Bryant 542J manual Controls, Cooling, Units With EconoMi$er 548F036-072 and 549B036

Page 10

CONTROLS

OPERATING SEQUENCE — 548F036-120 AND 549B036-120

Cooling, Units Without Economizer — When thermostat calls for cooling, terminals G and Y1 are energized. The indoor-fan contactor (IFC), reversing valve solenoid (RVS1) and compres- sor contactor no. 1 (C1) are energized and indoor-fan motor, compressor no. 1, and outdoor fans start. The outdoor-fan motor(s) run continuously while unit is cooling. On 548F090- 120 units, if the thermostat calls for a second stage of cooling by energizing Y2, compressor contactor no. 2 (C2) and revers- ing valve solenoid (RVS2) are energized and compressor no. 2 starts.

Heating, Units Without Economizer (548F036-072 and 549B036-072) — Set system switch at AUTO. or HEAT position. Set thermostat at desired temperature.

When the thermostat calls for heat, the IFC, outdoor-fan con- tactor (OFC), and compressor contactor are energized. The RVS is deenergized and switches position, and the indoor fan, outdoor fan, and compressor are energized.

If the thermostat calls for a second stage of heat, the heater contactor (HC) is energized and starts the electric heaters.

When the space temperature approaches the heating tem- perature set point, heating stages cycle off. The reversing valve solenoid is reenergized.

Heating, Units Without Economizer (548F090-120 and 549B090,120) — Upon a request for heating from the space thermostat, terminal W1 will be energized with 24 v. The IFC, outdoor-fan contactor (OFC), C1, and C2 will be energized. The reversing valves switch position and the indoor fan, outdoor fan, compressor no. 1, and compressor no. 2 are energized.

If the space temperature continues to fall while W1 is ener- gized, W2 will be energized with 24 v, and the heater contac- tor(s) (HC) will be energized, which will energize the electric heater(s).

When the space thermostat is satisfied, W2 will be deen- ergized first, and the electric heater(s) will be deenergized.

Upon a further rise in space temperature, W1 will be deener- gized, and the reversing valve solenoids (RVS1 and RVS2) will be energized.

Cooling, Units With EconoMi$er (548F036-072 and 549B036-

072)— When the outdoor-air temperature (OAT) is above the ECON SP set point and the room thermostat calls for Stage 1 cooling (R to G + Y1), the indoor-fan motor (IFM) is energized and the EconoMi$er damper modulates to minimum position. The compressor contactor is energized to start the compressor and outdoor-fan motor (OFM) and RVS1 (reversing valve sole- noid). After the thermostat is satisfied, the damper modulates to the fully closed position when the IFM is deenergized.

When the OAT is below the ECON SP setting and the room thermostat calls for Stage 1 cooling (R to G + Y1), the EconoMi$er modulates to the minimum position when the IFM is energized. The EconoMi$er provides Stage 1 of cooling by modulating the return and outdoor-air dampers to maintain a 55 F supply air set point. If the supply-air temperature (SAT) is greater than 57 F, the EconoMi$er modulates open, allowing a greater amount of outdoor air to enter the unit. If the SAT drops below 53 F, the outdoor air damper modulates closed to reduce the amount of outdoor air. When the SAT is between 53 and 57 F, the EconoMi$er maintains its position.

If outdoor-air alone cannot satisfy the cooling requirements of the conditioned space, and the OAT is above the MECH CLG LOCKOUT set point, the EconoMi$er integrates free cooling

with mechanical cooling. This is accomplished by the strategies below.

NOTE: Compressor has a 2-minute Minimum On, Minimum Off, and Interstage delay timer.

1.If Y1 is energized, and the room thermostat calls for Y2 (2-stage thermostat), the compressor and OFM are ener- gized. The EconoMi$er damper is maintained at its current position.

2.If Y1 is energized for more than 20 minutes, and Y2 is not energized (whether or not a 2-stage thermostat is used), the compressor and OFM are energized. The EconoMi$er damper is maintained at its current position.

3.If Y1 is energized, and the compressor is already energized (see Step 2) and the room thermostat calls for Y2, the com- pressor continues to operate.

4.If compressor is energized and the thermostat is satisfied, the compressor, the OFM, and IFM are deenergized and the EconoMi$er modulates closed.

When the OAT is below the MECH CLG LOCKOUT set point, the compressors remain off.

Cooling, Units With EconoMi$er (548F090-120 and 549B090,120) — When the outdoor-air temperature (OAT) is above the ECON SP set point and the room thermostat calls for Stage 1 cooling (R to G + Y1), the indoor-fan motor (IFM) is energized and the EconoMi$er damper modulates to mini- mum position. The compressor contactor is energized to start the compressor and outdoor-fan motor (OFM) and RVS1 (reversing valve solenoid). After the thermostat is satisfied, the damper modulates to the fully closed position when the IFM is deenergized.

