Specifications

UGH015/0100 Thermolator TW-1 and TW-2
TROUBLESHOOTING 6-17
The Thermolator uses two type ‘K’ thermocouples
to monitor supply and return process temperatures. One ther-
mocouple is installed in the wall of the heater tank at the “to
process” outlet. The other thermocouple is installed in the wall
of the cooling tank at the “from process” inlet.
To check a thermocouple after a probe error:
Disconnect and lockout the main power.
Open the electrical enclosure door.
Turn the screw
on the front panel counterclockwise to open.
Unplug the appropriate thermocouple from the
motherboard and install a jumper on the leads.
Refer to the wiring diagrams that came with your unit.
Restart the Thermolator.
◆ If error message disappears, replace the thermocouple.
◆ If error message does not disappear, replace the mother-
board. See Replacing the Motherboard.
To replace a thermocouple:
Disconnect and lockout the main power.
Shut off the cooling water infeed and drain the
unit.
Drain all water using the drain plugs located the
bottom of the unit.
Remove the unit’s top panel
and open the electrical enclo-
sure
Remove the thermocouple.
Loosen the compression nut to slide
the thermocouple out of the casing.
Disconnect the thermocouple wires
at the motherboard.
Install the new thermocouple.
Insert the tip of the new thermocou-
ple at least 1 inch into the tank.
tighten the compression nut. Thread
the leads through the raceway lead-
ing to the electrical enclosure. Attach
the thermocouple leads to the moth-
erboard.
1
2
3
4
CHECKING
THERMOCOUPLES
1
2
3
4
5
REPLACING
THERMOCOUPLES
Thermocouple
Nut
WARNING:
Hot surfaces
Allow the Thermolator
to cool to below 100° F
(38° C) before servicing
the unit.