Watlow Thermostat Control - Manual (Page 4)

WATLOW IND.
Thermostat Control Installation & Maintenance Manual
I&M NUMBER 316-42-4-1 Page:4
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
Before applying power through the thermostat the following items should have been checked with the
heater power disconnected:
1. Immersed section of heater is completely covered by liquid if applicable
2. Electrical termination is tight and wiring is per wiring diagram supplied with thermostat or heater
3. Proper disconnecting means and fusing have been installed
4. The voltage rating of the thermostat or heater is the same as that being applied
6. Safety limiting devices are in place
After applying power to the system make sure that it is being controlled properly before leaving it to run
unattended. Failure to do this could result in overheating resulting in personnel danger and fire.
Troubleshooting
PROBLEM CAUSE / CORRECTION
The load will not turn ON Check fuses, circuit breakers, load, and wiring.
See wiring diagrams in Figure #1 or that sent with the Watlow heater
A faulty unit, contact the factory
The load will not turn OFF Check for kinks in the capillary
A faulty unit, contact the factory
The unit is not controlling to set point Check to make sure bulb is properly located in application
Unit may be out of calibration, contact factory
Preventative Maintenance
!
CAUTION: HAZARD OF ELECTRIC SHOCK. TURN ALL POWER TO SYSTEM OFF, USE
APPROPRIATE DISCONNECT LOCKOUTS AND ALLOW SYSTEM/HEATER TO COOL BEFORE
PERFORMING ANY MAINTENANCE
Check line connections to make sure they are tight, free of oxide build-up, and that no dust or dirt build-up is
present.
Check enclosure (inside) if provided for rust, dirt or dust. Remove rust if present, with steel wool (or equal)
and thoroughly blow clean with dry, oil-free air.
If enclosure is moisture resistant, check condition of cover gasket. A replacement can be obtained from the
factory.
Replacement Parts
Reference the thermostat part number on the nameplate when ordering replacement parts.
Recommended spare parts would be : a thermostat.
Contact your local Watlow distributor for ordering replacement parts. Check the Yellow Pages under
"Electrical Heating Elements" in the largest industrial area nearest you.