Isotemp
Refrigerators and Refrigerator-Freezers
Installation | 3
How to Seal Killark
™
Box Conduit with Fiber and
Sealing Compound to Help Protect Against Explosions
(Explosion-Proof Units Only):
The purpose of the procedure that follows is to build fiber
rope dams on the left and right hubs of the horizontal conduit.
The fiber rope damns will surround conduit wiring that is
housed inside the horizontal conduit.
When both the left and right fiber rope dams have been
pressed into place, sealing compound is poured between the
two and forms into an airtight plug.
All of this is done in order to prevent the very real threat of gas
entering the Killark box and a resulting serious explosion. After
the unit wires have been pulled through the horizontal conduit
the following procedure is required:
•
Turn power off at the circuit breaker before
proceeding.
•
Place a small amount of sealing compound granules,
enclosed, into a clean mixing vessel. Add small
amounts of water while stirring until a thick paste is
formed, then carefully continue adding smaller
amounts of water until a thick gravy consistency is
achieved—NOT WATERY. Discard any material that
becomes too stiff to use. Never attempt to restore
workability by stirring in more water.
•
Locate silver Killark box, back/top-center of unit.
•
Unscrew conduit domed-cover.
Figure 1. Sealing the Killark Box
Figure 2. Horizontal Conduit, Cutaway
•
Insert fiber rope material down into horizontal conduit
opening. Pressing down firmly, work the material into the
left hub and—most importantly—being sure the material
COMPLETELY SURROUNDS THE WIRING, from the top
to the bottom, completely blocking this end of the
horizontal conduit.
•
Insert fiber rope material down into horizontal conduit
opening. Pressing down firmly, work the material into the
right hub and—most importantly—being sure the
material COMPLETELY SURROUNDS THE WIRING, from
the top to the bottom, completely blocking this end of the
horizontal conduit.
•
Pour sealing compound down in between the two fiber
rope dams filling the remaining space. Pour slowly, being
careful not to trap air bubbles. Immediately wipe off any
spilled sealing compound.
•
Screw conduit domed-cover back onto conduit opening.
Note:
INITIAL SETUP OF SEALING COMPOUND WILL
OCCUR IN APPROXIMATELY 30 MINUTES HOWEVER, THE
SEALING COMPOUND REQUIRES A
MINIMUM OF 8
HOURS ABOVE 32ºF
TO DEVELOP SUFFICIENT
STRENGTH TO WITHSTAND EXPLOSIONS.
