Cancels: New II 558F-180-1
6/15/02
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-20
I. Step 1 — Provide Unit Support. . . . . . . . . . . . . . . . . 1
II. Step 2 — Rig and Place Unit. . . . . . . . . . . . . . . . . . . 1
III. Step 3 — Field Fabricate Ductwork . . . . . . . . . . . . . 9
IV. Step 4 — Make Unit Duct Connections . . . . . . . . . . .9
V. Step 5 — Trap Condensate Drain . . . . . . . . . . . . . . . 9
VI. Step 6 — Make Electrical Connections. . . . . . . . . . . 10
VII. Step 7 — Make Outdoor-Air Inlet
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
VIII. Step 8 — Install Outdoor-Air Hood. . . . . . . . . . . . . 14
IX. Step 9 — Install All Accessories . . . . . . . . . . . . . . 17
X. Step 10 — Install Humidity Control
Accessory for Optional Perfect Humidity™
Dehumidification Package . . . . . . . . . . . . . . . . . . . 18
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20-26
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26-32
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . .33,34
INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
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.
IMPORTANT: Units have high ambient operating limits. If
limits are exceeded, the unit will automatically lock the com-
pressor out of operation. Manual reset will be required to
restart the compressor.
INSTALLATION
I. STEP 1 — PROVIDE UNIT SUPPORT
A. Roof Curb
Assemble and install accessory roof curb or horizontal
adapter roof curb in accordance with instructions shipped
with the curb or horizontal adapter. Accessory roof curb and
horizontal adapter roof curb and information required to
field fabricate a roof curb or horizontal adapter roof curb are
shown in Fig. 1A, 1B and 2. Install insulation, cant strips,
roofing, and counter flashing as shown. Ductwork can be
secured to roof curb before unit is set in place.
IMPORTANT: The gasketing of the unit to the roof curb or
adapter roof curb is critical for a leak-proof seal. Install
gasket supplied with the roof curb or adapter roof curb as
shown in Fig. 1A and 1B. Improperly applied gasket can
result in air leaks and poor unit performance.
Curb or adapter roof curb should be level. This is necessary
to permit unit drain to function properly. Unit leveling toler-
ance is ±
1
/
16
in. per linear ft in any direction. Refer to Acces-
sory Roof Curb or Horizontal Adapter Roof Curb Installation
Instructions for additional information as required.
B. Alternate Unit Support
When the curb or adapter cannot be used, support unit with
sleepers using unit curb or adapter support area. If sleepers
cannot be used, support long sides of unit with a minimum of
3 equally spaced 4-in. x 4-in. pads on each side.
II. STEP 2 — RIG AND PLACE UNIT
Inspect unit for transportation damage. File any claim with
transportation agency. Keep unit upright, and do not drop.
Use spreader bars over unit to prevent sling or cable dam-
age. Rollers may be used to move unit across a roof. Level by
using unit frame as a reference; leveling tolerance is ±
1
/
16
in.
per linear ft in any direction. See Fig. 3 for additional infor-
mation. Unit weight is shown in Table 1.
Four lifting holes are provided in ends of unit base rails as
shown in Fig. 3. Refer to rigging instructions on unit.
A. Positioning
Provide clearance around and above unit for airflow, safety,
and service access (Fig. 4-6).
Do not install unit in an indoor location. Do not locate air
inlets near exhaust vents or other sources of contaminated
air.
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
B. Roof Mount
Check building codes for weight distribution requirements.
WARNING: Before performing service or mainte-
nance operations on unit, turn off main power switch
to unit and install lockout tag on disconnect switch.
Electrical shock could cause personal injury.
installation, start-up and
service instructions
SINGLE PACKAGE ROOFTOP
ELECTRIC HEAT/ELECTRIC COOLING UNITS
558F
DuraPac Series
Sizes 180-300
15 to 25 Tons
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