Bryant R-22 service manual Puron System Suction Pressure Drop, Example

Page 36

Table 6—Puron System Suction Pressure Drop

Nominal

 

Suction Line

Pressure

Suction

 

 

 

Puron 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

 

1/2

9.9

1649

2

5

8

10

12

15

17

20

22

25

18000

5/8

3.1

1018

1

2

2

3

4

5

5

6

7

8

 

 

3/4

1.2

678

0

1

1

1

1

2

2

2

3

3

 

 

1/2

16.7

2199

3

8

13

17

21

25

29

33

38

42

24000

5/8

5.2

1357

1

3

4

5

7

8

9

10

12

13

 

3/4

2.0

904

0

1

2

2

2

3

3

4

4

5

 

 

7/8

1.0

678

0

0

1

1

1

1

2

2

2

2

 

 

5/8

7.8

1696

2

4

6

8

10

12

14

16

18

20

30000

3/4

2.9

1130

1

1

2

3

4

4

5

6

7

7

 

7/8

1.5

848

0

1

1

1

2

2

3

3

3

4

 

5/8

10.9

2036

2

5

9

11

14

16

19

22

24

27

36000

3/4

4.1

1356

1

2

3

4

5

6

7

8

9

10

 

7/8

2.0

1017

0

1

2

2

3

3

4

4

5

5

 

5/8

14.1

2375

3

7

11

14

18

21

25

28

32

35

42000

3/4

5.4

1582

1

3

4

5

7

8

9

11

12

14

 

7/8

2.7

1187

1

1

2

3

3

4

5

5

6

7

 

 

1 1/8

0.8

696

0

0

1

1

1

1

1

2

2

2

 

 

3/4

6.9

1808

1

3

6

7

9

10

12

14

16

17

48000

7/8

3.5

1357

1

2

3

3

4

5

6

7

8

9

 

1 1/8

1.0

796

0

0

1

1

1

1

2

2

2

2

 

3/4

10.4

2260

2

5

8

10

13

16

18

21

23

26

60000

7/8

5.2

1696

1

3

4

5

6

8

9

10

12

13

 

1 1/8

1.4

995

0

1

1

1

2

2

3

3

3

4

Line set application not recommended

Example 1

While on a service call, after checking for proper indoor and outdoor airflow, Tom finds the following pressures and temperatures at the service valves of a Puron air conditioner:

SLiquid line pressure = 340 psig S Liquid line temperature = 97°F S Suction line pressure = 125 psig S Suction line temperature = 70°F

Using a Puron PT chart, the subcooling is determined to be 8°F, which is within ±3 of the 10°F listed on the rating plate. Tom believes the charge is correct. He calculates the superheat to be approximately 27°F superheat. The apparently high superheat has Tom concerned.

Tom uses the Pseudo Evaporator Superheat method to check the TXV performance. The system is a 3-ton Puron air conditioner with 75 feet equivalent length of 3/4” suction line. Based on Table 6, the system has approximately 3-psig pressure drop in the vapor line. Per the instructions, he takes the suction line temperature at the outlet of the evaporator and finds it to be 53°F. Tom adds 3 psig to the 125-psig suction pressure at the outdoor unit to get 128 psig evaporator pressure. The saturated pressure of 128 equates to 44°F. Tom calculates the evaporator superheat to be (53°F - 44°F =) 9°F. The TXV appears to be operating properly.

NOTE: The additional superheat at the compressor is due principally to heat gain in the 75 feet of suction line with a minor contribution by the pressure drop. Because the suction line of the lineset was the same size as the vapor service valve fitting and less than 80 feet, Tom could have ignored the pressure drop in the suction line and obtained the evaporator superheat by using the vapor service valve pressure of 125 psig (saturated temperature = 43°F) and the evaporator outlet temperature of 53°F. The evaporator superheat is calculated to be (53°F – 43°F =) 10 °F.

