11
Step 6 — Rig and Place Unit
Keep unit upright and do not drop. Spreader bars are not
required if top crating is left on unit. Rollers may be used
to move unit across a roof. Level by using unit frame as a
reference. See Table 1 and Fig. 7 for additional information.
Lifting holes are provided in base rails as shown in Fig. 7.
Refer to rigging instructions on unit.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in
equipment damage.
All panels must be in place when rigging. Unit is not
designed for handling by fork truck.
CAUTION
!
Before setting the unit onto the curb, recheck gasketing on
curb.
PositioningonCurb—
Position unit on roof curb so that the following clearances
are maintained: 6.4 mm (
1
/
4
in.) clearance between the
roof curb and the base rail inside the front and back,
0.0 mm (0.0 in.). clearance between the roof curb and the
base rail inside on the duct end of the unit. This will result
in the distance between the roof curb and the base rail
inside on the condenser end of the unit being
approximately equal to section C--C in Figs. 4 and 5.
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
After unit is in position, remove rigging skids and
shipping materials.
Step 7 — Convert to Horizontal and Connect
Ductwork (when required)
Unit is shipped in the vertical duct configuration. Unit
without factory--installed economizer or return air smoke
detector option may be field--converted to horizontal ducted
configuration. To convert to horizontal configuration,
remove screws from side duct opening covers and remove
covers. Using the same screws, install covers on vertical
duct openings with the insulation--side down. Seals around
duct openings must be tight. See Fig. 8.
Field--supplied flanges should be attached to horizontal
duct openings and all ductwork should be secured to the
flanges. Insulate and weatherproof all external ductwork,
joints, and roof or building openings with counter flashing
and mastic in accordance with applicable codes.
Do not cover or obscure visibility to the unit’s informative
data plate when insulating horizontal ductwork.
C06108
Fig. 8 -- Horizontal Conversion Panels
Step 8 — Install Outside Air Hood
Economizer Hood Removal and Setup -- Factory
Option
1. The hood is shipped in knock--down form and
located in the return air compartment. It is attached
to the economizer using two plastic tie--wraps.
2. To gain access to the hood, remove the filter access
panel. (See Fig. 9.)
3. Locate and cut the (2) plastic tie--wraps, being
careful to not damage any wiring. (See Fig. 10.)
4. Carefully lift the hood assembly through the filter
access opening and assemble per the steps outlined
in Economizer Hood and Two–Position Hood on
page 12.
FILTER ACCESS PANEL
INDOOR COIL ACCESS PANEL
C06023
Fig. 9 -- Typical Access Panel Locations
50TC
