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2014TechnicalHelp Guide Thermal Expansion ValvesElectronic Valves & ControlsSolenoid ValvesSystem ProtectorsRegulatorsOil ControlsTemperature Pres

6Thermal Expansion ValvesEmerson Climate Technologiessible to determine that the cause of the trouble call is because of improper methods of instrumen

7Thermal Expansion ValvesEmerson Climate TechnologiesApplication TipsFor best evaporator performance, the TXV should be installed as close to the evap

8Thermal Expansion ValvesEmerson Climate TechnologiesLarge uctuations in superheat in the suction gas are usually the result of trapped liquid at the

9Thermal Expansion ValvesEmerson Climate TechnologiesBalanced Port TXV OperationIn conventional TXVs, as the pressure drop across the TXV port changes

10Thermal Expansion ValvesEmerson Climate TechnologiesREFRIGERANT CODE NAMESARI Standard 750-2007 recommends thefollowing color coding of the TXVs:R-1

11Thermal Expansion ValvesEmerson Climate TechnologiesOther TXV ConsiderationsSolenoid Liquid Stop ValvesThe TXV is produced as a tight seating device

12Thermal Expansion ValvesEmerson Climate TechnologiesTo help you match the correct charge to your specic application, see the TXV Charge Code Select

13Thermal Expansion ValvesEmerson Climate Technologies HW35 AIR CONDITIONING COMMERCIAL REFRIGERATION LOW TEMPERATURE OLD CHARGE REPLA

14Electronic Valves& Controls

Emerson Climate Technologies15Electronic Valves & ControlsEmerson Climate TechnologiesElectronic Valve ApplicationsValves can be used for a variet

Emerson Climate Technologies16Electronic Valves & ControlsEmerson Climate TechnologiesParts Required for Electronic Valves when used as TXV and Dr

Emerson Climate Technologies17Electronic Valves & ControlsEmerson Climate TechnologiesPressure Transmitter – PT4The heart of the transmitter is a

Emerson Climate Technologies18Electronic Valves & ControlsEmerson Climate Technologiesunder different operating conditions such as com-pressor sta

Emerson Climate Technologies19Electronic Valves & ControlsEmerson Climate TechnologiesFunctionDip Switch Number1 2 3 4 5 6 7 8EX4/EX5/EX6 operatio

Emerson Climate Technologies20Electronic Valves & ControlsEmerson Climate TechnologiesCOMPONENTAPPLICATIONTXVLIQUIDINJECTIONHOTGASHEADPRESSURE EPR

21Solenoid Valves

22Solenoid ValvesEmerson Climate TechnologiesDirect Acting Solenoid AnatomyWhat Are Solenoid Valves?A solenoid valve consists of two distinct but inte

23Solenoid ValvesEmerson Climate TechnologiesFigures 1A and 1B show a simple schematic of a Direct Acting Solenoid Valve in operation.2. Pilot Operate

24Solenoid ValvesEmerson Climate TechnologiesSolenoid Valve SelectionThe selection of a Solenoid Valve for a control ap-plication requires the followi

25Solenoid ValvesEmerson Climate TechnologiesInstallation Solenoid Valves having a spring loaded piston or dia-phragm may be installed and operated i

Introduction This Technical Guide from Emerson Climate Technologies provides a detailed explanation on the operation of common refrigeration system c

26System Protectors

27System ProtectorsEmerson Climate TechnologiesAcid Pick-Up CapabilityVarious organic acids result during the decomposition of the refrigerant and oil

28System ProtectorsEmerson Climate TechnologiesCompacted bead style lter drier, Emerson’s EK-PlusAbsorption vs. AdsorptionOne factor to consider in s

29System ProtectorsEmerson Climate TechnologiesRefrigerant Water Concentration (ppm)00.050.10.150.20100 200 300 400500 600700Total Acid NumberHFC Refr

30System ProtectorsEmerson Climate TechnologiesEKTypical drierSolid Contamination CapturedFlow RestrictionThe lter driers for use in HFC and POE oil

31System ProtectorsEmerson Climate TechnologiesCross-section shows desiccant beads surrounding accordion-type lter elementTypical system arrangements

32System ProtectorsEmerson Climate TechnologiesClean-Up Procedure for Compressor Motor Burnout1. Determine the extent of the burnout. For mild burnou

33System ProtectorsEmerson Climate TechnologiesSchematic of a basic heat pump system.Filter Driers for Heat PumpsA heat pump is essentially a refriger

34System ProtectorsEmerson Climate TechnologiesBi-directional components allow simplication of systemCross section showing BFK internal componentsSim

35Regulators

Table of ContentsThermal Expansion Valves ... 1 Internal Equalizer ... 2

36RegulatorsEmerson Climate TechnologiesEVAPORATORPRESSUREREGULATOREVAPORATORPRESSUREREGULATOREXTERNALSTRAINERRECOMMENDEDNOTE: HIGH SIDE PILOTPRESSURE

37RegulatorsEmerson Climate TechnologiesUpstream RegulatorsThe sole function of the Evaporator Pressure Regu-lator is to prevent the evaporator pressu

38RegulatorsEmerson Climate TechnologiesFig 4. Cutaway of crankcase pressure regulator (Emerson OPR)Fig 5. Cutaway of evaporator pressure regulator (

