Specifications

WATLOW IND. WATROD Duct Heater Installation & Maintenance Manual
I&M NUMBER: 316-42-6-1 Page: 4
Date:6/11/2008 Rev: 3.00
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WATLOW IND.n # 6 INDUSTRIAL LOOP RD. n HANNIBAL MO, 63401n PHONE [phone] n FAX [phone]
process temperature. This will help to lower the terminal enclosure temperature and save energy. See
Figure 2 for an example of how tadpole gaskets will seal off the terminal from being exposed to process
temperatures.
This surface of the insulation retainer should
be flush with the inside of the mating duct.
Projecting this surface beyond the inside duct
surfac will increse the pressure drop.
This surface of the tadpole gasket should
“seat out” on the insulation retainer surface
that is flush with the inside wall of the
ductwork
Figure # 2
Using Tadpole Gaskets to Seal off the Air Flow.
7. Lifting / Installing
Duct heaters can be lifted in the horizontal or vertical position as long as straps are used that are
suitable for the size and the weight of the heater. For horizontal lifting we recommend using two straps,
one supporting the bundle using the element supports and the other the terminal enclosure. The strap
for the element bundle should not be looped through the elements, only the support rods. This protects
the elements from possible damage from lifting. The second strap shoud support the terminal housing.
See Figure # 3 below for locations for straps.
Once the heater has been lifted and is being installed into the ductwork the strap in the bundle should be
removed only after the bundle has been placed inside of the ductwork. The strap on the housing should
be removed just prior to the heater being securely mounted into place.
For verical lifting a strap can be attached vertically around the terminal enclosure and the insulation
retainer. In order to do this the strap can be slipped through the space between the element bundle and
the insulation retainer. Avoid putting the strap through the elements to prevent possible damage from
lifting. See Figure #4 below for examples.