36

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Contents Table of Contents Application GuidelineTable of Contents TWO Stage NON-COMMUNICATING TWO Stage CommunicatingAIR Conditioner and Heat Pump Model Number Nomenclature Serial Number NomenclatureSafety Considerations Installation GuidelineIntroduction Accessories Required Field-Installed Accessories for Air ConditionersRequired Field-Installed Accessories for Heat Pumps Accessory Descriptions Base / Mid-Tier / Deluxe 4-sided Baffle Assembly LOW-AMBIENT Cooling GuidelineDeluxe 3-sided Baffle Assembly and Dimensions Cabinet Assembly Long Line GuidelineBasic Cabinet Designs Access Compressor Or Other Internal Cabinet Components Legacy RNC and Legacy Line Control Box Identification Labeling Figure LabelsAluminum Wire ElectricalContactor CapacitorTime-Delay Relay Crankcase HeaterCycle Protector Pressure Switches Personal Injury HazardDefrost Thermostat Defrost Control BoardTroubleshooting HK32EA001 If outdoor unit will not run Defrost SpeedupIf defrost thermostat is stuck closed If defrost thermostat is stuck openFive-Minute Compressor Delay Quiet ShiftCooling HeatingTroubleshooting HK32EA003 Fan MotorCompressor Plug Low-Voltage TerminalsCompressor Failures Mechanical FailuresLocked Rotor Runs, Does Not PumpNoisy Compressor Split Post Grommet part number KA75UG100Single-Phase Motors Electrical FailuresUnit Personal Injury Hazard Refrigeration System RefrigerantCompressor Oil Synthetic Roof Precautionary Procedure Servicing Systems on Roofs With Synthetic MaterialsBrazing Oil ChargingService Valves and Pumpdown Pumpdown ProcedurePersonal Injury and Unit Damage Hazard Heating Piston AccuRaterr Heat Pumps Only AccuRaterr Components Used in R-22 Heat PumpsReversing Valve Reversing Valve Heating Mode, Solenoid De-EnergizedInstall Liquid-line Filter Drier Indoor AC Liquid Line Filter DrierSuction Line Filter Drier Accumulator AccumulatorInstall TXV Thermostatic Expansion Valve TXVTXV Operation Unit Operation HazardMake Piping Connections Replacing TXV on an Indoor Coil pre-2006Replacing TXV on Indoor Coil post-2006 Personal Injury and Environmental HazardRefrigeration System Repair Leak DetectionCoil Removal Fire HazardCompressor Removal and Replacement System Clean-Up After BurnoutCheck Charge EvacuationDeep Vacuum Method Troubleshooting with Superheat Basic DiagnosticsLow Superheat with Normal or Low Suction Pressure Low Superheat with High Suction PressureHigh Superheat with Normal or High Suction Pressure Hunting SuperheatPseudo Evaporator Superheat Instructions Puron System Suction Pressure Drop Example22 System Suction Pressure Drop PuronrRefrigerant Pressure Temperature Chart Psig22 Refrigerant Pressure Temperature Relationship PsigPuron Subcooling Chart Liquid Line Temperature F Liq Press Subcooling F PsigPuron Superheat Chart Superheat F Psig22 Subcooling Chart Liquid Line Temperature F PT F Subcooling F Pres Psig22 Superheat Chart TWO-STAGE Application GuidelinesModel Plug Model Plug InformationGeneral Information Low Ambient CoolingDefrost Airflow Selection for 315AAV/355AAV FurnacesLiquid-Line Solenoid Accessory Defrost HoldForced Defrost All 286A units must be charged in high stage onlyOne Minute Stage Change Time Delay on 286ANA/187ANA Models Cooling and Heating OperationUtility Interface With Evolution Control Compressor Operation on 286ANA/187ANA ModelsECM Fan Motor Troubleshooting Outdoor Fan Motor OperationTime Delays Muffler, Accumulator, Reversing Valve RVSThermistors Control BOX Troubleshooting 230V Line Power Disconnect Detection 230v Brown-Out Protection DefeatedCompressor Voltage Sensing Contactor Shorted DetectionUnloader Test Procedure Temperature ThermistorsFailed Thermistor Default Operation Thermistor Sensor ComparisonTroubleshooting Status CodesEdge Thermidistat Models T6-PRH-01 or T6-NRH-01 TWO-STAGE 286B/289B/180B/187B General Information Heating Check Chart Procedure All 286B units must be charged in high stage onlyCompressor Operation on 289B/180B Models Low Stage High Stage Low & High Model Incoming Power Troubleshooting 187B & 286B Start CircuitControl Box Contactor And CapacitorTroubleshooting HK38EA015 circuit board 286B Models Compressor Thermal Cutout 289B Compressor Thermal CutoutOutdoor Coil Thermistor OCT Attachment Status Codes Single Stage Furnace with 2-Stage Air Conditioner TWO Stage NON-COMMUNICATING 127A/226A Operating AmbientAirflow Selections ECM Furnaces Airflow Selection for FV4C Fan Coils non-communicatingSystem Function and Sequence of Operation Compressor OperationDefrost Speedup Check Charge TWO Stage Communicating 167A/266A Airflow Selections for ECM Furnaces non communicatingIndoor Thermostat Control Options Evolution Controlled Low Ambient Cooling Defrost HoldMajor Components Communication and Status Function Lights Outdoor Fan Motor OperationFor Evolution Control only, Green communications Comm Light 2230V Brown-Out Protection Defeated No 230V at Compressor Contactor Thermistor CurveOutdoor Coil Thermistor OCT Attachment 167A / 266A Troubleshooting Status CodesCare and Maintenance Final Check-Out Puronr R-410A Refrigerant Quick Reference GuideAIR Conditioner Troubleshooting Chart Heat Pump Troubleshooting Heating Cycle Heat Pump Troubleshooting Cooling Cycle Index of Tables Description Table #TWO-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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