39RegulatorsEmerson Climate TechnologiesHeadMaster Head Pressure ControlsThe application of air-cooled condensers for year-round operation, or during

40RegulatorsEmerson Climate TechnologiesNOTE: Should the outdoor temperature fall below de-sign conditions, more refrigerant will be required.The tota

41RegulatorsEmerson Climate TechnologiesHP Parallel PipingHot Gas BypassDemand continues to mount for improved comfort conditioning combined with lowe

42RegulatorsEmerson Climate TechnologiesFigure 7: Direct acting hot gas regulator admitting ow between TEV and venturi distributor.Applications: Hot

43RegulatorsEmerson Climate TechnologiesThermal Valves for Liquid InjectionWhen hot gas is bypassed directly into the suction line, it is necessary to

44RegulatorsEmerson Climate TechnologiesApplication Tips • In systems that use a Venturi type distributor, the bypass gas should be fed into the syste

45Oil Controls

1Thermal Expansion Valves

Emerson Climate Technologies46Oil ControlsEmerson Climate TechnologiesOMBCommon SuctionToCondenserFilter-DrierCompressorDischargeOMBOMBOMBOil Separato

47TemperaturePressure Controls

Emerson Climate TechnologiesEmerson Climate TechnologiesTemperature-Pressure Controls48Emerson Climate TechnologiesTemperature Pressure ControlsTemper

Emerson Climate TechnologiesEmerson Climate Technologies49Temperature-Pressure ControlsEmerson Climate Technologies+-241+-241Adsorption Charge – Senso

Emerson Climate TechnologiesEmerson Climate TechnologiesTemperature-Pressure Controls50Emerson Climate TechnologiesFor operational safety, all TS1 wit

Emerson Climate TechnologiesEmerson Climate Technologies51Temperature-Pressure ControlsEmerson Climate TechnologiesSetpointsPS1/PS2 are adjustable con

Emerson Climate TechnologiesEmerson Climate TechnologiesTemperature-Pressure Controls52Emerson Climate TechnologiesPSC Pressure SwitchThe Emerson PSC

Emerson Climate TechnologiesEmerson Climate Technologies53Temperature-Pressure ControlsEmerson Climate TechnologiesFSX IntroductionFSX electronic spee

54Basic Rules ofGood Practice

55Basic Rules of Good PracticeEmerson Climate TechnologiesDOsDO maintain test instruments in good working order and periodically check them against ac

2Thermal Expansion ValvesEmerson Climate TechnologiesP1 = 45.4 PSIGP2 = 35 PSIGP3 = 10.4 PSIG35 PSIG = 40°F35 PSIG = 40°F35 PSIG = 50°FBCTXV with inte

56Basic Rules of Good Practice Emerson Climate TechnologiesDON’Ts DON’T be a “parts-changer.” Analyze problems based on the symptoms, and determine th

57TroubleshootingGuide

58SystemProblemDischargePressureSuctionPressureSuperheat Subcooling AmpsOverchargeUnderchargeLiquidRestriction(Drier)LowEvaporatorAirowDirtyCondenser

59Superheat Is Too Low -- TXV Feeds Too MuchProblemSymptomsCauses Corrective ActionValve FeedsTo o Much1) Liquid Slugging2) Low Superheat3) Suction Pr

60Symptom Possible Cause Action RemarkValve is not movingDigital input has priority to analogue signal inputDigital input must be activated and deacti

61EC3-X33 TROUBLESHOOTING – (Controller with Keypad)Symptom Cause ActionSuperheat is several degrees higher or lower than set-pointIncorrect signal fr

62EC3-X33 TROUBLESHOOTING – (Controller with Computer)Symptom Cause ActionSuperheat is several degrees higher or lower than set-pointIncorrect signal

63Troubleshooting Solenoid ValvesProblemCausesCorrective ActionNormally Closed Valve Will Not Open-or-Normally Open Valve Will Not CloseMovement of pl

64Symptoms Causes Corrective ActionDoesn't Flow Valve Isn't Open Turn StemLeak at Access Schrader Valve Schrader Valve Isn't Tight Tigh

65Problem Causes Corrective ActionValve Won't Adjust or Is Erratic Dirt under seatWith system running, open the valve adjustmentto open the valve

3Thermal Expansion ValvesEmerson Climate Technologies Changes in load cause the TXV pin to move:• Increasing the superheat will cause the TXV to ope

66Problem Causes Corrective ActionCompressor tripping on Internal ThermalProtector - Fails to Start-Up and Run LongEnough to Pull Down TemperatureCPR

67Troubleshooting Oil Controls - OMBTroubleshooting Oil SeparatorsProblemCausesCorrective ActionReduced or No Oil Feed to CompressorOil outlet valve c

EmersonClimate.com/owcontrolsWholesaler/Contractor SupportCustomer Service: 1-866-298-2482Technical Support: 1-866-625-84162004FC-141 R10 (6/14) Emer

4Thermal Expansion ValvesEmerson Climate TechnologiesThis change from 10°F to 11°F in the operating superheat is caused by the change in the pressure

5Thermal Expansion ValvesEmerson Climate TechnologiesP1 = 45.5 PSIGP2 = 35 PSIGP3 = 10.4 PSIG35 PSIG = 40°F35 PSIG = 40°F35 PSIG = 50°FBCTXV with inte