Operating instruction
EC3-X32 Superheat Controller with TCP/IP
communication capability
Emerson Climate Technologies GmbH www.emersonclimate.eu
Am Borsigturm 31 I 13507 Berlin I Germany Date: 03.04.2017 EC3-X32_OI_ML_R13_865008.docx
Error/Alarm handling:
Alarm
code
Description
Related
parameter
Alarm
relay
Valve What to do?
Requires manual
reset after resolving
alarm
E0
Pressure transmitter
error
- Signaling Fully close Check wiring connection and measure the signal 4…20 mA. No
E1
- Signaling Fully close Check wiring connection and measure the resistance of sensor. No
AΠ
EXV electrical
connection error
- Signaling - Check wiring connection and measure the resistance of winding. No
Battery error
Battery potentially does not have enough charge to close valve in
case of main power supply interruption. May occur temporarily
with new controllers or after long storage but should disappear
when battery is charged sufficiently. If Ab remains active even
when battery is charged, battery may be defective and should be
replaced. (Replacement kit: 807 790).
Ab blinking
b1: 3 Signaling Fully close Yes
AE blinking
cannot
P6: 1 Signaling -
Allocate the source, which does not let suction pressure drops
below desired set-point.
Yes
Freeze protection
Check the system for cause of low pressure such as insufficient
load on evaporator.
Low superheat
(<0,5K)
Check wiring connection and operation of valve.
uL: 2 Signaling Fully close Yes
AH
High superheat uH: 1 Signaling Fully close Check the system. No
AP
Low pressure
Check the system for cause of low pressure such as refrigerant
loss.
Er
Data error display -
out of range
- - -
Data send to the display is out of range. Check temperature and
pressure sensor.
No
---
No data to display - - -
Check Cable and plug connection between EC3-X… and
ECD-002.
No
Note: When multiple alarms occur, the highest priority alarm is displayed until being cleared, then the next highest alarm is displayed until all alarms are cleared. Only then
will parameters be shown again.
Checking system operating conditions using local display/keypad ECD-002:
The data to be permanently shown on the display can be selected by the user (parameter ┌┘1). It is possible to temporarily display these values. However this function is
not available in an alarm condition. The display will show for one second the numerical identifier of the data (see ┌┘1 parameter) and then the selected data. After 5 minutes,
the display will return to the value selected by parameter ┌┘1.
Service / Troubleshooting:
Symptom Cause Action
Operating superheat is several degrees higher or lower than
set-point
Incorrect signal from pressure or
temperature sensors
2- Make sure ECN-N60 temperature sensor is used.
3- For optimum accuracy, please use:
PT5-07x (for R22 / R134a / R507 / R404A / R407A / R407C /
R407F / R124 / R448A /R449A / R450A / R513A /
R1234ze)
PT5-18x (for R410A/ R32)
PT5-30x (for R410A / R744 / R32)
PT5-50x (for R744)
4- Make sure the sensor cables are not installed along with other
Operating 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 closed
1- The digital input is ON (24 V)
2- Wrong setting of parameter ut.
1- Valve is shut off only when the digital input is turned off (0 V).
2- Check the setting of parameter ut.
Instable superheat (hunting)
Evaporator is designed to operate at
higher superheat
Increase the superheat set-point.
Valve opens when EC3 commands to close and vice versa
Wrong wiring between EC3-X3...
and valve
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 shifting after several months of
uninterrupted operation or permanent jumper of 24 V
Stepper motor driven valves require
synchronization
Do not apply permanent 24 V digital input. Interrupt digital input
once every week for 5 seconds if compressor never stops.
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