN. W.C Cooling Charging Table-Subcooling Maintenance Outdoor Fan Inducer Pressure SwitchElectrical Controls and Wiring Outdoor Coil, Indoor Coil, and Condensate Drain PanCopeland Scroll Compressor Puron Refrigerant Pressure Switches Refrigerant CircuitRefrigerant Circuit Indoor AirflowTroubleshooting Final Checks Care and Maintenance Observe all warnings, cautions, and bold text Symptom Cause Remedy Troubleshooting Chart CoolingBurners will not ignite Troubleshooting Chart Gas Furnace OperationIII. START-UP Electrical Supply Voltage Compressor Amps START-UP ChecklistTemperatures Preliminary Information Model no

577D----A specifications

The Bryant 577D----A is a highly regarded model in the HVAC industry, representing a blend of efficiency, performance, and advanced technology. This heating and cooling unit is designed to cater to a variety of residential and light commercial applications, making it a versatile choice for consumers looking to enhance their indoor climate control systems.

One of the standout features of the Bryant 577D----A is its impressive energy efficiency rating. With a Seasonal Energy Efficiency Ratio (SEER) typically exceeding 14, this model is engineered to reduce energy consumption, helping homeowners lower their utility bills while minimizing environmental impact. The unit also employs a two-stage cooling system, which not only improves comfort by maintaining more consistent temperatures but also provides enhanced dehumidification during hotter months.

The technology used in the Bryant 577D----A is noteworthy. The unit incorporates a variable-speed compressor that adapts to the specific cooling or heating needs of the space, ensuring optimal performance at all times. This advanced feature not only contributes to energy savings but also allows for quieter operation compared to single-stage systems. The inclusion of a smart thermostat integration further enhances convenience, enabling users to manage their HVAC system remotely and optimize settings according to their schedules.

Additional characteristics of the Bryant 577D----A include a durable construction designed to withstand various environmental conditions. The cabinet is made from quality materials that protect against corrosion and other factors that could affect the unit's longevity. Furthermore, the unit operates quietly, thanks to sound-dampening technologies, which is a significant advantage for residential areas where noise can be a concern.

Maintenance is also simplified with the Bryant 577D----A, as it is equipped with self-diagnostics for easy troubleshooting. This feature alerts users to potential issues before they escalate, promoting efficient operation and prolonging the lifespan of the system.

In conclusion, the Bryant 577D----A stands out as a superior choice for those seeking reliability and efficiency in their HVAC solutions. With its energy-efficient operation, advanced technologies, and robust construction, it serves as a valuable investment for homeowners committed to comfort and sustainability.
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