Table of Contents
Advertisement
Rooftop Installation
Rooftop platform requirements:
-- The unit MUST be situated to provide safe access for
servicing.
-- The existing roof structure MUST be adequate to sup-
port the weight of the unit or the roof MUST be
reinforced.
Check the weight of the unit in relation to the roof struc-
ture and local building codes or ordinances and
reinforce roof structure if necessary. See the last page
of this manual for unit weights.
-- Support for the unit MUST be level and strong enough
to carry unit weight. The support may consist of a plat-
form 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 of the unit and that the slings will not allow
the unit to shift.
Refer to on the back cover of this 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
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 2² (50.8mm) MUST be installed . Top of
3
/
² (19.1mm) female PVC
4
outlet from trap MUST be at least 1² (25.4mm) below top of
outlet from unit. Install the trap as near to the unit as
possible for proper drainage.
3
A
/
² (19.1mm) drain line MUST be installed if required by
4
local codes or if location of unit requires it. Run the drain line
to an open drain or other suitable disposal point.
Condensate Drain Information*
FIGURE 2
3
/
² (19.1mm)
4
Female PVC
Fitting
1²
(25.4mm)
2² (50.8mm)
* Condensate trap MUST be installed.
Electrical Wiring
Electrical shock hazard.
Disconnect power at fuse box or service panel
before making any electrical connections.
Unit MUST be grounded to electrical service pan-
el.
Failure to follow this warning can result in prop-
erty damage, personal injury, and/or death.
NOTE: All electrical work MUST conform with the require-
ments of local codes and ordinances and in the United
States with National Electrical Code ANSl/NFPA 70--1990
(or current edition) and in Canada with CSA C22.1 -- Cana-
dian Electrical Code Part 1 (or current edition). Provide line
voltage power supply from a separate fused circuit with a
disconnect switch (when required) located within sight of
the unit. Supply voltage, amperage, wire, fuse and discon-
nect switch sizes MUST conform with specifications in the
Parts List and on the unit rating plate.
Wiring MUST be protected from possible mechanical dam-
age and MUST NOT interfere with removal of access
panels, filters, etc.
3
/
² (19.1mm)
4
Drain Line
519 01 1102 00
5
Hide quick links:
Advertisement
Table of Contents
