WATLOW ELECTRIC MANUFACTURING COMPANY
Installation & Maintenance Manual for MULTICELL
TM
Heaters
I&M MANUAL No: 316-42-21-1
Page: 13
Date: 3/15/2017
Rev: 5.00
WATLOW ELECTRIC MANUFACTURING COMPANY - 6 INDUSTRIAL LOOP RD.
– HANNIBAL, MO 63401 - PHONE 573-221-2816
Original Instructions (English)
Consult the wiring diagram, if supplied with the heater, for the correct feeder wires connections. If
one was not supplied with the heater, the system designer or the factory should be consulted for
the appropriate wiring diagram.
Feeder wire line connections may be made directly to the various termination options, which may
include: leadwires, ring connector, spade connector, female Faston, male Faston, Twist-Lock
®
Plug, or a plug and socket connector as shown in the Watlow Catalog. For units with an
enclosure, a protective earth / ground connection terminal is also supplied inside the enclosure
for a ground wire.
This terminal is painted “green” for easy identification within the electrical
enclosure.
WARNING
It is the U
ser’s responsibility to properly size and install the feeder wires for the
heater. 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 electrical enclosure.
For heaters that do not already have insulated supply leads provided, the User
must take action to cover any exposed conductive surfaces by adding suitable
insulating material such as sleeving, heat shrink sleeve insulation, ceramic beads,
etc
It is essential that these connections be tight. The top nut of the element stud
terminals should be tightened to a maximum torque of 2.3 N·m (20 in-lbs) while
the bottom nut is supported. NOTE: The top nut of stud terminals that do not have
a buss bar or factory installed ring connector should only be tightened to 1 N·m (9
in-lbs).
It is the U
ser’s responsibility to ensure that the adjacent edge radii and bending
radius of conductors/cables are large enough at the point of entry to prevent any
damage and that connection of conductors, including their covering, shall be
possible without risk of damage.
WARNING
– Risk of Electric Shock
It is the U
ser’s responsibility to properly size the ground wire for the Protective Earth /
Safe Ground and to assure that the impedance of this is low enough to assure a
person’s safety.
