Rooftop Installation
Rooftop platform requirements:
- The unit MUST be situated to provide safe access for
servicing.
- The existing roof structure MUST be adequate to
support the weight of the unit or the roof MUST be
reinforced.
Check the weight of the unit in relation to the roof
structure and local building codes or ordinances and
reinforce roof structure if necessary. See page 11 ofthis
manual for unit weights.
- Support for the unit MUST be level and strong enough
to carry unit weight. The support may consist of a
platform or a combination of platform and roof beams or
curb.
- See Hoisting section for hoisting instructions.
HOISTING
NOTE: All access panels MUST be secured in place before
hoisting.
The unit should be hoisted with two lifting slings. Attach the
slings to rigging shackles that have been hooked through
holes in the base rail.
Two spreader bars MUST be placed on top of the unit to
protect the unit from damage from the pressure exerted by
the slings. Make sure that all equipment is adequate to
handle the weight ofthe unit and that the slings will not allow
the unit to shift.
Refer to FIGURE 9 on page 11 ofthis manual for illustrated
rigging instructions and weight chart.
DOWNFLOW CONVERSION
NOTE: In downflow applications with roof curbs or jack
stands, the center rail under the unit must be removed. The
center rail is attached to the base rail with screws.
These units are adaptable to downflow use. To convert to
downflow use, follow these steps:
1. Remove the blockoff plates found in the return air
compartment and the supply air compartment.
NOTE: Blockoff plate in the supply air compartment only
contains one screw. If reinstalling plate, back part of plate
MUST fit into mating dimples on flange. To reinstall, slant
plate into dimples, then put plate into position and fasten
with screw.
2. Install the removed plates on the horizontal return and
supply air openings.
3. Install roof curb on the building. Be sure to follow all
directions included with curb and all applicable building
codes in your installation.
Condensate Drain
The condensate drain outlet is a 3/4" (19.1 mm) female PVC
connection located at the bottom on the left hand side (see
FIGURE 2).
The circulating blower creates a negative pressure on the
condensate drain line that can prevent the condensate from
draining properly. To combat this negative pressure, a field
supplied condensate trap that will allow a standing column
of water of at least 2" (50.8mm) MUST be installed. Top of
outlet from trap MUST be at least 1" (25.4mm) below top of
outlet from unit. Install the trap as near to the unit as
possible for proper drainage.
A 3/4" (19.1 mm) drain line MUST be installed if required by
local codes or if location of unit requires it. Run the drain line
to an open drain or other suitable disposal point.
CondensateDrain,n,ormatlon*
3/4" (19.1mm)
Female PVC
Fitting _
(25.4mm)
(
2" (50,8ram)
\
80-31-32
3/4" (19.1mm)
Drain Line
* Condensate trap MUST be installed.
4. ELECTRICAL WIRING
ELECTRICAL SHOCK HAZARD.
Failure to follow this warning could result in personal
injury, death and/or property damage.
The unit cabinet must have an uninterrupted,
unbroken electrical ground to minimize the possibility
of serious injury if an electrical fault should occur.
This ground may consist of an electrical wire
connected to the unit ground lug in the control
compartment, or conduit approved for electrical
ground when installed in accordance with National
Electric Code (NEC) NFPA 70, and local electrical
codes. In Canada, follow Canadian Electrical Code
CSA (Canadian Standards Association) C22.1 and
local electrical codes.
141
To Next Page
Loading...
Need help?
General
