Bryant Durapac Plus Series 551a - Manual

Cancels: II 551A-155-2 II 551A-155-3
3/1/01
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-17
I. Step 1 — Provide Unit Support. . . . . . . . . . . . . . . . . 1
II. Step 2 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . 1
III. Step 3 — Field Fabricate Ductwork . . . . . . . . . . . . . 7
IV. Step 4 — Make Unit Duct Connections . . . . . . . . . . .7
V. Step 5 — Trap Condensate Drain . . . . . . . . . . . . . . . 7
VI. Step 6 — Make Electrical Connections. . . . . . . . . . . . 8
VII. Step 7 — Make Outdoor-Air Inlet
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
VIII. Step 8 — Install Outdoor-Air Hood. . . . . . . . . . . . . 12
IX. Step 9 — Install All Accessories . . . . . . . . . . . . . . 15
X. Step 10 — Install Humidistat for Optional
Perfect Humidity™ Dehumidification Package . . 16
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18-25
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26-32
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . 33,34
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . CL-1
SAFETY CONSIDERATIONS
Installation and servicing of 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 supply
roof curb in accordance with instructions shipped with the
accessory. Accessory roof curb and horizontal supply roof
curb and information required to field fabricate a roof curb
or horizontal supply roof curb are shown in Fig. 1 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
horizontal supply roof curb is critical for a leakproof seal.
Install gasket supplied with the roof curb or horizontal sup-
ply roof curb as shown in Fig. 1. Improperly applied gasket
can result in air leaks and poor unit performance.
Roof curb must be level. This is necessary to permit unit
drain to function properly. Unit leveling tolerance is
± 1 /
16
in.
per linear ft in any direction. Refer to Accessory Roof Curb or
Horizontal Supply 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 addi-
tional information. 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 and 5).
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.
Electrical shock could cause personal injury.
installation, start-up and
service instructions
SINGLE PACKAGE ROOFTOP
ELECTRIC COOLING/ELECTRIC HEATING UNITS
551A
DuraPac Plus Series
Sizes 155-240