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microKool Portable Chillers UGH004/0999
6-4 TROUBLESHOOTING
SHUT DOWN
ALARMS
Alarm
The pump motor
overload has
tripped. The
contact is open.
WARNING:
Only qualified electri-
cal service personnel
should examine and
correct problems that
require opening the
unit's electrical
enclosure or checking
electrical current to
diagnose the cause of
a problem.
The actual tempera-
ture of water
supplied to the
process is 100° F, or
has exceeded 75° F
for more than 30
minutes.
Possible cause
Is the correct voltage
supplied to the pump
motor?
Is the required water flow
greater than the pump’s
capacity?
Is the motor overload
faulty or set incorrectly?
Is the pump working
properly?
Is the refrigerant charge
low?
Is the unloader valve
stuck open?
Did the compressor fail?
Solution
Supply voltage should match
the rating on the pump name
plate. If voltage is correct,
check wiring connections.
❒
Review pump sizing
for the application.
❒
Decrease the water flow
from the process.
Disconnect the power and open
the electrical enclosure. Verify
that the overload is set to trip at
the proper amperage, which
should not exceed the FLA.
Manually trip and reset the
overload. If the problem contin-
ues, replace the overload. See
R
ESETTING AND
R
EPLACING
O
VERLOADS
.
Replace the pump if supply
voltage, wiring and overload
settings are correct, but the
pump continues to draw exces-
sive current.
See
C
HECKING
R
EFRIGERANT
C
HARGE
. If the charge is low,
contact a certified refrigeration
technician to recharge.
See
C
HECKING THE
U
NLOADER
V
ALVE
.
If the valve is stuck open,
contact a certified refrigeration
technician to repair.
Check compressor electrical
connections. Replace the com-
pressor, if it has failed.
The chiller has detected a problem that could lead to equipment
damage or personal injury if it is not corrected.
◆ The Alarm LED lights and the STOP/RUN LED flashes red.
◆ The chiller automatically shuts down.
◆ The control displays a red LED or alarm code indicating the
source of the problem.
Pump
SAFHi