Conair Thermolator TW-1 User Manual page 75

The Thermolator has detected a problem that could lead to equip-
ment damage or personal injury if it is not corrected.
u The controller displays a red alarm LED or an error code indi-
cating the cause of the problem.
u If the optional alarm package is installed, the Fault button will
illuminate and the audible alarm will activate.
Alarm
Low Setpoint Deviation
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 band allows.
WARNING:
The Thermolator
should be tested
and repaired only by
qualified technicians
equipped with the cor-
rect tools and trained in
the maintenance and
repair of electrical sys-
tems and industrial
appliances.
UGH025-0504
Possible cause
The cooling valve is stuck
open or leaking water.
A heater element failed.
A heater contactor failed
to open.
The deviation tempera-
ture band is too narrow.
The Thermolator is
under-sized for the
application.
Thermolator TW Series
TW C
A
LARMS
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, Section 6.
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, Section 6.
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, Section 6.
Increase the deviation band
setting. The recommended set-
ting is the setpoint plus/minus
2°F to 10°F.
Review specifications and
selection guidelines that apply
to heater and pump sizes in
temperature control units.
T
ROUBLESHOOTING
ONTROL
6-7