IOM / Rooftop Smart and Linéa™ Range - Page 15
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ROOF MOUNTING
NOTE : Some units are equipped with a blower bracket that
must be removed to install some accessories or when unit
is used in horizontal applications. However, this bracket does
not need to be removed unless it is necessary.
NOTE : Securely fasten roof frame to roof per local codes.
Downflow Application
1. The roof mounting frame must be installed, flashed and
sealed in accordance with the instructions provided with
the frame.
2. The roof mounting frame should be square and level
to 5 mm per linea metre in any direction.
3. Duct or duct enclosure must be attached to the roof
mounting frame and not to the SCA/SHA unit. Supply
and return air plenums must be installed before setting
the unit.
4. Place unit on frame according to roof mounting frame
instructions. Defrost drainage hole end of unit must
overhang roof mounting frame as described in figures
3 and 4.
5. Cut insulation away from overhang on bottom of units.
See shaded areas in figure 15.
Roof Mounting With Installer’s Frame
Many types of roof framing or supports can be used to install
the unit, depending upon different roof structures. Refer to
figure 16 for typical field fabricated mounting frame. Items
to keep in mind when building frame or supports are :
1. Frame must be shorter than cabinet length to allow for
76 mm overhang for defrost drainage holes.
2. Make sure the frame or supports are square, level and
not twisted.
3. Frame or supports must be high enough to prevent any
form of moisture from entering unit.
Recommended frame height is 356 mm
4. Install unit at least 102 mm above finished roof to allow
adequate drainage of water during defrost (SHA units).
5. Horizontal discharge units installed on roof require sup-
port along the longer sides of unit base. Support must
be constructed of steel or suitably treated wood
materials.
POSITION ON ROOF MOUNTING FRAME
SCA/SHA 010
SCA/SHA 013-015
Figure 14
Figure 15
Cut insulation away from overhang
on bottom of unit
76 to 85 mm
overhang
Defrost drainage
holes
Frame
outline
Unit outline
370 to 460 mm
overhang
Remove unit insulation from
overhang area
Frame outline
Unit outline
168 to 178 mm
overhang
Mounting frame
Defrost drainage
holes
Frame
angles
UNIT