How To Seal Killark ® Box Conduit - VWR VWH07CESA Installation And Operation Manual

CAUTION: Solutions used to clean coils or
neutralize bacteria growth must not be corrosive
to metals (enamel-coated steel) and materials
used in the maintenance of this equipment—
damage can result: use a soft cloth and warm
water to clean
How to Seal Killark
Conduit
To Seal Killark® Box Conduit with Fiber and Sealing
Compound to Help Protect Against Explosions (Explosion-
Proof Refrigerators and Freezers 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.
®
Note: KILLARK is a registered trademark of Hub bell
Incorporated, Shelton, CT, USA.
Figure 1. Sealing the Killark Box
Explosion-Proof and Flammable Materials Storage Laboratory Refrigerators and Freezers
Note: Wires must be kept separated as shown in the
Figure 2
®
Box
Figure 2. Horizontal Conduit, Cutaway
•
Figure 3. Fiber rope material in left hub
•
Figure 4. Fiber rope material in right hub
•
Left Hub
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
Wiring
Right Hub
Installation | 11