Bryant R-22 service manual IV. Service Valves

Page 38

 

SERVICE PORT

 

STEM

W/SCHRADER

FIELD

 

CORE

 

 

SIDE

 

 

STEM

 

 

SERVICE PORT

 

 

W/SCHRADER CORE

 

FIELD

 

 

SIDE

 

SEAT

 

 

 

 

SEAT

BAR STOCK FRONT SEATING VALVE

FORGED FRONT SEATING VALVE

A91447

A91448

Fig. 44—Service Valves

b. Remove all flux residue with brush and water while material is still hot.

2.Use ″ sil-fos″or ″ phos-copper″for copper-to-copper only. No flux is required.

3.Silver solder is used on copper-to-brass, copper-to-steel, or copper-to-copper. Flux is required when using silver solder.

4.Fluxes should be used carefully. Avoid excessive applica- tion and do not allow fluxes to enter into the system.

5.Proper brazing temperature of copper is when it is heated to a dull red color.

This section on brazing is not intended to teach a technician how to braze. There are books and classes that teach and refine brazing techniques. The basic points above are listed only as a reminder.

IV. SERVICE VALVES

WARNING: Never attempt to make repairs to existing service valves. Unit operates under high pressure. Dam- aged seats and o-rings should not be replaced. Replace- ment of entire service valve is required. Tampering with damaged valves can cause personal injury or death. Service valve must be replaced by properly trained service technician.

Service valves provide a means for holding original factory charge in outdoor unit prior to hookup to indoor coil. They also contain gage ports for measuring system pressures and provide shutoff convenience for certain types of repairs. (See Fig. 44.)

Two types of service valves are used in outdoor residential equipment. The first type is a front-seating valve, which has a service port that contains a Schrader fitting. The service port is always pressurized after the valve is moved off the front-seat position.

The second type is a combination front-seating/back-seating valve, which has a metal-to-metal seat in both the open and closed positions. When it is fully back-seated, the service port is not

—38—

pressurized. To pressurize the service port, this valve must be moved off the back-seating position. This valve does not contain a Schrader fitting. Both types of service valves are designed for sweat connection to the field tubing.

The service valves in the outdoor unit come from the factory front-seated. This means that the refrigerant charge is isolated from the line-set connection ports. Some heat pumps are shipped with sweat-adapter tube. This tube must be installed on the liquid- service valve. After connecting the sweat adapter to the liquid- service valve of a heat pump, the valves are ready for brazing. The interconnecting tubing (line set) can be brazed to the service valves using either silver-bearing or non-silver-bearing brazing material. Consult local codes.

Before brazing the line set to the valves, the belled ends of the sweat connections on the service valves must be cleaned so that no brass plating remains on either the inside or outside of the bell joint. To prevent damage to the valve and/or cap ″ O″ ring, use a wet cloth or other acceptable heat-sinking material on the valve before brazing. To prevent damage to the unit, use a metal barrier between brazing area and unit.

After the brazing operation and the refrigerant tubing and evapo- rator coil have been evacuated, the valve stem can be turned counterclockwise until it opens or back-seats, which releases refrigerant into tubing and evaporator coil. The system can now be operated.

Back-seating service valves must be back-seated (turned counter- clockwise until seated) before the service-port caps can be re- moved and hoses of gage manifold connected. In this position, refrigerant has access from and through outdoor and indoor unit. The service valve-stem cap is tightened to 20 ± 2 ft/lb torque and the service-port caps to 9 ± 2 ft/lb torque. The seating surface of the valve stem has a knife-set edge against which the caps are tightened to attain a metal-to-metal seal. If accessory pressure switches are used, the service valve must be cracked. Then, the knife-set stem cap becomes the primary seal.

The service valve cannot be field-repaired; therefore, only a complete valve or valve stem and service-port caps are available for replacement.

Page 37 Page 39
Image 38
Page 37 Page 39
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.
Top Page Image Contents