Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual
88
Low
oil
level
protection
The oil level switch trips
out for 60 seconds.
Stop the unit.
The oil level of the compressor
is too low.
The oil level switch is faulty.
The wiring is loose.
Manual
Oil
pressure
difference
protection
After the unit starts
running, the oil pressure
difference
protection
switch trips out for 30
seconds.
Stop the unit.
The oil filter is blocked.
The oil pressure switch is
faulty.
The wiring is loose.
Manual
Compressor
overload
The
compressor's
thermal overload relay
trips out for 3 seconds.
Stop the unit.
The compressor is overloaded.
The thermal overload relay's
switch is faulty.
The wiring is loose.
Manual
Fan overload
The
fan's
thermal
overload relay trips out
for 3 seconds.
Stop the unit.
The fan is overloaded.
The thermal overload relay's
switch is faulty.
The wiring is loose.
Manual
Power
supply
failure
The power protection
module trips out for 3
seconds.
Stop the unit.
The three-phase voltage power
supply is unbalanced.
The voltage is too low.
The voltage is too high.
The phase is reversed or lost.
The power protection module
is faulty.
The wiring is loose.
Manual
Contactor
protection
After the compressor
runs for 10 seconds, the
contact
feedback
protection switch trips
out for 0.1 second.
Stop the unit.
The absorption of the contactor
is unstable.
The
control
wire
of
the
contactor is loose.
The absorption of the middle
relay before the contactor is
unstable.
The normally closed contacts
of the thermal relay are
unstable, or the thermal relay
trips out incompletely.
Manual
High temperature
of discharge air
The
discharge
air
temperature keeps being
higher than 110°C for 10
seconds.
Stop the unit.
Manual
Open
circuit
of
outlet
water
temperature
sensor
The PT100's resistance
is greater than 300
Ω
.
Stop the unit.
Manual
