Specifications

UGH015/0100 Thermolator TW-1 and TW-2
TROUBLESHOOTING 6-13
CHECKING AND
REPLACING
FUSES
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.
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 Disabling or Enabling Output
Monitors in the
MAINTENANCE section.
1
2
3
4
1 23
45
6
78
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/ 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
Fuse 1
Control
power
Fuse 5
Vent valve
Fuse 4
Cooling valve
Fuse 2
Pump
Fuse 3
Heater
Fuse 6
Purge valve
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.