Flowline LC8X Thermo-Flo - Manual (Page 3)

Step Two Step Three
SAFETY PRECAUTIONS INTRODUCTION
About This Manual:
PLEASE READ THE ENTIRE MANUAL PRIOR TO
INSTALLING OR USING THIS PRODUCT. This manual
includes information on two different models of Remote Relay
Controllers for Flow applications from Flowline: LC80-1001 and
LC82-1001. Many aspects of installation and use are similar
between the two models.
User’s Responsibility for Safety:
Flowline manufactures several models of controller, with different
mounting and switching configurations. It is the user’s responsibil-
ity to select a controller model that is appropriate for the applica-
tion, install it properly, perform tests of the installed system, and
maintain all components.
Electrical Shock Hazard:
It is possible to contact components on the controller that carry
high voltage, causing serious injury or death. All power to the con-
troller and the relay circuit(s) it controls should be turned OFF prior
to working on the controller. If it is necessary to make adjustments
during powered operation, use extreme caution and use only insu-
lated tools. Making adjustments to powered controllers is not rec-
ommended. Wiring should be preformed by qualified personnel in
accordance with all applicable national, state and local electrical
codes.
Flammable or Explosive Applications:
LC80 series remote mount controllers should not be used with
explosive or flammable liquids, which require an intrinsically
safe rating such as the Flowline LC90 series. If you are unsure of
the suitability of a controller for your installation, consult your
Flowline representative for further information.
Install In a Dry Location:
The controller housing is not designed to be immersed. It should
me mounted in such a way that it does not come into contact with
liquid. Its case is made out of PP (polypropylene). Refer to an
industry reference to ensure that compounds that may splash onto
the controller housing will not damage it. Such damage is not cov-
ered by the warranty.
Relay Contact Rating:
The relay is rated for a 10 amp resistive load. Many loads (such as
a motor during start-up or incandescent lights) are reactive and
have an inrush current characteristic that may be 10 to 20 times
their steady-state load rating. The use of a contact protection circuit
may be necessary for your installation if the 10 amp rating does not
provide an ample margin for such inrush currents.
Make a Fail-Safe System:
Design a fail-safe system that accommodates the possibility of relay
or power failure. If power is cut off to the controller, it will de-ener-
gize the relay. Make sure that the de-energized state of the relay is the
safe state in your process. For example, if controller power is lost, a
pump will turn off if it is connected to the Normally Open side of the
relay.
While the internal relay is reliable, over the course of time relay fail-
ure is possible in two modes: under a heavy load the contacts may be
“welded” or stuck into the energized position, or corrosion may build
up on a contact so that it will not complete the circuit when it should.
In critical applications, redundant backup systems and alarms must be
used in addition to the primary system. Such backup systems should
use different sensor technologies where possible.
While this manual offers some examples and suggestions to help
explain the operation of Flowline products, such examples are for
information only and are not intended as a complete guide to
installing any specific system.