Preva Installation/Service Manual, 00-02-1577, Revision E01
32
Installing the Control Unit on a Metal Stud Wall
Wall Plate and
Support Plate
Mounting Holes
The mounting template [30-S0003] is a guide for locating where to drill the holes
used to mount the wall plate and support plate to the wall. Carefully placing the
mounting template on the wall will help ensure correct installation of these plates
and, hence, of the Control Unit.
1. Using a stud finder, locate the center of the stud on which the Control Unit will
be mounted.
2. Place the mounting template for the dual stud mount on the wall with the lower
mounting holes 102 cm (40 in.) above the floor.
3. Place a level parallel to the vertical lines on the mounting template and adjust
the mounting template until it is plumb.
4. Tape the mounting template to the wall.
5. Using an awl or other sharp object, punch through the mounting template to
mark the location of the mounting holes.
6. Drill ¼-inch pilot holes at marked locations.
7. Drill 1-inch clearance holes.
8. Remove the mounting template from the wall and save for future use.
Stud Wall
Filler material is added to the wall to prevent the metal stud wall from being
crushed during installation.
1. Cut an access hole 15 cm × 25 cm (6 in. × 6 in.) in size between the clearance
holes.
2. Insert two 4x4 wooden studs in the access hole. Attach the studs to the rear
drywall surface with drywall screws.
The sheet metal stud wall must be sufficiently secure to hold
a load of 118 kg-m (850 ft-lb).
and Mounting
the Support
Plate (30-
A2043)
In the metal wall stud installation, the Control Unit is bolted to a wall plate (Figure
16) that has been installed to the support plate shown in Figure 17. The wall and
support plates are shipped in separate cartons from the Preva.
1. Put the small, then the larger washers and nut on each of the four carriage
bolts.
2. Insert the carriage bolts into the support plate holes.
3. Screw the threaded standoffs onto the carriage bolts with the slotted ends
away from the back plate.
4. Place the plastic sleeve bearings in the slotted ends of the carriage bolts.
5. Using a 5/32 Allen key, insert a set screw into each threaded standoff. Screw
the set screw until just below the slot in the threaded standoff, but do not
tighten.
6. Using two sheet metal screws mount and level the support plate through the
pilot holes on the back side of the wall. Tighten the sheet metal screws with the
screw driver.
7. On the front side of the wall, using a straight-blade screw driver, adjust the
threaded standoffs until the plastic part is flush with the drywall.
8. Tighten the set screws in the threaded standoffs to lock them in place.
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