Installation Stages; Lifting With A Crane Or Forklift; Roof Curb And Rail Mounting; Recommended Roof Opening - Greenheck PVE-20 Installation, Operation And Maintenance Manual

Installation Stages

Once the PVe Heat Recovery Ventilator is delivered
to the jobsite, the actual installation occurs in several
distinct stages.
1. Installation location must be carefully considered.
Service clearances needed for later maintenance
of the unit must be taken into consideration,
access to Return Air and Discharge Air ducting
must be anticipated. And structural support
of the unit must be taken into consideration.
See appropriate sections of this manual for
further information. If electric wiring is going
to be brought into the cabinet from beneath
(recommended), preparations for that step must
be taken during the planning stage. If possible, a
GKD curb should be installed prior to installation
of roofing materials so that flashing can be run up
the sides of the curb.
2. Hoisting the cabinet can be accomplished with
either a crane or a fork lift. If a forklift is used, the
forks must extend all the way through the cabinet
and project from the far side. The forks should
be padded with a layer of ¼-inch thick plywood
or other suitable material. If a forklift is used, the
cabinet cannot be lowered directly onto the GKD
curb unit because the forks will be in the way. It
will be necessary to set the unit onto appropriate
dunnage for final lowering after the forks are
removed.
If a crane is used, hoisting points are provided at
each corner of the cabinet. Small, padded hooks
must be inserted into the hoisting points. There
is very little internal clearance inside the cabinet
base and the use of large lifting hooks will either
dig into the cabinet structure or else interfere with
the seating of the cabinet on the GKD curb.
2. Physical installation of the unit should be
completed prior to installation of electrical wiring.
Condensate drains should be connected and if
necessary, heat strips installed on the drains to
prevent freezing of the traps. A final check should
be made to ensure that the unit has been installed
level by using the bottom of the cabinet as a
reference, not the top (the cabinet roof is sloped
to the rear). Ensure that all ductwork has been
properly and permanently assembled.
3. Prior to wiring the unit, installer should verify that
all optional accessories are accounted for. Verify
that electric components such as motors are rated
properly for the voltage actually being used. Note
that some of the illustrations and pictures used in
this manual show the use of three phase power
and if the user actually has single phase power,
there will be minor variations present. The unit
should be wired according to the supplied wiring
diagrams and Best Practices. Careful testing
and balancing of the power source should be
accomplished at this time.
4
Model PVe Heat Recovery Unit
Lifting
Forklift lifting
Crane hoisting points
(typical)
Lifting with a Crane
1. Before lifting, be sure that all shipping material
has been removed from unit.
2. To assist in determining rigging requirements,
weights are shown below.
3. Unit must be lifted by simultaneously hoisting
at all four corner lifting points provided on base
structure, ensuring proper load distribution and
support at each corner.
4. Rigger to use suitable mating hardware to attach
to unit corner lifting points.
5. Spreader bar(s) must
span the unit to
prevent damage to
the cabinet by the lift
cables.
6. Always test-lift the
unit to check for
proper balance
and rigging before
hoisting to desired
location.
7. Never lift units by weatherhoods.
8. Never lift units in windy conditions.
9. Preparation of curb and roof openings should be
completed prior to lifting the unit and setting on
the curb.
The weights shown are a
worst case scenario based
on the sheet metal and
component weights for
the unit. These weights
include sheet metal weights
added together with the
largest motors, blowers and
accessories for the units.
Lifting with a Forklift
Unit base rail includes forklift lifting locations. Use
weights shown to determine forklift size requirements.
points
Unit Weights (lbs.)
Approx.
Model
Weight
PVe-20 1300
PVe-35 1600
PVe-45 2100
PVe-55 2700