When the OAT is below the ECON SP setting and the room thermostat calls for Stage 1 cooling (R to G + Y1), the EconoMi$er modulates to the minimum position when the IFM is energized. The EconoMi$er provides Stage 1 of cooling by modulating the return and outdoor-air dampers to maintain a 55 F supply air set point. If the supply-air temperature (SAT) is greater than 57 F, the EconoMi$er modulates open, allowing a greater amount of outdoor air to enter the unit. If the SAT drops below 53 F, the outdoor air damper modulates closed to reduce the amount of outdoor air. When the SAT is between 53 and 57 F, the EconoMi$er maintains its position.

If outdoor-air alone cannot satisfy the cooling requirements of the conditioned space, and the OAT is above the MECH CLG LOCKOUT set point, the EconoMi$er integrates free cooling with mechanical cooling. This is accomplished by the strategies below.

NOTE: Compressors have a 2-minute Minimum On, Minimum Off, and Interstage delay timer.

1.If Y1 is energized, and the room thermostat calls for Y2 (2-stage thermostat), compressor no. 1 and OFM are ener- gized. The EconoMi$er damper is maintained at its current position.

2.If Y1 is energized for more than 20 minutes, and Y2 is not energized (whether or not a 2-stage thermostat is used), compressor no. 1 and OFM are energized. The EconoMi$er damper is maintained at its current position.

3.If Y1 is energized, and compressor no. 1 is already ener- gized (see Step 2) and the room thermostat calls for Y2, compressor no. 1 continues to operate. If Y2 remains energized for more than 20 minutes, compressor no. 2 is energized.

