Watlow Thermostat Control - Manual

WATLOW IND.
Thermostat Control Installation & Maintenance Manual
I&M NUMBER 316-42-4-1 Page:1
Date: 6/11/2008 Rev:4.00
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WATLOW IND.n # 6 INDUSTRIAL LOOP RD. n HANNIBAL MO, 63401n PHONE 573-221-2816 n FAX 573-221-3723
Pre Installation
• Check to make sure that the thermostat received is the same as that ordered.
• Check capillary for kinks and damage to the bulb
Safety
Fire and electrical shock may result if thermostats are used improperly or are installed by unqualified
personnel !! Care should be taken to read and completely understand the Installation and Maintenance
manual before installing and wiring the thermostat. Any installation and maintenance performed on the
thermostat shall be done by a qualified electrician, in accordance with the "National Electric Code" and other
electrical codes as they apply. It is the users responsibility to ensure that the thermostat being used is
properly selected and installed in the application.
!
The Caution Symbol (exclamation point) alerts you to a "CAUTION", a safety or
functional hazard which could affect your equipment or its performance.
The warning symbol (lightning bolt) alerts you to a "WARNING", a safety hazard which
could affect you and the equipment
Installation
Proper thermostat selection and installation will result in safe operation, and acceptable heater control.
1. Locate the thermostat in an area where ambient temperatures do not exceed 150
°F (66°C)
2
. If thermostat is not already enclosed in an electrical housing, then enclose the thermostat to:
• prevent electrical shock to personnel through accidental contact
• if applicable, prevent fire or explosion when flammable gases or vapors, flammable liquids, combustible
dust, or ignitable fibers or flyings are present in accordance with articles 500 through 504 of the
"National Electric Code" (NEC)
• prevent contact with falling objects that might damage or cause electrical short
3. Locate sensing bulb in the process fluid so that the entire bulb is exposed to the heated media, but a
sufficient distance from the heating element to negate the influence of the sheath temperature. Care
should be taken not to kink the capillary tubing of the thermostat while installing the thermostat.
It is not recommended that the thermostat be attached to the heater sheath for high limit protection.
WARNING: Install high temperature control protection in systems where an over temperature
fault condition could present a fire hazard or other hazard. Failure to install temperature control
protection where a potential hazard exists could result in damage to equipment and property,
and injury to personnel.
Failure of components in a temperature control loop, such as the thermostat, and heater control relay
can result in damage to a product in process, a melt down of a heater, and / or damaging fire.
To protect against this possibility, over temperature protection must be provided to interrupt or remove
power from the heater circuit. A bulb and capillary thermostat is not recommended for this function
since it may not respond quickly enough to adequately protect the heater. In cases where the
thermostat bulb gets too hot before the system is turned off, the thermostat bulb could rupture.
This could result in the thermostat remaining in the "ON" condition since there is insufficient
fluid to move contacts apart. We recommend the temperature protection have appropriate third party