Chromalox LIMIT Installation And Operating Instructions Manual

Installation and

Operating Instructions

LIMIT

Temperature Controller

PK523-2

0037-75551

September 2018

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LIMIT Temperature Control

The LIMIT protects expensive heaters and sensitive
materials from damaging over temperature conditions.
It is designed for industrial and commercial applications
that require high temperature protection.

The LIMIT features a Form C latching, manually resetta­ble relay output that de-energizes whenever the sensed
temperature exceeds the set point temperature.

The DIN Rail mounting feature allows quick installation
without drilling or extra hardware. Slots are also pro­vided for direct panel mounting.

Two methods are provided to reset an alarm condition.
(1) The Limit alarm has a reset pushbutton on the unit
and (2) reset terminals are provided for resetting the
alarm from a remote pushbutton.

Mounting

ELECTRIC SHOCK HAZARD. Read and understand
all instructions before installing, servicing or oper­ating LIMIT controller. Failure to do so could result
in personal injury or property damage.

The Heating system designer is responsible for the
safety of the equipment and must determine the
suitability of this temperature LIMIT controller with
other electric heating equipment. Where the conse
quences of failure could result in personal injury or
property damage, back-up controls are essential.

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The LIMIT can be surface mounted or DIN rail mount­ed. It can be mounted to any suitable flat surface using
two #6 screws (not supplied). To install simply position
the top set of rear clips over the top of the DIN rail.
Then swing the bottom of the controller toward the rail
applying pressure until the lower clips snap on to the
bottom of the DIN rail. To remove apply pressure to the
top of the controller’s base and move the bottom of the
controller toward you. Then lift the top of the controller
off the upper DIN rail. The housing rating is NEMA 1.

This controller must be mounted in an enclosure
suitable for protection against normally expected
operation environments and to minimize unauthor­ized tampering with the limit settings.

FIRE/EXPOSION HAZARD. This heater is not intend­ed for use in hazardous atmospheres where flam­mable vapors, gases, liquids or other combustible
atmospheres are present as defined in the National
Electrical Code. Failure to comply can result in per­sonal injury or property damage.

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