Bryant R-22 service manual System Suction Pressure Drop

Page 37

Table 7—R-22 System Suction Pressure Drop

Nominal

 

Line

Pressure

Suction

 

 

 

R---22 Suction Line Pressure Drop (psig)

 

 

Size

 

OD

Drop

Velocity

 

 

 

Total Equivalent Line Length (ft)

 

 

 

(Btuh)

 

(in.)

(psi/100 ft)

Fpm

20

50

80

100

125

150

175

 

200

225

250

 

5/8

13.6

2563

3

7

11

14

17

20

24

 

27

31

34

18000

5/8

4.0

1539

1

2

3

4

5

6

7

 

8

9

10

 

3/4

1.5

1025

0

1

1

1

2

2

3

 

3

3

4

 

 

7/8

0.8

769

0

0

1

1

1

1

1

 

2

2

2

 

 

5/8

6.7

2052

1

3

5

7

8

10

12

 

13

15

17

24000

3/4

2.5

1367

1

1

2

3

3

4

4

 

5

6

6

 

7/8

1.3

1026

0

1

1

1

2

2

2

 

3

3

3

 

5/8

10.1

2565

2

5

8

10

13

15

18

 

20

23

25

30000

3/4

3.8

1708

1

2

3

4

5

6

7

 

8

9

9

 

7/8

1.9

1282

0

1

2

2

2

3

3

 

4

4

5

 

3/4

5.3

2050

1

3

4

5

7

8

9

 

11

12

13

36000

7/8

2.6

1538

1

1

2

3

3

4

5

 

5

6

7

 

 

1 1/8

0.7

902

0

0

1

1

1

1

1

 

1

2

2

 

 

3/4

7.0

2392

1

3

6

7

9

10

12

 

14

16

17

42000

7/8

3.5

1795

1

2

3

3

4

5

6

 

7

8

9

 

1 1/8

1.0

1053

0

0

1

1

1

1

2

 

2

2

2

 

3/4

8.9

2733

2

4

7

9

11

13

16

 

18

20

22

48000

7/8

4.4

2051

1

2

4

4

6

7

8

 

9

10

11

 

1 1/8

1.2

1203

0

1

1

1

2

2

2

 

2

3

3

 

7/8

6.7

2564

1

3

5

7

8

10

12

 

13

15

17

60000

1 1/8

1.8

1504

0

1

1

2

2

3

3

 

4

4

5

 

1 3/8

0.7

987

0

0

1

1

1

1

1

 

1

2

2

Line set application not recommended

Example 2

Jason is servicing a 5-ton R-22 air conditioner with 7/8” suction line. As part of his basic inspection he believes he has normal airflow because the air filters are clean, ductwork appears to be properly sized and in good shape and the evaporator coil is clean. He then checks the superheat and subcooling at the outdoor unit service valves. Taking pressures and temperatures he finds the following:

SLiquid line pressure = 260 psig S Liquid line temperature = 110°F S Suction line pressure = 60 psig

SSuction line temperature = 65°F

Using an R-22 PT relationship, Jason calculates the subcooling to be approximately 10°F with 30°F superheat. Because the subcooling is correct but the superheat appears to be high, he is concerned and decides to perform the Pseudo Evaporator Superheat check.

Examining the lineset, Jason finds approximately 145 ft of suction line with 4 long radius elbows. Per Fig. 33 and Table 7, each fitting has an equivalent length of 1.4 ft. The total equivalent length of the suction line is (145’ + (4 * 1.4’) ≈) 150 ft. Based on Table 9, Jason determines there should be 10-psig pressure-drop in the suction line.

Jason now takes the suction line temperature at the outlet of the evaporator and obtains 51°F. Per the instructions, Jason adds the 10-psig pressure-drop to the 60-psig pressure at the outdoor unit to get 70-psig at the evaporator. Saturated pressure of 70-psig equates to approximately 41°F. Jason determines the Evaporator superheat to be (51°F - 41°F =) 10°F. Jason concludes the TXV is functioning properly.

NOTE: In this situation, both the pressure drop and the heat gain in the suction line are significant contributions to the superheat at the service valve. The pressure drop contributes approximately 7°F superheat and the heat gain in the suction line contributes 13°F.

Fig. 33 – Pseudo Evaporator Superheat Pressure and Temperature Measurement Locations

