Carrier 50FF 020 Installation, Operation And Maintenance Instructions page 14

7 - POSITIONING AND INSTALLATION
Handling
For transport and lifting up to the roof using a crane, a rocker arm
as well as approved slings, both suitable for the dimensions and
weight of the roofcurb, must be used. These slings will be hooked
on the eyebolts fi tted to the roofcurb.
Check that the eyebolts are perfectly screwed in before attaching
the slings.
Eyebolts
After the placing of the roofcurb, it is necessary to remove the
eyebolts. Put the eyebolts back in case of transport.
Note: All roofcurb are supplied with a return safety grille intended
for plenum installations. For installations with ducted return, the
grille must be removed prior to place the machine on the roofcurb.
Installation on the roof
The following picture shows the roofcurb elements that enable
adjusting and levelling it:
Adjusting angle pieces
The roofcurb will be supported on some joists placed for this
purpose in the roof (check the location of ducts for the air supply
and air return).
Joists
14
Safety grille
Reinforcing angle pieces
Joists
A
A
Slide the four adjustable angle pieces below the steel pan on top
of the joists.
The adjustable angle pieces are fi xed to the joists using self-
tapping screws or electric spot welding.
Tightening bolts
with blind rivet
nuts (M10)
Adjustable
angle piece
Check that the adjustable angle pieces are in the correct position
on the joists before the roofcurb is fi tted. Next, provisionally attach
the adjustable angle pieces to the joists with one or two self-tapping
screws per angle part.
Reinforcing angle piece
After the above operation remove the four reinforcing angle pieces
to position them in the roofcurb. Attach them to the roofcurb with
two screws without screwing them completely.
Tightening screws
Lay the roofcurb. The reinforcing angles prevent the roofcurb from
moving. The roofcurb should slide into the 4 adjusting angle pieces.
Important: Check that the roofcurb is installed in the
right direction.
50FF/FC A
roofcurb (mm) (mm)
020 to 047 1968 1485
052 to 052 2738
1934
070 to 093 3391 1934
100
50
Self-tapping screw
or spot weld
Joist
Joist
Reinforcing angle piece
B