Preparing The Mounting Surface - Retrofit / Offset Mounting - Raymarine ALPHA Installation Instructions Manual

• A — Cutout (when flush mounting the cutout will be the same size as for
surface mounting).
• B — Flush mounting requires an extra rebate to recess the display fully in
the mounting surface.
Important:
When flush mounting, the fixings go through holes drilled in the rebated,
and therefore thinnest, part of the mounting surface. Before preparing the
mounting surface, ensure that sufficient surface thickness will remain
(once rebated) to take the weight of the display. The final rebated area
must be at least as thick as the display's bezel (7.00 mm (0.28 in)), in order
to ensure that the display sits entirely flush with the mounting surface. Due
to these requirements, not all mounting surface types and materials are
suitable for flush mounting the display. It is the installer's responsibility to
ensure that the mounting surface is suitable for flush mounting. If the
mounting surface is not suitable, the display must be surface or trunnion
mounted instead.
1. Mark the cutout line identified on the supplied mounting template on
the mounting surface.
2. Mark the rebate for flush mount line identified on the supplied mounting
template on the mounting surface.
Mounting
3. Use a drill and an appropriate size drill bit or hole cutter to cut out the
corners of the cutout line. The corner diameter for the instruments is
8.00 mm (0.31 in).
4. Use a jigsaw or similar cutting tool to cut out the remainder of the cutout
area.
5. Use a router hand tool to recess the marked rebate area to a depth of
7.00 mm (0.28 in).
6. Carefully (and temporarily) fit the display to the cutout area, to check for a
good fit. Do not use any fixings at this time. If the fit is very tight, it may
be necessary to remove the display and file the edges of the cutout to
achieve a better fit, using a half round file and/or sandpaper. Alternatively,
if the fit is loose and there is a visible gap between the display's outer
bezel and the cutout, this will need to be filled with marine-grade sealant
or suitable packing material to fill the gap. This should only be done
once the display has been secured to the surface using the fixings, as
described in the next mounting procedure.
7. Use a half round file and/or sandpaper to smooth and rough edges or
burs on the cut out hole.
8.7 Preparing the mounting surface — retrofit
/ offset mounting
Offset mounting requires one cutout hole. When the performance display
is offset mounted the glass/bezel and case will protrude from the mounting
surface.
Note:
The following procedure is for preparing the mounting surface for surface
mount installations. For flush or instrument mounting details, refer to:
• p.32 — Preparing the mounting surface — surface mounting
• p.32 — Preparing the mounting surface — flush mounting
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