Bryant R-22 service manual III. Capacitors, Start Capacitors and PTC Devices

Page 14

A88350

Fig. 11—Contactor

III. CAPACITORS

CAUTION: Capacitors can store electrical energy when power is off. Electrical shock can result if you touch the capacitor terminals and discharge the stored energy. Exercise extreme caution when working near capacitors. With power off, discharge stored energy by shorting across the capacitor terminals with a 15,000-ohm, 2-watt resistor.

NOTE: If bleed resistor is wired across start capacitor, it must be disconnected to avoid erroneous readings when ohmmeter is applied across capacitor. (See Fig. 12.)

CAUTION: Always check capacitors with power off. Attempting to troubleshoot a capacitor with power on can be dangerous. Defective capacitors may explode when power is applied. Insulating fluid inside is combustible and may ignite, causing burns.

Capacitors are used as a phase-shifting device to aid in starting certain single-phase motors. Check capacitors as follows.

1.After power is off, discharge capacitors as outlined above. Disconnect capacitor from circuit. Put ohmmeter on R X 10k scale. Using ohmmeter, check each terminal to ground (use capacitor case). Discard any capacitor which measures 1/2–scale deflection or less. Place ohmmeter leads across capacitor and place on R X 10k scale. Meter should jump to a low-resistance value and slowly climb to higher value. Failure of meter to do this indicates an open capacitor. If resistance stays at zero or a low value, capacitor is inter- nally shorted.

2.Capacitance testers are available which read value of capacitor. If value is not within ± 10 percent value stated on capacitor, it should be changed. If capacitor is not open or shorted, the capacitance value is calculated by measuring voltage across capacitor and current it draws.

WARNING: Exercise extreme caution when taking readings while power is on. Electrical shock can cause personal injury or death.

—14—

A91455

Fig. 12—Capacitors

Use the following formula to calculate capacitance: Capacitance (mfd) = (2650 X amps) divided by (volts)

3.Remove any capacitor that shows signs of bulging, dents, or leaking. Do not apply power to a defective capacitor as it may explode.

START CAPACITORS AND PTC DEVICES

Sometimes under adverse conditions, a standard run capacitor in a system is inadequate to start compressor. In these instances, a start-assist device is used to provide an extra starting boost to compressor motor. The first device is called a positive-temperature coefficient (PTC) or thermistor. (See Fig. 13.) It is a resistor wired in parallel with the run capacitor. As current flows through the PTC at start-up, it heats up. As it heats up, its resistance increases greatly until it effectively lowers the current through it to an extremely low value. This, in effect, removes it from the circuit.

12.5-22.5 OHMS

 

 

 

 

 

12.5 OHM

 

 

 

 

 

 

 

(BEIGE COLOR)

25-45 OHMS

 

 

20-36 OHMS

 

 

 

 

 

 

 

 

 

 

 

 

 

BLUE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20 OHM

25 OHM

(BLUE COLOR)

(BLUE COLOR)

 

 

 

 

 

 

A88414

Fig. 13—PTC Devices

After system shutdown, resistor cools and resistance value returns to normal until next time system starts. If indoor coil does not have a bleed-type expansion device, it may be necessary to remove start thermistor and replace with accessory start capacitor and relay. Consult pre-sale literature for application of start kits. Thermistor device is adequate for most conditions; however, in systems where off-cycle is short, device cannot cool fully and becomes less effective as a start device. It is an easy device to troubleshoot.

1.Shut off all power to system.

2.Check thermistor with ohmmeter as described below.

3.Shut off all power to unit.

Image 14
Contents Table of Contents Safety ConsiderationsVIII. LOW-AMBIENT Pressure Switch II. ADD-ON Replacement RetrofitAccessory Descriptions III. Seacoast for AIR Conditioners onlyCoastal Filter II. Interconnecting Tubing SizingIX. Wind Baffle XI. Support FeetMatl 18 GA Steel Matl 20 GA SteelMedium Unit Size Unit HeightSmall Baffle LeftIII. Metering Device Sizing Wind Baffle Dimensions for Cube UnitsEstimated Percentage of Nominal COOLING-CAPACITY Losses Example IV. LIQUID-LINE Solenoid and Tubing CONFIGU- RationFitting Losses in Equivalent FT Calculation of Indoor Piston noCharging Information Common Piston SizesLIQUID-LINE Solenoid KIT Part Numbers VI -SPEED ApplicationsII. Serial Number Identification Positions 6 through 10-Serial NumberRemove TOP COVER-BEFORE 1/1/92 II. Remove FAN-MOTOR ASSEMBLY-BEFORE 1/1/92Cabinet III. Information PLATE-RELIANT ProductsVI. Remove FAN-MOTOR ASSEMBLY-AFTER 1/1/92 Electrical Aluminum Wire Basic Cabinet DesignsInformation Plate II. ContactorsIII. Capacitors Start Capacitors and PTC DevicesTemporary Capacitance Boost IV. Cycle ProtectorVI. TIME-DELAY Relay Crankcase HeaterVII. Pressure Switches LOW-PRESSURE SwitchVIII. Defrost Thermostats HIGH-PRESSURE SwitchLIQUID-LINE Pressure Switch IX. DEFROST-CONTROL BoardCES0110063 Defrost Control CES0110063 CES0130024Parameter Minimum Maximum Defrost Control SPEED-UP Timing SESPEED-UP FAN Motors Defrost Timer SettingsXI. Service Alarm Control Board OF2 CESO130076-00 XII. Outdoor ThermostatsFAN Position Aeroquiet System and Aeromax TOPService Alarm Wiring Connections XIII. Compressor PlugMechanical Failures XIV. LOW-VOLTAGE TerminalsReciprocating Compressor II. Electrical Failures III. System Cleanup After Burnout IV. Compressor Removal and ReplacementCompressor OIL Recharge Copeland Scroll Compressor FeaturesII. Troubleshooting III. Discharge ThermostatIV. Scroll COMPRESSOR, 3-PHASE Monitor Millennium Scroll Compressor FeaturesIII. Troubleshooting II. Compressor ProtectionCESO130075 IFR Indoor External Power Supply 24Cont Equip GND CAP OFM Logic Cont HPS LPSAmbient Temperature for HIGH- LOW-SPEED Operation Function Light Code and Display Location Compressor PTC Ranges III. Factory DefaultsFactory Defaults IV. Major ComponentsLED FUNCTION/MALFUNCTION Lights VI. TroubleshootingTWO-SPEED Compressor Winding Resistance AT 70F ± Refrigeration System Refrigeration Cycle II. Leak DetectionLow-Speed Windings Cooling Cycle 24V PIN Connection TroubleshootingIII. Brazing AllService Valves IV. Service ValvesVI. Reversing Valve Reliant Products Except 1992 ProductionReliant and Cube Products Produced Reversing Valve VII. THERMOSTATIC-EXPANSION Valves TXVVIII. THERMOSTATIC-EXPANSION Valve BI-FLOW TXV TXV Superheat Setting AT Outlet of Evaporator CoilInstallation TXV Type Product Usage Superheat Setting IX. Coil RemovalTXV in Cooling Mode XIII. System Charging XI. AccumulatorXII. Contaminant Removal XIV. Checking ChargeSuperheat Charging Method Required Vapor Temperature FSuperheat Charging Table 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
Related manuals
Manual 84 pages 49.8 Kb

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.