10

Page 9 Page 11
Image 10
Page 9 Page 11
Contents 542J150,180 FEATURES/BENEFITS548F036-072 548F090-120 549B036-072 549B090-120 Table of Contents Integrated ECONOMI$ERS and Outdoor AIR Service OptionsINDOOR-AIR Quality Begins with Bryant Rooftops Options and Accessories Option ACCESSORY†LOW Ambient Controls Options and AccessoriesBarometric RELIEF/POWER Exhaust Emergency Heat Control PackageElectric Heaters DURA-SHIELDOUTDOOR Coil OptionsOutdoor Coil Protection Applications ECONOMI$ER Microprocessor ControllerConvenience Outlet Glycol Coil 150,180 onlyCompressor Hinged Panel Option Hail GuardBryant Commercial Programmable Thermostat Control BOX Hinged Panel OptionOptions and Accessories Controls Cooling, Units With EconoMi$er 548F036-072 and 549B036Controls Sequence of Operation 542J150,180Controls Typical Smoke Control/Fire Shutdown Wiring 542J150,180 Operating ModesApplication Data Concentric Duct Distribution 542J150,180 Application DataConcentric Duct Details 542J150,180 Horizontal Discharge Ducting 548F036-120 and 549B036-120 Typical Piping and WiringVertical Discharge Ducting 548F036-120 and 549B036-120 Typical Piping and Wiring ODS Model Number Model Number Nomenclature 548F UnitsARI* Capacity Ratings Physical Data 548F036-072Physical Data 548F090-120072-548F036 Base Unit Dimensions Roof Curb Unit Size Accessory CRRFCURB001A00 Accessory DimensionsConnector ALT GAS Power Control PKG. Accy Drain Hole CRRFCURB002A00Accessory Dimensions II Select Unit Based on Required Cooling Capacity Selection Procedure with 548F048 ExampleDetermine Cooling and Heating Loads AT Design Conditions III Select Electric HeatSHC Performance DataCooling Capacities Entering AIR DRY-BULB Temp FCooling Capacities Performance DataEntering AIR DRY-BULB Temp F Bypass 4100/0.18 4700/0.21 Air Temperature Entering Outdoor Coil FInstantaneous and Integrated Heating Ratings UnderInstantaneous and Integrated Heating Ratings 3000 Cap 1800 Cap2400 Cap 2600 Cap3600 Cap CfmStandard Air 2400 Cap 4000 CapESP FAN Performance Vertical Discharge Units548F036 3 Tons Standard Motor Direct Drive 548F036 3 Tons Alternate Motor Belt DriveFAN Performance Vertical Discharge Units 548F048 4 Tons Alternate Motor Belt DriveESP 548F060 5 Tons Standard Motor Direct Drive548F060 5 Tons Alternate Motor Belt Drive 548F060 5 Tons HIGH-STATIC Motor Belt Drive 548F072 6 Tons HIGH-STATIC Motor Belt Drive 518 562 Rpm Bhp Watts511 539 534 607548F090 71/2 Tons HIGH-STATIC Motor Belt Drive 548F102 8 TONS* Standard Motor Belt Drive 548F102 81/2 Tons HIGH-STATIC Motor Belt Drive 963 2651 548F120 10 TonsRpm Bhp 973 2782Airflow Low Speed High Speed Cfm 208 230, 460, 575 FAN Performance Horizontal Discharge UnitsCfm Rpm Bhp Watts FAN Performance Horizontal Discharge Units 548F048 4 Tons Alternate Motor Belt Drive729 388 787 450 895 593 658 276 722 337 840 470693 327 754 388 867 531 765 460 821 521548F060 5 Tons HIGH-STATIC Motor Belt Drive 548F072 6 Tons Standard Motor Belt Drive1900 982 779 1084 932 1160 1006 Rpm Bhp Watts 1800 942 700 1047 835 1139 9561031 1276 11142400 482 524 569 684 Rpm Bhp Watts 2250 465 473 554 6302300 471 487 559 646 2500 494 554 581 7232400 528 600 606 779 674 965 738 1199 795 Rpm Bhp Watts 2250 507 547 586 700 658 891 722 1097 7832300 513 562 592 723 663 916 727 1131 786 2500 542 648 619 835 686 1022 748 1258 806548F102 81/2 Tons Standard Motor Belt Drive 3100 636 1006 704 1241 764 1499 818 1744 Rpm Bhp Watts 2550 669 627 867 692 1056 754 1292 8122900 604 867 676 1089 737 1318 794 1560 848 3200 652 1089 718 1327 778 1595 831 1849General Notes for FAN Performance Tables FAN RPM AT Motor Pulley SETTINGS* 548F036-120 ACCESSORY/FIOP Static PRESSURE* in. wg 548F036-072ACCESSORY/FIOP Static PRESSURE* in. wg 548F090-120 Component CFMPower Requirements Optional Power ExhaustEconoMi$er Barometric Relief Damper Characteristics Mocp SizeHeater Rating Electric Heating CapacitiesMultiplication Factors DistributionOperating Watts AMP Draw Efficiency % INDOOR-FAN Motor Performance 548F UnitsUnit INDOOR-FAN Maximum Acceptable Motor 090Electrical Data Units Without Electrical Convenience OutletElectrical Data Units Without Electrical Convenience OutletOFM IFM SIZE† Voltage Compressor Electric Heat Power Supply DisconnectNominal IFM Range Tons81/2 Tons Units with Electrical Convenience Outlet Units with Electrical Convenience Outlet 40.4 45†† 195/195 13.6/15.6 57.4 59.9 60†† 208/211 Voltage Compressor Electric Power Supply Disconnect Unbalanced 3-Phase Supply Voltage Typical Wiring Schematic SW4Typical Wiring Schematic Outdoor-Fan Motor549B036-060 Model Number Nomenclature549B E X 090 000 AA 549B072-120549B036-072 Base Unit 549B549B090,120 Base Unit Dimensions 549B036-120 549B090,120 549B036-072 ′-2 ″′-0 ″ ″ 19 NPT 827 583 44.5 12.7 NPT Capacity Selection Procedure with 549B048 ExampleII Select Unit Based on Required Cooling Enter Cooling Capacities table at outdoor entering temperEntering AIR DRY-BULB Temp F Bypass SHCFactor 549B090 71/2 Tons Temp F 549B072 6 Tons Temp F1800/0.06 2100/0.066 2400/0.071 3000/0.088 Entering Air 2250/0.12 3000/0.15 3750/0.18 Entering Air900 Cap 549B036 3 Tons549B048 4 Tons 549B072 6 Tons 549B060 5 Tons2100 Cap 549B090 71/2 Tons Temperature Air Entering Outdoor Coil F db at 70% rh549B120 10 Tons 709 782 835 900 937 1100 Rpm Bhp 900673 736 805 865 911 1000 746 806 867 929 964 1200549B060 5 Tons Standard Motor Belt Drive 549B072 6 Tons Standard Motor Belt Drive549B090 71/2 Tons Standard Motor Belt Drive 549B120 10 Tons Standard Motor Belt Drive 670 758 812 863 914 1200 584 656 734 818 875 1000627 738 800 848 895 1100 710 780 840 889 938 13001372 Cfm Rpm Bhp 1500 1108 1187 1202 10792100 1252 1320 1388 1448 Airflow External Static Pressure in. wg635 699 Rpm Bhp 2250630 695 645 708615 679 734 787 595 657 716 770605 667 725 779 625 691 744 796FAN RPM AT Motor Pulley SETTINGS* 549B036-120 ACCESSORY/FIOP Static PRESSURE* in. wg 549B036-072ACCESSORY/FIOP Static PRESSURE* in. wg 549B090,120 549B 036INDOOR-FAN Motor Data 549B036-120 Outdoor Sound Power Total Unit Electric Heating CapacitiesRLA LRA Nominal Voltage Electric Power Minimum Unit Compressor OFMDisconnect Voltage Range Heat Supply FLA MCA Mocp LRAPh-Hz Min Max Nominal Voltage Electric Power Minimum Unit CompressorIFM Disconnect Voltage Range Heat Supply RLA LRA FLA30.4 106/106 43.0 247/247 10.4 21.7 25.0 70.1 74.3 269/272 Typical Wiring Schematic Potter & Brunfield Amps MustRating HFG. PT. no Trip RVSPart 1 General Guide Specifications 548F and 549B036-120 UnitsPart 2 Products Guide Specifications 548F and 549B036-120 Units Guide Specifications 548F and 549B036-120 Units 100 Model Number Nomenclature 542J150,180 Units 542J E X 150 000 AB H B542J150,180 Units Weight Distribution and Center of GravityUnit Weight Weight of Corner Dimensions Cooling HEATING-HIGH Temp HEATING-LOW Temp Sound UnitALT Unit 542JSTD STD ALTUnit Weight of Corner Unit Maximum Shipping WeightUnit Dimensions 542J 150 1895 860 180 2205 1000CRRFCURB011A00 DIMENSIONS* degrees and inchesPKG NO. REF Curb Description Height CRRFCURB010A00 CRRFCURB012A00Convenience Outlet 542J150,180 Horizontal Adapter Installation 542J150,180Accessory Curb Description HeightPower Exhaust 542J150,180 Non-Fused Disconnect 542J150,180Selection Procedure with 542J180 Example Capacity TC of 180,800 Btuh, a sensible heat capacity542J150 Temp F Air Entering Indoor Coil Cfm/BF 542J1805625 Integrated Heating CapacitiesCFM General Notes for FAN Performance Tables Fan Performance Using Accessory Power Exhaust ACCESSORY/FIOP Static PRESSURE* in. wg 542J150,180FAN RPM AT Motor Pulley SETTINGS* 542J150,180 ACCESSORY/FIOP Unit Size Unit Voltage CFMGlycol Coil Data Electric Heating Capacities 542J150,180Glycol Coil Ratings INDOOR-FAN Motor Performance 542J150,180 542J180, 460-3-60 Shown LPS BKR W/ATLOR CAPOptional Non-Fused Disconnect 542J150,180 Part 1 General Guide Specifications 542J150,180 UnitsPart 2 Products Guide Specifications 542J150,180 Units 120 121 Index 95,96
Related manuals
Manual 4 pages 35.17 Kb

