75
No.
Alarm name
Common causes
Corrective measures
4
1#
Condensing
overtemperat-
ure lockout
2#
Condensing
overtemperat-
ure lockout
•
The
condenser
is
severely dirty and
clogged.
•
Clogging
of
the
return air outlet of
the unit with debris.
•
The
fan
is
not
working
when
the
power is off.
•
Flush the condenser and finish
cleaning
when
the
water
draining from the drain hole
becomes clear.
•
Remove debris from the return
air outlet.
•
Check the working condition of
the fan.
5
High
discharge
pressure
•
There is a blockage
in
the
coolant
circulation system.
•
Excess coolant.
•
Check
for
the
presence
of
foreign bodies in the circulation
system pipework.
•
Open the drain valve to drain a
small amount of coolant.
6
Low water
inlet pressure
Insufficient coolant.
•
Connect the refill kit for refilling.
7
Water high
temperature
alarm
•
Malfunction
of
compressor,
electronic expansion
valve,
circulating
water pump or fan.
•
Coolant leaks.
•
Check
the
status
of
the
compressor,
electronic
expansion
valve,
circulating
water pump or fan.
•
Check for leaks and refill after
repairs.
8
Water low
temperature
alarm
Circulating water pump
or electric heating
failure.
•
Check
the
status
of
the
circulating
water
pump
and
electric heating.
9
Mains power
failure
•
Incorrectly
wired
power
supply
causing
reverse
phase.
•
Loose wiring in one
phase of the circuit
breaker
causes
a
phase loss.
•
Over-
or
under-
voltage
due
to
instability
in
the
power supply grid.
•
Connect the power cable to the
unit correctly.
•
Fasten
the
electrical
control
wiring of the input power supply.
•
Check the power supply grid. If
it is confirmed that the grid is the
problem, it is recommended to
have a voltage regulator.
Operation & Maintenance Instruction
Содержание ST2752UX
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