User's Manual

2-34 Chapter 2: Installing the Hardware Infrastructure
• To use permagum, roll a walnut-sized piece into a rope shape
and push as much as possible into both ends of the cable entry
hole. Permagum-type sealing compound looks like modeling
clay and is commonly available from HVAC and electrical
supply houses. One example is Virginia KMP brand sealing
gum, catalog number PP-22V, from
www.virginiakmp.com.
• If replacing an antenna or cable, re-seal the cable entry hole.
New permagum is best, but existing permagum can be re-used,
if necessary.
• DO NOT use any type of expanding foam sealant, for example
Dow brand "GREAT STUFF" polyurethane foam or DAP brand
DAPtex latex foam. NCR has found that these materials do not
cure properly at freezer temperatures or in the presence of
water condensation.
Note: If the customer stacks merchandise on top of the freezers,
protect exposed RX antenna cables with metal conduit. Customers
sometimes showcase large items on top of freezer units. These items
will damage exposed RX antenna cables. Protect cables with short
lengths of metal or plastic electrical conduit. Use appropriate straps to
keep the conduit in place.
Special Instructions for Sealing Inline BNC Antenna Connectors That
Must Be Located Inside Freezers
This BNC sealing procedure is only recommended for the following
situations:
• If servicing a walk-in or oversized freezer that was installed before
the previous guidelines were available
• If installing RealPrice infrastructure at a new site and long-lead RX
antenna kit 7730-K055-V002 cannot be obtained in time to meet the
installation schedule