Bryant 581A Start-Up, Unit Preparation, II. Service Valves, III. Compressor Mounting

Page 14

Sensor Assembly — Install the sensor assembly in the loca- tion shown in Fig. 26.

Motor Mount — To ensure proper fan height, replace the existing motor mount with the new motor mount provided with accessory.

Transformer (460-v Units Only) — On 460 volt units, a trans- former is required. The transformer is provided with the accessory and must be field-installed.

Motormaster® I Control — Recommended mounting location is on the inside of the panel to the left of the control box. The control should be mounted on the inside of the panel, verti- cally, with leads protruding from bottom of extrusion.

B. Motormaster III Control Installation (581A240)

Install Field-Fabricated Wind Baffles

Wind baffles must be field-fabricated for all units to ensure proper cooling cycle operation at low ambient temperatures. See Fig. 25 for baffle details. Use 20-gage, galvanized sheet metal, or similar corrosion-resistant metal for baffles. Use field-supplied screws to attach baffles to unit. Screws should be 1/4-in. diameter and 5/8-in. long. Drill required screw holes for mounting baffles.

CAUTION: To avoid damage to the refrigerant coils and electrical components, use recommended screw sizes only. Use care when drilling holes.

MOTORMASTER

SENSOR

LOCATION

HAIRPIN END

NOTES:

1.All sensors are located on the eighth hairpin up from the bottom.

2.Field installed tubing insulation is required to be installed over the TXV (thermostatic expansion valve) bulb and capillary tube for proper operation at low ambients. Tubing insulation is only required on the portion of suction line located between indoor and outdoor section.

Fig. 26 — Motormaster I and Motormaster III Sensor

Locations

Replace Outdoor Motor

Replace outdoor-fan motor no. 1 with motor included in accessory kit. Existing motor is not Motormaster III compatible.

Install Motormaster III Controls

Only one Motormaster III control is required per unit.

Sensor — Install the sensor for thermistor input control in the location shown in Fig. 26. Connect sensor leads to the purple and grey control signal leads on the Motormaster III control.

Signal Selection Switch — Remove the cover of the Motor- master III control. Set the switch to accept the thermistor sensor input signal. Set the frequency to match the unit power supply (60 Hz).

Motormaster III Control — Recommended mounting location is beneath the control box, mounted to the partition that sep- arates the control box section from the indoor section.

NOTE: If unit power is supplied through the roof curb and basepan of the unit, mount the Motormaster III control on the corner post adjacent to the conduit running from the basepan to the bottom of the control box.

START-UP

Use the following information and Start-Up Checklist on page CL-1 to check out unit PRIOR to start-up.

I. UNIT PREPARATION

Check that unit has been installed in accordance with these installation instructions and all applicable codes.

II. SERVICE VALVES

Ensure that the liquid line service valve is open. Damage to the compressor could result if it is left closed.

III. COMPRESSOR MOUNTING

Compressors are internally spring mounted. Do not loosen or remove compressor holddown bolts.

IV. REFRIGERANT SERVICE PORTS

Each refrigerant system has a total of 3 Schrader-type ser- vice gage ports. One port is located on the suction line, one on the compressor discharge line, and one on the liquid line. In addition Schrader-type valves are located underneath the low-pressure switches. Be sure that caps on the ports are tight.

V. COMPRESSOR ROTATION

It is important to be certain the compressors are rotating in the proper direction. To determine whether or not compres- sors are rotating in the proper direction:

1.Connect service gages to suction and discharge pres- sure 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 pres- sure does not rise to normal levels:

1.Note that the evaporator fan is probably also rotating in the wrong direction.

2.Turn off power to the unit.

3.Reverse any two of the incoming power leads.

4.Turn on power to the compressor.

