C. Slab Mount (Horizontal Units Only)
Provide a level concrete slab that extends a minimum of
6 in. beyond unit cabinet. Install a gravel apron in front of
outdoor-coil air inlet to prevent grass and foliage from ob-
structing airflow.
NOTE:
Horizontal units must be installed on accessory roof
curb or horizontal adapter. See Fig. 5, 8, and 9 for more
details.
II. UNIT DUCT CONNECTIONS
On vertical units, secure all ducts to roof curb and building
structure. Do not connect ductwork to unit. See Fig. 4. On
horizontal units, duct flanges should be attached to horizon-
tal openings and roof curb part no. 308450-203 or horizontal
adapter part no. 389210-201 must be used. All ductwork should
be secured to flanges. See Fig. 5, 8, and 9.
For concentric units, a concentric transition piece must be
field supplied and field fabricated to adapt the unit. See
Fig. 6 and 7.
If a plenum return is used on a vertical unit, the return should
be ducted through the roof deck to comply with applicable
fire codes.
A minimum clearance to combustibles of 1 in. for the first
24 in. of ductwork is required for all units with electric heat.
Cabinet return-air static shall not exceed −0.35 in. wg with
economizer or −0.45 in. wg without economizer. Refer to
Accessory Roof Curb Installation Instructions for more
details.
NOTE:
Connection must be made to roof curb before unit is
set in place.
III. RIG AND PLACE UNIT
Inspect unit for transportation damage. File any claim with
transportation agency. 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. 10
for additional information. Operating weight is shown in
Table 1.
Four rigging holes are provided in base rails as shown in
Fig. 10. Refer to rigging instructions on unit.
IMPORTANT:
Be sure to remove skids from under unit be-
fore setting unit in place.
A properly positioned unit will have the following clearances
between unit and roof curb:
1
⁄
4
-in. clearance between roof curb
and base rails on front, rear, and indoor air end of unit;
12-in. clearance between roof curb and compressor end of unit.
After unit is in position, remove polyethylene shipping wrap-
per and rigging skids.
IV. FIELD CONNECTIONS
A. Condensate Drain
See Fig. 11 for drain location. A
3
⁄
4
-in. half coupling is pro-
vided inside unit indoor-air section for condensate drain con-
nection. An 8
1
⁄
2
in. x
3
⁄
4
-in. diameter pipe nipple and a
2 in. x
3
⁄
4
-in. diameter pipe nipple coupled to a standard
3
⁄
4
-in. diameter elbow provides a straight path down through
holes in unit base rails (see Fig. 12). A trap at least 4 in. deep
must be used.
B. Field Duct Connections
NOTE:
The design and installation of the duct system must
be in accordance with NFPA standards for the installation of
nonresidence-type air-conditioning and ventilating systems,
NFPA No. 90A or residence-type, NFPA No. 90B, and/or
local codes and ordinances.
Adhere to the following criteria when selecting, sizing, and
installing the duct system:
1. Unit comes shipped for vertical supply and return. If unit
is installed in horizontal discharge application, remove
vertical return-air duct cover, and install block-off pan
shipped with accessory horizontal supply curb or adapter
on vertical return-air duct openings. If unit is installed
with concentric duct connections, a concentric transi-
tion piece must be field-supplied and field-fabricated to
adapt for concentric duct connections. See Fig. 6 and 7
for airflow patterns and suggested dimensions for the
concentric duct transition piece.
Fig. 9 — Dimensional Drawing — Horizontal Adapter Installation
NOTE: Part no. 389210-201 is a fully factory preassembled horizontal
adapter which includes an insulated high static regain transition duct
and substantially improves fan static performance.
—6—
Содержание 542J Series
Страница 28: ...Fig 33 Typical Label Diagram Schematic 542J180 208 230 V 60 Hz Unit Shown cont 28...
Страница 29: ...TROUBLESHOOTING CHART HEATING CYCLE ODT Outdoor Temperature 29...
Страница 30: ...TROUBLESHOOTING CHART COOLING CYCLE Copyright 1997 Carrier Corporation CATALOG NO BDP 3354 237...
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