Conair Thermolator TW-1 User Manual page 81

The Thermolator has detected a problem that could lead to a shut
down condition if it is not corrected.
u The Alarm LED lights.
u The Thermolator continues operating.
u The control displays a red LED or alarm code indicating the
source of the problem.
Alarm
High 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.
UGH025-0504
Possible cause
Water stopped flowing
between the supply and
return.
The cooling valve failed.
The temperature differ-
ence between the cooling
water supply and the set-
point is too small.
A heater contactor failed.
The cooling valve is the
wrong size.
The high deviation tem-
perature is set too low.
Thermolator TW Series
TW-1, TW-2
C
W
A
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 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.
Check the cooling load (Btu/hr)
for which the valve was speci-
fied.
Increase the high deviation set-
point. The recommended setting
is 2°F to 10°F .
T
ROUBLESHOOTING
ONTROL
ARNING
LARMS
6-13