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Cancels: II 581A-210-1 II 581A-210-2
10/1/05
installation, start-up and
service instructions
SINGLE PACKAGE ROOFTOP
ELEC TRIC COOLING/GAS HEATING UNITS
581A
Dura
Pac
Plus Series
Sizes 210-300
18 to 25 Tons
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-16
I. Step 1 — Provide Unit Support. . . . . . . . . . . . . . . . . 1
II. Step 2 — Remove Shipping Rails. . . . . . . . . . . . . . . 2
III. Step 3 — Rig and Place Unit. . . . . . . . . . . . . . . . . . . 2
IV. Step 4 — Field Fabricate Ductwork . . . . . . . . . . . . . 9
V. Step 5 — Make Unit Duct Connections . . . . . . . . . . 9
VI. Step 6 — Install Flue Hood and Inlet Hood . . . . . . 10
VII. Step 7 — Trap Condensate Drain . . . . . . . . . . . . . . 10
VIII. Step 8 — Install Gas Piping . . . . . . . . . . . . . . . . . . 10
IX. Step 9 — Make Electrical Connections . . . . . . . . . 11
X. Step 10 — Install Outdoor-Air Hood. . . . . . . . . . . . 12
XI. Step 11 — Position Optional Power
Exhaust or Barometric Relief Damper Hood . . . 16
XII. Step 12 — Non-Fused Disconnect . . . . . . . . . . . . . 16
XIII. Step 13 — Install All Accessories . . . . . . . . . . . . . 16
PRE-START-UP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17-36
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36-46
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . .47-51
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 the basic maintenance
functions of cleaning coils and filters and replacing filters.
All other operations should be performed by trained service
personnel. 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 temperature operat-
ing limits. If limits are exceeded, the units will automatically
lock the compressor out of operation. Manual reset will be
required to restart the compressor.
INSTALLATION
I. STEP 1 — PROVIDE UNIT SUPPORT
A. Roof Curb
Assemble or install accessory roof curb in accordance with
instructions shipped with this accessory. See Fig. 1. Install
insulation, cant strips, roofing, and counter flashing as
shown. Ductwork can be installed to roof curb before unit is
set in place. Ductwork must be attached to curb and not to
the unit. 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
Installation Instructions for additional information as
required. When accessory roof curb is used, unit may be
installed on class A, B, or C roof covering material. Bryant
roof curb accessories are for flat roofs or slab mounting.
WARNING: Before performing service or mainte-
nance operations on unit, turn off main power switch
to unit. Electrical shock could cause personal injury.
WARNING:
1. Improper installation, adjustment, alteration,
service, or maintenance can cause property
damage, personal injury, or loss of life. Refer to
the User’s Information Manual provided with
this unit for more details.
2. Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any
other appliance.
What to do if you smell gas:
1. DO NOT try to light any appliance.
2. DO NOT touch any electrical switch, or use any
phone in your building.
3. IMMEDIATELY call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
4. If you cannot reach your gas supplier, call the
fire department.
WARNING: Disconnect gas piping from unit when
pressure testing at pressure greater than 0.5 psig.
Pressures greater than 0.5 psig will cause gas valve
damage resulting in hazardous condition. If gas valve
is subjected to pressure greater than 0.5 psig, it must
be replaced before use. When pressure testing field-
supplied gas piping at pressures of 0.5 psig or less, a
unit connected to such piping must be isolated by clos-
ing the manual gas valve(s).