IM 915-13 • VISION - EXTENDED SIZES 18 www.DaikinApplied.com
Follow these guidelines when routing eld supplied internal
piping through the bottom of a unit.
• Determine what style base and options were selected:
— Was an uninsulated sheet metal pipe chase cover
selected?
• Determine the number and location of holes required for
piping as follows:
— Check that adequate space is available inside the unit
for pipe routing.
— Hole(s) must be located fully within panels or sheet
metal opening covers. Do not run pipes through 4”
wide intermediate panels or on the very edge of the
panel.
— Do not place holes in a location that impedes access
to key maintenance components such as lters and
fan assemblies.
— Do not place holes in a location where the pipe will
block airow or obstruct hinged access doors.
• Once a proper location is determined:
— If no pipe chase cover is present:
a. Drill a small pilot hole completely through the
bottom cabinet panel, then using a sharp hole saw
or saber saw, cut the desired nal hole size and
smooth the edges of the cut. or saber saw, cut the
desired nal hole size and smooth the edges of the
cut.
— If a pipe chase cover is present:
a. Remove the pipe chase cover.
b. Drill a small pilot hole completely through the pipe
chase cover, then using a sharp hole saw or saber
saw, cut the desired nal hole size and smooth the
edges of the cut.
— After installation of the piping, seal the hole(s) in the
bottom cabinet panel or pipe chase cover.
a. Seal the holes to divert any moisture away from
the opening and prevent moisture leakage through
the holes.
b. Recommended sealing options include: ashing
material, caulk, spray foam, cork tape, industrial
or commercial grade silicone sealant, duct seal
compound, or other similar sealing material.
c. Pipe chase covers are not guaranteed to be
airtight or watertight, but the pipe chase cover
may be sealed in a similar manner to the other
penetrations of the pipe chase cover if desired.
The installer is responsible for ensuring the
penetrations are fully sealed.
Do not support piping o of the unit, or coil
connections.
It is extremely important to seal each hole or
penetration securely so that they are airtight and
watertight.
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