Watlow WATROD Over-the-Side - Manual (Page 3)

WATLOW IND.
WATROD Over-the-Side Installation & Maintenance Manual
I&M NUMBER: 316-42-9-1 Page: 3
Date: 6/11/2008 Rev: 2.00
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WATLOW IND.n # 6 INDUSTRIAL LOOP RD. n HANNIBAL MO, 63401n PHONE 573-221-2816 n FAX 573-221-3723
SLUDGE
LIQUID LEVEL
2" MIN
Figure # 1
DANGER: HAZARD OF FIRE. Electric heaters are capable of developing high temperatures so extreme
care should be taken to locate heaters in safe environments. Mounting heaters in atmospheres
containing combustible gases and vapors should be avoided. According to article 501 of the NEC, the
maximum surface temperature of the heater shall not exceed 80 % of the auto-ignition of the surrounding
atmosphere when the heater is continuously energized. Care should also be taken to keep combustible
materials far enough away to be free of the effects of high temperatures.
5. Wiring
WARNING; HAZARD OF ELECTRIC SHOCK. Any installation involving electric heaters must be
grounded to earth to eliminate shock hazard.
Electrical wiring to the heaters must be installed in accordance with the National Electric Code and any
state and local electrical code by qualified personnel.
Consult wiring diagram supplied with the unit for correct feeder wires connections. If one is not supplied,
the factory should be consulted for the appropriate wiring diagram. Feeder wire should be properly
selected based on amperage, electrical power rating, ambient temperature, and type of environment.
Feeder wire should also be housed in either rigid or flexible conduit which carries the same classification
as the heater enclosure. It is the users responsibility to properly size and install feeder wire.
Feeder wire line connections are to be made directly to stud terminals for Vertical Loop heaters and
Drum Heaters. Use a #10 ring terminal (T&B, Amp, etc.) for making these connections. It is essential
that these connections be tight. The bottom nut should be supported while applying a maximum torque
of 20 in-lbs to the top nut. Ground connection (color coded "green") is supplied inside the housing for
ground wire.
For "L" and "O" shaped Over-the-side heaters, feeder wires should be connected to the terminal block
provided. The terminal block will accept a #8 through #18 AWG wire.
Line voltage must be equal to or less than rating stamped on the heater assembly.
Thermostats can be supplied with over-the-side heaters. Consult the wiring diagram supplied with the
heater for the suggested wiring of thermostats. For safe operation of thermostats, consult Installation and
Maintenance manual for thermostats that is attached.