Thermolec Application &Technical Notes - Manual (Page 3)

THERMOLEC FEATURES
FEATURES
MERCURY CONTACTORS
Used to power individual stages of
heating. They allow a silent operation
and are exceptionally reliable. AUTOMATIC RESET CUT-OUT
The automatic reset thermal cut-out is
a fail-safe, fixed temperature, disc type
safety device that opens the circuit when
it’s set point is reached. It automatically
resets and returns the heater to operating
conditions.
AIRFLOW SWITCH
Used to prevent a heater
from operating if there is
no airflow. Provided with a
pitot tube which, when
installed into the duct,
makes it sensitive to
velocity pressure as
well as to static
pressure.
TRANSFORMER
Built-in control
transformer supplies
24 volts to the control circuit.
FUSES
Used to protect the
total load or individual
stages.
SCR CONTROLLER
The SCR is a time proportioning type controller that
modulates the heater and supplies the exact amount of
power to match the heat demand. It is compatible with
thermistor thermostat (RT or DT), 0-10 Vdc, 4-20 mA,
0-135 ohms input signals.
SOLID STATE RELAY
Electronic contactor used to silently
and proportionally control the heater in
response to a pulsed signal.
MAGNETIC CONTACTORS
Used to power individual
stages of heating or as back-up
for safety switches.
DISCONNECT SWITCH
A built-in disconnect
switch allows user to
disconnect heaters
individually in order
to safely perform
maintenance tasks.
HIGHEST GRADE
OPEN COIL
TUBULAR INCOLOY
ELEMENT
The NR TL/C indicator adjacent to the CSA Mark
signifies that the product has been evaluated to the
applicable ANSI/UL and CSA Standards, for use in the
U.S. and Canada. NRTL, i.e. Nationally Recognized
Testing Laboratory, is a designation granted by the
U.S. Occupational Safety and Health Administration
(OSHA) to laboratories which have been recognized to
perform certification to U.S. Standards.
Standard l Optional r
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All Thermolec Heaters are CSA and NRTL/C approved.