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551J
Base Unit
Economizer
Vertical
Horizontal
Powered Outlet
Perfect Humidity™ System
Curb
14--- in./356 mm
24--- in./610 mm
1
Not available for size 11 units.
Curb- - mounted Installation —
Install curb
Install field- - fabricated ductwork inside curb
Install accessory thru- - base service connection package
(affects curb and unit) (refer to accessory installation
instructions for details)
Prepare bottom condensate drain connection to suit
planned condensate line routing (refer to Step 9 for
details)
Rig and place unit
Install outdoor air hood
Install condensate line trap and piping
Make electrical connections
Install other accessories
Pad- - mounted Installation —
Prepare pad and unit supports
Check and tighten the bottom condensate drain
connection plug
Rig and place unit
Convert unit to side duct connection arrangement
Install field- - fabricated ductwork at unit duct openings
Install outdoor air hood
Install condensate line trap and piping
Make electrical connections
Install other accessories
Frame- - mounted installation —
Frame- - mounted applications generally follow the
sequence for a curb installation. Adapt as required 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, amperage
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;
see Fig. 10. Do not remove carton until unit has been
rigged and located in final position.
Table 1 – Operating Weights
07
715 (324)
860 (390)
75 (34)
122 (55)
122 (55)
35 (16)
1
80 (36)
143 (65)
143 (65)
245 (111)
245 (111)
UNITS LB (KG)
08
09
860 (390)
75 (34)
75 (34)
122 (55)
35 (16)
35 (16)
80 (36)
80 (36)
143 (65)
245 (111)
Step 4 — Provide Unit Support
Roof Curb Mount —
Accessory roof curb details and dimensions are shown in
Fig. 6. Assemble and install accessory roof curb in
accordance with instructions shipped with the curb.
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. 6. Improperly applied
gasket can also result in air leaks and poor unit
performance.
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
Instructions for additional information as required.
Fig. 5 - - Unit Leveling Tolerances
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 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
connections to the basepan in accordance with the
accessory installation instructions.
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 required.
9
11/12
1025 (466)
75 (34)
122 (55)
35 (16)
85 (39)
143 (65)
245 (111)
MAXIMUM ALLOWABLE
DIFFERENCE IN. (MM)
A-B
B-C
A-C
0.5" (13)
1.0" (25)
1.0" (25)
a50--- 9658
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Troubleshooting
