Bryant 548J manual 23 09 33 Electric and Electronic Control System for Hvac

Page 69

7.Shall have an LED display independently showing the status of serial communication, running, errors, power, all digital outputs, and all analog inputs.

8.Shall accept the following inputs: space temperature, setpoint adjustment, outdoor air temperature, indoor air qu- ality, outdoor air quality, compressor lock-out, fire shutdown, enthalpy switch, and fan status/filter status/humid- ity/remote occupancy.

9.Shall provide the following outputs: economizer, fan, cooling stage 1, cooling stage 2, heat stage 1, heat stage 2, heat stage 3/ exhaust/ reversing valve.

10.Shall have built-in surge protection circuitry through solid state polyswitches. Polyswitches shall be used on in- coming power and network connections. Polyswitches will return to normal when the “trip” condition clears.

11.Shall have a battery back-up capable of a minimum of 10,000 hours of data and time clock retention during power outages.

12.Shall have built-in support for Bryant technician tool.

13.Shall include an EIA-485 protocol communication port, an access port for connection of either a computer or a Bryant technician tool, an EIA-485 port for network communication to intelligent space sensors and displays, and a port to connect an optional LonWorks communications card.

14.Software upgrades will be accomplished by either local or remote download. No software upgrades through chip replacements are allowed.

23 09 33 Electric and Electronic Control System for HVAC

23 09 33.13 Decentralized, Rooftop Units:

23 09 33.13.A. General:

1.Shall be complete with self-contained low-voltage control circuit protected by a resettable circuit breaker on the 24-v transformer side. Transformer shall have 75VA capability.

2.Shall utilize color-coded wiring.

3.Shall include a central control terminal board to conveniently and safely provide connection points for vital con- trol functions such as: smoke detectors, phase monitor, economizer, thermostat, DDC control options, loss of charge, freeze switch, high pressure switches.

4.Unit shall include a minimum of one 8-pin screw terminal connection board for connection of control wiring.

5.Shall include integrated defrost system to prevent excessive frost accumulation during heating duty, and shall be controlled as follows:

a.Defrost shall be initiated on the basis of time and coil temperature.

b.A 30,60,90,120 minute timer shall activate the defrost cycle only if the coil temperature is low enough to indic- ate a heavy frost condition.

c.Defrost cycle shall terminate when defrost thermostat are satisfied and shall have a positive termination time of 10 minutes.

6.Defrost system shall also include:

a.Defrost Cycle Indicator LED.

b.Dip switch selectable defrost time between 30,60,90 and 120 minutes. Factory set at 30 minutes.

c.Molded plug connection to insure proper connection.

23 09 33.23.B. Safeties:

1.Compressor over-temperature, over current.

2.Loss of charge switch.

a.Units with 2 compressors shall have different sized connectors for the circuit 1 and circuit 2 low and high pres- sure switches. They shall physically prevent the cross-wiring of the safety switches between circuits 1 and 2.

b.Loss of charge switch shall use different color wire than the high pressure switch. The purpose is to assist the installer and service technician to correctly wire and or troubleshoot the rooftop unit.

3.High-pressure switch.

a.Units with 2 compressors shall have different sized connectors for the circuit 1 and circuit 2 low and high pres- sure switches. They shall physically prevent the cross-wiring of the safety switches between circuits 1 and 2.

b.High pressure switch shall use different color wire than the low pressure switch. The purpose is to assist the installer and service technician to correctly wire and or troubleshoot the rooftop unit.

4.Freeze protection thermostat, evaporator coil.

5.Automatic reset, motor thermal overload protector.

23 09 93 Sequence of Operations for HVAC Controls

23 09 93.13 Decentralized, Rooftop Units:

