Emerson Fluid Chiller Guía para resolver problemas Pagina 63
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Superheat Is Too Low -- TXV Feeds Too Much
ProblemSymptomsCauses Corrective Action
Valve Feeds
To o Much
1) Liquid Slugging
2) Low Superheat
3) Suction Pressure Normal or High
Oversized ValveReplace with correct size valve
Incorrect Superheat SettingAdjust the superheat to correct setting
Moisture
Replace the filter-driers; evacuate the system
and replace the refrigerant
Dirt or Foreign Material Clean out the material or replace the valve
Incorrect Charge SelectionSelect proper charge based on refrigerant type
Incorrect Bulb LocationRelocate the bulb to proper location
Incorrect Equalizer Location Relocate the equalizer to proper location
Plugged Equalizer (Balanced Port Valve) Remove any restriction in the equalizer tube
Superheat Is Too High -- TXV Doesn't Feed or Doesn't Feed Enough
ProblemSymptomsCauses Corrective Action
Valve
Doesn't
Feed or
Doesn't
Feed
Enough
1) Evaporator
Te mperature Too High
2) High Superheat
3) Low Suction Pressure
Short of RefrigerantAdd correct amount of refrigerant
High SuperheatChange superheat setting
Flash Gas In Liquid Line Remove source of restriction
Low or Lost Bulb Charge Replace power element or valve
Moisture
Replace driers or evacuate the system and
replace refrigerant
Plugged Equalizer (Conventional Valve) Remove restriction in equalizer tube
Insufficient Pressure Drop or Valve To o
Small
Replace existing valve with properly sized valve
Dirt or Foreign Material Clean out material or replace valve
Incorrect Charge SelectionSelect correct charge
Incorrect Bulb LocationMove bulb to correct location
Incorrect Equalizer Location Move equalizer to correct location
Charge Migration (MOP Only, Vapor
Charges)
Move valve to a warmer location or apply heat
t
ape to powerhead
WaxUse charcoal drier
Wrong equalizer Type ValveUse externally equalized valve
Rod Leakage (Balanced Port Valve) Replace valve
Heat Damaged PowerheadReplace powerhead or valve
No Superheat At Start Up Only
ProblemSymptomsCauses Corrective Action
Valve Feeds
To o Much At
Start Up
1) Liquid Slugging
2) Zero Superheat
3) Suction Pressure To o High
Refrigerant Drainage
Use pump down control; Install trap at the top
of the evaporator
Compressor or Suction Line in a Cold
Location
Install crankcase heater; Install suction solenoid
Partially Restricted or Plugged External
Equalizer (Balanced Port Valve)
Remove restriction
Liquid Line Solenoid Won't Shut Replace powerhead or valve
Superheat Is Erratic Or Hunts
ProblemSymptomsCauses Corrective Action
System
Hunts or
Cycles
1) Suction Pressure Hunts
2) Superheat Hunts
3) Erratic Valve Feeding
Bulb Location IncorrectRepositi
on Bulb
Valve Too Large Replace with correctly sized valve
Incorrect Superheat SettingAdjust superheat to correct setting
System Design Redesign system
Troubleshooting Expansion Valves
- Technical 1
- Help Guide 1
- Introduction 3
- Table of Contents 4
- Thermal Expansion 5
- Thermal Expansion Valves 6
- Internal Equalizer 6
- Factory Settings of TXVs 7
- External Equalizer 7
- Superheat 9
- Approximate Methods 9
- Superheat Adjustment 9
- TXV Selection 10
- Application Tips 11
- Remote Bulb Well 11
- Remote Bulb Location 11
- Operation at Reduced Capacity 12
- Gas & Gas Cross-Charges 14
- Which Charge to Use? 14
- Adsorption Charges 14
- Liquid Cross-Charges 14
- Other TXV Considerations 15
- Refrigerant Code Names 16
- Emerson MOP 16
- TXV Charge Code Selector 17
- Electronic Valves 18
- & Controls 18
- Electronic Valve Applications 19
- Emerson Climate Technologies 20
- EC3-32 and EC3-33 Systems 20
- Temperature Sensor ECN-N60 20
- Pressure Transmitter – PT4 21
- TXV Controller – EC3-X32 21
- TXV Controller – EC3-X33 22
- Universal Driver – EXD-U00 22
- XEV22 Superheat Controller 22
- Electrical Control Valve – EX 23
- Third Party Controller 23
- Electronic Valves Programming 24
- Solenoid Valves 25
- What Are Solenoid Valves? 26
- 2. Pilot Operated Valve 27
- Types of Solenoids 27
- 2-Way Valves 27
- Solenoid Valve Selection 28
- Application Overview 29
- System Protectors 30
- Absorption vs. Adsorption 32
- Types of Filter driers 32
- Dirt, Waxes, Acid 32
- Sightglass 33
- Suction Filter Driers 34
- Internal Design 35
- Compressor Burnout 36
- Filter Driers for Heat Pumps 37
- Removing Contaminants 37
- One-Way Flow, Both Directions 37
- Simplifying While Servicing 38
- Emerson System Protectors 38
- Regulators 39
- EVAPORATOR 40
- INTERMEDIATE 40
- Figure 3: EPRB(S) Brass Body 41
- (Emerson EPRB) 42
- HeadMaster HP Operation 43
- solenoid VAlVe 46
- Figure 8 47
- Adjusting the Set Point 48
- Oil Controls 49
- Emerson Oil Controls 50
- Temperature 51
- Pressure Controls 51
- Temperature Pressure Controls 52
- TS1 Introduction 52
- Housing Variants 52
- Temperature Sensing 52
- Setpoints 53
- Electrical Contacts 53
- Contact Function 53
- PSC Pressure Switch 56
- PSC Introduction 56
- FSX Introduction 57
- Basic Rules of 58
- Good Practice 58
- Basic Rules of Good Practice 59
- Troubleshooting 61
- SYSTEM TROUBLESHOOTING GUIDE 62
- No Superheat At Start Up Only 63
- Superheat Is Erratic Or Hunts 63
- Troubleshooting Ball Valves 68
- Troubleshooting Regulators 69
- R404A/R507A 70
- Wholesaler/Contractor Support 72
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