Conair Thermolator TW-1 User Manual page 74

TW C
ONTROL
A
LARMS
Alarm
High Setpoint Deviation
The Thermolator
will not cool down,
or takes too long to
cool down. The actu-
al temperature of
fluid supplied to the
process is higher
than the setpoint
deviation 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.
6-6
T
ROUBLESHOOTING
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.
Possible cause
Water has stopped flow-
ing between supply outlet
and return inlet.
The cooling valve fail to
close.
The temperature differ-
ence between the cooling
water supply and the set-
point is too small.
A heater contactor failed
to close.
The cooling valve under-
sized for the application.
The deviation tempera-
ture band is too narrow.
Thermolator TW Series
Solution
Check for a plugged pipe or
closed valve.
Check the cooling valve. See
Repairing Solenoid Valves or
Motorized Cooling Valves,
Section 6.
The temperature difference
should be at least 25°F to
achieve proper cooling. Increase
the process setpoint, decrease
the cooling water supply tem-
perature or increase the cooling
water supply pressure.
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.
Check the cooling load (Btu/hr)
for which the valve was speci-
fied.
Increase the deviation band. The
recommended setting is the set-
point plus/minus 2°F to 10°F .
UGH025-0504