Table of Contents
Advertisement
Step 2 — Plan for Sequence of Unit Installation
The support method used for this unit will dictate differ-
ent sequences for the steps of unit installation. For example,
on curb-mounted units, some accessories must be installed
on the unit before the unit is placed on the curb. Review the
following for recommended sequences for installation steps:
CURB-MOUNTED INSTALLATION
1.
Install curb
2.
Install field-fabricated ductwork inside curb
3.
Install accessory thru-base service connection package
(affects curb and unit) (refer to accessory installation
instructions for details)
4.
Prepare bottom condensate drain connection to suit
planned condensate line routing (refer to Step 10 —
Install External Condensate Trap and Line on page 12
for details)
5.
Rig and place unit
6.
Install outdoor air hood
7.
Install condensate line trap and piping
8.
Make electrical connections
9.
Install other accessories
PAD-MOUNTED INSTALLATION
1.
Prepare pad and unit supports
2.
Check and tighten the bottom condensate drain connec-
tion plug
3.
Rig and place unit
4.
Convert unit to side duct connection arrangement
5.
Install field-fabricated ductwork at unit duct openings
6.
Install outdoor air hood
7.
Install condensate line trap and piping
8.
Make electrical connections
9.
Install other accessories
FRAME-MOUNTED INSTALLATION
Frame-mounted applications generally follow the se-
quence for a curb installation. Adapt the sequence as re-
quired to suit specific installation plan.
Step 3 — Inspect Unit
Inspect unit for transportation damage. File any claim
with transportation agency.
Confirm before installation of unit that voltage, amper-
age and circuit protection requirements listed on unit data
plate agree with power supply provided.
On units with hinged panel option, check to be sure all
latches are snug and in closed position.
Locate the carton containing the outside air hood parts.
Do not remove carton until unit has been rigged and located
in final position.
Step 4 — Provide Unit Support
ROOF CURB MOUNT
Accessory roof curb details and dimensions are shown in
Fig. 4. Assemble and install accessory roof curb in accor-
dance with instructions shipped with the curb.
Curb should be level. This is necessary for unit drain to
function properly. Unit leveling tolerances are shown in
Fig. 5. Refer to Accessory Roof Curb Installation Instruc-
tions for additional information as required.
Install insulation, cant strips, roofing felt, and counter
flashing as shown. Ductwork must be attached to curb and
not to the unit. The accessory thru-the-base power connec-
tion package must be installed before the unit is set on the
roof curb.
If electric and control wiring is to be routed through the
basepan, attach the accessory thru-the-base service connec-
tions to the basepan in accordance with the accessory instal-
lation instructions.
NOTE: The gasketing of the unit to the roof curb is critical for
a watertight seal. Install gasket supplied with the roof curb as
shown in Fig. 4. Improperly applied gasket can also result in air
leaks and poor unit performance.
SLAB MOUNT (HORIZONTAL UNITS ONLY)
Provide a level concrete slab that extends a minimum of
6 in. (150 mm) beyond unit cabinet. Install a gravel apron in
front of condenser coil air inlet to prevent grass and foliage
from obstructing airflow.
NOTE: Horizontal units may be installed on a roof curb if re-
quired.
ALTERNATE UNIT SUPPORT (IN LIEU OF CURB OR
SLAB MOUNT)
A non-combustible sleeper rail can be used in the unit
curb support area. If sleeper rails cannot be used, support
the long sides of the unit with a minimum of 3 equally
spaced 4-in. x 4-in. (102 mm x 102 mm) pads on each side.
7
Advertisement
Table of Contents
