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Thermolator TW-1 and TW-2 UGH015/0100
6-8 TROUBLESHOOTING
WARNING
A
LARMS
Alarm
The Thermolator
will not heat to the
setpoint temperature,
or takes too long to
reach the setpoint
temperature. The
actual temperature of
fluid supplied to the
process is lower than
the setpoint devia-
tion allows.
WARNING:
The Thermolator should
be tested and repaired
only by qualified techni-
cians equipped with the
correct tools and trained
in the maintenance and
repair of electrical sys-
tems and industrial
appliances.
Possible cause
Is the cooling valve stuck
open or leaking water?
Did a heater element fail?
Did a heater contactor
fail?
Is the low deviation tem-
perature set too low?
Is the Thermolator cor-
rectly sized for the appli-
cation?
Solution
Disassemble the cooling valve
and check for particles block-
ing the valve seat. Check the
valve seat for excessive wear.
Replace as required using a
valve repair kit. See Repairing
Solenoid Valves.
With the unit powered down:
Check for loose connections.
Check resistance between the
phase legs on the output side
of the heater contactor.
Readings should be within
0.25 ohms of each other.
Replace the heater, if neces-
sary. See Replacing Heater
Elements.
With power on and the
Heater LED lit: Check the
amp draw on each of the three
phase legs to the heater. All
should match the FLA listed
for the heater on the unit
nameplate. Replace the heater
contactor if there is a voltage
imbalance greater than 10%.
See Replacing the Heater
Contactor.
Increase the low deviation set-
ting. The recommended setting
is 2° F to 10° F below the
process setpoint.
Review specifications and
selection guidelines that apply
to heater and pump sizes in
temperature control units.
Low Deviation
The Thermolator has detected a problem that could lead to a shut
down condition if it is not corrected.
The Alarm LED lights.
The Thermolator continues operating.
The control displays a red LED or alarm code indicating the
source of the problem.
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