Control Warning Alarms - Conair Thermolator TW-1 User Manual

TW-1, TW-2
C
ONTROL
W
ARNING
A
LARMS
Alarm
Low 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 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.
6-14
T
ROUBLESHOOTING
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.
Possible cause
The cooling valve is stuck
open or leaking water.
A heater element fail.
A heater contactor failed.
The low deviation tem-
perature is set too low.
The Thermolator is incor-
rectly sized for the appli-
cation.
Thermolator TW Series
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
phases on the output side of
the heater contactor. Readings
should be within 0.25 ohms of
each other. Replace the heater,
if necessary. See Replacing
Heater Elements, Section 6.
With power on and the
Heater LED lit: Check the
amp draw on each of the three
phases 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 low deviation set-
ting. The recommended setting
is 2°F to 10°F.
Review specifications and
selection guidelines that apply
to heater and pump sizes in
temperature control units.
UGH025-0504