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Contents Application Guideline Table of ContentsTWO Stage Communicating Table of Contents TWO Stage NON-COMMUNICATINGAIR Conditioner and Heat Pump Model Number Nomenclature Serial Number NomenclatureInstallation Guideline Safety ConsiderationsIntroduction Required Field-Installed Accessories for Air Conditioners AccessoriesRequired Field-Installed Accessories for Heat Pumps Accessory Descriptions LOW-AMBIENT Cooling Guideline Base / Mid-Tier / Deluxe 4-sided Baffle AssemblyDeluxe 3-sided Baffle Assembly and Dimensions Long Line Guideline Cabinet AssemblyBasic Cabinet Designs Access Compressor Or Other Internal Cabinet Components Legacy RNC and Legacy Line Control Box Identification Figure Labels LabelingElectrical Aluminum WireContactor CapacitorCrankcase Heater Time-Delay RelayCycle Protector Personal Injury Hazard Pressure SwitchesDefrost Control Board Defrost ThermostatDefrost Speedup Troubleshooting HK32EA001 If outdoor unit will not runIf defrost thermostat is stuck closed If defrost thermostat is stuck openQuiet Shift Five-Minute Compressor DelayCooling HeatingFan Motor Troubleshooting HK32EA003Compressor Plug Low-Voltage TerminalsMechanical Failures Compressor FailuresLocked Rotor Runs, Does Not PumpSplit Post Grommet part number KA75UG100 Noisy CompressorElectrical Failures Single-Phase MotorsUnit Personal Injury Hazard Refrigerant Refrigeration SystemCompressor Oil Servicing Systems on Roofs With Synthetic Materials Synthetic Roof Precautionary ProcedureBrazing Oil ChargingPumpdown Procedure Service Valves and PumpdownPersonal Injury and Unit Damage Hazard AccuRaterr Components Used in R-22 Heat Pumps Heating Piston AccuRaterr Heat Pumps OnlyReversing Valve Heating Mode, Solenoid De-Energized Reversing ValveLiquid Line Filter Drier Install Liquid-line Filter Drier Indoor ACSuction Line Filter Drier Accumulator AccumulatorThermostatic Expansion Valve TXV Install TXVTXV Operation Unit Operation HazardReplacing TXV on an Indoor Coil pre-2006 Make Piping ConnectionsReplacing TXV on Indoor Coil post-2006 Personal Injury and Environmental HazardLeak Detection Refrigeration System RepairCoil Removal Fire HazardSystem Clean-Up After Burnout Compressor Removal and ReplacementEvacuation Check ChargeDeep Vacuum Method Basic Diagnostics Troubleshooting with SuperheatLow Superheat with Normal or Low Suction Pressure Low Superheat with High Suction PressureHunting Superheat High Superheat with Normal or High Suction PressurePseudo Evaporator Superheat Instructions Example Puron System Suction Pressure Drop22 System Suction Pressure Drop Psig PuronrRefrigerant Pressure Temperature ChartPsig 22 Refrigerant Pressure Temperature RelationshipLiquid Line Temperature F Liq Press Subcooling F Psig Puron Subcooling ChartSuperheat F Psig Puron Superheat ChartLiquid Line Temperature F PT F Subcooling F Pres Psig 22 Subcooling Chart22 Superheat Chart Application Guidelines TWO-STAGEModel Plug Model Plug InformationLow Ambient Cooling General InformationDefrost Airflow Selection for 315AAV/355AAV FurnacesDefrost Hold Liquid-Line Solenoid AccessoryForced Defrost All 286A units must be charged in high stage onlyCooling and Heating Operation One Minute Stage Change Time Delay on 286ANA/187ANA ModelsUtility Interface With Evolution Control Compressor Operation on 286ANA/187ANA ModelsOutdoor Fan Motor Operation ECM Fan Motor TroubleshootingMuffler, Accumulator, Reversing Valve RVS Time DelaysThermistors Control BOX Troubleshooting 230v Brown-Out Protection Defeated 230V Line Power Disconnect DetectionCompressor Voltage Sensing Contactor Shorted DetectionTemperature Thermistors Unloader Test ProcedureFailed Thermistor Default Operation Thermistor Sensor ComparisonStatus Codes TroubleshootingEdge Thermidistat Models T6-PRH-01 or T6-NRH-01 TWO-STAGE 286B/289B/180B/187B General Information All 286B units must be charged in high stage only Heating Check Chart ProcedureCompressor Operation on 289B/180B Models Low Stage High Stage Low & High Model Troubleshooting 187B & 286B Start Circuit Incoming PowerControl Box Contactor And CapacitorTroubleshooting HK38EA015 circuit board 289B Compressor Thermal Cutout 286B Models Compressor Thermal CutoutOutdoor Coil Thermistor OCT Attachment Status Codes Single Stage Furnace with 2-Stage Air Conditioner Operating Ambient TWO Stage NON-COMMUNICATING 127A/226AAirflow Selections ECM Furnaces Airflow Selection for FV4C Fan Coils non-communicatingCompressor Operation System Function and Sequence of OperationDefrost Speedup Check Charge Airflow Selections for ECM Furnaces non communicating TWO Stage Communicating 167A/266AIndoor Thermostat Control Options Defrost Hold Evolution Controlled Low Ambient CoolingMajor Components Outdoor Fan Motor Operation Communication and Status Function LightsFor Evolution Control only, Green communications Comm Light 2230V Brown-Out Protection Defeated Thermistor Curve No 230V at Compressor ContactorOutdoor Coil Thermistor OCT Attachment Status Codes 167A / 266A TroubleshootingCare and Maintenance Puronr R-410A Refrigerant Quick Reference Guide Final Check-OutAIR Conditioner Troubleshooting Chart Heat Pump Troubleshooting Heating Cycle Heat Pump Troubleshooting Cooling Cycle Description Table # Index of TablesTWO-STAGE 286A/288A 180A/187A TWO-STAGE 286B/288B 180B/187BCatalog No. SM01---6
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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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