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Cancels: II 558F-90-3 II 558F-90-4
9/15/05
IMPORTANT — READ BEFORE INSTALLING
Read and become familiar with these installation instruc-
tions before installing this unit.
Be sure the installation conforms to all applicable local and
national codes.
These instructions contain important information for the
proper maintenance and repair of this equipment. Retain
these instructions for future use.
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-53
I. Step 1 — Provide Unit Support. . . . . . . . . . . . . . . . . 1
II. Step 2 — Field Fabricate Ductwork . . . . . . . . . . . . . 1
III. Step 3 — Install External Trap for
Condensate Drain. . . . . . . . . . . . . . . . . . . . . . . . . . 2
IV. Step 4 — Rig and Place Unit. . . . . . . . . . . . . . . . . . . 2
V. Step 5 — Make Electrical Connections . . . . . . . . . . 9
VI. Step 6 — Adjust Factory-Installed
Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
VII. Step 7 — Adjust Evaporator-Fan Speed . . . . . . . . 31
PRE-START-UP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54,55
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56-61
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . .61-65
INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . CL-1
SAFETY CONSIDERATIONS
Installation and servicing air-conditioning equipment can be
hazardous due to system pressure and electrical compo-
nents. Only trained and qualified service personnel should
install, repair, or service air-conditioning equipment.
Untrained personnel can perform basic maintenance func-
tions of cleaning coils and filters and replacing filters. All
other operations should be performed by trained service per-
sonnel. When working on air-conditioning equipment,
observe precautions in the literature, tags and labels
attached to the unit, and other safety precautions that may
apply.
Follow all safety codes. Wear safety glasses and work gloves.
Use quenching cloth for unbrazing operations. Have fire
extinguishers available for all brazing operations.
INSTALLATION
Unit is shipped in the vertical discharge configuration. To
convert to horizontal configuration, remove screws from hor-
izontal duct opening covers and remove covers. Using the
same screws, install covers on duct openings in basepan of
unit with the insulation-side down. Seals around duct open-
ings must be tight. See Fig. 1.
Confirm before installation of unit that voltage, amperage
and circuit protection requirements listed on unit data plate
agree with power supply provided.
I. STEP 1 — PROVIDE UNIT SUPPORT
A. Roof Curb
Assemble and install accessory roof curb in accordance with
instructions shipped with curb. See Fig. 2. Install insulation,
cant strips, roofing felt, and counter flashing as shown. Duct-
work must be attached to curb, not to unit. If electric control
power is to be routed through the basepan, attach the acces-
sory thru-the-bottom service connections to the roof curb in
accordance with the accessory installation instructions. Con-
nection must be installed before unit is set on roof curb.
IMPORTANT: 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. 2. Improperly applied gasket can
also result in air leaks and poor unit performance.
Curb should be level. This is necessary for unit drain to func-
tion properly. Unit leveling tolerances are shown in Fig. 3.
Refer to Accessory Roof Curb Installation Instructions for
additional information as required.
B. Alternate Unit Support
When the curb or adapter cannot be used, support unit with
sleeper rails using unit curb or adapter support area. If
sleepers cannot be used, support long sides of unit with a
minimum of three 4-in. x 4-in. pads, 2 at the unit’s corners
and one at the center of gravity. If more than 3 are used,
equally space out pads along unit side.
C. Slab Mount (Horizontal Units Only)
Provide a level concrete slab that extends a minimum of 6 in.
beyond unit cabinet. Install a 6-in. gravel apron in front of
outdoor-coil air inlet to prevent grass and foliage from
obstructing airflow.
NOTE: Horizontal units may be installed on a roof curb if
required.
II. STEP 2 — FIELD FABRICATE DUCTWORK
On vertical discharge units, secure all ducts to roof curb and
building structure. Do not connect ductwork to unit. For hori-
zontal applications, field-supplied isolation flanges should be
attached to horizontal discharge openings and all ductwork
attached to the flanges. Insulate and weatherproof all exter-
nal ductwork, joints, and roof openings with counter flashing
and mastic in accordance with applicable codes.
WARNING: Before performing service or mainte-
nance operations on unit, turn off main power switch
to unit and install lockout tag. Electrical shock could
cause personal injury.
CAUTION: Ensure voltage listed on unit data
plate agrees with electrical supply provided for the
unit.
installation, start-up and
service instructions
SINGLE PACKAGE ROOFTOP
ELECTRIC HEATING/ELECTRIC COOLING UNITS
558F
Dura
Pac
Series
Sizes 090-151
7
1
/
2
to 12
1
/
2
Tons