Bryant R-22 service manual Millennium Scroll Compressor Features, II. Compressor Protection

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PLASTIC CAP

BLUE SEALANT

PRONG

GROMMET

THERMAL GREASE

THERMOSTAT

 

 

A90198

Fig. 30—Location of Discharge Thermostat

cause a rapid pressure equalization around the compressor, thus reducing the normal shutdown sound created by reverse rotation of the scroll. The solenoid valve is normally closed and is wired across high-voltage line 1 to load terminals of the contactor. (See Fig. 18.) The solenoid-valve assembly also requires a check valve piped in the discharge tube between the solenoid-valve tee and the condenser coil, or reversing valve on heat pumps. The purpose of the check valve is to prevent refrigerant from bypassing through the solenoid valve into the suction tube when the unit cycles off.

MILLENNIUM SCROLL COMPRESSOR

I. FEATURES

The scroll compressor pumps refrigerant through the system by the interaction of a stationary and an orbiting scroll. (See Fig. 29.) The scroll compressor has no dynamic suction or discharge valves, and it is more tolerant of stresses caused by debris, liquid slugging, and flooded starts. The Millennium scroll varies from the Copeland scroll in that the Millennium has a shutdown flapper valve located between the scroll plates and the discharge head, whereas the Copeland has a check device at the discharge connection after the discharge head. The Copeland discharge head unloads when the compressor shuts down. The scroll plate actually runs backwards while it unloads. A 1 to 3 second unloading of refrigerant occurs.

The Millennium flapper valve eliminates the refrigerant unloading by not allowing the discharge head to run backwards because of its location. The Millennium scroll compressor uses Zerol 150 oil with 3 percent Syn-O-Ad and is the only oil recommended for oil recharge. See Table 13 for recharge requirements.

II. COMPRESSOR PROTECTION

Millennium scroll compressors are protected by an internal line- break mounted on the motor windings. Internal protectors respond to overcurrent and high temperature. These protectors are automatic-reset devices containing a snap-action, bi-metal switch.

III. TROUBLESHOOTING

Troubleshooting mechanical and electrical problems in a scroll compressor is similar to a reciprocating compressor, except that a scroll compressor should never be allowed to pump into a vacuum.

—29—

The scroll compressor is capable of pumping into a vacuum very quickly, which could cause fusite arcing and compressor failure. See Step IV of Reciprocating Compressor section for removal and replacement.

IV. SCROLL COMPRESSOR, 3–PHASE MONITOR

CES0130075 — PHASE MONITOR

This control is factory-installed on all 3–phase, scroll compressor models. (See Fig. 31 and 32.) On start-up, the control will energize the pilot relay for 2 seconds. The monitor will check for correct compressor rotation. If rotation is correct, unit will continue to run. If rotation is incorrect, the control will break the 24vac power at the contactor and an LED light on the control will flash. If LED is flashing, turn off power, reverse L1 and L3 field-power leads, and restart unit. This control will check incoming power at every restart.

TWO-SPEED SYSTEM

I. CAUTIONS AND WARNINGS

CAUTION: For proper unit operation and reliability, the 2-speed units must be installed with the factory-supplied balance port, hard shutoff TXV. Do not install with indoor coils having piston or capillary-tube metering devices.

CAUTION: Do not install equivalent interconnecting tubing lengths greater than 100 ft. Do not decrease or increase interconnecting tubing diameters.

CAUTION: To avoid electrical shock, bleed resistor must be connected across run capacitor. Replace if missing or damaged.

CAUTION: Contactor is mechanically interlocked. Do not disable mechanical interlock. Compressor damage may occur.

WARNING: Contactor control voltage is 240vac.

WARNING: Do not attempt to operate this equipment below 55°F outdoor ambient temperature.

NOTE: Sections that follow describe the 598A Series B and 698A Series B products, which started production March, 1994. For 598A Series A and 698A Series A products, refer to the Split-System Service Manual dated 3–1–94, Catalog No. BDP 3356–115.

II. SYSTEM FUNCTIONS

COOLING OPERATION

The 2-speed products utilize a 2-stage-cooling indoor thermostat. With a call for first-stage cooling (Y1), the outdoor fan and low-speed compressor are energized. If low speed cannot satisfy the cooling demand, high speed will be energized (Y1 and Y2) by the second stage of the indoor thermostat. The thermostat has a 2° differential between first and second stages. After second stage is satisfied, the unit returns to low-speed operation, until first stage is satisfied, or until second stage is again required.

