CHECKING AND
REPLACING
FUSES
UGH025-0504 Thermolator TW Series
TROUBLESHOOTING 6-19
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 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 fuse continues to fail:
r Verify that the unit is receiving the correct voltage.
Check the voltage, phasing and amperage ratings on the
unit’s nameplate.
r Verify that the unit’s transformer is operating correctly.
Check for proper voltage (120V ±10%) to the voltage
sensing device for the fuse location.
r 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 Disabling or Enabling Output Monitors,
Section 5.
1
2
3
4
Fuse 1
Control
power
Fuse 5
Vent valve
Fuse 4
Cooling valve
Fuse 2
Pump
Fuse 3
Heater
Fuse 6
Purge valve
IMPORTANT: Always
refer to the wiring dia-
grams that came with
your Thermolator to
locate specific electrical
components. Illustrations
in the User Guide are
intended to be represen-
tative only.
WARNING:
Shock Hazard
Only qualified service per-
sonnel familiar with electri-
cal testing and industrial
equipment should examine
and correct problems that
require opening the unit
with power on to diagnose
the cause of a problem.
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