Bryant 577D----A installation instructions Check GAS Input Propane GAS, Check Burner Flame

Page 27

a.129 sec. to complete one revolution

b.3600/129 = 27.9

c.27.9 x 2 = 55.8 ft3 of gas flow/hr.

d.55.8 x 1050 = 58,590 Btuh input.

In this example, the nominal input rate for low stage is 58,500 Btu/hr, so the low stage manifold pressure is correctly set.

If the measured low stage rate is too low, increase the manifold pressure to increase rate. If the measured low stage rate is too high, decrease the manifold pressure to decrease rate.

NOTE: Double-check that UI is running on low stage gas heat while clocking the low stage firing rate.

4.Verify proper low stage gas heat temperature rise.

a.Furnace must operate within rise range listed on rating plate.

b.Select ”COMFORT” or ”EFFICIENCY” mode on UI. ”COMFORT” mode will provide a warmer supply air temperature, while ”EFFICIENCY” will provide lower gas consumption.

c.Make sure access panel is re-installed on the unit.

d.Measure supply and return temperatures as close to the unit as possible. Subtract the return temperature from the supply temperature to determine rise. Rise should fall within the range specified on the rating plate.

5.Adjust manifold pressure to obtain high stage input rate (See Fig. 19).

a.Set unit to run for 20 minutes in high-stage gas heat operation using the ”INSTALLER CHECKOUT” menu on the UI.

b.Remove regulator adjustment cap from high stage gas valve pressure regulator (See Fig. 19) and turn high-stage adjusting screw (3/16 or smaller flat-tipped screwdriver) counterclockwise (out) to decrease rate and clockwise (in) to increase input rate.

NOTE: DO NOT set high stage manifold pressure less than 3.2 IN. W.C. or more than 3.8 IN. W.C. for natural gas. If manifold pressure is outside this range, change main burner orifices.

c.Re-install high stage regulator adjustment cap.

d.Leave manometer connected.

6.Verify natural gas high stage input rate.

a.Turn off all other gas appliances and pilots served by the gas meter.

b.If unit is not running, set unit to run for 20 minutes in high stage gas heat operation using the ”INSTALLER CHECKOUT” menu on the UI.

c.Record number of seconds for gas meter to complete 1 revolution.

d.Divide number of seconds in step c. into 3600 (number of seconds in 1 hour).

e.Multiply result of step d. by the number of cubic feet shown for one revolution of test dial to obtain cubic feet of gas flow per hour.

f.Multiply result of step f. by Btu heating value of the gas to obtain total measured input shown in Table 6. (Consult the local gas supplier if the heating value of gas is not known).

EXAMPLE: Assume a 90,000 high stage input unit is being installed. Assume that the size of the dial is 2 cubic ft., one revolution takes 84 sec., and the heating value of the gas is 1025 Btu/ft3. Proceed as follows:

a.84 sec. to complete one revolution

b.3600/84 = 42.9

c.42.9 x 2 = 85.8 ft3 of gas flow/hr.

d.85.8 x 1050 = 90,090 Btuh input.

In this example, the nominal input rate for high stage is 90,000 Btu/hr, so the high stage manifold pressure is correctly set.

If the measured high stage rate is too low, increase the manifold pressure to increase rate. If the measured high stage rate is too high, decrease the manifold pressure to decrease rate.

NOTE: Double-check that User Interface is running on high stage gas heat while clocking the low stage firing rate.

7.Verify proper high stage gas heat temperature rise.

a.Furnace must operate within rise range listed on rating plate.

b.Make sure access panel is re-installed on the unit.

c.Measure supply and return temperatures as close to the unit as possible. Subtract the return temperature from the supply temperature to determine rise. Rise should fall within the range specified on the rating plate.

NOTE: If the temperature rise is outside the rating plate range,

 

 

first check:

 

a. Gas input for low and high stage gas heat operation.

A

b. Derate for altitude, if applicable.

--

--

 

c. Return and supply ducts for excessive restrictions

577D

causing static pressures in excess of .5 IN. W.C.

 

d. Make sure model plug is installed.

 

8. Final Check

 

a. Turn off gas to unit

 

b. Remove manometer from pressure tap.

 

c. Replace pipe plug on manifold (See Fig. 20).

 

d. Turn on gas to unit.

 

e. Check for leaks.

 

CHECK GAS INPUT (PROPANE GAS)

 

Refer to propane kit installation instructions for properly checking

 

gas input.

 

NOTE: For installations below 2,000 ft (610 m), refer to the unit

 

rating plate for proper propane conversion kit. For installations

 

above 2,000 ft (610 m), contact your distributor for proper propane

 

conversion kit.

 

CHECK BURNER FLAME

 

With control access panel removed (See Fig. 24), observe the unit

 

heating operation. Watch the burner flames to see if they are light

 

blue and soft in appearance, and that the flames are approximately

 

the same for each burner. Propane will have blue flame (See Fig.

 

21). Refer to the Maintenance section for information on burner

 

removal.

 

Pipe Plug

Manifold

 

A09082

Fig. 20 - Burner Assembly

27

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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--ASelect and Install Ductwork Cabinet Model Rigging WeightPersonal Injury Hazard Supply and Return Duct Opening Provide for Condensate DisposalInstall Flue Hood Install Gas PipingCarbon Monoxide Poisoning Hazard Install Electrical Connections Fire or Explosion HazardUnit Component Damage 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 AdjustmentsHeating Inputs ECM Wet Coil Pressure Drop IN. W.CFilter Pressure Drop Table 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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