Bryant R-22 service manual Crankcase Heater, VI. TIME-DELAY Relay

Page 16

T3 T1 T2

HN67ZA002

A91438

T2

T1

T3

HN67ZA003

A91439

 

T2

 

T1

 

T3

HN67ZA008

 

A94005

 

T3 BLK

T1 YEL

T2 VIO

 

T3 BLK

HN67PA025

 

 

A91440

Fig. 15—Cycle-Protector Device

Cycle-protector device is simple to troubleshoot. Only a voltmeter capable of reading 24v is needed. Device is in control circuit; therefore, troubleshooting is safe with control power (24v) on and high-voltage power off.

With high-voltage power off, attach voltmeter leads across T1 and T3 and set thermostat so that Y terminal is energized. Make sure all protective devices in series with Y terminal are closed. Voltmeter should read 24v across T1 and T3. With 24v still applied, move voltmeter lead from T1 terminal to T2 terminal across T2 and T3. After 5 ± 2 minutes, voltmeter should read 24v, indicating control is functioning normally. If no time delay is encountered or device never times out, change control.

V. CRANKCASE HEATER

Crankcase heater is a device for keeping compressor oil warm. By keeping oil warm, refrigerant does not migrate to and condense in compressor shell when the compressor is off. This prevents flooded starts which can damage compressor.

Crankcase heaters come in 2 basic types: wraparound-(bellyband) type that is wrapped externally around compressor shell, and insertion-type that is inserted into compressor oil well in shell of compressor. Both types are used in outdoor units.

On units that have a single-pole contactor, the crankcase heater is wired parallel with the contactor contacts and in series with the compressor. (See Fig. 18.) When the contacts are open, a circuit is completed from the line side of the contactor, through the crankcase heater, through the run windings of the compressor, and to the other side of the line. When the contacts are closed, there is

—16—

no circuit through the crankcase heater because both leads are connected to the same side of the line. This allows the heater to operate when the system is not calling for heating/cooling. The heater does not operate when the system is calling for heating/cooling. On units with 2 or 3 pole contactors, the crank- case heater is connected to the line side of the contactor and is not controlled by the contactor contacts.

The crankcase heater is powered by high-voltage power of unit. Use extreme caution troubleshooting this device with power on. The easiest method of troubleshooting is to apply voltmeter across crankcase heater leads to see if heater has power. Do not touch heater. Carefully feel area around crankcase heater. If warm, crankcase heater is probably functioning. Do not rely on this method as absolute evidence heater is functioning. If compressor has been running, the area will still be warm.

With power off and heater leads disconnected, check across leads with ohmmeter. Do not look for a specific resistance reading. Check for resistance or an open circuit. Change heater if an open circuit is detected. Some crankcase heaters in this series of units are equipped with a crankcase-heater switch. This energy-saving device shuts off power to heater when temperatures are high enough that heater is not needed. Be sure this switch is functioning normally before condemning crankcase heater.

VI. TIME-DELAY RELAY

The time-delay relay (TDR) is a solid-state-controlled, recycle- delay timer which keeps the indoor blower operating for 90 sec after thermostat is satisfied. This delay enables the blower to remove residual cooling in the coil after compression shutdown,

Page 15 Page 17
Image 16
Page 15 Page 17
Contents Table of Contents Safety ConsiderationsII. ADD-ON Replacement Retrofit Accessory DescriptionsVIII. LOW-AMBIENT Pressure Switch III. Seacoast for AIR Conditioners onlyII. Interconnecting Tubing Sizing IX. Wind BaffleCoastal Filter XI. Support FeetMatl 18 GA Steel Matl 20 GA SteelUnit Size Unit Height SmallMedium Baffle LeftEstimated Percentage of Nominal COOLING-CAPACITY Losses Wind Baffle Dimensions for Cube UnitsIII. Metering Device Sizing IV. LIQUID-LINE Solenoid and Tubing CONFIGU- Ration Fitting Losses in Equivalent FTExample Calculation of Indoor Piston noCommon Piston Sizes LIQUID-LINE Solenoid KIT Part NumbersCharging Information VI -SPEED ApplicationsII. Serial Number Identification Positions 6 through 10-Serial NumberII. Remove FAN-MOTOR ASSEMBLY-BEFORE 1/1/92 CabinetRemove TOP COVER-BEFORE 1/1/92 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 SwitchHIGH-PRESSURE Switch LIQUID-LINE Pressure SwitchVIII. Defrost Thermostats IX. DEFROST-CONTROL BoardCES0110063 Defrost Control CES0110063 CES0130024SPEED-UP Defrost Control SPEED-UP Timing SEParameter Minimum Maximum XI. Service Alarm Control Board Defrost Timer SettingsFAN Motors OF2 CESO130076-00 XII. Outdoor ThermostatsFAN Position Aeroquiet System and Aeromax TOPService Alarm Wiring Connections XIII. Compressor PlugReciprocating Compressor XIV. LOW-VOLTAGE TerminalsMechanical Failures II. Electrical Failures III. System Cleanup After Burnout IV. Compressor Removal and ReplacementCopeland Scroll Compressor Features II. TroubleshootingCompressor OIL Recharge III. Discharge ThermostatMillennium Scroll Compressor Features III. TroubleshootingIV. Scroll COMPRESSOR, 3-PHASE Monitor II. Compressor ProtectionIFR Indoor External Power Supply 24 Cont Equip GND CAP OFM LogicCESO130075 Cont HPS LPSAmbient Temperature for HIGH- LOW-SPEED Operation Function Light Code and Display Location III. Factory Defaults Factory DefaultsCompressor PTC Ranges IV. Major ComponentsTWO-SPEED Compressor Winding Resistance AT 70F ± VI. TroubleshootingLED FUNCTION/MALFUNCTION Lights Refrigeration System Refrigeration Cycle II. Leak DetectionLow-Speed Windings 24V PIN Connection Troubleshooting III. BrazingCooling Cycle AllService Valves IV. Service ValvesReliant and Cube Products Produced Reliant Products Except 1992 ProductionVI. Reversing Valve Reversing Valve VII. THERMOSTATIC-EXPANSION Valves TXVTXV Superheat Setting AT Outlet of Evaporator Coil Installation TXV Type Product Usage Superheat SettingVIII. THERMOSTATIC-EXPANSION Valve BI-FLOW TXV IX. Coil RemovalTXV in Cooling Mode XI. Accumulator XII. Contaminant RemovalXIII. System Charging XIV. Checking ChargeRequired Vapor Temperature F Superheat Charging TableSuperheat Charging Method Subcooling Charging MethodReliant AIR Conditioners Care and MaintenanceReliant Heat Pumps 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.
Top Page Image Contents