23 09 93.13 INSERT SEQUENCE OF OPERATION

548J

69

Page 68 Page 70
Image 69
Page 68 Page 70
Contents Product Data Table of Contents Features and Benefits Model Number Nomenclature FACTORY-INSTALLED Options and FIELD-INSTALLED Accessories Factory Options AND/OR AccessoriesOption Accessory FieldPower Exhaust Pressure Relief Convenience Outlet powered or un-poweredFilter or Fan Status Switches Economizer dry-bulb or enthalpyAlternate Motors and Drives Motormaster Head Pressure ControllerThru-the-Base Connections Electric HeatersARI Cooling Rating Tables Sound Performance Table Minimum Maximum Airflows Electric HeatTons Physical Data8.5 Tons 548J*08 548J*09Motor Frame Size Fan Qty / Type Single Point KIT Part Number Crsinglexxxxxx Unit Electric Heat Electrical DataElectric Heater NOM APP Part Number PWR Type With Pwrd C.OCont. Electric Heat Electrical Data 208/230Electric Drive X13 5 speed/torque motor 105A00 16.0 12.0/14.7 038A00 Without P.E With P.E CrheaterxxxxxxCool Cont. Electric Heat Electrical Data Tons575 460 115A00 33.0 30.3 050A00Dimensions 548J Weights & DimensionsUnit disconnect is mounted on panel Dimension Condition610 356 548J*04-07AC08679 C08680 356 Application Data Selection Procedure with 548J*07 Example Cooling Capacities Ambient Temperature548J*04 105 115 EA dB 900548J*05 105 115 EA dB 12001400 1500 548J*06 105 115 EA dB2250 25001800 548J*07 105 115 EA dB2100 24002625 548J*08 105 115 EA dB3375 37502550 548J*09 105 115 EA dB2975 3400Heating Capacities Temperature AIR Entering Outdoor Coil F db at 70% rh548J*04 ReturnHeating Capacity 548J*08 Heating Capacity TonsGeneral fan performance notes Static Pressure Adders Factory Options and/or Accessories548J*04 Electric DRIVE, X13 MOTOR, 3 TON Horizontal Supply FAN Performance548J*04 Electric DRIVE, X13 MOTOR, 3 TON Vertical Supply Speed Torque CFM ESP BHP548J*05 Electric DRIVE, X13 MOTOR, 4 TON Horizontal Supply 548J*05 Electric DRIVE, X13 MOTOR, 4 TON Vertical Supply1200 1300 1400 1500 1600 1700 1800 1900 2000 548J*06 Electric DRIVE, X13 MOTOR, 5 TON Horizontal Supply 548J*06 Electric DRIVE, X13 MOTOR, 5 TON Vertical Supply1500 1625 1750 1875 2000 2125 2250 2375 2500 TON Horizontal Supply 548J*05 Available External Static Pressure IN. WG CFM RPM BHPCFM RPM BHP 548J*06 548J*07 1800 9271800 907 2250 509 548J*082250 788 847 2250 5282550 468 546 548J*092550 806 863 2550 495 570Unit MOTOR/DRIVE Combo Motor Pulley Turns Open Pulley Adjustment2000 1000 ECONOMIZER, Barometric Relief and PE Performance548J*04 Stage Cooling Electrical Information548J*05 Stage Cooling 548J*06 Stage Cooling548J*08 Stage Cooling Tons 548J*07 Stage Cooling548J*09 Stage Cooling Tons Range RLA LRAELEC. HTR MCA/MOCP Determination Without C.O. or Unpwrd C.OUnit IFM Without P.E With P.E Type FLA DISC. SizeELEC. HTR Unit Cont. MCA/MOCP Determination Without C.O. or Unpwrd C.OType FLA MCA76/82 70/7479/84 46/48High Unit IFM Type NOM STD MEDSee FLA DISC. Size MCA Mocp LRA65/68 41.5 19778/84 43.8 23469/72 45.7 20582/88 48.0 242ELEC. HTR With Pwrd C.O Unit IFM Without P.E With P.E MCA/MOCP Determination with Pwrd C.O111 Cont. MCA/MOCP Determination with Pwrd C.O113 10833.3 46.520.2 29.2Electric Heater With Pwrd C.O Without P.E With P.E Electric Heater With Pwrd C.O Unit IFM Without P.E With P.E 74/78 50.5 21088/93 52.8 247Stage Cooling Typical Power Diagram Typical Wiring DiagramsC09065 Multi-Protocol Option Diagram Stage Typical Wiring Diagram C09064 Sequence of Operation Continuous air circulation Automatic changeoverCycle-LOCprotection Emergency heatHvac Guide Specifications Guide Specifications 548J*04-0923 09 93 Sequence of Operations for Hvac Controls 23 09 33 Electric and Electronic Control System for Hvac23 81 19 Self-Contained Air Conditioners 23 40 13 Panel Air Filters548J 548J 548J 548J 548J Catalog No. PDS548J---01

548J specifications

The Bryant 548J is a high-efficiency gas furnace that combines advanced features and technologies to provide exceptional heating performance. Designed for residential applications, the furnace is notable for its ability to deliver consistent warmth while ensuring energy efficiency and reliability.

One of the main features of the Bryant 548J is its ultra-high efficiency rating, which allows homeowners to save significantly on energy costs. With an Annual Fuel Utilization Efficiency (AFUE) rating of up to 96.5%, this furnace is designed to convert a large portion of fuel into usable heat. This is a remarkable characteristic that not only reduces utility bills but also contributes to a lower environmental footprint.

The 548J is equipped with a modulating gas valve and a variable-speed blower motor. The modulating gas valve enables the furnace to adjust its heating output based on real-time temperature demands, ensuring a more precise heating experience. This results in reduced temperature fluctuations within the home, providing a comfortable living environment. The variable-speed blower motor works in tandem with the modulating valve, facilitating improved air circulation and efficient temperature control.

Additionally, the Bryant 548J features a durable and compact design, making it suitable for various installation spaces. Its quality construction ensures longevity, while the optional stainless steel heat exchanger enhances its reliability. The furnace also includes a quiet operation mode, which minimizes noise levels, ensuring that the unit works quietly in the background without disturbing the household's peace.

Integration with smart home technology is another advantage of the Bryant 548J. Homeowners have the option to connect the furnace to a Wi-Fi-enabled thermostat, allowing for remote temperature control and monitoring. This feature offers enhanced convenience and the ability to optimize energy use according to a homeowner’s schedule.

For peace of mind, the Bryant 548J comes with a range of warranties, protecting the consumer's investment. Bryant’s commitment to quality is reflected in their extensive primary heating testing procedures, which ensure that each unit meets strict performance criteria before it reaches the customer.

In summary, the Bryant 548J is an efficient and reliable gas furnace that embodies advanced heating technology. With features such as high AFUE ratings, modulating gas valves, variable-speed blowers, and smart home compatibility, it stands out as a formidable option for modern residential heating solutions.
Top Page Image Contents