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

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Contents Installation Provide Unit Support ContentsSafety Considerations Roof Curb Details Positioning Alternate Unit SupportII. RIG and Place Unit Roof MountBase Unit Dimensions 581A155 Base Unit Dimensions 581A240 Physical Data Unit 581AIV. Make Unit Duct Connections Install Flue Hood and Wind BaffleIII. Field Fabricate Ductwork 581A180, 240 Unit ShownVI. Trap Condensate Drain VII. Install GAS PipingField Power Supply VIII. Make Electrical ConnectionsManual Outdoor-Air Damper Field Control WiringMake OUTDOOR-AIR Inlet Adjustments Optional EconomizerElectrical Data FLA LRA MCA MocpInstall OUTDOOR-AIR Hood 25% Outdoor-Air Section DetailsEnthalpy Control Installation Seal Strip LocationXI. Install ALL Accessories Motormaster I Control Installation 581A155 and 180 OnlySTART-UP II. Service ValvesIV. Refrigerant Service Ports Unit PreparationVII. Crankcase Heaters VI. Internal WiringXII. Accessory Economizer Adjustment VIII. Evaporator FANBhp Brake Horsepower Fan Performance 581A180270 Low Heat Units Fan Performance 581A240270 Low Heat Units 753 915 844 1077 949 1287 1047 753 942 844 1101 949 Fan Performance 581A180360 High Heat Units Fan Performance 581A240360 High Heat Units Fan RPM at Motor Pulley Setting Evaporator Fan Motor SpecificationsAccessory/FIOP Economizer Static Pressure in. wg Air Quantity LimitsXIII. GAS Heat XIV. Base Unit OperationService Cleaning IV. Evaporator FAN Service and Replacement II. Lubrication581A155 and 180 Units Fig Belt Tension AdjustmentVI. CONDENSER-FAN Adjustment 581A240 Units FigIX. Refrigerant Charge VII. Economizer AdjustmentVIII. Power Failure XII. Filter Drier GAS Valve AdjustmentXI. Main Burners XIII. Protective DevicesXIV. Relief Devices XVI. Replacement PartsXVII. Diagnostic Leds XV. Control CircuitSpark Gap Adjustment Typical Wiring Schematic and Typical Component Arrangement Typical Wiring Schematic 581A180, 208/230 V Unit Shown Typical Component Arrangement 581A180 Shown Problem Cause Remedy TroubleshootingCooling Service Analysis Heating Service Analysis Burners will not igniteIGC Control Heating and Cooling Packaged Service Training Call for Free CatalogPage Pressures TemperaturesElectrical General
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581A specifications

The Bryant 581A is a pivotal model in the realm of heating, ventilation, and air conditioning (HVAC) systems, known for its robust performance and energy efficiency. As part of the Bryant product lineup, the 581A offers a blend of innovative technologies combined with reliable engineering, making it a suitable choice for both residential and light commercial applications.

One of the standout features of the Bryant 581A is its outstanding energy efficiency. With a Seasonal Energy Efficiency Ratio (SEER) rating of up to 16, this model meets Energy Star qualifications, ensuring that homeowners can enjoy lower utility bills while helping to reduce their environmental footprint. The efficiency is further enhanced by the unit’s environmentally friendly refrigerant, which not only improves performance but also aligns with modern sustainability standards.

Another key characteristic of the Bryant 581A is its durable construction. Designed to withstand various weather conditions, the unit features a robust cabinet that protects internal components. This durability not only prolongs the lifespan of the system but also minimizes the need for frequent maintenance or repairs. The coil design is optimized for heat transfer efficiency, enhancing the unit's overall performance in both cooling and heating modes.

In terms of technology, the Bryant 581A incorporates advanced control systems that enable precise temperature regulation. The multi-stage cooling capabilities ensure that the system can adapt to varying temperature demands, providing comfort in all seasons. Additionally, the model is compatible with smart thermostats, allowing homeowners to control their HVAC system remotely via smartphone or other connected devices.

Noise reduction is another aspect where the Bryant 581A excels. Equipped with a variable-speed compressor and sound-dampening features, this model operates quietly, minimizing disruption in residential or office environments. This focus on acoustic comfort makes it an ideal choice for those who value a peaceful living or working space.

Overall, the Bryant 581A represents an excellent balance of efficiency, durability, and modern technology. With features aimed at enhancing user comfort and reducing operational costs, it stands out as a reliable solution in the competitive HVAC market. Whether for new installations or replacements, the Bryant 581A is a testament to the brand’s commitment to quality and innovation in home climate control.
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