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Contents Safety Considerations Table of ContentsAccessory Descriptions II. ADD-ON Replacement RetrofitVIII. LOW-AMBIENT Pressure Switch III. Seacoast for AIR Conditioners onlyIX. Wind Baffle II. Interconnecting Tubing SizingCoastal Filter XI. Support FeetMatl 20 GA Steel Matl 18 GA SteelSmall Unit Size Unit HeightMedium Baffle LeftIII. Metering Device Sizing Wind Baffle Dimensions for Cube UnitsEstimated Percentage of Nominal COOLING-CAPACITY Losses Fitting Losses in Equivalent FT IV. LIQUID-LINE Solenoid and Tubing CONFIGU- RationExample Calculation of Indoor Piston noLIQUID-LINE Solenoid KIT Part Numbers Common Piston SizesCharging Information VI -SPEED ApplicationsPositions 6 through 10-Serial Number II. Serial Number IdentificationCabinet II. Remove FAN-MOTOR ASSEMBLY-BEFORE 1/1/92Remove TOP COVER-BEFORE 1/1/92 III. Information PLATE-RELIANT ProductsVI. Remove FAN-MOTOR ASSEMBLY-AFTER 1/1/92 Basic Cabinet Designs Electrical Aluminum WireII. Contactors Information PlateStart Capacitors and PTC Devices III. CapacitorsIV. Cycle Protector Temporary Capacitance BoostCrankcase Heater VI. TIME-DELAY RelayLOW-PRESSURE Switch VII. Pressure SwitchesLIQUID-LINE Pressure Switch HIGH-PRESSURE SwitchVIII. Defrost Thermostats IX. DEFROST-CONTROL BoardCES0110063 CES0130024 CES0110063 Defrost ControlParameter Minimum Maximum Defrost Control SPEED-UP Timing SESPEED-UP FAN Motors Defrost Timer SettingsXI. Service Alarm Control Board XII. Outdoor Thermostats OF2 CESO130076-00Aeroquiet System and Aeromax TOP FAN PositionXIII. Compressor Plug Service Alarm Wiring ConnectionsMechanical Failures XIV. LOW-VOLTAGE TerminalsReciprocating Compressor II. Electrical Failures IV. Compressor Removal and Replacement III. System Cleanup After BurnoutII. Troubleshooting Copeland Scroll Compressor FeaturesCompressor OIL Recharge III. Discharge ThermostatIII. Troubleshooting Millennium Scroll Compressor FeaturesIV. Scroll COMPRESSOR, 3-PHASE Monitor II. Compressor ProtectionCont Equip GND CAP OFM Logic IFR Indoor External Power Supply 24CESO130075 Cont HPS LPSAmbient Temperature for HIGH- LOW-SPEED Operation Function Light Code and Display Location Factory Defaults III. Factory DefaultsCompressor PTC Ranges IV. Major ComponentsLED FUNCTION/MALFUNCTION Lights VI. TroubleshootingTWO-SPEED Compressor Winding Resistance AT 70F ± II. Leak Detection Refrigeration System Refrigeration CycleLow-Speed Windings III. Brazing 24V PIN Connection TroubleshootingCooling Cycle AllIV. Service Valves Service ValvesVI. Reversing Valve Reliant Products Except 1992 ProductionReliant and Cube Products Produced VII. THERMOSTATIC-EXPANSION Valves TXV Reversing ValveInstallation TXV Type Product Usage Superheat Setting TXV Superheat Setting AT Outlet of Evaporator CoilVIII. THERMOSTATIC-EXPANSION Valve BI-FLOW TXV IX. Coil RemovalTXV in Cooling Mode XII. Contaminant Removal XI. AccumulatorXIII. System Charging XIV. Checking ChargeSuperheat Charging Table Required Vapor Temperature FSuperheat Charging Method Subcooling Charging MethodReliant Heat Pumps Care and MaintenanceReliant AIR Conditioners Required LIQUID-LINE Temperature Page AIR Conditioner Troubleshooting Chart Heat Pump TROUBLESHOOTING-COOLING Cycle Heat Pump TROUBLESHOOTING-HEATING Cycle
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R-22 specifications

The Bryant R-22 stands out in the landscape of residential heating and cooling systems with its combination of efficiency, durability, and modern technology. Designed primarily for homeowners seeking comfortable climate control solutions, the R-22 model delivers consistent performance throughout varying seasonal extremes.

One of the main features of the Bryant R-22 is its high energy efficiency. Rated with a SEER (Seasonal Energy Efficiency Ratio) that meets or exceeds industry standards, this air conditioning unit is designed to reduce energy consumption while providing optimal cooling. This not only helps in lowering monthly utility bills but also promotes environmentally responsible usage.

Another notable characteristic is the unit's durability. Constructed with a robust cabinet and high-quality components, the R-22 is built to withstand the rigors of daily use, with protective features that enhance its longevity. The cabinet comes with a powder-coated finish that resists corrosion and harsh weather conditions, ensuring that the unit stays functional and aesthetically pleasing for years.

The Bryant R-22 also incorporates advanced technology to improve user experience. One such innovation is the SmartSet technology, which allows homeowners to program their unit to optimize comfort levels according to their specific needs. This programmable capability enhances energy savings and ensures that the home remains at the desired temperature when residents are present.

Moreover, the unit features a Quiet Operating System that significantly reduces noise levels, making it suitable for residential areas where noise might be a concern. The design minimizes vibrations and optimizes airflow, creating a comfortable environment without disruptive sounds.

For added convenience, the Bryant R-22 is compatible with various thermostat options, including Wi-Fi-enabled models. This allows users to control their home's climate from anywhere using a smartphone app, facilitating effortless adjustments and monitoring of energy usage.

Finally, the Bryant R-22 is backed by a solid warranty, providing peace of mind for homeowners. This commitment to quality and customer satisfaction is a testament to Bryant’s dedication to producing reliable and efficient HVAC solutions. Overall, the Bryant R-22 is an exemplary choice for those looking to enhance their home comfort with the latest in HVAC technology.
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