Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual
87
Notes:
(1) Remote Start/Remote Stop: takes effect in remote control mode.
(2) When there is no water flow, Water Switch is set to OFF. Otherwise, it is set to ON.
(3) After contactors work properly during the compressor operation, Contactor Protection is switched
from OFF to ON.
9.6 Fault Alarm Function
Fault
System's Determination
Criteria
System's
Handling Method
Possible Causes
Rectifying Way
Water flow failure
After the water pump
runs for 3 minutes, the
water flow switch trips
out for 5 seconds.
Stop the unit.
The water flow is too small.
The water flow switch is
inserted in a wrong position.
The water flow switch is
inserted in a shallow position.
The water flow switch is faulty.
The wiring is loose.
Manual
Anti-freeze
protection
The
anti-freeze
protection switch trips
out for 3 seconds.
Stop the unit.
The water temperature is lower
than 3°C.
The anti-freeze switch is faulty.
The wiring is loose.
Manual
High
pressure
alarm
The high pressure switch
trips out for 3 seconds.
Stop the unit.
The discharge pressure of the
unit is too high.
The high pressure switch is
faulty.
The wiring is loose.
Manual
Low
pressure
alarm
The low pressure switch
trips out for 1 second.
Stop the unit.
The suction pressure of the
unit is too low.
The low pressure switch is
faulty.
The wiring is loose.
Manual
Compressor
interior protection
alarm
The compressor interior
protection switch trips
out for 3 seconds.
Stop the unit.
The motor temperature is too
high.
The motor runs reversely.
The power supply has an open
phase.
The three-phase voltage is
unbalanced.
The
compressor
interior
protection switch is faulty.
The wiring is loose.
Manual