549B, 548F, 542J specifications

Bryant 542J is a high-efficiency gas furnace that stands out for its reliability and advanced heating technologies. Designed to deliver consistent warmth and comfort in residential settings, it combines innovative engineering with energy-efficient features.

One of the key characteristics of the Bryant 542J is its two-stage heating capability. This means that the furnace can adjust its heat output according to the heating demands of your home. During milder weather, it operates at a lower stage, consuming less energy while still maintaining a comfortable environment. When the temperatures drop, the furnace shifts to its higher capacity, providing the necessary warmth efficiently. This not only enhances comfort but also contributes to lower energy bills.

In addition to its two-stage operation, the Bryant 542J also incorporates a variable-speed blower motor. This technology allows the furnace to adjust the airflow depending on the heating requirements, ensuring an even distribution of warm air throughout the home. The variable-speed blower also operates more quietly than conventional fixed-speed motors, creating a serene indoor environment.

Energy efficiency is a hallmark of the Bryant 542J, boasting an Annual Fuel Utilization Efficiency (AFUE) rating of up to 96.5%. This impressive rating means that a significant portion of the energy consumed is effectively converted into usable heat, resulting in substantial savings on heating costs over time. Furthermore, the furnace is equipped with a sealed combustion system that draws air from outside the home, minimizing energy waste and improving indoor air quality.

Diagnostic features are another highlight of the Bryant 542J, which come equipped with SmartEvap technology. This allows the unit to self-diagnose potential issues, providing homeowners with peace of mind and simplifying maintenance procedures.

Durability is also a key feature of the Bryant 542J. It is constructed with high-quality materials designed to withstand harsh winter conditions, ensuring a long lifespan and reliable performance. Its compact design also allows for flexible installation, making it suitable for various residential layouts.

In summary, the Bryant 542J is more than just a gas furnace; it is a sophisticated heating solution that combines efficiency, comfort, and reliability. With features such as two-stage heating, a variable-speed blower, high AFUE ratings, and advanced diagnostics, it is an excellent choice for homeowners seeking an efficient and effective heating system.
Top Page Image Contents