Envicool EMW90HDNC1U - Alarm Handling

User Manual
7 Fault Management
EMW90HDNC1U Air-cooled Chiller
39
Alarm Name
Generation
Condition
Possible Causes Processing Method
The external circulation
fan is powered off, or it
works abnormally.
Repair or replace the external
circulation fan when it is not
caused by power failure.
Condenser is badly dirty
and blocked.
Clean the condenser.
CAN
Communicati
on Failure
Failed to
communicate with the
host computer using
CAN protocol.
Communication cable is
damaged.
Replace the communication
cable.
Communication line port
connection error.
Reconnect communication
lines.
The communication baud
rate of chiller is different
from that of host
computer.
Set the chiller to use the same
communication baud rate as the
host computer.
Water Outlet
Pressure
Failure
Outlet coolant
pressure sensor
cannot detect
pressure.
The electric control wiring
of the outlet pressure
sensor is loose or
damaged.
Fasten or replace the electrical
control wiring.
Water Inlet
Pressure
Failure
Inlet coolant pressure
sensor cannot detect
pressure.
Loose or damaged
electric control wiring of
inlet coolant pressure
sensor.
Fasten or replace the electrical
control wiring.
Water Outlet
Pressure Too
High
Outlet coolant
pressure is greater
than high pressure
alarm set value.
The coolant circulation
system is blocked.
Check the coolant circulation
system.
Excessive cooling
medium.
Discharge part of cooling
medium to relieve pressure.
Add Water
Alarm
The inlet coolant
pressure in the chiller
system is lower than
the alarm set value.
Coolant quantity of
chillers is insufficient.
Add the coolant with the coolant
filling pump.
AC
Overvoltage
The input power
supply voltage is
higher than the
overvoltage setting.
The power supply
network is unstable.
Check the power supply
network.
If it is confirmed that it is a
power grid problem, it is
recommended to equip the
chiller with a power stabilizer.
AC
Undervoltage
The input power
supply voltage is
lower than the
undervoltage setting.
The power supply
network is unstable.
Check the power supply
network.
If it is confirmed that it is a
power grid problem, it is
recommended to equip the
chiller with a power stabilizer.
System High
Pressure
Alarm
Locking
Three system
high-pressure alarms
occurred within one
hour.
Outdoor temperature is
too high.
Check the outdoor temperature.
Loose wiring of high
pressure switch or
damaged cable.
Tighten the electrical control
wiring or replace the cable.