Emerson Fluid Chiller Guía para resolver problemas Pagina 66
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62
EC3-X33 TROUBLESHOOTING – (Controller with Computer)
Symptom Cause Action
Superheat is several degrees
higher or lower than set-point
Incorrect signal from pressure or
temperature sensors
1. Check the sensors
2. Make sure ECN-Nxx temperature sensor is used
3. For optimum accuracy, please use:
PT4-07S for R22/R134a/R507/R404A/R407C/R124
PT4-18S for R410A or for economizer applications
PT4-30S for R744
4. Make sure the sensor cables are not installed along with
other high voltage cables (keep minimum 1.5 inch away)
Superheat is too low
i.e. compressor wet running
1. Incorrect wiring of ECVs
2. Defective sensors
1. Check the wiring
2. Check the sensor
Valve is not fully closing
1. The digital input is ON (24V)
2. Wrong setting of parameter ut
1. Valve is shut off only when the digital input is turned off
(0V)
2. Check the setting of parameter ut
Instable superheat (hunting)
Uneven refrigerant distribution or
evaporator with very long length/
time constant
Evaporator is designed to operate
at higher superheat
Change superheat control mode from standard to slow
Increase the superheat set-point
Valve opens when EC3
commands to close and vice
versa
Wrong wiring between EC3-X32
and valve
Correct the wiring
EX8 is not able to open at
high differential pressure
Wrong setting of parameter ut Check the parameter ut. (Larger valve requires higher
torque and higher current)
Superheat set-point is shift-
ing after several months of
uninterrupted operation or
permanent jumper of 24V
digital input
Stepper motor driven valves
require synchronization
Do not apply permanent 24V digital input. Interrupt digital
input once every week for 5 seconds if compressor never
stops
Not able to get data on PC
monitor
No connection or improper
connection between PC and
EC3-X32
Wrong electrical plug
EC3-X32 and PC are not in a logi-
cal network
Check the network wiring
Use RJ45 only (RJ11 is not suitable)
Check TCP/IP conguration of Windows(2000, XP or
Vista)
EC3-X32 does not show any
life
Wrong supply voltage applied Change EC3-X32
EC3-X32 internal stepper
motor chip is burn out
Short circuit of output terminals
(for connection to ECV) or short
circuit between output terminal
with ground
Change EC3-X32
Troubleshooting Electronic Valves & Controls
- 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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