11
POSITIONING ON CURB
For full perimeter curbs CRRFCURB072A00 and 073A00, the
clearance between the roof curb and the front and rear base rails
should be
1
/
4
-
in. (6.4 mm). The clearance between the curb and
the end base rails should be
1
/
2
-
in. (13 mm). For retrofit applica
-
tions with curbs CRRFCURB003A01 and 4A01, the unit should
be position as shown in Fig. 9. Maintain the 15
1
/
2
-in. (394 mm)
and 8
5
/
8
-in. (220 mm) clearances and allow the 22
5
/
16
-in.
(567 mm) dimension to float if necessary.
Fig. 9 — Retrofit Installation Dimensions
If the alternative condensate drain location through the bottom
of the unit is used in conjunction with a retrofit curb, the hole
in the curb must be moved 12
1
/
2
-in. (320 mm) towards the end
of the unit.
Although unit is weatherproof, guard against water from higher
level runoff and overhangs.
Remove all shipping materials and top skid. Remove extra cen
-
ter post from the condenser end of the unit so that the condens
-
er end of the unit matches Fig. 21-23. Recycle or dispose of all
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 op
-
tion may be field-converted to horizontal ducted configuration
using accessory CRDUCTCV001A00. To convert to horizontal
configuration, remove screws from side duct opening covers
(see Fig. 10) and remove covers. Discard the supply duct cov
-
er. Install accessory CRDUCTCV001A00 to cover the vertical
supply duct opening. Use the return duct cover removed from
the unit end panel to cover the vertical return duct opening.
Use the screws to install the covers on vertical duct openings
with the insulation-side down. The panels must be inserted into
the notches on the basepan to properly seal. The notches are
covered by the tape used to secure the insulation to the basepan
and are not easily seen. See Fig. 11 for position of the notches
in the basepan. Seals around duct openings must be tight. Se
-
cure with screws as shown in Fig. 12. Cover seams with foil
duct tape.
Field-supplied flanges should be attached to horizontal duct
openings and all ductwork should be secured to the flanges. In
-
sulate and weatherproof all external ductwork, joints, and roof
or building openings with counter flashing and mastic in accor
-
dance with applicable codes.
Do not cover or obscure visibility to the unit’s informative data
plate when insulating horizontal ductwork.
Fig. 10 — Horizontal Conversion Panels
Fig. 11 — Location of Notches
Fig. 12 — Horizontal Duct Panels In Place
REMOVABLE HORIZONTAL
SUPPLY DUCT OPENING COVER
REMOVABLE HORIZONTAL
RETURN DUCT OPENING COVER
BASEPAN
NOTCHES
NOTCHES
SCREWS
DUCT COVERS
SHEET METAL
FACE UP
BASEPAN
Содержание Legacy 549J 12 Series
Страница 4: ...4 Fig 2 Unit Dimensional Drawing Size 12 Units...
Страница 5: ...5 Fig 2 Unit Dimensional Drawing Size 12 Units cont...
Страница 9: ...9 Fig 6 Roof Curb Details REV 50TM500827...
Страница 24: ...24 Fig 42 Typical 549J Control Wiring Diagram...
Страница 25: ...25 Fig 43 Typical 549J Power Wiring Diagram 208 230 3 60 unit shown...
Страница 26: ...26 Fig 44 RTU Open Controller System Wiring Diagram...
