Bryant 574B manual Controls, Operating Sequence

Page 24

CONTROLS

OPERATING SEQUENCE

Heating — On a call for heating, terminal “W” of the thermostat is energized, starting the induced-draft motor. When the hall- effect sensor on the induced-draft motor senses that it has reached the required speed, the burner sequence begins. This function is performed by the integrated gas control (IGC). The evaporator fan motor is energized 45 seconds after flame is es- tablished. When the thermostat is satisfied and “W” is de- energized, the burners stop firing and the evaporator fan motor shuts off after a 45-second time-off delay.

Cooling — When the room temperature rises to a point that is slightly above the cooling control setting of the thermostat, the thermostat completes the circuit between thermostat terminal R to terminals Y and G. These completed circuits through the ther- mostat connect contactor coil (C) (through unit wire Y) and blow- er relay coil (BR) (through unit wire G) across the 24-v secondary of transformer (TRAN).

The normally open contacts of energized contactor (C) close and complete the circuit through compressor motor (COMP) to con- denser (outdoor) fan motor (OFM). Both motors start instantly.

The indoor blower will cycle on and off with a call for cooling per the on/off delay profile selected on the easy select™ circuit board.

NOTE: Once the compressor has started and then has stopped, it should not be started again until 5 minutes have elapsed.

The cooling cycle remains “on” until the room temperature drops to a point that is slightly below the cooling control setting of the room thermostat. At this point, the thermostat “breaks” the circuit between thermostat terminal R to terminals Y and G. These open circuits de-energize contactor coil C and relay coil BR. The condenser and compressor motors stop. After a 30-second de- lay, the blower motor stops. The unit is in a “standby” condition, waiting for the next “call for cooling” from the room thermostat.

The indoor blower operation with a call for fan operation (G) in cooling mode will perform by the on/off delay profile selected on the Easy Select™ circuit board.

—24—

Page 23 Page 25
Image 24
Page 23 Page 25
Contents FEATURES/BENEFITS Unit 574BEfficient Operation DURABLE, Dependable ComponentsHigh and LOW Pressure Switches provide added reli Model Number NomenclatureTable of Contents ARI* Capacities Cooling Capacities and EfficienciesARI* Capacities Heating Capacities and EfficienciesOutdoor Sound Octave Band Data Decibels LwA Range FPhysical Data Unit Size 574BPhysical Data Options and Accessories Factory-installed optionsFilter Rack Manual Outside Air Damper Base Unit Dimensions 574B024-036 Electrical Unit Weight Unit Height Center of GravityCharacteristics Base Unit Dimensions 574B042-060 Required Clearance for Operation and ServicingRequired Clearance to Combustible Matl NEC. Required ClearancesAccessory Dimensions Roof Curb DimensionsSide View Unit Size ODS Order Number574B Corner Weights Selection Procedure with ExampleSelect Unit That Corresponds to Power Source Available II Select Unit Based on Required Cooling Capacity574B024 Cooling Performance Table SHC574B030 Cooling Performance Table Performance Data Cooling Capacities574B036 Cooling Performance Table 574B042 Cooling Performance Table574B048 Cooling Performance Table 574B060 Cooling Performance TableSHC ECMFilter Pressure Drop In. wg Filter Size CFM574B Cooling DRY Coil ECM AIRFLOW-SMALL Cabinet 574B Cooling DRY Coil ECM AIRFLOW-LARGE Cabinet574B Heating ECM AIRFLOW-SMALL Cabinet 574B Heating ECM AIRFLOW-LARGE Cabinet574B ECM AIR Flow VS. Temperature Rise Chart Performance DataHigh Altitude Compensation 574B ECM WET Coil Pressure DropTypical Piping and Wiring Application Data Electrical Data 574B Standard Electrical Data Typical Wiring SCHEMATIC-208/230-1-60 Shown Typical Wiring SCHEMATIC-208/230-3-60 Shown Controls Operating SequencePage Page Guide Specifications Part 1 GeneralPart 2 Products Guide Specifications

574B specifications

The Bryant 574B is a remarkable air conditioning unit renowned for its efficient cooling performance and advanced technology. Designed for both residential and light commercial applications, this model stands out in the market for its durability and energy efficiency.

One of the primary features of the Bryant 574B is its wide capacity range. This unit is designed to cater to various room sizes, allowing homeowners to select an appropriate model that best suits their cooling needs. The 574B series comes with efficient cooling capacities, ensuring that indoor spaces remain comfortable even during the hottest summer months.

In terms of technology, the Bryant 574B integrates advanced refrigeration systems coupled with environmentally conscious refrigerants. The unit utilizes R-410A refrigerant, which is known for its efficiency and energy conservation properties, making it a more environmentally friendly choice compared to older models that used R-22 refrigerant. This transitions not only help in achieving better energy ratings but also align with modern regulations concerning refrigerants.

Another notable characteristic of the Bryant 574B is its impressive Seasonal Energy Efficiency Ratio (SEER). A higher SEER rating translates to lower energy consumption, which is a significant advantage for homeowners looking to minimize their electricity bills. The 574B boasts a SEER rating that meets or exceeds the standards set by the Department of Energy, showcasing its commitment to energy efficiency.

Durability is also a hallmark of the Bryant 574B air conditioner. Its construction includes a robust cabinet designed to withstand harsh weather conditions, ensuring longevity and consistent performance. The unit is equipped with a protective coating to prevent rust and corrosion, further extending its lifespan.

Moreover, the Bryant 574B features easy installation and maintenance. The design allows for straightforward setup, which can significantly reduce installation time. Additionally, the unit comes with an accessible maintenance panel, making routine checks and servicing hassle-free.

In summary, the Bryant 574B is a high-performing air conditioning system characterized by its efficiency, environmentally friendly design, and durability. With its advanced technologies and user-friendly features, it is a reliable choice for those seeking comfort and savings in their cooling systems.
Top Page Image Contents