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UGH004/0999 microKool Portable Chillers
TROUBLESHOOTING 6-13
CHECKING AND
REPLACING
FUSES
IMPORTANT:
Always
refer to the wiring dia-
grams that came with
your chiller to locate spe-
cific electrical compo-
nents. Illustrations in the
User Guide are intended
to be representative only.
This procedure covers the factory-installed fuses on the unit’s
motherboard. If you have installed an electrical disconnect or
emergency stop switch, additional fuses and/or breakers may
have been used elsewhere in the in the main power circuit.
To replace a blown fuse:
Disconnect and lockout the main power.
Open the electrical enclosure door.
Turn the screw
on the front panel counterclockwise to open.
Replace the fuse. The fuses are located on the mother-
board and are labeled and identified on the orange shield.
Close the electrical enclosure and restart the unit.
If fuses continue to fail:
❒ Verify that the unit is receiving the correct voltage.
Check the voltage, phasing and amperage ratings on
the unit’s nameplate.
❒ Verify that the unit’s transformer is operating correctly.
Check for proper voltage (120V 10%) to the voltage
sensing device for the fuse location.
❒ Check all wiring referencing the fusing location for
loose connections, damage or improper grounding.
Verify that the correct device is being used for this fuse
location. See
D
ISABLING OR
E
NABLING
O
UTPUT
M
ONITORS
in the
M
AINTENANCE
section.
1
2
3
4
CONFIGURATION
DIP SWITCH
OFF
ON
4
3
2
1
4
3
2
1
UNLDR 1/ VENT 2 SOL +
UNLDR 1/ VENT 2 SOL
UNLDR 2/ COOL 1 SOL +
UNLDR 2/ COOL 1 SOL
F5
F4
F2
PUMP
PUMP
PUMP OL
PUMP OL
6
5
4
3
2
1
4
3
2
1
6
5
4
3
2
1
F3
4
3
2
1
F6
PMP AUX
PMP AUX
1FS/ PURGE/ COMP AUX
1FS/ COMP AUX
PUMPDOWN
PUMPDOWN
HEAT/COMP
HEAT/COMP
HTS/COMP OL
HTS/COMP OL
N
C
NC
NO
C
110V
ALARM
LLS/PURGE 3SOL
LLS/PURGE 3SOL +
PURGE 4SOL
PURGE 4 SOL +
3 PHASE INPUT
TCPL'S
SUP RET
AC IN 4
AC IN + 3
AC OUT 2
AC OUT + 1
F1
LLS/WPS
LLS/WPS
AUTOSTART
AUTOSTART
HPS/LPS
HPS/LPS
OPS
OPS
FSTAT
FSTAT
L1
L2
L3
6
5
4
3
2
1
4
3
2
1
Y
R
R
Y
1 2 3 4 5 6 7 8 1 2 3 4
(-2) CONTROL
OPER PNL CABLE
+ 120 Ohm
+ TR
TR
GND
GND
+ TR
TR
120 Ohm
12
3
4
5
6
7
8
Fuse 1
Control
power
Fuse 5
Unloader valve 1
Fuse 4
Unloader valve 2
Fuse 2
Pump
Fuse 3
Compressor
Fuse 6
Level switch
WARNING:
Shock Hazard
Only qualified service
personnel familiar with
electrical testing and
industrial equipment
should examine and
correct problems that
require opening the
unit with power on to
diagnose the cause of
a problem.